Sealing performance testing device for valve core and valve cage

Abstract

The invention relates to a sealing performance testing device for a valve element and a valve cage. The sealing performance testing device for the valve element and the valve cage comprises a shell, an adjusting mechanism, a pressing mechanism and a collecting mechanism. A mounting cavity is formed in the shell, the valve cage and the valve element are both arranged in the mounting cavity, an air inlet and an air outlet which are communicated with the mounting cavity are formed in the shell, the valve element and the valve cage are matched to separate the air inlet and the air outlet, the adjusting mechanism penetrates through the shell and is connected with the valve element, and the adjusting mechanism is used for adjusting pretightening force between the valve element and the valve cage. The pressurizing mechanism is arranged outside the shell and connected with the air inlet, the pressurizing mechanism is used for introducing air into the air inlet, the collecting mechanism comprises a leading-out pipe and a collector with a solution, one end of the leading-out pipe is connected with the air outlet, and the other end of the leading-out pipe extends into the solution in the collector. According to the sealing performance testing device, the leakage condition before the regulating valve is put into use can be detected, so that the probability of later leakage of the regulating valve is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of valve seal testing, and specifically, to a sealing inspection device for a valve core and a valve cage. Background Art

[0002] A pneumatic control valve is an actuator in the automatic control process in the industrial field. It can quickly respond to the control system signal during the startup, shutdown, and normal operation of a power plant. It is a very important link in the automatic control system and is widely used in the systems of nuclear power plants. The leakage rate of the pneumatic control valve is directly related to the economic benefits of the unit. Therefore, strict requirements are imposed on the leakage rate of the pneumatic control valve. For the internal leakage of such valves in power plants, the general maintenance methods mainly include periodic maintenance and routine inspection. After problems occur, the valve is disassembled for inspection. There is a lack of a specific device for pressure seal testing, and it is impossible to intuitively and effectively verify whether the leakage rate of the valve meets the requirements. Due to the absence of a maintenance window, if it is found that the leakage exceeds the standard after the pneumatic control valve is put back into use, it will pose a great challenge to the system availability, and seriously, it will lead to a reduction in the power of the unit and the unit being taken out of service.

[0003] Therefore, it is necessary to invent an inspection device to conduct a seal test on the valve cage and the valve core, so as to reduce the probability of leakage after being put into use as much as possible, so as to verify whether the leakage rate meets the requirements as early as possible, so as to have time for treatment, which has great economic benefits. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, an embodiment of the present invention provides a sealing inspection device for a valve core and a valve cage. The inspection device can detect the leakage situation before the control valve is put into use, so as to reduce the probability of subsequent leakage of the control valve.

[0006] The sealing inspection device for a valve core and a valve cage according to the embodiment of the present invention includes: a housing, an installation cavity is provided in the housing, the valve cage and the valve core are both arranged in the installation cavity, an air inlet and an air outlet communicated with the installation cavity are provided on the housing, and the valve core and the valve cage cooperate to separate the air inlet and the air outlet; an adjusting mechanism, the adjusting mechanism penetrates through the housing and is connected to the valve core, and the adjusting mechanism is used to adjust the pre-tightening force between the valve core and the valve cage; a pressure boosting mechanism, the pressure boosting mechanism is arranged outside the housing and is connected to the air inlet, and the pressure boosting mechanism is used to introduce gas into the air inlet; a collecting mechanism, the collecting mechanism includes a lead-out pipe and a collector with a solution, one end of the lead-out pipe is connected to the air outlet, and the other end of the lead-out pipe extends into the solution in the collector.

[0007] A sealing inspection device for a valve core and a valve cage according to an embodiment of the present invention can fit the valve core and the valve cage in an installation cavity when inspecting the sealing performance of the valve core and the valve cage, so as to simulate the actual sealing working condition of the valve core and the valve cage. A pressurizing mechanism can inject air into the installation cavity. Since one end of a lead-out pipe is connected to an air outlet, and the other end of the lead-out pipe extends into the solution in a collector, the air leaking from the air outlet can be discharged through the lead-out pipe, so that bubbles are generated in the solution in the collector. An operator can collect the number of bubbles escaping within a set time to detect the sealing effect of the valve core and the valve cage. Thus, the leakage situation before the regulating valve is put into use can be detected, and the regulating valves with poor sealing performance can be eliminated to reduce the probability of later leakage of the regulating valve.

[0008] In some embodiments, the collecting mechanism further includes a pressure gauge, and the pressure gauge is arranged on the lead-out pipe. The other end of the lead-out pipe can be closed to detect the pressure of the lead-out pipe through the pressure gauge.

[0009] In some embodiments, the adjusting mechanism includes a frame body, a driving assembly and a valve rod. The frame body is installed on the shell. One end of the valve rod passes through the shell and is connected to the valve core, and the other end of the valve rod is connected to the driving assembly. The driving assembly is arranged on the frame body and is used to drive the valve rod to slide relative to the shell in the up and down direction of the shell.

[0010] In some embodiments, the driving assembly includes a handwheel, a push rod, a nut and a connecting component. The nut is installed on the frame body. The push rod is in threaded cooperation with the nut. The upper end of the push rod is connected to the handwheel, the lower end of the push rod is connected to the connecting component, the push rod can rotate relative to the connecting component along its circumferential direction, and the connecting component is connected to the valve rod.

[0011] In some embodiments, the connecting component includes a connecting seat and an elastic member. A sliding cavity is arranged in the connecting seat, the elastic member is arranged in the sliding cavity, the lower end of the push rod slides axially in the sliding cavity and abuts against the elastic member, and the elastic member presses the push rod in the direction towards the push rod.

[0012] In some embodiments, the connecting component further includes a movable pressing head. The movable pressing head is rotatably installed at the lower end of the push rod and is arranged in the sliding cavity, and the lower end of the movable pressing head abuts against the elastic member.

[0013] In some embodiments, the adjusting mechanism further includes a connecting block and a pointer. One end of the connecting block is connected to the movable pressing head, the other end of the connecting block is connected to the pointer, the pointer is arranged outside the connecting seat and corresponds to the scale on the outer wall of the connecting seat.

[0014] In some embodiments, the inspection device further includes a packing mechanism, which includes a stuffing box, a packing gland, and a packing element. The stuffing box is installed on the housing, the packing element is arranged in the stuffing box, the packing gland covers the stuffing box, and the valve stem passes through the packing gland, the packing element, and the stuffing box and then extends into the housing.

[0015] In some embodiments, the housing includes a housing base and a housing cover. The housing cover is detachably installed on the housing base to define the installation cavity, and the air inlet and the air outlet are arranged on the housing base.

[0016] In some embodiments, a first seal is provided between the housing base and the housing cover, and a second seal is provided between the valve cage and the housing base. Description of the Drawings

[0017] Figure 1 is an axonometric view of the sealing inspection device for the valve core and the valve cage according to the embodiment of the present invention.

[0018] Figure 2 is a cross-sectional view of the sealing inspection device for the valve core and the valve cage according to the embodiment of the present invention.

[0019] Reference Signs:

[0020] 1. Housing; 11. Housing base; 111. Air inlet; 112. Air outlet; 12. Housing cover; 13. Installation cavity; 14. First seal; 15. Second seal; 16. Non-verification seal detection tube; 17. Hook;

[0021] 2. Adjusting mechanism; 21. Frame; 22. Driving assembly; 221. Handwheel; 222. Push rod; 223. Nut; 224. Connecting component; 2241. Connecting seat; 22411. Sliding cavity; 2242. Elastic member; 2243. Movable pressing head; 23. Valve stem; 24. Connecting block; 25. Pointer;

[0022] 3. Pressurizing mechanism; 31. Pressurizing table; 32. Inlet pipe;

[0023] 4. Collection mechanism; 41. Outlet pipe; 42. Collector; 43. Pressure gauge;

[0024] 5. Packing mechanism; 51. Stuffing box; 52. Packing gland; 53. Packing element;

[0025] 6. Valve core;

[0026] 7. Valve cage. Detailed Embodiments

[0027] Embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] Reference will be made below to the Figure 1 and Figure 2 describe a sealing inspection device for a valve element and a valve cage according to an embodiment of the present invention.

[0029] The sealing inspection device for a valve element and a valve cage according to an embodiment of the present invention includes: a housing 1, an adjusting mechanism 2, a pressure applying mechanism 3, and a collecting mechanism 4. An installation cavity 13 is provided in the housing 1. Both the valve cage 7 and the valve element 6 are arranged in the installation cavity 13. An air inlet 111 and an air outlet 112 communicating with the installation cavity 13 are provided on the housing 1. The valve element 6 cooperates with the valve cage 7 to separate the air inlet 111 and the air outlet 112. It should be noted that the air inlet 111 corresponds to the inlet of the valve cage 7, and the air outlet 112 corresponds to the outlet of the valve cage 7. When the valve element 6 closes the valve cage 7, the air inlet 111 and the air outlet 112 can be separated by the valve element 6.

[0030] The adjusting mechanism 2 passes through the housing 1 and is connected to the valve element 6. The adjusting mechanism 2 is used to adjust the pre-tightening force between the valve element 6 and the valve cage 7. The pressure applying mechanism 3 is arranged outside the housing 1 and is connected to the air inlet 111. The pressure applying mechanism 3 is used to introduce gas into the air inlet 111. The collecting mechanism 4 includes a lead-out pipe 41 and a collector 42 containing a solution. One end of the lead-out pipe 41 is connected to the air outlet 112, and the other end of the lead-out pipe 41 extends into the solution in the collector 42.

[0031] For the sealing inspection device for a valve element and a valve cage according to an embodiment of the present invention, when inspecting the sealing performance of the valve element 6 and the valve cage 7, the valve element 6 and the valve cage 7 can be cooperated in the installation cavity 13 to simulate the actual sealing working condition of the valve element 6 and the valve cage 7. The pressure applying mechanism 3 can inject air into the installation cavity 13. Since one end of the lead-out pipe 41 is connected to the air outlet 112 and the other end of the lead-out pipe 41 extends into the solution in the collector 42, the air leaking from the air outlet 112 can be discharged through the lead-out pipe 41, so that bubbles are generated in the solution in the collector 42. The operator can collect the number of bubbles escaping within a set time to detect the sealing effect of the valve element 6 and the valve cage 7. Thus, the leakage situation before the regulating valve is put into use can be detected, the regulating valves with poor sealing performance can be eliminated, so as to reduce the probability of later leakage of the regulating valve, and the detection process is simple and convenient, and relatively intuitive.

[0032] For example, the collector 42 stores clear and transparent water. The end of the outlet pipe 41 extending into the collector 42 is immersed to a height greater than 5 cm below the liquid level, and the inclination angle is approximately 45°. The pressurizing mechanism 3 intakes air into the installation cavity 13 and maintains the pressure in the installation cavity 13 stable between 0 - 20 MPa. The detection time is not less than 15 seconds, thereby improving the detection accuracy of the leakage rate of the regulating valve.

[0033] Specifically, the pressurizing mechanism 3 includes a pressurizing platform 31 and an air inlet pipe 32. The pressurizing platform 31 is communicated with the air inlet 111 through the air inlet pipe 32 for pressurizing the installation cavity 13. The collecting mechanism 4 further includes a pressure gauge 43. The pressure gauge 43 is arranged on the outlet pipe 41, and the other end of the outlet pipe 41 can be closed to detect the pressure of the outlet pipe 41 through the pressure gauge 43. It can be understood that when detecting the pressure in the installation cavity 13, the pressure can be detected through the pressure gauge 43 at the position of the outlet pipe 41. During detection, the other end of the outlet pipe 41 is closed, so that the pressure in the outlet pipe 41 is the same as the pressure in the installation cavity 13.

[0034] Optionally, a hook 17 is provided on the housing 1. At the end of the test, the operator can hang the air inlet pipe 32 and the outlet pipe 41 on the hook 17 to facilitate the sorting and storage of the inspection device. A non-verified seal detection pipe 16 is also provided on the housing 1. The non-verified seal detection pipe 16 is communicated with the installation cavity 13 but not with the valve cavity formed by the valve core 6 and the valve cage 7.

[0035] In some embodiments, the adjusting mechanism 2 includes a frame body 21, a driving assembly 22, and a valve stem 23. The frame body 21 is installed on the housing 1. One end of the valve stem 23 (such as Figure 1 the lower end of the valve stem 23) penetrates through the housing 1 and is connected to the valve core 6, and the other end of the valve stem 23 (such as Figure 1 the upper end of the valve stem 23) is connected to the driving assembly 22. The driving assembly 22 is arranged on the frame body 21 and is used to drive the valve stem 23 to slide relative to the housing 1 in the up and down direction of the housing 1. It can be understood that the driving assembly 22 can be manually driven or electrically driven. The driving assembly 22 drives the valve stem 23 to slide in the up and down direction of the housing 1 to drive the valve core 6 to separate from and seal the valve cage 7, and the sealing pre-tightening force between the valve core 6 and the valve cage 7 can be adjusted through the driving assembly 22 to simulate the axial working force under the actual working conditions of the regulating valve, thereby expanding the detection range and detection accuracy of the regulating valve.

[0036] Optionally, the driving component 22 includes a handwheel 221, a push rod 222, a nut 223, and a connecting component 224. The nut 223 is installed on the frame 21. The push rod 222 is in threaded cooperation with the nut 223. The upper end of the push rod 222 is connected to the handwheel 221, and the lower end of the push rod 222 is connected to the connecting component 224. The push rod 222 is rotatable relative to the connecting component 224 along its circumferential direction, and the connecting component 224 is connected to the valve stem 23. It can be understood that the driving component 22 is manually driven. An operator can drive the handwheel 221 to rotate. Under the action of the handwheel 221, the push rod 222 rotates and moves up and down relative to the nut 223. Under the connection action of the connecting component 224, the push rod 222 can drive the valve stem 23 to move up and down through the connecting component 224. Thus, the rotational motion of the handwheel 221 can be converted into the linear motion of the valve stem 23. By setting the driving component 22 to the above structure, the detection device according to the embodiment of the present invention can make the structure of the adjusting mechanism 2 simple and convenient to adjust.

[0037] Further, the connecting component 224 includes a connecting seat 2241 and an elastic member 2242. A sliding cavity 22411 is provided in the connecting seat 2241. The elastic member 2242 is arranged in the sliding cavity 22411. The lower end of the push rod 222 is slidably fitted in the sliding cavity 22411 along its axial direction and abuts against the elastic member 2242. The elastic member 2242 presses the push rod 222 in the direction towards the push rod 222. It can be understood that there is a gap between the push rod 222 and the connecting seat 2241. When the push rod 222 rotates, the push rod 222 will not drive the connecting seat 2241 to rotate synchronously. When the push rod 222 moves downward, the elastic member 2242 is compressed. The elastic member 2242 pushes the connecting seat 2241 to move downward under the action of the push rod 222. Thus, the valve stem 23 can be driven to move downward to increase the pre-tightening force between the valve core 6 and the valve cage 7. Similarly, when the push rod 222 moves upward, the elastic potential energy of the elastic member 2242 is released. Thus, the valve stem 23 can be driven to move upward to reduce the pre-tightening force between the valve core 6 and the valve cage 7.

[0038] Optionally, the connecting component 224 further includes a movable pressure head 2243. The movable pressure head 2243 is rotatably installed at the lower end of the push rod 222 and is arranged in the sliding cavity 22411. The lower end of the movable pressure head 2243 abuts against the elastic member 2242. Since the push rod 222 and the movable pressure head 2243 are rotatably connected, when the push rod 222 is manually driven to rotate, because the movable pressure head 2243 is squeezed between the push rod 222 and the elastic member 2242, therefore, the movable pressure head 2243 will not rotate with the rotation of the push rod 222. And the lower end of the movable pressure head 2243 abuts against the elastic member 2242, which can increase the contact area between the push rod 222 and the elastic member 2242. Thus, the transmission effect of the adjusting mechanism 2 can be better.

[0039] Optionally, the adjusting mechanism 2 further includes a connecting block 24 and a pointer 25. One end of the connecting block 24 is connected to the movable pressure head 2243, and the other end of the connecting block 24 is connected to the pointer 25. The pointer 25 is arranged outside the connecting seat 2241 and corresponds to the scale on the outer wall of the connecting seat 2241. It can be understood that when the movable pressure head 2243 moves up and down, since the pointer 25 is connected to the movable pressure head 2243 through the connecting block 24, the pointer 25 can be driven to move up and down, thereby displaying the pre-tightening force generated by the adjusting mechanism 2 to improve the visualization degree of the detection device.

[0040] Furthermore, the inspection device further includes a packing mechanism 5. The packing mechanism 5 includes a stuffing box 51, a packing pressing plate 52, and a packing member 53. The stuffing box 51 is installed on the housing 1. The packing member 53 is arranged in the stuffing box 51. The packing pressing plate 52 covers the stuffing box 51. The valve stem 23 passes through the packing pressing plate 52, the packing member 53, and the stuffing box 51 and then extends into the housing 1. It can be understood that the packing member 53 is used to seal the gap between the valve stem 23 and the stuffing box 51 to prevent gas from leaking through the gap at the connection between the housing 1 and the valve stem 23 and improve the sealing effect at the connection between the housing 1 and the valve stem 23. For example, the packing member can be a flexible graphite packing.

[0041] Specifically, the housing 1 includes a housing base 11 and a housing cover 12. The housing cover 12 is detachably installed on the housing base 11 to define an installation cavity 13. The air inlet 111 and the air outlet 112 are arranged on the housing base 11. For example, the housing cover 12 and the housing base 11 can be connected by threaded parts so that the operator can put the valve cage 7 and the valve core 6 into the installation cavity 13 or take the valve cage 7 and the valve core 6 out of the installation cavity 13.

[0042] Optionally, a first sealing member 14 is provided between the housing base 11 and the housing cover 12, and a second sealing member 15 is provided between the valve cage 7 and the housing base 11. For example, the first sealing member 14 and the second sealing member 15 can be elastic rubber gaskets. The first sealing member 14 can prevent the gas in the installation cavity 13 from leaking through the gap between the housing cover 12 and the housing base 11, and the second sealing member 15 can prevent the gas in the installation cavity 13 from leaking through the gap between the valve cage 7 and the housing base 11, thereby ensuring the accuracy of the airtightness detection of the regulating valve.

[0043] The operation method of the sealing inspection device for the valve core and the valve cage according to the embodiment of the present invention will be described in detail below.

[0044] Step 1: Clean the installation cavity 13 of the housing 1, and install a non-verified sealing winding gasket and an O-ring rubber seal on the housing base 11;

[0045] Step 2: Install the valve cage 7 and the valve core 6 of the pneumatic regulating valve to be verified in sequence and ensure the fit;

[0046] Step 3: Install the shell cover 12 on the shell base 11, and complete the assembly of the adjusting mechanism 2, the pressure boosting mechanism 3, the mobile phone mechanism, and the packing mechanism 5.

[0047] Step 4: Adjust the light source to the condition of sufficient illumination.

[0048] Step 5: Rotate the handwheel 221. While the push rod 222 rotates, it moves downward. Through the movable pressing head 2243 at the end of the push rod 222, the rotational plus linear motion of the push rod 222 is converted into the linear motion of the movable pressing head 2243. The pressing head can compress the elastic member 2242, driving the connecting seat 2241 to move downward, thereby driving the valve stem 23 to move downward, pressing the valve core 6 tightly. During the downward movement of the movable pressing head 2243, the pointer 25 can be driven to move up and down synchronously, and the direct reading can be taken through the scale on the frame body 21 to visualize the pre-tightening force of the valve core 6. By rotating the handwheel 221 and observing the reading, the magnitude of the pre-tightening force acting on the valve core 6 can be precisely adjusted, so as to simulate the axial working force under the actual working conditions. For example, the stiffness of the elastic member 2242 is 270 N / mm, the maximum working deformation of the elastic member 2242 is 39 mm, and the total force that can be applied is 10627 N.

[0049] Step 6: Start the pressure boosting platform 31, and send the gas into the installation cavity 13 of the housing 1 through the intake pipe 32. Control the intake through the pressure boosting platform 31 to keep the pressure in the cylinder body at 0 - 20 MPa.

[0050] Step 7: Inject clean and transparent water into the collector 42, connect the air outlet 112 to the outlet pipe 41. The inner diameter of the outlet pipe 41 is 5 mm, the wall thickness is 1 mm, the inclination angle is 45°, and the immersion depth in the liquid is not more than 5 cm.

[0051] Step 8: After waiting for the test parameters to stabilize, record the number of bubbles escaping, and the detection time is not less than 15 s.

[0052] Step 9: Obtain the leakage rate of the regulating valve according to the test results. The leakage rate of the regulating valve is:

[0053] In the formula: Q: gas leakage rate, Pa, m 3 / s;

[0054] P: local atmospheric pressure, Pa;

[0055] n: number of bubbles escaping within t seconds;

[0056] t: detection time, s.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0059] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0061] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0062] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the scope of protection of the present invention.

Claims

1. A sealing inspection device for a valve core and a valve cage, characterized in that, it includes: A housing, an installation cavity is provided in the housing, the valve cage and the valve core are both arranged in the installation cavity, an air inlet and an air outlet communicating with the installation cavity are provided on the housing, and the valve core cooperates with the valve cage to separate the air inlet and the air outlet; An adjusting mechanism, the adjusting mechanism penetrates through the housing and is connected to the valve core, and the adjusting mechanism is used to adjust the pre-tightening force between the valve core and the valve cage; A pressure boosting mechanism, the pressure boosting mechanism is arranged outside the housing and is connected to the air inlet, and the pressure boosting mechanism is used to introduce gas into the air inlet; A collecting mechanism, the collecting mechanism includes a lead-out pipe and a collector with a solution, one end of the lead-out pipe is connected to the air outlet, and the other end of the lead-out pipe extends into the solution of the collector.

2. The sealing inspection device for a valve core and a valve cage according to claim 1, characterized in that, The collecting mechanism further includes a pressure gauge, the pressure gauge is arranged on the lead-out pipe, and the other end of the lead-out pipe can be closed to detect the pressure of the lead-out pipe through the pressure gauge.

3. The sealing inspection device for a valve core and a valve cage according to claim 1, characterized in that, The adjusting mechanism includes a frame body, a driving component and a valve rod, the frame body is installed on the housing, one end of the valve rod penetrates through the housing and is connected to the valve core, the other end of the valve rod is connected to the driving component, and the driving component is arranged on the frame body and is used to drive the valve rod to slide relative to the housing in the up and down direction of the housing.

4. The sealing inspection device for a valve core and a valve cage according to claim 3, characterized in that, The driving component includes a handwheel, a push rod, a nut and a connecting component, the nut is installed on the frame body, the push rod is in threaded cooperation with the nut, the upper end of the push rod is connected to the handwheel, the lower end of the push rod is connected to the connecting component, the push rod can rotate relative to the connecting component along its circumferential direction, and the connecting component is connected to the valve rod.

5. The sealing inspection device for a valve core and a valve cage according to claim 4, characterized in that, The connecting component includes a connecting seat and an elastic member, a sliding cavity is provided in the connecting seat, the elastic member is arranged in the sliding cavity, the lower end of the push rod slides axially in the sliding cavity and abuts against the elastic member, and the elastic member presses the push rod in the direction towards the push rod.

6. The sealing inspection device for a valve core and a valve cage according to claim 5, characterized in that, The connecting component further includes a movable pressing head, the movable pressing head is rotatably installed at the lower end of the push rod and is arranged in the sliding cavity, and the lower end of the movable pressing head abuts against the elastic member.

7. The sealing inspection device for a valve core and a valve cage according to claim 6, characterized in that, The adjusting mechanism further includes a connecting block and a pointer. One end of the connecting block is connected to the movable pressing head, and the other end of the connecting block is connected to the pointer. The pointer is arranged outside the connecting seat and corresponds to the scale on the outer wall of the connecting seat.

8. The sealing inspection device for a valve core and a valve cage according to claim 3, wherein, it further includes a packing mechanism. The packing mechanism includes a stuffing box, a packing gland and a packing element. The stuffing box is installed on the housing. The packing element is arranged in the stuffing box. The packing gland covers the stuffing box. The valve stem passes through the packing gland, the packing element and the stuffing box and then extends into the housing.

9. The sealing inspection device for a valve core and a valve cage according to any one of claims 1-8, wherein, the housing includes a housing base and a housing cover. The housing cover is detachably installed on the housing base to define the installation cavity. The air inlet and the air outlet are arranged on the housing base.

10. The sealing inspection device for a valve core and a valve cage according to claim 9, wherein, a first sealing member is arranged between the housing base and the housing cover, and a second sealing member is arranged between the valve cage and the housing base.

Images