A temperature control valve plugging method and tool for transmission no-load testing

Abstract

The present application relates to the technical field of gearbox, and particularly relates to a temperature control valve plugging method and tool for gearbox no-load test; the temperature control valve is used for connecting two valve ports of an oil cooler, and the two valve ports are connected with an oil inlet pipe and an oil return pipe respectively; during the no-load test of the gearbox, the oil inlet pipe and the oil return pipe are plugged by using the tool before the test, so that oil overflow caused by the oil pressure rising at the valve port of the temperature control valve is avoided; the tool comprises two groups of temperature control valve port inner plugging assemblies, at least one group of temperature control valve clamping assemblies and at least one group of intermediate connecting assemblies; the intermediate connecting assemblies are used for fixedly connecting the temperature control valve port inner plugging assemblies and the temperature control valve clamping assemblies; the two groups of temperature control valve port inner plugging assemblies are respectively used for plugging the oil inlet pipe and the oil return pipe; and the temperature control valve clamping assemblies are detachably fixedly connected with the temperature control valve. The valve port of the temperature control valve is plugged by using the tool, so that the problem of oil overflow during the no-load test of the gearbox is avoided; when the gearbox outer shell is visually checked by a person, the judgment is more accurate, and the misjudgment problem is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gearbox, in particular to a temperature control valve plugging method and tool for gearbox no-load test. BACKGROUND

[0002] The complete assembly process of automobile gearbox involves three stages of sub-assembly, assembly and test. The main reasons for automobile gearbox oil leakage include: in the assembly stage, the joint surface of the gearbox body is not properly fitted; in the test stage, the oil way is blocked and there is a gap between the copper gasket and the threaded hole. The oil leakage of automobile gearbox directly affects the subsequent vehicle assembly matching driving, the satisfaction of vehicle enterprises and customers, and the brand image of the production gearbox enterprise. Therefore, in order to avoid and curb the oil leakage problem of the gearbox in service, the no-load test of the gearbox becomes an effective method, which can check whether the joint surface of the gearbox and the oil way blockage exist oil leakage and other problems before delivery, so as to avoid a series of negative effects and economic losses caused by oil leakage of the gearbox.

[0003] The existing no-load test of the whole gearbox is set under the condition of 750 rpm / min and not less than 60 seconds, to check whether the joint surface of the gearbox and the oil way blockage exist no-load oil leakage. In the process of no-load test under the set condition, since the temperature control valve is not connected with the oil cooler, the two valve ports of the temperature control valve connected with the oil cooler will cause oil overflow due to pressure rise. This brings challenges and difficulties to the subsequent manual visual detection of gearbox oil leakage. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a temperature control valve plugging method and tool for gearbox no-load test, which solves the problem of valve port oil overflow caused by internal oil pressure rise during no-load test of the gearbox, and has good plugging effect.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows: a temperature control valve plugging method for gearbox no-load test, the two valve ports of the temperature control valve for connecting the oil cooler are connected with the oil inlet pipe and the oil return pipe respectively; before the test, the oil inlet pipe and the oil return pipe are plugged by using the tool to avoid oil overflow caused by oil pressure rise at the valve port of the temperature control valve.

[0006] As a preferred technical scheme, the tool includes two groups of temperature control valve port inner plugging assemblies and two groups of temperature control valve clamping assemblies; the two groups of temperature control valve port inner plugging assemblies are used to plug the oil inlet pipe and the oil return pipe respectively, and the temperature control valve clamping assemblies are used to realize detachable fixed connection between the tool and the temperature control valve.

[0007] The temperature control valve port plug assembly comprises a spring push rod, a spring front stop ring, a spring, a spring rear stop ring, a main push rod, a temperature control valve port plug, a spring pressing rod and a spring stop ring connecting shell.

[0008] The spring push rod is connected with the rear end face of the main push rod as a whole, and the temperature control valve port plug is arranged on the front end face of the main push rod; the spring stop ring connecting shell is sleeved on the outside of the main push rod, the spring front stop ring and the spring rear stop ring are located in the spring stop ring connecting shell and are fixedly connected with the spring stop ring connecting shell, and the spring front stop ring and the spring rear stop ring are arranged in a spaced manner; the spring is sleeved on the outside of the main push rod, and the spring is located between the spring front stop ring and the spring rear stop ring, one end of the spring abuts against the spring front stop ring, and the other end of the spring is fixed on the main push rod; the spring pressing rod is installed on the outer wall of the main push rod, and the spring stop ring connecting shell is provided with a clamping groove.

[0009] The step of plugging the oil inlet pipe and the oil return pipe by using the tool comprises,

[0010] Before testing,

[0011] The temperature control valve clamping assembly is controlled to be in an open state to provide an operating space for the oil inlet pipe and the oil return pipe; the temperature control valve port plug is aligned with the oil inlet pipe and the oil return pipe, the spring push rod is pushed, the main push rod is moved towards the oil inlet pipe and the oil return pipe against the action of the spring force, and connection and plugging with the oil inlet pipe or the oil return pipe are completed; in the moving process of the main push rod, the spring pressing rod is pressed into the clamping groove to limit the main push rod; then the temperature control valve clamping assembly is fixedly connected with the temperature control valve to maintain the plugging state of the oil inlet pipe or the oil return pipe.

[0012] After testing is completed,

[0013] The temperature control valve clamping assembly is controlled to be open and separated from the temperature control valve; then the spring pressing rod is pressed, and the temperature control valve port plug is separated from the oil inlet pipe or the oil return pipe under the action of the spring.

[0014] As a preferred technical solution, the temperature control valve clamping assembly comprises a clamp, and the clamping surface of the clamp corresponds to the position of the temperature control valve port plug.

[0015] Before the temperature control valve port plug is aligned with the oil inlet pipe and the oil return pipe, the clamp is controlled to open the clamping part to provide a space for installation of the oil inlet pipe or the oil return pipe.

[0016] After the temperature control valve port plug is plugged into the oil inlet pipe and the oil return pipe, the clamp is adjusted to interact with the oil inlet pipe or the oil return pipe to complete clamping and fixing of the clamp.

[0017] The tool comprises two sets of temperature control valve inner plug assemblies, at least one set of temperature control valve clamping assemblies, and at least one set of intermediate connecting assemblies; the intermediate connecting assemblies are used to fixedly connect the temperature control valve inner plug assemblies and the temperature control valve clamping assemblies; the two sets of temperature control valve inner plug assemblies are respectively used to plug the oil inlet pipe and the oil return pipe; and the temperature control valve clamping assemblies are fixedly and detachably connected with the temperature control valve.

[0018] As a preferred technical solution, the temperature control valve inner plug assembly comprises a spring push rod, a spring front retainer ring, a spring, a spring rear retainer ring, a main push rod, a temperature control valve inner plug, a spring pressing rod, and a spring retainer ring connecting shell.

[0019] The spring push rod is integrally connected with the rear end face of the main push rod; the temperature control valve inner plug is arranged on the front end face of the main push rod; the spring retainer ring connecting shell is sleeved on the outer side of the main push rod; the spring front retainer ring and the spring rear retainer ring are both located in the spring retainer ring connecting shell and fixedly connected with the spring retainer ring connecting shell, and are arranged in a spaced manner; the spring is sleeved on the outer side of the main push rod, located between the spring front retainer ring and the spring rear retainer ring, and has one end abutting against the spring front retainer ring and the other end fixed on the main push rod; the spring pressing rod is installed on the outer side wall of the main push rod, and the spring retainer ring connecting shell is provided with a clamping groove matched with the spring pressing rod.

[0020] As a preferred technical solution, two spring pressing rods are arranged on the main push rod, and the clamping groove is in a long strip shape.

[0021] As a preferred technical solution, the temperature control valve inner plug is provided with a sleeving hole, and the inner diameter of the sleeving hole is adapted to the outer diameter of the oil inlet pipe or the oil return pipe.

[0022] As a preferred technical solution, the intermediate connecting assembly comprises an intermediate connecting plate provided with a through hole in which the main push rod is slidably arranged; and the spring retainer ring connecting shell is fixedly connected with the intermediate connecting plate.

[0023] As a preferred technical solution, the temperature control valve clamping assembly comprises a clamp connecting rod and a clamp; the clamp is fixedly installed on the intermediate connecting plate through the clamp connecting rod; the clamping surface of the clamp corresponds to the position of the temperature control valve inner plug; and a transverse anti-skid pattern is processed on the clamping surface.

[0024] As a preferred technical solution, the tool further comprises a fixed limiting seat fixedly connected with the intermediate connecting plate (11) or the spring retainer ring connecting shell, and used to assist the tool in being connected with the temperature control valve.

[0025] Thanks to the above technical solution, the temperature control valve plugging method and tool for the empty load test of the gearbox have the following advantages:

[0026] 1) The tool is used to block the valve port of the temperature control valve, avoiding the problem of oil overflow of the transmission during the no-load test process; when the transmission shell is visually inspected by the operator, the judgment is more accurate and there is no misjudgment problem.

[0027] 2) The tool has a simple structure, and through the joint action of the temperature control valve port inner blocking assembly and the temperature control valve clamping assembly, the oil inlet pipe and the oil return pipe of the temperature control valve are blocked, which is stable and reliable.

[0028] 3) The method has strong universality and is suitable for the temperature control valve blocking function of most transmissions under different no-load test conditions.

[0029] 4) Low cost, simple tool structure, low manufacturing cost; the method is simple to operate and has low labor cost. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a structural schematic diagram of the tool;

[0032] Figure 2 is a front view of the tool;

[0033] Figure 3 is a structural schematic diagram of the tool in the first visual angle state after removing the spring stop ring connecting shell;

[0034] Figure 4 is a structural schematic diagram of the tool in the second visual angle state after removing the spring stop ring connecting shell;

[0035] Figure 5 is a structural schematic diagram of the assembly of the fixed limiting seat and the tool;

[0036] Figure 6 is a schematic diagram of the application of the tool.

[0037] In the drawings:

[0038] 1-spring push rod; 2-spring front stop ring; 3-spring; 4-spring rear stop ring; 5-main push rod; 6-temperature control valve port inner blocking; 7-clamp connecting rod; 8-clamp; 9-spring pressing rod; 10-spring stop ring connecting shell; 11-intermediate connecting plate; 12-transverse anti-skid pattern; 13-clamping groove; 14-fixed limiting seat; 15-temperature control valve; 16-oil inlet pipe; 17-oil return pipe. DETAILED DESCRIPTION

[0039] As shown in Figure 6 two valve ports of the temperature control valve 15 are connected to the oil inlet pipe 16 and the oil return pipe 17 respectively, and the oil inlet pipe 16 and the oil return pipe 17 are used to connect the oil cooler. During the gearbox no-load test, the temperature control valve 15 does not need to connect the oil cooler, and the idle oil inlet pipe 16 and the oil return pipe 17 have the risk of oil leakage. In order to avoid the above technical problems, the present application provides a temperature control valve plugging method for gearbox no-load test, which uses tools to plug the oil inlet pipe 16 and the oil return pipe 17 respectively.

[0040] The tool includes a middle connecting assembly, two sets of temperature control valve port plugging assemblies, and two sets of temperature control valve clamping assemblies. One set of temperature control valve port plugging assemblies and one set of temperature control valve clamping assemblies correspond and are used together to plug the oil inlet pipe 16 or the oil return pipe 17. The temperature control valve port plugging assembly is used to plug the oil inlet pipe 16 or the oil return pipe 17 during the test, the temperature control valve clamping assembly is used to be detachably fixedly connected with the temperature control valve 15, and the middle connecting assembly connects the temperature control valve port plugging assembly and the temperature control valve clamping assembly into one body.

[0041] As shown in Figures 1-6 The temperature control valve port plugging assembly includes a spring push rod 1, a spring front retainer ring 2, a spring 3, a spring rear retainer ring 4, a main push rod 5, a temperature control valve port plugging 6, a spring pressure rod 9, and a spring retainer ring connecting shell 10.

[0042] The spring push rod 1 is integrally connected with the rear end face of the main push rod 5; the two can be integrally formed by machining, or can be fixedly connected into one body by welding, threaded connection or the like. The temperature control valve port plugging 6 is arranged on the front end face of the main push rod 5, and the temperature control valve port plugging 6 is provided with a sleeving hole or a plug matched with the oil inlet pipe 16 or the oil return pipe 17. If the sleeving hole is matched with the oil inlet pipe 16 or the oil return pipe 17, the inner diameter of the sleeving hole is adapted to the outer diameter of the oil inlet pipe 16 or the oil return pipe 17; if the plug is used, the outer diameter of the plug is adapted to the inner diameter of the oil inlet pipe 16 or the oil return pipe 17.

[0043] The spring retainer ring connecting shell 10 is sleeved on the outside of the main push rod 5, the spring front retainer ring 2 and the spring rear retainer ring 4 are located in the spring retainer ring connecting shell 10 and are fixedly connected with the spring retainer ring connecting shell 10, and the spring front retainer ring 2 and the spring rear retainer ring 4 are arranged in a spaced manner.

[0044] The spring 3 is sleeved on the outside of the main push rod 5, and the spring 3 is located between the spring front retainer ring 2 and the spring rear retainer ring 4. One end of the spring 3 abuts against the spring front retainer ring 2, and the other end is fixed on the main push rod 5.

[0045] The intermediate connecting assembly comprises an intermediate connecting plate 11 provided with a through hole in which the main push rod 5 is slidingly arranged. The spring retainer connecting shell 10 is fixedly connected with the intermediate connecting plate 11. The intermediate connecting plate 11 and the spring retainer connecting shell 10 are connected by welding, thereby achieving parallel discharge and fixed limiting of the two temperature control valve port inner plug assemblies. More importantly, the intermediate connecting plate 11 can alleviate and share the pressure at the temperature control valve port to some extent, thereby avoiding damage to the temperature control valve port inner plug assembly and problems such as insufficient tightness in the plugging process caused by the increase in pressure.

[0046] The spring press rod 9 is installed on the outer side wall of the main push rod 5. The part of the spring retainer connecting shell 10 close to the intermediate connecting plate 11 is provided with a clamping groove 13 in the shape of a long strip. When the tool is not working, the spring 3 is freely stretched. The spring press rod 9 is pressed inside the spring retainer connecting shell 10. When assembling the temperature control valve port inner plug 6 and the temperature control valve, an acting force is applied on the spring push rod 1 to push the main push rod 5, and the spring 3 is compressed. When the spring press rod 9 reaches the clamping groove 13, the spring press rod 9 pops out and is clamped in the clamping groove 13. At this time, the temperature control valve port inner plug 6 and the temperature control valve are connected and plugged.

[0047] The temperature control valve clamping assembly comprises a clamp connecting rod 7 and a clamp 8. The clamp 8 is fixedly installed on the intermediate connecting plate 11 through the clamp connecting rod 7. The clamping surface of the clamp 8 corresponds to the position of the temperature control valve port inner plug 6, and the clamping surface is processed with transverse anti-skid lines 12 perpendicular to the axial direction of the temperature control valve pipeline. The length of the clamp connecting rod 7 can be set according to the overall size of the temperature control valve of the transmission to be tested. Appropriately increasing the number of transverse anti-skid lines 12 can better achieve effective plugging of the temperature control valve port under different no-load test conditions.

[0048] It also comprises a fixed limiting seat 14 fixedly connected with the intermediate connecting plate 11 or the spring retainer connecting shell 10, which can assist in installation and better meet the plugging requirements of the temperature control valve port under higher no-load test pressure and longer test duration conditions.

[0049] When the transmission is tested under no load, after the transmission is fixed and installed on the no-load test bench, the motor and the corresponding connecting wire harness sensor parameters are controlled to perform no-load test. During the no-load test, it is observed whether there is oil leakage at the joint surface of the transmission case and the oil passage plugging position.

[0050] After the transmission is fixed and installed and before testing, the oil inlet pipe 16 and the oil return pipe 17 are plugged by using a tool, including the following steps:

[0051] Before testing,

[0052] The clamp 8 is controlled to open the clamping part to provide space for installation of the oil inlet pipe 16 or the oil return pipe 17;

[0053] Then, the temperature control valve port plug 6 is aligned with the oil inlet pipe 16 and the oil return pipe 17, the spring push rod 1 is pushed, the main push rod 5 is moved to the oil inlet pipe 16 and the oil return pipe 17 against the spring force until the connection and plugging with the oil inlet pipe 16 or the oil return pipe 17 are completed; during the movement of the main push rod 5, the two spring pressure rods 9 outside the main push rod 5 are pressed into the clamping groove 13 in the spring retainer ring connecting shell 10, so as to realize the limiting effect of the temperature control valve port plug assembly;

[0054] Next, the clamp 8 is adjusted, the transverse anti-skid lines 12 in the clamping area of the clamp 8 interact with the oil inlet pipe 16 or the oil return pipe 17, the clamping and fixing of the clamp 8 are completed, and the plugging state of the oil inlet pipe 16 or the oil return pipe 17 is maintained;

[0055] After the test is completed,

[0056] The clamp 8 is controlled to be opened and separated from the temperature control valve 15; then the spring pressure rod 9 is pressed, and the temperature control valve port plug 6 is separated from the oil inlet pipe 16 or the oil return pipe 17 under the action of the spring 3.

[0057] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A temperature control valve plugging method for gearbox no-load test, the temperature control valve (15) is used for connecting two valve ports of an oil cooler, which are connected with an oil inlet pipe (16) and an oil return pipe (17) respectively; characterized in that: When the gearbox is tested in no-load state, the oil inlet pipe (16) and the oil return pipe (17) are blocked by the tool before the test, so as to avoid the oil overflow caused by the oil pressure rising at the valve port of the temperature control valve (15); The tool comprises two sets of temperature control valve port inner blocking assemblies and two sets of temperature control valve clamping assemblies; the two sets of temperature control valve port inner blocking assemblies are respectively used for blocking the oil inlet pipe (16) and the oil return pipe (17), and the temperature control valve clamping assemblies are used for achieving the detachably fixed connection between the tool and the temperature control valve (15); The temperature control valve port inner blocking assembly comprises a spring push rod (1), a spring front stop ring (2), a spring (3), a spring rear stop ring (4), a main push rod (5), a temperature control valve port inner blocking piece (6), a spring pressing rod (9) and a spring stop ring connecting shell (10); The spring push rod (1) is integrally connected with the rear end face of the main push rod (5), the temperature control valve port inner blocking piece (6) is arranged on the front end face of the main push rod (5), the spring stop ring connecting shell (10) is sleeved on the outer side of the main push rod (5), the spring front stop ring (2) and the spring rear stop ring (4) are both located in the spring stop ring connecting shell (10) and fixedly connected with the spring stop ring connecting shell (10), and the spring front stop ring (2) and the spring rear stop ring (4) are arranged in a spaced manner; the spring (3) is sleeved on the outer side of the main push rod (5), the spring (3) is located between the spring front stop ring (2) and the spring rear stop ring (4), one end of the spring (3) abuts against the spring front stop ring (2), and the other end of the spring (3) is fixed on the main push rod (5); the spring pressing rod (9) is installed on the outer side wall of the main push rod (5), and the spring stop ring connecting shell (10) is provided with a clamping groove (13); The steps of blocking the oil inlet pipe (16) and the oil return pipe (17) by the tool comprise, Before the test, The temperature control valve clamping assembly is controlled to be in an open state, so as to provide an operating space for the oil inlet pipe (16) and the oil return pipe (17); the temperature control valve port inner blocking piece (6) is aligned with the oil inlet pipe (16) and the oil return pipe (17), the spring push rod (1) is pushed, the main push rod (5) is moved towards the oil inlet pipe (16) and the oil return pipe (17) against the spring force, and the connection and blocking with the oil inlet pipe (16) or the oil return pipe (17) are completed; in the moving process of the main push rod (5), the spring pressing rod (9) is pressed into the clamping groove (13), so as to limit the main push rod (5); the temperature control valve clamping assembly is fixedly connected with the temperature control valve (15), and the blocking state of the oil inlet pipe (16) or the oil return pipe (17) is maintained; After the test is completed, The temperature control valve clamping assembly is controlled to be opened, so that the temperature control valve clamping assembly is separated from the temperature control valve (15); then the spring pressing rod (9) is pressed, the temperature control valve port inner blocking piece (6) is separated from the oil inlet pipe (16) or the oil return pipe (17) under the action of the spring (3).

2. A temperature controlled valve plugging method for testing a transmission under no load as claimed in claim 1, characterized in that: The temperature control valve clamping assembly comprises a clamp (8), and the clamping face of the clamp (8) corresponds to the position of the temperature control valve port inner blocking piece (6); Before the temperature control valve port inner blocking piece (6) is aligned with the oil inlet pipe (16) and the oil return pipe (17), the clamp (8) is controlled to be opened, so as to provide a space for the installation of the oil inlet pipe (16) or the oil return pipe (17). After the temperature control valve port plug (6) is completed to block the accurate temperature oil inlet pipe (16) and the oil return pipe (17), the clamp (8) is adjusted to interact with the oil inlet pipe (16) or the oil return pipe (17) in the clamping area, and the clamping and fixing of the clamp (8) are completed.

3. Tool for use in the temperature-controlled valve plugging method for testing a gearbox empty according to claim 1 or 2, characterized in that: The temperature control valve port plug assembly includes two sets of temperature control valve port plug assemblies, two sets of temperature control valve clamping assemblies and at least one set of intermediate connecting assemblies; the intermediate connecting assembly is used for fixedly connecting the temperature control valve port plug assembly and the temperature control valve clamping assembly; the two sets of temperature control valve port plug assemblies are respectively used for blocking the oil inlet pipe (16) and the oil return pipe (17); and the temperature control valve clamping assembly is fixedly connected with the temperature control valve (15) in a detachable mode.

4. The tool of claim 3, wherein: The temperature control valve port plug assembly includes a spring push rod (1), a spring front check ring (2), a spring (3), a spring rear check ring (4), a main push rod (5), a temperature control valve port plug (6), a spring pressing rod (9) and a spring check ring connecting shell (10). The spring push rod (1) is connected with the rear end face of the main push rod (5) in an integrated mode; the temperature control valve port plug (6) is arranged on the front end face of the main push rod (5); the spring check ring connecting shell (10) is sleeved on the outer side of the main push rod (5); the spring front check ring (2) and the spring rear check ring (4) are located in the spring check ring connecting shell (10) and are fixedly connected with the spring check ring connecting shell (10); the spring front check ring (2) and the spring rear check ring (4) are arranged in a spaced mode; the spring (3) is sleeved on the outer side of the main push rod (5); the spring (3) is located between the spring front check ring (2) and the spring rear check ring (4); one end of the spring (3) is abutted against the spring front check ring (2), and the other end of the spring (3) is fixed on the main push rod (5); the spring pressing rod (9) is installed on the outer side wall of the main push rod (5); and the spring check ring connecting shell (10) is provided with a clamping groove (13) matched with the spring pressing rod (9).

5. The tool of claim 4, wherein: Two spring pressing rods (9) are arranged on the main push rod (5), and the clamping groove (13) is in a strip shape.

6. The tool of claim 4, wherein: The temperature control valve port plug (6) is provided with a sleeving hole, and the inner diameter of the sleeving hole is adapted to the outer diameter of the oil inlet pipe (16) or the oil return pipe (17).

7. The tool of claim 4, wherein: The intermediate connecting assembly includes an intermediate connecting plate (11), the intermediate connecting plate (11) is provided with a through hole, and the main push rod (5) is slidably arranged in the through hole; and the spring check ring connecting shell (10) is fixedly connected with the intermediate connecting plate (11).

8. The tool of claim 7, wherein: The temperature control valve clamping assembly includes a clamp connecting rod (7) and a clamp (8); the clamp (8) is fixedly installed on the intermediate connecting plate (11) through the clamp connecting rod (7); the clamping surface of the clamp (8) corresponds to the position of the temperature control valve port plug (6); and a transverse anti-skid pattern (12) is processed on the clamping surface.

9. The tool of claim 7, wherein: The temperature control valve clamping assembly further includes a fixed limiting seat (14), the fixed limiting seat (14) is fixedly connected with the intermediate connecting plate (11) or the spring check ring connecting shell (10), and is used for assisting the tool to be connected with the temperature control valve.

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