Refrigeration system

Abstract

The utility model relates to a refrigerating system which comprises a first refrigerating module, and the first refrigerating module comprises a first compressor, a first condenser and a first throttling valve. Each refrigeration branch comprises a second throttle valve and a heat exchanger, the output end of the first throttle valve is communicated with the input end of the second throttle valve, and the output end of the second throttle valve is communicated with the input end of the heat exchanger; the first detection devices are 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 output end of the heat exchanger and the confluence point; and the second detection device is used for detecting the temperature or pressure of the refrigerant at a second position in the first refrigeration module, and the second position is located between the output end of the first throttling valve and the input end of the second throttling valve of at least one refrigeration branch. According to the refrigerating system, the refrigerant flow distribution is reasonable, and the self-adaptive adjustment of the refrigerating capacity can be carried out.

Description

Technical Field

[0001] The present application relates to the field of temperature control technology, and 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 electronic components to control the temperature of the electronic components. In the refrigeration system, 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, which cannot 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 matched with it is running at full power, the heat exchanger cannot reach the production temperature; and the heat exchanger with less cold capacity distribution cannot reach the production temperature even if the heating system is not running, which cannot meet production needs. In addition, the refrigeration system cannot perform adaptive adjustment of the cooling capacity. The existence of the above-mentioned defects has led to the need for further optimization of the refrigeration system. Utility Model Content

[0005] Based on this, it is necessary to provide a refrigeration system with more reasonable refrigerant distribution and capable of adaptively adjusting the cooling capacity to meet production needs in order to address the problem that the refrigerant flow distribution of a refrigeration system with multiple heat exchangers is unreasonable and cannot meet production needs, and cannot achieve adaptive adjustment of the cooling capacity.

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

[0007] The first refrigeration main circuit includes a first compressor, a first condenser and a first throttle valve which are sequentially arranged and connected;

[0008] at least two refrigeration branches, the refrigeration branches comprising a second throttle valve and a heat exchanger, the output end of the first throttle valve being connected to the input end of the second throttle valve, the output end of the second throttle valve being connected to the input end of the heat exchanger, and the output end of the heat exchanger being connected to the input end of the first compressor;

[0009] at least two first detection devices, each of the first detection devices corresponds to the refrigeration branch one by one, and the first detection device is used to detect the temperature of the refrigerant at a first position of the corresponding refrigeration branch, the first position is located between the output end of the heat exchanger and the confluence point, and the confluence point is located at the connection between the output end of the refrigeration branch and the first refrigeration main circuit; and

[0010] a second detection device, used for detecting the temperature or pressure of the refrigerant at a second position in the first refrigeration module, wherein the second position is located between an output end of the first throttle valve and an input end of the second throttle valve of at least one of the refrigeration branches;

[0011] Wherein, the second throttle valve and the corresponding first detection device and the second detection device are all connected.

[0012] In some embodiments, the second detection device includes at least two temperature detection members, the temperature detection members correspond to the refrigeration branches one by one, and the temperature detection members are used to detect the temperature of the refrigerant at the second position of the corresponding refrigeration branch, the second position is located between the branch point and the input end of the second throttle valve, and the branch point is located at the connection between the first refrigeration main circuit and the input end of the refrigeration branch;

[0013] The second throttle valve is connected to the first detection device corresponding thereto, and is connected to the temperature detection element corresponding thereto.

[0014] In some embodiments, the second throttle valve is a thermal expansion valve, the first refrigeration module includes at least two temperature sensing bags, the temperature sensing bags correspond to the refrigeration branches one by one, the temperature sensing bags are constructed to form the first detection device and the temperature detection element, and are used to detect the temperature of the first position and the second position, and the temperature sensing bag is mechanically connected to the thermal expansion valve.

[0015] In some embodiments, the refrigeration branch includes a first pipeline and a second pipeline, the first pipeline is connected between the output end of the heat exchanger and the confluence point, and the second pipeline is connected between the diversion point and the input end of the second throttle valve;

[0016] The first position is located on the outer wall of the first pipeline, the second position is located on the outer wall of the second pipeline, and two temperature sensing surfaces of the temperature sensing package are respectively attached to the outer wall of the first pipeline and the outer wall of the second pipeline.

[0017] In some embodiments, the temperature sensing package is clamped between the first pipeline and the second pipeline.

[0018] In some embodiments, the second detection device is a pressure detection device, and the second detection device is used to detect the pressure of a diversion point, and the diversion point is located at the connection between the first refrigeration main circuit and the input end of the refrigeration branch circuit.

[0019] In some embodiments, the second throttle valve is a thermal expansion valve, and the first detection device is a temperature sensing package;

[0020] The second detection device comprises at least two pressure balance tubes, each of which is connected to the diversion point;

[0021] The pressure balance pipe corresponds to the refrigeration branch one by one, and the two sides of the diaphragm of the thermal expansion valve are respectively connected to the corresponding temperature sensing package and the corresponding pressure balance pipe.

[0022] In some of these embodiments, the refrigeration system further includes a controller;

[0023] The first throttle valve is an electronic expansion valve, and the first throttle valve is electrically connected to the controller; and / or

[0024] The second throttle valve is an electronic expansion valve, and the first detection device and the second detection device are both electrically connected to the second throttle valve through the controller.

[0025] In some embodiments, the first refrigeration main circuit further includes a first stop valve and a third pipeline, the third pipeline is connected between the output end of the first throttle valve and a diversion point, the diversion point is located at the connection between the first refrigeration main circuit and the input end of the refrigeration branch circuit, the first stop valve is arranged on the third pipeline, and is used to control the on-off of the third pipeline; and / or

[0026] The first refrigeration main circuit also includes a second stop valve and a fourth pipeline. The fourth pipeline is connected between the confluence point and the input end of the first compressor. The second stop valve is arranged on the fourth pipeline and is used to control the opening and closing of the fourth pipeline.

[0027] In some embodiments, 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 main 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;

[0028] The first condenser of the first refrigeration module and the evaporator of the second refrigeration module of the lowest temperature level are integrated into one to form a second evaporative condenser.

[0029] In the above refrigeration system, the first detection device can obtain the evaporation temperature of the heat exchanger by detecting the temperature at the first position. According to the evaporation temperature of the heat exchanger of the refrigeration branch, the outlet superheat of the heat exchanger of the refrigeration branch (i.e., the superheat of the refrigerant flowing through the outlet of the heat exchanger of the refrigeration branch) can be obtained. The second detection device can obtain the saturation temperature of the refrigeration system under the current refrigerant flow rate by detecting the temperature or pressure at the second position, and the superheat threshold of the heat exchanger of the refrigeration branch can be obtained according to the saturation temperature. Since the superheat threshold of the heat exchanger of each refrigeration branch is obtained based on a unified saturation temperature, the superheat threshold of the heat exchanger of each refrigeration branch is the same. According to the superheat threshold and the corresponding outlet superheat of each refrigeration branch, each refrigeration branch adjusts the opening of the first throttle valve corresponding to each refrigeration branch, so that the outlet superheat of the heat exchanger of each refrigeration branch is finally controlled within a certain deviation range, and the outlet superheat of the heat exchanger of each refrigeration branch tends to the superheat threshold. In this way, the unreasonable distribution of the 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. In addition, by designing the first throttle valve, the first throttle valve can adjust the refrigerant flow of the refrigeration system, that is, when the opening of the first throttle valve changes, the refrigerant flow in the first refrigeration module also changes accordingly. When the refrigerant flow of the refrigeration system changes, the cooling capacity of the refrigeration system also changes. In this way, the cooling capacity of each refrigeration branch changes to perform more extensive temperature control on electronic components. In this way, the refrigeration system can adaptively adjust the refrigerant flow according to the heating efficiency of the electronic components, thereby realizing adaptive adjustment of the cooling capacity to match and adapt to the heating efficiency of the electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a refrigeration system when the temperature sensing package provided in one embodiment of the present application forms a first detection device and a temperature detection element;

[0031] Figure 2 A schematic diagram of a refrigeration system when the first detection device provided in another embodiment of the present application is a temperature sensing package and the second detection device includes at least two pressure balance pipes.

[0032] Description of reference numerals:

[0033] 1. Refrigeration system;

[0034] 10. First refrigeration module; 20. Second refrigeration module;

[0035] 11. First refrigeration main circuit; 111. First compressor; 112. First condenser; 113. First throttle valve; 114. First stop valve; 115. Third pipeline; 116. Second stop valve; 117. Fourth pipeline; 118. Dispensing head; 12. Refrigeration branch circuit; 121. Second throttle valve; 122. Heat exchanger; 123. First pipeline; 124. Second pipeline; 13. Temperature sensing package; 14. Pressure balance pipe;

[0036] 21. Second refrigeration main circuit; 211. Second compressor; 212. Second condenser; 213. Third throttle valve; 24. Evaporator;

[0037] A. Confluence point; B. Divergence 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 should not 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 are not intended to be the only implementation method.

[0044] Please also read Figure 1 and Figure 2 In one embodiment of the present application, a refrigeration system 1 is provided. The refrigeration system 1 cooperates with a heating system to control the temperature of electronic components. As an example, the electronic components may be chips, diodes, resistors, etc., and the specific types of electronic components are not limited here.

[0045] The refrigeration system 1 includes a first refrigeration module 10, which includes a first refrigeration main circuit 11 and at least two refrigeration branches 12. The refrigeration branches 12 are branches of the first refrigeration main circuit 11, and the input and output ends of each refrigeration branch 12 are connected to the first refrigeration main circuit 11.

[0046] The first refrigeration main circuit 11 includes a first compressor 111, a first condenser 112 and a first throttle valve 113 which are connected in sequence. Specifically, the output end of the first compressor 111 (i.e., the outlet of the first compressor 111) is connected to the input end of the first condenser 112 (i.e., the inlet of the first condenser 112), and the output end of the first condenser 112 (i.e., the outlet of the first condenser 112) is connected to the input end of the first throttle valve 113 (i.e., the inlet of the first throttle valve 113).

[0047] Each refrigeration branch 12 includes a second throttle valve 121 and a heat exchanger 122. The output end of the first throttle valve 113 (i.e., the outlet of the first throttle valve 113) is connected to the input end of the second throttle valve 121 (i.e., the inlet of the second throttle valve 121), the output end of the second throttle valve 121 (i.e., the outlet of the second throttle valve 121) is connected to the input end of the heat exchanger 122 (i.e., the inlet of the heat exchanger 122), and the output end of the heat exchanger 122 (i.e., the outlet of the heat exchanger 122) is connected to the input end of the first compressor 111 (i.e., the inlet of the first compressor 111). In this way, the first compressor 111, the first condenser 112, the first throttle valve 113, the second throttle valve 121 of each refrigeration branch 12, and the heat exchanger 122 together form a refrigeration circuit, that is, the number of refrigeration branches 12 is equal to the number of refrigeration circuits and corresponds one to one, and each refrigeration branch 12 is constructed to form a part of the corresponding refrigeration circuit.

[0048] In actual operation, the first compressor 111 inhales the high-temperature, low-pressure refrigerant gas output from the output end of the heat exchanger 122, and compresses the refrigerant gas into a high-temperature, high-pressure refrigerant gas, which is then discharged from the output end of the first compressor 111 to the first condenser 112. When the refrigerant gas passes through the first condenser 112, it is condensed into a medium-temperature, high-pressure refrigerant liquid by the first condenser 112, and is expanded and reduced in pressure to a low-temperature, low-pressure refrigerant liquid through the first throttle valve 113, and then divided into multiple streams and input into each refrigeration branch 12, and flows through the second throttle valve 121 and the heat exchanger 122 of each refrigeration branch 12. When the low-temperature, low-pressure refrigerant liquid flows through the heat exchanger 122, the low-temperature, low-pressure refrigerant liquid exchanges heat with the electronic components to adjust the temperature of the electronic components. The high-temperature, low-pressure refrigerant gas formed after the heat exchange returns to the first compressor 111 from the output end of the heat exchanger 122, and the cycle repeats.

[0049] The first refrigeration module 10 further includes at least two first detection devices, each of which corresponds to a refrigeration branch 12 in a one-to-one manner, and is used to detect the temperature of the refrigerant at the first position of the corresponding refrigeration branch 12, the first position being located between the output end of the heat exchanger 122 and the confluence point A, and the confluence point A being located at the connection between the output end of the refrigeration branch 12 and the first refrigeration main circuit 11. That is, the number of the first detection devices is equal to the number of the refrigeration branches 12 and corresponds in a one-to-one manner, and each first detection device is used to detect the temperature of the refrigerant at the first position of the refrigeration branch 12 corresponding thereto.

[0050] The first refrigeration module 10 also includes a second detection device, which is used to detect the temperature or pressure of the refrigerant at a second position in the first refrigeration module 10, and the second position is located between the output end of the first throttle valve 113 and the input end of the second throttle valve 121 of at least one refrigeration branch 12.

[0051] For example, there is one second position, and it is located between the output end of the first throttle valve 113 on the first refrigeration main circuit 11 and the diversion point B, and the diversion point B is located at the connection between the first refrigeration main circuit 11 and the input end of the refrigeration branch 12. In this embodiment, the second detection device includes a detection component, and is used to detect the temperature or pressure of the second position. Alternatively, there are at least two second positions, and they correspond to the refrigeration branches 12 one by one. Each second position is located between the diversion point B on the corresponding refrigeration branch 12 and the input end of the second throttle valve 121. In this embodiment, the second detection device includes at least two detection components, and the detection components correspond to the refrigeration branches 12 one by one. Each detection component is used to detect the temperature or pressure of the second position on the corresponding refrigeration branch 12. For another example, there is one second position, and it is located between the output end of the first throttle valve 113 on the first refrigeration main circuit 11 and the diversion point B. In this embodiment, the second detection device includes at least two detection components, and the detection components correspond to the refrigeration branches 12 one by one. All detection components are used to detect the temperature or pressure of the same second position.

[0052] The detection component may be a temperature detection element or a pressure balance tube 14 .

[0053] Since the temperature of the refrigerant flowing through the output end of the first throttle valve 113 to the input end of the second throttle valve 121 of each refrigeration branch 12 is basically equal, and the pressure of the refrigerant flowing through the output end of the first throttle valve 113 to the input end of the second throttle valve 121 of each refrigeration branch 12 is also basically equal, therefore, in an embodiment where the second detection device includes at least two detection components, when the detection component is a temperature detection component, the temperatures detected by each detection component are basically equal, and when the detection component is a pressure balance pipe 14, the pressures detected by each detection component are also basically equal.

[0054] The second throttle valve 121 is connected to the first detection device and the second detection device corresponding thereto, that is, the second throttle valve 121 is connected to the first detection device and the second detection device corresponding to the refrigeration branch 12 where it is located. According to the specific form of the second throttle valve 121, the connection can be a mechanical connection or an electrical connection.

[0055] In the refrigeration system 1 provided in the embodiment of the present application, the first detection device can obtain the evaporation temperature of the heat exchanger 122 by detecting the temperature at the first position. According to the evaporation temperature of the heat exchanger 122 of the refrigeration branch 12, the outlet superheat of the heat exchanger 122 of the refrigeration branch 12 (that is, the superheat of the refrigerant flowing through the outlet of the heat exchanger 122 of the refrigeration branch 12) can be obtained. The second detection device can obtain the saturation temperature of the refrigeration system 1 at the current refrigerant flow rate by detecting the temperature or pressure at the second position, and the superheat threshold of the heat exchanger 122 of the refrigeration branch 12 can be obtained according to the saturation temperature. Since the superheat thresholds of the heat exchangers 122 of each refrigeration branch 12 are obtained based on a unified saturation temperature, the superheat thresholds of the heat exchangers 122 of each refrigeration branch 12 are the same. Each refrigeration branch 12 adjusts the opening of the first throttle valve 113 corresponding to each refrigeration branch 12 according to the superheat threshold and the corresponding outlet superheat, so that the outlet superheat of the heat exchanger 122 of each refrigeration branch 12 is finally controlled within a certain deviation range, and the outlet superheat of the heat exchanger 122 of each refrigeration branch 12 tends to the superheat threshold. In this way, the unreasonable distribution of refrigerant flow is avoided and the temperature uniformity of the heat exchanger 122 is ensured. At the same time, due to the reasonable distribution of refrigerant flow, each refrigeration branch 12 cooperates with the heating system to meet production needs.

[0056] Among them, it should be noted that the reasonable distribution of refrigerant flow does not mean that the refrigerant flow of each refrigeration branch 12 must be the same, and there may be different refrigerant flow rates of different refrigeration branches 12. Specifically, when the refrigerant flow of a certain refrigeration branch 12 is small and the refrigeration capacity is weak, the outlet superheat of the heat exchanger 122 will be too large and greater than the superheat threshold. This situation is likely to cause the heat dissipation effect of the electronic components corresponding to the refrigeration branch 12 to be poor, and the electronic components are at risk of high temperature burnout. Therefore, at this time, it is necessary to increase the opening of the first throttle valve 113 of the refrigeration branch 12, so that the refrigerant flow in the refrigeration branch 12 increases, the outlet superheat of the heat exchanger 122 decreases, and tends to the superheat threshold. When the refrigerant flow of a certain refrigeration branch 12 is large and the refrigeration capacity is strong, the outlet superheat of the heat exchanger 122 is small and less than the superheat threshold. This situation is likely to cause excessive heat dissipation of the electronic components corresponding to the refrigeration branch 12, and the electronic components are at risk of not being able to operate normally due to low temperature. Therefore, at this time, it is necessary to reduce the opening of the first throttle valve 113 of the refrigeration branch 12, so that the refrigerant flow in the refrigeration branch 12 is reduced, the outlet superheat of the heat exchanger 122 is increased, and tends to the superheat threshold, so as to control the outlet superheat of the heat exchanger 122 of each refrigeration branch 12 within a relatively stable range.

[0057] In addition, by designing the first throttle valve 113, the first throttle valve 113 can adjust the refrigerant flow of the refrigeration system 1, that is, when the opening of the first throttle valve 113 changes, the refrigerant flow in the first refrigeration module 10 also changes accordingly. When the refrigerant flow of the refrigeration system 1 changes, the refrigeration capacity of the refrigeration system 1 also changes, so that the refrigeration capacity of each refrigeration branch 12 changes to perform a wider range of temperature control on electronic components. In this way, the refrigeration system 1 can perform adaptive adjustment of the refrigerant flow according to the heating efficiency of the electronic components, thereby realizing adaptive adjustment of the cooling capacity to match and adapt to the heating efficiency of the electronic components.

[0058] For example, when the heating efficiency of the electronic component is high, the opening of the first throttle valve 113 increases, and when the heating efficiency of the electronic component is low, the opening of the first throttle valve 113 decreases.

[0059] It is worth mentioning that when the cooling capacity of the refrigeration system 1 changes, the temperature or pressure at the second position will also change, and the saturation temperature and superheat threshold of the refrigerant in the refrigeration system 1 will be adjusted accordingly. Furthermore, after the opening of the second throttle valve 121 of the refrigeration branch 12 is adjusted, the final outlet superheat of the heat exchanger 122 of the refrigeration branch 12 will also be adjusted. It can be understood that the final outlet superheat of the heat exchanger 122 is the superheat threshold.

[0060] Please refer again Figure 1In some optional embodiments, the second detection device includes at least two temperature detection members, each of which corresponds to a refrigeration branch 12. The temperature detection member is used to detect the temperature of the refrigerant at a second position of the corresponding refrigeration branch 12, and the second position is located between the branch point B and the input end of the second throttle valve 121. The second throttle valve 121 is connected to the corresponding first detection device and the corresponding temperature detection member.

[0061] The temperature detection component can detect the temperature of the refrigerant at the second position of the corresponding refrigeration branch 12 to obtain the outlet superheat of the heat exchanger 122 of the corresponding refrigeration branch 12. By comparing the superheat threshold with the outlet superheat of the heat exchanger 122, the opening of the second throttle valve 121 of the corresponding refrigeration branch 12 is adjusted to make the distribution of the refrigerant flow more reasonable.

[0062] In some embodiments, the temperature detection element and the first detection device may be two different components. In some embodiments, the temperature detection element and the first detection device may be the same component.

[0063] For example, in some optional embodiments, the second throttle valve 121 is a thermal expansion valve, and the first refrigeration module 10 includes at least two temperature sensing bags 13. The number of temperature sensing bags 13 and the refrigeration branches 12 are the same and correspond one to one. The temperature sensing bags 13 are constructed to form a first detection device and a temperature detection element, and are used to detect the temperature at the first position and the second position. That is, the temperature sensing bag 13 has the functions of the first detection device and the second detection device at the same time, and the temperature sensing bag 13 is mechanically connected to the thermal expansion valve.

[0064] Among them, in this embodiment, the thermal expansion valve is provided with a temperature-sensing bag 13 and is separately arranged from the temperature-sensing bag 13, and the two are connected through a capillary tube. The thermal expansion valve is connected between the diversion point B and the heat exchanger 122, and the temperature-sensing bag 13 is thermally coupled to the first position and the second position of the refrigeration branch 12 respectively. The temperature-sensing bag 13 is used to simultaneously detect the temperature of the first position and the second position. Therefore, in the refrigeration system 1, as long as the temperature-sensing bag 13 of the above-mentioned connection method is set, the temperature detection of the first position and the second position can be realized, and the refrigeration system 1 does not need to set up additional electronic control equipment to control the opening of the thermal expansion valve. The thermal expansion valve can automatically sense and automatically adjust, which simplifies the structure of the refrigeration system 1.

[0065] Take the first refrigeration module 10 including two refrigeration branches 12, namely the first refrigeration branch 12 and the second refrigeration branch 12, as an example. When the refrigerant of the two refrigeration branches 12 is unevenly distributed, it is assumed that the refrigeration flow of the first refrigeration branch 12 is large, and the flow of the refrigerant of the second refrigeration branch 12 is small. When the production temperature is the same, the outlet superheat of the heat exchanger 122 of the first refrigeration branch 12 will be smaller, and the outlet superheat of the heat exchanger 122 of the second refrigeration branch 12 will be larger. If the outlet superheat of the heat exchanger 122 of the first refrigeration branch 12 is less than the superheat threshold, 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 122 of the first refrigeration branch 12 will gradually increase until it reaches the superheat threshold. If the outlet superheat of the heat exchanger 122 of the second refrigeration branch 12 is greater than the superheat threshold, the opening of the thermal expansion valve will increase, the refrigerant flow rate of the circuit will increase, the heat exchange amount will increase, and the outlet superheat of the heat exchanger 122 of the second refrigeration branch 12 will gradually decrease until it reaches the superheat threshold. In this way, the refrigerants in the two refrigeration branches 12 reach the same superheat state.

[0066] In some optional embodiments, the refrigeration branch 12 includes a first pipeline 123 and a second pipeline 124, the first pipeline 123 is connected between the output end of the heat exchanger 122 and the confluence point A, and the second pipeline 124 is connected between the diversion point B and the input end of the second throttle valve 121. The first position is located at the outer wall of the first pipeline 123, and the second position is located at the outer wall of the second pipeline 124. The two temperature sensing surfaces of the temperature sensing package 13 are respectively attached to the outer wall of the first pipeline 123 and the outer wall of the second pipeline 124.

[0067] During operation, the refrigerant is split into each refrigeration branch 12 at the split point B, and flows through the second pipeline 124, the second throttle valve 121, the heat exchanger 122 and the first pipeline 123 in each refrigeration branch 12 in sequence, and meets at the confluence point A. Due to heat transfer, the temperature of the tube wall of the first pipeline 123 is close to or consistent with the temperature of the refrigerant flowing through the first pipeline 123, and similarly, the temperature of the tube wall of the second pipeline 124 is close to or consistent with the temperature of the refrigerant flowing through the second pipeline 124. In this way, the temperature sensing package 13 is located outside the first pipeline 123 and the second pipeline 124, and the two temperature sensing surfaces of the temperature sensing package 13 are respectively attached to the outer wall of the first pipeline 123 and the outer wall of the second pipeline 124. On the one hand, the temperature sensing package 13 can obtain the temperature of the first position and the second position at the same time with greater accuracy. In other words, the temperature signal transmitted from the temperature sensing package 13 to the thermal expansion valve is jointly determined by two temperature variables (the detection temperature of the first position and the detection temperature of the second position). In this way, it is possible to adaptively adjust the refrigerant flow of the multi-way heat exchanger 122 to make the refrigerant flow of the multi-way heat exchanger 122 the same, and it is also possible to control the superheat of the outlet of the controlled heat exchanger 122, thereby achieving the function of adjustable cooling capacity of the refrigeration system 1. On the other hand, it is also convenient to install the temperature sensing package 13, which is beneficial to improving the installation efficiency.

[0068] In some optional embodiments, the temperature sensing package 13 is clamped between the first pipeline 123 and the second pipeline 124. The clamping method can improve the tightness of the contact between the temperature sensing package 13 and the first pipeline 123 and the second pipeline 124, and the temperature sensing package 13 can accurately obtain the temperature of the first position and the second position, and make the layout of the refrigeration branch 12 more compact.

[0069] See also Figure 2 In some optional embodiments, the second detection device is a pressure detection device, and the second detection device is used to detect the pressure of the branch point B. The pressure detection device detects the pressure of the branch point B, which can be converted into the saturation temperature of the refrigeration system 1 under the current refrigerant flow rate. According to the saturation temperature, the superheat threshold of the heat exchanger 122 of each refrigeration branch 12 can be known, and then the opening adjustment of the second throttle valve 121 of each refrigeration branch 12 can be realized.

[0070] Further, in some optional embodiments, the second throttle valve 121 is a thermal expansion valve, and the first detection device is a temperature sensing package 13; the second detection device includes at least two pressure balancing pipes 14, each pressure balancing pipe 14 is connected to the diversion point B; the pressure balancing pipe 14 corresponds one-to-one to the refrigeration branch 12, and the two sides of the diaphragm of the thermal expansion valve are respectively connected to the corresponding temperature sensing package 13 and the corresponding pressure balancing pipe 14.

[0071] Among them, in this embodiment, the corresponding thermal expansion valve, temperature sensing package 13 and pressure balance tube 14 can be three separately arranged components, that is, an external balanced thermal expansion valve; or, the corresponding thermal expansion valve and temperature sensing package 13 are separately arranged, and the pressure sensing point (second detection device) is integrated inside the thermal expansion valve, that is, an internal balanced thermal expansion valve.

[0072] The temperature sensing package 13 is used to detect the temperature of the first position of the refrigeration branch 12, and the pressure balance pipe 14 is used to sense the pressure of the diversion point B to obtain the pressure of the second position. According to the temperature of the first position and the pressure of the second position, the thermal expansion valve can automatically adjust the opening. Therefore, the refrigeration system 1 does not need to set up additional electronic control equipment to control the opening of the thermal expansion valve. The thermal expansion valve can automatically sense and adjust, which simplifies the structure of the refrigeration system 1.

[0073] Please refer again Figure 1 and Figure 2 In some optional embodiments, the refrigeration system 1 also includes a controller; the first throttle valve 113 is an electronic expansion valve, and the first throttle valve 113 is electrically connected to the controller; the second throttle valve 121 is an electronic expansion valve, and the first detection device and the second detection device are both electrically connected to the second throttle valve 121 through the controller.

[0074] When the first throttle valve 113 is electrically connected to the controller, the controller controls the first throttle valve 113 to automatically adjust its opening according to the signal fed back from the operation of the electronic components, thereby controlling the cooling capacity of the refrigeration system 1 to achieve adaptive adjustment of the cooling capacity of the refrigeration system 1.

[0075] When the first detection device and the second detection device are both electrically connected to the second throttle valve 121 through the controller, the first detection device and the second detection device transmit the temperature signal and the pressure signal to the controller respectively, and the controller calculates the superheat threshold and the outlet superheat according to the temperature signal and the pressure signal, and determines the outlet superheat of the heat exchanger 122 of each refrigeration branch 12, thereby controlling the second throttle valve 121 of each refrigeration branch 12 to adjust the opening, so as to maintain the superheat of the heat exchanger 122 of each refrigeration branch 12 within a certain deviation range.

[0076] In some optional embodiments, the first refrigeration main circuit 11 also includes a first stop valve 114 and a third pipeline 115, the third pipeline 115 is connected between the output end of the first throttle valve 113 and the diversion point B, the diversion point B is located at the connection between the first refrigeration main circuit 11 and the input end of the refrigeration branch circuit 12, the first stop valve 114 is arranged on the third pipeline 115, and is used to control the on-off of the third pipeline 115; and / or, the first refrigeration main circuit 11 also includes a second stop valve 116 and a fourth pipeline 117, the fourth pipeline 117 is connected between the confluence point A and the input end of the first compressor 111, the second stop valve 116 is arranged on the fourth pipeline 117, and is used to control the on-off of the fourth pipeline 117.

[0077] The first stop valve 114 controls the on-off of the third pipeline 115 , and / or the second stop valve 116 controls the on-off of the fourth pipeline 117 , so as to control the on-off of the first refrigeration main circuit 11 and the refrigeration branch circuit 12 , so as to realize the refrigeration and suspension of the refrigeration system 1 .

[0078] In some optional embodiments, the first main refrigeration circuit 11 further includes a liquid separator 118 , which is disposed between the output end of the second throttle valve 121 and the diversion point B to separate the refrigerant into each refrigeration branch circuit 12 .

[0079] In some optional embodiments, the refrigeration system 1 also includes at least one level of second refrigeration module 20, each level of the second refrigeration module 20 includes a second compressor 211, a second condenser 212, a third throttle valve 213 and an evaporator 24 which are connected in sequence to form a second refrigeration main circuit 21, and the second condenser 212 and the evaporator 24 of two adjacent levels of the second refrigeration modules 20 are integrated into one to form a first evaporative condenser; the first condenser 112 of the first refrigeration module 10 and the evaporator 24 of the second refrigeration module 20 of the lowest temperature level are integrated into one to form a second evaporative condenser.

[0080] At this time, the refrigeration system 1 is at least a two-stage compression cascade refrigeration system 1. The second refrigeration module 20 may be one-stage or multi-stage, and the specific number of stages is not limited here.

[0081] Taking the refrigeration system 1 including the first-stage second refrigeration module 20 as an example, the refrigeration system 1 is a two-stage compression cascade refrigeration system 1. The second refrigeration module 20 is a high-temperature refrigeration module, and the first refrigeration module 10 is a low-temperature refrigeration module.

[0082] When the second refrigeration main circuit 21 is working, the second compressor 211 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 211 to the second condenser 212. When the refrigerant passes through the second condenser 212, it is condensed into a medium-temperature and high-pressure refrigerant liquid by the second condenser 212, and is expanded and decompressed into a low-temperature and low-pressure refrigerant liquid through the third throttle valve 213, 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 refrigerant liquid enters the second evaporative condenser, it performs heat exchange with the first refrigeration module 10. The refrigerant after heat exchange enters the second compressor 211 again from the output end of the second evaporative condenser, and the cycle repeats.

[0083] The refrigeration system 1 provided in the embodiment of the present application has the following beneficial effects:

[0084] 1. A first throttle valve 113 is provided on the first refrigeration main circuit 11. The first throttle valve 113 can adjust the refrigerant flow of the refrigeration system 1, that is, when the opening of the first throttle valve 113 changes, the refrigerant flow in the first refrigeration module 10 also changes accordingly. When the refrigerant flow of the refrigeration system 1 changes, the refrigeration capacity of the refrigeration system 1 also changes. In this way, the refrigeration capacity of each refrigeration branch circuit 12 changes to perform a wider range of temperature control on the electronic components. In this way, the refrigeration system 1 can adaptively adjust the refrigerant flow according to the heating efficiency of the electronic components to match and adapt to the heating efficiency of the electronic components.

[0085] 2. The temperature-sensing package 13 corresponds to the refrigeration branch 12 one by one. The same temperature-sensing package 13 is used to measure the temperature at the first position and the second position at the same time. The first position is located between the output end of the heat exchanger 122 on the refrigeration branch 12 corresponding to the temperature-sensing package 13 and the confluence point A, and the second position is located between the diversion point B and the input end of the second throttle valve 121 of the refrigeration branch 12 corresponding to the temperature-sensing package 13. According to the temperature at the first position and the second position, the opening degree of the second throttle valve 121 of the refrigeration branch 12 changes, avoiding the unreasonable distribution of the refrigerant flow and ensuring the temperature uniformity of the heat exchanger 122.

[0086] 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.

[0087] 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 (10), wherein the first refrigeration module (10) comprises: A first refrigeration main circuit (11) comprises a first compressor (111), a first condenser (112) and a first throttle valve (113) which are sequentially arranged and connected; at least two refrigeration branches (12), the refrigeration branches (12) comprising a second throttle valve (121) and a heat exchanger (122), the output end of the first throttle valve (113) being in communication with the input end of the second throttle valve (121), the output end of the second throttle valve (121) being in communication with the input end of the heat exchanger (122), and the output end of the heat exchanger (122) being in communication with the input end of the first compressor (111); at least two first detection devices, each of the first detection devices corresponding to the refrigeration branch (12) on a one-to-one basis, the first detection device being used to detect the temperature of the refrigerant at a first position of the corresponding refrigeration branch (12), the first position being located between the output end of the heat exchanger (122) and a confluence point (A), the confluence point (A) being located at the connection between the output end of the refrigeration branch (12) and the first refrigeration main circuit (11); and a second detection device, used for detecting the temperature or pressure of the refrigerant at a second position in the first refrigeration module (10), the second position being located between the output end of the first throttle valve (113) and the input end of the second throttle valve (121) of at least one of the refrigeration branches (12); The second throttle valve (121) is connected to the first detection device corresponding thereto, and the second detection device.

2. The refrigeration system according to claim 1, characterized in that: The second detection device comprises at least two temperature detection elements, the temperature detection elements corresponding to the refrigeration branches (12) one by one, the temperature detection elements being used to detect the temperature of the refrigerant at the second position of the corresponding refrigeration branch (12), the second position being located between the branch point (B) and the input end of the second throttle valve (121), the branch point (B) being located at the connection between the first refrigeration main circuit (11) and the input end of the refrigeration branch (12); The second throttle valve (121) is connected to the first detection device corresponding thereto, and to the temperature detection element corresponding thereto.

3. The refrigeration system according to claim 2, characterized in that: The second throttle valve (121) is a thermal expansion valve. The first refrigeration module (10) includes at least two temperature sensing bags (13). The temperature sensing bags (13) correspond to the refrigeration branches (12) one by one. The temperature sensing bags (13) are constructed to form the first detection device and the temperature detection element, and are used to detect the temperature of the first position and the second position. The temperature sensing bags (13) are mechanically connected to the thermal expansion valve.

4. The refrigeration system according to claim 3, characterized in that: The refrigeration branch (12) comprises a first pipeline (123) and a second pipeline (124), wherein the first pipeline (123) is connected between the output end of the heat exchanger (122) and the confluence point (A), and the second pipeline (124) is connected between the diversion point (B) and the input end of the second throttle valve (121); The first position is located on the outer wall of the first pipeline (123), the second position is located on the outer wall of the second pipeline (124), and the two temperature sensing surfaces of the temperature sensing package (13) are respectively attached to the outer wall of the first pipeline (123) and the outer wall of the second pipeline (124).

5. The refrigeration system according to claim 4, characterized in that: The temperature sensing package (13) is clamped between the first pipeline (123) and the second pipeline (124).

6. The refrigeration system according to claim 1, characterized in that: The second detection device is a pressure detection device, and the second detection device is used to detect the pressure of a branch point (B), and the branch point (B) is located at the connection between the first refrigeration main circuit (11) and the input end of the refrigeration branch circuit (12).

7. The refrigeration system according to claim 6, characterized in that: The second throttle valve (121) is a thermal expansion valve, and the first detection device is a temperature sensing package (13); The second detection device comprises at least two pressure balancing tubes (14), each of which is connected to the diversion point (B); the pressure balancing tubes (14) correspond one to one to the refrigeration branches (12), and the two sides of the diaphragm of the thermal expansion valve are respectively connected to the corresponding temperature sensing package (13) and the corresponding pressure balancing tube (14).

8. The refrigeration system according to claim 1, characterized in that: The refrigeration system also includes a controller; The first throttle valve (113) is an electronic expansion valve, and the first throttle valve (113) is electrically connected to the controller; and / or The second throttle valve (121) is an electronic expansion valve, and the first detection device and the second detection device are both electrically connected to the second throttle valve (121) via the controller.

9. The refrigeration system according to claim 1, characterized in that: The first refrigeration main circuit (11) further comprises a first stop valve (114) and a third pipeline (115); the third pipeline (115) is connected between the output end of the first throttle valve (113) and a branch point (B); the branch point (B) is located at the connection between the first refrigeration main circuit (11) and the input end of the refrigeration branch circuit (12); the first stop valve (114) is arranged on the third pipeline (115) and is used to control the on-off of the third pipeline (115); and / or The first refrigeration main circuit (11) further comprises a second stop valve (116) and a fourth pipeline (117); the fourth pipeline (117) is connected between the confluence point (A) and the input end of the first compressor (111); the second stop valve (116) is arranged on the fourth pipeline (117) and is used to control the on-off of the fourth pipeline (117).

10. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises at least one level of second refrigeration module (20), each level of the second refrigeration module (20) comprising a second compressor (211), a second condenser (212), a third throttle valve (213) and an evaporator (24) which are sequentially connected to form a second refrigeration main circuit (21), and the second condenser (212) and the evaporator (24) of two adjacent levels of the second refrigeration modules (20) are integrated into one body to form a first evaporative condenser; The first condenser (112) of the first refrigeration module (10) and the evaporator (24) of the second refrigeration module (20) of the lowest temperature level are integrated into one body to form a second evaporative condenser.

Images