Air supply structure, centrifugal chiller and air conditioner

Abstract

The present invention provides an air replenishment structure, including: an ice-making heat exchanger, a refrigeration heat exchanger; a compressor, the ice-making heat exchanger and the refrigeration heat exchanger are respectively connected to the compressor; a secondary air replenishment device is connected between the ice-making heat exchanger and the ice-making heat exchanger, and the secondary air replenishment device is provided with a secondary air replenishment channel connected to the compressor, and the secondary air replenishment device can replenish air to the compressor for the second time. The present invention adds an independent flasher to the existing dual-evaporator ice storage centrifuge system in the industry, and cooperates with a three-stage centrifugal compressor to achieve a three-stage compression and two-stage air replenishment structure, thereby increasing the upper limit of the operating pressure ratio of the ice storage centrifuge, so that the ice storage centrifuge can produce ice water at a lower temperature and adapt to applications with a larger pressure ratio.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal chillers, and in particular relates to an air supply structure, a centrifugal chiller and an air conditioner. Background Art

[0002] As the concept of energy conservation and emission reduction becomes more and more popular, as an important equipment for peak shifting and valley filling in the power industry, ice storage dual-mode centrifuges are increasingly used in large-scale cooling energy stations. In order to further improve the energy-saving effect, the dual heat exchanger solution has been developed and applied to the dual-mode centrifuge system.

[0003] Although the centrifugal system of the double heat exchanger and two-stage compressor can solve the problem of low heat exchange efficiency of the heat exchanger when the single heat exchanger unit operates in refrigeration conditions, it is limited by the surge characteristics of the two-stage impeller, and the operating pressure ratio of the ice-making condition is limited, and it is impossible to achieve lower ice water outlet temperature or high cooling water temperature operating conditions. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that the centrifugal system of the double heat exchanger two-stage compressor is limited by the surge characteristics of the two-stage impeller, and the operating pressure ratio of the ice-making condition is limited, and it is impossible to achieve a lower ice water outlet temperature or a high cooling water temperature operating condition, thereby providing an air replenishment structure, a centrifugal chiller and an air conditioner.

[0005] In order to solve the above problems, the present invention provides a gas replenishing structure, comprising:

[0006] Ice making heat exchanger, refrigeration heat exchanger;

[0007] The compressor, the ice-making heat exchanger, and the refrigeration heat exchanger are respectively connected to the compressor;

[0008] A secondary air supply device is connected between the ice-making heat exchangers. The secondary air supply device is provided with a secondary air supply channel connected to the compressor. The secondary air supply device can supply secondary air to the compressor.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] Preferably, the secondary air supply device comprises a flasher, which is provided with at least one flash inlet, at least one flash air outlet, and at least one flash liquid outlet.

[0011] Preferably, there is one flash exhaust port, which is connected to the compressor through a secondary air supply channel to supply air to the compressor for the second time.

[0012] Preferably, the compressor is a three-stage compression, and the gas provided by the secondary air supply channel is supplemented to the outlet of the second-stage compression, and participates in the third-stage compression together with the gas compressed in the two stages.

[0013] Preferably, there are two flash inlets, namely a first flash inlet and a second flash inlet. The first flash inlet is connected to the liquid phase outlet of the ice-making heat exchanger, and the second flash inlet is connected to the liquid phase outlet of the refrigeration heat exchanger.

[0014] Preferably, there are two flash liquid outlets, namely a first flash liquid outlet and a second flash liquid outlet. The first flash liquid outlet is connected to the liquid phase outlet of the ice-making heat exchanger, and the second flash liquid outlet is connected to the liquid phase outlet of the refrigeration heat exchanger.

[0015] Preferably, the liquid phase outlet of the ice-making heat exchanger is provided with a first liquid phase channel, and the first liquid phase channel is respectively connected with the first flash inlet and the first flash liquid outlet;

[0016] And / or, the liquid phase outlet of the refrigeration heat exchanger is provided with a second liquid phase channel, and the second liquid phase channel is respectively connected with the second flash inlet and the second flash liquid outlet.

[0017] Preferably, the first liquid phase channel is connected to a first three-way switching valve, and the first flash inlet and the first flash outlet are respectively connected to the first liquid phase channel through the first three-way switching valve;

[0018] And / or, the second liquid phase channel is connected to a second three-way switching valve, and the second flash inlet and the second flash liquid outlet are respectively connected to the second liquid phase channel through the second three-way switching valve.

[0019] Preferably, a first throttle valve is provided between the first flash inlet and the first three-way switching valve, and / or a second throttle valve is provided between the first flash discharge outlet and the first three-way switching valve, and / or a third throttle valve is provided between the second flash inlet and the second three-way switching valve, and / or a fourth throttle valve is provided between the second flash discharge outlet and the second three-way switching valve.

[0020] Preferably, a bending structure is provided at the internal port of the first flash inlet, and the bending structure can prevent the refrigerant entering the flash device from directly flowing to the flash outlet;

[0021] And / or, the inner port of the second flash inlet is provided with a bending structure, and the bending structure can prevent the refrigerant entering the flash device from directly flowing to the flash outlet.

[0022] Preferably, the gas phase outlet of the ice-making heat exchanger is connected to a first gas phase channel, the first gas phase channel is connected to the air intake port of the compressor, and a first valve is provided on the first gas phase channel;

[0023] And / or, the gas phase outlet of the refrigeration heat exchanger is connected to a second gas phase channel, the second gas phase channel is connected to the air intake port of the compressor, and a second valve is provided on the second gas phase channel.

[0024] Preferably, the ice-making heat exchanger is further provided with a first primary air supply channel, the first primary air supply channel is connected to the compressor, and a third valve is provided on the first primary air supply channel;

[0025] And / or, the refrigeration heat exchanger is further provided with a second primary air supply channel, the second primary air supply channel is connected to the compressor, and a fourth valve is provided on the second primary air supply channel.

[0026] Preferably, the compressor is a three-stage compressor, and the gas provided by the first primary air supply channel is supplemented to the outlet of the first stage compression, and participates in the second stage compression together with the gas compressed in the first stage.

[0027] Preferably, the refrigerant inlet of the ice-making heat exchanger is connected to a first refrigerant inlet pipe, the first refrigerant inlet pipe is connected to the refrigerant outlet of the condenser, and a fifth valve and a fifth throttle valve are sequentially arranged on the first refrigerant inlet pipe;

[0028] And / or, the refrigerant inlet of the refrigeration heat exchanger is connected to a second refrigerant inlet pipe, the second refrigerant inlet pipe is connected to the refrigerant outlet of the condenser, and a sixth valve and a sixth throttle valve are sequentially arranged on the second refrigerant inlet pipe.

[0029] Preferably, the flash discharge air outlet of the flasher is arranged at the top of the flasher, and / or the flash discharge liquid outlet of the flasher is arranged at the bottom of the flasher.

[0030] A centrifugal chiller adopts any of the above-mentioned air supply structures.

[0031] An air conditioner adopts any one of the above-mentioned air replenishing structures.

[0032] The air replenishing structure, centrifugal chiller and air conditioner provided by the present invention have at least the following beneficial effects:

[0033] The present invention adds an independent flash device to the existing dual-evaporator ice storage centrifuge system in the industry, and uses a three-stage centrifugal compressor in conjunction to achieve a three-stage compression and two-stage air replenishment structure, thereby increasing the upper limit of the operating pressure ratio of the ice storage centrifuge, allowing the ice storage centrifuge to produce ice water at a lower temperature and adapt to applications with a larger pressure ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of an air replenishing structure according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the secondary air supply device according to an embodiment of the present invention.

[0036] The reference numerals are:

[0037] 1. Ice making heat exchanger; 2. Refrigeration heat exchanger; 3. Compressor; 4. Secondary air supply device; 5. Secondary air supply channel; 6. Flasher; 7. First flash inlet; 8. Second flash inlet; 9. Flash outlet; 10. First flash outlet; 11. Second flash outlet; 12. First liquid phase channel; 13. Second liquid phase channel; 14. First three-way switching valve; 15. Second three-way switching valve; 16. First throttle valve; 17. Second throttle valve ; 18. The third throttle valve; 19. The fourth throttle valve; 20. The bending structure; 21. The first gas phase channel; 22. The first valve; 23. The second gas phase channel; 24. The second valve; 25. The first primary air supply channel; 26. The third valve; 27. The second primary air supply channel; 28. The fourth valve; 29. ​​The first refrigerant inlet pipe; 30. The condenser; 31. The fifth valve; 32. The fifth throttle valve; 33. The sixth valve; 34. The sixth throttle valve. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Combination Figure 1 to Figure 2 As shown, an embodiment of the present invention provides an air replenishment structure, including: an ice-making heat exchanger 1, a refrigeration heat exchanger 2; a compressor 3, the ice-making heat exchanger 1 and the refrigeration heat exchanger 2 are respectively connected to the compressor 3; a secondary air replenishment device 4 is connected between the ice-making heat exchanger 1 and the ice-making heat exchanger 1, and the secondary air replenishment device 4 is provided with a secondary air replenishment channel connected to the compressor 3, and the secondary air replenishment device 4 can provide secondary air replenishment to the compressor 3.

[0040] In view of the problem of limited operating pressure ratio in ice-making conditions in the dual-evaporator two-stage compressor centrifugal system in the prior art, the air supply structure of the embodiment of the present invention proposes a multi-stage compression and secondary air supply structure for a dual-evaporator centrifugal unit, which further improves the design pressure ratio of the unit under ice-making conditions, so that the unit can produce ice water with lower temperature or adapt to operating conditions with high cooling water temperature.

[0041] Preferably, the secondary air supply device 4 includes a flash condenser 6, which is provided with at least one flash inlet, at least one flash air outlet 9, and at least one flash liquid outlet. The flash condenser is also called an economizer, and its function is to separate the gaseous part of the liquid refrigerant after flowing through the throttling device, and the separated gaseous refrigerant is led into the compressor and mixed with the refrigerant at the previous impeller outlet, which can reduce the superheat of the refrigerant at the impeller outlet, so that it can save compression work when performing the next stage of compression.

[0042] Preferably, there is one flash outlet 9, which is connected to the compressor 3 through the secondary air supply channel 5, and supplies air to the compressor 3 for the second time. The compressor 3 is a three-stage compression, and the gas provided by the secondary air supply channel 5 is supplemented to the outlet of the second stage compression, and participates in the third stage compression together with the gas compressed in the two stages, thereby realizing the three-stage compression and two-stage air supply, and increasing the compression work of the compressor.

[0043] Preferably, since the order in which the refrigerant flows through the ice-making heat exchanger 1 and the refrigeration heat exchanger 2 is different under the refrigeration condition and the heating condition, it is necessary to simultaneously consider the requirement that the discharge of the two heat exchangers can preferentially flow into the flash inlet 6. There are two flash inlets, namely the first flash inlet 7 and the second flash inlet 8. The first flash inlet 7 is connected to the liquid phase outlet of the ice-making heat exchanger 1, and the second flash inlet 8 is connected to the liquid phase outlet of the refrigeration heat exchanger 2.

[0044] Similarly, there are two flash liquid outlets, namely, a first flash liquid outlet 10 and a second flash liquid outlet 11. The first flash liquid outlet 10 is connected to the liquid phase outlet of the ice-making heat exchanger 1, and the second flash liquid outlet 11 is connected to the liquid phase outlet of the refrigeration heat exchanger 2. The liquid refrigerant in the flash 6 can enter the ice-making heat exchanger 1 and the refrigeration heat exchanger 2 through the first flash liquid outlet 10 and the second flash liquid outlet 11, respectively.

[0045] Preferably, the liquid phase outlet of the ice-making heat exchanger 1 is provided with a first liquid phase channel 12, and the first liquid phase channel 12 is respectively connected with the first flash inlet 7 and the first flash liquid outlet 10. The gas-liquid separated refrigerant in the ice-making heat exchanger 1, wherein the liquid refrigerant can enter the flasher 6 through the first flash inlet 7, and the liquid refrigerant generated in the flasher 6 can also reach the ice-making heat exchanger 1 through the first flash liquid outlet 10.

[0046] And / or, the liquid phase outlet of the refrigeration heat exchanger 2 is provided with a second liquid phase channel 13, and the second liquid phase channel 13 is respectively connected with the second flash inlet 8 and the second flash liquid outlet 11. The gas-liquid separated refrigerant in the refrigeration heat exchanger 2, wherein the liquid refrigerant can enter the flash 6 through the second flash inlet 8, and the liquid refrigerant generated in the flash 6 can also reach the refrigeration heat exchanger 2 through the second flash liquid outlet 11.

[0047] Preferably, the first liquid phase channel 12 is connected to the first three-way switching valve 14, and the first flash inlet 7 and the first flash liquid outlet 10 are respectively connected to the first liquid phase channel 12 through the first three-way switching valve 14. The first three-way switching valve 14 can realize the passage switching between the first flash inlet 7 and the ice-making heat exchanger 1 or the first flash liquid outlet 10 and the ice-making heat exchanger 1, thereby satisfying the functional switching under the two working conditions of refrigeration and ice making.

[0048] And / or, the second liquid phase channel 13 is connected to a second three-way switching valve 15, and the second flash inlet 8 and the second flash liquid outlet 11 are respectively connected to the second liquid phase channel 13 through the second three-way switching valve 15. The second three-way switching valve 15 can realize the passage switching between the second flash inlet 8 and the refrigeration heat exchanger 2 or the second flash liquid outlet 11 and the refrigeration heat exchanger 2, thereby meeting the functional switching under the two working conditions of refrigeration and ice making.

[0049] Preferably, a first throttle valve 16 is provided between the first flash inlet 7 and the first three-way switching valve 14, and / or a second throttle valve 17 is provided between the first flash discharge outlet 10 and the first three-way switching valve 14, and / or a third throttle valve 18 is provided between the second flash inlet 8 and the second three-way switching valve 15, and / or a fourth throttle valve 19 is provided between the second flash discharge outlet 11 and the second three-way switching valve 15.

[0050] Preferably, a bending structure 20 is provided at the inner port of the first flash inlet 7, and the bending structure 20 can prevent the refrigerant entering the flasher 6 from flowing directly to the flash outlet 9; the inner port of the second flash inlet 8 is provided with a bending structure 20, and the bending structure 20 can prevent the refrigerant entering the flasher 6 from flowing directly to the flash outlet 9. The flash outlet of the flasher 6 is arranged at the top of the flasher 6, and / or the flash outlet of the flasher 6 is arranged at the bottom of the flasher 6. The bending structure 20 can effectively prevent the refrigerant liquid from flowing straight upward to form a fountain effect, causing the gas refrigerant at the top outlet of the flasher 6 to carry liquid; at the same time, the flash outlet is arranged at the bottom of the flasher 6, and the second throttle valve 17 and the fourth throttle valve 19 are located directly below the flasher 6, ensuring that in both operating modes, an effective liquid seal is formed in front of the second throttle valve 17 and the fourth throttle valve 19, thereby enhancing the throttling effect.

[0051] Preferably, the gas phase outlet of the ice-making heat exchanger 1 is connected to a first gas phase channel 21, which is connected to the air intake port of the compressor 3, and a first valve 22 is provided on the first gas phase channel 21; the gas phase outlet of the refrigeration heat exchanger 2 is connected to a second gas phase channel 23, which is connected to the air intake port of the compressor 3, and a second valve 24 is provided on the second gas phase channel 23.

[0052] Preferably, the ice-making heat exchanger 1 is further provided with a first primary air supply channel 25, which is connected to the compressor 3, and a third valve 26 is provided on the first primary air supply channel 25; the refrigeration heat exchanger 2 is further provided with a second primary air supply channel 27, which is connected to the compressor 3, and a fourth valve 28 is provided on the second primary air supply channel 27. The compressor 3 is a three-stage compression, and the gas provided by the first primary air supply channel 25 is supplemented to the outlet of the first stage compression, and participates in the second stage compression together with the gas compressed in the first stage.

[0053] Preferably, the refrigerant inlet of the ice-making heat exchanger 1 is connected to a first refrigerant inlet pipe 29, which is connected to the refrigerant outlet of the condenser 30, and a fifth valve 31 and a fifth throttle valve 32 are sequentially provided on the first refrigerant inlet pipe 29; the refrigerant inlet of the refrigeration heat exchanger 2 is connected to a second refrigerant inlet pipe, which is connected to the refrigerant outlet of the condenser 30, and a sixth valve 33 and a sixth throttle valve 34 are sequentially provided on the second refrigerant inlet pipe.

[0054] When the unit is running in ice-making mode, the chilled water inlet and outlet water passages flowing through the refrigeration heat exchanger 2 are closed, and the glycol inlet and outlet water passages flowing through the ice-making heat exchanger 1 are connected. The first valve 22, the fourth valve 28, and the sixth valve 33 are opened, and the second valve 24, the third valve 26, and the fifth valve 31 are closed; the a and b ends of the first three-way switching valve 14 are connected, and the c end is blocked, that is, the first liquid phase channel 12 is connected to the first flash inlet 7, and the first flash outlet is blocked, and the a and c ends of the second three-way switching valve 15 are connected, and the b end is blocked, that is, the second liquid phase channel 13 is connected to the second flash outlet 11, and the second flash inlet 8 is blocked. At this time, the refrigeration evaporator is used as a primary flash evaporator 6. After the liquid refrigerant comes out from the bottom of the condenser 30, it passes through the sixth valve 33 and the sixth throttle valve 34 and enters the refrigeration evaporator. Here, the gas and liquid are separated. The gas passes through the fourth valve 28 and is supplemented by the second primary air supply channel 27, and enters the compressor 3. Together with the gas at the outlet of the first impeller, the liquid participates in the secondary compression. After coming out from the bottom of the refrigeration evaporator, it passes through the first three-way switching valve 14 and the first throttle valve 16 and enters the flash evaporator 6. The gas and liquid are separated again. The separated gas The liquid enters the compressor 3 through the flash outlet 9 at the top of the flasher 6 and the secondary air supply channel 5, and participates in the three-stage compression together with the gas at the outlet of the secondary impeller. The liquid flows out from the bottom of the flasher 6, enters the ice-making evaporator after passing through the fourth throttle valve 19 and the second three-way switching valve 15, absorbs the heat of the ethylene glycol water and evaporates into gas, and then enters the air intake of the compressor 3 through the first valve 22, and is compressed by the first impeller; the high-temperature gas after the three-stage compression of the compressor 3 enters the condenser 30 through the exhaust pipe, discharges heat to the cooling water and condenses into liquid, completing the refrigeration cycle.

[0055] Similarly, when the unit is running in the cooling mode, the chilled water inlet and outlet water paths flowing through the refrigeration heat exchanger 2 are connected, and the glycol inlet and outlet water paths flowing through the ice-making heat exchanger 1 are closed. The second valve 24, the third valve 26, and the fifth valve 31 are opened, and the first valve 22, the fourth valve 28, and the sixth valve 33 are closed; the a and b ends of the second three-way switching valve 15 are connected, and the c end is blocked, that is, the second liquid phase channel 13 is connected to the second flash inlet 8, and the second flash discharge outlet 11 is blocked. The a and c ends of the first three-way switching valve 14 are connected, and the b end is blocked, that is, the first liquid phase channel 12 is connected to the first flash discharge outlet 10, and the first flash inlet 7 is blocked. At this time, the ice-making evaporator is used as a primary flasher 6. After the liquid refrigerant comes out from the bottom of the condenser 30, it passes through the fifth valve 31 and the fifth throttle valve 32 and enters the ice-making evaporator. Here, the gas and liquid are separated. The gas passes through the third valve 26 and is supplemented by the first primary air supply channel 25, and enters the compressor 3 to participate in the secondary compression together with the gas at the first impeller outlet. After the liquid comes out from the bottom of the ice-making evaporator, it passes through the second three-way switching valve 15 and the second throttle valve 17 and enters the flasher 6. The gas and liquid are separated again. The separated gas The liquid enters the compressor 3 through the flash outlet 9 at the top of the flash igniter 6 and the secondary air supply channel 5, and participates in the three-stage compression together with the gas at the outlet of the secondary impeller. The liquid flows out from the bottom of the flash igniter 6, enters the refrigeration evaporator after passing through the second throttle valve 17 and the first three-way switching valve 14, absorbs the heat of the chilled water and evaporates into gas, and then enters the suction port of the compressor 3 through the first valve 22, and is compressed by the first impeller; the high-temperature gas after the three-stage compression of the compressor 3 enters the condenser 30 through the exhaust pipe, discharges heat to the cooling water and condenses into liquid, completing the refrigeration cycle.

[0056] The throttle valve in the present application can be an electronic expansion valve, an electrically adjustable orifice plate or a fixed orifice plate, or even any combination of the above three throttling devices. Similarly, the valve can also be an electric valve or other types of valves.

[0057] The air replenishment structure of the present invention adds an independent flasher to the existing dual-evaporator ice storage centrifuge system in the industry, and is used in conjunction with a three-stage centrifugal compressor to achieve a three-stage compression and two-stage air replenishment structure, thereby increasing the upper limit of the operating pressure ratio of the ice storage centrifuge and enabling the ice storage centrifuge to produce ice water at a lower temperature and adapt to applications with a larger pressure ratio.

[0058] A centrifugal chiller adopts any of the above-mentioned air supply structures.

[0059] An air conditioner adopts any one of the above-mentioned air replenishing structures.

[0060] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A gas replenishing structure, characterized in that: include: Ice making heat exchanger, refrigeration heat exchanger; A compressor, wherein the ice-making heat exchanger and the refrigeration heat exchanger are respectively connected to the compressor; A secondary air supply device is connected between the ice-making heat exchanger and the ice-making heat exchanger, and the secondary air supply device is provided with a secondary air supply channel connected to the compressor, and the secondary air supply device can provide secondary air supply to the compressor; The gas phase outlet of the ice-making heat exchanger is connected to a first gas phase channel, the first gas phase channel is connected to the air intake port of the compressor, and a first valve is provided on the first gas phase channel; And / or, the gas phase outlet of the refrigeration heat exchanger is connected to a second gas phase channel, the second gas phase channel is connected to the air intake port of the compressor, and a second valve is provided on the second gas phase channel; The ice-making heat exchanger is further provided with a first primary air supply channel, the first primary air supply channel is connected to the compressor, and a third valve is provided on the first primary air supply channel; And / or, the refrigeration heat exchanger is further provided with a second primary air supply channel, the second primary air supply channel is connected to the compressor, and a fourth valve is provided on the second primary air supply channel; The compressor is a three-stage compression system. The gas provided by the first primary air supply channel is supplemented to the outlet of the first stage compression and participates in the second stage compression together with the gas compressed in the first stage.

2. The air replenishing structure according to claim 1, characterized in that: The secondary air supply device comprises a flasher, and the flasher is provided with at least one flash inlet, at least one flash air outlet, and at least one flash liquid outlet.

3. The air replenishing structure according to claim 2, characterized in that: There is one flash exhaust port, and the flash exhaust port is connected to the compressor through the secondary air supply channel to provide secondary air supply to the compressor.

4. The air replenishing structure according to claim 3, characterized in that: The compressor is a three-stage compression system. The gas provided by the secondary air supply channel is supplemented to the outlet of the second-stage compression, and participates in the third-stage compression together with the gas compressed in the two stages.

5. The air replenishing structure according to claim 2, characterized in that: There are two flash inlets, namely a first flash inlet and a second flash inlet. The first flash inlet is connected to the liquid phase outlet of the ice-making heat exchanger, and the second flash inlet is connected to the liquid phase outlet of the refrigeration heat exchanger.

6. The air replenishing structure according to claim 5, characterized in that: There are two flash liquid outlets, namely a first flash liquid outlet and a second flash liquid outlet. The first flash liquid outlet is connected to the liquid phase outlet of the ice-making heat exchanger, and the second flash liquid outlet is connected to the liquid phase outlet of the refrigeration heat exchanger.

7. The air replenishing structure according to claim 6, characterized in that: The liquid phase outlet of the ice-making heat exchanger is provided with a first liquid phase channel, and the first liquid phase channel is respectively connected with the first flash inlet and the first flash liquid outlet; And / or, the liquid phase outlet of the refrigeration heat exchanger is provided with a second liquid phase channel, and the second liquid phase channel is respectively connected with the second flash inlet and the second flash liquid outlet.

8. The air replenishing structure according to claim 7, characterized in that: The first liquid phase channel is connected to a first three-way switching valve, and the first flash inlet and the first flash outlet are respectively connected to the first liquid phase channel through the first three-way switching valve; And / or, the second liquid phase channel is connected to a second three-way switching valve, and the second flash inlet and the second flash liquid outlet are respectively connected to the second liquid phase channel through the second three-way switching valve.

9. The air replenishing structure according to claim 8, characterized in that: A first throttle valve is provided between the first flash inlet and the first three-way switching valve, and / or a second throttle valve is provided between the first flash discharge outlet and the first three-way switching valve, and / or a third throttle valve is provided between the second flash inlet and the second three-way switching valve, and / or a fourth throttle valve is provided between the second flash discharge outlet and the second three-way switching valve.

10. The air replenishing structure according to claim 6, characterized in that: A bending structure is provided at the inner port of the first flash inlet, and the bending structure can prevent the refrigerant entering the flash device from directly flowing to the flash outlet; And / or, the inner port of the second flash inlet is provided with a bending structure, and the bending structure can prevent the refrigerant entering the flash device from directly flowing to the flash outlet.

11. The air replenishing structure according to claim 1, characterized in that: The refrigerant inlet of the ice-making heat exchanger is connected to a first refrigerant inlet pipe, the first refrigerant inlet pipe is connected to the refrigerant outlet of the condenser, and a fifth valve and a fifth throttle valve are sequentially arranged on the first refrigerant inlet pipe; And / or, the refrigerant inlet of the refrigeration heat exchanger is connected to a second refrigerant inlet pipe, the second refrigerant inlet pipe is connected to the refrigerant outlet of the condenser, and a sixth valve and a sixth throttle valve are sequentially provided on the second refrigerant inlet pipe.

12. The air replenishing structure according to claim 2, characterized in that: The flash discharge outlet of the flasher is arranged at the top of the flasher, and / or the flash discharge outlet of the flasher is arranged at the bottom of the flasher.

13. A centrifugal chiller, characterized in that: The air replenishing structure according to any one of claims 1 to 12 is adopted.

14. An air conditioner, characterized in that: The air replenishing structure according to any one of claims 1 to 12 is adopted.

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