Refrigerating system and data center

Abstract

The invention relates to a refrigerating system and a data center, and the refrigerating system comprises a compressor, a condenser, a first throttling device and a first evaporator which are sequentially arranged in the circulating direction of a working medium, and further comprises a first gas-liquid separation device, a second gas-liquid separation device and an ejector, a first inlet of the first gas-liquid separation device is connected with an outlet of the condenser, a gas outlet of the first gas-liquid separation device is connected with a gas supplementing opening of the compressor, and a liquid outlet of the first gas-liquid separation device is connected with an inlet of the first throttling device; an inlet of the second gas-liquid separation device is connected to an outlet of the first evaporator, and a gas outlet of the second gas-liquid separation device is connected with an inlet of the compressor; an inlet of the ejector is connected with an outlet of the condenser, an outlet of the ejector is connected with a second inlet of the first gas-liquid separation device, and the inlet of the ejector is connected with a liquid outlet of the second gas-liquid separation device so as to eject a second-state working medium at the liquid outlet of the second gas-liquid separation device through a first-state working medium at the outlet of the condenser.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigeration system and a data center. Background Art

[0002] In modern refrigeration and air conditioning systems, the refrigeration cycle usually relies on a compressor to increase the pressure of the refrigerant so that it can release heat in the condenser, and then reduce the pressure through a throttling device to enter the evaporator to absorb heat. However, in the refrigeration cycle, there are generally problems such as high energy loss, low refrigeration efficiency, and unstable compressor operation.

[0003] It should be noted that the information disclosed in the background technology section of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0004] The present invention provides a refrigeration system and a data center, which can improve the energy utilization efficiency of the refrigeration system and improve the operation stability of the system.

[0005] According to one aspect of the present invention, a refrigeration system is provided, comprising a compressor, a condenser, a first throttling device and a first evaporator arranged in sequence in the circulation direction of the working medium, and the refrigeration system further comprises:

[0006] a first gas-liquid separation device, wherein a first inlet of the first gas-liquid separation device is connected to an outlet of the condenser, a gas outlet of the first gas-liquid separation device is connected to an air supply port of the compressor, and a liquid outlet of the first gas-liquid separation device is connected to an inlet of a first throttling device;

[0007] A second gas-liquid separation device, wherein the inlet of the second gas-liquid separation device is connected to the outlet of the first evaporator, and the gas outlet of the second gas-liquid separation device is connected to the inlet of the compressor; and

[0008] The ejector has an inlet connected to the outlet of the condenser, an outlet connected to the second inlet of the first gas-liquid separation device, and an inlet of the ejector connected to the liquid outlet of the second gas-liquid separation device, so as to inject the second-state working fluid of the liquid outlet of the second gas-liquid separation device through the first-state working fluid of the condenser outlet.

[0009] In the refrigeration cycle, the working fluid coming out of the first evaporator may contain a certain amount of liquid components. The second gas-liquid separation device is set between the first evaporator and the compressor. On the one hand, the second gas-liquid separation device can store liquid working fluid, preventing the liquid part of the working fluid output from the first evaporator from directly entering the compressor and causing the compressor to inhale liquid, thereby protecting the compressor from liquid hammer damage; on the other hand, the second gas-liquid separation device can separate the working fluid into gas and liquid, and connect it to the compressor through the gas outlet, further ensuring that the working fluid entering the compressor is mainly gaseous, improving the operating efficiency and stability of the system.

[0010] In the refrigeration cycle, the first-state working medium at the outlet of the condenser usually includes a high-temperature and high-pressure liquid working medium, and the second-state working medium at the liquid outlet of the second gas-liquid separation device usually includes a low-pressure liquid working medium. The ejector can use the above-mentioned high-temperature and high-pressure liquid working medium to inject the low-pressure liquid working medium, and mix the working medium in these two states to form a medium-pressure liquid working medium to enter the first gas-liquid separation device, and then the first gas-liquid separation device can output a gaseous working medium for replenishing air for the compressor. This design realizes the effective recovery and utilization of energy, and the recovered energy can replenish air for the compressor, reduce its compression ratio, thereby reducing the workload of the compressor, and helping to improve the efficiency of the entire refrigeration cycle.

[0011] In some embodiments, the first gas-liquid separation device comprises a flash evaporator; and / or the second gas-liquid separation device comprises a liquid reservoir.

[0012] The flash evaporator can provide a lower pressure environment, so that the working fluid entering the flash evaporator will have a sudden drop in pressure, thereby quickly forming a two-phase mixture of gas and liquid. The flash evaporator then outputs the gaseous working fluid to the compressor, achieving efficient air replenishment, which helps to improve the efficiency of the refrigeration cycle.

[0013] The liquid receiver is used to store the working fluid output by the first evaporator, and can provide a buffer space for the delivery of the working fluid, which helps to balance the pressure and flow of the system, thereby improving the stability and reliability of the refrigeration cycle.

[0014] In some embodiments, the refrigeration system further comprises:

[0015] A first switch valve is disposed between the condenser and the first gas-liquid separation device and is configured to control the on-off of a connecting pipeline between the outlet of the condenser and the first inlet of the first gas-liquid separation device; and / or

[0016] The second switch valve is disposed between the second gas-liquid separation device and the ejector, and is configured to control the on-off of the connecting pipeline between the liquid outlet of the second gas-liquid separation device and the inlet of the ejector.

[0017] By controlling the opening and closing of the first switch valve, the connection and disconnection of the connecting pipeline between the outlet of the condenser and the first inlet of the first gas-liquid separation device can be controlled. By controlling the opening and closing of the second switch valve, the connection and disconnection of the connecting pipeline between the liquid outlet of the second gas-liquid separation device and the inlet of the ejector can be controlled. Here, the opening and closing of the first switch valve and the second switch valve can be coordinated and controlled according to the actual needs during the operation of the refrigeration system to improve the working flexibility and adaptability of the refrigeration system.

[0018] In some embodiments, the first switch valve and the second switch valve are configured as:

[0019] When the liquid working medium content at the outlet of the first evaporator is less than a first preset value and / or the liquid working medium content in the second gas-liquid separation device is less than a second preset value, the first switch valve is opened and the second switch valve is closed; and

[0020] When the liquid working medium content at the outlet of the first evaporator is greater than or equal to a first preset value and the liquid working medium content in the second gas-liquid separation device is greater than or equal to a second preset value, the first switch valve is closed and the second switch valve is opened.

[0021] Based on this, the opening and closing states of the first switch valve and the second switch valve are dynamically adjusted according to the real-time content of the liquid working medium, thereby being able to control whether to use the ejector for injection. This arrangement can ensure that the ejector is enabled only when conditions are appropriate (for example, when a sufficient amount of liquid working medium is stored in the second gas-liquid separation device), for example, ensuring that the ejector is activated when there is sufficient liquid working medium reserve, which can not only improve the injection effect, but also reduce the number of unnecessary ejector activations and save energy.

[0022] In some embodiments, the refrigeration system also includes a detector, which is configured to detect the liquid working fluid content at the outlet of the first evaporator and / or the liquid working fluid content in the second gas-liquid separation device, and the first switch valve and the second switch valve are coupled to the detector to open or close according to the liquid working fluid content at the outlet of the first evaporator and / or the liquid working fluid content in the second gas-liquid separation device detected by the detector.

[0023] The detector can detect the real-time data of the liquid working medium content, so that the first switch valve and the second switch valve can timely adjust their own opening and closing states according to the real-time data detected by the detector, so that the pressure and flow of the working medium in the system are maintained in a relatively stable state. In this way, the opening and closing timing of the first switch valve and the second switch valve are flexibly adjusted based on the liquid working medium content, which, on the one hand, enables the ejector to maintain a more efficient operating state at startup, and on the other hand, helps to improve the system's real-time adjustment capability and working condition adaptability.

[0024] In some embodiments, the detector comprises a refrigerant analyzer.

[0025] The refrigerant analyzer can detect the composition of the working fluid at the outlet of the first evaporator and in the second gas-liquid separation device, including but not limited to the temperature, pressure, ratio of liquid working fluid to gaseous working fluid, etc. The refrigerant analyzer can provide relatively comprehensive information about the working fluid relatively quickly and accurately, which helps to improve the efficiency and automation of the refrigeration system control.

[0026] In some embodiments, the refrigeration system further includes a second evaporator connected between the liquid outlet of the second gas-liquid separation device and the inlet of the ejector.

[0027] By setting up a second evaporator, a different evaporation temperature from that of the first evaporator can be achieved, thereby expanding the application range of the refrigeration system. For example, the first evaporator can be used to handle cooling requirements in a first temperature range (such as refrigeration), while the second evaporator can be used to handle cooling requirements in a second temperature range different from the first temperature range (such as air conditioning). In addition, the setting of dual evaporators can reduce the average heat exchange temperature difference of the evaporators in the system, which can reduce system energy consumption and improve system performance.

[0028] In some embodiments, the refrigeration system further includes a second throttling device connected between the second gas-liquid separation device and the second evaporator.

[0029] The liquid working medium stored in the second gas-liquid separation device is throttled and depressurized by the second throttling device, so as to prepare for the evaporation process of the working medium entering the second evaporator. By adjusting the throttling degree of the second throttling device, the flow rate and speed of the liquid working medium entering the second evaporator can be controlled, which helps to achieve flexible regulation of its evaporation process. Based on this, the refrigeration cycles in which the first evaporator and the second evaporator participate can be independently and flexibly controlled, which helps to meet diverse cooling requirements.

[0030] In some embodiments, the compressor comprises a two-stage compressor or a multi-stage compressor.

[0031] Compared with a single compressor, a two-stage compressor or a multi-stage compressor allows each compressor to operate at a lower compression ratio, thereby reducing the overheating problem that may occur during single-stage compression and improving the overall compression efficiency. In addition, since the compression ratio of each stage of the compressor is relatively small, the pressure and temperature changes experienced by the internal components of the compressor are relatively mild, which can reduce the risk of failure and extend the life of the equipment.

[0032] According to another aspect of the present invention, a data center is provided, comprising a server and the above-mentioned refrigeration system, wherein a first evaporator of the refrigeration system is used to cool the server.

[0033] Based on this, the servers in the data center can be cooled down in a timely manner, ensuring the service continuity and reliability of the data center. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 A schematic structural diagram of an embodiment of a refrigeration system of the present invention is shown.

[0036] Figure 2 A structural schematic diagram of another embodiment of the refrigeration system of the present invention is shown.

[0037] In the figure:

[0038] 1a, first-stage compressor; 1b, second-stage compressor; 2, condenser; 3, ejector; 4, first evaporator; 5, second gas-liquid separation device; 6, first gas-liquid separation device; 7a, first switch valve; 7b, second switch valve; 8a, first throttling device; 8b, second throttling device; 9, second evaporator; 10, detector. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. 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.

[0040] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be understood as limiting the scope of protection of the present invention.

[0041] refer to Figure 1As shown, in some embodiments of the refrigeration system provided by the present invention, the refrigeration system includes a compressor, a condenser 2, a first throttling device 8a and a first evaporator 4 arranged in sequence in the circulation direction of the working medium, and the refrigeration system also includes a first gas-liquid separation device 6, a second gas-liquid separation device 5 and an ejector 3. Among them, the first inlet of the first gas-liquid separation device 6 is connected to the outlet of the condenser 2, the gas outlet of the first gas-liquid separation device 6 is connected to the air supply port of the compressor, and the liquid outlet of the first gas-liquid separation device 6 is connected to the inlet of the first throttling device 8a; the inlet of the second gas-liquid separation device 5 is connected to the outlet of the first evaporator 4, and the gas outlet of the second gas-liquid separation device 5 is connected to the inlet of the compressor; the inlet of the ejector 3 is connected to the outlet of the condenser 2, the outlet of the ejector 3 is connected to the second inlet of the first gas-liquid separation device 6, and the inlet of the ejector 3 is connected to the liquid outlet of the second gas-liquid separation device 5, so as to eject the second state working medium of the liquid outlet of the second gas-liquid separation device 5 through the first state working medium of the outlet of the condenser 2.

[0042] It can be understood that the working fluid in the refrigeration system in the embodiment of the present invention is also called refrigerant. The refrigerant is a substance used to absorb and release heat in the refrigeration cycle, and realizes the transfer of heat energy through phase change (conversion between liquid and gas).

[0043] Here, the first gas-liquid separation device 6 and the second gas-liquid separation device 5 are both configured as devices having a gas-liquid separation function. The first throttling device 8a may specifically be a throttling valve, an expansion valve, and the like.

[0044] In the refrigeration cycle, the working fluid coming out of the first evaporator 4 may contain certain liquid components. The second gas-liquid separation device 5 is arranged between the first evaporator 4 and the compressor. On the one hand, the second gas-liquid separation device 5 can store liquid working fluid, preventing the liquid part of the working fluid output by the first evaporator 4 from directly entering the compressor and causing the compressor to inhale liquid, thereby protecting the compressor from liquid hammer damage; on the other hand, the second gas-liquid separation device 5 can separate the working fluid into gas and liquid, and connect it to the compressor through the gas outlet, further ensuring that the working fluid entering the compressor is mainly gaseous, thereby improving the operating efficiency and stability of the system.

[0045] In the refrigeration cycle, the first-state working medium at the outlet of the condenser 2 usually includes a high-temperature and high-pressure liquid working medium, and the second-state working medium at the liquid outlet of the second gas-liquid separation device 5 usually includes a low-pressure liquid working medium. The ejector 3 can use the above-mentioned high-temperature and high-pressure liquid working medium to inject the low-pressure liquid working medium, and mix the working medium in these two states to form a medium-pressure liquid working medium to enter the first gas-liquid separation device 6, and then the first gas-liquid separation device 6 can output a gaseous working medium for replenishing air for the compressor. This design realizes the effective recycling of energy, and the recycled energy can replenish air for the compressor, reduce its compression ratio, thereby reducing the workload of the compressor, and helping to improve the efficiency of the entire refrigeration cycle.

[0046] In some embodiments, the first gas-liquid separation device 6 includes a flash evaporator; and / or the second gas-liquid separation device 5 includes a liquid storage device.

[0047] The flash evaporator can provide a lower pressure environment, so that the working fluid entering the flash evaporator will have a sudden drop in pressure, thereby quickly forming a two-phase mixture of gas and liquid. The flash evaporator then outputs the gaseous working fluid to the compressor, achieving efficient air replenishment, which helps to improve the efficiency of the refrigeration cycle.

[0048] The liquid storage device is used to store the working fluid output by the first evaporator 4, and can provide a buffer space for the delivery of the working fluid, which helps to balance the pressure and flow of the system, thereby improving the stability and reliability of the refrigeration cycle.

[0049] refer to Figure 1 and Figure 2 As shown, in some embodiments, the refrigeration system further includes a first switch valve 7a and / or a second switch valve 7b. The first switch valve 7a is disposed between the condenser 2 and the first gas-liquid separation device 6. The first switch valve 7a is configured to control the on-off of the connecting pipeline between the outlet of the condenser 2 and the first inlet of the first gas-liquid separation device 6. The second switch valve 7b is disposed between the second gas-liquid separation device 5 and the ejector 3. The second switch valve 7b is configured to control the on-off of the connecting pipeline between the liquid outlet of the second gas-liquid separation device 5 and the inlet of the ejector 3.

[0050] By controlling the opening and closing of the first switch valve 7a, the connection and disconnection of the connecting pipeline between the outlet of the condenser 2 and the first inlet of the first gas-liquid separation device 6 can be controlled. By controlling the opening and closing of the second switch valve 7b, the connection and disconnection of the connecting pipeline between the liquid outlet of the second gas-liquid separation device 5 and the inlet of the ejector 3 can be controlled. Here, the opening and closing of the first switch valve 7a and the second switch valve 7b can be coordinated and controlled according to the actual needs during the operation of the refrigeration system to improve the working flexibility and adaptability of the refrigeration system.

[0051] In some embodiments, the first switch valve 7a and the second switch valve 7b are configured as follows: when the liquid working fluid content at the outlet of the first evaporator 4 is less than a first preset value and / or the liquid working fluid content in the second gas-liquid separation device 5 is less than a second preset value, the first switch valve 7a is opened and the second switch valve 7b is closed; and when the liquid working fluid content at the outlet of the first evaporator 4 is greater than or equal to the first preset value and the liquid working fluid content in the second gas-liquid separation device 5 is greater than or equal to the second preset value, the first switch valve 7a is closed and the second switch valve 7b is opened.

[0052] Based on this, the opening and closing states of the first switch valve 7a and the second switch valve 7b are dynamically adjusted according to the real-time content of the liquid working medium, and then whether to use the injector 3 for injection can be controlled. This arrangement can ensure that the injector 3 is enabled only when the conditions are appropriate (for example, when a sufficient amount of liquid working medium is stored in the second gas-liquid separation device 5), for example, the injector 3 is enabled when there is a sufficient reserve of liquid working medium, which can not only improve the injection effect, but also reduce the number of unnecessary starts of the injector 3 and save energy consumption.

[0053] In a specific example, the liquid working medium content in the second gas-liquid separation device 5 is less than the second preset value, and the first switch valve 7a is opened and the second switch valve 7b is closed. In this case, the circuit where the ejector 3 is located does not work, and the flow path of the working medium is: compressor → condenser 2 → first switch valve 7a → first gas-liquid separation device 6 → first evaporator 4 → second gas-liquid separation device 5 → compressor. For reference, the second preset value is set to 5% of the capacity of the second gas-liquid separation device 5.

[0054] In another specific example, the liquid working fluid content at the outlet of the first evaporator 4 is greater than or equal to the first preset value and the liquid working fluid content in the second gas-liquid separation device 5 is greater than or equal to the second preset value. At this time, the first switch valve 7a is closed and the second switch valve 7b is opened. In this case, the ejector 3 works, and the flow path of the working fluid is: the high-temperature and high-pressure gaseous working fluid discharged by the compressor enters the condenser 2 for heat exchange with the cooling medium, releases heat and condenses into a high-temperature and high-pressure liquid working fluid, and then enters the ejector 3 for expansion and pressure reduction, and ejects the low-pressure liquid working fluid at the liquid outlet of the second gas-liquid separation device 5. The two are fully mixed in the ejector 3 to form a medium-pressure liquid working fluid that enters the first gas-liquid separation device 6. The gaseous working fluid at the outlet of the first gas-liquid separation device 6 is used for intermediate air replenishment of the compressor. The liquid working fluid at the outlet of the first gas-liquid separation device 6 enters the second gas-liquid separation device 5 after entering the first evaporator 4, and the gaseous working fluid at the gas outlet of the second gas-liquid separation device 5 returns to the compressor to complete the cycle.

[0055] refer to Figure 1 and Figure 2As shown, in some embodiments, the refrigeration system further includes a detector 10. The detector 10 is configured to detect the liquid working medium content at the outlet of the first evaporator 4 and / or the liquid working medium content in the second gas-liquid separation device 5, and the first switch valve 7a and the second switch valve 7b are coupled to the detector 10 to open or close according to the liquid working medium content at the outlet of the first evaporator 4 and / or the liquid working medium content in the second gas-liquid separation device 5 detected by the detector 10.

[0056] The detector 10 can detect the real-time data of the liquid working medium content, so that the first switch valve 7a and the second switch valve 7b can timely adjust their own opening and closing states according to the real-time data detected by the detector 10, so that the pressure and flow rate of the working medium in the system are maintained in a relatively stable state. In this way, the opening and closing timing of the first switch valve 7a and the second switch valve 7b are flexibly adjusted based on the liquid working medium content, which, on the one hand, enables the injector 3 to maintain a more efficient operating state when starting, and on the other hand, helps to improve the real-time adjustment capability and working condition adaptability of the system.

[0057] The detector 10 may include a pressure sensor and a temperature sensor, so that the content of the working fluid can be obtained based on the pressure and temperature data detected in real time.

[0058] In some embodiments, detector 10 comprises a refrigerant analyzer.

[0059] The refrigerant analyzer can detect the composition of the working fluid at the outlet of the first evaporator 4 and in the second gas-liquid separation device 5, including but not limited to the temperature, pressure, ratio of liquid working fluid to gaseous working fluid, etc. The refrigerant analyzer can provide relatively comprehensive information about the working fluid relatively quickly and accurately, which helps to improve the efficiency and automation of the refrigeration system control.

[0060] refer to Figure 2 As shown, in some embodiments, the refrigeration system further includes a second evaporator 9 , which is connected between the liquid outlet of the second gas-liquid separation device 5 and the inlet of the ejector 3 .

[0061] By setting the second evaporator 9, an evaporation temperature different from that of the first evaporator 4 can be achieved, thereby expanding the application range of the refrigeration system. For example, the first evaporator 4 can be used to handle cooling requirements in a first temperature range (e.g., refrigeration), while the second evaporator 9 can be used to handle cooling requirements in a second temperature range different from the first temperature range (e.g., air conditioning). In addition, the setting of the dual evaporators can reduce the average heat exchange temperature difference of the evaporators in the system, thereby reducing system energy consumption and improving system performance.

[0062] Here, the working fluid entering the second evaporator 9 comes from the liquid outlet of the second gas-liquid separation device 5 and is a liquid working fluid. Compared with the system instability caused by flow and pressure fluctuations caused by gas-liquid two-phase working fluid entering the evaporator in the related technology, the present invention can effectively improve the stability of the system.

[0063] refer to Figure 2 As shown, in some embodiments, the refrigeration system further includes a second throttling device 8b, and the second throttling device 8b is connected between the second gas-liquid separation device 5 and the second evaporator 9.

[0064] The liquid working medium stored in the second gas-liquid separation device 5 is throttled and depressurized by the second throttling device 8b, so as to prepare for the evaporation process of the working medium entering the second evaporator 9. By adjusting the throttling degree of the second throttling device 8b, the flow rate and speed of the liquid working medium entering the second evaporator 9 can be controlled, which helps to achieve flexible regulation of its evaporation process. Based on this, the refrigeration cycles in which the first evaporator 4 and the second evaporator 9 participate can be independently and flexibly controlled, which helps to meet diverse cooling requirements.

[0065] Here, the second throttling device 8b may specifically be a throttling valve, an expansion valve, etc.

[0066] In some embodiments, the compressor comprises a two-stage compressor or a multi-stage compressor.

[0067] Compared with a single compressor, a two-stage compressor or a multi-stage compressor allows each compressor to operate at a lower compression ratio, thereby reducing the overheating problem that may occur during single-stage compression and improving the overall compression efficiency. In addition, since the compression ratio of each stage of the compressor is relatively small, the pressure and temperature changes experienced by the internal components of the compressor are relatively mild, which can reduce the risk of failure and extend the life of the equipment.

[0068] refer to Figure 1 As shown, in a specific example, the compressor includes a first-stage compressor 1a and a second-stage compressor 1b, and in the circulation direction of the working medium, the second-stage compressor 1b is arranged downstream of the first-stage compressor 1a. In this case, the gas outlet of the first gas-liquid separation device 6 can be connected to the gas replenishment port of the second-stage compressor 1b to replenish gas to the second-stage compressor 1b.

[0069] Next, two specific embodiments of the refrigeration system of the present invention are described by taking a single evaporator system and a dual evaporator system as examples.

[0070] In the following two embodiments, the compressor is configured as a two-stage compressor, which includes a first-stage compressor 1a and a second-stage compressor 1b arranged in sequence in the circulation direction of the working medium, wherein the first-stage compressor 1a serves as a low-pressure compressor and the second-stage compressor 1b serves as a high-pressure compressor. Embodiment 1:

[0071] refer to Figure 1 As shown, in this embodiment, the refrigeration system includes a first-stage compressor 1a, a second-stage compressor 1b, a condenser 2, a first throttling device 8a and a first evaporator 4 which are arranged in sequence in the circulation direction of the working medium, and the refrigeration system also includes a first gas-liquid separation device 6, a second gas-liquid separation device 5, an ejector 3 and a detector 10.

[0072] Among them, the first inlet of the first gas-liquid separation device 6 is connected to the outlet of the condenser 2, the gas outlet of the first gas-liquid separation device 6 is connected to the gas replenishment port of the second-stage compressor 1b, and the liquid outlet of the first gas-liquid separation device 6 is connected to the inlet of the first throttling device 8a. The inlet of the second gas-liquid separation device 5 is connected to the outlet of the first evaporator 4, and the gas outlet of the second gas-liquid separation device 5 is connected to the inlet of the first-stage compressor 1a. The inlet of the ejector 3 is connected to the outlet of the condenser 2, the outlet of the ejector 3 is connected to the second inlet of the first gas-liquid separation device 6, and the inlet of the ejector 3 is connected to the liquid outlet of the second gas-liquid separation device 5, so as to inject the second-state working medium of the liquid outlet of the second gas-liquid separation device 5 through the first-state working medium at the outlet of the condenser 2. The detector 10 is arranged between the first evaporator 4 and the second gas-liquid separation device 5, and is used to detect the liquid working medium content at the outlet of the first evaporator 4 and the liquid working medium content in the second gas-liquid separation device 5.

[0073] In addition, the refrigeration system also includes a first switch valve 7a and a second switch valve 7b. The first switch valve 7a is arranged between the condenser 2 and the first gas-liquid separation device 6 to control the on-off of the connecting pipeline between the outlet of the condenser 2 and the first inlet of the first gas-liquid separation device 6; the second switch valve 7b is arranged between the second gas-liquid separation device 5 and the ejector 3 to control the on-off of the connecting pipeline between the liquid outlet of the second gas-liquid separation device 5 and the inlet of the ejector 3.

[0074] In this embodiment, the first gas-liquid separation device 6 is a flash evaporator, the second gas-liquid separation device 5 is a liquid storage device, and the detector 10 is a refrigerant analyzer.

[0075] When the refrigeration system is running, the high-temperature and high-pressure gaseous working medium discharged from the second-stage compressor 1b enters the condenser 2 for heat exchange with the cooling medium, releases heat and condenses into a high-temperature and high-pressure liquid working medium, and then enters the inlet of the ejector 3 for expansion and pressure reduction, and ejects the low-pressure liquid working medium at the outlet of the liquid reservoir 5. The working medium in the two states is fully mixed in the ejector 3 to form a medium-pressure liquid working medium and enters the flash evaporator 6. The gaseous working medium at the outlet of the flash evaporator 6 is used for intermediate air replenishment of the second-stage compressor 1b. The liquid working medium at the outlet of the flash evaporator 6 enters the first evaporator 4 after throttling and pressure reduction by the first throttling device 8a to complete phase change refrigeration, and then enters the liquid reservoir 5. The gaseous working medium at the outlet of the liquid reservoir 5 returns to the first-stage compressor 1a to complete the cycle.

[0076] When the refrigerant analyzer 10 detects that the liquid content in the working fluid at the outlet of the first evaporator 4 is low and the liquid working fluid content in the liquid reservoir 5 is lower than 5% of the liquid reservoir capacity, the first switch valve 7a is opened and the second switch valve 7b is closed. At this time, the path of the working fluid is: second-stage compressor 1b→condenser 2→first switch valve 7a→flash evaporator 6→first throttling device 8a→first evaporator 4→liquid reservoir 5→first-stage compressor 1a, wherein the gaseous working fluid output by the flash evaporator 6 is used for intermediate air replenishment of the second-stage compressor 1b. Embodiment 2:

[0077] refer to Figure 2 As shown, different from the above-mentioned embodiment 1, the refrigeration system in this embodiment further includes a second throttling device 8b and a second evaporator 9 arranged between the second switch valve 7b and the ejector 3.

[0078] When the refrigeration system is running, the high-temperature and high-pressure gaseous working medium discharged from the second-stage compressor 1b enters the condenser 2 for heat exchange with the cooling medium, releases heat and condenses into a high-temperature and high-pressure liquid working medium, and then enters the inlet of the ejector 3 for expansion and pressure reduction, and ejects the low-pressure gaseous working medium at the outlet of the second evaporator 9. The working medium in the two states is fully mixed in the ejector 3 to form a medium-pressure gas-liquid two-phase working medium and enters the flash evaporator 6. The gaseous working medium at the outlet of the flash evaporator 6 is used for intermediate air replenishment of the second-stage compressor 1b. The liquid working medium at the outlet of the flash evaporator 6 enters the first evaporator 4 after throttling and reducing the pressure by the first throttling device 8a to complete phase change refrigeration, and then enters the liquid reservoir 5. The liquid working medium at the outlet of the liquid reservoir 5 enters the second evaporator 9 after throttling and reducing the pressure by the second throttling device 8b to complete phase change refrigeration. The gaseous working medium at the outlet of the liquid reservoir 5 returns to the first-stage compressor 1a to complete the cycle.

[0079] When the refrigerant analyzer 10 detects that the liquid content in the working fluid at the outlet of the first evaporator 4 is low and the liquid working fluid content in the liquid storage tank 5 is lower than 5% of the liquid storage tank capacity, the first switch valve 7a is opened, the second switch valve 7b is closed, and the second evaporator 9 stops running. In this case, the structure of the refrigeration system of Example 2 is the same as that in the above-mentioned Example 1.

[0080] Based on the above refrigeration system, the present invention further proposes a data center, which includes a server and the above refrigeration system, wherein the first evaporator 4 of the refrigeration system is used to cool the server. The second evaporator 9 of the refrigeration system can also be used for heat dissipation or cooling of other equipment in the data center, and can be set according to actual needs.

[0081] Based on this, the servers and other heat generating devices in the data center of the present invention can be cooled down in time, thus ensuring the service continuity and reliability of the data center. In addition, since the refrigeration system can realize energy recycling and improve the efficiency of its refrigeration cycle, the data center of the present invention can also meet the design requirements of modern data centers for low energy consumption and sustainable development.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A refrigeration system, comprising a compressor, a condenser (2), a first throttling device (8a) and a first evaporator (4) arranged in sequence in the circulation direction of a working medium, characterized in that: Also includes: a first gas-liquid separation device (6), wherein a first inlet of the first gas-liquid separation device (6) is connected to an outlet of the condenser (2), a gas outlet of the first gas-liquid separation device (6) is connected to an air supply port of the compressor, and a liquid outlet of the first gas-liquid separation device (6) is connected to an inlet of the first throttling device (8a); a second gas-liquid separation device (5), wherein the inlet of the second gas-liquid separation device (5) is connected to the outlet of the first evaporator (4), and the gas outlet of the second gas-liquid separation device (5) is connected to the inlet of the compressor; and An ejector (3), wherein the inlet of the ejector (3) is connected to the outlet of the condenser (2), the outlet of the ejector (3) is connected to the second inlet of the first gas-liquid separation device (6), and the inlet of the ejector (3) is connected to the liquid outlet of the second gas-liquid separation device (5), so as to eject the second-state working medium at the liquid outlet of the second gas-liquid separation device (5) through the first-state working medium at the outlet of the condenser (2).

2. The refrigeration system according to claim 1, characterized in that: The first gas-liquid separation device (6) comprises a flash evaporator; and / or The second gas-liquid separation device (5) comprises a liquid storage device.

3. The refrigeration system according to claim 1, characterized in that: Also includes: a first switch valve (7a), arranged between the condenser (2) and the first gas-liquid separation device (6), and configured to control the on-off of a connecting pipeline between an outlet of the condenser (2) and a first inlet of the first gas-liquid separation device (6); and / or The second switch valve (7b) is arranged between the second gas-liquid separation device (5) and the injector (3), and is configured to control the on-off of the connecting pipeline between the liquid outlet of the second gas-liquid separation device (5) and the inlet of the injector (3).

4. The refrigeration system according to claim 3, characterized in that: The first switch valve (7a) and the second switch valve (7b) are configured as follows: When the liquid working medium content at the outlet of the first evaporator (4) is less than a first preset value and / or the liquid working medium content in the second gas-liquid separation device (5) is less than a second preset value, the first switch valve (7a) is opened and the second switch valve (7b) is closed; and When the liquid working medium content at the outlet of the first evaporator (4) is greater than or equal to the first preset value and the liquid working medium content in the second gas-liquid separation device (5) is greater than or equal to the second preset value, the first switch valve (7a) is closed and the second switch valve (7b) is opened.

5. The refrigeration system according to claim 4, characterized in that: The device further comprises a detector (10), wherein the detector (10) is configured to detect the liquid working medium content at the outlet of the first evaporator (4) and / or the liquid working medium content in the second gas-liquid separation device (5); the first switch valve (7a) and the second switch valve (7b) are coupled to the detector (10) to open or close according to the liquid working medium content at the outlet of the first evaporator (4) and / or the liquid working medium content in the second gas-liquid separation device (5) detected by the detector (10).

6. The refrigeration system according to claim 5, characterized in that: The detector (10) comprises a refrigerant analyzer.

7. The refrigeration system according to any one of claims 1 to 6, characterized in that: It also comprises a second evaporator (9), wherein the second evaporator (9) is connected between the liquid outlet of the second gas-liquid separation device (5) and the inlet of the ejector (3).

8. The refrigeration system according to claim 7, characterized in that: It also includes a second throttling device (8b), wherein the second throttling device (8b) is connected between the second gas-liquid separation device (5) and the second evaporator (9).

9. The refrigeration system according to any one of claims 1 to 6, characterized in that: The compressor includes a two-stage compressor or a multi-stage compressor.

10. A data center, characterized in that: The refrigeration system comprises a server and the refrigeration system according to any one of claims 1 to 9, wherein the first evaporator (4) of the refrigeration system is used to cool the server.

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