Refrigeration system

Abstract

The utility model relates to a refrigerating system, which is characterized in that a first refrigerating module comprises a refrigerating main path which comprises a first compressor and a first condenser which are communicated with each other; each refrigeration branch comprises a first throttle valve and a heat exchanger, the input end of the first throttle valve is communicated with the output end of the first condenser, the output end of the first throttle valve is communicated with the input end of the heat exchanger, and the output end of the heat exchanger is communicated with the input end of the first compressor; each first detection device is used for detecting the temperature of a refrigerant at the first position of the corresponding refrigeration branch, and the first position is located between the heat exchanger and the output end of the corresponding refrigeration branch. The second detection device is used for detecting the pressure of the refrigerant of the first pipeline; the first pipeline is a part of the refrigeration main path between a confluence point and the input end of the first compressor, and the confluence point is located at the intersection of the output ends of the at least two refrigeration branch paths and the refrigeration main path.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control, in particular to a refrigeration system. Background Art

[0002] With the development of economy and the progress of society, electronic components are widely used in various fields. Before electronic components are put into use, their reliability and stability under various ambient temperatures need to be tested. The test equipment generally includes a refrigeration system and a heating system. The refrigeration system is used as a cold source, and the heating system is used as a heat source. The temperature of the test environment is controlled by the heat and cold confrontation between the heat source and the cold source.

[0003] The refrigeration system includes a first compressor, a first condenser, a throttle valve and a heat exchanger. The heat exchanger, as the load end of the refrigeration system, performs heat exchange with the electronic components to control the temperature of the electronic components. In some refrigeration systems, there are multiple heat exchangers. The refrigerant flowing out of the first condenser is throttled by the throttle valve and then divided into multiple heat exchangers, so as to achieve the purpose of controlling multiple heat exchangers by one refrigeration system.

[0004] However, when the refrigeration system has multiple heat exchangers, unreasonable flow distribution is very likely to occur when the refrigerant enters multiple heat exchangers through the throttle valve. When the refrigerant distribution is unreasonable, the refrigerant in the heat exchanger with less flow distribution will evaporate quickly in its flow channel and overheat prematurely, resulting in poor temperature uniformity of the heat exchanger and failure to meet production needs. At the same time, the heat exchanger with more flow distribution has a strong cooling capacity, so that when the heating system that cooperates with it runs at full power, the heat exchanger cannot reach the production temperature; and the heat exchanger with less cold distribution cannot reach the production temperature even if the heating system is not running, and cannot meet production needs. Utility Model Content

[0005] Based on this, it is necessary to provide a refrigeration system with more reasonable refrigerant distribution to meet production needs in order to solve the problem that the refrigerant flow distribution of the refrigeration system with multiple heat exchangers is unreasonable and cannot meet production needs.

[0006] A refrigeration system includes a first refrigeration module, wherein the first refrigeration module includes:

[0007] A refrigeration main circuit, comprising a first compressor and a first condenser connected to each other;

[0008] At least two refrigeration branches, each of the refrigeration branches comprises a first throttle valve and a heat exchanger, the input end of the first throttle valve is connected to the output end of the first condenser, the output end of the first throttle valve is connected to the input end of the heat exchanger, and the output end of the heat exchanger is connected to the input end of the first compressor;

[0009] at least two first detection devices, each of which is used to detect the temperature of the refrigerant at a first position corresponding to the refrigeration branch, the first position being located between the heat exchanger and an output end corresponding to the refrigeration branch; and

[0010] The second detection device is used to detect the pressure of the refrigerant in the first pipeline; the first pipeline is the part of the refrigeration main circuit between the confluence point and the input end of the first compressor, and the confluence point is located at the intersection of the output ends of at least two of the refrigeration branches and the refrigeration main circuit.

[0011] In the above refrigeration system, each refrigeration branch is provided with a first throttle valve, the first detection device can measure the evaporation temperature, the pressure measured by the second detection device can be converted into the saturation temperature under the pressure, the first detection device and the second detection device can cooperate to know the superheat of the heat exchanger outlet of each refrigeration branch, and the superheat of each refrigeration branch is calculated based on a unified saturation temperature, and the opening of each first throttle valve is adjusted according to the superheat, so that the superheat of each heat exchanger is finally controlled within a certain deviation range. In this way, the unreasonable distribution of refrigerant flow is avoided and the temperature uniformity of the heat exchanger is ensured. At the same time, due to the reasonable distribution of refrigerant flow, each refrigeration branch cooperates with the heating system to meet production needs.

[0012] In one of the embodiments, each of the first detection devices includes a first temperature sensor, and each of the first temperature sensors is used to detect the temperature of the refrigerant at the first position corresponding to the refrigeration branch.

[0013] In one of the embodiments, the first throttle valve is a thermal expansion valve;

[0014] Each of the thermal expansion valves has a temperature sensing package, and each of the temperature sensing packages corresponds to the first detection device of the refrigeration branch;

[0015] and / or

[0016] At least one of the thermal expansion valves has a pressure sensing point, and at least one of the pressure sensing points serves as the second detection device for detecting the pressure of the refrigerant in the first pipeline.

[0017] In one embodiment, the second detection device includes a pressure sensor, and the pressure sensor is used to detect the pressure of the refrigerant in the first pipeline.

[0018] In one embodiment, a controller is also included;

[0019] The first throttle valve is an electronic expansion valve;

[0020] The electronic expansion valve, the first detection device and the second detection device are electrically connected to the controller respectively.

[0021] In one embodiment, each of the refrigeration branches further includes a regenerator, the regenerator having a first flow channel and a second flow channel; the input end of the first throttle valve is connected to the output end of the first condenser through the first flow channel, the output end of the heat exchanger is connected to the input end of the first compressor through the second flow channel, and the refrigerant in the first flow channel exchanges heat with the refrigerant in the second flow channel; or

[0022] Each of the refrigeration branches further includes a regenerator, the regenerator having a first flow channel and a second flow channel; the output end of the first throttle valve is connected to the input end of the heat exchanger through the first flow channel, the output end of the heat exchanger is connected to the input end of the first compressor through the second flow channel, and the first flow channel exchanges heat with the refrigerant in the second flow channel;

[0023] Wherein, the first position is located between the heat regenerator and the output end corresponding to the refrigeration branch.

[0024] In one of the embodiments, each of the refrigeration branches is provided with a bypass pipeline, and two ends of the bypass pipeline are respectively connected to the input end and the output end of the first throttle valve.

[0025] In one embodiment, the bypass line is a capillary line.

[0026] In one of the embodiments, the main refrigeration circuit further includes a second throttle valve, and the second throttle valve is connected between the output end of the first condenser and the input ends of at least two of the refrigeration branches.

[0027] In one embodiment, the first refrigeration module further includes a first stop valve, which is arranged between the main refrigeration circuit and the input ends of at least two of the refrigeration branches to control the connection and disconnection of the main refrigeration circuit and the refrigeration branches; and / or

[0028] The first refrigeration module further includes a second stop valve, which is arranged between the main refrigeration circuit and output ends of at least two of the refrigeration branches to control the connection and disconnection of the main refrigeration circuit and the refrigeration branches.

[0029] In one embodiment, the refrigeration system further includes at least one level of second refrigeration module, each level of the second refrigeration module includes a second compressor, a second condenser, a third throttle valve and an evaporator which are sequentially connected to form a second refrigeration circuit, and the second condenser and the evaporator of two adjacent levels of the second refrigeration modules are integrated into one to form a first evaporative condenser;

[0030] The first condenser of the first refrigeration module and the evaporator of the second refrigeration module at the lowest temperature level are integrated into a second evaporative condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a refrigeration system provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of a partial structure of a refrigeration system provided in another embodiment of the present application;

[0033] Figure 3 A schematic diagram of a refrigeration system provided in yet another embodiment of the present application;

[0034] Figure 4 A schematic diagram of a partial structure of a refrigeration system provided in yet another embodiment of the present application;

[0035] Figure 5 A schematic diagram of the partial structure of a refrigeration system provided in yet another embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1000, refrigeration system; 100, first refrigeration module; 10, refrigeration main circuit; 11, first compressor; 12, first condenser; 13, first pipeline; 14, second throttle valve; 20, refrigeration branch circuit; 21, first throttle valve; 211, temperature sensing package; 212, pressure sensing point; 22, heat exchanger; 24, regenerator; 31, first temperature sensor; 32, pressure sensor; 40, bypass pipeline; 50, first stop valve; 60, second stop valve; 70, liquid distributor; 200, second refrigeration module; 201, second compressor; 202, second condenser; 203, third throttle valve; 204, evaporator; 300, refrigerant circuit; 301, cold source; 302, refrigerant pipeline; A, confluence point. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the 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 violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0039] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] 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 a central 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 a central element at the same time. 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 method.

[0044] See also Figure 1 In one embodiment of the present application, a refrigeration system 1000 is provided for refrigerating electronic components, so as to cooperate with a heating system to control the temperature of the electronic components. Specifically, the electronic components are chips, and the refrigeration system 1000 is used for refrigerating the chips, so as to cooperate with a heating system to control the temperature of the chips. Of course, in other embodiments, there is no limitation on the types of electronic components that the refrigeration system 1000 is used for refrigeration.

[0045] The refrigeration system 1000 includes a first refrigeration module 100, which includes a refrigeration main circuit 10 and at least two refrigeration branches 20. The refrigeration branches 20 are branches of the refrigeration main circuit 10, and the input and output ends of each refrigeration branch 20 are connected to the refrigeration main circuit 10.

[0046] The refrigeration main circuit 10 includes a first compressor 11 and a first condenser 12. The output end of the first compressor 11 is connected to the input end of the first condenser 12. Each refrigeration branch 20 includes a first throttle valve 21 and a heat exchanger 22. The input end of the first throttle valve 21 is connected to the output end of the first condenser 12, the output end of the first throttle valve 21 is connected to the input end of the heat exchanger 22, and the output end of the heat exchanger 22 is connected to the input end of the first compressor 11. In this way, the first compressor 11, the first condenser 12, the first throttle valve 21 of each refrigeration branch 20, and the heat exchanger 22 together form a first refrigeration circuit, that is, a first refrigeration circuit will be formed corresponding to one refrigeration branch 20.

[0047] When the first refrigeration circuit is working, the first compressor 11 sucks the high-temperature, low-pressure refrigerant gas output from the output end of the heat exchanger 22, compresses the refrigerant into a high-temperature, high-pressure refrigerant gas, and discharges it from the output end of the first compressor 11 to the first condenser 12. When the refrigerant passes through the first condenser 12, it is condensed into a medium-temperature, high-pressure refrigerant liquid by the first condenser 12, and is expanded and reduced in pressure to a low-temperature, low-pressure refrigerant liquid through the first throttle valve 21, and finally input into the heat exchanger 22 from the input end of the heat exchanger 22. When the low-temperature, low-pressure liquid refrigerant enters the heat exchanger 22, it exchanges heat with the electronic components to control the temperature of the electronic components. The refrigerant after heat exchange enters the first compressor 11 again from the output end of the heat exchanger 22, and the cycle repeats.

[0048] The first refrigeration module 100 also includes at least two first detection devices, each of which is used to detect the temperature of the refrigerant at the first position of the corresponding refrigeration branch 20, and the first position is located between the heat exchanger 22 and the output end of the corresponding refrigeration branch 20. That is, the number of the first detection devices is equal to the number of refrigeration branches 20 and corresponds one to one, and each first detection device is used to detect the temperature of the refrigerant at the first position of the refrigeration branch 20 corresponding to it. The first position of each refrigeration branch 20 is located on the heat exchanger 22, or between the output end (outlet) of the heat exchanger 22 and the intersection where the refrigeration branch 20 converges to the refrigeration main circuit 10. Generally, when the first position is located on the heat exchanger 22, it is located at the outlet position of the heat exchanger 22. The first detection device can obtain the evaporation temperature of each heat exchanger 22 by detecting the temperature of the first position.

[0049] The first refrigeration module 100 further includes a second detection device, which is used to detect the pressure of the refrigerant in the first pipeline 13. The first pipeline 13 is a portion of the refrigeration main circuit 10 between the confluence point A and the input end of the first compressor 11, and the confluence point A is located at the intersection of the output ends of at least two refrigeration branches 20 and the refrigeration main circuit 10.

[0050] It should be noted that the confluence point A means that when the output ends of all refrigeration branches 20 intersect with the refrigeration main circuit 10 at one point, the point forms the confluence point A; when the output ends of the refrigeration branches 20 and the intersection points of the refrigeration main circuit 10 are different, then the confluence point A is the intersection point closest to the input end of the first compressor 11. It should also be noted that the part of the refrigeration main circuit 10 between the confluence point A and the input end of the first compressor 11 includes the confluence point A and the input end of the first compressor 11, that is, the second detection device can detect the pressure of the refrigerant at the confluence point A and the input end of the first compressor 11.

[0051] Since the second detection device can detect the pressure of the refrigerant in the first pipeline 13, the saturation temperature of the refrigerant can be obtained through the pressure. The first detection device can detect the evaporation temperature of the heat exchanger 22. By calculating the difference between the evaporation temperature and the saturation temperature, the superheat of the refrigerant at the outlet of the heat exchanger 22 of each refrigeration branch 20 (referred to as the outlet superheat) can be known. By judging the size of the outlet superheat of the heat exchanger 22 corresponding to each refrigeration branch 20, the refrigerant distribution of each refrigeration branch 20 can be judged. When the outlet superheat of the heat exchanger 22 corresponding to a refrigeration branch 20 is large and exceeds a certain threshold, it proves that the refrigerant flow allocated to the heat exchanger 22 is small, and the opening of the corresponding first throttle valve 21 can be increased; and when the outlet superheat of the heat exchanger 22 corresponding to a refrigeration branch 20 is small and below a certain threshold, it proves that the refrigerant flow allocated to the heat exchanger 22 is large, and the opening of the corresponding first throttle valve 21 can be reduced. By adjusting the opening of each first throttle valve 21, the superheat of each heat exchanger 22 is ultimately controlled within a certain deviation range.

[0052] In the refrigeration system 1000 provided in the embodiment of the present application, each refrigeration branch 20 is provided with a first throttle valve 21, the first detection device can measure the evaporation temperature, the pressure measured by the second detection device can be converted into the saturation temperature under the pressure, the first detection device cooperates with the second detection device to know the outlet superheat of the heat exchanger 22 of each refrigeration branch 20, and the superheat of each refrigeration branch 20 is calculated based on a unified saturation temperature, and the opening of each first throttle valve 21 is adjusted according to the superheat, so that the superheat of each heat exchanger 22 is finally controlled within a certain deviation range. In this way, the unreasonable distribution of refrigerant flow is avoided, and the temperature uniformity of the heat exchanger 22 is ensured. At the same time, due to the reasonable distribution of refrigerant flow, each refrigeration branch 20 cooperates with the heating system to meet production needs.

[0053] In some embodiments, see Figure 1 The refrigeration main circuit 10 further includes a second throttle valve 14, which is connected between the output end of the first condenser 12 and the input ends of at least two refrigeration branches 20. In this way, the second throttle valve 14 can cooperate with each first throttle valve 21 to adjust the flow rate of the refrigerant, so that the refrigerant flow distribution is more reasonable, and finally the superheat of each heat exchanger 22 is controlled within a certain deviation range.

[0054] It should be noted that, generally, when the refrigerant flow of the heat exchanger 22 is adjusted, the second throttle valve 14 remains at a set opening. Therefore, in some other embodiments, the second throttle valve 14 may be omitted from the main refrigeration circuit 10 .

[0055] The first refrigeration module 100 further includes a liquid distributor 70 , which is disposed at an output end of the second throttle valve 14 to distribute the refrigerant into each refrigeration branch 20 .

[0056] In some embodiments, the first throttle valve 21 is a thermal expansion valve, each of which has a temperature-sensing package 211, and each temperature-sensing package 211 corresponds to the first detection device of the refrigeration branch 20. That is, the temperature-sensing package 211 of each thermal expansion valve serves as a first detection device for detecting the temperature of the refrigerant at the first position of the refrigeration branch 20. At least one thermal expansion valve has a pressure sensing point 212, and at least one pressure sensing point 212 serves as a second detection device for detecting the pressure of the refrigerant in the first pipeline 13. Specifically, each thermal expansion valve has a pressure sensing point 212, and each pressure sensing point 212 can detect the pressure of the refrigerant in the first pipeline 13. Since the thermal expansion valve is equipped with a temperature-sensing package 211 and a pressure sensing point 212, the refrigeration system 1000 does not need to set up additional electronic control equipment to control the opening of the controller, and the thermal expansion valve can automatically sense and adjust automatically, thereby simplifying the structure of the refrigeration system 1000.

[0057] As in some specific embodiments, the first refrigeration module 100 includes two refrigeration branches 20, namely the first refrigeration branch 20 and the second refrigeration branch 20. When the refrigerant of the two refrigeration branches 20 is unevenly distributed, it is assumed that the refrigeration flow of the first refrigeration branch 20 is large and the flow of the refrigerant of the second refrigeration branch 20 is small. When the production temperature is the same, the outlet superheat of the heat exchanger 22 of the first refrigeration branch 20 will be smaller, and the outlet superheat of the heat exchanger 22 of the second refrigeration branch 20 will be larger. If the outlet superheat of the heat exchanger 22 of the first refrigeration branch 20 is less than the set value of the thermal expansion valve, the opening of the thermal expansion valve will decrease, and the refrigerant flow of the circuit will decrease. At this time, the heat exchange amount will decrease, and the outlet superheat of the heat exchanger 22 of the first refrigeration branch 20 will gradually increase until the superheat setting value is reached. If the outlet superheat of the heat exchanger 22 of the second refrigeration branch 20 is greater than the set value of the thermal expansion valve, the opening of the thermal expansion valve will increase, the refrigerant flow rate of the circuit will increase, and the heat exchange amount will increase. The outlet superheat of the heat exchanger 22 of the second refrigeration branch 20 will gradually decrease until it reaches the set value of the superheat. In this way, the refrigerants in the two refrigeration branches 20 reach the same superheat state.

[0058] In some other embodiments, the refrigeration system 1000 further includes a controller, and the first throttle valve 21 is an electronic expansion valve. The electronic expansion valve, the first detection device, and the second detection device are electrically connected to the controller, respectively. In this way, the first detection device and the second detection device transmit the temperature signal and the pressure signal to the controller, respectively. The controller calculates the actual superheat according to the temperature signal and the pressure signal, and determines the actual superheat of each refrigeration branch, thereby controlling each electronic expansion valve to adjust the opening to maintain the superheat of each refrigeration branch within a certain deviation range.

[0059] For further information, see Figure 2 Each first detection device includes a first temperature sensor 31, and each first temperature sensor 31 is used to detect the temperature of the refrigerant at the first position of the corresponding refrigeration branch 20. The second detection device includes a pressure sensor 32, and the pressure sensor 32 is used to detect the pressure of the refrigerant in the first pipeline 13, and obtain the saturation temperature of the refrigerant through the pressure.

[0060] In some embodiments, see Figure 3 Each refrigeration branch 20 also includes a regenerator 24, which has a first flow channel and a second flow channel, which are not connected to each other, and the refrigerant flowing in the two flow channels can perform heat exchange. The input end of the first throttle valve 21 is connected to the output end of the first condenser 12 through the first flow channel, that is, the first flow channel has a first inlet and a first outlet that are connected to each other, the output end of the first condenser 12 is connected to the first inlet of the first flow channel, and the input end of the first throttle valve 21 is connected to the first outlet of the first flow channel. The output end of the heat exchanger 22 is connected to the input end of the first compressor 11 through the second flow channel, that is, the second flow channel has a second inlet and a second outlet that are connected to each other, the output end of the heat exchanger 22 is connected to the second inlet of the second flow channel, and the input end of the first compressor 11 is connected to the second outlet of the second flow channel. Among them, the first position is located between the regenerator 24 and the output end of the corresponding refrigeration branch 20.

[0061] The reheater 24 exchanges heat between the relatively high temperature refrigerant before entering the first throttle valve 21 and the relatively low temperature refrigerant output from the output end of the heat exchanger 22. At this time, the first throttle valve 21 controls the superheat of the outlet of the reheater 24 (the second outlet of the second flow channel). The refrigerant at the output end of the heat exchanger 22 is heated by the reheater 24 and reaches the second outlet of the reheater 24. The outlet superheat of the heat exchanger 22 is lower than the outlet superheat of the reheater 24, and the outlet superheat of the heat exchanger 22 can even be in a two-phase state. Therefore, by controlling the outlet superheat of the reheater 24, the outlet superheat of the heat exchanger 22 can be reduced, so that the refrigerant can operate at a low superheat or even in a two-phase state, so that the refrigerant temperature in the internal flow channel of the heat exchanger 22 will be relatively uniform, further improving the uniformity of the production temperature.

[0062] In some other embodiments, see Figure 4 , each refrigeration branch 20 further includes a regenerator 24, and the regenerator 24 has a first flow channel and a second flow channel. The first flow channel has a first inlet and a first outlet that are interconnected, and the second flow channel has a second inlet and a second outlet that are interconnected. The output end of the first throttle valve 21 is connected to the input end of the heat exchanger 22 through the first flow channel, that is, the output end of the first throttle valve 21 is connected to the first inlet of the first flow channel, and the input end of the heat exchanger 22 is connected to the first outlet of the first flow channel. The output end of the heat exchanger 22 is connected to the input end of the first compressor 11 through the second flow channel, that is, the output end of the heat exchanger 22 is connected to the second inlet of the second flow channel, and the input end of the first compressor 11 is connected to the second outlet of the heat exchanger 22. Among them, the first position is located between the regenerator 24 and the output end of the corresponding refrigeration branch 20. It can be seen that the difference between this embodiment and the above embodiment is that the setting position of the regenerator 24 is different. Similarly, the setting of the regenerator 24 in this embodiment can achieve the same purpose as the above embodiment.

[0063] In some embodiments, see Figure 5 Each refrigeration branch 20 is provided with a bypass line 40, and the two ends of the bypass line 40 are respectively connected to the input end and the output end of the first throttle valve 21. This arrangement can avoid the situation where the refrigerant cannot flow to the heat exchanger 22 due to the blockage inside the first throttle valve 21, which causes the system to fail to operate normally, and reduces the fluctuation degree of the refrigeration system 1000.

[0064] In some specific implementations, the bypass pipeline 40 is a capillary pipeline. It is conceivable that in other embodiments, the bypass pipeline 40 may also be a common pipeline that only serves as a connection, which is not limited here.

[0065] In some embodiments, the first refrigeration module 100 further includes a first stop valve 50, which is disposed between the main refrigeration circuit 10 and the input ends of at least two refrigeration branches 20, so as to control the on-off of the main refrigeration circuit 10 and the refrigeration branches 20. And / or the first refrigeration module 100 further includes a second stop valve 60, which is disposed between the main refrigeration circuit 10 and the output ends of at least two refrigeration branches 20, so as to control the on-off of the main refrigeration circuit 10 and the refrigeration branches 20.

[0066] Further reading Figure 1 and Figure 3, the refrigeration system 1000 also includes at least one level of second refrigeration module 200, and each level of second refrigeration module 200 includes a second compressor 201, a second condenser 202, a third throttle valve 203 and an evaporator 204 that are sequentially connected to form a second refrigeration circuit. The second condenser 202 and the evaporator 204 of two adjacent levels of second refrigeration modules 200 are integrated into a first evaporative condenser. The first condenser 12 of the first refrigeration module 100 and the evaporator 204 of the second refrigeration module 200 with the lowest temperature are integrated into a second evaporative condenser. At this time, the refrigeration system 1000 is at least a two-stage compression cascade refrigeration system 1000, and the second refrigeration module 200 is used for heat dissipation of the first condenser 12 of the first refrigeration module 100.

[0067] In a specific embodiment, the refrigeration system 1000 includes a first-level second refrigeration module 200. In this case, the refrigeration system 1000 is a two-stage compression cascade refrigeration system 1000. Among them, the second refrigeration module 200 is a high-temperature refrigeration module, and the first refrigeration module 100 is a low-temperature refrigeration module. When the second refrigeration circuit is working, the second compressor 201 sucks the high-temperature and low-pressure refrigerant gas output from the output end of the second evaporative condenser, compresses the refrigerant into a high-temperature and high-pressure refrigerant gas, and discharges it from the output end of the second compressor 201 to the second condenser 202. When the refrigerant passes through the second condenser 202, it is condensed into a medium-temperature and high-pressure refrigerant liquid by the second condenser 202, and is expanded and decompressed into a low-temperature and low-pressure refrigerant liquid through the third throttle valve 203, and finally input into the second evaporative condenser again from the input end of the second evaporative condenser. When the low-temperature and low-pressure liquid refrigerant enters the second evaporative condenser, it performs heat exchange with the first refrigeration circuit. The refrigerant after heat exchange enters the second compressor 201 again from the output end of the second evaporative condenser, and the cycle repeats.

[0068] It is conceivable that in some other embodiments, there is no limitation on the number of stages of the second refrigeration modules 200 included in the refrigeration system 1000 . For example, the refrigeration system 1000 may include two stages of second refrigeration modules 200 .

[0069] Continue reading Figure 3 , the refrigeration system 1000 also includes a cold source 301 and a coolant pipeline 302 which are sequentially connected to form a coolant loop 300, and the coolant pipeline 302 is thermally coupled to the second condenser 202. The coolant can flow to the coolant pipeline 302 through the cold source 301, and is used for heat dissipation of the second condenser 202. The coolant after heat dissipation can flow back to the cold source 301 through the coolant pipeline 302, and the cycle is repeated in sequence. Specifically, the coolant flowing in the coolant loop 300 is cooling water. Of course, in some other embodiments, the type of coolant is not limited.

[0070] The refrigeration system 1000 provided in the embodiment of the present application has the following beneficial effects:

[0071] 1. A thermal expansion valve is provided at the input end of each heat exchanger 22 to control the superheat at the output end (outlet) of the heat exchanger 22, automatically adjust the refrigerant flow of each refrigeration branch 20, improve the temperature distribution uniformity of the heat exchanger 22, and enhance production efficiency and stability.

[0072] 2. A reheater 24 is arranged before the input end or after the output end of the first throttle valve 21 of each refrigeration branch 20. The refrigerant output from the output end of the heat exchanger 22 is reheated in the reheater 24, which can reduce the outlet superheat of the heat exchanger 22, further improve the temperature uniformity of the heat exchanger 22, and improve production efficiency and stability.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0074] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A refrigeration system, characterized in that: The invention comprises a first refrigeration module (100), wherein the first refrigeration module (100) comprises: A refrigeration main circuit (10) comprises a first compressor (11) and a first condenser (12) which are interconnected; at least two refrigeration branches (20), each of the refrigeration branches (20) comprising a first throttle valve (21) and a heat exchanger (22), the input end of the first throttle valve (21) being connected to the output end of the first condenser (12), the output end of the first throttle valve (21) being connected to the input end of the heat exchanger (22), and the output end of the heat exchanger (22) being connected to the input end of the first compressor (11); at least two first detection devices, each of which is used to detect the temperature of the refrigerant at a first position corresponding to the refrigeration branch (20), the first position being located between the heat exchanger (22) and the output end corresponding to the refrigeration branch (20); and The second detection device is used to detect the pressure of the refrigerant in the first pipeline (13); the first pipeline (13) is the portion of the refrigeration main circuit (10) between the confluence point (A) and the input end of the first compressor (11), and the confluence point (A) is located at the intersection of the output ends of at least two of the refrigeration branches (20) and the refrigeration main circuit (10).

2. The refrigeration system according to claim 1, characterized in that: Each of the first detection devices comprises a first temperature sensor (31), and each of the first temperature sensors (31) is used to detect the temperature of the refrigerant at the first position corresponding to the refrigeration branch (20).

3. The refrigeration system according to claim 1, characterized in that: The first throttle valve (21) is a thermal expansion valve; Each of the thermal expansion valves has a temperature sensing package, and each of the temperature sensing packages corresponds to the first detection device of the refrigeration branch (20); and / or At least one of the thermal expansion valves has a pressure sensing point (212), and at least one of the pressure sensing points (212) serves as the second detection device, for detecting the pressure of the refrigerant in the first pipeline (13).

4. The refrigeration system according to claim 1, characterized in that: The second detection device comprises a pressure sensor (32), and the pressure sensor (32) is used to detect the pressure of the refrigerant in the first pipeline (13).

5. The refrigeration system according to claim 1, characterized in that: Also includes a controller; The first throttle valve (21) is an electronic expansion valve; The electronic expansion valve, the first detection device and the second detection device are electrically connected to the controller respectively.

6. The refrigeration system according to claim 1, characterized in that: Each of the refrigeration branches (20) further comprises a regenerator (24), the regenerator (24) having a first flow channel and a second flow channel; the input end of the first throttle valve (21) is connected to the output end of the first condenser (12) through the first flow channel, the output end of the heat exchanger (22) is connected to the input end of the first compressor (11) through the second flow channel, and the first flow channel exchanges heat with the refrigerant in the second flow channel; or Each of the refrigeration branches (20) further comprises a regenerator (24), the regenerator (24) having a first flow channel and a second flow channel; the output end of the first throttle valve (21) is connected to the input end of the heat exchanger (22) through the first flow channel, the output end of the heat exchanger (22) is connected to the input end of the first compressor (11) through the second flow channel, and the first flow channel exchanges heat with the refrigerant in the second flow channel; Wherein, the first position is located between the regenerator (24) and the output end corresponding to the refrigeration branch (20).

7. The refrigeration system according to claim 1, characterized in that: Each of the refrigeration branches (20) is provided with a bypass pipeline (40), and the two ends of the bypass pipeline (40) are respectively connected to the input end and the output end of the first throttle valve (21).

8. The refrigeration system according to claim 7, characterized in that: The bypass pipeline (40) is a capillary pipeline.

9. The refrigeration system according to claim 1, characterized in that: The refrigeration main circuit (10) further comprises a second throttle valve (14), wherein the second throttle valve (14) is connected between the output end of the first condenser (12) and the input ends of at least two of the refrigeration branches (20).

10. The refrigeration system according to claim 1, characterized in that: The first refrigeration module (100) further comprises a first stop valve (50), the first stop valve (50) being arranged between the main refrigeration circuit (10) and the input ends of at least two of the refrigeration branches (20) to control the connection and disconnection of the main refrigeration circuit (10) and the refrigeration branches (20); and / or The first refrigeration module (100) further comprises a second stop valve (60), the second stop valve (60) being arranged between the output ends of the main refrigeration circuit (10) and at least two of the refrigeration branches (20) so as to control the connection and disconnection of the main refrigeration circuit (10) and the refrigeration branches (20).

11. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises at least one level of second refrigeration module (200), wherein each level of the second refrigeration module (200) comprises a second compressor (201), a second condenser (202), a third throttle valve (203) and an evaporator (204) which are sequentially connected to form a second refrigeration circuit, and the second condenser (202) and the evaporator (204) of two adjacent levels of the second refrigeration modules (200) are integrated into one body to form a first evaporative condenser; The first condenser (12) of the first refrigeration module (100) and the evaporator (204) of the second refrigeration module (200) at the lowest temperature level are integrated into one body to form a second evaporative condenser.

Images