Hot and cold shock test tool and test method for welding-free connecting ring of household refrigerator refrigerating system pipeline

Abstract

The invention discloses a cold and hot shock test tool and test method for a welding-free connecting ring of a pipeline of a household refrigerator refrigeration system. A high-temperature test box provides a first temperature for a high-temperature oil tank; a low-temperature oil tank of the low-temperature test box provides a second temperature; a first welding-free connecting ring and a second welding-free connecting ring are communicated in the circulating pipeline; the first welding-free connecting ring is communicated with the high-temperature oil tank through a circulating pipeline, and the second welding-free connecting ring is communicated with the low-temperature oil tank through the circulating pipeline; the driving part drives a medium in the low-temperature oil tank to flow through the first welding-free connecting ring to enter the high-temperature oil tank through the circulating pipeline, and the driving part drives a medium in the high-temperature oil tank to flow through the second welding-free connecting ring to enter the low-temperature oil tank through the circulating pipeline. According to the invention, a real use condition can be simulated to carry out a cold and hot impact test on the welding-free connecting ring, and the temperature impact of a refrigerant which comes from the interior and has a temperature difference with the external environment is simulated.

Description

Technical Field

[0001] This invention belongs to the field of testing tooling technology, specifically, it relates to a tooling and testing method for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator. Background Technology

[0002] As a replacement for traditional flame welding, weldless connection rings have been widely adopted due to their characteristics of not requiring high-temperature welding and not producing harmful gases and fumes. However, the diverse environmental and climatic conditions and varying operating conditions of refrigeration system applications have placed new demands on the safety and reliability of weldless connection rings during use.

[0003] Currently, when the home appliance industry conducts thermal shock tests on weldless refrigerant connections for pipes, the sample pipe is placed in a high-temperature environment for a period of time, then transferred to a low-temperature environment for a period of time, and this process is repeated. The sample is subjected to external temperature shock. In actual refrigerator operation, the weldless refrigerant connection is subjected to temperature shock from the internal refrigerant, which has a temperature difference with the external environment.

[0004] Therefore, developing a testing fixture and method for thermal shock testing of weldless connection rings in the refrigeration system of household refrigerators, capable of simulating real-world operating conditions to conduct thermal shock tests on the weldless connection rings and simulating the temperature shock from the refrigerant inside the rings that has a temperature difference with the external environment, is an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a tooling and method for testing the thermal shock of weldless connection rings in the refrigeration system of a household refrigerator. This tooling can simulate real-world operating conditions to conduct thermal shock tests on the weldless connection rings, simulating the temperature shock from the refrigerant inside the rings that has a temperature difference with the external environment.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In one aspect, the present invention proposes a tooling for testing the thermal shock of weld-free connection rings in the refrigeration system piping of a household refrigerator, comprising: A high-temperature test chamber is provided with a high-temperature oil tank and a first weld-free connecting ring, wherein the high-temperature test chamber provides a first temperature to the high-temperature oil tank; A low-temperature test chamber is provided with a low-temperature oil tank and a second weld-free connecting ring. The low-temperature test chamber and the low-temperature oil tank provide a second temperature. A circulation pipeline is provided, in which a first solderless connecting ring and a second solderless connecting ring are connected; the first solderless connecting ring is connected to the high-temperature oil tank through the circulation pipeline, and the second solderless connecting ring is connected to the low-temperature oil tank through the circulation pipeline. Drive unit; The drive unit drives the medium in the low-temperature oil tank to flow through the circulation pipeline and through the first weld-free connecting ring into the high-temperature oil tank, and the drive unit drives the medium in the high-temperature oil tank to flow through the circulation pipeline and through the second weld-free connecting ring into the low-temperature oil tank.

[0007] In some embodiments of this application, the circulation pipeline includes a high-temperature oil outlet pipe, a low-temperature oil outlet pipe, a first weld-free connection ring pipeline, and a second weld-free connection ring pipeline; One end of the high-temperature oil outlet pipe and one end of the first weld-free connecting ring pipe are both connected to the high-temperature oil tank. One end of the low-temperature oil outlet pipe and one end of the second weld-free connecting ring pipe are both connected to the low-temperature oil tank. The other end of the high-temperature oil outlet pipe is connected to the other end of the first weldless connection ring pipe and the other end of the second weldless connection ring pipe through the driving part; the other end of the low-temperature oil outlet pipe is connected to the other end of the second weldless connection ring pipe and the other end of the first weldless connection ring pipe through the driving part.

[0008] In some embodiments of this application, the circulation pipeline further includes a high-temperature return oil pipe and a low-temperature return oil pipe; One end of the high-temperature return oil pipe is connected to the high-temperature oil tank, and the other end of the high-temperature return oil pipe is connected to one end of the second weldless connection ring pipeline; the medium in the high-temperature oil tank, under the driving state of the drive unit, flows through the high-temperature oil outlet pipe and the first weldless connection ring pipeline to the second weldless connection ring pipeline and the high-temperature return oil pipe, flows to the second weldless connection ring pipeline to test the second weldless connection ring, and the high-temperature return oil pipe is used to return oil to the high-temperature oil tank; One end of the low-temperature return oil pipe is connected to the low-temperature oil tank, and the other end of the low-temperature return oil pipe is connected to one end of the first weldless connection ring pipeline. The medium in the low-temperature oil tank, under the driving state of the drive unit, flows through the low-temperature oil outlet pipe and the second weldless connection ring pipeline to the first weldless connection ring pipeline and the high-temperature return oil pipe, and flows to the first weldless connection ring pipeline to test the first weldless connection ring. The low-temperature return oil pipe is used to return oil to the low-temperature oil tank.

[0009] In some embodiments of this application, the circulation pipeline includes: A high-temperature oil outlet valve is connected in the high-temperature oil outlet pipe to control the opening and closing of the high-temperature oil outlet pipe; And / or, a high-temperature return valve, which is connected in the high-temperature return pipe to control the on / off state of the high-temperature return pipe; And / or, a low-temperature oil outlet valve, which is connected in the low-temperature oil outlet pipe to control the opening and closing of the low-temperature oil outlet pipe; And / or, a cryogenic return valve, which is connected in the cryogenic return pipe to control the opening and closing of the cryogenic return pipe.

[0010] In some embodiments of this application, the drive unit includes a motor and a gear pump; The motor drives the high-temperature oil outlet pipe to discharge oil via the gear pump; or, the motor drives the low-temperature oil outlet pipe to discharge oil via the gear pump.

[0011] In some embodiments of this application, a high-temperature temperature measuring unit is provided inside the high-temperature oil tank; and a low-temperature temperature measuring unit is provided inside the low-temperature oil tank.

[0012] In some embodiments of this application, a control system is also included, which is electrically connected to the drive unit, the high-temperature oil outlet valve, the high-temperature oil return valve, the low-temperature oil outlet valve, the low-temperature oil return valve, the high-temperature temperature measuring unit, and the low-temperature temperature measuring unit.

[0013] In some embodiments of this application, the first temperature ranges from 85°C to 120°C; the second temperature ranges from -45°C to -30°C.

[0014] On the other hand, this application proposes a method for testing the thermal shock of weld-free connection rings in the refrigeration system piping of a household refrigerator, comprising: S1: Set the operating temperature of the high-temperature test chamber; Set the operating temperature of the low-temperature test chamber; S2: The control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber has reached the first temperature and the low-temperature test chamber has reached the second temperature; S3: The control system controls the high-temperature oil outlet valve to close, the low-temperature oil outlet valve to open, the high-temperature oil return valve to close, the low-temperature oil return valve to open, and the motor to rotate in the reverse direction for time T1. S4: After the motor rotates in the reverse direction for a time T1, the motor stops working, and the control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber has reached the first temperature and the low-temperature test chamber has reached the second temperature. S5: The control system controls the high-temperature oil outlet valve to open, the low-temperature oil outlet valve to close, the high-temperature oil return valve to open, the low-temperature oil return valve to close, and the motor to rotate forward for time T2. S6: After the motor rotates in the opposite direction for a time T2, repeat steps S2 to S5 for N tests.

[0015] In some embodiments of this application, the number of N trials is not less than 50.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: By setting up a high-temperature test chamber and a low-temperature test chamber, the high-temperature oil tank is kept at a first temperature and the low-temperature oil tank at a second temperature, respectively. A first weldless connecting ring is placed in the high-temperature test chamber, keeping it at a high temperature, while a second weldless connecting ring is placed in the low-temperature test chamber, keeping it at a low temperature. Both the first and second weldless connecting rings are connected to a circulation pipeline. The drive unit drives the medium in the low-temperature oil tank to flow through the circulation pipeline, passing through the first weldless connecting ring and entering the high-temperature oil tank. Similarly, the drive unit drives the medium in the high-temperature oil tank to flow through the circulation pipeline, passing through the second weldless connecting ring and entering the low-temperature oil tank. This results in the low-temperature medium flowing through the first weldless connecting ring and the high-temperature medium flowing through the second weldless connecting ring, thus achieving thermal shock to the first and second weldless connecting rings. This better simulates real-world operating conditions, and the test data can better guide actual production and use.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a thermal shock testing fixture for weld-free connecting rings in the refrigeration system of a household refrigerator, as proposed in this invention. Figure 2 yes Figure 1 A partial schematic diagram of point A in the middle; Figure 3 This is a schematic diagram of an embodiment of a thermal shock testing fixture for weld-free connecting rings in the refrigeration system of a household refrigerator, as proposed in this invention. Figure 4 yes Figure 3 A partial schematic diagram at point B in the middle; Figure 5 yes Figure 3 A partial schematic diagram at point C in the middle; In the picture, 100. High-temperature test chamber; 110. High-temperature fuel tank; 120. First weld-free connecting ring; 200. Low-temperature test chamber; 210. Low-temperature oil tank; 220. Second weld-free connecting ring; 310. High-temperature oil outlet pipe; 320. Low-temperature oil outlet pipe; 330. First weld-free connection ring pipeline; 340. Second weld-free connection ring pipeline; 350. High-temperature return oil pipe; 360° Cryogenic return oil pipe; 371. High-temperature oil outlet valve; 372. High-temperature oil return valve; 373. Low-temperature oil outlet valve; 374. Low-temperature oil return valve; 400. Drive unit; 410. Electric motor; 420. Gear pump. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0026] In some embodiments of this application, a thermal shock testing fixture for weldless connection rings in the refrigeration system of a household refrigerator is provided. This fixture is used to perform thermal shock tests on the weldless connection rings to simulate the thermal shock conditions experienced by the weldless connection rings in the refrigeration system of a household refrigerator due to internal temperature changes during use.

[0027] like Figure 1 , Figure 3 As shown, a fixture for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator includes a high-temperature test chamber 100, a low-temperature test chamber 200, a circulation pipeline, and a drive unit 400.

[0028] like Figure 4 As shown, the high-temperature test chamber 100 is equipped with a high-temperature oil tank 110 and a first weld-free connecting ring 120.

[0029] The high-temperature test chamber 100 is used to provide the first temperature to the high-temperature oil tank 110.

[0030] like Figure 5 As shown, the low-temperature test chamber 200 is equipped with a low-temperature oil tank 210 and a second weld-free connecting ring 220.

[0031] The low-temperature test chamber 200 is used to provide a second temperature to the low-temperature oil tank 210.

[0032] To simulate the actual tooling for the weldless connection ring of a household refrigerator pipe system, the first temperature range was designed to be 85℃ to 120℃; the second temperature range was designed to be -45℃ to -30℃.

[0033] Both the first weldless connecting ring 120 and the second weldless connecting ring 220 are connected in the circulation pipeline.

[0034] The first weldless connecting ring 120 is connected to the high-temperature oil tank 110 through a circulation pipeline.

[0035] The second weldless connecting ring 220 is connected to the cryogenic oil tank 210 through a circulation pipeline.

[0036] The drive unit 400 drives the medium in the low-temperature oil tank 210 to flow through the first weld-free connecting ring 120 into the high-temperature oil tank 110 via the circulation pipeline.

[0037] The drive unit 400 drives the medium in the high-temperature oil tank 110 to flow through the circulation pipeline and the second weld-free connecting ring 220 into the low-temperature oil tank 210.

[0038] The circulation pipeline includes a high-temperature oil outlet pipe 310, a low-temperature oil outlet pipe 320, a first weld-free connecting ring pipeline 330, and a second weld-free connecting ring pipeline 340.

[0039] One end of the high-temperature oil outlet pipe 310 and one end of the first weld-free connecting ring pipe 330 are connected to the high-temperature test chamber 100.

[0040] The other end of the high-temperature oil outlet pipe 310 and the other end of the first weldless connection ring pipe 330 are driven by the drive unit 400 and connected to the second weldless connection ring pipe 340. This allows the high-temperature medium in the high-temperature oil tank 110 to be output from the high-temperature oil tank 110 through the high-temperature oil outlet pipe 310 and the first weldless connection ring pipe 330 and flow into the second weldless connection ring pipe 340. Since the second weldless connection ring 220 is located in the low-temperature test chamber 200, the high-temperature medium flows into the second weldless connection ring 220 and causes thermal shock to the second weldless connection ring 220, thereby conducting a thermal shock test on the second weldless connection ring 220.

[0041] In order to reproduce the actual working conditions of the first weldless connecting ring 120 and the second weldless connecting ring 220 as much as possible, the diameters of the first weldless connecting ring pipeline 330 and the second weldless connecting ring pipeline 340 are both relatively small.

[0042] If the high-temperature oil tank 110 and the low-temperature oil tank 210 are only connected through the first weldless connection ring pipe 330 and the second weldless connection ring pipe 340, the flow rate will be small, or even jamming may occur, which may lead to damage to the drive unit 400.

[0043] However, in order to ensure that the drive unit 400 can drive the medium to circulate normally in the circulation pipeline, it is necessary to ensure that there is a certain flow rate in the circulation pipeline. Therefore, when outputting high-temperature oil through the high-temperature oil tank 110, the high-temperature oil is output through the high-temperature oil outlet pipe 310 and the first weldless connection ring pipe 330. At the same time as the high-temperature oil is injected into the second weldless connection ring pipe 340, since the diameter of the second weldless connection ring pipe 340 is small, the flow rate of the medium flowing through it is small in a certain period of time. In order to avoid damage to the drive unit 400, a high-temperature return oil pipe 350 is connected in parallel with the second weldless connection ring pipe 340. The drive unit 300 drives the high-temperature oil from the high-temperature oil outlet pipe 310 and the first weldless connection ring pipe 330 to flow through the second weldless connection ring pipe 340 to the low-temperature oil tank 210. At the same time, the remaining high-temperature medium flows back to the high-temperature oil tank 110 through the high-temperature return oil pipe 350.

[0044] The high-temperature return oil pipe 350 and the high-temperature outlet oil pipe 310 use pipes of the same diameter. This ensures that the total amount of medium flowing through the high-temperature outlet oil pipe 310 and the first weldless connection ring pipe 330 is the same as the total amount of medium flowing through the high-temperature return oil pipe 350 and the second weldless connection ring pipe 340. This ensures that the total amount of medium in the high-temperature oil tank 110 and the low-temperature oil tank 210 remains unchanged.

[0045] One end of the high-temperature return oil pipe 350 is connected to the high-temperature oil tank 110. The other end of the high-temperature return oil pipe 350 is connected to the second weld-free connection ring pipe 340.

[0046] Similarly, the circulation pipeline also includes a cryogenic return oil pipe 360. One end of the cryogenic return oil pipe 360 ​​is connected to the cryogenic oil tank 210, and the other end of the cryogenic return oil pipe 360 ​​is connected to the first weld-free connection ring pipeline 330.

[0047] The cryogenic oil outlet pipe 320 and the second weldless connection ring pipe 340 output the medium from the cryogenic oil tank 210. The drive unit 400 drives the medium to flow to the first weldless connection ring pipe 300 and the cryogenic return oil pipe 360. This achieves thermal shock to the first weldless connection ring 120. The cryogenic medium then flows back to the cryogenic oil tank 210 via the cryogenic return oil pipe 360.

[0048] In some embodiments of this application, the drive unit 400 includes a motor 410 and a gear pump 420. The motor 410 drives the gear pump 420.

[0049] Specifically, motor 410 can be a stepper motor. Gear pump 420 is mounted at the front end of the stepper motor.

[0050] The high-temperature test chamber 100 is used to provide the initial temperature to the high-temperature oil tank 110. To monitor the temperature inside the high-temperature test chamber 100 at all times, a high-temperature measuring unit is installed inside the high-temperature test chamber 100. The high-temperature measuring unit is used to measure the temperature inside the high-temperature test chamber 100.

[0051] Specifically, a temperature sensing probe can be used for the high-temperature measurement unit.

[0052] The low-temperature test chamber 200 is used to provide a second temperature to the low-temperature oil tank 210. To monitor the temperature inside the low-temperature test chamber 200 at all times, a low-temperature measuring unit is installed inside the low-temperature test chamber 200. The low-temperature measuring unit is used to measure the temperature inside the low-temperature test chamber 200.

[0053] In some embodiments of this application, a control system is also provided, which is electrically connected to the drive unit 400. The control system is capable of controlling the start and stop of the stepper motor, as well as the forward or reverse rotation of the stepper motor.

[0054] The circulation pipeline also includes a high-temperature oil outlet valve 371, a high-temperature oil return valve 372, a low-temperature oil outlet valve 373, and a low-temperature oil return valve 374.

[0055] The high-temperature oil outlet valve 371 is connected to the high-temperature oil outlet pipe 310 to control the opening and closing of the high-temperature oil outlet pipe 310.

[0056] The low-temperature oil outlet valve 373 is connected in the low-temperature oil outlet pipe 320 to control the opening and closing of the low-temperature oil outlet pipe 320.

[0057] The high-temperature return valve 372 is connected in the high-temperature return pipe 350 to control the opening and closing of the high-temperature return pipe 350.

[0058] The cryogenic return valve 374 is connected in the cryogenic return pipe 360 ​​to control the opening and closing of the cryogenic return valve 374.

[0059] The control system is electrically connected to the high-temperature oil outlet valve 371, the high-temperature oil return valve 372, the low-temperature oil outlet valve 373, and the low-temperature oil return valve 374.

[0060] With the high-temperature oil outlet valve 371 and the high-temperature oil return valve 372 in the open state, and the low-temperature oil outlet valve 373 and the low-temperature oil return valve 374 in the closed state, the control system controls the stepper motor to rotate forward, driving the medium in the high-temperature oil tank 110 to flow through the high-temperature oil outlet pipe 310 and the first weldless connection ring pipe 330 to the second weldless connection ring pipe 340 to perform a thermal shock test on the second weldless connection ring. Another part of the medium flows back to the high-temperature oil tank 110 through the high-temperature oil return pipe 350.

[0061] The low-temperature oil outlet valve 373 is in the open state, the low-temperature oil return valve 374 is in the open state, the high-temperature oil outlet valve 371 is in the closed state, and the high-temperature oil return valve 372 is in the closed state. The control system controls the stepper motor to rotate in reverse, driving the medium in the low-temperature oil tank 210 through the low-temperature oil outlet pipe 320, the second weldless connection ring pipe 340, and the first weldless connection ring pipe 330 to the high-temperature oil tank 110, so as to perform a thermal shock test on the first weldless connection ring 120. Another part of the medium flows back to the low-temperature oil tank 210 through the low-temperature oil return pipe 360.

[0062] In other embodiments of this application, a method for testing the thermal shock of solderless connection rings in a household refrigerator refrigeration system is disclosed. The method involves using the aforementioned testing fixture for the thermal shock of solderless connection rings in a household refrigerator refrigeration system to test the solderless connection rings. The testing steps are as follows: S1: Set the operating temperature of the high temperature test chamber to 100°C.

[0063] Specifically, the operating temperature of the high-temperature test chamber 100 is set to the first temperature, which is 85℃ to 120℃.

[0064] Set the operating temperature of the low-temperature test chamber to 200°C.

[0065] Specifically, the operating temperature of the low-temperature test chamber 100 is set to the second temperature, which is -45℃ to -30℃.

[0066] The specific temperatures set for the high-temperature test chamber 100 and the low-temperature test chamber 200 are determined according to the specific testing requirements.

[0067] S2: The control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber 100 has reached the first temperature and the low-temperature test chamber 200 has reached the second temperature. Since the control system is electrically connected to the high-temperature test unit and the low-temperature test unit, the high-temperature test unit feeds back the temperature information collected in the high-temperature test chamber 100 to the control system, and the low-temperature test unit feeds back the temperature information collected in the low-temperature test chamber 200 to the control system. The collected temperature information of the high-temperature test chamber 100 and the low-temperature test chamber 200 are compared with the first temperature and the second temperature. If it is determined that the temperature has reached the first temperature and the second temperature respectively, the subsequent experiment can be carried out. If it is determined that the temperature has not reached the first temperature and the second temperature, it is necessary to continue to wait until the first temperature and the second temperature are reached, and then the subsequent experiment can be carried out.

[0068] S3: The control system controls the high temperature oil outlet valve 371 to close, the low temperature oil outlet valve 373 to open, the high temperature oil return valve 372 to close, the low temperature oil return valve 374 to open, and the motor 410 to rotate in the reverse direction for time T1. This allows the medium in the cryogenic oil tank 210 to be output from the cryogenic oil tank 210 through the cryogenic oil outlet pipe 320 and the second weldless connection ring pipe 340, and to flow through the first weldless connection ring pipe 330 to test the first weldless connection ring 120; another part of the medium flows back through the cryogenic oil return pipe 360. S4: After the motor 410 rotates in the reverse direction for a time T1, the motor 410 stops working; the above-mentioned thermal shock to the first weldless connecting ring 120 is completed; The control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber 100 has reached the first temperature and the low-temperature test chamber 200 has reached the second temperature. The high-temperature testing department feeds back the temperature information collected from the high-temperature test chamber 100 to the control system, and the low-temperature testing department feeds back the temperature information collected from the low-temperature test chamber 200 to the control system. The collected temperature information from the high-temperature test chamber 100 and the low-temperature test chamber 200 are compared with the first temperature and the second temperature. If it is determined that the temperature has reached the first temperature and the second temperature respectively, the subsequent experiment can be carried out. If it is determined that the temperature has not reached the first temperature and the second temperature, it is necessary to continue to wait until the first temperature and the second temperature are reached, and then the subsequent experiment can be carried out. S5: The control system controls the high-temperature oil outlet valve 371 to open, the low-temperature oil outlet valve 373 to close, the high-temperature oil return valve 372 to open, and the low-temperature oil return valve 374 to close, and the motor 410 to rotate forward for time T2. This allows the medium in the high-temperature oil tank 110 to be output from the high-temperature oil tank 110 through the high-temperature oil outlet pipe 310 and the first weldless connection ring pipe 330, and to flow through the second weldless connection ring pipe 340 to test the second weldless connection ring 220; another part of the medium flows back through the high-temperature oil return pipe 350. S6: After motor 410 rotates in the reverse direction for time T2, motor 410 stops working, completing the above-mentioned thermal shock to the second weldless connecting ring 220; Repeat steps S2 to S5 for N trials.

[0069] The number of cycles N in the above experiment shall not be less than 50.

[0070] The single run time of the above experiment can be 2 minutes for T1 and 2 minutes for T2.

[0071] In some embodiments of this application, the medium is aviation hydraulic oil. The selection of aviation hydraulic oil must match the temperature setting requirements of the high-temperature test chamber and the low-temperature test chamber.

[0072] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0073] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0074] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fixture for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator, characterized in that, include: A high-temperature test chamber is provided with a high-temperature oil tank and a first weld-free connecting ring, wherein the high-temperature test chamber provides a first temperature to the high-temperature oil tank; A low-temperature test chamber is provided with a low-temperature oil tank and a second weld-free connecting ring. The low-temperature test chamber and the low-temperature oil tank provide a second temperature. A circulation pipeline is provided, in which a first solderless connecting ring and a second solderless connecting ring are connected; the first solderless connecting ring is connected to the high-temperature oil tank through the circulation pipeline, and the second solderless connecting ring is connected to the low-temperature oil tank through the circulation pipeline. Drive unit; The drive unit drives the medium in the low-temperature oil tank to flow through the circulation pipeline and through the first weld-free connecting ring into the high-temperature oil tank, and the drive unit drives the medium in the high-temperature oil tank to flow through the circulation pipeline and through the second weld-free connecting ring into the low-temperature oil tank.

2. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 1, characterized in that, The circulation pipeline includes a high-temperature oil outlet pipe, a low-temperature oil outlet pipe, a first weld-free connection ring pipeline, and a second weld-free connection ring pipeline. One end of the high-temperature oil outlet pipe and one end of the first weld-free connecting ring pipe are both connected to the high-temperature oil tank. One end of the low-temperature oil outlet pipe and one end of the second weld-free connecting ring pipe are both connected to the low-temperature oil tank. The other end of the high-temperature oil outlet pipe is connected to the other end of the first weldless connection ring pipe and the other end of the second weldless connection ring pipe through the driving part; the other end of the low-temperature oil outlet pipe is connected to the other end of the second weldless connection ring pipe and the other end of the first weldless connection ring pipe through the driving part.

3. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 2, characterized in that, The circulation pipeline also includes a high-temperature return oil pipe and a low-temperature return oil pipe; One end of the high-temperature return oil pipe is connected to the high-temperature oil tank, and the other end of the high-temperature return oil pipe is connected to one end of the second weldless connection ring pipeline; the medium in the high-temperature oil tank, under the driving state of the drive unit, flows through the high-temperature oil outlet pipe and the first weldless connection ring pipeline to the second weldless connection ring pipeline and the high-temperature return oil pipe, flows to the second weldless connection ring pipeline to test the second weldless connection ring, and the high-temperature return oil pipe is used to return oil to the high-temperature oil tank; One end of the low-temperature return oil pipe is connected to the low-temperature oil tank, and the other end of the low-temperature return oil pipe is connected to one end of the first weldless connection ring pipeline. The medium in the low-temperature oil tank, under the driving state of the drive unit, flows through the low-temperature oil outlet pipe and the second weldless connection ring pipeline to the first weldless connection ring pipeline and the high-temperature return oil pipe, and flows to the first weldless connection ring pipeline to test the first weldless connection ring. The low-temperature return oil pipe is used to return oil to the low-temperature oil tank.

4. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 3, characterized in that, The circulation pipeline includes: A high-temperature oil outlet valve is connected in the high-temperature oil outlet pipe to control the opening and closing of the high-temperature oil outlet pipe; And / or, a high-temperature return valve, which is connected in the high-temperature return pipe to control the on / off state of the high-temperature return pipe; And / or, a low-temperature oil outlet valve, which is connected in the low-temperature oil outlet pipe to control the opening and closing of the low-temperature oil outlet pipe; And / or, a cryogenic return valve, which is connected in the cryogenic return pipe to control the opening and closing of the cryogenic return pipe.

5. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 1, characterized in that, The drive unit includes a motor and a gear pump; The motor drives the high-temperature oil outlet pipe to discharge oil via the gear pump; or, the motor drives the low-temperature oil outlet pipe to discharge oil via the gear pump.

6. The fixture for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator according to claim 4, characterized in that, The high-temperature oil tank is equipped with a high-temperature measuring unit. The low-temperature oil tank is equipped with a low-temperature temperature measuring unit.

7. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 4, characterized in that, It also includes a control system, which is electrically connected to the drive unit, the high-temperature oil outlet valve, the high-temperature oil return valve, the low-temperature oil outlet valve, the low-temperature oil return valve, the high-temperature temperature measuring unit, and the low-temperature temperature measuring unit.

8. The fixture for testing the thermal shock of weld-free connecting rings in the refrigeration system of a household refrigerator according to claim 1, characterized in that, The first temperature ranges from 85°C to 120°C; the second temperature ranges from -45°C to -30°C.

9. A method for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator, characterized in that... include: S1: Set the operating temperature of the high-temperature test chamber; Set the operating temperature of the low-temperature test chamber; S2: The control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber has reached the first temperature and the low-temperature test chamber has reached the second temperature; S3: The control system controls the high-temperature oil outlet valve to close, the low-temperature oil outlet valve to open, the high-temperature oil return valve to close, the low-temperature oil return valve to open, and the motor to rotate in the reverse direction for time T1. S4: After the motor rotates in the reverse direction for a time T1, the motor stops working, and the control system acquires information from the high-temperature measuring unit and the low-temperature measuring unit to determine whether the high-temperature test chamber has reached the first temperature and the low-temperature test chamber has reached the second temperature. S5: The control system controls the high-temperature oil outlet valve to open, the low-temperature oil outlet valve to close, the high-temperature oil return valve to open, the low-temperature oil return valve to close, and the motor to rotate forward for time T2. S6: After the motor rotates forward for time T2, repeat steps S2 to S5 for N tests.

10. The fixture for testing the thermal shock of weld-free connection rings in the refrigeration system of a household refrigerator according to claim 9, characterized in that, The number of trials N shall not be less than 50.

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