Air conditioning unit and air conditioning system for data center

Abstract

The utility model discloses an air conditioning unit and an air conditioning system for a data center, the air conditioning unit comprises a liquid storage tank, the liquid storage tank comprises a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet, the refrigerant inlet of the liquid storage tank is connected with the refrigerant outlet of a condenser, the first refrigerant outlet of the liquid storage tank is connected with the refrigerant inlet of a throttling device, and the second refrigerant outlet of the liquid storage tank is connected with the refrigerant outlet of a condenser; a second refrigerant outlet of the liquid storage tank is connected with a first connecting point on a pipeline between the evaporator and the compressor unit; and the fluorine pump branch and the throttling device are arranged in parallel, a fluorine pump is arranged on the fluorine pump branch, and the fluorine pump branch, the liquid storage tank and the evaporator form a standby refrigerant circulation flow path which is used for exchanging heat for the evaporator through the standby refrigerant circulation flow path when the main refrigerant circulation flow path of the air conditioning unit breaks down. The utility model solves the problem that the data center has no cold supply when the host of the air-conditioning system for the data center in the prior art fails, protects the stable operation of the data center, and improves the emergency processing capacity of the air-conditioning unit at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, and in particular to an air conditioning unit and an air conditioning system for a data center. Background Art

[0002] With the development of intelligent computing, the power of data center cabinets is getting higher and higher, which puts higher requirements on the HVAC of data centers. The traditional heat dissipation mode can no longer solve the heat dissipation problem of CPU (Central Processing Unit) \GPU (Graphics Processing Unit), and the demand for cooling in data centers is gradually increasing.

[0003] The existing data center air conditioning system consists of a single or multiple compressors in parallel. However, the cooling capacity of a single compressor is small, and multiple compressors in parallel occupy a large building area. At the same time, there is no redundant equipment in the system. When the host machine is shut down unexpectedly, it may cause a lack of cooling capacity in the computer room, resulting in untimely heat dissipation in the data center, causing many difficulties for the normal operation of the data center.

[0004] With regard to the problem in the related art that a data center has no cooling supply when a host of an air conditioning system in the data center fails, no effective solution has been proposed yet. Utility Model Content

[0005] The utility model provides an air conditioning unit and an air conditioning system for a data center, which at least solves the problem in the prior art that the data center has no cold supply when the mainframe of the air conditioning system for the data center fails.

[0006] To solve the above technical problems, according to one aspect of an embodiment of the utility model, an air-conditioning unit is provided, comprising: a compressor unit, a condenser, a throttling device and an evaporator connected in sequence; a liquid storage tank, the liquid storage tank comprising a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet, the refrigerant inlet of the liquid storage tank is connected to the refrigerant outlet of the condenser, the first refrigerant outlet of the liquid storage tank is connected to the refrigerant inlet of the throttling device, and the second refrigerant outlet of the liquid storage tank is connected to a first connection point on the pipeline between the evaporator and the compressor unit; a fluorine pump branch, which is arranged in parallel with the throttling device, and a fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a backup refrigerant circulation flow path, which is used to exchange heat for the evaporator through the backup refrigerant circulation flow path when the main refrigerant circulation flow path of the air-conditioning unit fails.

[0007] Furthermore, it also includes: a fluorine pump throttle valve located on the fluorine pump branch.

[0008] Furthermore, the compressor unit includes: a high-pressure compressor and a low-pressure compressor, the suction port of the low-pressure compressor is connected to the refrigerant outlet of the evaporator, the exhaust port of the low-pressure compressor is connected to the suction port of the high-pressure compressor, and the exhaust port of the high-pressure compressor is connected to the refrigerant inlet of the condenser; wherein the high-pressure compressor or the low-pressure compressor includes at least one compressor.

[0009] Furthermore, it also includes: a bypass pipeline, a first end of the bypass pipeline is connected to the suction port of the low-pressure compressor, and a second end of the bypass pipeline is connected to the exhaust port of the high-pressure compressor; a bypass control valve is located on the bypass pipeline, and is used to be turned on when the outdoor environment is a low-temperature environment to bypass the compressor unit.

[0010] Furthermore, it also includes: a low-pressure three-way valve, through which the first end of the bypass line is connected to the intake port of the low-pressure compressor; and a high-pressure three-way valve, through which the second end of the bypass line is connected to the exhaust port of the high-pressure compressor.

[0011] Furthermore, it also includes: an intermediate heat exchanger, the intermediate heat exchanger includes a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet of the intermediate heat exchanger is connected to the exhaust port of the low-pressure compressor, and the first refrigerant outlet of the intermediate heat exchanger is connected to the intake port of the high-pressure compressor; the pipeline between the condenser and the throttling device passes through the intermediate heat exchanger to exchange heat with the refrigerant inside the intermediate heat exchanger.

[0012] Furthermore, the intermediate heat exchanger also includes a second refrigerant inlet; the air-conditioning unit also includes: a throttling branch, one end of which is connected to a second connection point on the pipeline between the condenser and the throttling device, and the other end is connected to the second refrigerant inlet of the intermediate heat exchanger; an intermediate heat exchange throttling valve, located on the throttling branch.

[0013] Furthermore, it also includes: a terminal system, which is a water system, and the circulating water of the water system exchanges heat with the refrigerant in the evaporator.

[0014] Furthermore, it also includes: a terminal system, which is a fluorine system, and the fluorine system directly uses the refrigerant of the air-conditioning unit for heat exchange.

[0015] According to another aspect of an embodiment of the present utility model, there is provided an air conditioning system for a data center, comprising a plurality of air conditioning units as described above arranged in parallel.

[0016] In the utility model, an air conditioning unit is provided, which, in addition to a compressor unit, a condenser, a throttling device and an evaporator, is also provided with a liquid storage tank for storing refrigerant. A fluorine pump branch is also provided, which is arranged in parallel with the throttling device. A fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a spare refrigerant circulation flow path, which is used to exchange heat for the evaporator through the spare refrigerant circulation flow path when the main refrigerant circulation flow path of the air conditioning unit fails. Through the spare refrigerant circulation flow path, the air conditioning unit has redundant equipment, which improves the stability of the air conditioning unit. When the main unit fails and stops, the unit can maintain the cooling capacity required by the data center in a short time, avoid the loss caused by the untimely heat dissipation of the data center, and improve the emergency handling capability of the air conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an optional structural schematic diagram of an air conditioning unit according to an embodiment of the utility model;

[0018] Figure 2 is another optional structural schematic diagram of an air conditioning unit according to an embodiment of the utility model;

[0019] Figure 3 This is an optional structural schematic diagram of a multi-host parallel air conditioning system according to an embodiment of the utility model;

[0020] Figure 4 It is another optional structural schematic diagram of a multi-host parallel air-conditioning system according to an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. High-pressure compressor; 2. Bypass control valve; 3. Low-pressure compressor; 4. Low-pressure three-way valve; 5. Evaporator; 6. Fluorine pump throttle valve; 7. Throttling device; 8. Fluorine pump; 9. Liquid storage tank; 10. Intermediate heat exchanger; 11. Intermediate heat exchange throttle valve; 12. Condenser; 13. High-pressure three-way valve; 14. Water system circulating water pump; 15. Terminal. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0025] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in the embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of the embodiments of the present invention, the first controller may also be referred to as the second controller, and similarly, the second controller may also be referred to as the first controller.

[0027] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0028] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0029] The optional embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] In a preferred embodiment 1 of the present utility model, an air conditioning unit is provided. Specifically, Figure 1 An optional structural diagram of the air conditioning unit is shown, such as Figure 1 As shown, the air conditioning unit includes:

[0032] The compressor unit, condenser, throttling device and evaporator are connected in sequence; the compressor unit, condenser, throttling device and evaporator form a main refrigerant circulation flow path, and when the air-conditioning system is in normal refrigeration operation, the refrigerant circulates in the main refrigerant circulation flow path;

[0033] The liquid storage tank includes a refrigerant inlet, a first refrigerant outlet, and a second refrigerant outlet. The refrigerant inlet of the liquid storage tank is connected to the refrigerant outlet of the condenser, the first refrigerant outlet of the liquid storage tank is connected to the refrigerant inlet of the throttling device, and the second refrigerant outlet of the liquid storage tank is connected to the first connection point on the pipeline between the evaporator and the compressor unit. During normal refrigeration operation, the refrigerant enters from the refrigerant inlet of the liquid storage tank and exits from the first refrigerant outlet of the liquid storage tank. The refrigerant tank stores the refrigerant. When there is a fault in the system, such as a compressor fault or other component fault that causes the main refrigerant circulation flow path to be unable to circulate the refrigerant normally, the liquid storage tank temporarily provides refrigerant for the system. Compared with traditional air-conditioning units, this air-conditioning unit has added a liquid storage system, which increases the stability of the system.

[0034] The fluorine pump branch is arranged in parallel with the throttling device. A fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a backup refrigerant circulation flow path, which is used to exchange heat for the evaporator through the backup refrigerant circulation flow path when the main refrigerant circulation flow path of the air-conditioning unit fails. Since the main refrigerant circulation flow path is suspended and the compressor is turned off, the pressure difference inside the pipeline is small, which is not enough to drive the working fluid to circulate. Therefore, the working fluid stored in the liquid storage tank needs to be powered by the fluorine pump, and the working fluid is circulated by this fluorine pump. Compared with traditional air-conditioning units, this air-conditioning unit has added a fluorine pump system, which increases the flexibility of the system, and the corresponding operating mode can be turned on under different working conditions. In addition, in addition to the backup refrigerant circulation flow path, this air-conditioning unit can also circulate the refrigerant in the flow path composed of the evaporator, compressor, condenser and liquid storage tank through the fluorine pump to exchange heat for the evaporator.

[0035] In the above embodiment, an air conditioning unit is provided, which, in addition to including a compressor unit, a condenser, a throttling device and an evaporator, is also provided with a liquid storage tank for storing refrigerant. At the same time, a fluorine pump branch is also provided, which is arranged in parallel with the throttling device. A fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a spare refrigerant circulation flow path, which is used to exchange heat for the evaporator through the spare refrigerant circulation flow path when the main refrigerant circulation flow path of the air conditioning unit fails. Through the spare refrigerant circulation flow path, the air conditioning unit has redundant equipment, which improves the stability of the air conditioning unit. When the main unit fails and stops, the unit can maintain the cooling capacity required by the data center in a short time, avoid the loss caused by the untimely heat dissipation of the data center, and improve the emergency handling capability of the air conditioning unit.

[0036] like Figure 1As shown, the air conditioning unit also includes: a fluorine pump throttle valve, which is located on the fluorine pump branch. The liquid storage tank is used to collect and store the cooled working fluid, and at the same time, it can provide the working fluid demand for a certain period of time when the main engine fails and stops. The throttling and cooling are carried out through the fluorine pump throttle valve, and the liquid working fluid is converted into a gas-liquid two-phase working fluid.

[0037] In a preferred embodiment of the utility model, the compressor unit includes: a high-pressure compressor and a low-pressure compressor, the air intake of the low-pressure compressor is connected to the refrigerant outlet of the evaporator, the exhaust port of the low-pressure compressor is connected to the air intake of the high-pressure compressor, and the exhaust port of the high-pressure compressor is connected to the refrigerant inlet of the condenser; wherein the high-pressure compressor or the low-pressure compressor includes at least one compressor. The low-pressure compressor is used to perform primary compression on the working fluid in the system. The high-pressure compressor is used to perform secondary compression on the working fluid in the system. The above-mentioned air-conditioning unit can connect multiple series hosts in parallel to expand the system refrigeration capacity and system applicability. A refrigeration system in which two (low-pressure compressors, high-pressure compressors) or more compressors are connected in series to perform two-stage or even multi-stage compression can improve the refrigeration efficiency of the unit, obtain a larger refrigerant flow rate, a lower working fluid temperature, increase the heat exchange temperature difference, and increase the refrigeration capacity of the unit, thereby improving the operating efficiency of the system. At the same time, the unit volume changes less and occupies a smaller area. Therefore, compared with the existing system, the cooling system with multiple compression hosts in series can provide a refrigerant circulation with a larger flow rate and a lower evaporation temperature, thereby improving the system efficiency.

[0038] In order to further improve the efficiency of air conditioning units, such as Figure 1 As shown, the air conditioning unit also includes: a bypass line, the first end of the bypass line is connected to the air intake of the low-pressure compressor, and the second end of the bypass line is connected to the exhaust port of the high-pressure compressor; a bypass control valve is located on the bypass line, which is used to conduct when the outdoor environment is a low-temperature environment to bypass the compressor unit. Under normal circumstances in winter, due to the low temperature of the external environment, the cold supply can be met only by natural heat exchange with the external cold source without starting compression. Therefore, there are bypasses at both ends of multiple compressors. In winter or when the external environment temperature is low, the system uses the external cold source to obtain cold. The bypass control valve is opened when the external environment is low in winter, so that the refrigerant bypasses the host to exchange heat with the external environment, reducing the operating loss of the host and reducing the energy consumption of the system.

[0039] like Figure 1 As shown, it also includes: a low-pressure three-way valve, through which the first end of the bypass line is connected to the air intake of the low-pressure compressor; a high-pressure three-way valve, through which the second end of the bypass line is connected to the exhaust port of the high-pressure compressor. The three-way valve is controlled to realize the switching of the air-conditioning unit operation mode, change the working medium flow path in summer and winter, especially in winter, using the outdoor low temperature environment to improve the energy efficiency ratio of the air-conditioning unit.

[0040] In order to further improve the efficiency of the air conditioning unit, it also includes: an intermediate heat exchanger, the intermediate heat exchanger includes a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet of the intermediate heat exchanger is connected to the exhaust port of the low-pressure compressor, and the first refrigerant outlet of the intermediate heat exchanger is connected to the suction port of the high-pressure compressor; the pipeline between the condenser and the throttling device passes through the intermediate heat exchanger to exchange heat with the refrigerant inside the intermediate heat exchanger. The intermediate heat exchanger is used to cool the working fluid at the outlet of the low-pressure compressor. The intermediate heat exchanger can further improve the heat exchange efficiency and provide a refrigerant cycle with a lower evaporation temperature.

[0041] The intermediate heat exchanger further includes a second refrigerant inlet; the air conditioning unit further includes: a throttling branch, one end of which is connected to a second connection point on the pipeline between the condenser and the throttling device, and the other end is connected to the second refrigerant inlet of the intermediate heat exchanger; an intermediate heat exchange throttling valve is located on the throttling branch. The intermediate heat exchange throttling valve is used to throttle and cool down part of the refrigerant, mix and cool down the refrigerant at the outlet of the low-pressure compressor in the intermediate heat exchanger, and dissipate heat and cool down the refrigerant at the outlet of the condenser.

[0042] Optionally, the air conditioning unit further includes: a terminal system, which is a water system, and the circulating water of the water system exchanges heat with the refrigerant in the evaporator. Figure 1 As shown, a water system circulating water pump is also provided to circulate the terminal water system, and the heat of the machine room is transferred to the water system through the terminal for heat dissipation. At the terminal (water system), the low-temperature working fluid can flow into the evaporator to exchange heat with the circulating water of the water system. In the water system, the water system circulating water pump is used for circulation, and the high-temperature water enters the evaporator, and the low-temperature water flows out of the evaporator and flows into the terminal through the pipeline for circulation.

[0043] In addition, the terminal system can also be a fluorine system. Figure 2 The end of the air conditioner is a fluorine system, and the fluorine system directly uses the refrigerant of the air conditioner for heat exchange. At the end (fluorine system), the low-temperature working fluid does not need to exchange heat with the water system, but flows directly into the end through the pipeline to exchange heat with the end. The working fluid state is transformed from a low-temperature and low-pressure gas-liquid two-phase state to a low-temperature and low-pressure liquid working fluid, and flows back to the low-pressure compressor along the pipeline for working fluid circulation. Figure 2 As shown, when the end is a fluorine system, an evaporator can be used, or an evaporator may not be used and the refrigerant can be circulated directly to the end.

[0044] by Figure 1 Take the following as an example to explain the normal cooling situation in summer:

[0045] First, the working fluid exchanges heat with the water system in the evaporator, and the refrigerant absorbs heat and evaporates, changing from a low-temperature, low-pressure gas-liquid two-phase working fluid to a low-temperature, low-pressure gaseous working fluid. It flows from the evaporator to the low-pressure compressor through the pipeline. In the pipeline, this part of the working fluid is mixed with the gaseous working fluid in the liquid storage tank and enters the low-pressure compressor together. Since it is summer at this time, the external ambient temperature is too high to be used as an environmental cold source. At this time, the three-way valve at the low-pressure end and the three-way valve at the high-pressure end both close the bypass side channel. The low-temperature, low-pressure working fluid passes through the low-pressure compressor and becomes a medium-pressure, high-medium-temperature gaseous working fluid, which flows into the intermediate heat exchanger and is cooled by mixing with the throttling and cooling working fluid. The mixed gas in the intermediate heat exchanger flows into the high-pressure compressor. It flows out from the outlet of the high-pressure compressor and becomes a high-temperature, high-pressure gaseous working fluid. This working fluid flows through the high-pressure end three-way valve into the condenser for cooling, changing from a high-temperature, high-pressure gaseous working fluid to a high-temperature, high-pressure liquid working fluid. This working fluid flows out of the condenser, and a small part flows through the intermediate heat exchange throttle valve for throttling and cooling, becoming the cold source of the intermediate heat exchanger. The cold part flows through the intermediate heat exchanger for secondary cooling. Finally, it flows into the liquid storage tank through the pipeline for collection, storage and supply. In summer, since the low-pressure compressor and the high-pressure compressor are turned on, the pressure difference inside the pipeline is large, which is enough to drive the working fluid to circulate. Therefore, in summer, the working fluid in the liquid storage tank does not need to be powered by a fluorine pump, and can be throttled and cooled by the throttling device by itself, and the high-temperature and high-pressure liquid working fluid is transformed into a low-temperature and low-pressure gas-liquid two-phase working fluid.

[0046] At the end (water system), the low-temperature working fluid can flow into the evaporator to exchange heat with the circulating water in the water system. In the water system, the high-temperature water enters the evaporator through the water system circulating water pump, and the low-temperature water flows out of the evaporator and flows into the end through the pipeline for circulation.

[0047] At the end (fluorine system), the low-temperature working fluid does not need to exchange heat with the water system, but flows directly into the end through the pipeline to exchange heat with the end. The working fluid state is transformed from low-temperature and low-pressure gas-liquid two-phase state to low-temperature and low-pressure liquid working fluid, and flows back to the low-pressure compressor along the pipeline for working fluid circulation.

[0048] by Figure 1 Take this as an example to explain the winter cooling situation:

[0049] Under normal circumstances in winter, due to the low ambient temperature, the cooling capacity can be met only by natural heat exchange with the external environment cold source without starting compression. At this time, the system working medium cycle is: first, the working medium exchanges heat with the water system in the evaporator, and the refrigerant absorbs heat and evaporates, changing from a low-temperature and low-pressure gas-liquid two-phase working medium to a low-temperature and low-pressure gaseous working medium. It flows out of the evaporator through the pipeline, and at the low-pressure three-way valve, the valve is closed and flows through the compressor pipeline, and the bypass pipeline is opened. The refrigerant flows to the compressor bypass through the low-pressure three-way valve. At the same time, the high-pressure three-way valve also closes the compressor direction valve and opens the bypass to the condenser valve. The gaseous working medium flows through the high-pressure three-way valve into the condenser for cooling, and changes from a gaseous working medium to a liquid working medium. This working medium flows out of the condenser and flows through the intermediate heat exchanger. At this time, the intermediate heat exchange throttle valve is in a closed state. Finally, the working medium flows into the liquid storage tank through the pipeline for collection, storage and supply. In winter, since the low-pressure compressor and the high-pressure compressor are closed, the pressure difference inside the pipeline is small, which is not enough to drive the working medium to circulate. Therefore, in summer, the working fluid in the liquid storage tank needs to be powered by a fluorine pump, and throttled and cooled through the throttle valve of the fluorine pump, so that the liquid working fluid is transformed into a gas-liquid two-phase working fluid.

[0050] At the end (water system), the low-temperature working fluid can flow into the evaporator to exchange heat with the circulating water in the water system. In the water system, the high-temperature water enters the evaporator through the water system circulating water pump, and the low-temperature water flows out of the evaporator and flows into the end through the pipeline for circulation.

[0051] At the end (fluorine system), the low-temperature working fluid does not need to exchange heat with the water system, but flows directly into the end through the pipeline to exchange heat with the end. The working fluid state is transformed from low-temperature and low-pressure gas-liquid two-phase state to low-temperature and low-pressure liquid working fluid, flows back to the low-pressure three-way valve along the pipeline, and enters the compressor bypass for working fluid circulation.

[0052] This air conditioning unit can be used in several situations: normal summer conditions, normal winter conditions, host failure in a single system, and host failure in multiple systems. When a host fails, the host can be bypassed through the host-exclusive bypass. The system can throttle and cool the refrigerant in the liquid storage tank through the fluorine pump throttle valve under the action of the fluorine pump, and supply cold air to the terminal for a short time. The system has a non-stop maintenance mechanism, which can increase system safety, ensure the cooling safety of the data center, avoid losses caused by shutdown, and increase the redundancy of the system.

[0053] Example 2

[0054] In a preferred embodiment 2 of the present invention, an air conditioning system for a data center is provided, comprising a plurality of air conditioning units as described above arranged in parallel.

[0055] like Figure 3As shown in the figure, the multi-host parallel system diagram (end water system). In addition to single system operation, this system can also operate multiple systems as follows Figure 3 The system can connect multiple series main units in parallel to expand the system's refrigeration capacity and system applicability.

[0056] like Figure 4 As shown in the figure, the multi-host parallel system diagram (end fluorine system). In addition to single system operation, this system can also be operated by multiple systems as follows Figure 4 The system can connect multiple series main units in parallel to expand the system's refrigeration capacity and system applicability.

[0057] In the above embodiment, an air conditioning unit is provided, which, in addition to including a compressor unit, a condenser, a throttling device and an evaporator, is also provided with a liquid storage tank for storing refrigerant. At the same time, a fluorine pump branch is also provided, which is arranged in parallel with the throttling device. A fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a spare refrigerant circulation flow path, which is used to exchange heat for the evaporator through the spare refrigerant circulation flow path when the main refrigerant circulation flow path of the air conditioning unit fails. Through the spare refrigerant circulation flow path, the air conditioning unit has redundant equipment, which improves the stability of the air conditioning unit. When the main unit fails and stops, the unit can maintain the cooling capacity required by the data center in a short time, avoid the loss caused by the untimely heat dissipation of the data center, and improve the emergency handling capability of the air conditioning unit.

[0058] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed by the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0059] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An air conditioning unit, characterized in that: include: The compressor unit, condenser, throttling device and evaporator are connected in sequence; A liquid storage tank, the liquid storage tank comprising a refrigerant inlet, a first refrigerant outlet, and a second refrigerant outlet, the refrigerant inlet of the liquid storage tank being connected to the refrigerant outlet of the condenser, the first refrigerant outlet of the liquid storage tank being connected to the refrigerant inlet of the throttling device, and the second refrigerant outlet of the liquid storage tank being connected to a first connection point on the pipeline between the evaporator and the compressor unit; A fluorine pump branch is arranged in parallel with the throttling device. A fluorine pump is arranged on the fluorine pump branch. The fluorine pump branch, the liquid storage tank and the evaporator form a backup refrigerant circulation flow path, which is used to exchange heat for the evaporator through the backup refrigerant circulation flow path when the main refrigerant circulation flow path of the air-conditioning unit fails.

2. The air conditioning unit according to claim 1, characterized in that: Also includes: The fluorine pump throttle valve is located on the fluorine pump branch.

3. The air conditioning unit according to claim 1, characterized in that: The compressor unit includes: a high-pressure compressor and a low-pressure compressor, the suction port of the low-pressure compressor is connected to the refrigerant outlet of the evaporator, the exhaust port of the low-pressure compressor is connected to the suction port of the high-pressure compressor, and the exhaust port of the high-pressure compressor is connected to the refrigerant inlet of the condenser; wherein the high-pressure compressor or the low-pressure compressor includes at least one compressor.

4. The air conditioning unit according to claim 3, characterized in that: Also includes: A bypass pipeline, wherein a first end of the bypass pipeline is connected to an air intake port of the low-pressure compressor, and a second end of the bypass pipeline is connected to an air exhaust port of the high-pressure compressor; The bypass control valve is located on the bypass pipeline and is used to bypass the compressor unit when the outdoor environment is a low temperature environment.

5. The air conditioning unit according to claim 4, characterized in that: Also includes: A low-pressure three-way valve, wherein the first end of the bypass line is connected to the suction port of the low-pressure compressor through the low-pressure three-way valve; A high-pressure three-way valve, wherein the second end of the bypass line is connected to the exhaust port of the high-pressure compressor through the high-pressure three-way valve.

6. The air conditioning unit according to claim 3, characterized in that: Also includes: An intermediate heat exchanger, the intermediate heat exchanger comprising a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet of the intermediate heat exchanger being connected to the exhaust port of the low-pressure compressor, and the first refrigerant outlet of the intermediate heat exchanger being connected to the suction port of the high-pressure compressor; The pipeline between the condenser and the throttling device passes through the intermediate heat exchanger to exchange heat with the refrigerant inside the intermediate heat exchanger.

7. The air conditioning unit according to claim 6, characterized in that: The intermediate heat exchanger further includes a second refrigerant inlet; the air conditioning unit further includes: A throttling branch, one end of which is connected to a second connection point on the pipeline between the condenser and the throttling device, and the other end of which is connected to a second refrigerant inlet of the intermediate heat exchanger; The intermediate heat exchange throttle valve is located on the throttling branch.

8. The air conditioning unit according to claim 1, characterized in that: Also includes: The terminal system is a water system, and the circulating water of the water system exchanges heat with the refrigerant in the evaporator.

9. The air conditioning unit according to claim 1, characterized in that: Also includes: The terminal system is a fluorine system, and the fluorine system directly uses the refrigerant of the air-conditioning unit for heat exchange.

10. An air conditioning system for a data center, characterized in that: It comprises a plurality of air conditioning units as claimed in any one of claims 1 to 9 which are arranged in parallel.

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