Refrigeration system and test sorting machine

Abstract

The utility model relates to a refrigeration system and a test sorting machine, comprising a first refrigeration module comprising a first compressor, a first condenser, a first throttling element and a load evaporator which are communicated in sequence to form a first closed loop; the first closed loop comprises a first pipeline communicated between the output end of the first compressor and the input end of the first condenser; an input port of the gas-liquid separator is communicated with the output end of the first throttling element, and a liquid outlet of the gas-liquid separator is communicated with the input end of the load evaporator; one end of the heat exchange pipeline communicates with a gas outlet of the gas-liquid separator, and the other end of the heat exchange pipeline communicates with the input end of the load evaporator and / or the input end of the first compressor; the heat exchange pipeline is thermally coupled with the first pipeline through the first heat exchanger, and a refrigerant in the heat exchange pipeline exchanges heat with a refrigerant in the first pipeline, is cooled and depressurized by the cooling depressurization device and flows to the load evaporator and / or the first compressor.

Description

Technical Field

[0001] The utility model relates to the technical field of test and sorting equipment, in particular to a refrigeration system and a test sorter. Background Art

[0002] Before being put into use, electronic components need to be tested and sorted by a test sorter. The test sorter includes a refrigeration system and a heating system. The refrigeration system serves as a cold source, and the heating system serves as a heat source. The temperature of the electronic components is controlled by the heat confrontation between the cold source and the heat source.

[0003] When the external load temperature is relatively high, the suction temperature of the compressor in the refrigeration system will rise rapidly due to the load heating, which will cause the discharge temperature to be too high. An excessively high discharge temperature is not conducive to the stable operation of the compressor. To reduce the suction temperature of the compressor, a bypass branch is often provided behind the condenser and directly connected to the suction pipe, and a solenoid valve is used to control the mixing of the refrigerant in the bypass branch and the refrigerant in the suction pipe to achieve the purpose of reducing the suction temperature of the compressor. When the suction temperature decreases, the discharge temperature of the compressor also decreases. However, the above method of reducing the suction temperature of the compressor and then reducing the discharge temperature of the compressor requires diverting part of the refrigerant condensed by the condenser, which will cause a large fluctuation in the main circuit and weaken the refrigeration capacity. At the same time, the switching of the solenoid valve (the solenoid valve switch will cause the bypass branch to switch between suddenly connecting and suddenly disconnecting) will cause a large impact on the stable operation of the main circuit and is not conducive to the stable output of the system. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a refrigeration system and a test sorter that can improve the above problems in view of the above problems.

[0005] A refrigeration system includes:

[0006] A first refrigeration module, including a first compressor, a first condenser, a first throttling element, and a load evaporator that are sequentially connected to form a first closed loop; the first closed loop includes a first pipeline connected between the output end of the first compressor and the input end of the first condenser;

[0007] A gas-liquid separator, an input port of which is connected to the output end of the first throttling element, and an output port of which is connected to the input end of the load evaporator;

[0008] A heat exchange pipeline, one end of which is connected to the gas outlet of the gas-liquid separator, and the other end of which is connected to the input end of the load evaporator and / or the input end of the first compressor; and

[0009] A first heat exchanger and a cooling and pressure-reducing device, the heat exchange pipeline is thermally coupled with the first pipeline through the first heat exchanger, and the refrigerant in the heat exchange pipeline exchanges heat with the refrigerant in the first pipeline and then flows to the load evaporator and / or the first compressor after being cooled and depressurized by the cooling and pressure-reducing device.

[0010] In one embodiment, the cooling and pressure-reducing device includes:

[0011] A second heat exchanger;

[0012] A cooling mechanism, the cooling mechanism is thermally coupled with the heat exchange pipeline through the second heat exchanger to cool the refrigerant in the heat exchange pipeline;

[0013] A second throttling member is provided on the heat exchange pipeline, and the refrigerant in the heat exchange pipeline expands and depressurizes to the second throttling member after being cooled by the cooling mechanism.

[0014] In one embodiment, the refrigeration system further includes a second refrigeration module, and the second refrigeration module forms the cooling mechanism;

[0015] The second refrigeration module includes a second compressor, a second condenser, a third throttling member and the first condenser that are sequentially connected to form a second closed loop. The first closed loop is thermally coupled with the second closed loop through the first condenser, and the first condenser serves as an evaporative condenser; the second closed loop includes a second pipeline connecting the output end of the first throttling member and the input end of the second compressor;

[0016] The heat exchange pipeline is thermally coupled with the second pipeline through the second heat exchanger.

[0017] In one embodiment, the second pipeline is located between the output end of the evaporative condenser and the input end of the second compressor.

[0018] In one embodiment, the heat exchange pipeline includes a main pipeline and two branch pipelines. One end of the main pipeline is communicated with the air outlet of the gas-liquid separator, and one end of each branch pipeline is communicated with the other end of the main pipeline;

[0019] The other end of one branch pipeline is communicated with the input end of the load evaporator, and the other branch pipeline is communicated with the input end of the first compressor.

[0020] In one embodiment, the refrigeration system further includes two control valves, and the two control valves are respectively provided on the two branch pipelines to control the on-off of the branch pipelines.

[0021] In one embodiment, the refrigeration system further includes a second throttling member;

[0022] The second throttling member is provided on the main pipeline; or there are a plurality of second throttling members which are respectively provided on the branch pipelines.

[0023] In one embodiment, the first refrigeration module further includes a fourth throttling member, and the fourth throttling member is located between the liquid outlet of the gas-liquid separator and the input end of the load evaporator.

[0024] In one embodiment, the refrigeration system further includes an oil separator, and the oil separator is provided on the first pipeline;

[0025] and / or

[0026] The refrigeration system further includes a first drying filter, and the first drying filter is provided on the first closed loop and is located between the output end of the first condenser and the input port of the gas-liquid separator.

[0027] A test sorter includes the refrigeration system as described above.

[0028] For the above refrigeration system and test sorter, the refrigerant after throttling and pressure reduction by the first throttling member flows to the gas-liquid separator. The gas-liquid separator separates gas and liquid. The separated liquid phase flows to the load evaporator, and the gas phase flows to the heat exchange pipeline. In this way, the dryness of the refrigerant flowing to the load evaporator is reduced (when the gas phase flowing to the load evaporator decreases, the dryness of the refrigerant decreases. Since the latent heat of the refrigerant is small, if the refrigerant with too high dryness flows to the load evaporator, it is not conducive to the full play of the performance of the refrigeration system), so that more liquid phase flows to the load evaporator. A larger proportion of the liquid phase is conducive to the heat exchange between the load evaporator and the electronic components, ensuring the full play of the performance of the refrigeration system. At the same time, the gas phase separated by the gas-liquid separator flows to the first heat exchanger through the heat exchange pipeline to exchange heat with the refrigerant in the exhaust pipe (the first pipeline) of the first compressor, achieving the purpose of reducing the exhaust temperature of the first compressor. Compared with the prior art method of reducing the return gas temperature of the first compressor and then reducing its exhaust temperature by setting a bypass branch connected to the return gas pipe, the gas phase separated by the gas-liquid separator is less and will not divert a large amount of refrigerant, and will not cause a large fluctuation to the first closed loop, ensuring the refrigeration capacity of the refrigeration system. And the refrigerant in the heat exchange pipeline is always kept flowing to the load evaporator and / or the first compressor after being cooled and depressurized by the cooling and pressure reducing device, and will not cause a large impact on the first closed loop due to the sudden truncation or sudden truncation and connection of the heat exchange pipeline, ensuring the stable output of the refrigeration system. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the refrigeration system provided by an embodiment of the present application;

[0030] Figure 2Schematic diagram of the refrigeration system provided by another embodiment of the present application;

[0031] Figure 3 Schematic diagram of the refrigeration system provided by yet another embodiment of the present application;

[0032] Figure 4 Schematic diagram of the refrigeration system provided by still another embodiment of the present application.

[0033] Explanation of reference numerals:

[0034] 100, refrigeration system; 10, first refrigeration module; 11, first compressor; 12, first condenser; 13, first throttling element; 14, load evaporator; 15, fourth throttling element; 16, first pipeline; 17, oil separator; 18, first drying filter; 20, gas-liquid separator; 21, input port; 22, liquid outlet; 23, gas outlet; 30, heat exchange pipeline; 31, main pipeline; 32, branch pipeline; 40, first heat exchanger; 50, second heat exchanger; 60, second throttling element; 70, second refrigeration module; 71, second compressor; 72, second condenser; 73, third throttling element; 74, second pipeline; 75, second drying filter; 80, control valve; 90, cooling and pressure reducing device. Detailed implementation manners

[0035] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0037] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0040] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0041] Refer to Figure 1 and Figure 2, an embodiment of the present application provides a refrigeration system 100, including a first refrigeration module 10. The first refrigeration module 10 includes a first compressor 11, a first condenser 12, a first throttling element 13, and a load evaporator 14. The first compressor 11, the first condenser 12, the first throttling element 13, and the load evaporator 14 are connected in sequence to form a first closed loop. Optionally, the first throttling element 13 is a throttle valve. When the first closed loop is operating, the refrigerant circulates in the first compressor 11, the first condenser 12, the first throttling element 13, and the load evaporator 14. When the refrigerant passes through the load evaporator 14, it can exchange heat with the electronic components, thereby controlling the temperature of the electronic components.

[0042] The refrigeration system 100 further includes a gas-liquid separator 20, which has an inlet 21, a liquid outlet 22, and a gas outlet 23. The inlet 21 of the gas-liquid separator 20 is connected to the output end of the first throttling element 13, and the liquid outlet 22 of the gas-liquid separator 20 is connected to the input end of the load evaporator 14. The refrigerant flows to the gas-liquid separator 20 after being throttled by the first throttling element 13. After gas-liquid separation by the gas-liquid separator 20, the liquid phase flows to the load evaporator 14 to cool the electronic components.

[0043] The refrigeration system 100 further includes a heat exchange pipeline 30, a first heat exchanger 40, and a cooling and pressure-reducing device 90. One end of the heat exchange pipeline 30 is connected to the gas outlet 23 of the gas-liquid separator 20, and the other end is connected to the input end of the load evaporator 14 and / or the input end of the first compressor 11. The heat exchange pipeline 30 is thermally coupled to the first pipeline 16 through the first heat exchanger 40. Optionally, the first heat exchanger 40 has two flow channels, one flow channel is connected to the heat exchange pipeline 30, and the other flow channel is connected to the first pipeline 16. When the refrigerants in the heat exchange pipeline 30 and the first pipeline 16 flow through the two flow channels of the first heat exchanger 40 respectively, heat exchange occurs. After the refrigerant in the heat exchange pipeline 30 exchanges heat with the refrigerant in the first pipeline 16, it flows to the load evaporator 14 and / or the first compressor 11 after being cooled and pressure-reduced by the cooling and pressure-reducing device 90. In this way, the gas phase formed by the separation of the gas-liquid separator 20 flows to the heat exchange pipeline 30 and exchanges heat with the refrigerant in the first pipeline 16 when flowing through the first heat exchanger 40. At this time, the temperature of the refrigerant in the first pipeline 16 decreases, achieving the purpose of reducing the exhaust temperature of the first compressor 11. At the same time, the temperature of the gas-phase refrigerant in the heat exchange pipeline 30 increases. The refrigerant with the increased temperature flows to the load evaporator 14 together with the refrigerant in the first closed loop after being cooled and pressure-reduced by the cooling and pressure-reducing device 90 for temperature control of the electronic components, and / or the refrigerant with the increased temperature flows to the first compressor 11 after being cooled and pressure-reduced by the cooling and pressure-reducing device 90 to reduce the suction temperature of the first compressor 11.

[0044] It should be noted here that the connection of the heat exchange pipeline 30 to the input end of the load evaporator 14 and / or the input end of the first compressor 11 includes the following three methods:

[0045] 1. The heat exchange pipeline 30 is connected to the input end of the load evaporator 14. The refrigerant in the heat exchange pipeline 30 and the refrigerant in the first closed loop flow together to the load evaporator 14, and then flow through the load evaporator 14 to the first compressor 11.

[0046] 2. The heat exchange pipeline 30 is connected to the input end of the first compressor 11. The refrigerant in the heat exchange pipeline 30 flows to the first compressor 11 to reduce the suction temperature of the first compressor 11.

[0047] 3. The heat exchange pipeline 30 is connected to the input end of the load evaporator 14, and at the same time, the heat exchange pipeline 30 is connected to the input end of the first compressor 11. The refrigerant in the heat exchange pipeline 30 and the refrigerant in the first closed loop flow together to the load evaporator 14, and the refrigerant in the heat exchange pipeline 30 flows to the first compressor 11 to reduce the suction temperature of the first compressor 11.

[0048] In the refrigeration system 100 provided by the embodiment of the present application, the refrigerant throttled and depressurized by the first throttling member 13 flows to the gas-liquid separator 20. The gas-liquid separator 20 separates the gas and liquid. The separated liquid phase flows to the load evaporator 14, and the gas phase flows to the heat exchange pipeline 30. In this way, the dryness of the refrigerant flowing to the load evaporator 14 is reduced (since the gas phase flows to the heat exchange pipeline 30, the gas phase flowing to the load evaporator 14 is reduced, so the dryness of the refrigerant is reduced. Since the latent heat of the refrigerant is small, if the refrigerant with too high dryness flows to the load evaporator 14, it is not conducive to the full play of the performance of the refrigeration system 100), so that more liquid phase flows to the load evaporator 14. A larger proportion of the liquid phase is conducive to the heat exchange between the load evaporator 14 and the electronic components, ensuring the full play of the performance of the refrigeration system 100. At the same time, the gas phase separated by the gas-liquid separator 20 flows through the heat exchange pipeline 30 to the first heat exchanger 40 to exchange heat with the refrigerant in the exhaust pipe (the first pipeline 16) of the first compressor 11, achieving the purpose of reducing the exhaust temperature of the first compressor 11. Compared with the prior art method of reducing the suction temperature of the first compressor 11 and then reducing its exhaust temperature by setting a bypass branch connected to the suction pipe, the gas phase separated by the gas-liquid separator 20 is less and will not divert a large amount of refrigerant, and will not cause a large fluctuation to the first closed loop, ensuring the refrigeration capacity of the refrigeration system 100. And, the refrigerant in the heat exchange pipeline 30 is always cooled and depressurized by the cooling and pressure reducing device 90 and flows to the load evaporator 14 and / or the first compressor 11, and will not cause a large impact on the first closed loop due to the sudden connection or sudden cut-off connection of the heat exchange pipeline 30, ensuring the stable output of the refrigeration system 100.

[0049] Continue to refer to Figure 1 and Figure 2, the first refrigeration module 10 further includes a fourth throttling member 15, and the fourth throttling member 15 is disposed between the liquid outlet 22 of the gas-liquid separator 20 and the input end of the load evaporator 14. In this way, the liquid phase separated by the gas-liquid separator 20 enters the fourth throttling member 15 for throttling again, further reducing the temperature of the refrigerant flowing to the load evaporator 14 while ensuring an appropriate dryness, and ensuring the full performance of the refrigeration system 100. Optionally, the fourth throttling member 15 is an electronic expansion valve.

[0050] It should be noted here that although the above describes what specific settings the first throttling member 13 and the fourth throttling member 15 adopt, the above description does not limit the types of the first throttling member 13 and the fourth throttling member 15. For example, the first throttling member 13 and the fourth throttling member 15 can also adopt capillary tubes, etc. Similarly, the same applies to the settings of other throttling members described below, without limitation.

[0051] In some embodiments, referring to Figure 3 and Figure 4 , the cooling and pressure-reducing device 90 includes a second heat exchanger 50, a cooling mechanism, and a second throttling member 60. The cooling mechanism is thermally coupled to the heat exchange pipeline 30 through the second heat exchanger 50 to cool the refrigerant in the heat exchange pipeline 30. The second throttling member 60 is disposed on the heat exchange pipeline 30, and the refrigerant in the heat exchange pipeline 30 is cooled by the cooling mechanism and then expands and reduces pressure through the second throttling member 60. Optionally, the second throttling member 60 is an electronic expansion valve. In this way, when the refrigerant in the heat exchange pipeline 30 flows through the second heat exchanger 50, it can exchange heat with the cooling mechanism and the temperature decreases, and then when it passes through the second throttling member 60, it can expand and reduce pressure, so that the high-temperature and high-pressure refrigerant in the heat exchange pipeline 30 becomes low-temperature and low-pressure refrigerant and flows to the load evaporator 14 and / or the first compressor 11.

[0052] Further, continue to refer to Figure 3 and Figure 4, the refrigeration system 100 further includes a second refrigeration module 70, and the second refrigeration module 70 forms a cooling mechanism. The second refrigeration module 70 includes a second compressor 71, a second condenser 72, a third throttling member 73, and a first condenser 12. The second compressor 71, the second condenser 72, the third throttling member 73, and the first condenser 12 are connected in sequence to form a second closed loop. Optionally, the third throttling member 73 is a thermostatic expansion valve. The first closed loop is thermally coupled to the second closed loop through the first condenser 12, and the first condenser 12 serves as an evaporative condenser. Among them, the first refrigeration module 10 is a low-temperature refrigeration module, and the second refrigeration module 70 is a high-temperature refrigeration module. The second closed loop includes a second pipeline 74, and both ends of the second pipeline 74 are respectively connected to the output end of the first throttling member 13 and the input end of the second compressor 71. The heat exchange pipeline 30 is thermally coupled to the second pipeline 74 through the second heat exchanger 50. Optionally, the second heat exchanger 50 has two flow channels, one flow channel is connected to the heat exchange pipeline 30, and the other flow channel is connected to the second pipeline 74. When the refrigerants in the heat exchange pipeline 30 and the second pipeline 74 flow through the two flow channels of the second heat exchanger 50 respectively, heat exchange occurs.

[0053] When the second closed loop is working, the refrigerant circulates in the second compressor 71, the second condenser 72, the third throttling member 73, and the first condenser 12 (evaporative condenser). When the refrigerant flows through the first condenser 12, it exchanges heat with the refrigerant in the first closed loop to reduce the temperature of the refrigerant in the first closed loop. Since the second pipeline 74 is located between the output end of the first throttling member 13 and the input end of the second compressor 71, the temperature of the refrigerant in the second pipeline 74 is relatively low. The high-temperature refrigerant in the heat exchange pipeline 30 can exchange heat with the low-temperature refrigerant in the second pipeline 74 in the second heat exchanger 50. In this way, the purpose of cooling the refrigerant in the heat exchange pipeline 30 is achieved through the second refrigeration module 70.

[0054] It can be imagined that in some other embodiments, there is no limitation on the setting of the cooling mechanism, as long as the setting method can play the role of cooling the refrigerant in the heat exchange pipeline 30.

[0055] Specifically, the second condenser 72 is a water-cooled condenser, and the water-cooled condenser cools down the refrigerant flowing through itself and located on the second closed loop through cooling water. In some other embodiments, the second condenser 72 can also be an air-cooled condenser, and the heat dissipation of the second condenser 72 is achieved through a peripheral fan, so as to cool down the refrigerant in the second closed loop.

[0056] In some embodiments, continue to refer to Figure 3 and Figure 4, the second pipeline 74 is located between the output end of the evaporation condenser and the input end of the second compressor 71. In this way, the refrigerant in the second closed loop first cools the refrigerant in the first closed loop through the evaporation condenser and then flows to the second pipeline 74, and then exchanges heat with the refrigerant in the heat exchange pipeline 30 in the second pipeline 74, ensuring sufficient cooling capacity required for heat exchange with the first closed loop. That is, when the second refrigeration module 70 serves as both a high-temperature stage refrigeration module and a cooling mechanism, on the premise that the second refrigeration module 70 can ensure the cooling capacity required by the first refrigeration module 10, it can also achieve the purpose of cooling the refrigerant in the heat exchange pipeline 30.

[0057] Of course, in some other embodiments, the two ends of the second pipeline 74 can also be respectively communicated with the output end of the third throttling member 73 and the input end of the evaporation condenser. At this time, the purpose of cooling the refrigerant in the heat exchange pipeline 30 can also be achieved.

[0058] In some embodiments, the heat exchange pipeline 30 includes a main pipeline 31 and two branch pipelines 32. One end of the main pipeline 31 is communicated with the air outlet 23 of the gas-liquid separator 20, and one end of each branch pipeline 32 is communicated with the other end of the main pipeline 31. Specifically, the main pipeline 31 is thermally coupled with the first pipeline 16 through the first heat exchanger 40 and is thermally coupled with the second pipeline 74 through the second heat exchanger 50. The other end of one branch pipeline 32 is communicated with the input end of the load evaporator 14, and the other end of the other branch pipeline 32 is communicated with the input end of the first compressor 11. With this setting, the refrigerant in the heat exchange pipeline 30 can flow to the load evaporator 14 through one branch pipeline 32 and to the first compressor 11 through the other branch pipeline 32 without interference.

[0059] In some specific embodiments, the cooling and pressure-reducing device 90 includes a second throttling member 60, and the second throttling member 60 is arranged on the main pipeline 31. The refrigerant in the main pipeline 31 flows to the two branch pipelines 32 after being throttled by the second throttling member 60. In some other specific embodiments, the cooling and pressure-reducing device 90 includes a plurality of second throttling members 60, which are respectively arranged on the two branch pipelines 32, and the refrigerant in each branch pipeline 32 expands and reduces pressure through the second throttling member 60 arranged thereon.

[0060] The refrigeration system 100 further includes two control valves 80, and the two control valves 80 are respectively arranged on the two branch pipelines 32 to control the on-off of the branch pipelines 32. In this way, according to whether the first compressor 11 needs to return gas for cooling, the on-off of the two branch pipelines 32 is controlled by the control valve 80 to ensure the stable operation of the refrigeration system 100.

[0061] The first refrigeration module 10 further includes an oil separator 17, which is disposed on the first pipeline 16. The oil separator 17 can separate the lubricating oil in the high-temperature steam discharged by the first compressor 11 to ensure the safe and efficient operation of the system.

[0062] Further, the first refrigeration module 10 further includes a first dryer filter 18, which is disposed on the first closed loop and is located between the output end of the first condenser 12 and the input port 21 of the gas-liquid separator 20. The first dryer filter 18 functions to filter the impurities of the refrigerant in the first closed loop. Furthermore, the second refrigeration module 70 further includes a second dryer filter 75, which is disposed on the second closed loop and is located between the output end of the second condenser 72 and the input end of the third throttling member 73. The second dryer filter 75 functions to filter the impurities of the refrigerant in the second closed loop.

[0063] Continue to refer to Figure 3 , and a more detailed description of the refrigeration system 100 provided by the present application will be given below in a specific embodiment.

[0064] The refrigeration system 100 includes a first refrigeration module 10 and a second refrigeration module 70. The first refrigeration module 10 includes a first compressor 11, a first condenser 12, a first throttling member 13, and a load evaporator 14. The second refrigeration module 70 includes a second compressor 71, a second condenser 72, a third throttling member 73, and the first condenser 12. The first compressor 11, the first condenser 12, the first throttling member 13, and the load evaporator 14 are sequentially connected in series to form a first closed loop, and the second compressor 71, the second condenser 72, the third throttling member 73, and the first condenser 12 are sequentially connected in series to form a second closed loop. The first closed loop and the second closed loop are thermally coupled through the first condenser 12, and the first condenser 12 serves as an evaporative condenser. The first refrigeration module 10 is a low-temperature refrigeration module, and the second refrigeration module 70 is a high-temperature refrigeration module. Among them, the first closed loop includes a first pipeline 16, and the first pipeline 16 is located between the output end of the first compressor 11 and the input end of the evaporative condenser. The second closed loop includes a second pipeline 74, and the second pipeline 74 is located between the output end of the evaporative condenser and the input end of the second compressor 71.

[0065] The refrigeration system 100 further includes a gas-liquid separator 20, a heat exchange pipeline 30, a first heat exchanger 40, and a second heat exchanger 50. The first refrigeration module 10 further includes a fourth throttling member 15, which is located between the first throttling member 13 and the load evaporator 14, and the gas-liquid separator 20 is located between the first throttling member 13 and the fourth throttling member 15. The heat exchange pipeline 30 includes a main pipeline 31 and two branch pipelines 32. The input port 21 of the gas-liquid separator 20 is communicated with the first throttling member 13, the liquid outlet 22 is communicated with the fourth throttling member 15, and the gas outlet 23 is communicated with one end of the main pipeline 31. The main pipeline 31 is thermally coupled with the first pipeline 16 through the first heat exchanger 40 and thermally coupled with the second pipeline 74 through the second heat exchanger 50. One end of each branch pipeline 32 is communicated with the other end of the main pipeline 31. The other end of one branch pipeline 32 is communicated with the load evaporator 14, and the other end of the other branch pipeline 32 is communicated with the first compressor 11. A second throttling member 60 is provided on the main pipeline 31, and a control valve 80 is provided on each branch pipeline 32.

[0066] The working principle of the above refrigeration system 100 is as follows:

[0067] When the suction gas temperature T1 of the first compressor 11 ≤ T (T is the suction gas temperature control value of the first compressor 11), the refrigerant in the low-temperature main circuit circulates in the first compressor 11, the first heat exchanger 40, the evaporative condenser, the first throttling member 13, the gas-liquid separator 20, the fourth throttling member 15, and the load evaporator 14. The refrigerant in the high-temperature stage circulates in the second compressor 71, the second condenser 72, the third throttling member 73, the evaporative condenser, and the second heat exchanger 50. The control valve 80 on the branch pipeline 32 corresponding to the first compressor 11 is closed, and the other control valve 80 is opened. The gaseous refrigerant in the branch separated by the gas-liquid separator 20 is heated through heat exchange in the first heat exchanger 40, condensed into refrigerant liquid through heat exchange in the second heat exchanger 50, and then throttled by the second throttling member 60 and mixed with the refrigerant in the low-temperature main circuit and enters the load evaporator 14.

[0068] When the suction temperature T1 of the first compressor 11 > T. The refrigerant in the main circuit of the low-temperature stage circulates in the first compressor 11, the first heat exchanger 40, the evaporative condenser, the first throttling member 13, the gas-liquid separator 20, the fourth throttling member 15, and the load evaporator 14. The refrigerant in the high-temperature stage circulates in the second compressor 71, the second condenser 72, the third throttling member 73, the evaporative condenser, and the second heat exchanger 50. The control valve 80 on the branch pipeline 32 corresponding to the first compressor 11 is opened. The branched gaseous refrigerant separated by the gas-liquid separator 20 has its temperature increased after heat exchange in the first heat exchanger 40, is condensed into refrigerant liquid after heat exchange in the second heat exchanger 50, and then throttled by the second throttling member 60 and mixed with the refrigerant at the suction end of the first compressor 11 and enters the first compressor 11 to reduce the suction temperature of the first compressor 11. The control valve 80 on the other branch pipeline 32 can be opened or closed, which is not limited herein.

[0069] Another embodiment of the present application further provides a test and sorting machine, including the refrigeration system 100 described above. Since the refrigeration system 100 has beneficial effects, correspondingly, the test and sorting machine including the above refrigeration system 100 has the same beneficial effects, which will not be elaborated in detail herein.

[0070] Specifically, the test and sorting machine further includes a heating system. The refrigeration system and the heating system carry out heat and cold confrontation to control the temperature of electronic components.

[0071] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0072] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A refrigeration system, characterized in that, Comprising: A first refrigeration module (10), including a first compressor (11), a first condenser (12), a first throttling element (13), and a load evaporator (14) that are sequentially connected to form a first closed loop; the first closed loop includes a first pipeline (16) connected between the output end of the first compressor (11) and the input end of the first condenser (12); A gas-liquid separator (20), an input port (21) is connected to the output end of the first throttling element (13), and a liquid outlet (22) is connected to the input end of the load evaporator (14); A heat exchange pipeline (30), one end is connected to the gas outlet (23) of the gas-liquid separator (20), and the other end is connected to the input end of the load evaporator (14) and / or the input end of the first compressor (11); and A first heat exchanger (40) and a cooling and pressure-reducing device (90), the heat exchange pipeline (30) and the first pipeline (16) are thermally coupled through the first heat exchanger (40), and the refrigerant in the heat exchange pipeline (30) exchanges heat with the refrigerant in the first pipeline (16) and then flows to the load evaporator (14) and / or the first compressor (11) after being cooled and depressurized by the cooling and pressure-reducing device (90).

2. The refrigeration system according to claim 1, characterized in that, The cooling and pressure-reducing device (90) includes: A second heat exchanger (50); A cooling mechanism, the cooling mechanism is thermally coupled to the heat exchange pipeline (30) through the second heat exchanger (50) to cool the refrigerant in the heat exchange pipeline (30); A second throttling element (60), arranged on the heat exchange pipeline (30), and the refrigerant in the heat exchange pipeline (30) expands and depressurizes to the second throttling element (60) after being cooled by the cooling mechanism.

3. The refrigeration system according to claim 2, characterized in that, The refrigeration system further includes a second refrigeration module (70), and the second refrigeration module (70) forms the cooling mechanism; The second refrigeration module (70) includes a second compressor (71), a second condenser (72), a third throttling element (73), and the first condenser (12) that are sequentially connected to form a second closed loop, the first closed loop is thermally coupled to the second closed loop through the first condenser (12), and the first condenser (12) serves as an evaporative condenser; the second closed loop includes a second pipeline (74) connected between the output end of the first throttling element (13) and the input end of the second compressor (71); The heat exchange pipeline (30) is thermally coupled to the second pipeline (74) through the second heat exchanger (50).

4. The refrigeration system according to claim 3, wherein, The second pipeline (74) is located between the output end of the evaporative condenser and the input end of the second compressor (71).

5. The refrigeration system according to claim 1, characterized in that, The heat exchange pipeline (30) includes a main pipeline (31) and two branch pipelines (32), one end of the main pipeline (31) is connected to the gas outlet (23) of the gas-liquid separator (20), and one end of each branch pipeline (32) is connected to the other end of the main pipeline (31); The other end of one of the branch pipelines (32) is communicated with the input end of the load evaporator (14), and the other branch pipeline (32) is communicated with the input end of the first compressor (11).

6. The refrigeration system according to claim 5, wherein The refrigeration system further includes two control valves (80), and the two control valves (80) are respectively arranged on the two branch pipelines (32) for controlling the on-off of the branch pipelines (32).

7. The refrigeration system according to any one of claims 5-6, characterized in that, The refrigeration system further includes a second throttling member (60); The second throttling member (60) is arranged on the main pipeline (31); or there are multiple second throttling members (60) which are respectively arranged on the branch pipelines (32).

8. The refrigeration system according to claim 1, wherein The first refrigeration module (10) further includes a fourth throttling member (15), and the fourth throttling member (15) is located between the liquid outlet (22) of the gas-liquid separator (20) and the input end of the load evaporator (14).

9. The refrigeration system according to claim 1, characterized in that, The refrigeration system further includes an oil separator (17), and the oil separator (17) is arranged on the first pipeline (16); and / or The refrigeration system further includes a first drying filter (18), and the first drying filter (18) is arranged on the first closed loop and is located between the output end of the first condenser (12) and the input port (21) of the gas-liquid separator (20).

10. A test sorter, characterized in that, A refrigeration system includes the refrigeration system according to any one of claims 1-9.

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