Ejector module for a heat pump system and heat pump system thereof

Abstract

The application discloses an ejector module for a heat pump system and a heat pump system thereof, and belongs to the technical field of heat pumps. The ejector module comprises an ejector and a drain valve. The ejector has a secondary flow channel with a secondary flow chamber and a primary flow channel with a primary flow chamber. One end of the secondary flow channel is located in the primary flow chamber. An inner wall between the outer wall of the secondary flow channel and the primary flow chamber forms a gap channel. The application avoids the situation that the ejector does not have the function of efficient gas-liquid pre-separation, so that a large amount of liquid medium is directly brought into a gas-liquid separator from the mixed refrigerant sprayed at high speed in the ejector.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, specifically to an ejector module for a heat pump system and the heat pump system thereof. Background Technology

[0002] Heat pump systems, as highly efficient and energy-saving heat transfer devices, are widely used in heating, cooling, and domestic hot water applications. Typically, a gas-liquid separator is installed before the compressor's suction port. Its function is to separate the refrigerant from the evaporator, allowing the saturated gas to enter the compressor, while the separated liquid is temporarily stored and slowly returned to the compressor or other parts of the system, thus preventing liquid slugging. With the further development of heat pump technology, ejector technology has been introduced into heat pump systems to improve the system's heating capacity and energy efficiency under low-temperature conditions. The ejector uses the kinetic energy of a high-pressure fluid to eject a low-pressure fluid, increasing the suction pressure through mixing and diffusion processes, thereby reducing the compressor's compression ratio and improving system performance.

[0003] However, in existing heat pump system architectures that include ejectors, the ejector outlet mixture is typically fed directly into a gas-liquid separator for separation. While this method can increase pressure during the high-speed mixing process inside the ejector, it does not inherently possess efficient gas-liquid pre-separation capabilities. When a two-phase flow containing a large amount of liquid refrigerant is ejected from the ejector at high speed and directly enters the gas-liquid separator, the high flow velocity and turbulent flow state often make it difficult for the gas-liquid separator to achieve complete separation in a short time.

[0004] Incomplete gas-liquid separation significantly increases the risk of liquid slugging within the compressor. Liquid slugging not only triggers the aforementioned damage risks but also dilutes the compressor's refrigerant oil, leading to decreased lubrication and accelerated wear. Simultaneously, insufficient refrigerant dryness entering the compressor causes the compression process to deviate from the ideal adiabatic compression process, resulting in reduced compressor indicated efficiency, lower overall heat pump system operating efficiency, increased energy consumption, and decreased reliability.

[0005] Therefore, it is necessary to provide ejector modules and heat pump systems for heat pump systems to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide an ejector module for a heat pump system and a heat pump system thereof, so as to solve the problems mentioned in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problem is: an ejector module for a heat pump system and the heat pump system thereof. The ejector module includes an ejector and a drain valve. The ejector has a secondary flow channel with a secondary flow chamber and a primary flow channel with a primary flow chamber. One end of the secondary flow channel is located in the primary flow chamber. A slit channel is formed between the outer wall of the secondary flow channel and the inner wall of the primary flow chamber.

[0008] The secondary flow chamber has a vertically arranged three-way pipe at its end. The upper and lower ends of the three-way pipe have inlet ports that communicate with the slit channel, and the other end has an outlet nozzle.

[0009] The ejector has a mixing zone that communicates with the secondary flow chamber, and the injection port is also located in the mixing zone;

[0010] One end of the slit channel is provided with a flow channel for discharging liquid, and the flow channel is connected to a drain valve.

[0011] Furthermore, the secondary flow channel has a straight pipe section located within the primary flow chamber. The straight pipe section is concentric with the primary flow chamber, and the gap channel is formed between the outer wall of the straight pipe section and the inner wall of the primary flow chamber.

[0012] Furthermore, the bottom of the primary flow chamber has an annular guide ring, which is located at the end of the slit channel. The outer circumferential surface of the guide ring is in contact with the inner end face of the slit channel, and the inner circumferential surface is in contact with the outer circumferential surface of the secondary flow channel. The end face of the guide ring near the inlet is a guide surface, and the height of the guide surface gradually decreases from the center outward.

[0013] Furthermore, one end of the guide surface extends to the input port.

[0014] Furthermore, the lower end of the guide ring is provided with a notch communicating with the primary flow channel, the lower end of the ejector is provided with a drain cavity, the outlet of the drain cavity is connected to a drain pipe, and the outlet end of the drain pipe is connected to a drain valve.

[0015] The three-way pipe has a vertically arranged vertical section and a horizontally arranged horizontal section, the horizontal section is connected to the vertical section, the inlet is located at both ends of the vertical section, the horizontal section is located between the injection port and the vertical section, and the notch is located directly below the vertical section.

[0016] Furthermore, the secondary flow channel is provided with a plurality of guide strips along the circumferential direction. The guide strips are spirally arranged along the axial direction of the secondary flow channel located in the primary flow chamber and are located on one side of the inlet.

[0017] Furthermore, the inner diameter of the injection port gradually decreases from the end near the secondary flow channel to the end away from the secondary flow channel.

[0018] Furthermore, one end of the ejector also has an outlet end, and the outlet end has a diffuser region communicating with the mixing zone. The inner diameter of the diffuser region gradually increases from the end closer to the mixing zone to the end farther away from the mixing zone.

[0019] The present invention also provides a heat pump system, including the ejector module for the heat pump system described above.

[0020] Furthermore, it also includes a heat pump system, which includes a condenser, a gas-liquid separator, an electronic expansion valve, an evaporator, and a compressor. The output end of the condenser is connected to the primary flow channel, the outlet end is connected to the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the inlet of the compressor, the liquid outlet is connected to the inlet of the electronic expansion valve, and the compressor outlet is connected to the inlet of the condenser.

[0021] The outlet of the electronic expansion valve is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to both the inlet of the secondary flow channel and the inlet of the compressor.

[0022] The inlet of the steam trap is connected to the outlet of the drainage chamber, and the outlet of the steam trap is connected to the inlet of the electronic expansion valve.

[0023] The beneficial effects of the present invention are as follows: The ejector module and heat pump system for heat pump systems provided by the present invention, by setting the secondary flow channel in the primary flow chamber and setting the three-way pipe in the secondary flow chamber, allows the high-temperature and high-pressure gas-liquid mixed refrigerant in the primary flow channel to achieve sufficient heat exchange between the gas in the gap channel and the secondary flow channel, and then ejects it from the injection port in the three-way pipe. This allows the liquid in the gas-liquid mixed refrigerant to be fully condensed on the outer wall and vertical section of the secondary flow chamber to remove the liquid medium. The two-phase flow containing a large amount of liquid refrigerant is pre-separated by gas and water in the ejector, avoiding the situation where the ejector does not have the function of efficient gas-liquid pre-separation, and the mixed refrigerant ejected at high speed in the ejector carries a large amount of liquid medium and directly enters the gas-liquid separator.

[0024] By setting guide strips on the outer surface of the secondary flow channel, the high-speed, high-pressure gas-liquid mixed refrigerant can rotate at high speed and generate centrifugal force. Under the action of centrifugal force, the pre-gas-liquid separation of the high-pressure gas-liquid mixed refrigerant is accelerated, thereby improving the efficiency of the entire pre-separation.

[0025] A drain valve is installed to allow the pre-separated liquid and the liquid in the gas-liquid separator to flow together into the evaporator, with only the liquid being discharged, thus preventing the loss of gas in the primary flow chamber.

[0026] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is an overall schematic diagram of the present invention;

[0029] Figure 2 This is a cross-sectional schematic diagram of the ejector of the present invention;

[0030] Figure 3 For the present invention Figure 2 Enlarged diagram of area A in the middle;

[0031] Figure 4 This is a three-dimensional cross-sectional view of the ejector of the present invention;

[0032] Figure 5 This is a schematic half-sectional view of the ejector of the present invention;

[0033] Figure 6 For the present invention Figure 5 Enlarged diagram of area B in the middle;

[0034] Figure 7 This is a schematic front view of the ejector of the present invention;

[0035] Figure 8 For the present invention Figure 7 Schematic diagram of the cross section along the E direction;

[0036] Figure 9 For the present invention Figure 7 Schematic diagram of the cross section along the F direction;

[0037] Figure 10 For the present invention Figure 7 Schematic diagram of the cross section along the G direction;

[0038] Figure 11 For the present invention Figure 7 Schematic diagram of the cross section along the H direction;

[0039] Figure 12 This is a schematic diagram of the internal flow direction of the ejector of the present invention;

[0040] Figure 13 This is a schematic diagram of the heat pump system of the present invention;

[0041] The following are the labeling elements in the figure:

[0042] 1. Ejector; 101. Mixing zone; 102. Diffuser zone; 103. Drain chamber; 2. Secondary flow channel; 201. Secondary flow chamber; 21. Guide strip; 3. Primary flow channel; 301. Primary flow chamber; 3011. Slit channel; 31. T-connector; 311. Inlet; 312. Injector; 313. Vertical section; 314. Horizontal section; 4. Outlet end; 5. Steam trap; 6. Drain pipe; 7. Guide ring; 71. Guide surface; 72. Notch; 8. Condenser; 9. Gas-liquid separator; 10. Electronic expansion valve; 11. Evaporator; 12. Compressor. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] like Figure 1-13 As shown, the present invention provides a technical solution: an ejector module for a heat pump system and the heat pump system thereof. The ejector module includes an ejector 1 and a drain valve 5. The ejector 1 has a secondary flow channel 2 with a secondary flow chamber 201 and a primary flow channel 3 with a primary flow chamber 301. One end of the secondary flow channel 2 is located inside the primary flow chamber 301. The portion of the secondary flow channel 2 located inside the primary flow chamber 301 is concentric with the primary flow channel 3, and its outer diameter is smaller than the inner diameter of the primary flow chamber 301. A slotted channel 3011 is formed between the outer wall of the secondary flow channel 2 and the inner wall of the primary flow chamber 301.

[0046] The secondary flow chamber 201 has a vertically arranged three-way pipe 31 at its end. The upper and lower ends of the three-way pipe 31 have inlet ports 311 that communicate with the slit channel 3011, and the other end has an outlet nozzle 312.

[0047] The ejector 1 has a mixing zone 101 that communicates with the secondary flow chamber 201, and the injection port 312 is also located in the mixing zone 101;

[0048] One end of the slit channel 3011 is provided with a flow channel for discharging liquid, and the flow channel is connected to the drain valve 5.

[0049] The bottom of the primary flow chamber 301 has an annular guide ring 7, which is located at the end of the slit channel 3011. The outer circumferential surface of the guide ring 7 is in contact with the inner end face of the slit channel 3011, and the inner circumferential surface is in contact with the outer circumferential surface of the secondary flow channel 2. The end face of the guide ring 7 near the inlet 311 is a guide surface 71, and the height of the guide surface 71 gradually decreases from the center outwards. This makes the guide surface 71 a large inclined surface, which can specifically be a conical surface, causing the droplets to converge and grow larger on the guide surface 71 before falling.

[0050] One end of the guide surface 71 extends to the inlet 311.

[0051] The lower end of the guide ring 7 is provided with a notch 72 that communicates with the primary flow channel 3, and the lower end of the ejector 1 is provided with a drain chamber 103. The outlet of the drain chamber 103 is connected to a drain pipe 6, and the outlet end of the drain pipe 6 is connected to the drain valve 5.

[0052] The three-way pipe 31 has a vertically arranged vertical section 313 and a horizontally arranged horizontal section 314. The horizontal section 314 is connected to the vertical section 313. The inlet 311 is located at both ends of the vertical section 313. The horizontal section 314 is located between the injection port 312 and the vertical section 313. The notch 72 is located directly below the vertical section 313.

[0053] The secondary flow channel 2 is provided with a number of guide strips 21 along the circumferential direction. The guide strips 21 are spirally arranged along the axial direction of the secondary flow channel 2 located in the primary flow chamber 301 and are located on one side of the inlet 311.

[0054] The inner diameter of the nozzle 312 gradually decreases from the end near the secondary flow channel 2 to the end away from the secondary flow channel 2.

[0055] One end of the ejector 1 also has an outlet end 4, and the outlet end 4 has a diffuser region 102 that communicates with the mixing region 101. The inner diameter of the diffuser region 102 gradually increases from the end closer to the mixing region 101 to the end farther away from the mixing region 101.

[0056] In some examples, the heat pump system includes the ejector module for the heat pump system described above, as well as a condenser 8, a gas-liquid separator 9, an electronic expansion valve 10, an evaporator 11, and a compressor 12. The output end of the condenser 8 is connected to the primary flow channel 3, the outlet end 4 is connected to the inlet of the gas-liquid separator 9, the gas outlet of the gas-liquid separator 9 is connected to the inlet of the compressor 12, the liquid outlet is connected to the inlet of the electronic expansion valve 10, and the outlet of the compressor 12 is connected to the inlet of the condenser 8.

[0057] The outlet of the electronic expansion valve 10 is connected to the inlet of the evaporator 11, and the outlet of the evaporator 11 is connected to the inlet of the secondary flow channel 2 and the inlet of the compressor 12, respectively.

[0058] The inlet of the steam trap 5 is connected to the outlet of the drainage chamber 103, and the outlet of the steam trap 5 is connected to the inlet of the electronic expansion valve 10.

[0059] In one embodiment, the heat pump system operates as follows:

[0060] Specifically, the ejector module is connected to the heat pump system, with the environmental temperature set at 25-45℃. The primary flow channel 3 of ejector 1 receives the high-pressure gas-liquid mixed refrigerant flowing out of condenser 8 as the main stream, with the flow direction referring to... Figure 12 As indicated by the solid arrow, the refrigerant temperature is several times higher than the ambient temperature. After adiabatic expansion at the outlet 4, it forms a high-speed, low-pressure airflow, generating negative pressure in the mixing zone 101. This ejects the secondary refrigerant from the evaporator 11, optimizing the throttling process, reducing irreversible losses, and improving the cooling COP. The gas-liquid separator 9 completely separates the gas and liquid phases of the refrigerant at the outlet 4, with only the dry gaseous refrigerant returning to the compressor 12 suction port. The liquid refrigerant is vaporized into a low-pressure gaseous refrigerant by the evaporator 11. The electronic expansion valve 10 controls the flow rate into the evaporator 11. The temperature of this refrigerant is close to the ambient temperature and lower than the liquid refrigerant temperature. It enters the ejector 1 from the secondary flow channel 2. The negative pressure in the ejector 1 increases the heat exchange temperature difference of the evaporator 11, preventing the cooling capacity of the hot zone from decreasing.

[0061] In another embodiment, the ejector module operates as follows:

[0062] Specifically, the high-temperature, high-pressure gas-liquid mixed refrigerant enters the primary flow chamber 301 from the primary flow channel 3, making full contact with the pipe wall of the secondary flow channel 2, while the low-temperature, low-pressure gaseous refrigerant enters the secondary flow chamber 201 from the secondary flow channel 2, flowing towards the reference... Figure 12 The dashed arrow in the middle indicates that the temperature of the outer wall of the secondary flow channel 2 is lower than that of the high-pressure gas-liquid mixed refrigerant. Under the influence of the temperature difference, when the high-pressure gas-liquid mixed refrigerant is in the large cross-section of the slotted channel 3011, the gas-liquid mixed refrigerant can be relatively evenly dispersed in the annular space of the slotted channel 3011, achieving full contact with the outer wall of the secondary flow channel 2. During this process, some droplets adhere to the outer wall surface of the secondary flow channel 2 in the slotted channel 3011, achieving gas-liquid separation, while other tiny droplets are carried forward by the gas-liquid mixed refrigerant.

[0063] When the gas-liquid mixed refrigerant carrying tiny droplets reaches the end of the gap channel 3011, it will collide with the guide surface 71 of the guide ring 7 and generate reverse flow. During the collision, the tiny droplets carried in the gas-liquid mixed refrigerant are easy to adhere to the inner wall of the guide surface 71, thereby increasing the droplet removal rate.

[0064] Since the flow area of ​​the vertical section 313 of the three-way pipe 31 is smaller than that of the slit channel 3011, and the two are arranged in a cross pattern, the droplets converge and grow larger on the guide surface 71 before falling. The droplets formed in the guide surface 71 above the vertical section 313 flow downward along the inner wall of the vertical section 313. The remaining droplets will be dispersed on the guide surface 71, the inner wall of the secondary flow channel 2, and the inner wall of the primary flow chamber 301. After the droplets converge here, they will flow downward from outside the three-way pipe 31 to the gap 72 under the action of gravity. Therefore, the setting of the three-way pipe 31 can suppress most of the fluid attached to the guide surface 71 from flowing into the three-way pipe 31, that is, reduce the probability that the liquid that has condensed and adhered to the guide surface 71 and the wall of the slit channel 3011 will flow to the nozzle 312 under the action of gravity, thus playing a physical isolation role between the gas and the separated liquid.

[0065] The vertical section 313 of the three-way pipe 31 is arranged vertically and located inside the secondary flow chamber 201, allowing the secondary flow chamber 201 to directly collide and exchange heat with the outer wall of the vertical section 313. In this way, the cooling capacity of the gaseous refrigerant in the central region of the secondary flow chamber 201 can also be fully utilized, and secondary heat exchange can be carried out with the gas-liquid mixed refrigerant containing droplets in the vertical section 313. It should be noted that when the gas-liquid mixed refrigerant exchanges heat in the gap channel 3011, the cooling capacity of the inner and outer peripheral regions of the secondary flow chamber 201 is fully released, but the cooling capacity of the central region is difficult to utilize. This arrangement can make full use of the gaseous refrigerant in the secondary flow chamber 201. The liquid generated by the secondary condensation of the gas-liquid mixed refrigerant can flow directly downward along the inner wall of the vertical section 313 of the three-way pipe 31 into the gap channel 3011, and finally flow into the notch 72 and be discharged from the drain valve 5.

[0066] As the flow area of ​​the slit channel 3011 decreases to the area of ​​the vertical section 313 of the tee pipe 31, the flow velocity increases when the cross-sectional area of ​​the flow channel decreases while the flow rate remains constant. The gas-liquid mixed refrigerant accelerates into the vertical section 313, passes through the transverse section 314, and is ejected from the injection port 312. It mixes with the low-pressure gaseous refrigerant in the secondary flow chamber 201 in the mixing zone 101, and then undergoes final separation from the diffuser zone 102 to the gas-liquid separator 9. This improves the efficiency of the gas-liquid separator 9, relieves the pressure on the heat pump system, and improves the overall working efficiency of the heat pump system.

[0067] In summary, this ejector module, by placing the secondary flow channel 2 inside the primary flow chamber 301 and the three-way pipe 31 inside the secondary flow chamber 201, allows the high-temperature and high-pressure gas-liquid mixed refrigerant in the primary flow channel 3 to achieve sufficient heat exchange between the gas in the secondary flow channel 2 and the gas in the slotted channel 3011 before being ejected from the injection port 312 inside the three-way pipe 31. This allows the liquid in the gas-liquid mixed refrigerant to be fully condensed on the outer wall and vertical section 313 of the secondary flow chamber 201 to remove the liquid medium. The two-phase flow containing a large amount of liquid refrigerant undergoes pre-gas-liquid separation in the ejector 1, avoiding the situation where the ejector 1 lacks efficient gas-liquid pre-separation function, causing the mixed refrigerant ejected at high speed in the ejector 1 to carry a large amount of liquid medium and directly enter the gas-liquid separator 9.

[0068] By providing guide strips 21 on the outer surface of the secondary flow channel 2, the high-speed, high-pressure gas-liquid mixed refrigerant can rotate at high speed and generate centrifugal force. Under the action of centrifugal force, the pre-gas-liquid separation of the high-pressure gas-liquid mixed refrigerant is accelerated, thereby improving the efficiency of the entire pre-separation.

[0069] The pre-separated liquid and the liquid in the gas-liquid separator 9 are combined and fed into the evaporator 11 by a drain valve 5, so that only the liquid is discharged and the gas in the primary flow chamber 301 is prevented from being lost.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ejector module for a heat pump system, characterized in that: Includes an ejector (1) and a drain valve (5). The ejector (1) has a secondary flow channel (2) with a secondary flow chamber (201) and a primary flow channel (3) with a primary flow chamber (301). One end of the secondary flow channel (2) is located inside the primary flow chamber (301). A slit channel (3011) is formed between the outer wall of the secondary flow channel (2) and the inner wall of the primary flow chamber (301). The secondary flow chamber (201) has a vertically arranged three-way pipe (31) at its end. The upper and lower ends of the three-way pipe (31) have inlet ports (311) that communicate with the slit channel (3011), and the other end has an outlet nozzle (312). The ejector (1) has a mixing zone (101) that communicates with the secondary flow chamber (201), and the jet port (312) is also located in the mixing zone (101); One end of the slit channel (3011) is provided with a flow channel for discharging liquid, and the flow channel is connected to the drain valve (5); The secondary flow channel (2) has a straight pipe section located within the primary flow chamber (301). The straight pipe section is concentric with the primary flow chamber (301), and the slit channel (3011) is formed between the outer wall of the straight pipe section and the inner wall of the primary flow chamber (301). The bottom of the primary flow chamber (301) has an annular guide ring (7), which is located at the end of the slit channel (3011). The outer circumferential surface of the guide ring (7) is in contact with the inner end face of the slit channel (3011), and the inner circumferential surface is in contact with the outer circumferential surface of the secondary flow channel (2). The end face of the guide ring (7) near the inlet (311) is a guide surface (71), and the height of the guide surface (71) gradually decreases from the center outward. The lower end of the guide ring (7) is provided with a notch (72) that communicates with the primary flow channel (3), and the lower end of the ejector (1) is provided with a drain cavity (103). The outlet of the drain cavity (103) is connected to a drain pipe (6), and the outlet end of the drain pipe (6) is connected to a drain valve (5). The three-way pipe (31) has a vertically arranged vertical section (313) and a horizontally arranged horizontal section (314), the horizontal section (314) is connected to the vertical section (313), the inlet (311) is located at both ends of the vertical section (313), the horizontal section (314) is located between the jet port (312) and the vertical section (313), and the notch (72) is located directly below the vertical section (313).

2. The ejector module for a heat pump system according to claim 1, characterized in that: One end of the guide surface (71) extends to the inlet (311).

3. The ejector module for a heat pump system according to claim 1, characterized in that: The secondary flow channel (2) is provided with a plurality of guide strips (21) along the circumferential direction. The guide strips (21) are spirally arranged along the axial direction of the secondary flow channel (2) located in the primary flow chamber (301) and are located on one side of the inlet (311).

4. The ejector module for a heat pump system according to claim 1, characterized in that: The inner diameter of the injection port (312) gradually decreases from the end near the secondary flow channel (2) to the end away from the secondary flow channel (2).

5. The ejector module for a heat pump system according to claim 1, characterized in that: The ejector (1) also has an outlet end (4) at one end, and the outlet end (4) has a diffuser (102) communicating with the mixing zone (101). The inner diameter of the diffuser (102) gradually increases from the end near the mixing zone (101) to the end away from the mixing zone (101).

6. A heat pump system, characterized in that: Includes the ejector module for a heat pump system as described in any one of claims 1-5.

7. The heat pump system according to claim 6, characterized in that: It also includes a condenser (8), a gas-liquid separator (9), an electronic expansion valve (10), an evaporator (11), and a compressor (12). The output end of the condenser (8) is connected to the primary flow channel (3), the outlet end (4) is connected to the inlet of the gas-liquid separator (9), the gas outlet of the gas-liquid separator (9) is connected to the inlet of the compressor (12), the liquid outlet is connected to the inlet of the electronic expansion valve (10), and the outlet of the compressor (12) is connected to the inlet of the condenser (8). The outlet of the electronic expansion valve (10) is connected to the inlet of the evaporator (11), and the outlet of the evaporator (11) is connected to the inlet of the secondary flow channel (2) and the inlet of the compressor (12), respectively. The inlet of the steam trap (5) is connected to the outlet of the drain chamber (103), and the outlet of the steam trap (5) is connected to the inlet of the electronic expansion valve (10).

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