1. A cold station, comprising:

a water chilling unit (4) comprising a condenser (41) and an evaporator (42);

a first fluid circulation assembly (1) forming a cooling water circulation path with the condenser (41);

a second fluid circulation assembly (2) forming a chilled water circulation path with the evaporator (42); and

a heat accumulation and release assembly (3) comprising a water tank (31), a first pipeline (32) and a second pipeline (33), the water tank (31) being configured to keep warm for water preset therein; both ends of the first pipe (32) are connected to the cooling water circulation path, respectively, a portion between both ends of the first pipe (32) is disposed in the tank (31), both ends of the second pipe (33) are connected to the chilled water circulation path, respectively, and a portion between both ends of the second pipe (33) is disposed in the tank (31);

wherein the heat accumulating and releasing assembly (3) is configured to absorb and store heat in the cooling water circulation path through the water tank (31) when the water chiller (4) is operating, and to release heat to at least one of the cooling water circulation path and the chilled water circulation path through the water tank (31) when the water chiller (4) is not operating.

2. Cold station according to claim 1, wherein the heat accumulating and releasing assembly (3) comprises a first on-off valve (34), said first on-off valve (34) being provided in the first conduit (32), said first on-off valve (34) being configured to open when the chiller (4) is operating and when the temperature inside the water tank (31) is lower than a first preset value, and to close when the temperature inside the water tank (31) is equal to or higher than the first preset value.

3. The cold station according to claim 2, wherein the first switching valve (34) is further configured to open when the temperature in the cooling water circulation path is below a second preset value and to close when the temperature in the cooling water circulation path is equal to or above the second preset value when the chiller (4) stops operating.

4. Cold station according to claim 1, wherein the heat accumulating and releasing assembly (3) further comprises a second on-off valve (35), the second on-off valve (35) being provided in the second conduit (33), the second on-off valve (35) being configured to be closed when the chiller (4) is in operation.

5. The cold station according to claim 4, wherein the second on-off valve (35) is further configured to open when the chiller (4) stops operating and when the temperature in the chilled water circulation path is below a second preset value and to close when the temperature in the chilled water circulation path is equal to or above the second preset value.

6. The cold station of claim 1,

the first fluid circulation assembly (1) comprises a first pump (11), the first pump (11) being configured to be turned on when the chiller (4) is running, to be turned on when the chiller (4) is stopped and when the temperature in the cooling water circulation path is lower than a second preset value, and to be turned off when the temperature in the cooling water circulation path is equal to or higher than the second preset value; and/or

The second fluid circulation assembly (2) comprises a second pump (21), the second pump (21) being configured to be turned on when the chiller (4) is running, to be turned on when the chiller (4) is not running, and to be turned on when the temperature in the chilled water circulation path is below a second preset value, and to be turned off when the temperature in the chilled water circulation path is equal to or above the second preset value.

7. The cold station of any of claims 1 to 6,

the first fluid circulation assembly (1) comprises a third on/off valve (12), the third on/off valve (12) is arranged between two junctions of the cooling water circulation path and the first pipeline (32), the third on/off valve (12) is configured to be opened when the water chiller (4) is operated, to be closed when the water chiller (4) is stopped and the temperature in the cooling water circulation path is lower than a second preset value, and to be opened when the temperature in the cooling water circulation path is equal to or higher than the second preset value; and/or

The second fluid circulation assembly (2) comprises a fourth switching valve (22), the fourth switching valve (22) being provided between two connections of the chilled water circulation path and the second pipe (33), the fourth switching valve (22) being configured to be opened when the chiller (4) is running, to be closed when the chiller (4) is not running and when the temperature in the chilled water circulation path is lower than a second preset value, and to be opened when the temperature in the chilled water circulation path is equal to or higher than the second preset value.

8. The cold station of claim 1,

the first fluid circulation assembly (1) comprises a third pipeline (13), a fourth pipeline (14) and a cooling tower (15), wherein the input end of the third pipeline (13) is connected to the condenser (41), the output end of the third pipeline (13) is connected to the cooling tower (15), the input end of the fourth pipeline (14) is connected to the cooling tower (15), and the output end of the fourth pipeline (14) is connected to the condenser (41); and/or

The second fluid circulation assembly (2) comprises a fifth pipeline (23), a sixth pipeline (24) and an end device (25), wherein the input end of the fifth pipeline (23) is connected to the evaporator (42), the output end of the fifth pipeline (23) is connected to the end device (25), the input end of the sixth pipeline (24) is connected to the end device (25), and the output end of the sixth pipeline (24) is connected to the evaporator (42).

9. A freezing prevention method of a cold station as claimed in any one of claims 1 to 8, comprising,

when the water chilling unit (4) runs, detecting the temperature in the water tank (31), and when the temperature in the water tank (31) is lower than a first preset value, absorbing and storing heat in a cooling water circulation path by the heat accumulating and releasing assembly (3) through the water tank (31);

when the water chilling unit (4) stops operating, the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are detected, and when the temperature in the chilled water circulation path and/or the cooling water circulation path is lower than a second preset value, heat is released to the chilled water circulation path and/or the cooling water circulation path through the heat accumulation and release assembly (3).

10. The anti-freezing method of a cold station of claim 9, further comprising: when the water chilling unit (4) operates, the temperature in the water tank (31) is detected, and when the temperature in the water tank (31) is equal to or higher than a first preset value, the heat storage and release component (3) stops absorbing and storing heat in a cooling water circulation path.

11. The anti-freezing method of a cold station of claim 9, further comprising: when the water chilling unit (4) stops operating, the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are detected, and when the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are both equal to or higher than a second preset value, the heat storage and release assembly (3) stops releasing heat to the chilled water circulation path and the cooling water circulation path.

Background

The integrated cold station is a cold supply product integrating pipeline components such as a water chilling unit, a water pump, a valve and the like into a container, and has the function of providing chilled water for the tail end. In cold regions, when the chiller unit stops working, the water in the system pipeline of the cold station has a freezing risk, and further the chiller unit can not be started to operate.

Disclosure of Invention

Some embodiments of the invention provide a cold station and an anti-freezing method thereof, which are used for relieving the problem of icing inside a pipeline.

In one aspect of the present invention, there is provided a cold station comprising:

the water chilling unit comprises a condenser and an evaporator;

a first fluid circulation assembly forming a cooling water circulation path with the condenser;

a second fluid circulation assembly forming a chilled water circulation path with the evaporator; and

the heat accumulating and releasing assembly comprises a water tank, a first pipeline and a second pipeline, wherein the water tank is configured to keep warm for water preset in the water tank; both ends of the first pipeline are respectively connected to the cooling water circulation path, a part of the first pipeline between both ends is arranged in the water tank, both ends of the second pipeline are respectively connected to the chilled water circulation path, and a part of the second pipeline between both ends is arranged in the water tank;

wherein the heat accumulating and releasing assembly is configured to absorb and store heat in the cooling water circulation path through the water tank when the water chilling unit is operated, and to release heat to at least one of the chilled water circulation path and the cooling water circulation path through the water tank when the water chilling unit is not operated.

In some embodiments, the heat storage and release assembly includes a first switch valve disposed on the first pipeline, the first switch valve being configured to open when the water chilling unit is operating and when the temperature in the water tank is below a first preset value, and to close when the temperature in the water tank is equal to or above the first preset value.

In some embodiments, the first switching valve is further configured to open when the temperature in the cooling water circulation path is lower than a second preset value and close when the temperature in the cooling water circulation path is equal to or higher than the second preset value when the chiller stops operating.

In some embodiments, the heat storage and release assembly further comprises a second on-off valve disposed in the second conduit, the second on-off valve configured to close when the chiller is operating.

In some embodiments, the second switching valve is further configured to open when the chiller stops operating and when the temperature in the chilled water circulation path is below a second preset value and to close when the temperature in the chilled water circulation path is equal to or above the second preset value.

In some embodiments of the present invention, the,

the first fluid circulation assembly includes a first pump configured to be turned on when the chiller is operating, turned on when the chiller is stopped, and turned on when the temperature in the cooling water circulation path is lower than a second preset value, and turned off when the temperature in the cooling water circulation path is equal to or higher than the second preset value; and/or

The second fluid circulation assembly includes a second pump configured to be turned on when the chiller is operating, turned on when the chiller is stopped, and turned on when the temperature in the chilled water circulation path is lower than a second preset value, and turned off when the temperature in the chilled water circulation path is equal to or higher than the second preset value.

In some embodiments of the present invention, the,

the first fluid circulation assembly includes a third on/off valve provided between two junctions of the cooling water circulation path and the first pipe, the third on/off valve being configured to be opened when the chiller is operating, to be closed when the chiller stops operating, and to be closed when the temperature in the cooling water circulation path is lower than a second preset value, and to be opened when the temperature in the cooling water circulation path is equal to or higher than the second preset value; and/or

The second fluid circulation assembly includes a fourth switching valve provided between two junctions of the chilled water circulation path and the second pipe, the fourth switching valve being configured to be opened when the chiller is operating, closed when the chiller is not operating, and when the temperature in the chilled water circulation path is lower than a second preset value, and opened when the temperature in the chilled water circulation path is equal to or higher than the second preset value.

In some embodiments of the present invention, the,

the first fluid circulation assembly comprises a third pipeline, a fourth pipeline and a cooling tower, wherein the input end of the third pipeline is connected to the condenser, the output end of the third pipeline is connected to the cooling tower, the input end of the fourth pipeline is connected to the cooling tower, and the output end of the fourth pipeline is connected to the condenser; and/or

The second fluid circulation assembly comprises a fifth pipeline, a sixth pipeline and a terminal device, wherein the input end of the fifth pipeline is connected to the evaporator, the output end of the fifth pipeline is connected to the terminal device, the input end of the sixth pipeline is connected to the terminal device, and the output end of the sixth pipeline is connected to the evaporator.

In one aspect of the present invention, there is provided an anti-freezing method of the above-described cold station, which comprises,

when the water chilling unit operates, detecting the temperature in the water tank, and when the temperature in the water tank is lower than a first preset value, absorbing and storing heat in a cooling water circulation path through the water tank by the heat accumulating and releasing assembly;

when the water chilling unit stops operating, the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are detected, and when the temperature in the chilled water circulation path and/or the cooling water circulation path is lower than a second preset value, heat is released to the chilled water circulation path and/or the cooling water circulation path through the heat storage and release assembly.

In some embodiments, the method of freeze protection of a cold station further comprises: when the water chilling unit operates, the temperature in the water tank is detected, and when the temperature in the water tank is equal to or higher than a first preset value, the heat storage and release component stops absorbing and storing heat in the cooling water circulation path.

In some embodiments, the method of freeze protection of a cold station further comprises: and when the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are both equal to or higher than a second preset value, the heat storage and release assembly stops releasing heat to the chilled water circulation path and the cooling water circulation path.

Based on the technical scheme, the invention at least has the following beneficial effects:

in some embodiments, the cold station includes a chiller, a first fluid circulation assembly, a second fluid circulation assembly, and a heat accumulating and releasing assembly that absorbs and stores heat from the cooling water circulation path through the water tank when the chiller is in operation; when the water chilling unit is shut down, the heat storage and release assembly releases heat to at least one pipeline of the chilled water circulation path and the cooling water circulation path through the water tank, and water in the pipeline is prevented from freezing. The water tank possesses the recovery heat to and the release heat prevents the effect that the pipeline freezes, makes the cold station need not to add extra firing equipment such as electric heating, just can avoid the cooling water set back that stops, and the freezing that pipeline inside working medium water leads to because of external low temperature environment influences makes the unable problem of operation of cooling water set, has energy-conserving effect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic illustration of a portion of a cold station provided in accordance with some embodiments of the present invention;

FIG. 2 is a schematic flow diagram of a cold station absorption heat storage according to some embodiments of the present invention;

FIG. 3 is a schematic flow diagram of cold station piping antifreeze provided in accordance with some embodiments of the present invention.

The reference numbers in the drawings illustrate the following:

1-a first fluid circulation assembly; 11-a first pump; 12-a third on/off valve; 13-a third line; 14-a fourth line; 15-a cooling tower; 16-a second temperature sensor;

2-a second fluid circulation assembly; 21-a second pump; 22-a fourth switching valve; 23-a fifth pipeline; 24-a sixth pipeline; 25-an end device; 26-a third temperature sensor;

3-heat storage and release component; 31-a water tank; 32-a first conduit; 33-a second line; 34-a first on-off valve; 35-a second on-off valve; 36-a first temperature sensor;

4-a water chilling unit; 41-a condenser; 42-evaporator.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the invention, its application, or uses. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

FIG. 1 is a schematic block diagram of some embodiments of a cold station according to the present invention. Referring to fig. 1, in some embodiments, a cold station includes a chiller 4, a first fluid circulation assembly 1, a second fluid circulation assembly 2, and a heat storage and release assembly 3.

The chiller 4 includes a condenser 41 and an evaporator 42. The water chiller 4 further includes a compressor (not shown in the figure) and the like. The connection of the compressor, the condenser 41 and the evaporator 42 in the chiller 4 is realized by the related art, and will not be described in detail herein.

The first fluid circulation assembly 1 and the condenser 41 form a cooling water circulation path.

The second fluid circulation assembly 2 forms a chilled water circulation path with the evaporator 42.

The heat accumulating and releasing module 3 includes a water tank 31, a first pipe 32, and a second pipe 33. The water tank 31 is configured to keep warm water preset therein. Both ends of the first pipe 32 are connected to the cooling water circulation path, and a part of the first pipe 32 between both ends is disposed in the tank 31. Both ends of the second pipe 33 are connected to the chilled water circulation path, respectively, and a part of the second pipe 33 between both ends is disposed in the tank 31.

Wherein the heat accumulating and releasing unit 3 is configured to absorb and store heat in the cooling water circulation path through the water tank 31 when the water chilling unit 4 is operated, and to release heat to at least one of the chilled water circulation path and the cooling water circulation path through the water tank 31 when the water chilling unit 4 is stopped from being operated.

That is, the heat accumulating and releasing unit 3 is configured to release heat to only the chilled water circulation path through the water tank 31, or to release heat to only the cooling water circulation path through the water tank 31, or to release heat to both the chilled water circulation path and the cooling water circulation path through the water tank 31 when the water chiller 4 stops operating.

When the water chiller 4 is operating, the heat accumulating and discharging unit 3 absorbs and stores heat in the cooling water circulation path through the water tank 31. When the water chilling unit 4 is stopped, the heat storage and release unit 3 may release heat only to the low-temperature pipe of the chilled water circulation path through the water tank 31, or may release heat to the chilled water circulation path and the low-temperature pipe of the cooling water circulation path at the same time, so as to prevent water inside the pipes from freezing. The water tank 31 has the internal heat of the recovery system, and releases the heat to prevent the pipeline from freezing, so that the cold station does not need to add additional heating equipment such as electric heating equipment, the problem that the water chilling unit 4 cannot run because of the influence of external low-temperature environment on the internal working medium water of the pipeline is frozen after the water chilling unit 4 stops working can be solved, and the energy-saving effect is achieved.

In some embodiments, the heat accumulating and releasing assembly 3 comprises a first on-off valve 34, the first on-off valve 34 is disposed on the first pipeline 32, and the first on-off valve 34 is configured to be opened when the water chilling unit 4 is in operation and the temperature in the water tank 31 is lower than a first preset value, and to be closed when the temperature in the water tank 31 is equal to or higher than the first preset value. Whether or not the water tank 31 absorbs heat in the stored cooling water circulation path is controlled by controlling the opening and closing of the first switching valve 34.

In some embodiments, the first switching valve 34 is further configured to be opened when the temperature in the cooling water circulation path is lower than a second preset value and to be closed when the temperature in the cooling water circulation path is equal to or higher than the second preset value when the operation of the chiller 4 is stopped. Whether or not the water tank 31 releases heat to the cooling water circulation path is controlled by controlling the opening and closing of the first opening and closing valve 34.

In some embodiments, the heat accumulating and releasing assembly 3 further comprises a second on-off valve 35, the second on-off valve 35 is provided on the second pipeline 33, and the second on-off valve 35 is configured to be closed when the water chiller 4 is in operation.

In some embodiments, the second switching valve 35 is further configured to be opened when the temperature in the chilled water circulation path is below a second preset value and to be closed when the temperature in the chilled water circulation path is equal to or higher than the second preset value when the operation of the chiller 4 is stopped. Whether the water tank 31 radiates heat to the chilled water circulation path is controlled by controlling the opening and closing of the second opening and closing valve 35.

In some embodiments, the first fluid circulation assembly 1 comprises a first pump 11, the first pump 11 being configured to be turned on when the chiller 4 is running, turned on when the chiller 4 is not running, and turned on when the temperature in the cooling water circulation path is below a second preset value, and turned off when the temperature in the cooling water circulation path is equal to or above the second preset value. The first pump 11 is used to provide power for flowing the cooling water in the cooling water circulation path.

In some embodiments, the second fluid circulation assembly 2 comprises a second pump 21, the second pump 21 being configured to be turned on when the chiller 4 is running, turned off when the chiller 4 is not running, and turned on when the temperature in the chilled water circulation path is below a second preset value, and turned off when the temperature in the chilled water circulation path is equal to or above the second preset value. The second pump 21 is used to provide power for flowing the chilled water in the chilled water circulation path.

In some embodiments, the first fluid circulation assembly 1 comprises a third on/off valve 12, the third on/off valve 12 being provided between two junctions of the cooling water circulation path and the first pipe 32, the third on/off valve 12 being configured to be opened when the chiller 4 is running, to be closed when the chiller 4 stops running, and to be closed when the temperature in the cooling water circulation path is lower than a second preset value, and to be opened when the temperature in the cooling water circulation path is equal to or higher than the second preset value.

In some embodiments, the second fluid circulation assembly 2 comprises a fourth switching valve 22, the fourth switching valve 22 being provided between two connections of the chilled water circulation path and the second pipe 33, the fourth switching valve 22 being configured to be opened when the chiller 4 is running, to be closed when the chiller 4 is not running, and to be opened when the temperature in the chilled water circulation path is lower than a second preset value, and to be opened when the temperature in the chilled water circulation path is equal to or higher than the second preset value.

In some embodiments, the first fluid circulation assembly 1 comprises a third line 13, a fourth line 14 and a cooling tower 15, the input of the third line 13 being connected to the condenser 41, the output of the third line 13 being connected to the cooling tower 15, the input of the fourth line 14 being connected to the cooling tower 15, the output of the fourth line 14 being connected to the condenser 41.

In the operation process of the water chilling unit 4, the temperature of the cooling water in the cooling water circulation path is high, when the temperature in the water tank 31 is lower than a first preset value, the cooling water in the cooling water circulation path flows through the water tank 31, the cooling water and the water in the water tank 31 carry out heat transfer, the heat storage and release component 3 absorbs and stores the heat in the cooling water circulation path through the water tank 31, in the process, the water in the water tank 31 is also utilized to carry out primary cooling on the cooling water in the cooling water circulation path, the temperature of the cooling water is reduced, the cooling water in the cooling water circulation path is cooled secondarily through the cooling tower 15, and the cooling water cooling efficiency is improved.

In the operation process of the water chilling unit 4, water discharged by the condenser 41 is firstly cooled through the water tank 31 for the first time, and then is cooled through the cooling tower 15 for the second time, so that the energy efficiency of the water chilling unit 4 is improved.

In some embodiments, the second fluid circulation assembly 2 includes a fifth pipe 23, a sixth pipe 24, and an end device 25, an input of the fifth pipe 23 is connected to the evaporator 42, an output of the fifth pipe 23 is connected to the end device 25, an input of the sixth pipe 24 is connected to the end device 25, and an output of the sixth pipe 24 is connected to the evaporator 42.

Some embodiments also provide an anti-freezing method of the cold station, which includes,

when the water chilling unit 4 is operated, the temperature in the water tank 31 is detected, and when the temperature in the water tank 31 is lower than a first preset value, the heat storage and release component 3 absorbs and stores the heat in the cooling water circulation path through the water in the water tank 31.

When the water chilling unit 4 stops operating, the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are detected, and when the temperature in the chilled water circulation path and/or the cooling water circulation path is lower than a second preset value, heat is released to the chilled water circulation path and/or the cooling water circulation path through the heat storage and release assembly 3.

The method specifically comprises the following steps: when only the temperature in the chilled water circulation path is lower than a second preset value, the heat storage and release assembly 3 only releases heat to the chilled water circulation path; or, when only the temperature in the cooling water circulation path is lower than the second preset value, the heat accumulating and releasing assembly 3 only releases heat to the cooling water circulation path; alternatively, when both the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are lower than the second preset value, the heat accumulation and release assembly 3 releases heat to the chilled water circulation path and the cooling water circulation path at the same time.

In some embodiments, the method of freeze protection of a cold station further comprises: when the water chilling unit 4 is operated, the temperature in the water tank 31 is detected, and when the temperature in the water tank 31 is equal to or higher than a first preset value, the heat accumulating and releasing component 3 stops absorbing the heat in the stored cooling water circulation path.

In some embodiments, the method of freeze protection of a cold station further comprises: when the water chilling unit 4 stops operating, the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are detected, and when the temperature in the cooling water circulation path and the temperature in the chilled water circulation path are both equal to or higher than a second preset value, the heat storage and release assembly 3 stops releasing heat to the chilled water circulation path and the cooling water circulation path.

As shown in fig. 1, in some preferred or alternative embodiments, the cold station includes a chiller 4, a first fluid circulation assembly 1, a second fluid circulation assembly 2, and a heat storage and release assembly 3.

The water chiller 4 includes a condenser 41, an evaporator 42, a compressor (not shown), and the like. The water chilling unit 4 is configured to form a refrigerant circulation path. The connection of the various components in the chiller 4 can be implemented by the related art, and will not be described in detail herein.

The first fluid circulation assembly 1 comprises a first pump 11, a third throttle valve 12, a third line 13, a fourth line 14, a cooling tower 15 and a second temperature sensor 16.

The input end of the third pipeline 13 is connected to the condenser 41, and the output end of the third pipeline 13 is connected to the cooling tower 15. The input of the fourth line 14 is connected to the cooling tower 15 and the output of the fourth line 14 is connected to the condenser 41. The first pump 11 is provided in the fourth line 14. A third throttle valve 12 and a second temperature sensor 16 are provided in the third line 13. A second temperature sensor 16 is located near the input of the third conduit 13 for sensing the temperature in the third conduit 13.

The second fluid circulation assembly 2 includes a second pump 21, a fourth switching valve 22, a fifth pipe 23, a sixth pipe 24, an end device 25, and a third temperature sensor 26.

The input of the fifth pipe 23 is connected to the evaporator 42 and the output of the fifth pipe 23 is connected to the end device 25. An input end of the sixth pipe 24 is connected to the end device 25, and an output end of the sixth pipe 24 is connected to the evaporator 42. The second pump 21 and the third temperature sensor 26 are provided in the sixth pipeline 24. A third temperature sensor 26 is located near the input of the sixth conduit 24 for sensing the temperature in the sixth conduit 24. A fourth throttle 22 is provided in the fifth line 23.

The heat accumulating and releasing assembly includes a water tank 31, a first pipe 32, a second pipe 33, a first switching valve 34, a second switching valve 35, and a first temperature sensor 36.

Both ends of the first pipe 32 are connected to the third pipe 13, respectively. The third throttle valve 12 is located between the two connections of the third line 13 to the first line 32. A portion between both ends of the first pipe 32 is provided in the water tank 31. A first on-off valve 34 is provided in the first conduit 32, the first on-off valve 34 being adjacent a first end of the first conduit 32, the first end of the first conduit 32 being upstream of a second end of the first conduit 32.

Both ends of the second pipe line 33 are connected to the fifth pipe line 23, respectively. The fourth switching valve 22 is located between two connections of the fifth line 23 and the second line 33. A portion between both ends of the second pipe line 33 is provided in the water tank 31. A second on-off valve 35 is provided in the second conduit 33, the second on-off valve 35 being adjacent a first end of the second conduit 33, the first end of the second conduit 33 being upstream of a second end of the second conduit 33.

The first temperature sensor 36 is provided in the water tank 31 for detecting the temperature inside the water tank 31.

When the water chiller 4 is in operation (see fig. 2):

the first pump 11 and the second pump 12 are started, the third switching valve 12 and the fourth switching valve 22 are opened, and the second switching valve 35 is closed.

The temperature T of the water tank 31 is detected by the first temperature sensor 36, and the temperature T of the water tank 31 is compared with a first preset temperature Ta. When the temperature T of the water tank 31 is lower than the first preset temperature Ta, the first switching valve 34 is opened, so that the cooling water in the third pipeline 13 in the cooling water circulation path passes through the first pipeline 32, exchanges heat with the water in the water tank 31 through the cooling water in the first pipeline 32, increases the temperature of the water in the water tank 31, and absorbs and stores heat through the water in the water tank 31. When the temperature T of the water tank 31 is equal to or greater than the first preset temperature Ta, the first switching valve 34 is closed.

When the water chiller 4 is shut down (refer to fig. 3):

the temperature T1 in the third pipe 13 in the cooling water circulation path is detected by the second temperature sensor 16, the temperature T2 in the sixth pipe 24 in the chilled water circulation path is detected by the third temperature sensor 26, and the temperatures T1, T2 are compared with the second preset temperature Tb.

When the temperature T1 and the temperature T2 are both lower than the second preset temperature Tb, the first switch valve 34, the second switch valve 35, the first pump 11, and the second pump 21 are turned on; the third switch valve 12 and the fourth switch valve 22 are closed; the first pump 11 and the second pump 21 provide power, so that cooling water in a cooling water circulation path circularly flows through the first pipeline 32, chilled water in the chilled water circulation path circularly flows through the second pipeline 22, the cooling water exchanges heat with water in the water tank 31 in the first pipeline 32, and the chilled water exchanges heat with the water in the water tank 31 in the second pipeline 33, thereby realizing heat release of the water tank 31, improving the temperature in the cooling water circulation path and the chilled water circulation path, and preventing pipelines from freezing.

When the temperature T1 and the temperature T2 are both equal to or higher than the second preset temperature Tb, the third and fourth switching valves 12 and 22 are opened, and the first and second switching valves 34 and 35, the first and second pumps 11 and 21 are closed.

When one of the temperature T1 and the temperature T2 is lower than the second preset temperature Tb, the temperature T1 is generally equal to or higher than the second preset temperature Tb, and the temperature T2 is lower than the second preset temperature Tb, at this time, the second switch valve 35 and the second pump 21 are turned on; the fourth switching valve 22 is closed; the chilled water in the chilled water circulation path flows in a circulating manner through the second pipeline 22, and the chilled water exchanges heat with water in the water tank 31 in the second pipeline 33, so that heat release of the water tank 31 is realized, the temperature in the chilled water circulation path is increased, and the pipeline is prevented from freezing. In the above process, the first pump 11, the first on-off valve 34, and the third on-off valve 12 are closed.

After cooling water set 4 stops, because ambient temperature is lower can cause the pipeline to freeze, and water tank 31 has the heat preservation function, can make the water in the water tank 31 keep the temperature, consequently, after cooling water set 4 stops, can prevent that the pipeline from freezing through the temperature in heat release promotion cooling water circulation route and the refrigerated water circulation route of water tank 31.

The second preset temperature Tb is selected based on the freezing temperature of the pipeline. The second predetermined temperature Tb is generally greater than the pipeline freezing temperature and less than the temperature within the tank 31.

The first preset temperature Ta is lower than the temperature of the cooling water coming out of the condenser 41 when the chiller 4 is operating. The first preset temperature Ta is greater than the second preset temperature Tb.

In some embodiments, when the chiller 4 is in operation, the temperature of the cooling water discharged from the condenser 41 is high, and when passing through the water tank 31, the water in the water tank 31 can be heated, and since the water tank 31 has a heat retaining function, the heat in the circulation path of the cooling water can be recovered and stored. When the water chilling unit 4 is stopped, if the environmental temperature is low and the pipeline is frozen, the heat stored in the water tank 31 can be used for heating the cooling water circulation path and the chilled water circulation path, so that the pipeline is prevented from freezing; and other auxiliary equipment is not required to be added for additional heat supply, and the energy-saving and emission-reducing beneficial effects are achieved.

Based on the embodiments of the invention described above, the technical features of one of the embodiments can be advantageously combined with one or more other embodiments without explicit negatives.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.