1. The air inlet pipe is characterized by comprising an air inlet pipe body (1), wherein the air inlet pipe body (1) is provided with a conical pipe section (11), an outlet (12) of the air inlet pipe body (1) is located on the small-diameter bottom surface of the conical pipe section (11), a plurality of first air vents (13) are formed in the conical pipe section (11), and the first air vents (13) penetrate through the inner side and the outer side of the conical pipe section (11).

2. The intake duct according to claim 1, characterized in that the plurality of first ventilation holes (13) have an increasingly larger aperture in the direction of flow of the airflow in the intake duct body (1).

3. The intake pipe according to claim 1 or 2, wherein the outer peripheral side of the tapered pipe section (11) is provided with a secondary separation member capable of secondarily separating the fluid flowing out of the first vent hole (13).

4. The air inlet pipe according to claim 3, characterized in that the secondary separating element is a guide shell (2), and a plane passing through the central axis of the conical pipe section (11) and any generatrix is a first axial cross section, and on the first axial cross section, the diameter of the guide shell (2) is gradually increased along the flowing direction of the air flow in the air inlet pipe body (1).

5. The air inlet pipe according to claim 4, characterized in that the secondary separating part is a guide shell (2), the guide shell (2) is provided with a connecting section (21) connected with the conical pipe section (11) and a guide section (22) arranged on the periphery of the connecting section (21) in the first axial section, a bending angle is formed between the guide section (22) and the connecting section (21), and one end of the guide shell (2) far away from the connecting section (21) is provided with a port.

6. The intake pipe according to claim 5, characterized in that the connection section (21) is configured with a plurality of second venting holes (211).

7. The air inlet pipe according to claim 5, characterized in that a plurality of third venting holes (221) are configured on the flow guide section (22).

8. The air inlet pipe according to claim 6 or 7, characterized in that a liquid separating plate (3) is connected to the port, and a plurality of liquid passing holes (31) are formed in the liquid separating plate (3).

9. The air inlet pipe according to claim 8, wherein the liquid separation plate (3) is connected with the outlet (12), and the liquid passing holes (31) comprise a first liquid passing hole (311) opposite to the outlet (12) and a plurality of second liquid passing holes (312) arranged around the first liquid passing hole (311); and/or the aperture of the liquid passing holes (31) is smaller and smaller from inside to outside along the radial direction of the liquid separation plate (3).

10. A shell-and-tube condenser, characterized by comprising a shell (100), wherein the shell (100) is provided with an air inlet tube (103) according to any one of claims 1 to 9.

11. The shell-and-tube condenser according to claim 10, wherein an oil filter screen (101) and an oil baffle plate (102) located in a lower region of the oil filter screen (101) are further provided in the shell (100), an oil filtering space is formed between the oil filter screen (101) and the oil baffle plate (102), and the refrigerant fluid filtered by the intake pipe (103) can enter the oil filtering space.

12. An air conditioner characterized by comprising the shell-and-tube condenser according to claim 10 or 11.

Background

The horizontal shell-and-tube condenser is one of four key parts of a refrigerating unit and has the function of condensing high-temperature and high-pressure gaseous refrigerant discharged by a compressor into high-pressure and medium-temperature liquid refrigerant in a refrigerating cycle. In the actual operation of the unit, the high-temperature and high-pressure gaseous refrigerant discharged by the screw compressor carries part of the compressor refrigeration oil particles to enter the condenser. If the part of the refrigeration oil is accumulated in the condenser or enters the evaporator along with the circulating medium for accumulation, the heat exchange capacity of the two devices is reduced, the compressor is damaged due to lack of refrigeration oil lubrication, and finally the system cannot be continuously and safely operated.

In order to solve the problem of separation of the refrigerant oil and ensure continuous and safe operation of the system, an oil separator is adopted to separate oil from gas of fluid discharged by a compressor, the separated high-purity gaseous refrigerant enters a condenser, and liquid refrigerant oil returns to the compressor by utilizing a differential pressure effect. In order to maintain high oil-gas separation efficiency, the oil separation structure needs to be optimized and improved.

The oil separator plays an indispensable role in the stability of the commercial screw machine set, and the common oil categories include vertical external oil, horizontal external oil and horizontal internal oil. The horizontal built-in oil has larger development space, and plays an important role in simplifying the appearance of the unit, saving the space and the like.

In practical application, the oil separator is usually connected with an outlet of a compressor, a high-temperature and high-pressure gas-liquid mixture is treated by the oil separator, the particle size distribution of liquid-phase oil drops is wide, most of the liquid-phase oil drops are within the range of 1-50 mu m, a small part of the liquid-phase oil drops are only 0.01 mu m, and meanwhile, a small part of lubricating oil exists in a gas phase mode, so that the separation difficulty is high.

In addition, refrigeration air conditioning systems place higher demands on the separation efficiency of the separator relative to other industries. Therefore, the separation effect is not ideal when a single separation method is used. The oil drops with larger diameters are separated by adopting a mode of combining a plurality of separation methods, such as a centrifugal separation method and the like, and the oil drops with small particle sizes are separated by utilizing a coalescence separation method, so that a better separation effect can be achieved.

Therefore, various separation methods are comprehensively applied, and the separation method is properly applied, so that the improvement of the separation effect is greatly influenced.

Research finds that large oil drops are most easily separated after an oil-gas mixture (refrigerant) enters oil, but if the structural design of a separation area is improper, the large oil drops are damaged and collected, the large oil drops are changed into countless small oil drops after collision, a large amount of entrainment phenomenon occurs in a flow field, the burden of an oil drop separation of an oil filter screen is increased, and then the oil separation efficiency is influenced and the system resistance loss is increased.

As shown in fig. 9 and 10, which are simple structures of a built-in oil component in the related art, after a gaseous refrigerant with oil enters a built-in oil component space from a top air inlet (through an air inlet pipe 200) to be dispersed, a part of large oil droplets first flows downwards to the bottom under the action of gravity to enter an oil return area, most of the large oil droplets are blown up with an air flow and impact on a liquid baffle 202 to separate a part of oil droplets, and the remaining small oil droplets continue to enter the oil component space with the air flow bypassing the liquid baffle 202. In the flowing process, under the action of gravity and inertia force, the gaseous refrigerant flows towards the oil separation filter screen 201, the speed of the small-particle oil drops is gradually reduced in the flowing process, and finally the small-particle oil drops are settled on the oil baffle plate 202 with the holes. In the operation process of the small-cooling-capacity unit, the structure has the advantages of simple form, small pressure loss, small vibration and the like, but the structure has the advantages of low space utilization rate in size, narrow oil content application range, unstable oil separation capacity and large fluctuation of air flow for the unit with variable working conditions.

Disclosure of Invention

Therefore, the invention provides an air inlet pipe, a shell-and-tube condenser and an air conditioner, which can overcome the defects that the oil separation capability of the built-in oil separation structure of the shell-and-tube condenser in the related art is unstable, and the oil separation effect is greatly influenced by airflow fluctuation.

In order to solve the above problems, the present invention provides an air intake pipe, including an air intake pipe body, the air intake pipe body has a tapered pipe section, an outlet of the air intake pipe body is located on a small diameter bottom surface of the tapered pipe section, the tapered pipe section is configured with a plurality of first air vents, and the first air vents penetrate through the inner and outer sides of the tapered pipe section.

Preferably, the aperture of the first ventilation holes is larger along the flowing direction of the air flow in the air inlet pipe body.

Preferably, the tapered pipe section is provided with a secondary separation member on the outer peripheral side, and the secondary separation member is capable of performing secondary separation on the fluid flowing out of the first vent hole.

Preferably, the secondary separating part is a guide shell, a plane passing through the central axis of the conical pipe section and any generatrix is a first axial section, and the diameter of the guide shell is gradually increased along the flowing direction of the air flow in the air inlet pipe body on the first axial section.

Preferably, the secondary separating part is a guide shell, the guide shell is provided with a connecting section connected with the conical pipe section and a guide section located on the periphery of the connecting section on the first axial section, a bending angle is formed between the guide section and the connecting section, and a port is formed in one end, far away from the connecting section, of the guide shell.

Preferably, a plurality of second ventilation holes are formed on the connecting section.

Preferably, a plurality of third venting holes are formed in the flow guide section.

Preferably, a liquid separation plate is connected to the port, and a plurality of liquid passing holes are formed in the liquid separation plate.

Preferably, the liquid separation plate is connected with the outlet, and the liquid passing holes comprise a first liquid passing hole opposite to the outlet and a plurality of second liquid passing holes arranged around the first liquid passing hole; and/or the aperture of the liquid passing holes is smaller and smaller from inside to outside along the radial direction of the liquid separation plate.

The invention also provides a shell-and-tube condenser which comprises a shell, wherein the shell is provided with the air inlet pipe.

Preferably, an oil separation filter screen and an oil baffle plate located in a lower area of the oil separation filter screen are further arranged in the shell, an oil filtering space is formed between the oil separation filter screen and the oil baffle plate, and refrigerant fluid filtered by the air inlet pipe can enter the oil filtering space.

The invention also provides an air conditioner which comprises the shell-and-tube condenser.

According to the air inlet pipe, the shell-and-tube condenser and the air conditioner, oil drops in a refrigerant airflow with oil can be preliminarily filtered when the refrigerant airflow enters the air inlet pipe, large oil drops in the refrigerant airflow can be collected in advance through the conical structure of the conical pipe section, the small oil drops can be collected again, and the oil separation capacity and the oil separation efficiency are effectively improved.

Drawings

Fig. 1 is a schematic structural view (axial section) of an intake pipe of an embodiment of the present invention;

fig. 2 is a schematic structural view (axial section) of an intake pipe according to another embodiment of the present invention;

fig. 3 is a schematic structural view (axial section) of an intake pipe according to still another embodiment of the present invention;

fig. 4 is a schematic structural view (axial section) of an intake pipe according to still another embodiment of the present invention;

fig. 5 is a schematic view of the internal structure of a shell-and-tube condenser according to an embodiment of the present invention;

fig. 6 is a schematic view of the internal structure of a shell-and-tube condenser according to another embodiment of the present invention;

fig. 7 is a schematic view of the internal structure of a shell-and-tube condenser according to still another embodiment of the present invention;

fig. 8 is a schematic view of the internal structure of a shell-and-tube condenser according to still another embodiment of the present invention;

fig. 9 is a schematic view of the internal structure of a shell-and-tube condenser in the related art;

fig. 10 is a cross-sectional view of B-B in fig. 9.

The reference numerals are represented as:

1. an air inlet pipe body; 11. a tapered tube section; 12. an outlet; 13. a first vent hole; 14. an inlet; 2. a draft tube; 21. a connecting section; 211. a second vent hole; 22. a flow guide section; 221. a third vent hole; 3. a liquid separation plate; 31. a liquid passing hole; 311. a first liquid passing hole; 312. a second liquid passing hole; 100. a housing; 101. an oil content filter screen; 102. an oil baffle plate; 103. an air inlet pipe; 104. a heat exchange pipe; 105. a liquid outlet pipe; 106. a left water chamber component; 107. a right water chamber component; 200. an air inlet pipe; 201. an oil content filter screen; 202. oil baffle plate.

Detailed Description

Referring to fig. 1 to 10 in combination, according to an embodiment of the present invention, there is provided an intake pipe, for example, an intake pipe of a compressor, and particularly, an intake pipe, including an intake pipe body 1, one end of the intake pipe body 1 is an inlet 14, the other end of the intake pipe body 1 is provided with a tapered pipe section 11, an outlet 12 of the intake pipe body 1 is located on a small-diameter bottom surface of the tapered pipe section 11, the tapered pipe section 11 is configured with a plurality of first vent holes 13, and the first vent holes 13 penetrate through the inner and outer sides of the tapered pipe section 11. In this technical scheme, have on the intake pipe body 1 toper pipeline section 11 just construct on the toper pipeline section 11 first air vent 13 to can be in the refrigerant air current that has the oil content gets into wherein oil drips when in the intake pipe carry out the prefilter, and pass through 11 toper structures of toper pipeline section are collected the large granule oil in the refrigerant air current in advance, and can play the effect of recollecting to the tiny particle oil, effectively improve oil droplet separating ability and separation efficiency, especially when it is applied to the horizontal shell and tube condenser among the relevant art, form the secondary filter with the oil separating structure that has therein, greatly reduced the oil content of refrigerant in the condenser, improved oil separating effect. It should be noted that, the air inlet pipe is to be disposed in an upper area of the shell-and-tube condenser shell during specific application, that is, the inlet 14 faces upward, the outlet 12 faces downward, during a flowing process of the refrigerant air flow, gas is discharged from the first vent hole 13, oil (liquid) therein flows downward along an inner wall of the tapered pipe section 11 and is collected, and falls downward via the outlet 12 and returns oil, and the air inlet pipe mainly utilizes inertial separation and gravity separation to separate and collect large oil drops in the refrigerant air flow in advance through impact and gravity, so as to prevent the occurrence of insufficient oil content capacity reduction and the like caused by the fact that the large oil drops enter a subsequent oil content space and are blown up by the air flow to form small liquid drops by entrainment and impact.

In some embodiments, the aperture of the first vent holes 13 is larger along the flowing direction of the airflow in the intake pipe body 1, so that the flowing tube side of the airflow entering the inlet 14 can be ensured to be long enough, and the oil separation efficiency at the first vent holes 13 can be ensured.

In some embodiments, a secondary separator capable of secondarily separating fluid (specifically, for example, refrigerant gas mixed with oil component) flowing out of the first vent hole 13 is provided on the outer peripheral side of the tapered pipe section 11. Specifically, as a specific embodiment, the secondary separator is draft tube 2, process the plane of the axis of taper pipe section 11 and arbitrary generating line is the primary shaft cross-section on the primary shaft cross-section, draft tube 2 is in the same direction as the direction of flow diameter crescent of air current in the intake pipe body 1, and intake pipe simple structure among this technical scheme is applicable to the air conditioning unit that the air current degree of disorder is low, is particularly useful for little discharge capacity air conditioning unit, big difference in temperature operating mode air conditioning unit. Draft tube 2 among this technical scheme can be to by the fluid that first air vent 13 flows forms the baffling effect, shelters from by the part oil droplet that the air current was smugglied secretly and splashes, prevents effectively that the air current from carrying too much oil droplet, also, draft tube 2 set up in first air vent 13's periphery side can make to pass through the air current of smuggleing secretly the tiny particle oil droplet behind first air vent 13 strikes its wall inertial action once more and produces the secondary separation, and the oil droplet is leading-in downwards along the wall, carries out the oil return.

As another specific embodiment, the secondary separating element is a guide shell 2, in the first axial section, the guide shell 2 has a connecting section 21 connected to the tapered pipe section 11 and a guide section 22 at the periphery of the connecting section 21, a bend angle is provided between the guide section 22 and the connecting section 21, and one end of the guide shell 2 away from the connecting section 21 has a port (i.e., the end is an open structure), in this embodiment, the design of the bend angle between the guide section 22 and the connecting section 21 enables the fluid flowing out from the first vent hole 13 to have a larger space for containing and separating oil, which is beneficial to further oil separation of the gas flow (for example, the re-impact of the gas flow on the guide section 22 or the connecting section 21 will form part of liquid drops).

In some embodiments, the connecting section 21 is configured with a plurality of second vent holes 211, and/or the flow guiding section 22 is configured with a plurality of third vent holes 221, and the design of the first vent hole 13, the second vent holes 211, and the third vent holes 221 in the air flow direction can improve the flow field uniformity of small particle oil droplets, and can further improve the oil separation capability. It should be noted that the connecting section 21 should be located above the first vent hole 13 located at the highest position (based on the orientation shown in fig. 1) to avoid the collected liquid droplets from being entrained and rotated again. The second vent holes 211 may be only formed in the connecting section 21, and the third vent holes 221 may not be formed in the flow guide section 22, so that the intake pipe may be suitable for a case where airflow disturbance is large, and oil may be prevented from splashing from the flow guide section 22.

In some embodiments, the port is connected with the liquid separation plate 3, the liquid separation plate 3 is configured with a plurality of liquid passing holes 31, which are used for guiding the flow of the filtered (separated) liquid drops, and the liquid passing holes 31 are used for blocking the disturbance of the air flow and preventing the abnormal oil return. Further, the hole diameters of the liquid passing holes 31 become smaller from inside to outside along the radial direction of the liquid separation plate 3.

In a specific embodiment, the liquid separation plate 3 is connected to the outlet 12, and the liquid passing holes 31 include a first liquid passing hole 311 opposite to the outlet 12 (specifically, the outlet 12 is opposite to the first liquid passing hole 311 (coaxially or non-coaxially), and the aperture of the first liquid passing hole 311 is not smaller than that of the outlet 12, so as to ensure that the oil falls and flows out as soon as possible), and a plurality of second liquid passing holes 312 are disposed around the first liquid passing hole 311.

The shape of the through holes of the first through hole 13, the second through hole 211, and the third through hole 221 may be one or more of circular, oval, rectangular, and the like, and is preferably circular, which can facilitate processing and structural stability. The second venting holes 211 and the third venting holes 221 are regularly distributed, for example, the aperture of the second venting holes 211 is smaller and smaller along the direction away from the tapered pipe section 11, and the aperture of the third venting holes 221 is smaller and smaller along the direction away from the connecting section 21.

According to an embodiment of the present invention, a shell-and-tube condenser, in particular a horizontal shell-and-tube condenser, is further provided, including a shell 100, where the shell 100 is provided with the above-mentioned air inlet pipe 103. Specifically, an oil separation filter screen 101 and an oil baffle plate 102 located in a lower area of the oil separation filter screen 101 are further arranged in the casing 100, the oil separation filter screen 101 and the oil baffle plate 102 form an oil separation structure, a left water chamber component 106 and a right water chamber component 107 are respectively arranged at two ends of the casing 100, a plurality of heat exchange tubes 104 pass through between the left water chamber component 106 and the right water chamber component 107, an oil filtering space is formed between the oil separation filter screen 101 and the oil baffle plate 102, refrigerant fluid filtered by the air inlet tube 103 can enter the oil filtering space and exchanges heat with water in the heat exchange tubes 104 to form refrigerant liquid and flows out from the liquid outlet tube 105, so that secondary filtration of oil with liquid is formed, and an oil separation effect is further improved.

According to an embodiment of the present invention, there is also provided an air conditioner including the shell-and-tube condenser described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.