Detection device of vacuum arc-extinguishing chamber

Abstract

The utility model relates to a detection device for a vacuum arc-extinguishing chamber, and belongs to the field of devices for testing dielectric strength or breakdown strength. A detection device of a vacuum arc-extinguishing chamber comprises a pull rod which is arranged on a movable end cover plate in a penetrating mode and matched with the movable end cover plate in a sealing mode, and further comprises a rotation stopping piece arranged on the movable end cover plate, and the pull rod is provided with a rotation stopping structure which is matched with the rotation stopping piece in a guiding mode along the axis of an insulating cylinder. The rotation stopping member is provided with a guide structure which extends along the length direction of the insulating cylinder and is used for cooperating with the rotation stopping structure. Through the arrangement, the pull rod does not rotate in the process of moving relative to the insulating cylinder, so that the displacement of the pull rod can accurately represent the opening distance of the to-be-detected vacuum arc-extinguishing chamber, and the problem that in the prior art, when the opening distance of the movable end and the static end is adjusted in the process of testing the vacuum arc-extinguishing chamber, the opening distance is not adjusted is solved. As the rotation of the pull rod is not limited, the pull rod and the movable end rotate relatively, and the measurement result is inaccurate.

Description

Technical Field

[0001] The utility model relates to a detection device for a vacuum interrupter, belonging to the field of devices for testing dielectric strength or breakdown strength. Background Art

[0002] With the increasing demand for high voltage levels, the vacuum switches in the prior art are developing from medium voltage levels to higher voltage levels. The vacuum interrupter is the core component of the vacuum switch, and the performance of the vacuum interrupter directly affects the performance of the vacuum switch. In order to ensure product quality, it is necessary to conduct partial discharge and withstand voltage tests on the vacuum interrupter before leaving the factory. Since the voltage level during the test is relatively high and the size of the interrupter is relatively large, when detecting in air or in insulating liquid, the external insulation performance of the vacuum interrupter does not meet the test requirements, and there may be a situation where the external insulation is broken down before the moving and static contacts of the vacuum interrupter are broken down. Therefore, when detecting, it is also necessary to improve the external insulation performance of the vacuum interrupter.

[0003] The Chinese invention patent application with the publication date of June 11, 2021 and the publication number of CN112951647A discloses a vacuum interrupter aging and insulation test device. The device includes a cylindrical shell, a bottom plate (i.e., a static end cover plate) and an upper cover (i.e., a moving end cover plate) fixedly connected together. The cylindrical shell, the bottom plate and the upper cover form a cavity for accommodating the vacuum interrupter. The static end of the vacuum interrupter can be fixedly arranged on the bottom plate through a support. The device also includes a pull rod passing through the upper cover and connected to the moving conductive rod (i.e., the moving end) of the vacuum interrupter. A threaded section for connecting to the end of the moving conductive rod is arranged at the end of the pull rod. An adjusting nut is assembled outside the upper cover on the threaded section. The adjusting nut is supported on the upper cover under the pulling force of the moving conductive rod of the vacuum interrupter. By adjusting the position of the adjusting nut, the pull rod and the moving conductive rod can be maintained at a specific position, and thus a preset interval can be maintained with the static end of the vacuum interrupter. During the test, the vacuum interrupter is fixedly arranged in the cylinder, and circuits are connected to the pull rod and the bottom plate respectively for pressurization to conduct the test.

[0004] In the above technical solution, the opening distance between the moving end and the static end of the vacuum interrupter is separated by an adjusting nut. The adjusting nut is assembled on the threaded section of the pull rod. When adjusting the opening distance of the vacuum interrupter, it is necessary to correspondingly screw the adjusting nut to different positions. However, the pull rod and the moving end are also assembled together by a nut. When adjusting the position of the pull rod, if the pull rod rotates relative to the moving end, it will cause the expected adjusted opening distance to be inconsistent with the actual opening distance, resulting in inaccurate measurement results. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a detection device for a vacuum interrupter, which is used to solve the problem in the prior art that during the process of adjusting the opening distance between the moving end and the static end in the test of the vacuum interrupter, due to the lack of limit on the rotation of the pull rod, the pull rod and the moving end rotate relative to each other, resulting in inaccurate measurement results.

[0006] To achieve the above object, a detection device for a vacuum interrupter in the present utility model adopts the following technical solutions:

[0007] A detection device for a vacuum interrupter includes a cavity formed by assembling an insulating cylinder body, a moving end cover plate and a static end cover plate for accommodating the vacuum interrupter to be detected. The detection device also includes a pull rod passing through the moving end cover plate and hermetically cooperating with the moving end cover plate. The pull rod has an exposed section exposed outside the cavity. The detection device for the vacuum interrupter further includes a rotation stopping member provided on the moving end cover plate. A rotation stopping structure is provided on the pull rod and is guided and cooperated with the rotation stopping member along the axis of the insulating cylinder body. A guiding structure extending along the length direction of the insulating cylinder body is provided on the rotation stopping member for cooperating with the rotation stopping structure.

[0008] Further, the rotation stopping member is a sleeve with one end axially open. A limiting plate is provided at the end of the sleeve far from the moving end cover plate. An adjusting nut is threadedly assembled on the exposed section and is blocked outside the limiting plate.

[0009] Further, the guiding structure is a long hole opened on the side wall of the sleeve for the rotation stopping member to insert.

[0010] Further, the rotation stopping structure is a rotation stopping rod perpendicular to the axis of the pull rod. The rotation stopping rod is guided and cooperated with the guiding structure during the axial movement of the pull rod.

[0011] Further, a positioning hole perpendicular to the axis of the pull rod is provided on the pull rod. The rotation stopping rod is inserted and fixed in the positioning hole.

[0012] Further, the pull rod includes a smooth rod section in the middle and threaded sections at both ends of the smooth rod section. The positioning hole is provided at one end of the smooth rod section.

[0013] Further, a shielding cover is also provided at the end of the pull rod close to the moving end.

[0014] Further, the pull rod includes a smooth rod section in the middle and a threaded section for connecting the moving end of the vacuum interrupter. The shielding cover has a through hole for the pull rod to pass through. The diameter of the through hole is larger than the diameter of the threaded section and smaller than the diameter of the smooth rod section so that the shielding cover is clamped between the end face of the smooth rod section and the moving end.

[0015] Further, a valve for inflating and deflating is also provided on the moving end cover plate.

[0016] Furthermore, a support base for fixing the vacuum interrupter to be tested is fixedly arranged on the static end cover plate, and a positioning groove for positioning and installing the support base is arranged on the static end cover plate, and the positioning groove is adapted to the bottom surface of the support base.

[0017] The beneficial effects of the detection device for the vacuum interrupter in the present utility model are as follows: The present utility model improves the existing detection device for the vacuum interrupter. By providing an insulating cylinder body, a moving end cover plate and a static end cover plate, it is convenient to form an independent cavity for accommodating the vacuum interrupter to be detected, which is convenient for conducting tests; by passing a pull rod through the moving end cover plate and providing an exposed section on the pull rod, it is convenient to pull the moving end of the vacuum interrupter to be detected, thereby adjusting the opening distance of the vacuum interrupter; since the pull rod and the moving end cover plate are in sealed cooperation, it is convenient to pressurize the cavity; by providing a rotation prevention member on the moving end cover plate, providing a guiding structure on the rotation prevention member, and providing a rotation prevention structure adapted to the guiding structure on the pull rod, it is convenient for the pull rod not to rotate during the process of moving relative to the insulating cylinder body, so that the displacement of the pull rod can accurately represent the opening distance of the vacuum interrupter to be detected, thus solving the problem in the prior art that during the process of adjusting the opening distance between the moving end and the static end during the test of the vacuum interrupter, due to the lack of limit on the rotation of the pull rod, the pull rod and the moving end rotate relative to each other, resulting in inaccurate measurement results. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of the detection device for the vacuum interrupter in the present utility model;

[0019] Figure 2 It is a front view of the sleeve of Embodiment 1 of the detection device for the vacuum interrupter in the present utility model;

[0020] Figure 3 It is a cross-sectional view of the sleeve of Embodiment 1 of the detection device for the vacuum interrupter in the present utility model.

[0021] In the figure: 11, static end cover plate; 12, insulating cylinder body; 13, moving end cover plate; 14, sealing ring; 15, support base; 16, shaft seal; 2, vacuum interrupter; 31, first threaded section; 32, second threaded section; 33, smooth rod section; 34, shielding cover; 35, positioning pin shaft; 4, sleeve; 41, long hole; 5, self-sealing valve. Detailed Embodiments

[0022] The features and performances of the present utility model are further described in detail below in conjunction with embodiments.

[0023] The present utility model provides a rotation prevention member on the moving end cover plate, which is rotationally and guidingly cooperated with the pull rod to prevent the pull rod from rotating during the movement, so that the displacement of the pull rod can accurately represent the opening distance of the vacuum interrupter.

[0024] In Embodiment 1 of the detection device for a vacuum interrupter (hereinafter referred to as the detection device) in the present utility model:

[0025] As Figure 1 shown, in this embodiment, the detection device includes a static end cover plate 11, a moving end cover plate 13, and an insulating cylinder 12. The insulating cylinder 12 is a cylinder structure with openings at both ends. The two ends of the insulating cylinder 12 are respectively connected to the moving end cover plate 13 and the static end cover plate 11. The static end cover plate 11, the moving end cover plate 13, and the insulating cylinder 12 also form a cavity for accommodating the vacuum interrupter 2 to be detected. A sealing ring 14 is provided between the static end cover plate 11 and the insulating cylinder 12, and a sealing ring 14 is also provided between the moving end cover plate 13 and the insulating cylinder 12, so that it is convenient to form a closed space inside the insulating cylinder 12. The above-mentioned sealing rings 14 are all elastic sealing rings, and sealing is achieved during the extrusion process between the insulating cylinder 12 and the cover plate. The insulating ability of a gas is related to its density and pressure. When conducting tests, in order to improve the external insulating ability of the vacuum interrupter 2, the insulating gas inside the detection device can be pressurized, thereby enhancing the insulating ability.

[0026] A support seat 15 is provided between the vacuum interrupter 2 and the static end cover plate 11. One end is connected to the static end cover plate 11 of the detection device, and the other end is connected to the static end of the vacuum interrupter 2 during use. The end of the support seat 15 for connecting to the static end cover plate 11 is a support disc. A positioning groove for installing the support disc is provided on the static end cover plate 11. The relative position of the support seat 15 and the static end cover plate 11 is defined by the positioning groove, thereby facilitating the positioning of the vacuum interrupter 2. After the vacuum interrupter 2 is installed, the vacuum interrupter 2 is arranged coaxially with the insulating cylinder 12 as much as possible, so that the interval between the outside of the vacuum interrupter 2 and the insulating cylinder 12 is uniform, reducing the risk of breakdown. To further define the position of the support seat 15, a positioning hole is provided on the support disc, and a positioning protrusion is also provided on the static end cover plate 11. Of course, in other embodiments, a positioning hole can also be provided on one of the support disc and the static end cover plate, and a positioning protrusion can be provided on the other. The cooperation of the positioning hole and the positioning protrusion is used to complete the position positioning of the two. At this time, the positioning groove may not be provided, and the upper surface of the static end cover plate is a flat plane.

[0027] When performing a withstand voltage or partial discharge test, it is necessary to keep a gap between the static end and the moving end of the vacuum interrupter 2. Therefore, a structure for pulling the moving end of the vacuum interrupter 2 also needs to be provided. Specifically, the detection device further includes a pull rod that passes through the moving end cover plate 13 and is sealingly fitted with the moving end cover plate 13. The pull rod has an exposed section for exposing the moving end cover plate 13. The pull rod includes a smooth rod section 33 and threaded sections at both ends of the smooth rod section 33. One of the threaded sections is used for threaded connection with the moving end of the vacuum interrupter 2 to form a first threaded section 31, and the threaded section at the other end forms a second threaded section 32. The second threaded section 32 and a part of the smooth rod section 33 exposed outside the cavity together form the exposed section. The pull rod needs to pass through the moving end cover plate 13, but the cavity formed between the moving end cover plate 13, the static end cover plate 11 and the insulating cylinder 12 needs to be kept sealed. Therefore, a shaft seal 16 is installed at the part of the moving end cover plate 13 through which the pull rod passes. The shaft seal 16 is press-fitted between the moving end cover plate 13 and the pull rod, thereby achieving the seal between the pull rod and the moving end cover plate 13.

[0028] The inside of the vacuum interrupter 2 is in a negative pressure state. Therefore, an inward contracting force will be generated on the moving end of the vacuum interrupter 2, causing the moving end to be in the closed state when no external force is applied. During the test, it is necessary to keep a certain gap between the moving end and the static end of the vacuum interrupter 2. Therefore, a holding structure for keeping the moving end of the vacuum interrupter 2 in a specific position also needs to be provided. Specifically, the detection device further includes a rotation stopping member provided on the moving end cover plate 13. The rotation stopping member is a sleeve 4 with an open end at one axial end, including a limiting plate and a cylindrical side wall. The opening faces the moving end cover plate 13. A through hole for the second threaded section 32 of the exposed section to extend through is provided on the limiting plate. An adjusting nut for abutting against the limiting plate is threadedly assembled on the second threaded section 32. When the negative pressure inside the vacuum interrupter 2 acts on the moving end, the moving end of the vacuum interrupter 2 will pull the pull rod to move inward until the end of the adjusting nut assembled on the pull rod abuts against the sleeve 4. Under the action of the adjusting nut and the negative pressure inside the vacuum interrupter, the pull rod is in force balance and maintained at a specific position.

[0029] Such as Figure 2 and Figure 3As shown, a guiding structure for cooperating with the anti-rotation structure is further provided on the side wall of the sleeve 4, which extends along the length direction of the insulating cylinder 12. The guiding structure is a long hole 41, and the long hole 41 extends along the axial direction of the side wall. A positioning hole is also provided on the smooth rod section 33 of the pull rod, and the positioning hole is perpendicular to the axis of the pull rod. A stop rod is inserted into the positioning hole. Specifically, the stop rod is a positioning pin shaft 35, and the stop rod is also inserted into the long hole 41, so that the stop rod can only move along the axial direction of the insulating cylinder 12. Setting the positioning hole on the smooth rod section 33 does not affect the cooperation between the second threaded section 32 and the adjusting nut. Of course, in other embodiments, the positioning hole may not be provided, and instead, the stop rod may be directly fixed to the pull rod by means of fixed connection such as welding or bonding. Or, in other embodiments, the stop rod may not be provided on the smooth rod section of the pull rod, but on the second threaded section. At this time, the length of the second threaded section needs to be appropriately extended so that the length of the second threaded section meets the size for length adjustment in cooperation with the adjusting nut. Or, in other embodiments, the guiding structure on the sleeve may not be set as a long hole, but a guide rail may be provided on the inner wall surface of the sleeve, and the end of the stop rod is slidably arranged in the guide rail on the inner wall of the sleeve, and the anti-rotation of the pull rod is completed through the cooperation between the end of the stop rod and the guide rail.

[0030] During the testing process, a relatively high voltage level is used. To avoid the discharge of some sharp parts on the moving end, a shielding cover 34 is further provided at one end of the pull rod close to the moving end of the vacuum interrupter 2. Specifically, a through hole for the pull rod to pass through is provided on the shielding cover 34, and the diameter of the through hole on the shielding cover 34 is smaller than the diameter of the smooth rod section 33, so that when the pull rod is installed at the moving end of the vacuum interrupter 2, the shielding cover 34 can be pressed between the end face of the smooth rod section 33 of the pull rod and the moving end, thereby completing the relative fixation between the shielding cover 34 and the moving end. Of course, in other embodiments, the shielding cover may also be fixedly arranged on the smooth rod section of the pull rod, so that the shielding cover can cover the outside of the moving end of the vacuum interrupter. Specifically, the shielding cover can be welded and fixed at one end of the smooth rod section of the pull rod close to the first threaded section, so that the shielding cover can cover the outside of the moving end of the vacuum interrupter.

[0031] A valve for inflating and deflating the cavity is further provided on the moving end cover plate 13. Specifically, the valve is a self-sealing valve 5. After the inflation or deflation is completed, the self-sealing valve 5 can automatically close, which is convenient for pressurizing the inside of the insulating cylinder 12. Of course, in other embodiments, the valve may also be set as an inflation and deflation valve or an inflation structure similar to a tire inflation nozzle.

[0032] During installation, first install the support base 15 on the static end cover plate 11, then install the static end of the vacuum interrupter 2 on the support base 15, then install the pull rod and the shielding cover 34 on the moving end of the vacuum interrupter 2, then install the insulating cylinder 12 on the static end cover plate 11, then install the moving end cover plate 13 on the end of the insulating cylinder 12, and finally install the self-sealing valve 5 on the moving end cover plate 13 and place the sleeve 4 on the moving end cover plate 13 before the test. Before the test, it is necessary to fill the cavity with insulating gas. First, evacuate the cavity, then fill the insulating gas in the cavity and maintain the preset pressure.

[0033] After that, it is necessary to keep the preset opening distance between the moving end and the static end of the vacuum interrupter. Insert the positioning pin shaft 35 into the pull rod and maintain the cooperation between the positioning pin shaft 35 and the long hole 41 on the sleeve 4. Measure the distance between the end of the pull rod or the end of the positioning pin shaft 35 and the moving end cover plate 13 at this time. Rotate the adjusting nut so that the adjusting nut presses against the limiting plate of the sleeve and pull the pull rod outward until the difference between the distance of the end of the pull rod or the positioning pin shaft 35 from the moving end cover plate 13 at this time and the previous one meets the condition. Finally, connect the positive and negative poles of the power supply to the static end cover plate 11 and the moving end cover plate 13 respectively for the withstand voltage or impulse test. It should be noted that when rotating the adjusting nut, the movement of the sleeve 4 cannot be driven. In this embodiment, the friction force between the sleeve and the moving end cover plate is controlled to be sufficient to prevent rotation. Of course, in other embodiments, the sleeve can also be kept stationary by manual pressing.

[0034] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A detection device for a vacuum interrupter, comprising a cavity assembled by an insulating cylinder, a moving end cover plate and a stationary end cover plate for accommodating a vacuum interrupter to be detected, and also comprising a pull rod penetrating the moving end cover plate and sealingly cooperating with the moving end cover plate, the pull rod having an exposed section exposed from the cavity, characterized in that: The detection device of the vacuum arc extinguishing chamber also includes a stopper arranged on the moving end cover plate, a stopper structure is arranged on the pull rod and cooperates with the stopper along the axis of the insulating cylinder, and a guide structure is arranged on the stopper and extends along the length direction of the insulating cylinder and is used to cooperate with the stopper structure.

2. The detection device for a vacuum interrupter according to claim 1, characterized in that: The anti-rotation member is a sleeve with an open axial end, a limit plate is arranged at the end of the sleeve away from the movable end cover plate, and an adjusting nut is threadedly assembled on the exposed section and is stopped outside the limit plate.

3. The detection device for a vacuum interrupter according to claim 2, characterized in that: The guide structure is a long hole provided on the side wall of the sleeve for the anti-rotation member to be inserted into.

4. The detection device for a vacuum interrupter according to any one of claims 1 to 3, characterized in that: The anti-rotation structure is an anti-rotation rod arranged perpendicular to the axis of the pull rod, and the anti-rotation rod cooperates with the guide structure during the axial movement of the pull rod.

5. The detection device for a vacuum interrupter according to claim 4, characterized in that: The pull rod is provided with a positioning hole which is perpendicular to the axis of the pull rod, and the anti-rotation rod is inserted and fixed in the positioning hole.

6. The detection device for a vacuum interrupter according to claim 5, characterized in that: The pull rod comprises a polished rod section in the middle and threaded sections at both ends of the polished rod section, and the positioning hole is arranged at one end of the polished rod section.

7. The detection device for a vacuum interrupter according to any one of claims 1 to 3, characterized in that: A shielding cover is also provided at one end of the pull rod close to the movable end.

8. The detection device for a vacuum interrupter according to claim 7, characterized in that: The pull rod includes a middle bare rod section and a threaded section for connecting the moving end of the vacuum arc extinguishing chamber. The shielding cover has a through hole for the pull rod to pass through. The diameter of the through hole is larger than the diameter of the threaded section and smaller than the diameter of the bare rod section so that the shielding cover is clamped between the end face of the bare rod section and the moving end.

9. The detection device for a vacuum interrupter according to any one of claims 1 to 3, characterized in that: The movable end cover plate is also provided with a valve for inflation and deflation.

10. The detection device for a vacuum interrupter according to any one of claims 1 to 3, characterized in that: The static end cover plate is fixedly provided with a support seat for fixing the vacuum arc extinguishing chamber to be tested, and a positioning groove for positioning and installing the support seat is provided on the static end cover plate, and the positioning groove is adapted to the bottom surface of the support seat.

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