Refrigerant sampling device and refrigeration cycle system

Abstract

The application discloses a refrigerant sampling device and a refrigeration cycle system, comprising: a sampling joint, comprising a first branch, a second branch and a third branch which are communicated with each other, the first branch and the second branch are used for connecting refrigerant pipelines; a sampling pipeline, connected with the third branch; a sampling switch, comprising a ball valve and a needle valve, both of which are arranged in the sampling pipeline and the ball valve is closer to the sampling joint than the needle valve; a vacuumizing joint, comprising a first end, a second end and a third end which are communicated with each other, the first end and the second end are connected with the sampling pipeline and are located on the side of the needle valve away from the ball valve; a vacuum pump, connected with the third end; and a containing piece, connected with the sampling pipeline. In this way, the safety and accuracy of sampling can be ensured, and the accuracy of sampling results is improved.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a refrigerant sampling device and a refrigeration cycle system. Background Technology

[0002] Currently, binary and multi-component mixed refrigerant throttling refrigeration technology is increasingly becoming the choice for cryogenic refrigeration systems. This technology still utilizes single-compressor refrigeration, and compared to conventional single-unit compression refrigeration systems, its system complexity is not significantly increased. However, compared to cascade refrigeration technology, it greatly reduces system complexity, leading to its widespread application. For mixed refrigerant throttling refrigeration systems, one key factor affecting system performance is the composition ratio of the mixed refrigerant. Generally, for a fixed mixed refrigerant throttling refrigeration system, a favorable mixed refrigerant composition ratio results in good refrigeration performance.

[0003] Because the various components of a mixed working fluid have different boiling points and other thermophysical properties, the refrigerant composition ratio in different components during the actual operation of the refrigeration system is not consistent with the refrigerant ratio charged before operation. Therefore, there is a large difference between the optimal charging concentration and the optimal operating concentration of the mixed working fluid. Thus, it is necessary to sample the actual operating concentration of the refrigerant to adjust the optimal charging concentration based on the optimal operating concentration, thereby ultimately improving the refrigeration performance of the refrigeration system. Summary of the Invention

[0004] This application provides a refrigerant sampling device and a refrigeration cycle system to solve at least some of the problems in the related art.

[0005] This application provides a refrigerant sampling device, including a sampling connector, which includes a first branch, a second branch and a third branch that are interconnected with each other, wherein the first branch and the second branch are used to connect to a refrigerant pipeline;

[0006] The sampling pipe is connected to the third branch;

[0007] A sampling switch includes a ball valve and a needle valve, both of which are located in the sampling pipeline and the ball valve is closer to the sampling connector than the needle valve.

[0008] A vacuum connector includes a first end, a second end, and a third end that are interconnected. The first end and the second end are connected to the sampling pipe and are located on the side of the needle valve away from the ball valve.

[0009] A vacuum pump is connected to the third end; and

[0010] The container is connected to the sampling pipe.

[0011] Optionally, the refrigerant sampling device further includes a vacuum pipe connected between the third end and the vacuum pump.

[0012] Optionally, the vacuuming pipeline is equipped with an on / off valve for controlling the opening and closing of the vacuuming pipeline.

[0013] Optionally, the refrigerant sampling device further includes a controller, which is connected to the ball valve, the needle valve and the vacuum pump, and is used to control the opening or closing of the ball valve and the needle valve and to control the start and stop of the vacuum pump.

[0014] Optionally, the sampling pipe is a metal pipe, and the third branch, the ball valve, the needle valve, the first end, and the second end are all welded to the metal pipe.

[0015] Optionally, the sampling conduit includes a first conduit, a second conduit, a third conduit, and a fourth conduit. The two ends of the first conduit are respectively connected to the third branch and one end of the ball valve. The two ends of the second conduit are respectively connected to the other end of the ball valve and one end of the needle valve. The two ends of the third conduit are respectively connected to the other end of the needle valve and the first end. The two ends of the fourth conduit are respectively connected to the second end and the receiving member.

[0016] Optionally, the welding length between the first pipe and the third branch is a first length, the welding length between the first pipe and one end of the ball valve is a second length, and the length of the first pipe is not greater than three times the sum of the first length and the second length; and / or

[0017] The weld length between the second pipe and the other end of the ball valve is a third length, and the weld length between the second pipe and one end of the needle valve is a fourth length. The length of the second pipe is not greater than three times the sum of the third length and the fourth length; and / or

[0018] The welding length between the third pipe and the other end of the needle valve is a fifth length, the welding length between the third pipe and the first end is a sixth length, and the length of the third pipe is no greater than three times the sum of the fifth length and the sixth length; and / or

[0019] The welding length between the fourth pipe and the second end is the sixth length, and the length of the fourth pipe is no more than three times the sixth length.

[0020] Optionally, a connecting tube is also included, which is connected between the sampling pipe and the receiving member, and the connecting tube is a flexible tube.

[0021] Optionally, the connecting pipe and the sampling pipe are connected by an interference fit, and the receiving part is provided with an air inlet pipe, and the connecting pipe and the air inlet pipe are connected by an interference fit.

[0022] Another aspect of this application provides a refrigeration cycle system, including a condenser, an evaporator, a throttle valve, a compressor, a refrigerant pipeline, and a refrigerant sampling device, wherein the refrigerant pipeline is connected between the condenser, the evaporator, the throttle valve, and the compressor, and the refrigerant sampling device is connected to the refrigerant pipeline.

[0023] The refrigerant sampling device and refrigeration cycle system provided in this application include a sampling connector, a sampling pipe, a sampling switch, a vacuum connector, a vacuum pump, and a receiving component. By setting up a sampling connector, and connecting its first and second branches to the refrigerant pipe, and the sampling pipe to its third branch, the refrigerant in the refrigerant pipe can be directed to the sampling pipe. By setting up a sampling switch, including a ball valve and a needle valve, both located in the sampling pipe with the ball valve closer to the sampling connector than the needle valve, the pressure resistance of the ball valve and the opening control capability of the needle valve can be utilized to improve the safety and controllability of the sampling. By setting up a vacuum connector and a vacuum pump, the sampling pipe can be evacuated before sampling, preventing other gases in the sampling pipe from mixing in and affecting the purity of the sampled gas.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 This is a schematic diagram of the structure of a refrigeration cycle system in related technologies;

[0027] Figure 2 This is a schematic diagram of a refrigeration cycle system structure according to one embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the structure of a refrigeration cycle system according to another embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the refrigerant sampling device according to one embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the refrigerant sampling device according to another embodiment of this application.

[0031] Reference numerals: Refrigeration cycle system 1, compressor 11, condenser 12, evaporator 13, throttle 14, refrigerant pipeline 15, refrigerant sampling device 2, sampling connector 21, first branch 211, second branch 212, third branch 213, sampling pipeline 22, ball valve 231, needle valve 232, vacuum connector 24, first end 241, second end 242, third end 243, vacuum pump 25, housing 26, vacuum pipeline 27, on / off valve 271, connecting pipe 28. Detailed Implementation

[0032] This application provides a refrigerant sampling device and a refrigeration cycle system. The refrigerant sampling device and refrigeration cycle system of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0033] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a refrigeration cycle system in the related technology. The refrigeration cycle system includes a condenser 12, an evaporator 13, a throttle valve 14, a compressor 11, and a refrigerant pipeline 15. The refrigerant pipeline 15 is connected between the condenser 12, the evaporator 13, the throttle valve 14, and the compressor 11.

[0034] During operation of the refrigeration equipment, the compressor 11 outputs high-temperature, high-pressure gaseous refrigerant to the condenser 12, where it condenses into medium-temperature, high-pressure refrigerant. This medium-temperature, high-pressure refrigerant then undergoes expansion and throttling by the expansion valve 14, further reducing its pressure and temperature. The resulting low-temperature, low-pressure liquid refrigerant flows from the expansion valve 14 to the evaporator 13. The low-temperature, low-pressure liquid refrigerant evaporates into gaseous refrigerant within the evaporator 13. Since at least a portion of the evaporator 13 is located inside the refrigeration equipment, the refrigerant absorbs a significant amount of heat from within the equipment during evaporation, thereby lowering the internal temperature and achieving the refrigeration purpose.

[0035] exist Figure 1 In the refrigerant pipeline 15, the refrigerant can be a single-component refrigerant or a mixed-component refrigerant. When the refrigerant is a mixed-component refrigerant, due to the different boiling points and other thermophysical properties of its constituent elements, the refrigerant composition ratio in different components during actual operation of the refrigeration system is inconsistent with the refrigerant ratio charged before operation. Therefore, there is a significant difference between the optimal charging concentration and the optimal operating concentration of the mixed-component refrigerant.

[0036] In order to further obtain the actual operating concentration distribution of refrigerant in different components of the mixed working fluid system, and to optimize the design of each component of the refrigeration system according to the distribution law, adjust the charging concentration according to the good operating concentration, and ultimately improve the refrigeration performance of the refrigeration system, it is necessary to take a small amount of refrigerant sample from the refrigeration system for concentration analysis, so as to adjust the charging concentration according to the good operating concentration and ultimately improve the refrigeration performance of the refrigeration system.

[0037] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a refrigeration cycle system 1 according to an embodiment of this application. Figure 2 In the illustrated embodiment, the refrigeration cycle system 1 includes a condenser 12, an evaporator 13, a throttle valve 14, a compressor 11, a refrigerant pipeline 15, and a refrigerant sampling device 2. The refrigerant pipeline 15 is connected between the condenser 12, the evaporator 13, the throttle valve 14, and the compressor 11, and the refrigerant sampling device 2 is connected to the refrigerant pipeline 15. By providing the refrigerant sampling device 2, the refrigerant in the refrigerant pipeline 15 can be sampled during the operation of the refrigeration equipment without affecting the operation of the refrigeration equipment.

[0038] exist Figure 2 In the illustrated embodiment, the refrigerant sampling device 2 is connected to the refrigerant pipeline 15 between the compressor 11 and the condenser 12, and is used to sample the high-temperature, high-pressure gaseous refrigerant output from the compressor 11. Because the compressor 11 outputs a high-temperature, high-pressure gaseous refrigerant with relatively high pressure, the refrigerant sampling device 2 can sample the gas smoothly without encountering problems due to low pressure preventing it from exiting. Furthermore, sampling from the refrigerant pipeline 15 between the compressor 11 and the condenser 12 avoids carrying away the lubricating oil inside the compressor 11.

[0039] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a refrigeration cycle system according to another embodiment of this application. Figure 3 The illustrated embodiments and Figure 2 The illustrated embodiments are essentially the same. The difference lies in that... Figure 3In the illustrated embodiment, two refrigerant sampling devices 2 are used. One refrigerant sampling device 2 is connected to the refrigerant pipeline 15 between the compressor 11 and the condenser 12, and is used to sample the high-temperature, high-pressure gaseous refrigerant output from the compressor 11. The other refrigerant sampling device 2 is connected to the refrigerant pipeline 15 between the evaporator 13 and the compressor 11, and is used to sample the gaseous refrigerant entering the compressor 11. Thus, by using two refrigerant sampling devices 2 to sample the refrigerant gas entering and exiting the compressor 11 respectively, it is possible to determine whether there is a difference in refrigerant concentration between the refrigerant gas entering and exiting the compressor 11.

[0040] In some other embodiments, there are two refrigerant sampling devices 2 on the refrigerant pipeline 15 between the compressor 11 and the condenser 12. In this way, the refrigerant gas in the same part of the refrigerant pipeline 15 can be sampled simultaneously by two refrigerant sampling devices 2, and the refrigerant gas sampled by the two refrigerant sampling devices 2 can be analyzed. The analysis results of the refrigerant gas sampled by the two refrigerant sampling devices 2 can be compared to improve the reliability of sampling and sampling detection.

[0041] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the refrigerant sampling device 2 shown in one embodiment of this application. Figure 4 In the embodiment shown, the refrigerant sampling device 2 includes a sampling connector 21, a sampling pipe 22, a sampling switch, a vacuum connector 24, a vacuum pump 25, and a container 26.

[0042] The sampling connector 21 includes three interconnected branches: a first branch 211, a second branch 212, and a third branch 213. The first and second branches 211 and 212 connect to the refrigerant pipeline 15, and the sampling pipeline 22 connects to the third branch 213. By setting up the sampling connector 21 and connecting its first and second branches 211 to the refrigerant pipeline 15, and its sampling pipeline 22 to the third branch 213, a portion of the refrigerant in the refrigerant pipeline 15 can be directed to the sampling pipeline 22 without affecting the flow of the refrigerant pipeline 15 itself. The remaining refrigerant can still pass through the refrigeration pipeline sequentially through the compressor 11, condenser 12, expansion valve 14, and evaporator 13 without affecting the normal operation of the refrigeration unit.

[0043] The sampling switch includes a ball valve 231 and a needle valve 232. Both ball valve 231 and needle valve 232 are located in the sampling pipeline 22, with ball valve 231 closer to the sampling connector than needle valve 232. By configuring the sampling switch, and ensuring that it includes both ball valve 231 and needle valve 232, with ball valve 231 closer to the sampling connector than needle valve 232, the refrigerant entering the sampling pipeline 22 first passes through ball valve 231 and then through needle valve 232. Ball valve 231 controls the opening and closing of the sampling pipeline 22, while needle valve 232 controls the sampling pressure and flow rate, ensuring safe, reliable, and controllable sampling. Thus, the pressure resistance of ball valve 231 and the opening control capability of needle valve 232 can be utilized to improve the safety and controllability of sampling.

[0044] The vacuum connector 24 includes a first end 241, a second end 242, and a third end 243 that are interconnected. The first end 241 and the second end 242 are connected to the sampling pipe 22 and are located on the side of the needle valve 232 away from the ball valve 231. The vacuum pump 25 is connected to the third end 243. The container 26 is connected to the sampling pipe 22. By providing the vacuum connector and the vacuum pump 25, the sampling pipe 22 can be evacuated before sampling to prevent other gases in the sampling pipe 22 from mixing in and affecting the purity of the sampled gas, and to allow pure gas to be introduced into the container 26.

[0045] exist Figure 4 In the illustrated embodiment, the refrigerant sampling device 2 further includes a vacuum pipe 27 connected between the third end 243 and the vacuum pump 25. Thus, the vacuum pump 25 is connected to the sampling pipe 22 via the vacuum pipe 27, and other gases in the sampling pipe 22 are removed through the vacuum pipe 27 to avoid affecting the accuracy of the sampling results.

[0046] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the refrigerant sampling device 2 according to another embodiment of this application. Figure 5 In the illustrated embodiment, the vacuuming pipe 27 is equipped with an on / off valve 271 to control the opening and closing of the vacuuming pipe 27. By setting the on / off valve 271, the opening and closing of the vacuuming pipe 27 can be controlled. Thus, before sampling, the on / off valve 271 can be opened, and the vacuum pump 25 can remove other gases from the sampling pipe 22. After vacuuming, the on / off valve 271 is closed, and then the ball valve 231 and needle valve 232 are opened. This prevents refrigerant gas entering the sampling pipe 22 from leaking through the vacuuming pipe 27, which not only saves refrigerant gas and reduces refrigerant loss during sampling, but also protects the environment.

[0047] In some embodiments, the refrigerator sampling device further includes a controller, where ball valve 231 is an electrically controlled ball valve 231, needle valve 232 is an electrically controlled needle valve 232, and vacuum pump 25 is an electrically controlled vacuum pump 25. The controller is connected to ball valve 231, needle valve 232, and vacuum pump 25 respectively, and is used to control the opening or closing of ball valve 231 and needle valve 232, as well as the start and stop of vacuum pump 25. This improves the automation level of sampling and saves labor. Furthermore, the controller allows for precise control of the opening and closing of ball valve 231 and needle valve 232, and the degree of opening, improving the safety and controllability of sampling. In other embodiments, the vacuum pipe 27 also includes a vacuum gauge, which is connected to the controller, and the controller is connected to the vacuum gauge. This ensures that the vacuum level in the sampling pipe 22 meets the requirements, improving the accuracy of the sampling results.

[0048] exist Figure 4 and Figure 5 In the illustrated embodiment, the sampling pipe 22 is a metal pipe, typically made of corrosion-resistant materials such as stainless steel, carbon steel, or copper; this application does not limit this type. The third branch 213, ball valve 231, needle valve 232, first end 241, and second end 242 are all welded to the metal pipe. Thus, the third branch 213, ball valve 231, needle valve 232, first end 241, and second end 242 are all connected to the metal pipe by welding. This welded connection effectively prevents leakage and exhibits stability under high pressure or high temperature environments, ensuring the connection's strength and sealing.

[0049] The sampling pipeline 22 includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The two ends of the first pipeline are respectively connected to the third branch 213 and one end of the ball valve 231. The two ends of the second pipeline are respectively connected to the other end of the ball valve 231 and one end of the needle valve 232. The two ends of the third pipeline are respectively connected to the other end of the needle valve 232 and the first end 241. The two ends of the fourth pipeline are respectively connected to the second end 242 and the receiving member 26.

[0050] By using a combination of four pipes to form the sampling pipe 22, the connection between the sampling pipe 22 as a whole and the sampling connector 21, ball valve 231, needle valve 232, vacuum connector 24 and housing 26 is facilitated, thereby improving the flexibility of the refrigeration sampling device.

[0051] In some embodiments, the welding length between the first pipe and the third branch 213 is the first length, and the welding length between the first pipe and one end of the ball valve 231 is the second length. The length of the first pipe is no more than three times the sum of the first length and the second length. This ensures that the length of the portion of the first pipe not welded to other components is not excessive, preventing the overall length of the first pipe from becoming too long. This avoids the entire sampling pipe 22 from becoming too long, preventing excessive refrigerant input during sampling, which would otherwise lead to refrigerant consumption and affect the operation of the refrigeration cycle system 1.

[0052] The welding length between the second pipe and the other end of the ball valve 231 is the third length, and the welding length between the second pipe and one end of the needle valve 232 is the fourth length. The length of the second pipe is no more than three times the sum of the third and fourth lengths. In this way, the length of the second pipe will not be too long, thereby avoiding the entire sampling pipe 22 from being too long.

[0053] The welding length between the third pipe and the other end of the needle valve 232 is the fifth length, and the welding length between the third pipe and the first end 241 is the sixth length. The length of the third pipe is no more than three times the sum of the fifth and sixth lengths. In this way, the length of the third pipe will not be too long, thereby avoiding the entire sampling pipe 22 from being too long.

[0054] The welding length between the fourth pipe and the second end 242 is the sixth length, and the length of the fourth pipe is no more than three times the sixth length. In this way, the length of the fourth pipe will not be too long, thereby avoiding the entire sampling pipe 22 from being too long.

[0055] exist Figure 5 In the illustrated embodiment, the refrigerant sampling device 2 further includes a connecting pipe 28, which connects the sampling pipe 22 and the receiving component 26, facilitating the connection between the sampling pipe 22 and the receiving component 26. The connecting pipe 28 is a flexible hose. The hose has good flexibility, allowing for easy adjustment of the position and orientation of the receiving component 26, and facilitating the connection between the receiving component 26 and the sampling pipe 22. In some embodiments, the hose is made of silicone, a soft and stable material with certain heat and corrosion resistance. This not only facilitates the connection between the sampling pipe 22 and the receiving component 26 but also preserves the heat resistance and corrosion resistance of the refrigerant sampling device 2.

[0056] In some embodiments, the connecting pipe 28 and the sampling pipe 22 are connected by an interference fit, so that the connection between the connecting pipe 28 and the sampling pipe 22 is tight, preventing refrigerant gas leakage or other gases from entering the sampling pipe 22.

[0057] In some embodiments, the container 26 is a sampling bag, and the amount of refrigerant gas entering the sampling bag can be determined by the state of the sampling bag. The container 26 has an inlet pipe, and the connecting pipe 28 is interference-fitted to the inlet pipe. This ensures a tight connection between the container 26 and the connecting pipe 28, preventing refrigerant gas leakage or other gases from entering the container 26. In some embodiments, a valve is provided on the inlet pipe, which can control the opening and closing of the connection between the sampling bag and the connecting pipe 28. This allows the valve to be opened during vacuuming to evacuate the sampling bag, and the valve to be closed after sampling to seal the sampling bag.

[0058] In use, the refrigerant sampling device 2 provided in this embodiment first opens the needle valve 232 and the on / off valve 271, and turns on the vacuum pump 25. The vacuum pump 25 evacuates the sampling pipe 22 and the container 26 between the ball valve 231 and the container 26. This prevents other gases from mixing into the refrigerant gas. Then, the on / off valve 271, needle valve 232, and vacuum pump 25 are closed, ending the vacuuming process. Next, the pressure-resistant ball valve 231 is opened to a suitable degree, and the opening of the needle valve 232 is slowly adjusted, allowing the refrigerant gas to slowly enter the container 26 from the refrigerant pipe 15. The amount of gas entering the container 26 is then determined. After sufficient sampling, the container 26 is sealed, placing it in a sealed state. The needle valve 232 and ball valve 231 are then closed, ending the sampling process. The container 26 is then removed, and the sampled refrigerant gas is analyzed.

[0059] The refrigerant sampling device 2 and refrigeration cycle system 1 provided in this application embodiment can simultaneously ensure safety during the sampling process, ensure that the sampling does not affect the operation of the system, reduce excessive refrigerant retention in the sampling pipeline, and remove impurities such as air from the sampling pipeline before sampling. Not only is the sampling process safe and controllable and the sampling results accurate, but it also does not affect the operation of the refrigeration cycle system 1.

[0060] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0061] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A refrigerant sampling device, characterized in that, include: The sampling connector includes a first branch, a second branch, and a third branch that are interconnected, wherein the first branch and the second branch are used to connect to a refrigerant pipeline; The sampling pipe is connected to the third branch; A sampling switch includes a ball valve and a needle valve, both of which are located in the sampling pipeline and the ball valve is closer to the sampling connector than the needle valve. A vacuum connector includes a first end, a second end, and a third end that are interconnected. The first end and the second end are connected to the sampling pipe and are located on the side of the needle valve away from the ball valve. A vacuum pump is connected to the third end; and The container is connected to the sampling pipe.

2. The refrigerant sampling device according to claim 1, characterized in that, The refrigerant sampling device also includes a vacuum pipe connected between the third end and the vacuum pump.

3. The refrigerant sampling device according to claim 2, characterized in that, The vacuuming pipeline is equipped with an on / off valve to control the opening and closing of the vacuuming pipeline.

4. The refrigerant sampling device according to claim 1, characterized in that, The refrigerant sampling device also includes a controller, which is connected to the ball valve, the needle valve and the vacuum pump, and is used to control the opening or closing of the ball valve and the needle valve and to control the start and stop of the vacuum pump.

5. The refrigerant sampling device according to claim 1, characterized in that, The sampling pipe is a metal pipe, and the third branch, the ball valve, the needle valve, the first end, and the second end are all welded to the metal pipe.

6. The refrigerant sampling device according to claim 5, characterized in that, The sampling pipeline includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The two ends of the first pipeline are respectively connected to the third branch and one end of the ball valve. The two ends of the second pipeline are respectively connected to the other end of the ball valve and one end of the needle valve. The two ends of the third pipeline are respectively connected to the other end of the needle valve and the first end. The two ends of the fourth pipeline are respectively connected to the second end and the receiving member.

7. The refrigerant sampling device according to claim 6, characterized in that, The welding length between the first pipe and the third branch is a first length, the welding length between the first pipe and one end of the ball valve is a second length, and the length of the first pipe is no greater than three times the sum of the first length and the second length; and / or The weld length between the second pipe and the other end of the ball valve is a third length, and the weld length between the second pipe and one end of the needle valve is a fourth length. The length of the second pipe is not greater than three times the sum of the third length and the fourth length; and / or The welding length between the third pipe and the other end of the needle valve is a fifth length, the welding length between the third pipe and the first end is a sixth length, and the length of the third pipe is no greater than three times the sum of the fifth length and the sixth length; and / or The welding length between the fourth pipe and the second end is the sixth length, and the length of the fourth pipe is no more than three times the sixth length.

8. The refrigerant sampling device according to claim 1, characterized in that, It also includes a connecting tube, which connects the sampling pipe and the receiving component, and the connecting tube is a flexible tube.

9. The refrigerant sampling device according to claim 8, characterized in that, The connecting pipe and the sampling pipe are connected by an interference fit, and the receiving part is provided with an air inlet pipe, and the connecting pipe and the air inlet pipe are connected by an interference fit.

10. A refrigeration cycle system, characterized in that, The device includes a condenser, an evaporator, a throttle valve, a compressor, the refrigerant piping, and a refrigerant sampling device as described in any one of claims 1-9, wherein the refrigerant piping is connected between the condenser, the evaporator, the throttle valve, and the compressor, and the refrigerant sampling device is connected to the refrigerant piping.

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