Fluorine pump refrigeration air conditioning device

Abstract

The utility model relates to a fluorine pump refrigeration air conditioning device which comprises a fluorine pump assembly, a total vapor-liquid separator, a load heat exchange unit assembly and a condenser assembly, the total vapor-liquid separator is provided with an upper inlet and a lower outlet, and a liquid refrigerant output from the lower outlet of the total vapor-liquid separator is driven by the fluorine pump assembly to enter the load heat exchange unit assembly. Each group of load heat exchange units in the load heat exchange unit assembly comprises N load heat exchange units which are connected in series, and the fluorine pump refrigeration air conditioning device further comprises N-1 split vapor-liquid separators arranged among the N load heat exchange units which are connected in series. N is greater than or equal to 2, and gaseous refrigerants separated by the separated vapor-liquid separator directly enter a gas return pipeline of the condenser assembly, so that the liquid refrigerants separated by the separated vapor-liquid separator enter the next load heat exchange unit, N is greater than or equal to 2, and the gaseous refrigerants separated by the separated vapor-liquid separator enter the next load heat exchange unit. And after being converged with a vapor-liquid mixed state refrigerant output by the last load heat exchange unit of each group of load heat exchange units, the vapor-liquid mixed state refrigerant enters the condenser assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration and air conditioning, and particularly relates to a fluorine pump refrigeration air conditioning device. Background Art

[0002] At present, for the cooling of large special equipment, an air-cooled chilled water air conditioning unit is used to refrigerate a certain concentration of ethylene glycol solution as a coolant to cool the load object. The heat exchange of the ethylene glycol solution is only sensible heat exchange. To effectively cool the temperature of a super-high temperature load, a relatively large flow rate must be provided to supply a sufficient amount of heat exchange.

[0003] The current heat exchange solution requires a complete air-cooled chilled water unit air conditioning system and a complete water system, such as a liquid supply pipeline system, a replenishing pipeline system, a constant pressure exhaust pipeline system, water pumps, valves, etc. The ambient temperature of the load usage environment ranges from -40°C to 55°C, and two sets of heat exchange pipe networks, namely compression refrigeration and conventional refrigeration (surface cooling), are required. The composition structure of the refrigeration unit is extremely complex. Moreover, the current heat exchange solution has a complex water pipeline network, with potential hazards such as leakage, seepage of the water-cooled pipe network, failure of water deaeration, cavitation of water pumps, dry wear and damage, and the presence of air affecting the water flow and thus the heat exchange. The system composition is complex, the probability of device failure is high, and the overall reliability is poor. Adopting the current heat exchange solution, the heat exchange of the coolant cannot balance multiple heat loads, and it is easy to cause condensation and damage to electrical components.

[0004] Therefore, the prior art has many problems such as low heat exchange efficiency, complex system, large variety and quantity of components, poor reliability, and quality hazards caused by load condensation.

[0005] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0006] To solve the above technical problems, the utility model provides a fluorine pump refrigeration air conditioning device, which simplifies the air conditioning heat exchange system and its components, improves the heat exchange efficiency, improves the reliability of user equipment, and can be applicable to a wide ambient temperature environment.

[0007] According to one aspect of the present utility model, a fluorine pump refrigeration air conditioning device is provided. The fluorine pump refrigeration air conditioning device includes a fluorine pump assembly, a main vapor-liquid separator, a load heat exchange unit assembly, and a condenser assembly. The main vapor-liquid separator is provided with an upper inlet and a lower outlet. The upper inlet of the main vapor-liquid separator is connected to the outlet of the condenser assembly. The lower outlet of the main vapor-liquid separator is connected to the inlet of the fluorine pump assembly. The liquid refrigerant output from the lower outlet of the main vapor-liquid separator is driven by the fluorine pump assembly into the load heat exchange unit assembly. Each group of load heat exchange units in the load heat exchange unit assembly includes N load heat exchange units connected in series. The fluorine pump refrigeration air conditioning device further includes N - 1 separate vapor-liquid separators provided between the N load heat exchange units connected in series, so that the liquid refrigerant separated by the separate vapor-liquid separators enters the next load heat exchange unit. Wherein, N≥2, and wherein, the gaseous refrigerant separated by the separate vapor-liquid separators directly enters the return air pipeline of the condenser assembly and merges with the vapor-liquid mixed refrigerant output from the last load heat exchange unit of each group of load heat exchange units and then enters the condenser assembly.

[0008] The fluorine pump refrigeration air conditioning device according to the present utility model ensures that each series-connected load exchanges heat with liquid refrigerant through the separate vapor-liquid separators. Since the heat absorption during liquid evaporation is large and the heat exchange amount is high, the heat exchange efficiency of the air conditioning device is improved.

[0009] Further preferably, the heat exchange area of the condenser assembly includes a main circulation heat exchange area located at the lower part of the condenser assembly. The gaseous refrigerant or vapor-liquid mixed refrigerant entering the condenser assembly exchanges heat and condenses with the ambient air in the main circulation heat exchange area of the condenser assembly to form liquid refrigerant. The formed liquid refrigerant enters the main vapor-liquid separator.

[0010] The fluorine pump refrigeration air conditioning device according to the present utility model adopts a main circulation heat exchange area that occupies most of the area of the condenser assembly (for example, 80% - 90% of the total area of the condenser assembly), so that the evaporated gaseous refrigerant or vapor-liquid mixed refrigerant is fully condensed by the condenser assembly, thereby improving the reliability of the air conditioning device.

[0011] Further preferably, a vapor-liquid separation net is provided inside the main vapor-liquid separator. The upper inlet of the main vapor-liquid separator includes a first upper inlet for receiving the liquid discharged from the main circulation heat exchange area of the condenser. The first upper inlet is located above the vapor-liquid separation net. The vapor-liquid mixed refrigerant entering the main vapor-liquid separator through the first upper inlet is cut by the vapor-liquid separation net, so that the gaseous refrigerant is separated.

[0012] The vapor-liquid separation mesh arranged inside the main vapor-liquid separator facilitates the separation of the gaseous refrigerant, enabling the gaseous refrigerant to enter the condenser for re-condensation, preventing the uncondensed gaseous refrigerant from accumulating more and more in the main vapor-liquid separator, reducing the storage space for the liquid refrigerant, and causing the fluorine pump to suck the vapor-liquid mixed refrigerant, thus damaging the fluorine pump.

[0013] Further preferably, the heat exchange area of the condenser assembly includes an auxiliary circulation heat exchange area located at the upper part of the condenser assembly. The upper inlet of the main vapor-liquid separator includes a second upper inlet for receiving the liquid discharged from the auxiliary circulation heat exchange area of the condenser assembly. The gaseous refrigerant separated by the vapor-liquid separation mesh enters the auxiliary circulation heat exchange area of the condenser assembly through the top gas outlet of the main vapor-liquid separator, exchanges heat with the ambient air again for condensation to form liquid refrigerant, and the liquid refrigerant formed by the re-condensation flows back to the main vapor-liquid separator through the second upper inlet.

[0014] According to the fluorine pump refrigeration air-conditioning device provided by the present invention, the main vapor-liquid separator reprocesses the uncondensed gaseous refrigerant, enabling the gaseous refrigerant to be fully condensed into liquid refrigerant, reducing the possibility of the fluorine pump sucking the vapor-liquid mixed refrigerant and thus damaging the fluorine pump, thereby improving the reliability of the air-conditioning device.

[0015] Further preferably, the condenser assembly is a finned heat exchanger.

[0016] According to the fluorine pump refrigeration air-conditioning device provided by the present invention, using a finned heat exchanger can increase the condensation area of the condenser, enabling the gaseous refrigerant to be fully condensed through the condenser, thereby improving the reliability of the air-conditioning device.

[0017] Further preferably, the load temperature to be cooled by the load heat exchange unit can be 60 - 90 °C or higher, and the ambient temperature of the load can be -40 - 55 °C.

[0018] According to the fluorine pump refrigeration air-conditioning device provided by the present invention, since the load temperature is much higher than the highest ambient temperature and the temperature of the evaporated refrigerant is higher than the ambient temperature, it can ensure the effective condensation of the refrigerant inside the condenser assembly and is applicable to a wide ambient temperature environment.

[0019] Further preferably, the load heat exchange unit assembly includes at least one group of load heat exchange units, the at least one group of load heat exchange units are connected in parallel, the condenser assembly and the load heat exchange unit assembly correspondingly include at least one group of condensers connected in parallel, and the fluorine pump assembly and the load heat exchange unit assembly correspondingly include at least one group of fluorine pumps connected in parallel.

[0020] The load heat exchange unit assembly, condenser assembly, and fluorine pump assembly formed by parallel connection can meet the requirements of various occasions.

[0021] Adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0022] 1. The fluorine pump refrigeration air conditioning device provided by the utility model has a simple structure and few components, and can streamline the air conditioning heat exchange system and components.

[0023] 2. According to the fluorine pump refrigeration air conditioning device of the utility model, by separately arranging the vapor-liquid separator, it is ensured that each series-connected load is heat exchanged with liquid refrigerant. Since the evaporation heat absorption of liquid is large and the heat exchange amount is high, the heat exchange efficiency of the air conditioning device is improved.

[0024] 3. According to the fluorine pump refrigeration air conditioning device provided by the utility model, the evaporated gaseous refrigerant is fully condensed by the condenser assembly arranged in zones, and the total vapor-liquid separator processes the uncondensed gaseous refrigerant again, so that the gaseous refrigerant is fully condensed into liquid refrigerant, reducing the possibility of the fluorine pump being damaged by inhaling the vapor-liquid mixed refrigerant, thereby improving the reliability of the air conditioning device.

[0025] 4. According to the fluorine pump refrigeration air conditioning device provided by the utility model, the load temperature is much higher than the highest ambient temperature, and the temperature of the evaporated refrigerant is higher than the ambient temperature. Therefore, it can ensure that the refrigerant is effectively condensed inside the condenser assembly and can be applied to a wide ambient temperature environment.

[0026] The following further describes in detail the specific implementation manners of the utility model with reference to the drawings. Description of the Drawings

[0027] The drawings, as a part of the utility model, are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute an improper limitation to the utility model. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0028] Figure 1 The fluorine pump refrigeration air conditioning device according to the utility model is shown.

[0029] Wherein: 1 - fluorine pump assembly; 2 - total vapor-liquid separator; 3 - condenser assembly; 4 - load heat exchange unit assembly; 5 - separately arranged vapor-liquid separator.

[0030] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the utility model in any way, but to illustrate the concept of the utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "contact", "communication" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] As Figure 1 shown Figure 1 shown is a fluorine pump refrigeration air conditioning device according to the present utility model. The fluorine pump refrigeration air conditioning device includes a fluorine pump assembly 1, a total vapor-liquid separator 2, a load heat exchange unit assembly 4, and a condenser assembly 3. The total vapor-liquid separator 2 is placed at the front end of the fluorine pump assembly 1 to provide liquid refrigerant for the fluorine pump assembly 1. The total vapor-liquid separator 2 is separated into an upper space 2-2 and a lower space 2-1 by a gas-liquid separation net 2-3. The upper space 2-2 is provided with an upper inlet and a top gas outlet. The lower space 2-1 is provided with a lower outlet. The upper inlet of the total vapor-liquid separator 2 is connected to the outlet of the condenser assembly 3. The lower outlet of the total vapor-liquid separator 2 is connected to the inlet of the fluorine pump assembly 1. The liquid refrigerant output from the lower outlet of the total vapor-liquid separator 2 is driven by the fluorine pump assembly 1 into the load heat exchange unit assembly 4. Each group of load heat exchange units in the load heat exchange unit assembly 4 includes N (N≥2) load heat exchange units Z1, Z2... connected in series. The fluorine pump refrigeration air conditioning device further includes a separate vapor-liquid separator 5. N-1 (N≥2) separate vapor-liquid separators Q1, Q2... are arranged between the N load heat exchange units Z1, Z2... connected in series, so that the liquid refrigerant separated by the separate vapor-liquid separator 5 enters the next load heat exchange unit. The gaseous refrigerant separated by the separate vapor-liquid separator 5 directly enters the return air pipeline of the condenser assembly 3 and converges with the vapor-liquid mixed refrigerant output from the last load heat exchange unit of each group of load heat exchange units and then enters the condenser assembly 3.

[0034] The fluorine pump refrigeration air-conditioning device of the present utility model uses a fluorine pump assembly 1 to drive liquid refrigerant into the load heat exchange unit assembly 4, and through a separate vapor-liquid separator 5, it ensures that each series-connected load Z1, Z2... is heat-exchanged by liquid refrigerant. Since the heat absorption of liquid evaporation is large and the heat exchange amount is high, the heat exchange efficiency of the air-conditioning device is improved.

[0035] Specifically, the liquid refrigerant in the main vapor-liquid separator 2 is driven by the fluorine pump assembly 1 and input into the first load heat exchange unit Z1. After absorbing the load heat, part of the refrigerant evaporates and gasifies. The mixed refrigerant enters the first separate vapor-liquid separator Q1. The gaseous refrigerant enters the return air pipeline through the top outlet of the separate vapor-liquid separator Q1, and the liquid refrigerant enters the second load heat exchange unit Z2 through the bottom pipeline and exchanges heat with the second load. The vapor-liquid mixed refrigerant after heat exchange is separated again by the separate vapor-liquid separator Q2 to cool the subsequent load heat exchange units. When this group of loads includes n load heat exchange units, separate vapor-liquid separators are configured on the output pipes of the previous n - 1 load heat exchange units to ensure that the refrigerant entering the next load heat exchange unit is pure liquid refrigerant. Since the heat absorption of liquid evaporation is the largest (the heat exchange of gas state is only superheat, which not only occupies a large amount of pipeline volume but also has a small heat exchange amount), the heat exchange efficiency is improved.

[0036] The fluorine pump constituting the fluorine pump assembly 1 is a variable-frequency pump, and the liquid supply amount is adjusted by controlling the operating frequency, so as to adapt to the change in the number of loads powered on. The control system detects the temperature of each load, and controls the rotation speed of the fluorine pump according to the highest load temperature and the lowest load temperature. When the lowest load temperature is lower than the preset lower limit of the control system, the rotation speed of the fluorine pump is reduced. When the highest load temperature is higher than the preset upper limit of the control system, the rotation speed of the fluorine pump is increased.

[0037] Further preferably, the heat exchange area of the condenser assembly 3 is divided into upper and lower parts. Among them, the area located in the lower part of the condenser assembly 3 is the main circulation heat exchange area S1, accounting for about 80% - 90% of the total area of the condenser assembly 3. The area located in the upper part of the condenser assembly 3 is the auxiliary circulation heat exchange area S2, accounting for about 20% - 10% of the total area of the condenser assembly 3. The gaseous or vapor-liquid mixed refrigerant evaporated by absorbing heat from the load exchanges heat with the ambient air in the main circulation heat exchange area S1 of the condenser assembly 3 and condenses into liquid refrigerant. The formed liquid refrigerant is discharged from the outlet of the main circulation heat exchange area S1 of the condenser assembly 3 and enters the main vapor-liquid separator 2 through the first upper inlet of the main vapor-liquid separator 2. The gaseous refrigerant escaping from the top gas outlet of the main vapor-liquid separator 2 enters the auxiliary circulation heat exchange area S2 of the condenser assembly 3, exchanges heat with the ambient air again and condenses into liquid refrigerant. The formed liquid refrigerant is discharged from the outlet of the auxiliary circulation heat exchange area S2 of the condenser assembly 3 and enters the main vapor-liquid separator 2 through the second upper inlet of the main vapor-liquid separator 2. The liquid refrigerant flows back to the main vapor-liquid separator 2 by the action of gravity.

[0038] The fluorine pump refrigeration air-conditioning device according to the present utility model adopts a main circulation heat exchange area that occupies most of the area of the condenser assembly (for example, 80%-90% of the condenser area), so that the evaporated gaseous refrigerant or vapor-liquid mixed refrigerant is fully condensed through the condenser, reducing the possibility that the fluorine pump sucks in the vapor-liquid mixed refrigerant and thus damaging the fluorine pump, thereby improving the reliability of the air-conditioning device.

[0039] Further preferably, a vapor-liquid separation net 2-3 is arranged inside the total vapor-liquid separator 2. The first upper inlet and the second upper inlet of the total vapor-liquid separator 2 are located above the vapor-liquid separation net 2-3. The vapor-liquid mixed refrigerant entering the total vapor-liquid separator net 2-3 through the first upper inlet and the second upper inlet is cut by the vapor-liquid separation net 2-3, so that the gaseous refrigerant is separated. The separated gaseous refrigerant enters the condenser assembly 3 again through the top air outlet of the total vapor-liquid separator 2. The auxiliary circulation heat exchange area S2 region of the condenser assembly 3 is located at the upper part of the condenser assembly 3. The upper gas of the total vapor-liquid separator 2 floats into the heat exchange tubes in the auxiliary circulation heat exchange area S2 region through the top air outlet of the total vapor-liquid separator 2 and exchanges heat with the ambient air again to condense into a liquid refrigerant. The formed liquid refrigerant flows back to the total vapor-liquid separator by gravity. This auxiliary circulation can avoid the situation that under wide ambient temperature conditions, more and more uncondensed gaseous refrigerant accumulates in the total vapor-liquid separator 2, resulting in a small storage space for the liquid refrigerant, so that the fluorine pump sucks in the vapor-liquid mixed refrigerant and damages the fluorine pump.

[0040] As an embodiment of the present utility model, the condenser assembly 3 is set as a finned heat exchanger. The gaseous refrigerant or vapor-liquid mixed refrigerant exchanges heat with the ambient air in the finned heat exchanger and enters the total vapor-liquid separator 2 after condensation. Using a finned heat exchanger can increase the condensation area of the condenser, so that the gaseous refrigerant is fully condensed through the condenser, thereby improving the reliability of the air-conditioning device.

[0041] As an embodiment of the present utility model, the load temperature to be cooled by the load heat exchange unit assembly 4 can be 60-90°C or a higher temperature, and the operating ambient temperature of the load can be -40-55°C. Since the load temperature of this fluorine pump refrigeration air-conditioning device is much higher than the highest ambient temperature and the temperature of the evaporated refrigerant is higher than the ambient temperature, it can ensure that the refrigerant is effectively condensed inside the condenser assembly 3 and can be applicable to a wide ambient temperature environment. Preferably, the highest load temperature is set not to be higher than the preset upper limit of the control system.

[0042] As an extended embodiment of the present utility model, the load heat exchange unit assembly 4 may include one or more groups of load heat exchange units. When the load heat exchange unit assembly 4 includes multiple groups of load heat exchange units, the multiple groups of load heat exchange units are connected in parallel, and the multiple load heat exchange units forming each group of load heat exchange units are connected in series. Correspondingly, the condenser assembly 3 may include one or more groups of condensers. When the condenser assembly 3 includes multiple groups of condensers, the multiple groups of condensers are connected in parallel. Correspondingly, the fluorine pump assembly 1 may include one or more groups of fluorine pumps. When the fluorine pump assembly 1 includes multiple groups of fluorine pumps, the multiple groups of fluorine pumps are connected in parallel.

[0043] The load heat exchange unit assembly, condenser assembly, and fluorine pump assembly formed by parallel connection can meet the requirements of various occasions.

[0044] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the present utility model.

[0045] Although different examples have specific components shown in the drawings, the embodiments of the present disclosure are not limited to these specific combinations. Some of the components or features in one example can be combined with the features or components in another example.

[0046] Those of ordinary skill in the art will understand that the above embodiments are exemplary rather than restrictive. That is, modifications to the present disclosure will fall within the scope of the claims. Therefore, the following claims should be studied to determine their true scope and content.

Claims

1. A fluorine pump refrigeration and air conditioning device, comprising a fluorine pump assembly, a total vapor-liquid separator, a load heat exchange unit assembly and a condenser assembly, wherein the total vapor-liquid separator is provided with an upper inlet and a lower outlet, the upper inlet of the total vapor-liquid separator is connected to the outlet of the condenser assembly, the lower outlet of the total vapor-liquid separator is connected to the inlet of the fluorine pump assembly, and the liquid refrigerant output from the lower outlet of the total vapor-liquid separator is driven by the fluorine pump assembly into the load heat exchange unit assembly, characterized in that: Each group of load heat exchange units in the load heat exchange unit assembly includes N load heat exchange units connected in series, and the fluorine pump refrigeration and air-conditioning device also includes N-1 separate vapor-liquid separators arranged between the N load heat exchange units connected in series, so that the liquid refrigerant separated by the separate vapor-liquid separators enters the next load heat exchange unit, wherein N≥2, and wherein the gaseous refrigerant separated by the separate vapor-liquid separators directly enters the return air pipeline of the condenser assembly, and enters the condenser assembly after merging with the vapor-liquid mixed refrigerant output by the last load heat exchange unit of each group of load heat exchange units.

2. The fluorine pump refrigeration and air conditioning device according to claim 1, characterized in that: The heat exchange area of ​​the condenser assembly includes a main circulation heat exchange area located at the lower part of the condenser assembly. The gaseous refrigerant or gas-liquid mixed refrigerant entering the condenser assembly exchanges heat with the ambient wind in the main circulation heat exchange area of ​​the condenser assembly and condenses to form liquid refrigerant. The formed liquid refrigerant enters the total vapor-liquid separator.

3. The fluorine pump refrigeration and air conditioning device according to claim 2, characterized in that: A vapor-liquid separation net is arranged inside the total vapor-liquid separator, and the upper inlet of the total vapor-liquid separator includes a first upper inlet for receiving the liquid outlet of the main circulation heat exchange area of ​​the condenser assembly, and the first upper inlet is located above the vapor-liquid separation net. The vapor-liquid mixed refrigerant entering the total vapor-liquid separator through the first upper inlet is cut by the vapor-liquid separation net, thereby separating the gaseous refrigerant.

4. The fluorine pump refrigeration and air conditioning device according to claim 3, characterized in that: The heat exchange area of ​​the condenser assembly includes an auxiliary circulation heat exchange area located at the upper part of the condenser assembly, and the upper inlet of the total vapor-liquid separator includes a second upper inlet for receiving the liquid outlet of the auxiliary circulation heat exchange area of ​​the condenser assembly. The gaseous refrigerant separated by the vapor-liquid separation net enters the auxiliary circulation heat exchange area of ​​the condenser assembly through the top air outlet of the total vapor-liquid separator, exchanges heat with the ambient wind again to condense to form liquid refrigerant, and the liquid refrigerant formed by the second heat exchange and condensation flows back to the total vapor-liquid separator through the second upper inlet.

5. The fluorine pump refrigeration and air conditioning device according to any one of claims 1 to 4, characterized in that: The condenser assembly is a finned heat exchanger.

6. The fluorine pump refrigeration and air conditioning device according to any one of claims 1 to 4, characterized in that: The load temperature required to be cooled by the load heat exchange unit is 60 to 90°C or higher, and the use environment temperature of the load is -40 to 55°C.

7. The fluorine pump refrigeration and air conditioning device according to any one of claims 1 to 4, characterized in that: The load heat exchange unit assembly includes at least one group of load heat exchange units, and the at least one group of load heat exchange units are connected in parallel. The condenser assembly and the load heat exchange unit assembly correspondingly include at least one group of condensers connected in parallel. The fluorine pump assembly and the load heat exchange unit assembly correspondingly include at least one group of fluorine pumps connected in parallel.

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