Guide assembly, corrugated pipe assembly, vacuum arc-extinguishing chamber and high-voltage switch

Abstract

The invention relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a guide assembly, a corrugated pipe assembly, a vacuum arc extinguishing chamber and a high-voltage switch. The guiding assembly comprises a guiding lantern ring, the guiding lantern ring is used for being connected with the inner wall of the corrugated pipe in a matched mode, the guiding lantern ring is connected with a plurality of guiding structures, the guiding structures are annularly arrayed along the inner circumferential face of the guiding lantern ring and extend towards the circle center in the radial direction of the guiding lantern ring, and the guiding structures are used for being in contact fit with a contact rod of a moving contact. A space formed between the guide lantern ring and any two adjacent guide structures forms a gas escape space; according to the guide assembly, in the high-speed moving process of the corrugated pipe, compressed gas can escape along the gas escape space, the situation that local pressure borne by the corrugated pipe is too large is avoided, gas compression counterforce can act on the corrugated pipe relatively uniformly, and the situation that the corrugated pipe deforms or leaks gas due to the too large local pressure is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage or high-current switches with arc extinguishing or arc protection devices, and in particular to a guide assembly, a bellows assembly, a vacuum interrupter and a high-voltage switch. Background Art

[0002] In the power system, vacuum circuit breakers are commonly used key equipment to ensure the safe and stable operation of the power grid. As the core component of vacuum circuit breakers, vacuum interrupters have excellent insulation and arc extinguishing performance. They are mainly composed of moving and static contacts, moving and static conductive rods, bellows, shielding covers, glass shells and other components. Bellows is a key protective device in vacuum interrupters, which can ensure the reliable operation of circuits under high voltage environments. Figure 1 The bellows has a wavy structure and can be sealed and connected with the moving conductive rod to form a movable part. When the operating mechanism drives the moving conductive rod to move along the axial direction of the arc extinguishing chamber, the bellows will expand and contract accordingly, driving the moving contact of the arc extinguishing chamber to complete the opening and closing actions. The bellows can maintain the sealed state of the vacuum arc extinguishing chamber to prevent external gas from entering and affecting the arc extinguishing performance. At the same time, the wavy structure of the bellows gives it a certain elastic deformation ability. When the bellows is subjected to internal pressure, it will undergo elastic deformation to relieve the pressure. However, when the bellows is under a large pressure or the displacement is too large, due to the sudden change in shape, stress concentration will cause the bellows to undergo plastic deformation, which will then cause columnar instability. The specific state of columnar instability can be found in Figure 2 .

[0003] In response to the above problems, a Chinese utility model patent with authorization announcement number CN218299702U and authorization announcement date 2023.01.13 discloses a structure to prevent the instability of the vacuum arc chamber bellows, the structure including a moving end cover plate, a moving conductive rod, a bellows group and two guide sleeves. The bellows group is composed of multiple shorter bellows welded together by argon arc welding or plasma welding. A center hole is provided on the moving end cover plate, and the moving conductive rod is movably connected in the center hole. The bellows group is sleeved on the outer periphery of the moving conductive rod, one end of which is fixedly connected to the moving end cover plate by a welding ring, and the other end is fixedly connected to the moving conductive rod by a welding ring. The two guide sleeves are respectively fixed at the center hole and the outer periphery of the moving conductive rod close to the contact end, and the bellows is guided by a two-stage guide sleeve.

[0004] There is no space for accommodating gas and flowing gas between the guide sleeve and the moving conductive rod in the above scheme. When the bellows moves at high speed along with the moving conductive rod, the compressed gas in the bellows cannot flow, and the compressed gas will be sealed in the gap between the bellows group and the guide sleeve. At the same time, the bellows is always subjected to a large gas compression reaction force. Since the bellows group is elastic, the gas compression reaction force will act on the bellows group, causing the bellows group to deform, resulting in a reduction in the service life of the bellows group. In particular, the two guide sleeves are not connected, and the middle part of the bellows group is not guided by the guide sleeve. The compressed gas will first act on the middle part of the bellows group. Due to the large local pressure, over time, the middle part of the bellows group may leak, resulting in the scrapping of the bellows group, and then resulting in reduced stability and reliability of the vacuum arc chamber, affecting the normal operation of the high-voltage switch. Summary of the invention

[0005] The object of the present invention is to provide a guide assembly, which aims to solve the problem that there is not enough gas flow space inside the bellows group, and the compressed gas causes the bellows group to deform or leak. At the same time, the object of the present invention is also to provide a bellows assembly, which solves the problem of reduced service life of the bellows group by connecting the guide assembly inside the bellows. At the same time, the object of the present invention is also to provide a vacuum interrupter, which solves the problem of reduced stability and reliability of the vacuum interrupter by using the bellows assembly. At the same time, the object of the present invention is also to provide a high-voltage switch, which solves the problem of affecting the normal operation of the high-voltage switch by using the vacuum interrupter.

[0006] To achieve the above purpose, the guide assembly of the present invention adopts the following technical solutions: A guide assembly comprises a guide collar, which is used for being connected with the inner wall of a bellows, and is connected with a plurality of guide structures, which are arranged in an annular array along the inner circumference of the guide collar and extend toward the center of a circle along the radial direction of the guide collar, and the guide structures are used for being contacted and matched with the contact rod of a moving contact, and the space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

[0007] Furthermore, the guide structure includes an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

[0008] Furthermore, the guide arc plate is arranged along the axial direction of the guide collar and its end portion extends beyond the inner extension arm, and the guide arc plate is used for contacting and cooperating with the outer peripheral surface of the moving contact.

[0009] Furthermore, the guide collar, the inner extension arm and the guide arc plate together constitute a guide assembly, and the guide assembly is integrally formed and processed.

[0010] Beneficial effects: The guide assembly of the present invention is an improved invention. By connecting the guide collar to the inner wall of the bellows and setting a guide structure on the inner circumference of the guide collar, the bellows and the moving contact are guided together by the contact and cooperation between the guide structure and the moving contact; the guide structure annular array is set on the inner circumference of the guide collar so that there is a spacing between two adjacent guide structures, and a gas escape space is formed between the guide collar and any two adjacent guide structures. Then, during the high-speed movement of the bellows, the compressed gas will escape along the gas escape space, avoiding excessive local pressure on the bellows, and the gas compression reaction force can act relatively evenly on the bellows, avoiding deformation or leakage of the bellows due to excessive local pressure.

[0011] The bellows assembly of the present invention adopts the following technical solutions: A bellows assembly comprises a bellows and a guide assembly, wherein the guide assembly comprises a guide collar, which is used to cooperate with the inner wall of the bellows, and is connected to a plurality of guide structures, which are arranged in an annular array along the inner circumference of the guide collar and extend toward the center of a circle along the radial direction of the guide collar, and the guide structures are used to contact and cooperate with the contact rod of the moving contact, and the space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

[0012] Furthermore, the guide structure includes an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

[0013] Furthermore, the guide assembly is used to be pre-set in the corrugated pipe and to be integrally formed with the corrugated pipe.

[0014] Furthermore, the guide assembly is clamped between two adjacent corrugated pipes and fixed to the two corrugated pipes by welding.

[0015] Beneficial effects: The bellows assembly of the present invention is an improved invention. By connecting the guide collar to the inner wall of the bellows and setting a guide structure on the inner circumference of the guide collar, the bellows and the moving contact are guided together by the contact and cooperation between the guide structure and the moving contact; the guide structure annular array is set on the inner circumference of the guide collar, so that there is a spacing between two adjacent guide structures, and a gas escape space is formed between the guide collar and any two adjacent guide structures. Then, during the high-speed movement of the bellows, the compressed gas will escape along the gas escape space, avoiding excessive local pressure on the bellows, and the gas compression reaction force can act on the bellows relatively evenly, avoiding the bellows from deformation or leakage due to excessive local pressure, thereby extending the working life of the bellows.

[0016] The vacuum interrupter of the present invention adopts the following technical solutions: A vacuum arc extinguishing chamber includes a moving contact and a bellows assembly, wherein the bellows assembly is sleeved on the outer circumferential surface of the moving contact; a bellows assembly includes a bellows and a guide assembly, wherein the guide assembly includes a guide collar, wherein the guide collar is used for being connected with the inner wall of the bellows, wherein the guide collar is connected with a plurality of guide structures, wherein the plurality of guide structures are arranged in an annular array along the inner circumferential surface of the guide collar and extend toward the center of a circle along the radial direction of the guide collar, wherein the guide structures are used for contacting and matching with the contact rod of the moving contact, and the space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

[0017] Furthermore, the guide structure includes an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

[0018] Furthermore, the guide assembly is used to be pre-set in the corrugated pipe and to be integrally formed with the corrugated pipe.

[0019] Furthermore, the guide assembly is clamped between two adjacent corrugated pipes and fixed to the two corrugated pipes by welding.

[0020] Beneficial effects: The vacuum interrupter of the present invention is an improved invention. By connecting the guide ring to the inner wall of the bellows and arranging a guide structure on the inner circumference of the guide ring, the bellows and the moving contact are guided together through the contact and cooperation between the guide structure and the moving contact; the guide structure annular array is arranged on the inner circumference of the guide ring, so that there is a spacing between two adjacent guide structures, and a gas escape space is formed between the guide ring and any two adjacent guide structures. Then, during the high-speed movement of the bellows, the compressed gas will escape along the gas escape space, avoiding excessive local pressure on the bellows, and the gas compression reaction force can act relatively evenly on the bellows, avoiding deformation or gas leakage of the bellows due to excessive local pressure, extending the working life of the bellows, and improving the stability and reliability of the vacuum interrupter.

[0021] The high voltage switch of the present invention adopts the following technical solutions: A high-voltage switch includes a vacuum interrupter; the vacuum interrupter includes a moving contact and a bellows assembly, the bellows assembly is sleeved on the outer circumferential surface of the moving contact; the bellows assembly includes a bellows and a guide assembly, the guide assembly includes a guide collar, the guide collar is used to be connected with the inner wall of the bellows, the guide collar is connected with a plurality of guide structures, the plurality of guide structures are arranged in an annular array along the inner circumferential surface of the guide collar and extend toward the center of the circle along the radial direction of the guide collar, the guide structure is used to contact and cooperate with the contact rod of the moving contact, and the space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

[0022] Furthermore, the guide structure includes an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

[0023] Furthermore, the guide assembly is used to be pre-set in the corrugated pipe and to be integrally formed with the corrugated pipe.

[0024] Furthermore, the guide assembly is clamped between two adjacent corrugated pipes and fixed to the two corrugated pipes by welding.

[0025] Beneficial effects: The high-voltage switch of the present invention is an improved invention. By connecting the guide ring to the inner wall of the bellows and setting a guide structure on the inner circumference of the guide ring, the bellows and the moving contact are guided together through the contact and cooperation between the guide structure and the moving contact; the guide structure annular array is set on the inner circumference of the guide ring, so that there is a spacing between two adjacent guide structures, and a gas escape space is formed between the guide ring and any two adjacent guide structures. Then, during the high-speed movement of the bellows, the compressed gas will escape along the gas escape space, avoiding excessive local pressure on the bellows, and the gas compression reaction force can act relatively evenly on the bellows, avoiding deformation or leakage of the bellows due to excessive local pressure, extending the working life of the bellows, improving the stability and reliability of the vacuum interrupter, and ensuring the normal operation of the high-voltage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the bellows of the present invention; Figure 2 It is a schematic diagram of the structure of the bellows of the present invention when columnar instability occurs; Figure 3 is a schematic cross-sectional structural diagram of an embodiment of a guide assembly of the present invention; Figure 4 A schematic diagram of a top view of a guide assembly according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of an embodiment of a bellows assembly of the present invention; Figure 6 It is a schematic structural diagram of a vacuum interrupter of an embodiment of the present invention.

[0027] In the figure: 1. Guide assembly; 2. Guide sleeve; 3. Bellows; 4. Guide structure; 5. Moving contact; 6. Gas escape space; 7. Inner extension arm; 8. Guide arc plate; 9. Moving end cover plate; 10. Vacuum arc extinguishing chamber. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] When the bellows expands and contracts with the moving conductive rod, it can drive the moving contact to complete the opening and closing actions, ensuring the sealing insulation performance and arc extinguishing performance of the arc extinguishing chamber. However, when the bellows is under a large pressure or has a large displacement, it is easy to deform and cause columnar instability. The prior art often provides a certain guiding support for the bellows by setting a guide structure between the bellows and the moving conductive rod, and there is no space between the guide structure and the moving conductive rod to accommodate gas and provide gas flow. However, when the bellows moves at high speed, it will be subject to a large gas compression reaction force, and the compressed gas in the bellows cannot flow. The gas compression reaction force acts on the bellows for a long time, which is easy to cause the bellows to deform or leak, and the service life of the bellows is reduced. In order to avoid deformation or leakage of the bellows, a space that can accommodate gas and provide gas flow is set on the guide structure between the bellows and the moving conductive rod, which can reduce the local pressure of the gas compression reaction force on the bellows. Based on the above invention concept, the present invention proposes a guide assembly, which prolongs the service life of the bellows by setting a gas escape space on the guide assembly.

[0030] Embodiments of the guide assembly of the present invention: See also Figure 3 to Figure 4As a basic embodiment of the present invention, the guide assembly 1 includes a guide collar 2, which is used to cooperate with the inner wall of the bellows 3. The guide collar 2 is connected with a plurality of guide structures 4, which are arranged in an annular array along the inner circumference of the guide collar 2 and extend toward the center of the circle along the radial direction of the guide collar 2. The guide structure 4 is used to contact and cooperate with the contact rod of the moving contact 5. The provision of a plurality of guide structures 4 can form multi-point contact with the contact rod of the moving contact 5, thereby increasing the guiding effect, and preventing the moving contact 5 and the bellows 3 from being offset or eccentric during high-speed movement, resulting in the bellows 3 and The wear of the moving contact 5 is beneficial to maintaining good stability and reliability of the bellows 3 and the moving contact 5 during operation; the space formed between the guide ring 2 and any two adjacent guide structures 4 constitutes a gas escape space 6. When the bellows 3 moves at high speed, the compressed gas inside the bellows 3 can move in the gas escape space 6, and the generated gas compression reaction force will not only act on a part of the bellows 3. Such a setting can make the gas compression reaction force on various parts of the bellows 3 relatively uniform, avoid local deformation and local air leakage of the bellows 3, and increase the service life of the bellows 3.

[0031] As a preferred embodiment of the present invention, the guide structure 4 includes an inner extension arm 7 and a guide arc plate 8, one end of the inner extension arm 7 is connected to the guide collar 2, and the other end is connected to the guide arc plate 8, the center of the guide arc plate 8 coincides with the center of the guide collar 2, in this embodiment, the guide structure 4 is set to four groups, and the four groups of guide structures 4 are distributed in an annular array on the inner circumference of the guide collar 2. Such a setting can make the guide arc plate 8 always coaxial with the guide collar 2, which is convenient for providing synchronous guidance for the bellows 3 and the moving contact 5, avoiding the eccentricity of the bellows 3 and the moving contact 5, causing wear. In other embodiments, the guide structure 4 can also be set to three, as long as the center of each guide arc plate 8 coincides with the center of the guide collar 2.

[0032] As a preferred embodiment of the present invention, the guide arc plate 8 is arranged along the axial direction of the guide ring 2 and its end extends beyond the inner extension arm 7. The guide arc plate 8 is used to contact and cooperate with the outer peripheral surface of the moving contact 5. Such an arrangement can increase the contact area between the guide arc plate 8 and the moving contact 5, further improve the guiding effect, and ensure that the guide arc plate 8 is seamlessly fitted with the outer peripheral surface of the moving contact 5, further improving the synchronous guiding effect between the moving contact 5 and the bellows 3, so that the movement directions of the moving contact 5 and the bellows 3 remain consistent without deviation.

[0033] As a preferred embodiment of the present invention, the guide collar 2, the inner extension arm 7 and the guide arc plate 8 together constitute a guide assembly 1. The guide assembly 1 is integrally formed and processed, and according to the length of the bellows 3, multiple guide assemblies 1 can be arranged inside the bellows 3. The guide assemblies 1 are evenly distributed along the axial direction of the bellows 3 to ensure the guiding effect between the entire bellows 3 and the moving contact 5.

[0034] The use process of the guide component 1 of the present invention is: first, the guide component 1 is machined into shape by machining, and then the formed guide component 1 is fixedly connected to the inner wall of the bellows 3 to form a whole with the guide component 1. When in use, the bellows 3 connected with the guide component 1 is connected to the moving contact 5 and the moving side cover plate by vacuum brazing. During this process, the guide arc plate 8 contacts and cooperates with the outer peripheral surface of the contact rod of the moving contact 5 to realize the guidance of the bellows 3 and the moving contact 5. During the high-speed movement of the bellows 3, the compressed gas inside the bellows 3 flows along the gas escape space 6.

[0035] Embodiments of the bellows assembly of the present invention: See also Figure 5 As a basic embodiment of the present invention, the bellows assembly includes a bellows 3 and a guide assembly 1. The guide assembly 1 is arranged inside the bellows 3 and is firmly connected to the bellows 3 to guide the bellows 3. Such an arrangement can improve the service life of the bellows assembly. The specific structure of the guide assembly 1 is not repeated here.

[0036] As a preferred embodiment of the present invention, the guide component 1 is pre-set in the bellows 3 and is integrally formed with the bellows 3. The bellows 3 is usually formed by a bulging process. Before the bellows is formed, the guide component 1 is placed in the bellows 3 in advance, and the guide component 1 and the bellows 3 are bulged together by a bulging process. Such a setting can improve the guiding effect of the guide component 1 on the bellows 3 and achieve precise guiding.

[0037] As a preferred embodiment of the present invention, the guide assembly is clamped between two adjacent corrugated pipes and welded to the two corrugated pipes. At this time, the two corrugated pipes 3 are shorter in length and stronger in rigidity. The guide assembly 1 is arranged between the two shorter corrugated pipes 3 and is formed into a whole with the two corrugated pipes 3 by welding, so that the guide assembly 1 is firmly connected to the inner wall of the corrugated pipe 3.

[0038] The use process of the bellows assembly of the present invention is as follows: first, the guide assembly 1 is machined into shape by machining, and then the formed guide assembly 1 and the inner wall of the bellows 3 are fixed by integral molding or welding to form a whole with the bellows 3, and then the bellows 3 connected with the guide assembly 1 is connected to the moving contact 5 and the moving side cover plate by vacuum brazing. During this process, the guide arc plate 8 contacts and cooperates with the outer peripheral surface of the contact rod of the moving contact 5 to realize the guidance of the bellows 3 and the moving contact 5. During the high-speed movement of the bellows 3, the compressed gas inside the bellows 3 flows along the gas escape space 6.

[0039] Embodiments of the vacuum interrupter of the present invention: See also Figure 6 The vacuum interrupter 10 includes a moving contact 5, a moving end cover plate 9 and the above-mentioned bellows assembly. The bellows assembly is sleeved on the outer circumferential surface of the moving contact 5. One end of the bellows assembly is welded to the moving contact 5, and the other end is welded to the moving end cover plate 9. Such an arrangement can ensure the stability and reliability of the vacuum interrupter 10 during operation.

[0040] Embodiments of the high voltage switch of the present invention: The high-voltage switch includes the above-mentioned vacuum interrupter 10, and the bellows assembly in the vacuum interrupter 10 includes the bellows 3 and the above-mentioned guide assembly 1, which can ensure the normal operation of the high-voltage switch when in use.

[0041] The above description 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 shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A guide assembly, comprising a guide collar, the guide collar being used to cooperate with the inner wall of a corrugated pipe, characterized in that: The guide collar is connected to a plurality of guide structures, which are arranged in an annular array along the inner circumference of the guide collar and extend toward the center of the circle along the radial direction of the guide collar. The guide structures are used to contact and cooperate with the contact rod of the moving contact. The space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

2. The guide assembly according to claim 1, characterized in that: The guide structure comprises an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

3. The guide assembly according to claim 2, characterized in that: The guide arc plate is arranged along the axial direction of the guide collar and its end portion extends beyond the inner extension arm. The guide arc plate is used for contacting and matching with the outer peripheral surface of the moving contact.

4. The guide assembly according to any one of claims 1 to 3, characterized in that: The guide collar, the inner extension arm and the guide arc plate together constitute a guide assembly, and the guide assembly is integrally formed and processed.

5. A bellows assembly, comprising a bellows and a guide assembly, wherein the guide assembly comprises a guide collar, and the guide collar is used to cooperate with the inner wall of the bellows, and is characterized in that: The guide collar is connected to a plurality of guide structures, which are arranged in an annular array along the inner circumference of the guide collar and extend toward the center of the circle along the radial direction of the guide collar. The guide structures are used to contact and cooperate with the contact rod of the moving contact. The space formed between the guide collar and any two adjacent guide structures constitutes a gas escape space.

6. The bellows assembly according to claim 5, characterized in that: The guide structure comprises an inner extension arm and a guide arc plate, one end of the inner extension arm is connected to the guide collar, and the other end is connected to the guide arc plate, and the center of the guide arc plate coincides with the center of the guide collar.

7. The bellows assembly according to any one of claims 5 to 6, characterized in that: The guide assembly is preset in the corrugated pipe and is integrally formed with the corrugated pipe.

8. The bellows assembly according to any one of claims 5 to 6, characterized in that: The guide assembly is clamped between two adjacent corrugated pipes and fixed to the two corrugated pipes by welding.

9. A vacuum interrupter, including a moving contact, characterized in that: It also includes the bellows assembly according to any one of claims 5 to 8, and the bellows assembly is sleeved on the outer peripheral surface of the moving contact.

10. A high voltage switch, characterized in that: Comprising the vacuum interrupter chamber as claimed in claim 9.

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