1. The utility model provides a heating system, its characterized in that, heating system includes heating equipment, solar collector (2) and heat pump set (3), heating equipment solar collector (2) with heat pump set (3) are established ties in proper order and are formed with first heating circulation circuit, heating equipment with heat pump set (3) are connected and are formed with and not insert the second heating circulation circuit of solar collector (2), heating system still includes the switching unit, the switching unit can switch and switch on first heating circulation circuit with second heating circulation circuit.

2. The heating system according to claim 1, wherein the heating equipment, the solar thermal collector (2) and the heat pump unit (3) are sequentially connected in series along a medium flowing direction to form the first heating circulation loop, a bypass pipe (27) is arranged between a water outlet of the heating equipment and a water inlet of the heat pump unit (3), the switching unit comprises a bypass control valve (6) arranged on the bypass pipe (27), and the bypass control valve (6) is used for controlling the on-off of the bypass pipe (27).

3. A heating system according to claim 1 or 2, further comprising a first temperature detection device for detecting the temperature of water in a water tank in the solar collector (2), wherein the switching unit controls the first heating circulation loop to switch with the second heating circulation loop according to a first temperature value detected by the first temperature detection device.

4. A heating system according to claim 3, further comprising a second temperature detecting device for detecting the temperature of water flowing into the solar collector (2), wherein the switching unit controls the first heating cycle circuit and the second heating cycle circuit to be switched according to the detected temperature difference between the first temperature detecting device and the second temperature detecting device.

5. A heating system according to claim 2, wherein a buffer water tank (4) is connected in series to a communication pipeline between a water inlet of the heat pump unit (3) and a water outlet of the solar heat collector (2), and a water inlet of the buffer water tank (4) is higher than a water outlet of the buffer water tank (4).

6. A heating system according to claim 5, wherein the buffer tank (4) is provided with an external water inlet for external water use equipment;

a heat pump heat supply pipe (28) is communicated between a water outlet of the heat pump unit (3) and a water inlet of the buffer water tank (4), and a first control valve (29) for controlling the on-off of the heat pump heat supply pipe (28) is arranged on the heat pump heat supply pipe (28); and/or

A bypass water return pipe (30) is communicated between a water outlet of the buffer water tank (4) and a water inlet of the solar heat collector (2), and a bypass circulating pump (32) and a second control valve (31) for controlling the on-off of the bypass water return pipe (30) are arranged on the bypass water return pipe (30).

7. The heating system according to claim 6, wherein a first water level gauge is arranged in the solar heat collector (2) and used for detecting the water level of a water tank in the solar heat collector (2), the buffer water tank (4) is communicated with a water replenishing pipe (15), and the water replenishing pipe (15) replenishes water into the buffer water tank (4) according to the detection value of the first water level gauge; and/or

The water level meter is characterized in that a second water level meter is arranged in the buffer water tank (4), the second water level meter is used for detecting the water level in the buffer water tank (4), the buffer water tank (4) is communicated with a water replenishing pipe (15), and the water replenishing pipe (15) replenishes water in the buffer water tank (4) according to the detection value of the water level meter (26).

8. A heating system according to claim 6, characterised in that an electric heater (25) is arranged in the buffer tank (4).

9. A heating system according to claim 1 or 2, characterized in that the heating system further comprises:

the total heat meter (7) is used for detecting the heat energy consumed by water flowing through the heating equipment; and/or

And the heat-dividing meter (8) is used for detecting the heat energy increased after water flows through the heat pump unit (3).

10. A control method of a heating system, characterized in that a heating system according to any one of claims 1-9 is used, and that the control method comprises the steps of:

when the first heating circulation loop runs, if a set starting condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop;

when the second heating circulation loop operates, if a set closing condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop.

11. The control method according to claim 10, wherein the set activation condition is: the temperature difference between the water temperature of the water tank in the solar heat collector (2) and the water temperature of the water inlet of the solar heat collector (2) is larger than or equal to a first temperature value;

the set closing condition is as follows: the water temperature of the water tank in the solar heat collector (2) is less than or equal to a second temperature value, or the temperature difference between the water temperature of the water tank in the solar heat collector (2) and the water temperature of the water inlet of the solar heat collector (2) is less than or equal to a second temperature difference value;

the first temperature value-the second temperature value is not less than 5 ℃, and the first temperature difference value-the second temperature difference value is not less than 3 ℃.

Background

Indoor heating in winter in the north is usually realized by adopting centralized heating, and for rural areas or remote areas, the problems that a centralized heating network is difficult to build and difficult to cover comprehensively exist, so that heating of residents needs to be carried out by conventional heating equipment such as coal, an electric heater or a modified coal stove.

The modified coal stove is a device which is modified on the basis of the traditional coal stove, is added with a water tank, a circulating pipeline and a heating radiator, heats the water tank through the coal stove, and hot water enters the heating radiator through the circulating pipeline to exchange heat in a room so as to keep the temperature in the room in a constant temperature range. However, coal furnaces have great potential safety hazards, cannot work normally at night, cannot meet the requirement of room temperature, and can cause waste of coal resources and environmental pollution.

Therefore, an environmentally friendly and clean heating system and a control method thereof are needed to meet the heating requirement of residents in winter.

Disclosure of Invention

An object of the present invention is to provide a heating system to satisfy the heating demand of residents in winter and to improve the safety and reliability of heating.

Another object of the present invention is to provide a control method for a heating system to better meet the heating requirement in winter.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a heating system, heating system includes heating equipment, solar collector and heat pump set, heating equipment solar collector with heat pump set establishes ties in proper order and is formed with first heating circulation circuit, heating equipment with heat pump set connects to be formed with and does not insert solar collector's second heating circulation circuit, heating system still includes the switching unit, the switching unit can switch and switch on first heating circulation circuit with second heating circulation circuit.

As a preferred technical scheme of the heating system, the heating device, the solar thermal collector and the heat pump unit are sequentially connected in series along a medium flowing direction to form the first heating circulation loop, a bypass pipe is arranged between a water outlet of the heating device and a water inlet of the heat pump unit, the switching unit comprises a bypass control valve arranged on the bypass pipe, and the bypass control valve is used for controlling the on-off of the bypass pipe. Through with heating equipment, solar collector and heat pump set establish ties in proper order along fluid flow direction, can make the cold water that flows from heating equipment at first by the primary heating through solar collector, it is heated again through heat pump set, because the temperature that gets into solar collector is lower, the heat that can make full use of solar energy production heats water, improve the temperature that gets into the water in the heat pump set, reduce the energy loss of heat pump set, thereby be favorable to the energy saving more, guarantee heating system's efficiency.

As a preferred technical solution of the heating system, the heating system further includes a first temperature detection device, the first temperature detection device is configured to detect a temperature of water in a water tank in the solar thermal collector, and the switching unit controls the first heating circulation loop and the second heating circulation loop to switch according to a first temperature value detected by the first temperature detection device. The temperature of the water tank in the solar thermal collector is detected by setting the first temperature detection device, so that the solar heat collection effect of the solar thermal collector can be effectively judged, the controller can automatically judge whether the solar thermal collector can heat water or not, and the control automation of a heat supply system is improved.

As a preferable technical solution of the heating system, the heating system further includes a second temperature detection device, the second temperature detection device is configured to detect a temperature of water flowing into the solar thermal collector, and the switching unit controls the first heating circulation circuit and the second heating circulation circuit to be switched according to a detection temperature difference between the first temperature detection device and the second temperature detection device. When the temperature difference that first temperature-detecting device and second temperature-detecting device detected is great, it is better to the heating effect of the water that gets into inside to show solar collector, can realize the effective heating to the water in the heating circulation, and when the temperature difference that first temperature-detecting device and second temperature-detecting device detected was less, it is not big to show the temperature difference of the temperature of the water that flows into solar collector and the temperature after being heated by solar collector, and solar collector is difficult to effectively heat water. Whether the bypass control valve is opened or not is judged through the temperature difference detected by the first temperature detection device and the second temperature detection device, and the effectiveness of the solar heat collector in heating water can be guaranteed.

As a preferred technical scheme of a heating system, a buffer water tank is connected in series on a communicating pipeline between a water inlet of the heat pump unit and a water outlet of the solar thermal collector, and a water inlet of the buffer water tank is higher than a water outlet of the buffer water tank. Through setting up buffer tank, can guarantee the smooth and easy nature of fluid flow among the circulating line, avoid because the influence of external environment temperature or illumination intensity, the fluid flow that the fluid flow pressure sudden change that causes leads to is smooth, perhaps because phenomena such as the fluid cutout that the fluid evaporation leads to improve heating system's safety in utilization and use reliability.

As a preferred technical scheme of a heating system, the buffer water tank is provided with an external water gap used for externally connecting water using equipment;

a heat pump heat supply pipe is communicated between the water outlet of the heat pump unit and the water inlet of the buffer water tank, and a first control valve for controlling the on-off of the heat pump heat supply pipe is arranged on the heat pump heat supply pipe; and/or

And a bypass water return pipe is communicated between the water outlet of the buffer water tank and the water inlet of the solar heat collector, and a bypass circulating pump and a second control valve for controlling the on-off of the bypass water return pipe are arranged on the bypass water return pipe.

The setting of heat pump heating pipe and bypass wet return for heat pump set and the parallelly connected setting of solar collector, and can heat the water in the buffer water tank simultaneously, improve heating efficiency, effectively satisfy the domestic water demand to hot water.

As a preferred technical scheme of a heating system, a first water level gauge is arranged in the solar thermal collector and used for detecting the water level of a water tank in the solar thermal collector, the buffer water tank is communicated with a water replenishing pipe, and the water replenishing pipe replenishes water into the buffer water tank according to the detection value of the first water level gauge; and/or

And a second water level meter is arranged in the buffer water tank and used for detecting the water level in the buffer water tank, the buffer water tank is communicated with a water supplementing pipe, and the water supplementing pipe supplements water to the buffer water tank according to the detection value of the water level meter.

As a preferred technical scheme of a heating system, an electric heater is arranged in the buffer water tank.

As a preferable technical solution of the heating system, the heating system further includes:

a total heat meter for detecting heat energy consumed by water flowing through the heating device; and/or

And the heat-dividing meter is used for detecting the heat energy increased after water flows through the heat pump unit.

A control method of a heating system using the heating system as described above, and the control method comprising the steps of:

when the first heating circulation loop runs, if a set starting condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop;

when the second heating circulation loop operates, if a set closing condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop.

As a preferred technical solution of the heating system, the set starting condition is: the temperature difference between the water temperature of the water tank in the solar thermal collector and the water temperature of the water inlet of the solar thermal collector is larger than or equal to a first temperature value;

the set closing condition is as follows: the temperature difference between the water temperature of the water tank in the solar thermal collector and the water temperature of the water inlet of the solar thermal collector is smaller than or equal to a second temperature value;

the first temperature value-the second temperature value is not less than 5 ℃, and the first temperature difference value-the second temperature difference value is not less than 3 ℃.

The invention has the beneficial effects that:

according to the heating system provided by the invention, the solar thermal collector, the heat pump unit and the heating equipment are sequentially connected in series, so that when sunlight exists, the first heating circulation loop is conducted, namely the solar thermal collector and the heat pump unit are adopted to secondarily heat water flowing to the heating equipment, the problem of insufficient heat caused by heating the hot water by independently using the solar thermal collector or the heat pump unit in winter is solved, the heating temperature and the heating comfort are ensured, the loss of electric energy and coal resources can be effectively reduced, and the energy is saved; when no sunlight exists or the illumination is small, the first heating circulation loop is disconnected, the second heating circulation loop is connected, water in the heating equipment can be heated only through the heat pump unit, the heating system can be guaranteed to continuously and effectively heat, and the use reliability of the heating system is improved; moreover, the heat pump unit and the solar heat collector are adopted to heat water in the heating equipment, so that the environmental pollution is less, the energy cleanliness is higher, and the use safety of a heating system is improved.

The control method of the heating system provided by the invention can better meet the heating requirement in winter and improve the heating continuity and reliability.

Drawings

Fig. 1 is a schematic structural diagram of a heating system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a heating system according to a second embodiment of the present invention.

The figures are labeled as follows:

1. heating radiators; 2. a solar heat collector; 3. a heat pump unit; 4. a buffer water tank; 5. a circulation pump; 6. a bypass control valve; 7. a total heat meter; 8. a heat dividing meter; 9. a total electricity meter; 10. distributing meters; 11. a cold water return pipeline; 12. a water inlet pipe of the water tank; 13. a water outlet pipe of the water tank; 14. a hot water supply pipe; 15. a water replenishing pipe; 16. a first on-off valve; 17. a second on-off valve; 18. a third on-off valve; 19. a water pump; 20. a water inlet valve; 21. a filter; 22. a fourth switching valve; 23. a solar controller; 24. a heat pump controller; 25. an electric heater; 26. a second water gauge; 27. a bypass pipe; 28. a heat pump heating pipe; 29. a first control valve; 30. a bypass water return pipe; 31. a second control valve; 32. the circulation pump is bypassed.

In fig. 1, solid lines are pipes, dashed lines are circuits, and arrows indicate the fluid flow direction.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

As shown in fig. 1, the present embodiment provides a heating system, which can be applied to rural areas in the north where a central heating network is not covered, and can also be applied to other areas needing heating in the south, and the heating system provided by the present embodiment can be used in a residential family, and can also be applied to heating in other indoor environments such as a factory building and a school. The invention does not limit the application scene of the heating system.

Specifically, heating system includes heating equipment, solar collector 2 and heat pump set 3, and heating equipment, solar collector 2 and heat pump set 3 establish ties in proper order and are formed with first heating circulation circuit, and heating equipment and heat pump set 3 connect and are formed with the second heating circulation circuit that does not insert solar collector 2, and heating system still includes the switching unit, and the switching unit can switch over first heating circulation circuit and second heating circulation circuit.

That is, in the heating system provided in this embodiment, by adopting the series arrangement of the solar thermal collector 2, the heat pump unit 3 and the heating device, when sunlight exists, the first heating circulation loop is turned on, and the second heating circulation loop is turned off, that is, the solar thermal collector 2 and the heat pump unit 3 are adopted to secondarily heat water flowing to the heating device, so that the problem of insufficient heat caused by separately using the solar thermal collector 2 or separately using the heat pump unit 3 to heat hot water in winter is avoided, the heating temperature and the heating comfort are ensured, the loss of electric energy and coal resources can be effectively reduced, and energy is saved; when no sunlight or weak illumination exists, the first heating circulation loop is disconnected, the second heating circulation loop is connected, water in the heating equipment can be heated only by the heat pump unit 3, the heating system can be ensured to continuously and effectively heat, and the use reliability of the heating system is provided; moreover, the heat pump unit 3 and the solar heat collector 2 are adopted to heat water in the heating equipment, so that the environmental pollution is less, the energy cleanliness is higher, and the use safety of a heating system is improved.

In this embodiment, the heating device, the solar thermal collector 2 and the heat pump unit 3 are sequentially connected in series along the medium flowing direction to form the first heating circulation loop, a bypass pipe 27 is arranged between the water outlet of the heating device and the water inlet of the heat pump unit 3, the switching unit comprises a bypass control valve 6 arranged on the bypass pipe 27, and the bypass control valve 6 is used for controlling the on-off of the bypass pipe 27. The heating system further comprises a circulation pump 5 for facilitating the flow of fluid from the heat pump unit 3 to the heating device.

According to the arrangement, the solar thermal collector 2, the heat pump unit 3 and the heating equipment are sequentially connected in series along the flowing direction of the fluid, so that a first heating circulation loop for the fluid to flow is formed in the solar thermal collector 2, the heat pump unit 3 and the heating equipment; by arranging the bypass pipe 27 between the water outlet of the heating equipment and the water inlet of the heat pump unit 3, when the bypass pipe 27 is opened, because the resistance of the fluid flowing through the bypass pipe 27 is far less than the resistance of the fluid flowing through the solar thermal collector 2, the fluid flowing out of the heating equipment basically does not pass through the solar thermal collector 2 any more, but directly flows to the heat pump unit 3 through the bypass pipe 27, and therefore, the heat pump unit 3 and the heating equipment are connected in series to form a second heating circulation loop for the fluid to flow.

In this embodiment, through with heating equipment, solar collector 2 and heat pump set 3 establish ties in proper order along fluid flow direction, can make the cold water that flows from heating equipment at first through solar collector 2 by the primary heating, again through heat pump set 3 by the heating, because the temperature that gets into solar collector 2 is lower, the heat that can make full use of solar energy production heats water, improve the temperature that gets into the water in heat pump set 3, reduce heat pump set 3's energy loss, thereby be favorable to the energy can be saved more, guarantee heating system's efficiency.

It is understood that, in the present embodiment, when the bypass control valve 6 is opened, even though a portion of the piping connecting the inlet and outlet ends of the solar collector 2 is not blocked by the valve or the like, water no longer flows toward the solar collector 2 due to the influence of the fluid flow resistance, and thus the first heating circulation circuit is substantially in a disconnected state due to the flow resistance.

In the present embodiment, it is preferable that the bypass pipe 27 is automatically turned on and off by detecting the heat collecting condition and the heat supplying state of the solar collector 2, so that the automatic and intelligent control of the heat supplying system is realized. Specifically, heating system includes first temperature-detecting device and controller, and first temperature-detecting device sets up on solar collector 2 for detect the temperature in the inside water tank of solar collector 2, and the switching unit controls first heating circulation circuit and the switching of second heating circulation circuit according to the first temperature value that first temperature-detecting device detected. In this embodiment, specifically, the controller is connected to the first temperature detection device and the bypass control valve 6, and the controller controls the on/off of the bypass control valve 6 according to the first temperature value detected by the first temperature detection device.

Through setting for the temperature of first temperature-detecting device detection solar collector 2 internal water tank, can judge solar collector 2's solar energy collection effect effectively, make the controller can judge automatically whether solar collector 2 can carry out the condition of heating for water, improve the control automation to heating system: when the temperature of the water in the solar heat collector 2 is higher than or equal to the first temperature value, the solar heat collector 2 has effective heat supply capacity, so that the water can participate in heating of the water in the heating circulation loop; when the temperature of the water in the solar heat collector 2 is lower than the second temperature value, the current heat collecting effect of the solar heat collector 2 is poor, and the water flowing into the solar heat collector 2 cannot be heated, so that the solar heat collector 2 can participate in a heating cycle when the illumination is appropriate, the effective utilization of solar energy is ensured, and the loss of the heat pump unit 3 is reduced; when the illumination is insufficient, the solar heat collector 2 can be prevented from participating in heating circulation, and the energy loss of the solar heat collector 2 is reduced.

Further, the heating system further comprises a second temperature detection device, and the second temperature detection device is arranged on a cold water return pipeline 11 which is communicated with a water inlet of the solar heat collector 2 and a water outlet of the heating equipment and is used for detecting the temperature of water flowing into the solar heat collector 2. The controller can control the on-off of the bypass control valve 6, that is, the switching between the first heating circulation circuit and the second heating circulation circuit, according to the temperature difference detected by the first temperature detection device and the second temperature detection device.

When the temperature difference that first temperature-detecting device and second temperature-detecting device detected is great, it is better to the heating effect of the water that gets into inside to show solar collector 2, can realize the effective heating to the water in the heating circulation, and when the temperature difference that first temperature-detecting device and second temperature-detecting device detected was less, it is not big to show the temperature difference of the temperature of the water that flows into solar collector 2 and the temperature after being heated by solar collector 2, and solar collector 2 is difficult to effectively heat water. Whether bypass control valve 6 opens is judged through the difference in temperature that first temperature-detecting device and second temperature-detecting device detected, can guarantee the validity of solar collector 2 to the heating of water.

Preferably, the bypass control valve 6 that is closed is opened when a set opening condition is satisfied, and the controller controls the bypass control valve 6 to be automatically closed after the set closing condition is satisfied after the bypass control valve 6 is opened. Wherein, the starting conditions are set as follows: when the water temperature value detected by the first temperature detection device is greater than the first temperature value and the temperature difference value detected by the first temperature detection device and the second temperature detection device is greater than or equal to a first temperature difference value; the shut-down conditions were set as: when the water temperature value detected by the first temperature detection device is smaller than a second temperature value or the temperature difference value detected by the first temperature detection device and the second temperature detection device is smaller than or equal to a second temperature difference value; the first temperature value-the second temperature value is more than or equal to 5 ℃, and the first temperature difference value-the second temperature difference value is more than or equal to 3 ℃.

Above-mentioned setting, can further guarantee to participate in not only possessing the validity of solar energy collection to the solar collector 2 of heating equipment's heat supply circulation, still possess the validity to the water heating in the circulating line, avoid detecting in the solar collector 2 water tank temperature alone and judge the break-make of bypass control valve 6 and lead to can collect solar energy, nevertheless be difficult to effectively carry out the problem of heating to water, guarantee heating system's efficiency, reduce heating system's energy consumption. Meanwhile, when sunlight irradiates, the temperature of the sunlight keeps changing at any time, a certain time is needed for heating and cooling water in a water tank in the solar heat collector 2, a first temperature value-a second temperature value is set to be more than or equal to 5 ℃, and a first temperature difference value-a second temperature difference value is set to be more than or equal to 3 ℃, so that the bypass control valve 6 cannot be closed even if the temperature of the water in the water tank is slightly lower than the second temperature value in the operation process of the solar heat collector 2, frequent opening and closing of the bypass control valve 6 are avoided, the operation safety and reliability of a heat supply system are improved, the energy loss is reduced, and the utilization efficiency of the solar energy is ensured.

In this embodiment, the second temperature value is preferably 30 ℃ to 40 ℃, and the first temperature value is preferably 40 ℃ to 55 ℃. The first temperature difference value is 2-8 ℃, and the second temperature difference value is 8-15 ℃.

Preferably, a buffer water tank 4 is further connected in series on a communication pipeline between the water inlet of the heat pump unit 3 and the water outlet of the solar heat collector 2, and the water inlet of the buffer water tank 4 is higher than the water outlet of the buffer water tank 4. Through setting up buffer tank 4, can guarantee the smooth and easy nature of fluid flow in the circulating line, avoid because the influence of external environment temperature or illumination intensity, the fluid flow that the fluid flow pressure sudden change that causes leads to is not smooth, perhaps because phenomena such as the fluid cutout that the fluid evaporation leads to improve heating system's safety in utilization and use reliability.

In this embodiment, the heat pump unit 3 and the solar heat collector 2 are disposed on the roof, and the heating device and the buffer water tank 4 are disposed indoors. The water outlet of the heating equipment is communicated with the water inlet (water return port) of the solar heat collector 2 through a cold water return pipeline 11, the water outlet of the solar heat collector 2 is communicated with the water inlet of the buffer water tank 4 through a water tank water inlet pipe 12, the water outlet of the buffer water tank 4 is communicated with the water inlet of the heat pump unit 3 through a water tank water outlet pipe 13, and the water outlet of the heat pump unit 3 is communicated with the water inlet of the heating equipment through a hot water supply pipe 14.

Preferably, the bypass pipe 27 is connected between the cold return pipe 11 and the inlet of the buffer tank 4, thereby allowing the buffer tank 4 to be always located on the circulation line for heating, and at the same time, the length of the bypass pipe 27 can be shortened, thereby reducing the resistance of the fluid flowing to the bypass pipe 27, and thus reducing the amount of fluid flowing into the solar collector 2 when the bypass control valve 6 is opened.

In order to further improve the safety of the heating system, a first switch valve 16 is disposed on each of the cold water return pipeline 11 and the water tank inlet pipeline 12, the first switch valve 16 is a manual valve, and the first switch valve 16 is located above the bypass pipeline 27. The first switch valve 16 manually controls the on-off of the cold water return pipeline 11 and the water tank water inlet pipe 12 which are not connected into the second heating circulation loop, so that the solar heat collector 2 can be completely disconnected in the heating circulation loop, and the solar heat collector 2 is convenient to overhaul. And because first ooff valve 16 sets up in the top of bypass pipe 27, can make under the circumstances of second heating circulation circuit normal operating, overhaul solar collector 2, improve heating system's operation smoothness nature, security and reliability.

Both first switch valves 16 are normally open switch valves, and preferably, the first switch valve 16 located at the water inlet end of the solar collector 2 has a flow regulating function to regulate the amount of water entering the solar collector 2.

The circulation pump 5 is arranged on the water tank outlet pipe 13 to provide a large power for the extraction of water from the buffer tank 4, saving the power of the circulation pump 5, and preferably, the circulation pump 5 is arranged at a position close to the water outlet of the buffer tank 4.

In order to avoid water shortage in the buffer water tank 4, the buffer water tank 4 is communicated with a water supplementing pipe 15, and a water inlet valve 20 is arranged on the water supplementing pipe 15. The end of the water replenishing pipe 15 which is not connected with the buffer water tank 4 can be communicated with a tap, and the buffer water tank 4 is replenished with water through the tap. In order to improve the smoothness of water replenishing, the water replenishing pipe 15 is further provided with a water pump 19 for driving water to flow to the buffer water tank 4.

In this embodiment, the water replenishing pipe 15 is communicated with the water outlet pipe 13 of the water tank, and a connection point between the water replenishing pipe 15 and the water outlet pipe 13 of the water tank is located between the water outlet of the buffer water tank 4 and the circulating pump 5. This kind of setting can reduce the mouth of a river number of buffer tank 4, is favorable to guaranteeing buffer tank 4's sealed and thermal insulation performance. In other embodiments, the water replenishing pipe 15 may also be directly communicated with the buffer water tank 4.

Further, be provided with first fluviograph in solar collector 2, first fluviograph is used for detecting the water level of the inside water tank of solar collector 2, and surge tank 4 intercommunication has moisturizing pipe 15, and moisturizing pipe 15 is according to the detected value of first fluviograph to 4 internal moisturizing of surge tank. This kind of setting through the water level that detects the inside water tank of solar collector 2, realizes the moisturizing operation to buffer tank 4, can realize the automatic water feeding of solar collector 2, and avoids the water in solar collector 2 to spill over, improves solar collector 2's safety in utilization and reliability.

In another embodiment, a second water level meter is disposed in the buffer water tank 4, and the second water level meter is used for measuring the water level in the buffer water tank 4 and is electrically connected to the controller, so that the controller can replenish water into the buffer water tank 4 according to the water level in the buffer water tank 4. This kind of setting can avoid when adopting the heating of second heating circulating line, lack of water in heat pump set 3 or the second heating circulating line. Under this kind of setting, solar collector 2 also can realize automatic water feeding through buffer tank 4, also can adopt other pipelines to realize automatic water feeding.

Preferably, an electric heater 25 is provided in the buffer water tank 4, and the electric heater 25 may be used to heat the water in the buffer water tank 4. When the water in the buffer water tank 4 freezes because the ambient temperature is lower, or the heat pump unit 3 and the solar thermal collector 2 are inside or outside frozen, the water in the buffer water tank 4 can be heated by starting the electric heater 25, so that the heated water circulates and is introduced into the heat pump unit 3 and the solar thermal collector 2 to be iced. And the electric heater 25 can also participate in heat supply circulation when the heat efficiency of the air source heat pump and the solar heat collector 2 is low, so that hot water entering the heating equipment has enough heat, and the operation reliability and flexibility of the heat supply system are further ensured.

Preferably, the electric heater 25 is a heating pipe, which facilitates its arrangement in the buffer tank 4. Further, in order to reduce heat dissipation, the buffer water tank 4 is coated with an insulating layer, and the insulating layer can be made of, but not limited to, rock wool and other insulating materials.

The water tank inlet tube 12 is close to the water inlet of buffer tank 4 department and the water tank outlet pipe 13 is close to the water tank delivery port department of buffer tank 4 and all is provided with second ooff valve 17, the second ooff valve 17 of setting on water tank outlet pipe 13 is located between the access point of water tank delivery port and moisturizing pipe 15, second ooff valve 17 is manual valve, and the setting of second ooff valve 17, can be when buffer tank 4 inserts the circulation pipeline, perhaps when demolising among the circulation pipeline in the buffer tank 4, can not flow from the hydrologic cycle pipeline, make things convenient for the dismouting of buffer tank 4. Further, a filter 21 is arranged on the water outlet pipe 13 of the water tank, and the filter 21 is located between the circulating pump 5 and the access point of the water replenishing pipe 15 and used for filtering water flowing out of the buffer water tank 4, so that impurities such as rust and dust brought out of the buffer water tank 4 are prevented from entering the heat pump unit 3, and the operation safety of the heat supply system is improved.

In this embodiment, the controller includes a heat pump controller 24 and a solar controller 23 which are independently installed, the solar controller 23 is connected to the solar heat collector 2, the bypass control valve 6, the water inlet valve 20, and the like, and the heat pump controller 24 is connected to the circulation pump 5 and the heat pump unit 3. Through setting up heat pump controller 24 and solar controller 23, can realize the independent control to heat pump set 3 and solar collector 2, reduce the complexity of setting up of controller.

In order to better monitor the operation of the heating system, the heating system is also provided with a total heat meter 7 and a heat-dividing meter 8, the total heat meter 7 and the heat-dividing meter 8 are both arranged on a hot water supply pipe 14, and built-in flow meters thereof detect the flow on the hot water supply pipe 14; two temperature probes of the total heat meter 7 respectively detect water temperature at a water inlet and water temperature at a water outlet of the heating equipment, so that the total heat consumed by the heating equipment is obtained according to the temperature difference between the water temperature flowing into the heating equipment and the water temperature flowing out of the heating equipment and the flow value; the two temperature probes of the heat-dividing quantity meter 8 respectively detect the water inlet temperature and the water outlet temperature of the heat pump unit 3, and the built-in flow meter of the heat-dividing quantity meter 8 detects the flow of the hot water outlet pipe, so that the heat energy generated by the heat pump unit 3 is obtained by calculation according to the temperature difference between the water inlet temperature and the water outlet temperature of the heat pump unit 3 and the detected flow value, and the heat efficiency of the heating system can be clearly displayed; meanwhile, according to the difference between the total heat energy consumed by the heating equipment and the heat energy generated by the heat pump unit 3, the heat energy generated by the solar thermal collector 2 can be calculated, so that the effect of the solar thermal collector 2 is detected, and the operation of the heat pump unit 3 and the operation of the solar thermal collector 2 can be better controlled.

In order to detect the loss of the electric energy of the heat supply system, the heat supply system further comprises a total ammeter 9 and a sub ammeter 10, the total ammeter 9 is arranged on a power supply circuit of the heat pump unit 3 and used for calculating the total electric energy consumption of the heat pump unit 3, the sub ammeter 10 is arranged on a connecting circuit of the heat pump unit 3 and the circulating pump 5 and used for calculating the electric energy consumption of the circulating pump 5, and the difference between the total ammeter 9 and the sub ammeter 10 is the electric energy consumption of a compressor in the heat pump unit 3. The energy consumption and the thermal efficiency of the heat pump unit 3 can be calculated and obtained.

In the present embodiment, preferably, the heating device includes a plurality of radiators 1 arranged in parallel, and it can be understood that the arrangement positions and the number of the radiators 1 can be set according to the requirement. Furthermore, the inlet pipeline and the outlet pipeline of each radiator 1 are respectively provided with a third switch valve 18, and the arrangement of the third switch valves 18 can improve the convenience of disassembly, assembly and maintenance of each radiator 1. In each radiator 1, the third on-off valve 18 at the inlet is preferably a manually and electrically operated on-off valve compatible to control heating of the corresponding radiator, and the third on-off valve 18 at the outlet is preferably a manually operated on-off valve to reduce costs.

In this embodiment, the heat pump unit 3 is an air source heat pump, and the air source heat pump is an energy saving device which uses high-level energy to enable heat to flow from low-level heat source air to a high-level heat source, and can convert low-level heat energy (such as air, soil and heat contained in water) which cannot be directly used into high-level heat energy which can be used, so that the purpose of saving part of high-level heat energy (such as coal, gas, oil and electric energy) is achieved, energy is saved, emission is reduced, and the cost of a heat supply system is effectively reduced. The air source heat pump can adopt the existing mature finished product, and the invention does not limit the structure of the air source heat pump.

Further, in order to facilitate the disassembly, assembly and maintenance of the heat pump unit 3, a fourth switch valve 22 is disposed at a position of the water outlet pipe 13 close to the water inlet of the heat pump unit 3 and a position of the hot water supply pipe 14 close to the water outlet of the heat pump unit 3, and the fourth switch valve 22 is a manual switch valve.

Example two

As shown in fig. 2, the present embodiment provides a heating system, which is a further improvement of the heating system provided according to the first embodiment, so as to realize the heating requirement in winter, and at the same time, when the heating equipment is not needed for heating, realize the supply of hot water for domestic use, and improve the application range and application efficiency of the heating system.

In this embodiment, the buffer water tank 4 is provided with an external water port for externally connecting water-using equipment; a heat pump heat supply pipe 28 is communicated between the water outlet of the heat pump unit 3 and the water inlet of the buffer water tank 4, and a first control valve 29 for controlling the on-off of the heat pump heat supply pipe 28 is arranged on the heat pump heat supply pipe 28.

This kind of setting, when indoor need not carry out the heating, third ooff valve 18 on every radiator 1 all breaks off, and first control valve 29 is opened, and buffer tank 4 and heat pump set 3 establish ties the intercommunication and form the heat supply circulation, and rivers in the buffer tank 4 flow into heat pump set 3, and heat pump set 3 returns to in the buffer tank 4 after the heating to realize the heating to the water in the buffer tank 4. An external water gap in the buffer water tank 4 can be communicated with a domestic water pipeline to realize hot water supply to water consumption equipment.

Preferably, the water inlet of the buffer water tank 4 and the hot water supply pipe 14 are communicated between the buffer water tank 4 and the hot water supply pipe 14 through the heat pump heat supply pipe 28, so as to shorten the length of the heat pump heat supply pipe 28, simplify the pipe arrangement of the heat supply system, and reduce the cost of the heat supply system.

Furthermore, a bypass water return pipe 30 is communicated between the water outlet of the buffer water tank 4 and the water inlet of the solar heat collector 2, and a bypass circulating pump 32 and a second control valve 31 for controlling the on-off of the bypass water return pipe 30 are arranged on the bypass water return pipe 30. When heating is not needed indoors, the third switch valve 18 on each heating radiator 1 is disconnected, the bypass control valve 6 is disconnected, the solar thermal collector 2 and the buffer water tank 4 are directly connected in series and communicated through a pipeline, water flowing out of the buffer water tank 4 can flow through the solar thermal collector 2 to be heated and flows back to the buffer water tank 4, and therefore the solar thermal collector 2 heats water in the buffer water tank 4, and the heated water can be used for domestic water.

Preferably, the bottom of the buffer water tank 4 is provided with a first water outlet and a second water outlet, the first water outlet is communicated with a water tank outlet pipe 13, and a bypass return pipe 30 is communicated between the second water outlet and the cold return pipeline 11. By the arrangement, the length of the bypass water return pipe 30 can be shortened, so that the pipeline layout of the whole heating system is simplified, and the cost of the heating system is reduced.

The heat pump heating pipe 28 and the setting of bypass wet return 30 for heat pump set 3 and the parallelly connected setting of solar collector 2, and can heat the water in the buffer tank 4 simultaneously, improve heating efficiency, effectively satisfy the domestic aquatic to hydrothermal demand.

EXAMPLE III

The present embodiment provides a control method of a heating system, which uses the heating system in the first embodiment or the second embodiment, and the control method includes the steps of:

when the first heating circulation loop runs, if a set starting condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop;

when the second heating circulation loop runs, if the set closing condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop.

Preferably, the turn-on conditions are set as follows: the temperature of the water in the water tank of the solar heat collector 2 is greater than or equal to a first temperature value, and/or the temperature difference between the water temperature in the water tank of the solar heat collector 2 and the water temperature at the water inlet of the solar heat collector 2 is greater than or equal to a first temperature difference value;

the shut-down conditions were set as: the water temperature of the water tank in the solar heat collector 2 is less than or equal to a second temperature value, or the temperature difference between the water temperature of the water tank in the solar heat collector 2 and the water temperature of the water inlet of the solar heat collector 2 is less than or equal to a second temperature difference value;

the first temperature value-the second temperature value is more than or equal to 5 ℃, and the first temperature difference value-the second temperature difference value is more than or equal to 3 ℃.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.