A vacuum interrupter capable of withstanding high pressure

Abstract

The invention discloses a vacuum arc extinguishing chamber capable of withstanding high air pressure, and belongs to the technical field of vacuum arc extinguishing chambers. The invention comprises a porcelain shell, a static conductive rod, a dynamic conductive rod, a self-guided bellows, a protective cover and a shielding tube. The static conductive rod and the dynamic conductive rod are respectively mounted at two ends of the porcelain shell, the self-guided bellows is mounted on the outside of the dynamic conductive rod, the outer peripheral surface of the dynamic conductive rod is equipped with a protective cover, and the self-guided bellows is located inside the protective cover, and the shielding tube is mounted inside the porcelain shell. The invention designs the bellows in the vacuum arc extinguishing chamber, which is composed of an inner bellows, a middle bellows and an outer bellows which are sequentially sleeved. The design of the wave crests and troughs increases the radius of the wave crests and troughs relative to the design of the ordinary "S"-shaped waveform, and effectively improves the fatigue strength of the wave crests and troughs of the bellows. At the same time, a buffer body is arranged in adjacent wave crests or troughs to further protect the wave crests and troughs, thereby increasing their service life, thereby increasing the service life of the vacuum arc extinguishing chamber.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum interrupter chambers, and in particular provides a vacuum interrupter chamber capable of withstanding high gas pressure. Background Art

[0002] The ability of vacuum interrupters produced by existing technology to withstand gas pressure depends on the bellows. The gas pressure withstood by traditional bellows is generally less than 0.2MPa (relative). This brings inconvenience to the design of environmentally friendly switches and environmentally friendly switch complete sets, reducing their reliability.

[0003] One of the existing solutions is to design a multi-layer bellows. One design method is to install multiple bellows in parallel from the inside to the outside, without interfering with each other, and the bellows are filled with gases of different pressures in a step-by-step manner. However, this method will greatly increase the space occupied by the bellows, which will in turn increase the volume of the vacuum arc extinguishing chamber, which is not in line with the current miniaturization design concept; another design method is to connect multiple bellows in sequence. Although the space occupied is reduced compared to the first method, due to factors such as the wall thickness of the bellows themselves, adjacent bellows are prone to interference or even damage during the compression process of the bellows.

[0004] Therefore, there is a need for a vacuum interrupter that can withstand high gas pressure and avoid interference and wear of adjacent bellows. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a vacuum interrupter capable of withstanding high gas pressure.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a vacuum interrupter chamber capable of withstanding high gas pressure, comprising a porcelain shell, a static conductive rod, a dynamic conductive rod, a self-guided bellows, a protective cover and a shielding cylinder, wherein the static conductive rod and the dynamic conductive rod are respectively mounted at two ends of the porcelain shell, the self-guided bellows is mounted on the outside of the dynamic conductive rod, the outer circumference of the dynamic conductive rod is equipped with a protective cover, and the self-guided bellows is located in the protective cover, and the shielding cylinder is mounted inside the porcelain shell;

[0007] The self-guided bellows comprises a bellows group and a guide structure, wherein the guide structure is assembled between adjacent bellows groups;

[0008] The bellows group includes an inner bellows, a middle bellows, an outer bellows and an end plate, the crest radius of the inner bellows, the middle bellows and the outer bellows increases in sequence, and the trough radius of the inner bellows, the middle bellows and the outer bellows decreases in sequence, the crest radius of the middle bellows is the same as the trough radius, the crest cross-sections of the inner bellows, the middle bellows and the outer bellows are not concentric circles, the inner bellows, the middle bellows and the outer bellows are filled with gas, the pressures of the air inside the inner bellows, the gas between the inner bellows and the middle bellows, the gas between the middle bellows and the outer bellows, and the vacuum environment outside the outer bellows vary arbitrarily, and the end plate is welded to the ends of the inner bellows, the middle bellows and the outer bellows.

[0009] Furthermore, buffer bodies are filled between the wave crests of the inner bellows, the middle bellows and the outer bellows.

[0010] Furthermore, the guide structure includes a support ring and a guide ring, the end plate at the inner end of the self-guided bellows is welded to the support ring, and the inner circumference of the support ring is equipped with the guide ring.

[0011] Furthermore, an annular groove is provided on the outer circumference of the bracket ring, an auxiliary cover body is assembled in the annular groove, a guide plate is fixedly installed on the inner surface of the auxiliary cover body, a guide cover is fixedly installed on the upper end of the protective cover, and a slot is provided on the outer circumference of the guide cover, and the guide plate is inserted into the slot.

[0012] Furthermore, it also includes a movable sleeve, and the inner circumference of the guide ring is evenly equipped with the movable sleeve, the upper and lower surfaces of the guide ring are symmetrically provided with sliding grooves, and the inner end of the sliding groove is provided with a clamping groove, and the inner circumference of the guide ring is evenly provided with cylindrical grooves, and a disc spring is installed in the cylindrical groove;

[0013] The cross-sectional shape of the movable sleeve is C-shaped, a pressure block matching the cylindrical groove is fixedly installed in the middle of the inner surface of the movable sleeve, and the pressure block is inserted in the cylindrical groove, and clamping blocks are symmetrically fixedly installed at the upper and lower ends of the inner surface of the movable sleeve, and the clamping blocks are inserted in the clamping groove.

[0014] Furthermore, protrusions are integrally formed on the outer sides of both ends of the movable sleeve.

[0015] Furthermore, an auxiliary protective cover is vertically welded to the upper end of the outer circumference of the protective cover, the auxiliary protective cover is bent downward with the inner end facing the protective cover, a protrusion is fixedly installed on the inner end of the auxiliary protective cover, and a protective cover outer cylinder is fixedly installed on the outer circumference of the protective cover.

[0016] Furthermore, a mounting ring is installed at the inner end of the outer surface of the moving conductive rod, a bellows mounting cylinder is fixedly installed on the outer surface of the mounting ring, the end plate at the lower end of the self-guiding bellows is welded to the bellows mounting cylinder, and an inner support plate is evenly fixedly installed on the inner surface of the bellows mounting cylinder.

[0017] Furthermore, a guide sleeve is sleeved on the moving conductive rod, an end plate at the upper end of the self-guiding bellows is welded to the guide sleeve, an air vent is opened on the upper surface of the guide sleeve, and the air vent is connected to the interior of the inner bellows.

[0018] The beneficial effects of using the present invention are:

[0019] The present invention designs a bellows in a vacuum arc extinguishing chamber, which is composed of an inner bellows, a middle bellows and an outer bellows which are sequentially socketed. The structure of the crests and troughs of the bellows is designed. Compared with the usual "S"-shaped waveform design, the radius of the crests and troughs is increased, which can effectively improve the fatigue strength of the crests and troughs of the bellows, increase its service life, and thus increase the service life of the vacuum arc extinguishing chamber.

[0020] The cross-sectional figures of the crests and troughs of the inner bellows, the middle bellows and the outer bellows are not concentric circles, and the crests or troughs with larger radii are farther in relative position, which can avoid interference and contact between adjacent bellows during the compression process of the bellows. At the same time, buffer bodies are arranged in adjacent crests or troughs to further protect the crests and troughs and increase their service life.

[0021] The present invention also designs a guide structure to ensure the stability of the bellows and prevent the bellows from deforming during movement or under the action of gravity, which would affect the sealing and movement performance. At the same time, the design of the disc spring and the movable sleeve can reset the bellows when it becomes unstable, thereby ensuring its stability.

[0022] The present invention designs the protective cover and adds an auxiliary protective cover. The orientation of the end portion and the design of the protrusion make the electric field and magnetic field here larger, which can effectively avoid the large electric field or magnetic field acting on the bellows and effectively protect the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0024] Figure 2 It is a front cross-sectional view of the present invention.

[0025] Figure 3 For the present invention Figure 2 A partial enlarged view of part a.

[0026] Figure 4 For the present invention Figure 2A partial enlarged view of part b.

[0027] Figure 5 For the present invention Figure 2 A partial enlarged view of part c.

[0028] Figure 6 It is a distribution diagram of the movable sleeve on the guide ring of the present invention.

[0029] Figure 7 It is a schematic diagram of the center position of the cross section of the wave crest of the inner bellows, the middle bellows and the outer bellows of the present invention.

[0030] The reference numerals include: 1, porcelain shell, 2, static conductive rod, 3, dynamic conductive rod, 4, bellows group, 401, inner bellows, 402, middle bellows, 403, outer bellows, 404, buffer body, 405, end plate, 5, guide structure, 501, bracket ring, 5011, annular groove, 5012, auxiliary cover body, 5013, guide plate, 502, guide ring, 5021, slide groove, 5022, Disc spring, 503, movable sleeve, 5031, pressure block, 5032, clamping block, 6, protective cover, 601, protective cover outer tube, 7, auxiliary protective cover, 701, protrusion, 8, guide cover, 9, shielding tube, 10, guide sleeve, 1001, vent, 11, mounting ring, 12, bellows mounting tube, 13, inner support plate, 14, pressure plate, 15, dynamic cover plate, 16, static cover plate, 17, sealing ring. DETAILED DESCRIPTION

[0031] 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. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figure 1 and Figure 2 A vacuum interrupter capable of withstanding high pressure comprises a porcelain shell 1, a static conductive rod 2, a dynamic conductive rod 3, a self-guided bellows, a protective cover 6 and a shielding tube 9. The static conductive rod 2 and the dynamic conductive rod 3 are respectively mounted at two ends of the porcelain shell 1, the self-guided bellows is mounted on the outside of the dynamic conductive rod 3, the outer circumferential surface of the dynamic conductive rod 3 is equipped with a protective cover 6, and the self-guided bellows is located in the protective cover 6, and the shielding tube 9 is mounted inside the porcelain shell 1.

[0033] A moving cover plate 15 and a static cover plate 16 are respectively installed at the upper and lower ends of the vacuum arc extinguishing chamber, a pressure plate 14 is arranged at the upper end, and a guide sleeve 10 is arranged between the pressure plate 14 and the moving cover plate 15 to guide the movement of the moving conductive rod 3. The static cover plate 16 is installed on the static conductive rod 2. Sealing rings 17 are arranged between the moving cover plate 15 and the porcelain shell 1 and between the static cover plate 16 and the porcelain shell 1 to ensure the sealing of the vacuum arc extinguishing chamber.

[0034] The self-guided bellows comprises a bellows group 4 and a guide structure 5 , wherein the guide structure 5 is assembled between adjacent bellows groups 4 .

[0035] The guide structure 5 is designed to support and stabilize the bellows group 4 .

[0036] like Figure 3 and Figure 7 As shown, the bellows group 4 includes an inner bellows 401, a middle bellows 402, an outer bellows 403 and an end plate 405. The crest radius of the inner bellows 401, the middle bellows 402 and the outer bellows 403 increases in sequence, and the trough radius of the inner bellows 401, the middle bellows 402 and the outer bellows 403 decreases in sequence. The crest radius of the middle bellows 402 is the same as the trough radius. The peak cross section is not a concentric circle, and gas is filled between the inner bellows 401, the middle bellows 402, and the outer bellows 403. The pressures of the air inside the inner bellows 401, the gas between the inner bellows 401 and the middle bellows 402, the gas between the middle bellows 402 and the outer bellows 403, and the vacuum environment outside the outer bellows 403 vary arbitrarily. The end plate 405 is welded to the ends of the inner bellows 401, the middle bellows 402, and the outer bellows 403.

[0037] The crest radius of the inner bellows 401, the middle bellows 402, and the outer bellows 403 increases in sequence, and the trough radius of the inner bellows 401, the middle bellows 402, and the outer bellows 403 decreases in sequence, wherein the crest is the position where the outer side of the bellows is bent, and the trough is the position where the inner side of the bellows is bent. Figure 3 That is, the left arc position of the bellows is the wave crest, and the right arc position is the wave trough.

[0038] The inner bellows 401, the middle bellows 402 and the outer bellows 403 are sleeved to form a self-guiding bellows, and the internal gas pressure varies arithmetically, so that the internal and external pressure difference of each bellows is small, thereby enabling the self-guiding bellows to withstand higher gas pressure, thereby increasing its application range and service life.

[0039] The radii of the crests and troughs of the inner bellows 401, the middle bellows 402 and the outer bellows 403 are designed, and the spacing of the horizontal sections of the inner bellows 401 is greater than or equal to the diameter of the crests of the middle bellows 402, so that the three can be connected in sequence, reducing the space occupied by the self-guided bellows.

[0040] The structure of the crests and troughs composed of the inner bellows 401, the middle bellows 402, and the outer bellows 403 which are sequentially socketed is designed. Compared with the usual "S"-shaped waveform design, the radius of the crests and troughs is increased, which can effectively improve the fatigue strength of the crests and troughs of the bellows, increase its service life, and thus increase the service life of the vacuum arc chamber.

[0041] A sealing gasket is installed inside the end plate 405 to ensure the sealing of the space between the inner bellows 401 , the middle bellows 402 , and the outer bellows 403 .

[0042] like Figure 7 As shown, the cross-sectional figures of the crests and troughs of the inner bellows 401, the middle bellows 402 and the outer bellows 403 are not concentric circles, and the crests or troughs with larger radii are farther apart in relative position, so that adjacent crests or troughs form a shape that is wide in the middle and narrow on both sides. During the compression process of the bellows, interference and contact between adjacent bellows can be avoided, wear between the bellows can be avoided, and the service life of the bellows can be increased.

[0043] The design of the inner bellows 401, the middle bellows 402, and the outer bellows 403 allows them to occupy a smaller space overall and can be used in the process of miniaturizing the vacuum interrupter.

[0044] Specifically, the buffer bodies 404 are filled between the wave crests of the inner bellows 401 , the middle bellows 402 , and the outer bellows 403 .

[0045] The buffer body 404 is mainly made of breathable and soft materials such as sponge, which will not affect the expansion and contraction of the bellows and the flow of gas, while protecting the wave crests and troughs to increase its service life.

[0046] When assembling the self-guided bellows, first place the buffer body 404 inside the trough of the inner bellows 401 and the crest of the middle bellows 402, put the middle bellows 402 inside the inner bellows 401, and then install the outer bellows 403 in the same way. Then, weld the end plate 405 at one end of the bellows group, and weld the end plate 405 after filling the other end with gas of set pressure to complete the sealing between the inner bellows 401, the middle bellows 402, and the outer bellows 403.

[0047] Specifically, if Figure 3As shown, the guide structure 5 includes a support ring 501 and a guide ring 502 . The end plate 405 at the inner end of the self-guided bellows is welded to the support ring 501 , and the inner circumference of the support ring 501 is equipped with the guide ring 502 .

[0048] When the self-guided bellows is long, in order to reduce the deformation of the bellows, the bellows can be designed into multiple groups and connected by the guide structure 5. In this embodiment, the bellows are divided into two groups.

[0049] Specifically, if Figure 3 As shown, an annular groove 5011 is provided on the outer circumference of the bracket ring 501, an auxiliary cover body 5012 is assembled in the annular groove 5011, a guide plate 5013 is fixedly installed on the inner surface of the auxiliary cover body 5012, a guide cover 8 is fixedly installed on the upper end of the protective cover 6, and a slot is provided on the outer circumference of the guide cover 8, and the guide plate 5013 is inserted into the slot.

[0050] The auxiliary cover body 5012, the protective cover 6 and the guide cover 8 form an outer cover structure of the bellows, which can effectively prevent arc products from splashing onto the bellows.

[0051] The auxiliary cover body 5012 is on the outside of the guide cover 8, and the two do not interfere with each other and will not affect the expansion and contraction of the bellows.

[0052] The guide cover 8 is a porcelain cover, and the guide plate 5013 is inserted into the slot, which can effectively limit the position of the bracket ring 501 and effectively prevent the bellows from being twisted and damaged during use, thereby ensuring the stability of the bellows at both ends of the bracket ring 501.

[0053] Specifically, if Figure 3 and Figure 6 As shown, it also includes a movable sleeve 503, and the inner circumference of the guide ring 502 is evenly equipped with the movable sleeve 503, the upper and lower surfaces of the guide ring 502 are symmetrically provided with sliding grooves 5021, and the inner end of the sliding groove 5021 is provided with a clamping groove, the inner circumference of the guide ring 502 is evenly provided with cylindrical grooves, and a disc spring 5022 is installed in the cylindrical groove.

[0054] The cross-sectional shape of the movable sleeve 503 is C-shaped, a pressure block 5031 matching the cylindrical groove is fixedly installed in the middle of the inner surface of the movable sleeve 503, and the pressure block 5031 is inserted into the cylindrical groove, and clamping blocks 5032 are symmetrically fixedly installed at the upper and lower ends of the inner surface of the movable sleeve 503, and the clamping block 5032 is inserted into the clamping groove.

[0055] The movable sleeve 503 is made of insulating material. The clamping block 5032 is clamped in the clamping slot after passing through the sliding slot 5021. When the clamping block 5032 is located in the clamping slot, the disc spring 5022 is in a slightly compressed state.

[0056] The inner end of the movable sleeve 503 is close to the dynamic conductive rod 3. When the bellows becomes unstable, the movable sleeve 503 will contact the dynamic conductive rod 3 and compress the disc spring 5022, and then reset under the elastic force of the disc spring 5022, thereby preventing the bellows from becoming unstable.

[0057] The structure of the guide ring 502 and the movable sleeve 503 and the structure of the guide plate 5013 and the slot on the guide cover 8 can be used either alone or both at the same time, and both are used to ensure the stability of the bellows during the expansion and contraction process.

[0058] Specifically, if Figure 3 As shown, protrusions are integrally formed on the outer sides of both ends of the movable sleeve 503.

[0059] It is convenient to apply outward force to the two ends of the movable sleeve 503 so that the clamping block 5032 is moved out of the clamping slot.

[0060] Specifically, if Figure 2 and Figure 4 As shown, an auxiliary protective cover 7 is vertically welded to the upper end of the outer peripheral surface of the protective cover 6. The auxiliary protective cover 7 is bent downward with the inner end facing the protective cover 6. A protrusion 701 is fixedly installed on the inner end of the auxiliary protective cover 7. A protective cover outer cylinder 601 is fixedly installed on the outer peripheral surface of the protective cover 6.

[0061] The design of the auxiliary protective cover 7 will make the electric field and magnetic field at the protrusion 701 larger, which can effectively avoid the large electric field or magnetic field acting on the bellows and play an effective protective role for the bellows.

[0062] Specifically, if Figure 2 and Figure 4 As shown, the inner end of the outer surface of the moving conductive rod is equipped with a mounting ring 11, the outer surface of the mounting ring 11 is fixedly mounted with a bellows mounting cylinder 12, the end plate 405 at the lower end of the self-guided bellows is welded to the bellows mounting cylinder 12, and the inner surface of the bellows mounting cylinder 12 is evenly fixedly mounted with an inner support plate 13.

[0063] Specifically, if Figure 2 and Figure 5 As shown, a guide sleeve 10 is sleeved on the moving conductive rod 3, and the end plate 405 at the upper end of the self-guide bellows is welded to the guide sleeve 10. A vent hole 1001 is opened on the upper surface of the guide sleeve 10, and the vent hole 1001 is connected to the interior of the inner bellows 401.

[0064] The inner bellows 405 is connected to the external space so that the gas inside is at normal atmospheric pressure.

[0065] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A vacuum interrupter capable of withstanding high pressure, characterized in that: It includes a porcelain shell, a static conductive rod, a dynamic conductive rod, a self-guided bellows, a protective cover and a shielding cylinder. The static conductive rod and the dynamic conductive rod are respectively mounted on both ends of the porcelain shell, the self-guided bellows is mounted on the outside of the dynamic conductive rod, the outer circumference of the dynamic conductive rod is equipped with a protective cover, and the self-guided bellows is located in the protective cover, and the shielding cylinder is mounted inside the porcelain shell; The self-guided bellows comprises a bellows group and a guide structure, wherein the guide structure is assembled between adjacent bellows groups; The bellows group includes an inner bellows, a middle bellows, an outer bellows and an end plate, the crest radius of the inner bellows, the middle bellows and the outer bellows increases in sequence, and the trough radius of the inner bellows, the middle bellows and the outer bellows decreases in sequence, the crest radius of the middle bellows is the same as the trough radius, the crest cross-sections of the inner bellows, the middle bellows and the outer bellows are not concentric circles, the inner bellows, the middle bellows and the outer bellows are filled with gas, the pressures of the air inside the inner bellows, the gas between the inner bellows and the middle bellows, the gas between the middle bellows and the outer bellows, and the vacuum environment outside the outer bellows vary arbitrarily, and the end plate is welded to the ends of the inner bellows, the middle bellows and the outer bellows.

2. A vacuum interrupter capable of withstanding high pressure according to claim 1, characterized in that: Buffer bodies are filled between the wave crests of the inner bellows, the middle bellows and the outer bellows.

3. A vacuum interrupter capable of withstanding high pressure according to claim 1, characterized in that: The guide structure comprises a support ring and a guide ring. The end plate at the inner end of the self-guided bellows is welded to the support ring. The inner circumference of the support ring is equipped with the guide ring.

4. A vacuum interrupter capable of withstanding high pressure according to claim 3, characterized in that: The outer circumference of the bracket ring is provided with an annular groove, an auxiliary cover body is installed in the annular groove, a guide plate is fixedly installed on the inner surface of the auxiliary cover body, a guide cover is fixedly installed on the upper end of the protective cover, and a slot is provided on the outer circumference of the guide cover, and the guide plate is inserted into the slot.

5. A vacuum interrupter capable of withstanding high pressure according to claim 3, characterized in that: It also includes a movable sleeve, and the inner circumference of the guide ring is evenly equipped with the movable sleeve, the upper and lower surfaces of the guide ring are symmetrically provided with sliding grooves, and the inner end of the sliding groove is provided with a clamping groove, and the inner circumference of the guide ring is evenly provided with cylindrical grooves, and a disc spring is installed in the cylindrical groove; The cross-sectional shape of the movable sleeve is C-shaped, a pressure block matching the cylindrical groove is fixedly installed in the middle of the inner surface of the movable sleeve, and the pressure block is inserted in the cylindrical groove, and clamping blocks are symmetrically fixedly installed at the upper and lower ends of the inner surface of the movable sleeve, and the clamping blocks are inserted in the clamping groove.

6. A vacuum interrupter capable of withstanding high pressure according to claim 5, characterized in that: Both ends of the movable sleeve are integrally formed with protrusions on the outer sides.

7. A vacuum interrupter capable of withstanding high pressure according to claim 1, characterized in that: An auxiliary protective cover is vertically welded to the upper end of the outer peripheral surface of the protective cover. The auxiliary protective cover is bent downward with the inner end facing the protective cover. A protrusion is fixedly installed on the inner end of the auxiliary protective cover. A protective cover outer cylinder is fixedly installed on the outer peripheral surface of the protective cover.

8. A vacuum interrupter capable of withstanding high pressure according to claim 1, characterized in that: The inner end of the outer surface of the moving conductive rod is equipped with a mounting ring, the outer surface of the mounting ring is fixedly mounted with a bellows mounting cylinder, the end plate at the lower end of the self-guided bellows is welded to the bellows mounting cylinder, and the inner surface of the bellows mounting cylinder is evenly fixedly mounted with an inner support plate.

9. A vacuum interrupter capable of withstanding high pressure according to claim 1, characterized in that: A guide sleeve is sleeved on the moving conductive rod, an end plate at the upper end of the self-guided corrugated pipe is welded to the guide sleeve, an air vent is opened on the upper surface of the guide sleeve, and the air vent is communicated with the interior of the inner corrugated pipe.

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