Refrigeration system and test sorting equipment

Abstract

The utility model relates to a refrigeration system and test sorting equipment, comprising: a first refrigeration module comprising a first compressor, a first condenser, at least one throttling assembly and at least one load evaporator, the throttling assembly and the load evaporator being arranged in one-to-one correspondence; the first compressor, the first condenser, one throttling assembly and one load evaporator are sequentially communicated to form a first closed loop; the throttling assembly comprises at least two thermal expansion valves which are connected in parallel and / or in series. A temperature sensing bag of each thermal expansion valve is used for detecting the temperature of the outlet end of the corresponding load evaporator. The controllable superheat degree ranges of the at least two thermostatic expansion valves included in the throttling assembly are different. Compared with the condition that one thermal expansion valve is adopted in the prior art, at least two thermal expansion valves are matched with each other to expand the adjusting range of the superheat degree of the outlet of the load evaporator, and the requirement for adjusting the superheat degree in a large range can be met.

Description

Technical Field

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

[0002] Electronic component testing and sorting equipment is equipped with a temperature control system consisting of a cooling system and a heating system. During component testing, the refrigerant provided by the cooling system exchanges heat with the electronic components through the load evaporator. The cooling and heating systems counteract each other to maintain the target temperature.

[0003] Before entering the load evaporator, the refrigerant first passes through a thermal expansion valve. This valve regulates the refrigerant flow to the load evaporator, thereby adjusting the outlet superheat of the load evaporator. However, due to the structure of traditional refrigeration systems, the thermal expansion valve can only adjust the outlet superheat of the load evaporator within a certain range. The load evaporator has a wide operating temperature range, and a thermal expansion valve with a narrow adjustment range cannot meet the requirements of a wide range of superheat regulation. For example, when the load evaporator operates at a high temperature, the superheat is too large, and the thermal expansion valve is always open to the maximum, losing its refrigerant flow regulation function. Utility Model Content

[0004] Based on this, it is necessary to provide a refrigeration system and testing and sorting equipment that can improve the above problems.

[0005] A refrigeration system comprising:

[0006] The first refrigeration module includes a first compressor, a first condenser, at least one throttling assembly, and at least one load evaporator, wherein the throttling assembly is arranged in a one-to-one correspondence with the load evaporator; the first compressor, the first condenser, one of the throttling assemblies, and one of the load evaporators are sequentially connected to form a first closed loop;

[0007] The throttling assembly includes at least two thermal expansion valves connected in parallel and / or in series, and the temperature sensing package of each thermal expansion valve is used to detect the temperature of the outlet end of the corresponding load evaporator;

[0008] The controllable superheat ranges of at least two thermal expansion valves included in the throttling assembly are different.

[0009] In one embodiment, the throttling assembly includes at least a first thermal expansion valve and a second thermal expansion valve, and the controllable superheat range of the first thermal expansion valve is larger than that of the second thermal expansion valve; the first thermal expansion valve is used to adaptively adjust the outlet superheat of the corresponding load evaporator under high temperature conditions, and the second thermal expansion valve is used to adaptively adjust the outlet superheat of the corresponding load evaporator under low temperature conditions.

[0010] In one embodiment, the first compressor is connected to the first condenser to form a main refrigeration circuit;

[0011] One of the throttling components and one of the load evaporators are connected to form a refrigeration branch, and the first refrigeration module includes a plurality of the refrigeration branches;

[0012] Each of the refrigeration branches is connected to the refrigeration main circuit to form a first closed loop, and the temperature sensing package of the thermal expansion valve of each of the refrigeration main circuits is used to detect the temperature of the output end of the refrigeration branch.

[0013] In one embodiment, each of the throttling assemblies includes at least two of the thermal expansion valves connected in parallel.

[0014] In one embodiment, the throttling assembly further includes a first resistance increasing member, which is provided on a first parallel pipeline where the thermal expansion valve having a smaller controllable superheat range is located, so as to increase the flow resistance of the first parallel pipeline where the thermal expansion valve is located; and / or

[0015] The throttling component also includes a first control valve, which is arranged on the first parallel pipeline where the thermal expansion valve with a smaller controllable superheat range is located to control the on-off of the first parallel pipeline where the thermal expansion valve is located.

[0016] In one embodiment, each of the throttling assemblies includes at least two thermal expansion valves connected in series.

[0017] In one embodiment, the throttling assembly further includes a second resistance increasing member, which is connected in parallel with the thermal expansion valve having a larger controllable superheat range; and / or

[0018] The throttling assembly further includes a second control valve, which is connected in parallel with the thermal expansion valve having a larger controllable superheat range.

[0019] In one embodiment, the second resistance increasing member and / or the second control valve are arranged on a second parallel pipeline and are connected in parallel with the thermal expansion valve having a larger controllable superheat range through the second parallel pipeline.

[0020] In one embodiment, the first resistance-increasing member or the second resistance-increasing member is a capillary tube.

[0021] In one embodiment, the first refrigeration module further comprises an electronic expansion valve, which is provided on the first closed loop and located between the output end of the first condenser and the input end of each of the throttling components; and / or

[0022] The refrigeration system further includes a second refrigeration module, which includes a second compressor, a second condenser, a throttle valve and the first condenser which are sequentially connected to form a second closed loop, and the first condenser is an evaporative condenser.

[0023] A testing and sorting device includes the refrigeration system as described above.

[0024] In the above-mentioned refrigeration system and testing and sorting equipment, the temperature-sensing bulb of each thermal expansion valve of the throttling assembly can detect the temperature of the outlet of the corresponding load evaporator. That is, when the temperature of the refrigerant at the outlet of the load evaporator changes, the phase of the medium in the temperature-sensing bulb changes accordingly, thereby causing the opening of the thermal expansion valve to change accordingly. In this way, the opening of the thermal expansion valve can be adaptively adjusted as the outlet superheat of the load evaporator varies, thereby achieving the purpose of adjusting the outlet superheat of the load evaporator. In addition, since the throttling assembly includes at least two thermal expansion valves, the two thermal expansion valves have different controllable superheat ranges. Compared with the prior art that uses one thermal expansion valve, the at least two thermal expansion valves cooperate with each other to expand the adjustment range of the outlet superheat of the load evaporator, which can meet the needs of adjusting the superheat over a wide range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a refrigeration system according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of a refrigeration system provided in accordance with another embodiment of the present application;

[0027] Figure 3 A schematic diagram of a refrigeration system provided in yet another embodiment of the present application;

[0028] Figure 4 A schematic diagram of a refrigeration system provided in yet another embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100. Refrigeration system; 10. First refrigeration module; 11. First compressor; 12. First condenser; 13. Throttling assembly; 131. First thermal expansion valve; 132. Second thermal expansion valve; 133. Temperature sensing package; 14. Load evaporator; 15. Electronic expansion valve; 16. Refrigeration main circuit; 17. Refrigeration branch circuit; 18. First resistance-increasing component; 19. First control valve; 101. Second resistance-increasing component; 102. Second control valve; 20. Second refrigeration module; 21. Second compressor; 22. Second condenser; 23. Throttling valve. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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, and do not indicate or imply 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 a limitation to the present invention.

[0033] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 implementation methods.

[0037] As described in the background, the traditional refrigeration system's thermal expansion valve (TEV) can only adjust the evaporator's superheat within a certain range. However, the evaporator's operating temperature range is very wide, and a TEV with a narrow adjustment range cannot meet the requirements for wide-ranging superheat control. For example, if the evaporator operates at high temperatures, the superheat will be too high, and the TEV will remain at its maximum opening, losing its ability to regulate refrigerant flow.

[0038] The applicant's research has discovered that the root cause of the aforementioned problem lies in the following: In the prior art, a thermal expansion valve is installed before the load evaporator, controlling the outlet superheat of the load evaporator via a temperature sensor and a pressure sensor. When the thermal expansion valve detects a high outlet superheat, it increases its opening, increasing the flow rate. When the refrigerant flow rate increases, the amount of refrigerant increases, and the outlet superheat decreases. When the outlet superheat of the load evaporator is low, the thermal expansion valve opening decreases, decreasing the flow rate. When the refrigerant flow rate decreases, the amount of refrigerant decreases, and the outlet superheat increases. This method controls the outlet superheat of the load evaporator within a relatively stable range. However, the thermal expansion valve controls the outlet superheat of the load evaporator at a fixed value, typically 5-10°C. When the load evaporator reaches a high temperature, the outlet temperature of the load evaporator reaches a wide range, with the outlet superheat reaching 40-50°C. In this case, the thermal expansion valve opening remains at its maximum value, losing its ability to regulate the refrigerant flow rate, and therefore the superheat.

[0039] To solve the above problems, see Figure 1 One embodiment of the present application provides a refrigeration system 100, comprising a first refrigeration module 10. The first refrigeration module 10 includes a first compressor 11, a first condenser 12, at least one throttling assembly 13, and at least one load evaporator 14. The throttling assembly 13 and the load evaporator 14 are arranged in a one-to-one correspondence, that is, the number of throttling assemblies 13 and the number of load evaporators 14 are equal, and one throttling assembly 13 corresponds to one load evaporator 14.

[0040] In some specific embodiments, the first refrigeration module 10 includes one throttling assembly 13. In this case, there is also one load evaporator 14, and the refrigeration system 100 is a single-load refrigeration system. In other specific embodiments, the first refrigeration module 10 includes two throttling assemblies 13. In this case, there are two load evaporators 14, one load evaporator 14 corresponds to one throttling assembly 13, and the other load evaporator 14 corresponds to the other throttling assembly 13. In this case, the refrigeration system 100 is a multi-load refrigeration system. It is conceivable that in other specific embodiments, there are more than two throttling assemblies 13 and more than two load evaporators 14. In this case, the refrigeration system 100 is also a multi-load refrigeration system.

[0041] A first compressor 11, a first condenser 12, a throttling assembly 13, and a load evaporator 14 are sequentially connected to form a first closed loop. During operation, the refrigerant circulates through the first compressor 11, the first condenser 12, the throttling assembly 13, and the load evaporator 14. As the refrigerant flows through the load evaporator 14, it exchanges heat with the electronic components, thereby controlling the temperature of the electronic components. Optionally, the electronic components are chips. Of course, in other embodiments, the types of electronic components are not limited, such as resistors or diodes.

[0042] The throttling assembly 13 includes at least two thermal expansion valves connected in parallel and / or in series. The temperature sensing bulb 133 of each thermal expansion valve is used to detect the temperature at the outlet of the corresponding load evaporator 14. In other words, the throttling assembly 13 can include at least two thermal expansion valves connected in parallel, at least two thermal expansion valves connected in series, or at least two thermal expansion valves connected in a hybrid (a combination of parallel and series). Regardless of whether the thermal expansion valves included in the throttling assembly 13 are connected in series, parallel, or hybrid, the temperature sensing bulbs 133 of all thermal expansion valves belonging to the same throttling assembly 13 are used to detect the temperature at the outlet of the corresponding load evaporator 14.

[0043] The at least two thermal expansion valves included in the throttling assembly 13 have different controllable superheat ranges. That is, the at least two thermal expansion valves included in the throttling assembly 13 are of different models. For example, when the throttling assembly 13 includes two thermal expansion valves, the two thermal expansion valves are of two different models. In other words, when the temperature sensing bulbs 133 of the thermal expansion valves included in the throttling assembly 13 sense the same temperature change, the opening changes of the respective thermal expansion valves differ. This can be understood as different valve opening k-temperature bulb temperature T curves, with the slope of the curves ΔK / ΔT corresponding to the relative size of the adjustable superheat range of the thermal expansion valve.

[0044] The temperature sensing principle of the temperature sensing package 133 of the thermal expansion valve is as follows:

[0045] The temperature-sensing package 133 contains a special medium, which, like refrigerant, is in liquid or gaseous form. A diaphragm is installed within the thermal expansion valve, isolating the interior of the thermal expansion valve into two independent spaces. The diaphragm is movable, and this movement drives the valve core of the thermal expansion valve, thereby controlling the cross-sectional area of ​​refrigerant flowing through the thermal expansion valve. The movement of the diaphragm is directly affected by the pressure in the two spaces it isolates. The medium within the temperature-sensing package 133 is connected to one side of the diaphragm via a capillary tube, and the other side of the diaphragm is connected to a location within the refrigeration system 100. This location can be flexibly set via the pressure sensing point of the thermal expansion valve.

[0046] The temperature-sensing bulb 133 is in physical contact with the pipeline of the refrigeration system 100 (the pipeline is located at the output end of the load evaporator 14), and the medium in the temperature-sensing bulb 133 is isolated from the refrigerant of the refrigeration system 100. When the temperature of the refrigerant in the refrigeration system 100 changes, the temperature of the pipeline of the refrigeration system 100 changes accordingly, and the temperature of the medium in the temperature-sensing bulb 133 also changes accordingly. When the temperature of the medium changes, it will evaporate from liquid to gas, or condense from gas to liquid, or remain in a two-phase state, and the liquid-gas phase ratio of the two-phase state changes with the change of temperature. The change of the liquid-gas phase in the temperature-sensing bulb 133 eventually causes the pressure of the enclosed medium of the temperature-sensing bulb 133 to change, and the diaphragm moves, thereby changing the size of the refrigerant flow cross-sectional area of ​​the thermal expansion valve, that is, the opening of the thermal expansion valve is changed, and the outlet superheat of the load evaporator 14 is adjusted.

[0047] Thermal expansion valves come in two types: internally balanced and externally balanced. The primary difference lies in the type of pressure sensing point. The pressure sensing point for an externally balanced thermal expansion valve is set as described above. For an internally balanced thermal expansion valve, the pressure sensing point cannot be flexibly set; it is built into the thermal expansion valve, specifically at the outlet. This application does not specify any specific restrictions on thermal expansion valves; both externally and internally balanced options are acceptable.

[0048] In the refrigeration system 100 provided in the embodiment of the present application, the temperature-sensing bulb 133 of each thermal expansion valve of the throttling assembly 13 can detect the temperature of the outlet of the corresponding load evaporator 14, that is, when the temperature of the refrigerant at the outlet of the load evaporator 14 changes, the phase of the medium in the temperature-sensing bulb 133 changes accordingly, thereby causing the opening of the thermal expansion valve to change accordingly. In this way, the opening of the thermal expansion valve can be adaptively adjusted as the outlet superheat of the load evaporator 14 changes, thereby achieving the purpose of adjusting the outlet superheat of the load evaporator 14. In addition, since the throttling assembly 13 includes at least two thermal expansion valves, the controllable superheat ranges of the two thermal expansion valves are different. Compared with the case of using one thermal expansion valve in the prior art, the at least two thermal expansion valves cooperate with each other to expand the adjustment range of the outlet superheat of the load evaporator 14, which can meet the demand for adjusting the superheat in a wide range.

[0049] In some embodiments, see Figure 1 The first refrigeration module 10 further includes an electronic expansion valve 15, which is provided in the first closed circuit and located between the output end of the first condenser 12 and the input end of each throttling assembly 13. The electronic expansion valve 15 serves as the main throttling valve 23 of the first closed circuit, and is used to expand and reduce the pressure of the refrigerant in the first closed circuit.

[0050] Continue reading Figure 1, the first compressor 11 is connected to the first condenser 12 to form a main refrigeration circuit 16. A throttling component 13 and a load evaporator 14 are connected to form a refrigeration branch circuit 17. The first refrigeration module 10 includes multiple refrigeration branches 17. Each refrigeration branch 17 is connected to the main refrigeration circuit 16 to form a first closed loop. The temperature sensing package 133 of the thermal expansion valve of each refrigeration main circuit 16 is used to detect the temperature of the output end of the refrigeration branch 17. At this time, the refrigeration system 100 forms a multi-load refrigeration system for temperature control of more electronic components. Since each throttling component 13 includes at least two thermal expansion valves with different controllable superheat ranges, when the production temperature range of multiple load evaporators 14 is relatively wide, the thermal expansion valves of each throttling component 13 cooperate with each other to automatically control the refrigerant flow of different load evaporators 14, so that the refrigerant flow is evenly distributed.

[0051] Of course, in some other embodiments, the first refrigeration module 10 may also include only one throttling component 13 and one load evaporator 14. In this case, the refrigeration system 100 is a single-load refrigeration system.

[0052] In some embodiments, see Figure 1 and Figure 2 Each throttling assembly 13 includes at least two parallel-connected thermal expansion valves, each controlling a different superheat range. Thus, the parallel-connected thermal expansion valves cooperate to achieve a wide range of control over the outlet superheat of the load evaporator 14.

[0053] In some specific embodiments, see Figure 2 The throttling assembly 13 includes at least a first thermal expansion valve 131 and a second thermal expansion valve 132. The first thermal expansion valve 131 has a larger controllable superheat range than the second thermal expansion valve 132. The first thermal expansion valve 131 is used to adaptively adjust the outlet superheat of the corresponding load evaporator 14 under high-temperature conditions, while the second thermal expansion valve 132 is used to adaptively adjust the outlet superheat of the corresponding load evaporator 14 under low-temperature conditions.

[0054] It should be noted that when the thermal expansion valves are connected in parallel, each first closed loop includes multiple sub-circuits, and the first compressor 11, the first condenser 12, one thermal expansion valve and the load evaporator 14 form a sub-circuit.

[0055] In some specific embodiments, the first thermal expansion valve 131 and the second thermal expansion valve 132 are connected in parallel, and the temperature-sensing packages 133 of the two thermal expansion valves are both arranged at the outlet end of the corresponding load evaporator 14. Optionally, the temperature-sensing packages 133 of the two thermal expansion valves can be arranged at the same position of the outlet end of the load evaporator 14, or can be arranged at different positions. When the load evaporator 14 operates in a low-temperature condition (lower production temperature), the outlet superheat of the load evaporator 14 is relatively small, and the second thermal expansion valve 132 intervenes to adjust the outlet superheat of the load evaporator 14 to a suitable superheat range for stable operation. Under low-temperature conditions, since the outlet superheat of the load evaporator 14 is relatively small, it cannot reach the superheat range adjusted by the first thermal expansion valve 131. At this time, the opening of the first thermal expansion valve 131 continues to decrease, and is in a minimum opening or closed state. When the load evaporator 14 operates at a high temperature, the outlet superheat of the load evaporator 14 is relatively high. The first thermal expansion valve 131 intervenes to regulate the outlet superheat of the load evaporator 14 to within an appropriate superheat range for stable operation. Under high-temperature conditions, due to the high outlet superheat of the load evaporator 14, the second thermal expansion valve 132 is unable to meet the superheat regulation requirements. At this point, the opening of the second thermal expansion valve 132 continues to increase, reaching its maximum opening.

[0056] It is worth noting that in some other embodiments, the throttling assembly 13 may further include other thermal expansion valves, such as a third thermal expansion valve and a fourth thermal expansion valve, wherein the controllable superheat range of the third thermal expansion valve is greater than that of the first thermal expansion valve 131, and the controllable superheat range of the fourth thermal expansion valve is smaller than that of the second thermal expansion valve 132. In this case, the third thermal expansion valve is used to adaptively adjust the outlet superheat of the corresponding load evaporator 14 under higher temperature conditions, and the fourth thermal expansion valve is used to adaptively adjust the outlet superheat of the corresponding load evaporator 14 under lower temperature conditions.

[0057] Further, see Figure 2 The throttling assembly 13 also includes a first resistance-increasing member 18. The first resistance-increasing member 18 is provided on the first parallel pipeline where the thermal expansion valve with a smaller controllable superheat range is located, so as to increase the flow group of the first parallel pipeline where the thermal expansion valve is located. Under high temperature conditions or higher temperature conditions, the thermal expansion valve with a smaller controllable superheat range is at its maximum opening. When the thermal expansion valve is at its maximum opening, the suction pressure of the refrigeration system 100 is too high and easily reaches the upper operating limit of the first compressor 11. By providing the first resistance-increasing member 18 on the first parallel pipeline where the thermal expansion valve with a smaller controllable superheat range is located, the resistance of the pipeline can be increased, so that the thermal expansion valve with a larger controllable superheat range can better regulate the refrigerant flow.

[0058] Optionally, the first resistance increasing member 18 is a capillary tube. Of course, in other embodiments, there is no limitation on the type of the first resistance increasing member 18, as long as it can increase the resistance on the first parallel pipeline.

[0059] Continue reading Figure 1 The throttling assembly 13 further includes a first control valve 19, which is installed in the first parallel pipeline where the thermal expansion valve with a smaller controllable superheat range is located. This valve controls the opening and closing of the first parallel pipeline. Under high-temperature or higher operating conditions, the first control valve 19 disconnects the first parallel pipeline with a smaller controllable superheat range, preventing the thermal expansion valve with a smaller controllable superheat range from being at its maximum opening, which would cause excessive suction pressure and reach the upper operating limit of the first compressor 11.

[0060] It should be noted that when the throttling assembly 13 includes more than two thermal expansion valves, such as when the throttling assembly 13 includes three thermal expansion valves, the first control valve 19 and the first resistance-increasing member 18 may be provided on the first parallel pipelines of the two thermal expansion valves having smaller superheat ranges, or the first control valve 19 and the first resistance-increasing member 18 may be provided on the first parallel pipeline of the thermal expansion valve having the smallest superheat range. The same applies to the configuration in which the throttling assembly 13 includes more than three thermal expansion valves, which is not limited here.

[0061] In other embodiments, see Figure 3 and Figure 4 Each throttling assembly 13 includes at least two thermal expansion valves connected in series, each of which controls a different superheat range. Thus, the series-connected thermal expansion valves cooperate with each other to achieve a wide range of control over the outlet superheat of the load evaporator 14.

[0062] In some specific embodiments, the throttling assembly 13 includes a first thermal expansion valve 131 and a second thermal expansion valve 132, which are connected in series. When the load evaporator 14 operates at a low temperature, the second thermal expansion valve 132 intervenes to regulate the outlet superheat of the load evaporator 14 within an appropriate superheat range for stable operation, while the first thermal expansion valve 131 is at its minimum opening or closed. When the load evaporator 14 operates at a high temperature, the first thermal expansion valve 131 intervenes to regulate the outlet superheat of the load evaporator 14 within an appropriate superheat range for stable operation, while the second thermal expansion valve 132 is at its maximum opening.

[0063] Further, see Figure 3 The throttling assembly 13 includes a second resistance increasing member 101, which is connected in parallel with a thermal expansion valve with a larger controllable superheat range. Figure 4, the throttling component 13 also includes a second control valve 102, and the second control valve 102 is connected in parallel with the thermal expansion valve with a larger controllable superheat range. Alternatively, the throttling component 13 includes both a second resistance-increasing component 101 and a second control valve 102, and the second resistance-increasing component 101 and / or the second control valve 102 are arranged on a second parallel pipeline and are connected in parallel with the thermal expansion valve with a larger controllable superheat range through the second parallel pipeline. Optionally, the second resistance-increasing component 101 and the second control valve 102 are arranged on the same second parallel pipeline and are connected in parallel with the thermal expansion valve with a larger controllable superheat range through the second parallel pipeline. When the load evaporator 14 operates at a low temperature, the opening of the first thermal expansion valve 131 is at the minimum opening or closed state. In order to avoid blockage of the flow path, the thermal expansion valve with a larger controllable superheat range is connected in parallel, and the refrigerant flows to the load evaporator 14 through the second parallel pipeline where the second resistance-increasing component 101 and the second control valve 102 are located. Optionally, the second resistance increasing member 101 is a capillary tube.

[0064] It should be noted that there are some differences in the functions of the add-on components in the above two types of embodiments. When the first thermal expansion valve 131 and the second thermal expansion valve 132 are connected in parallel, the main function of the first resistance-increasing component 18 is to throttle the refrigerant in this path, so as to facilitate the adjustment of the first thermal expansion valve 131 in the other parallel path. When the first thermal expansion valve 131 and the second thermal expansion valve 132 are connected in series, the main function of the second add-on component 101 is to bypass and prevent the first thermal expansion valve 131 from blocking the series pipeline, while also providing a certain throttling effect to facilitate the adjustment of the second thermal expansion valve 132. In short, there are some similarities or differences in the actual functions of the add-on components in the two types of embodiments, but the fundamental purpose is to facilitate the adaptive adjustment of superheat by another thermal expansion valve (i.e., a thermal expansion valve other than the thermal expansion valve connected in series or in parallel with the add-on component in the throttling component 13).

[0065] It is worth noting that when the throttling assembly 13 includes more than two thermal expansion valves, for example, when the throttling assembly 13 includes three thermal expansion valves, the two thermal expansion valves with larger controllable superheat ranges can be connected in parallel with the second resistance-increasing member 101 and / or the second control valve 102, or the thermal expansion valve with the largest controllable superheat range can be connected in parallel with the second resistance-increasing member 101 and / or the second control valve 102. The same applies to the configuration in which the throttling assembly 13 includes more than three thermal expansion valves, which is not limited here.

[0066] In some embodiments, see Figure 2-Figure 4The refrigeration system 100 includes a second refrigeration module 20, which includes a second compressor 21, a second condenser 22, a throttle valve 23, and the first condenser 12. The second compressor 21, the second condenser 22, the throttle valve 23, and the first condenser 12 are sequentially connected 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. When the second closed loop is in operation, the refrigerant circulates through the second compressor 21, the second condenser 22, the throttle valve 23, and the first condenser 12. When the refrigerant flows through the first condenser 12, it can exchange heat with the first closed loop, thereby reducing the temperature of the refrigerant in the first closed loop.

[0067] Because the refrigeration system 100 includes not only the first refrigeration module 10 but also the second refrigeration module 20, the refrigeration system 100 is a two-stage cascade refrigeration system, in which the first refrigeration module 10 is a low-temperature refrigeration module and the second refrigeration module 20 is a high-temperature refrigeration module. It is understood that in other embodiments, the refrigeration system 100 may further include a third refrigeration module and a fourth refrigeration module, with the third refrigeration module used to dissipate heat from the second refrigeration module 20 and the fourth refrigeration module used to dissipate heat from the third refrigeration module. In this case, the refrigeration system 100 is a four-stage refrigeration system. In this application, the level of the refrigeration system 100 is not limited; for example, the refrigeration system 100 may also be a single-stage refrigeration system comprising only the first refrigeration module 10.

[0068] Another embodiment of the present application further provides a testing and sorting device, including the above-mentioned refrigeration system 100. Since the above-mentioned refrigeration system 100 has beneficial effects, the testing and sorting device including the refrigeration system 100 has the same beneficial effects, which will not be described in detail here.

[0069] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0070] The above-described embodiments merely represent several implementations of the present invention. 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 a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A refrigeration system, characterized in that: include: A first refrigeration module (10) comprises a first compressor (11), a first condenser (12), at least one throttling assembly (13) and at least one load evaporator (14), wherein the throttling assembly (13) and the load evaporator (14) are arranged in a one-to-one correspondence; the first compressor (11), the first condenser (12), one throttling assembly (13) and one load evaporator (14) are sequentially connected to form a first closed loop; The throttling assembly (13) comprises at least two thermal expansion valves connected in parallel and / or in series, and the temperature sensing package (133) of each thermal expansion valve is used to detect the temperature of the outlet end of the corresponding load evaporator (14); The controllable superheat ranges of at least two thermal expansion valves included in the throttling component (13) are different.

2. The refrigeration system according to claim 1, characterized in that The throttling component (13) comprises at least a first thermal expansion valve (131) and a second thermal expansion valve (132); the controllable superheat range of the first thermal expansion valve (131) is greater than that of the second thermal expansion valve (132); the first thermal expansion valve (131) is used to adaptively adjust the outlet superheat of the corresponding load evaporator (14) under high-temperature working conditions, and the second thermal expansion valve (132) is used to adaptively adjust the outlet superheat of the corresponding load evaporator (14) under low-temperature working conditions.

3. The refrigeration system according to claim 1, wherein: The first compressor (11) is connected to the first condenser (12) to form a main refrigeration circuit (16); One of the throttling components (13) and one of the load evaporators (14) are connected to form a refrigeration branch (17), and the first refrigeration module (10) includes a plurality of the refrigeration branches (17); Each of the refrigeration branches (17) is connected to the refrigeration main circuit (16) to form a first closed loop, and the temperature sensing package (133) of the thermal expansion valve of each of the refrigeration main circuits (16) is used to detect the temperature of the output end of the refrigeration branch (17).

4. The refrigeration system according to claim 1, wherein: Each of the throttling components (13) includes at least two thermal expansion valves connected in parallel.

5. The refrigeration system according to claim 4, characterized in that The throttling assembly (13) further comprises a first resistance increasing member (18), the first resistance increasing member (18) being arranged on a first parallel pipeline where the thermal expansion valve having a smaller controllable superheat range is located, so as to increase the flow resistance of the first parallel pipeline where the thermal expansion valve is located; and / or The throttling assembly (13) further comprises a first control valve (19), which is arranged on a first parallel pipeline where the thermal expansion valve having a smaller controllable superheat range is located, so as to control the on-off of the first parallel pipeline where the thermal expansion valve is located.

6. The refrigeration system according to claim 1, wherein: Each of the throttling components (13) includes at least two thermal expansion valves connected in series.

7. The refrigeration system according to claim 6, characterized in that The throttling assembly (13) further comprises a second resistance increasing member (101), the second resistance increasing member (101) being connected in parallel with the thermal expansion valve having a larger controllable superheat range; and / or The throttling assembly (13) further comprises a second control valve (102), which is connected in parallel with the thermal expansion valve having a larger controllable superheat range.

8. The refrigeration system according to claim 7, characterized in that The second resistance increasing member (101) and / or the second control valve (102) are arranged on a second parallel pipeline and are connected in parallel with the thermal expansion valve having a larger controllable superheat range via the second parallel pipeline.

9. The refrigeration system according to claim 5, characterized in that The first resistance increasing component (18) is a capillary tube.

10. The refrigeration system according to claim 7, wherein: The second resistance increasing component (101) is a capillary tube.

11. The refrigeration system according to claim 1, wherein: The first refrigeration module (10) further comprises an electronic expansion valve (15), the electronic expansion valve (15) being provided on the first closed circuit and being located between the output end of the first condenser (12) and the input end of each of the throttling components (13); and / or The refrigeration system further comprises a second refrigeration module (20), comprising a second compressor (21), a second condenser (22), a throttle valve (23) and the first condenser (12) which are sequentially connected to form a second closed loop, wherein the first condenser (12) is an evaporative condenser.

12. A test and sorting device, characterized in that: The refrigeration system comprises the refrigeration system according to any one of claims 1 to 11.

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