Vacuum helium leak detection device for valve

Abstract

The utility model relates to the technical field of valve detection, in particular to a vacuum helium leak detection device for a valve. The device comprises a first vacuum joint mounted on a workbench and a hand-operated lifting platform extending vertically, wherein a second vacuum joint corresponding to the first vacuum joint up and down is mounted on the hand-operated lifting platform; the two sealing assemblies are installed on the working table and the hand-operated lifting table respectively and connected with the first vacuum connector and the second vacuum connector respectively, each sealing assembly comprises a hollow sealing body connected with the vacuum connectors, each sealing body is provided with a horizontal sealing face and an axial sealing face, a sealing gasket is arranged on each horizontal sealing face, and the axial sealing face is provided with an axial sealing face. A sealing ring is arranged on the axial sealing surface; the upper end of the second vacuum joint is connected with a helium source; and the lower end of the first vacuum joint is connected with a helium mass spectrometer leak detector. According to the utility model, the technical problems of inaccurate test result and low detection efficiency caused by the fact that the fastening bolts need to be manually tightened one by one when the sealing performance of the valve is detected in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve detection, in particular to a vacuum helium leak detection device for valves. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium (such as temperature, pressure and flow). It has multiple functions such as shutoff, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief.

[0003] For valves, sealing is key to ensuring system safety and stable production. Therefore, sealing testing is essential during the valve production process. Currently, valve sealing testing is typically performed by clamping the valve ends with a clamping fixture and manually tightening bolts. The clamping force of the clamping fixture is then used to achieve sealing. Pressure testing is then performed as required, and the test phenomena and data are recorded.

[0004] Although the above method can detect the sealing of the valve, during the bolt tightening process, it is necessary to manually tighten the tightening bolts one by one. It is very easy for the operators to have different skill levels and force control capabilities, resulting in uneven force on the bolts, causing sliding dislocation between the sealing seat and the valve port, affecting the accuracy of the sealing test results; in addition, manually tightening the tightening bolts one by one is too dependent on manual operation, which consumes a lot of human resources and operation time, resulting in a significant reduction in detection efficiency. Utility Model Content

[0005] The utility model provides a vacuum helium leak detection device for valves, which solves the technical problem in the prior art that when detecting the sealing performance of valves, manual tightening of fastening bolts is required, which easily leads to inaccurate test results and low detection efficiency.

[0006] In order to solve the above problems, the vacuum helium leak detection device for valves provided by the present invention adopts the following technical solutions:

[0007] A vacuum helium leak detection device for a valve, comprising:

[0008] A workbench is provided with a vertically extending hand-cranked lifting platform. A first vacuum joint and a second vacuum joint are respectively provided on the workbench and the hand-cranked lifting platform. The two vacuum joints correspond to each other and are used to connect the upper and lower ends of the valve to be tested, respectively. A plug is provided on the top of the second vacuum joint.

[0009] Two sealing assemblies are mounted on the workbench and the hand-cranked lifting platform, respectively, with opposite ends thereof connected to the first vacuum connector and the second vacuum connector, respectively. The sealing assemblies include a hollow sealing body connected to the vacuum connectors, the sealing body having a horizontal sealing surface and an axial sealing surface for contacting the end face and inner wall of the valve to be tested, respectively. A sealing gasket is provided on the horizontal sealing surface, and a sealing ring is provided on the axial sealing surface.

[0010] a helium source connected to the upper end of the second vacuum connector;

[0011] A helium mass spectrometer leak detector is connected to the lower end of the first vacuum connector.

[0012] The beneficial effects of the vacuum helium leak detection device for valves provided by the utility model are:

[0013] 1. By installing a sealing assembly including a sealing body on both the workbench and the hand-cranked lifting platform, the opposite ends of the two sealing bodies are respectively used to connect with the upper and lower ends of the valve to be tested, and there is not only a horizontal sealing surface between the sealing body and the valve to be tested that contacts the end face of the valve to be tested, but also an axial sealing surface that contacts the inner wall of the valve to be tested. A sealing gasket is provided on the horizontal sealing surface, and a sealing ring is provided on the axial sealing surface. This can ensure both the end face sealing and the axial sealing of the valve to be tested, thereby achieving internal and external double sealing of the valve to be tested, better sealing effect, and greatly improving the accuracy of the test results. When installing the valve to be tested, no additional fasteners are required. It is only necessary to install the two ends of the valve to be tested on the two sealing bodies respectively. The sealing body, sealing gasket and sealing ring can be used to achieve reliable installation of the valve to be tested. The operation process is simple, which greatly improves the detection efficiency.

[0014] 2. By installing a vertically extending hand-cranked lifting platform on the workbench and installing the second vacuum joint on the hand-cranked lifting platform, the installation height of the second vacuum joint can be adjusted by operating the hand-cranked lifting platform to adapt to valves of different heights, thereby greatly improving its scope of application.

[0015] Through the above arrangement, the utility model effectively solves the technical problem in the prior art that when testing the sealing performance of a valve, it is necessary to manually tighten the fastening bolts one by one, which easily leads to inaccurate test results and low testing efficiency.

[0016] Furthermore, a valve stem support frame is installed on the workbench, and the valve stem support frame is located beside the first vacuum joint to assist in supporting the valve to be tested.

[0017] Furthermore, the valve stem support frame is a liftable valve stem support frame.

[0018] Furthermore, the hand-cranked lifting platform includes a slide vertically installed on the workbench, the slide includes a slide body and a slider installed on the slide body, the upper end of the slide body has a handwheel, a horizontally extending swing arm is installed on the slider, and the second vacuum joint is installed on the swing arm.

[0019] Furthermore, the slide is a screw slide.

[0020] Furthermore, the sealing body has an external thread at one end away from the axial sealing surface, the workbench and the hand-cranked lifting platform are provided with internal threads matching the external thread, and the sealing body is screwed onto the workbench or the hand-cranked lifting platform.

[0021] Beneficial effects: The sealing body is connected to the workbench and the hand-cranked lifting platform through threads, and the connection method is reliable and simple, which can realize the rapid disassembly and replacement of the sealing body.

[0022] Furthermore, the first vacuum joint is connected to the helium mass spectrometer leak detector via a vacuum pipe.

[0023] Furthermore, the vacuum pipe is a metal pipe.

[0024] Furthermore, the workbench includes a horizontally arranged work surface, and a plurality of support columns are arranged at the bottom of the work surface.

[0025] Furthermore, a universal wheel is provided at the bottom of the support column. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 This is a schematic diagram of the application structure of the vacuum helium leak detection device for valves provided by the utility model;

[0028] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0029] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0030] Description of reference numerals:

[0031] 1. First vacuum joint; 2. Second vacuum joint; 3. Valve to be tested; 4. Sealing body; 5. Horizontal sealing surface; 6. Axial sealing surface; 7. Sealing gasket; 8. Sealing ring; 9. Liftable valve stem support bracket; 10. Slide body; 11. Slider; 12. Handwheel; 13. Swing arm; 14. Metal pipe; 15. Steel plate; 16. Angle steel; 17. Support column; 18. Universal wheel; 19. First channel steel; 20. Second channel steel; 21. Through hole. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that the main idea of the vacuum helium leak detection device for valves provided by the utility model is: by setting up two groups of sealing components, each including a sealing body, which are respectively installed on a workbench and a hand-cranked lifting platform, and the opposite ends of the two sealing bodies are respectively used to connect with the upper and lower ends of the valve to be tested, and the sealing body has both a horizontal sealing surface in contact with the end face of the valve to be tested and an axial sealing surface in contact with the inner wall of the valve to be tested. A sealing gasket is set on the horizontal sealing surface, and a sealing ring is set on the axial sealing surface to ensure the end face sealing and axial sealing of the valve to be tested, which can effectively improve the sealing effect of the valve to be tested, thereby improving the accuracy of the test results. When in use, the valve to be tested is installed on the sealing body, and the sealing body, sealing gasket and sealing ring can be used to achieve reliable installation of the valve to be tested without the use of additional fasteners. The operation process is simple and can effectively improve the detection efficiency.

[0034] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0035] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0036] Example 1 of the vacuum helium leak detection device for valves provided by the present invention:

[0037] like Figures 1 to 3As shown, the vacuum helium leak detection device for valves includes a workbench with a vertically extending hand-cranked lifting platform installed on the workbench. Both the workbench and the hand-cranked lifting platform are installed with sealing components, and are respectively installed with a first vacuum joint 1 and a second vacuum joint 2. The two vacuum joints are respectively connected to a helium mass spectrometer leak detector and a helium source, and the second vacuum joint 2 is equipped with a plugging cover.

[0038] The following describes the structural components of the workbench. The workbench comprises a work surface, with support columns 17 positioned at the bottom of the corners. Each support column 17 is fitted with a universal wheel 18 for easy movement. Attached to the work surface, from left to right, are a hand-cranked lift, the first vacuum connector 1, and a valve stem support frame.

[0039] Specifically, the top ends of two adjacent support columns 17 are connected by angle steel 16, and the working surface is a steel plate 15, which is welded to the angle steel 16. The angle steel 16 is welded with a first channel steel 19 and a second channel steel 20 with openings facing downward, which correspond to the positions of the hand-cranked lifting platform and the first vacuum joint 1 respectively. The upper end of the first vacuum joint 1 is welded to the second channel steel 20, and its lower end is connected to the helium mass spectrometer leak detector, and a gasket and a clamp are provided at the connection position to ensure the reliability of the connection.

[0040] Specifically, the first vacuum joint 1 is connected to the helium mass spectrometer leak detector via a vacuum pipe, and the vacuum pipe is a metal pipe 14 .

[0041] Specifically, the valve stem support frame is a liftable valve stem support frame 9 , which is fixedly mounted on the top surface of the steel plate 15 .

[0042] Next, we'll describe the structure of the hand-cranked lift and its installation on the workbench. The hand-cranked lift includes a slide mounted vertically on the workbench. The slide consists of a main body 10 and a slider 11 mounted on the main body 10. The upper end of the main body 10 has a handwheel 12. The slider 11 is mounted with a swing arm 13 extending horizontally to the right. The second vacuum connector 2 is mounted on the swing arm 13. Corresponding mounting holes are provided in the steel plate 15 and the first channel steel 19. The lower end of the slide extends downward through the mounting holes.

[0043] Specifically, the slide is a screw slide, a through hole 21 is opened on the swing arm 13 , and the lower end of the second vacuum joint 2 is welded to the top surface of the swing arm 13 and is coaxially arranged with the through hole 21 .

[0044] Finally, the structural composition of the sealing assembly and its installation on the workbench and hand-cranked lifting platform are introduced. The sealing assembly includes a hollow sealing body 4 connected to the vacuum joint. The sealing body 4 has a horizontal sealing surface 5 and an axial sealing surface 6 for contacting the valve 3 to be tested. The horizontal sealing surface 5 is distributed circumferentially with the axial sealing surface 6. A sealing gasket 7 is provided on the horizontal sealing surface 5, and a sealing ring 8 is provided on the axial sealing surface 6 to simultaneously ensure the sealing of the end face and axial surface of the valve to be tested, reduce the probability of air leakage during the test, and thus improve the accuracy of the test results. The end of the sealing body 4 facing away from the axial sealing surface has an external thread, and the steel plate 15 and the lower end of the through hole 21 are both provided with internal threads that match the external threads. The sealing body 4 is screwed into the steel plate 15 or the through hole 21.

[0045] Specifically, a groove is formed on the axial sealing surface 6 of the sealing body 4 , and the sealing ring 8 is installed in the groove.

[0046] It should be noted that the sealing body 4 can be a DN40 sealing body, a DN25 sealing body, a DN20 sealing body, or a DN15 sealing body.

[0047] The working principle of the vacuum helium leak detection device for valves provided by the utility model is:

[0048] When testing the internal channel leakage rate of the valve to be tested 3, the lower end of the valve to be tested 3 in the closed state is sealed and connected to the sealing body 4 installed on the steel plate 15. Then, the hand wheel 12 is rotated to adjust the height of the swing arm 13 so that the axial sealing surface 6 and the horizontal sealing surface 5 of the sealing body 4 installed on the swing arm 13 are in contact with the end face and inner wall of the upper end of the valve to be tested 3 respectively, ensuring that the valve to be tested 3 is clamped between the two sealing bodies 4. Then, the height of the liftable valve stem support frame 9 is adjusted to assist in supporting the valve to be tested 3. Next, the helium mass spectrometer leak detector is connected through the metal pipe 14, and it is vacuumed. The helium leak rate of the mass spectrometer is observed to ensure that the no-load leak rate of the valve vacuum helium test reaches 10 -12 Pa·m 3 ·S -1 Next, helium is delivered through a helium source, and the helium leakage is detected using a helium mass spectrometer leak detector to obtain the valve detection result;

[0049] When testing the leakage rate of the external flange of the valve, the lower end of the valve to be tested 3 in the open state is sealed and connected to the sealing body 4 installed on the steel plate 15. Then, the hand wheel 12 is rotated to adjust the height of the swing arm 13 so that the axial sealing surface 6 and the horizontal sealing surface 5 of the sealing body 4 installed on the swing arm 13 are in contact with the end face and inner wall of the upper end of the valve to be tested 3 respectively, ensuring that the valve to be tested 3 is clamped between the two sealing bodies 4. Then, the height of the liftable valve stem support frame 9 is adjusted to assist in supporting the valve to be tested 3. Next, the plugging cover is sealed on the upper end of the second vacuum joint 2. After that, the helium mass spectrometer leak detector is connected through the metal pipe 14 and evacuated. Helium is sprayed into the connection between the valve to be tested 3 and the sealing body 4 below. The leakage is detected by the helium mass spectrometer leak detector to obtain the leakage rate of the external flange of the valve to be tested 3.

[0050] Finally, the hand wheel 12 is rotated to raise the swing arm 13 and remove the valve 3 to be tested. Then, the next valve 3 to be tested can be replaced and the above testing steps can be repeated for testing.

[0051] Example 2 of the vacuum helium leak detection device for valves provided by the present invention:

[0052] The main difference between it and Example 1 is:

[0053] In Example 1, the vacuum pipe is a metal pipe.

[0054] In this embodiment, the vacuum pipe is a polytetrafluoroethylene hose.

[0055] Example 3 of the vacuum helium leak detection device for valves provided by the present invention:

[0056] The main difference between it and Example 1 is:

[0057] In Example 1, the top ends of two adjacent support columns are connected by angle steel, and the working surface is welded to the angle steel.

[0058] In this embodiment, the top ends of two adjacent support columns are connected by a channel steel with an opening facing downward, and the working surface is welded to the top surface of the channel steel.

[0059] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0060] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A vacuum helium leak detection device for valves, characterized in that: include: A workbench is provided with a vertically extending hand-cranked lifting platform. A first vacuum joint and a second vacuum joint are respectively provided on the workbench and the hand-cranked lifting platform. The two vacuum joints correspond to each other and are used to connect the upper and lower ends of the valve to be tested, respectively. A plug is provided on the top of the second vacuum joint. Two sealing assemblies are mounted on the workbench and the hand-cranked lifting platform, respectively, with opposite ends thereof connected to the first vacuum connector and the second vacuum connector, respectively. The sealing assemblies include a hollow sealing body connected to the vacuum connectors, the sealing body having a horizontal sealing surface and an axial sealing surface for contacting the end face and inner wall of the valve to be tested, respectively. A sealing gasket is provided on the horizontal sealing surface, and a sealing ring is provided on the axial sealing surface. a helium source connected to the upper end of the second vacuum connector; A helium mass spectrometer leak detector is connected to the lower end of the first vacuum connector.

2. The vacuum helium leak detection device for valves according to claim 1, characterized in that: A valve stem support frame is installed on the workbench and is located beside the first vacuum joint to assist in supporting the valve to be tested.

3. The vacuum helium leak detection device for valves according to claim 2, characterized in that: The valve stem support frame is a liftable valve stem support frame.

4. The vacuum helium leak detection device for valves according to any one of claims 1 to 3, characterized in that: The hand-cranked lifting platform includes a slide vertically installed on the workbench, the slide includes a slide body and a slider installed on the slide body, the upper end of the slide body is provided with a handwheel, a horizontally extending swing arm is installed on the slider, and the second vacuum joint is installed on the swing arm.

5. The vacuum helium leak detection device for valves according to claim 4, characterized in that: The slide is a screw slide.

6. The vacuum helium leak detection device for valves according to any one of claims 1 to 3, characterized in that: The end of the sealing body away from the axial sealing surface has an external thread, and the workbench and the hand-cranked lifting platform are provided with internal threads matching the external thread. The sealing body is screwed onto the workbench or the hand-cranked lifting platform.

7. The vacuum helium leak detection device for valves according to any one of claims 1 to 3, characterized in that: The first vacuum joint is connected to the helium mass spectrometer leak detector via a vacuum pipe.

8. The vacuum helium leak detection device for valves according to claim 7, characterized in that: The vacuum pipe is a metal pipe.

9. The vacuum helium leak detection device for valves according to any one of claims 1 to 3, characterized in that: The workbench comprises a horizontally arranged work surface, and a plurality of supporting columns are arranged at the bottom of the work surface.

10. The vacuum helium leak detection device for valves according to claim 9, characterized in that: The bottom of the support column is provided with a universal wheel.

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