Refrigeration system and test sorting equipment
By designing first and second closed loops in the refrigeration system and using refrigerant storage and controllable valves to regulate the refrigerant circulation, the problem of excessively high load evaporator temperature during high-temperature thermal stress was solved, achieving stable temperature control under high-temperature conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU CHANGCHUAN TECH CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-04-28
AI Technical Summary
In existing refrigeration systems, the load evaporator absorbs too much heat during high-temperature thermal stress, leading to excessively high liquid discharge temperature, which damages the compressor. Furthermore, the cooling of the bypass branch weakens the cooling capacity of the main circuit, affecting the temperature control effect.
Design a refrigeration system comprising first and second closed loops, wherein the refrigerant circulation volume is regulated by a refrigerant storage device and a controllable valve to ensure sufficient refrigerant supply under high-temperature conditions, thereby preventing the evaporator temperature from becoming too high and reducing damage to the compressor.
This effectively avoids the problem of excessively high evaporator temperature under high-temperature conditions, ensuring that the refrigeration system provides sufficient refrigerant at high temperatures and improving the temperature control effect of electronic components.
Smart Images
Figure CN224175360U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of temperature control technology, and in particular to a refrigeration system and a testing and sorting device. Background Technology
[0002] Electronic components undergo testing on sorting and testing equipment before leaving the factory to assess their stability and reliability under high and low temperature conditions. This equipment includes a refrigeration system and a heating system. The refrigeration system acts as a cold source, and the heating system as a heat source. The cold and heat sources work together to control the temperature of the electronic components at high and low temperatures. Generally, the refrigerant charge in the refrigeration system is predetermined through testing, so the system does not require further refrigerant charging or discharging during normal operation.
[0003] For refrigeration systems with load evaporators that require both low-temperature and high-temperature thermal resistance, a single main loop can ensure normal system operation at low temperatures. However, during high-temperature thermal resistance, the load evaporator absorbs excessive heat, leading to excessively high discharge temperatures. This can cause irreversible damage to the compressor. To address this issue, a bypass branch is typically introduced to cool the compressor return gas.
[0004] However, because the refrigerant in the bypass branch needs to return gas to the compressor for cooling, it weakens the cooling capacity of the main circuit, which has an adverse effect on temperature control. Utility Model Content
[0005] Therefore, it is necessary to provide a refrigeration system and testing and sorting equipment that can improve the above problems.
[0006] A refrigeration system includes a first refrigeration module, the first refrigeration module including a first compressor, a first condenser, a throttling mechanism and a load evaporator, wherein the first compressor, the first condenser, at least a portion of the throttling mechanism and the load evaporator are sequentially connected to form a first closed loop;
[0007] The first refrigeration module further includes a refrigerant storage device for storing refrigerant, the refrigerant storage device having an inlet end and an outlet end, both of which can be controllably connected to or disconnected from the first closed loop;
[0008] When both the inlet and outlet are connected to the first closed loop, the first compressor, the first condenser, at least a portion of the throttling mechanism, the load evaporator, and the refrigerant storage unit are connected to form a second closed loop to increase the refrigerant circulation volume of the first refrigeration module.
[0009] In one embodiment, the refrigerant circulation volume of the second closed loop is greater than that of the first closed loop.
[0010] In one embodiment, the first refrigeration module includes a main circuit and two branch circuits, both ends of which are connected to the main circuit. The first compressor, the first condenser, and the load evaporator are located on the main circuit.
[0011] The throttling mechanism includes a first throttling element and a second throttling element, wherein the first throttling element is disposed on one of the branches, and the second throttling element and the refrigerant storage device are disposed on the other branch;
[0012] The first compressor, the first condenser, the first throttling element, and the load evaporator are sequentially connected to form the first closed loop;
[0013] The first compressor, the first condenser, the second throttling device, the load evaporator, and the refrigerant storage are connected to form the second closed loop.
[0014] In one embodiment, the first compressor, the first condenser, the refrigerant storage device, the second throttling device, and the load evaporator are sequentially connected to form the second closed loop;
[0015] The first refrigeration module further includes a first on / off valve, which is used to control the connection and disconnection between the inlet end and the first closed circuit.
[0016] In one embodiment, the controllable flow range of the second throttling element is greater than the controllable flow range of the first throttling element.
[0017] In one embodiment, the first refrigeration module includes a main circuit and two branch circuits, both ends of which are connected to the main circuit. The first compressor, the first condenser, and the load evaporator are located on the main circuit. The throttling mechanism includes a third throttling element located on the main circuit. A second on / off valve is provided on one branch circuit, and the refrigerant storage device and the third on / off valve are provided on the other branch circuit.
[0018] The first compressor, the first condenser, the third throttling element, and the load evaporator are sequentially connected to form the first closed loop;
[0019] The first compressor, the first condenser, the third throttling element, the refrigerant storage device, and the load evaporator are connected to form the second closed loop.
[0020] In one embodiment, the controllable flow range of the third on / off valve is greater than that of the second on / off valve.
[0021] In one embodiment, the first refrigeration module further includes a first temperature sensor and a first pressure sensor, wherein the first temperature sensor is used to detect the temperature at the return gas end of the first compressor, and the first pressure sensor is used to detect the pressure at the return gas end of the first compressor.
[0022] and / or
[0023] The first refrigeration module further includes a second temperature sensor and a second pressure sensor. The second temperature sensor is used to detect the temperature at the discharge end of the first compressor, and the second pressure sensor is used to detect the pressure at the discharge end of the first compressor.
[0024] In one embodiment, the refrigeration system further includes a cooling module thermally coupled to the first condenser for heat dissipation from the first condenser.
[0025] In one embodiment, the refrigeration system includes a second refrigeration module, which serves as the cooling module;
[0026] The second refrigeration module includes a second compressor, a second condenser, and a fourth throttling device. The second compressor, the second condenser, the fourth throttling device, and the first condenser are sequentially connected to form a third closed loop. The third closed loop is thermally coupled to both the first and second closed loops through the first condenser, which is an evaporative condenser.
[0027] A testing and sorting device includes the aforementioned refrigeration system.
[0028] The aforementioned refrigeration system and testing and sorting equipment can control the operation of the first and second closed loops according to the requirements of high and low temperature conditions, avoiding the problem of excessively high discharge temperature of the load evaporator under high temperature conditions, thereby reducing the damage to the first compressor. Furthermore, compared to the existing technology that uses a bypass branch to cool the compressor return gas, this ensures that the refrigeration system can provide sufficient refrigerant for heat exchange between the load evaporator and electronic components under high temperature conditions, thereby reducing temperature fluctuations in the load evaporator and improving the temperature control effect on electronic components. Attached Figure Description
[0029] Figure 1 This is a structural diagram of a refrigeration system provided in one embodiment of this application;
[0030] Figure 2 This is a structural diagram of a refrigeration system provided in another embodiment of this application.
[0031] Explanation of reference numerals in the attached figures:
[0032] 100. Refrigeration system; 10. First refrigeration module; 11. First compressor; 12. First condenser; 13. Load evaporator; 14. Refrigerant storage device; 141. Inlet end; 142. Outlet end; 15. Main circuit; 16. Branch circuit; 17. First throttling device; 18. Second throttling device; 19. First on / off valve; 110. Second on / off valve; 120. Third on / off valve; 130. Third throttling device; 140. First temperature sensor; 150. First pressure sensor; 160. Second temperature sensor; 170. Second pressure sensor; 20. Second refrigeration module; 21. Second compressor; 22. Second condenser; 23. Fourth throttling device. Detailed Implementation
[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0039] See Figure 1 One embodiment of this application provides a refrigeration system 100, which includes a first refrigeration module 10. The first refrigeration module 10 includes a first compressor 11, a first condenser 12, a throttling mechanism, and a load evaporator 13. The first compressor 11, the first condenser 12, at least a portion of the throttling mechanism, and the load evaporator 13 are sequentially connected to form a first closed loop. When the first closed loop is working, the refrigerant circulates in the first compressor 11, the first condenser 12, at least a portion of the throttling mechanism, and the load evaporator 13. When the refrigerant flows through the load evaporator 13, it can exchange heat with electronic components, thereby controlling the temperature of the electronic components.
[0040] The first refrigeration module 10 also includes a refrigerant storage device 14, which has an inlet end 141 and an outlet end 142. Both the inlet end 141 and the outlet end 142 can be controllably connected to or disconnected from the first closed loop. When both the inlet end 141 and the outlet end 142 are connected to the first closed loop, the first compressor 11, the first condenser 12, at least a portion of the throttling mechanism, the load evaporator 13, and the refrigerant storage device 14 are connected to form a second closed loop, thereby increasing the refrigerant circulation volume of the first refrigeration module 10. When the second closed loop is working, the refrigerant circulates in the first compressor 11, the first condenser 12, the throttling mechanism, the refrigerant storage device 14, and the load evaporator 13. When the refrigerant flows through the load evaporator 13, it can exchange heat with the electronic components, thereby controlling the temperature of the electronic components.
[0041] It should be noted that when both the inlet end 141 and the outlet end 142 are connected to the first closed loop, the first compressor 11, the first condenser 12, at least part of the throttling mechanism, the load evaporator 13 and the refrigerant storage 14 are connected to form a second closed loop. The meaning of increasing the refrigerant circulation volume of the first refrigeration module 10 is that when the first refrigeration module 10 forms the second closed loop, the refrigerant circulation volume is larger than when the first refrigeration module 10 only forms the first closed loop. In other words, when the first refrigeration module 10 forms the second closed loop, the amount of refrigerant circulating in the first refrigeration module 10 is greater than the amount of refrigerant when the first refrigeration module 10 only forms the first closed loop.
[0042] Under low-temperature conditions, the load evaporator 13 absorbs less heat, making it less likely for the drain temperature to become too high. Therefore, less refrigerant is needed under low-temperature conditions, and controlling the first closed loop of the refrigeration system 100 is sufficient. Under high-temperature conditions, the load evaporator 13 absorbs more heat, making it more prone to excessively high drain temperatures. Therefore, more refrigerant is needed under high-temperature conditions. Controlling the second closed loop of the refrigeration system 100, or controlling both the second and first closed loops simultaneously, ensures sufficient refrigerant in the refrigeration system 100 to prevent excessively high drain temperatures from the load evaporator 13, thereby reducing damage to the first compressor 11.
[0043] The refrigeration system 100 provided in this application embodiment can control the operation of the first closed loop and the second closed loop according to the requirements of high and low temperature conditions, avoiding the problem of excessively high discharge temperature of the load evaporator 13 under high temperature conditions, thereby reducing the damage to the first compressor 11. Furthermore, compared to the prior art method of cooling the compressor return gas by leading out a bypass branch 16, this ensures that the refrigeration system 100 can provide sufficient refrigerant for heat exchange between the load evaporator 13 and electronic components under high temperature conditions, thereby reducing temperature fluctuations in the load evaporator 13 and improving the temperature control effect on the electronic components.
[0044] The refrigeration system 100 also includes a cooling module, which is thermally coupled to the first condenser 12 for heat dissipation of the first condenser 12, thereby preventing the temperature of the first condenser 12 from becoming too high and ensuring the stable operation of the refrigeration system 100.
[0045] Optionally, continue reading Figure 1 The refrigeration system 100 includes a second refrigeration module 20, which serves as a cooling module. The second refrigeration module 20 includes a second compressor 21, a second condenser 22, and a fourth throttling element 23. The second compressor 21, the second condenser 22, the fourth throttling element 23, and the first condenser 12 are sequentially connected to form a third closed loop. The third closed loop is thermally coupled to both the first and second closed loops through the first condenser 12, which is an evaporator-condenser.
[0046] When the third closed loop is working, the refrigerant circulates through the second compressor 21, the second condenser 22, the fourth throttling element 23, and the first condenser 12. When the refrigerant flows through the first condenser 12, it can exchange heat with the first and second closed loops, thereby cooling both loops. Therefore, the second refrigeration module 20 is a high-temperature refrigeration module, and the first refrigeration module 10 is a low-temperature refrigeration module. In this case, the refrigeration system 100 is a two-stage cascade refrigeration system.
[0047] It is conceivable that in other implementations, the refrigeration system 100 may also include a third refrigeration module, which exchanges heat with the second refrigeration module 20. In this case, the refrigeration system 100 is a more advanced refrigeration system 100.
[0048] In some embodiments, the refrigerant circulation volume of the second closed loop is greater than that of the first closed loop. Thus, when operating at low temperatures, the first closed loop is controlled to operate while the second closed loop is not; when operating at high temperatures, the first closed loop is controlled to be not, while the second closed loop is controlled to operate, simplifying the control logic of the first refrigeration module 10.
[0049] For details, please refer to [link / reference]. Figure 1The first refrigeration module 10 includes a main circuit 15 and two branch circuits 16, with both ends of the two branch circuits 16 connected to the main circuit 15. A first compressor 11, a first condenser 12, and a load evaporator 13 are located on the main circuit 15. The throttling mechanism includes a first throttling element 17 and a second throttling element 18. The first throttling element 17 is located on one of the branch circuits 16, and the second throttling element 18 and a refrigerant storage device 14 are located on the other branch circuit 16. The first compressor 11, the first condenser 12, the first throttling element 17, and the load evaporator 13 are sequentially connected to form a first closed loop. The first compressor 11, the first condenser 12, the second throttling element 18, the load evaporator 13, and the refrigerant storage device 14 are connected to form a second closed loop. That is, the main circuit 15 and one branch circuit 16 form a first closed loop, and the main circuit 15 and the other branch circuit 16 form a second closed loop.
[0050] In the above configuration, the refrigerant in the first closed loop flows to the load evaporator 13 after being throttled by the first throttling element 17, and the refrigerant in the second closed loop flows to the load evaporator 13 after being throttled by the second throttling element 18, so as to facilitate independent control of the expansion and pressure drop of the first and second closed loops.
[0051] Optionally, both the first throttling element 17 and the second throttling element 18 are electronic expansion valves. The electronic expansion valve can automatically adjust the opening degree according to the refrigerant quantity demand of the load evaporator 13 to ensure that the refrigerant quantity flowing to the load evaporator 13 meets the demand.
[0052] Furthermore, the first compressor 11, the first condenser 12, the refrigerant storage device 14, the second throttling device 18, and the load evaporator 13 are sequentially connected to form a second closed loop. The first refrigeration module 10 also includes a first on-off valve 19, which is used to control the connection and disconnection between the inlet end 141 and the first closed loop. Specifically, the first on-off valve 19 is a solenoid valve. In this way, the first on-off valve 19 can control the connection and disconnection between the inlet end 141 of the refrigerant storage device 14 and the first closed loop. The second throttling device 18 is not only used for the expansion and pressure reduction of the refrigerant in the second closed loop, but also can control the connection and disconnection between the outlet end 142 of the refrigerant storage device 14 and the first closed loop (when the opening of the second throttling device 18 is 0, the outlet end 142 of the refrigerant storage device 14 is disconnected from the first closed loop), so as to facilitate the control of the connection and disconnection of the second closed loop.
[0053] It should be noted that the first throttling element 17 can not only control the expansion and pressure drop of the refrigerant in the first closed loop, but also control the opening and closing of the first closed loop (when the opening of the first throttling element 17 is 0, the first closed loop is disconnected). In this way, the switching between the first closed loop and the second closed loop is achieved through the cooperation of the first throttling element 17, the second throttling element 18 and the first on / off valve 19.
[0054] Furthermore, the controllable flow range of the second throttling element 18 is greater than that of the first throttling element 17, so that the refrigerant circulation volume of the second closed loop is greater than that of the first closed loop. In some specific embodiments, both the first throttling element 17 and the second throttling element 18 are electronic expansion valves, and the model of the electronic expansion valve selected for the second throttling element 18 is greater than that selected for the first throttling element 17, so that the controllable flow range of the second throttling element 18 is greater than that of the first throttling element 17.
[0055] The first refrigeration module 10 also includes a first temperature sensor 140 and a first pressure sensor 150. The first temperature sensor 140 is used to detect the return gas end temperature of the first compressor 11, and the first pressure sensor 150 is used to detect the return gas end pressure of the first compressor 11. By detecting the return gas end temperature and return gas end pressure of the first compressor 11, situations where the return gas end temperature and return gas end pressure of the first compressor 11 are too high or too low can be avoided.
[0056] Furthermore, the first refrigeration module 10 also includes a second temperature sensor 160 and a second pressure sensor 170. The second temperature sensor 160 is used to detect the exhaust end temperature of the first compressor 11, and the second pressure sensor 170 is used to detect the exhaust end pressure of the first compressor 11. By checking the exhaust end temperature and exhaust end pressure of the first compressor 11, situations where the exhaust end temperature and exhaust end pressure of the first compressor 11 are too high or too low can be avoided.
[0057] The working principle of the refrigeration system 100 provided in this embodiment is as follows:
[0058] Regardless of whether it is a high-temperature or low-temperature operating condition, the second compressor 21 starts, and the third closed loop works.
[0059] During low-temperature operation, both the second throttling element 18 and the first on / off valve 19 are closed, the first throttling element 17 is open, the first closed loop is active, and the second closed loop is inactive. This determines the refrigerant quantity required for normal operation of the first refrigeration module 10 and records various operational data (including return pressure, exhaust pressure, opening degree of the first throttling element 17, superheat, etc.) for subsequent switching between high-temperature and low-temperature conditions. During high-temperature operation, the first throttling element 17 remains closed, the first closed loop is inactive, and the second closed loop is active. This determines the refrigerant quantity required to maintain high-temperature thermal resistance operation, and this refrigerant quantity serves as the standard for the refrigerant charge of the second refrigeration module 20.
[0060] Switching from low-temperature operating conditions to high-temperature operating conditions:
[0061] Keep the first throttle member 17 closed, the first on-off valve 19 open, and the second throttle member 18 automatically adjust its opening degree so that the excess refrigerant in the refrigerant storage 14 participates in the cycle.
[0062] When switching from high-temperature operation to low-temperature operation:
[0063] To ensure the normal operation of the system when switching from high-temperature conditions to low-temperature conditions, it is necessary to restore the refrigerant quantity of the first refrigeration module 10 to the refrigerant quantity required for low-temperature conditions. It is necessary to find the data of the intermediate condition (the condition between low-temperature and high-temperature conditions) for reference, and continuously adjust the refrigerant accordingly. During the refrigerant quantity calibration stage, the refrigerant quantity for maintaining low-temperature operation is known. Set the temperature of the load evaporator 13 to T, and control the opening degree of the first throttle member 17 to X%. It can be known that the suction pressure of the first compressor 11 at this time is P.
[0064] When the refrigeration system 100 recognizes that it needs to switch from high-temperature operation to low-temperature operation, it enters the refrigerant adjustment logic. First, according to the operation logic of high-temperature conditions, switch the temperature of the load evaporator 13 to T. After the temperature of the load evaporator 13 drops from high temperature to T, operate stably for N1 minutes. After the operation ends, keep the opening degree of the first throttle member 17 always at X%, keep the first on-off valve 19 open, close the second throttle member 18, wait for the system to operate for N2 minutes, then close the first on-off valve 19. At this time, most of the refrigerant in the first refrigeration module 10 is stored in the refrigerant storage 14, and there is less refrigerant in the first closed loop. With the first on-off valve 19 closed, make the first closed loop operate stably for N3 minutes again, and detect the suction pressure of the first compressor 11. It can be detected that the suction pressure P1 < P. Then, keep the opening degree of the second throttle member 18 at X1%, and open it for a certain duration (such as 3s) at this time, and then immediately close the second throttle member 18. Wait for the system to operate stably for N3 minutes, and then detect the value of the suction pressure. Specifically, the detection logic is as follows:
[0065] When P1 < P - ΔP, continue to open the second throttle member 18 to release refrigerant. Optionally, ΔP can be 5Kpa. Of course, in some other embodiments, the specific value of ΔP is not limited.
[0066] When P - ΔP < P1 < P + ΔP, it means that the refrigerant quantity is appropriate. Close the second throttle member 18, and low-temperature testing can be carried out.
[0067] When P1 > P + ΔP, keep the first on-off valve 19 open for a certain duration (such as 3s), and then close it. Wait for the system to operate stably for N4 minutes, detect the value of the suction pressure, and continue to judge the relationship between P1 and P for refrigerant charging and discharging operations until P - ΔP < P1 < P + ΔP, indicating that the refrigerant quantity is appropriate, and finally form a closed loop.
[0068] In some other embodiments, refer to Figure 2The first refrigeration module 10 includes a main circuit 15 and two branch circuits 16, both ends of which are connected to the main circuit 15. A first compressor 11, a first condenser 12, and a load evaporator 13 are mounted on the main circuit 15. The difference from the previous embodiment is that the throttling mechanism includes a third throttling element 130 mounted on the main circuit 15. One branch circuit 16 has a second on / off valve 110, and the other branch circuit 16 has a refrigerant storage device 14 and a third on / off valve 120. The refrigerant storage device 14 has a third on / off valve 120 at both its inlet end 141 and outlet end 142. The third on / off valve 120 corresponding to the inlet end 141 controls the connection between the inlet end 141 and the main circuit 15, and the third on / off valve 120 corresponding to the outlet end 142 controls the connection between the outlet end 142 and the main circuit 15.
[0069] The first compressor 11, the first condenser 12, the third throttling device 130, and the load evaporator 13 are sequentially connected to form a first closed loop. The first compressor 11, the first condenser 12, the third throttling device 130, the refrigerant storage device 14, and the load evaporator 13 are connected to form a second closed loop. Specifically, the second on / off valve 110 and the third on / off valve 120 are both solenoid valves.
[0070] In this embodiment, the throttling mechanism only includes the third throttling element 130 to achieve the expansion and pressure reduction of the refrigerant in the first closed loop and the second closed loop, simplifying the structural configuration of the throttling mechanism. Furthermore, the on / off state of the two branches 16 can be controlled by the second on / off valve 110 and the third on / off valve 120, so as to control the on / off state of the first closed loop and the second closed loop.
[0071] Optionally, the controllable flow range of the third on / off valve 120 is greater than that of the second on / off valve 110, so that the refrigerant circulation volume of the second closed loop is greater than that of the first closed loop. In some specific embodiments, the orifice of the third on / off valve 120 is larger than that of the second on / off valve 110, so that the controllable flow range of the third on / off valve 120 is greater than that of the second on / off valve 110.
[0072] The working principle of the refrigeration system 100 provided in this embodiment is as follows:
[0073] Regardless of whether it is a high-temperature or low-temperature operating condition, the second compressor 21 starts, and the third closed loop works.
[0074] When operating at low temperatures, the third on / off valve 120 is closed, the second on / off valve 110 is open, the first closed loop is active, and the second closed loop is inactive, thus determining the refrigerant quantity required for the normal operation of the first refrigeration module 10. When operating at high temperatures, the first closed loop is inactive, and the second closed loop is active, thus determining the refrigerant quantity required to maintain high-temperature thermal resistance operation. This refrigerant quantity is used as the standard for the refrigerant charge of the second refrigeration module 20.
[0075] Switching from low-temperature operating conditions to high-temperature operating conditions:
[0076] The second shut-off valve 110 is closed, the third shut-off valve 120 is opened, and the opening degree of the third throttling element 130 is increased, so that the excess refrigerant in the refrigerant storage 14 can participate in the circulation.
[0077] Switching from high-temperature operating conditions to low-temperature operating conditions:
[0078] The second shut-off valve 110 opens, the opening of the third throttling element 130 decreases, and the second shut-off valve 110, the third shut-off valve 120 and the third throttling element 130 work together to adjust the amount of refrigerant so that the amount of refrigerant meets the requirements of low temperature conditions.
[0079] It should be noted that when the first refrigeration module 10 forms a second closed loop, increasing the refrigerant circulation volume of the first refrigeration module 10 can be achieved in the following ways:
[0080] When the amount of refrigerant in the branch 16 where the refrigerant storage 14 is located is greater than the amount of refrigerant in the branch 16 without the refrigerant storage 14 (such as the branch 16 where the first throttling device 17 or the second on / off valve 110 is located), the second closed loop is working, and the branch 16 without the refrigerant storage 14 is not working.
[0081] The amount of refrigerant in the branch 16 where the refrigerant storage 14 is located is greater than the amount of refrigerant in the branch 16 without the refrigerant storage 14, and the first closed loop and the second closed loop work simultaneously.
[0082] The amount of refrigerant in the branch 16 where the refrigerant storage 14 is located is less than or equal to the amount of refrigerant in the branch 16 without the refrigerant storage 14, and the first closed loop and the second closed loop work simultaneously.
[0083] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0084] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A refrigeration system, characterized in that, The first refrigeration module (10) includes a first compressor (11), a first condenser (12), a throttling mechanism, and a load evaporator (13). The first compressor (11), the first condenser (12), at least a portion of the throttling mechanism, and the load evaporator (13) are sequentially connected to form a first closed loop. The first refrigeration module (10) further includes a refrigerant storage device (14) for storing refrigerant. The refrigerant storage device (14) has an inlet end (141) and an outlet end (142). Both the inlet end (141) and the outlet end (142) can be controllably connected to or disconnected from the first closed loop. When both the inlet end (141) and the outlet end (142) are connected to the first closed loop, the first compressor (11), the first condenser (12), at least a portion of the throttling mechanism, the load evaporator (13), and the refrigerant storage (14) are connected to form a second closed loop to increase the refrigerant circulation volume of the first refrigeration module (10).
2. The refrigeration system according to claim 1, characterized in that, The refrigerant circulation volume of the second closed loop is greater than that of the first closed loop.
3. The refrigeration system according to claim 1 or 2, characterized in that, The first refrigeration module (10) includes a main circuit (15) and two branch circuits (16). Both ends of the two branch circuits (16) are connected to the main circuit (15). The first compressor (11), the first condenser (12) and the load evaporator (13) are located on the main circuit (15). The throttling mechanism includes a first throttling element (17) and a second throttling element (18). The first throttling element (17) is disposed on one of the branches (16), and the second throttling element (18) and the refrigerant storage device (14) are disposed on the other branch (16). The first compressor (11), the first condenser (12), the first throttling device (17) and the load evaporator (13) are connected in sequence to form the first closed loop; The first compressor (11), the first condenser (12), the second throttling device (18), the load evaporator (13), and the refrigerant storage device (14) are connected to form the second closed loop.
4. The refrigeration system according to claim 3, characterized in that, The first compressor (11), the first condenser (12), the refrigerant storage (14), the second throttling device (18), and the load evaporator (13) are sequentially connected to form the second closed loop; The first refrigeration module (10) further includes a first on / off valve (19), which is used to control the connection and disconnection between the inlet end (141) and the first closed circuit.
5. The refrigeration system according to claim 3, characterized in that, The controllable flow range of the second throttling device (18) is greater than that of the first throttling device (17).
6. The refrigeration system according to claim 1 or 2, characterized in that, The first refrigeration module (10) includes a main circuit (15) and two branch circuits (16). Both ends of the two branch circuits (16) are connected to the main circuit (15). The first compressor (11), the first condenser (12) and the load evaporator (13) are located on the main circuit (15). The throttling mechanism includes a third throttling element (130) located on the main circuit (15). A second on / off valve (110) is provided on one branch circuit (16), and the refrigerant storage device (14) and the third on / off valve (120) are provided on the other branch circuit (16). The first compressor (11), the first condenser (12), the third throttling element (130) and the load evaporator (13) are sequentially connected to form the first closed loop; The first compressor (11), the first condenser (12), the third throttling device (130), the refrigerant storage (14) and the load evaporator (13) are connected to form the second closed loop.
7. The refrigeration system according to claim 6, characterized in that, The controllable flow range of the third on / off valve (120) is greater than that of the second on / off valve (110).
8. The refrigeration system according to claim 1, characterized in that, The first refrigeration module (10) further includes a first temperature sensor (140) and a first pressure sensor (150). The first temperature sensor (140) is used to detect the temperature at the return end of the first compressor (11), and the first pressure sensor (150) is used to detect the pressure at the return end of the first compressor (11). and / or The first refrigeration module (10) further includes a second temperature sensor (160) and a second pressure sensor (170). The second temperature sensor (160) is used to detect the temperature at the exhaust end of the first compressor (11), and the second pressure sensor (170) is used to detect the pressure at the exhaust end of the first compressor (11).
9. The refrigeration system according to claim 1, characterized in that, The refrigeration system further includes a cooling module, which is thermally coupled to the first condenser (12) for heat dissipation of the first condenser (12).
10. The refrigeration system according to claim 9, characterized in that, The refrigeration system includes a second refrigeration module (20), which serves as the cooling module; The second refrigeration module (20) includes a second compressor (21), a second condenser (22) and a fourth throttling device (23). The second compressor (21), the second condenser (22), the fourth throttling device (23) and the first condenser (12) are connected in sequence to form a third closed loop. The third closed loop is thermally coupled to the first closed loop and the second closed loop through the first condenser (12). The first condenser (12) is an evaporator condenser.
11. A testing and sorting device, characterized in that, Includes the refrigeration system as described in any one of claims 1-10.