A vacuum circuit breaker with suppression of opening rebound and overshoot

Abstract

The utility model provides a kind of pole-mounted vacuum circuit breaker with inhibit opening rebound and overshoot, it is related to vacuum circuit breaker technical field, including shell assembly and pole, the pole is equipped in the upper end of shell assembly, the upper end of inside pole is equipped with arc-extinguishing chamber, and the lower end of inside pole is elastically equipped with insulating pull rod, the lower end of arc-extinguishing chamber is equipped with the conduction of insulating pull rod Conductive clamp;The utility model installs overshoot rebound suppression buffer plate on main shaft, when opening action is carried out, main shaft moves, is pulled adjusting screw by connecting shaft, and the adjusting screw head of insulating pull rod will impact on the upper side of overshoot rebound suppression buffer plate, can effectively reduce the opening overshoot speed and kinetic energy of movable contact, reduce overshoot, improve the buffering effect, using the non-deformation effect of overshoot rebound suppression buffer plate, overcome the problem that simple rubber buffer is prone to rebound, make buffering performance more stable and reliable to protect the components inside arc-extinguishing chamber.

Description

Technical Field

[0001] This utility model relates to the field of vacuum circuit breaker technology, and in particular to a pole-mounted vacuum circuit breaker that suppresses tripping rebound and overshoot. Background Technology

[0002] Pole-mounted vacuum circuit breakers are critical equipment in power distribution networks, playing a vital role in control and protection within the power system. When a system fault occurs, the pole-mounted vacuum circuit breaker must quickly interrupt the fault current to protect electrical equipment and ensure the safe and stable operation of the power system. During the tripping process of a pole-mounted vacuum circuit breaker, the moving contact moves rapidly under the action of the tripping spring. However, due to inertia and the inherent characteristics of the mechanism, overshoot can easily occur, meaning the moving contact moves beyond the normal tripping position. This not only causes additional stress on components such as the bellows inside the arc-extinguishing chamber, reducing their service life, but may also lead to a decline in the mechanical performance of the entire arc-extinguishing chamber, affecting subsequent normal operation. Simultaneously, tripping rebound is also a common problem. After tripping, the moving contact will bounce back towards the closing direction under the rebound force. If the rebound amplitude is too large, the distance between the contacts will be too small, potentially causing arc reignition, leading to switch failure and even serious power accidents, affecting the normal power supply of the grid.

[0003] Existing methods for suppressing tripping rebound and overshoot have many shortcomings. For example, some methods use oil buffers, which, while providing some buffering effect, are prone to oil leakage. Once leakage occurs, the buffering effect is greatly reduced, and frequent maintenance and replacement are required, increasing operating costs and maintenance difficulty. Other methods use rubber buffers, but their buffering effect is greatly affected by the properties of the rubber material. With increased use time and environmental factors, the rubber is prone to aging, leading to a gradual deterioration in buffering performance and an inability to continuously and effectively suppress tripping rebound and overshoot. Therefore, this invention proposes a pole-mounted vacuum circuit breaker that suppresses tripping rebound and overshoot to solve the problems existing in the prior art. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a pole-mounted vacuum circuit breaker that suppresses tripping rebound and overshoot. This pole-mounted vacuum circuit breaker utilizes the overshoot rebound suppression buffer plate's non-deformation function to overcome the problem of easy rebound in simple rubber buffers, making the buffer performance more stable and reliable, thereby protecting the internal components of the arc-extinguishing chamber, extending its service life, and improving the mechanical performance stability of the arc-extinguishing chamber.

[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot, comprising a housing assembly and a pole, the pole being disposed at the upper end of the housing assembly, an arc-extinguishing chamber being provided at the upper end of the pole, and an insulating pull rod being elastically provided at the lower end of the pole, a conductive clamp communicating with the insulating pull rod being provided at the lower end of the arc-extinguishing chamber, and an adjusting screw extending into the housing assembly being provided at the lower end of the insulating pull rod;

[0006] The housing assembly has a main shaft inside, and the lower end of the adjusting screw is hinged to a connecting shaft, and the lower end of the connecting shaft is hinged to the main shaft. The top of the main shaft is provided with an overshoot rebound suppression buffer plate corresponding to the position of the adjusting screw.

[0007] A further improvement is that an overtravel spring is provided below the outer side of the insulating pull rod, and the lower end of the overtravel spring is connected to the lower end inside the pole post.

[0008] A further improvement is that a flexible connection is connected to the conductive clamp, and a conductive rod is provided on one side of the flexible connection, with the upper end of the insulating pull rod passing through the flexible connection.

[0009] A further improvement is that: one end of the conductive rod is connected to a first lead wire, and the upper end of the arc-extinguishing chamber is connected to a second lead wire.

[0010] A further improvement is that the bottom of the housing assembly is provided with a top cover plate.

[0011] A further improvement is that: the top of the housing assembly is provided with a sliding foot, and the sliding foot is provided with a sliding groove, and the main shaft is slidably installed in the sliding groove via a sliding shaft.

[0012] A further improvement is that: an auxiliary switch assembly is provided at one end of the top of the housing assembly, and the auxiliary switch assembly includes an auxiliary motor and a first open clamp. The first open clamp is located at the output end of the auxiliary motor, and a protrusion adapted to the first open clamp is provided at one end of the top of the main shaft.

[0013] A further improvement is that: one end of the main shaft is provided with a side rod, and one end of the housing assembly is rotatably provided with a split pointer, and the inner side of the split pointer is connected to a second open clamp, which is adapted to the side rod.

[0014] A further improvement is that: one end of the housing assembly is provided with an aviation plug cap, and one end of the housing assembly is provided with a brake spring assembly, and one end of the brake spring assembly is connected to a side rod.

[0015] A further improvement is that: an operating mechanism is provided at the end of the housing assembly away from the opening spring assembly, and the operating mechanism is used to drive the main shaft to open or close the circuit breaker; a closing / opening shaft assembly is provided at the end of the housing assembly away from the aviation plug, and the closing / opening shaft assembly is connected to the operating mechanism.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model installs an overshoot rebound suppression buffer plate on the main shaft. When the circuit breaker is opened, the main shaft moves, pulling the adjusting screw through the coupling. The adjusting screw head of the insulating pull rod will hit the top of the overshoot rebound suppression buffer plate, which can effectively reduce the overshoot speed and kinetic energy of the moving contact, reduce the overshoot amount, and improve the buffering effect. By utilizing the non-deformation function of the overshoot rebound suppression buffer plate, the problem of easy rebound of simple rubber buffer is overcome, making the buffering performance more stable and reliable, thereby protecting the internal components of the arc extinguishing chamber, extending its service life, and improving the mechanical performance stability of the arc extinguishing chamber.

[0018] 2. This utility model directly installs the overshoot rebound suppression buffer plate on the main shaft, reducing the additional buffer installation steps of the overall switch, making switch data debugging faster and more accurate, thereby improving production efficiency. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the pole post of this utility model;

[0022] Figure 4 This is a schematic diagram of the main shaft of this utility model;

[0023] Figure 5 This is a schematic diagram showing the connection between the adjusting screw and the main shaft of this utility model;

[0024] Figure 6 This is a schematic diagram of the internal structure of the housing assembly of this utility model;

[0025] Figure 7 This is a schematic diagram of the sliding foot of this utility model.

[0026] The components include: 1. Housing assembly; 2. Pole post; 3. Arc extinguishing chamber; 4. Insulating pull rod; 5. Adjusting screw; 6. Main shaft; 7. Coupling shaft; 8. Overshoot rebound suppression buffer plate; 9. Conductive clamp; 10. Overtravel spring; 11. Flexible connection; 12. Conductive rod; 13. First outlet; 14. Second outlet; 15. Top cover sealing plate; 16. Auxiliary motor; 17. First opening clamp; 18. Protruding rod; 19. Side rod; 20. Opening / closing pointer; 21. Second opening clamp; 22. Aircraft plug cap; 23. Opening spring assembly; 24. Operating mechanism; 25. Opening / closing shaft assembly; 26. Sliding foot. Detailed Implementation

[0027] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0028] Example 1

[0029] according to Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, this embodiment proposes a pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot, including a housing assembly 1 and pole posts 2. The pole posts 2 are located at the upper end of the housing assembly 1. An arc-extinguishing chamber 3 is provided at the upper end of the pole post 2, and an insulating pull rod 4 is elastically provided at the lower end of the pole post 2. A conductive clamp 9 that is in communication with the insulating pull rod 4 is provided at the lower end of the arc-extinguishing chamber 3. An adjusting screw 5 that extends into the housing assembly 1 is provided at the lower end of the insulating pull rod 4. The pole post 2 has three sets.

[0030] The housing assembly 1 has a movable main shaft 6 inside. The lower end of the adjusting screw 5 is hinged to a connecting shaft 7, and the lower end of the connecting shaft 7 is hinged to the main shaft 6. An overshoot rebound suppression buffer plate 8 is provided at the top of the main shaft 6 corresponding to the position of the adjusting screw 5. The outer shell of the arc-extinguishing chamber 3 is made of high-strength insulating material, possessing excellent insulation performance and mechanical strength, effectively preventing internal arc leakage and the influence of external environmental factors on the arc-extinguishing chamber 3. The overshoot rebound suppression buffer plate 8 is a non-deformable plate. The overshoot rebound suppression buffer plate 8 is installed on the main shaft 6. When the circuit breaker is opened, the main shaft 6 moves and pulls the adjusting screw 5 through the connecting shaft 7. The head of the adjusting screw 5 of the insulating pull rod 4 will hit the top of the overshoot rebound suppression buffer plate 8, which can effectively reduce the overshoot speed and kinetic energy of the moving contact, reduce the overshoot amount, and improve the buffering effect. By utilizing the non-deformation function of the overshoot rebound suppression buffer plate 8, the problem of easy rebound of simple rubber buffer is overcome, making the buffering performance more stable and reliable, thereby protecting the internal components of the arc-extinguishing chamber 3, extending its service life, and improving the mechanical performance stability of the arc-extinguishing chamber 3.

[0031] An overtravel spring 10 is provided on the lower outer side of the insulating pull rod 4, and the lower end of the overtravel spring 10 is connected to the lower end inside the pole post 2. During the closing process, the main shaft 6 is reset, and under the action of the overtravel spring 10, the insulating pull rod 4 is reset, and the upper end contacts the conductive clamp 9.

[0032] A flexible connector 11 is connected to the conductive clamp 9, and a conductive rod 12 is provided on one side of the flexible connector 11. The upper end of the insulating pull rod 4 passes through the flexible connector 11. One end of the conductive rod 12 is connected to a first lead-out terminal 13, and the upper end of the arc-extinguishing chamber 3 is connected to a second lead-out terminal 14. In use, the first lead-out terminal 13 and the second lead-out terminal 14 are used to connect to an external cable.

[0033] The bottom of the housing assembly 1 is provided with a top cover plate 15. In use, the top cover plate 15 is used to seal the housing assembly 1 to prevent dust and water.

[0034] The top of the housing assembly 1 is provided with a sliding foot 26, and the sliding foot 26 is provided with a sliding groove. The main shaft 6 is slidably installed in the sliding groove via a sliding shaft. In use, the main shaft 6 is slidably installed in the sliding groove via a sliding shaft, thereby sliding inside the sliding foot 26 to open or close the circuit breaker.

[0035] An auxiliary switch assembly is provided at one end of the top of the housing assembly 1. The auxiliary switch assembly includes an auxiliary motor 16 and a first opening clamp 17. The first opening clamp 17 is located at the output end of the auxiliary motor 16. A protrusion 18 adapted to the first opening clamp 17 is provided at one end of the top of the main shaft 6. In use, the auxiliary motor 16 drives the first opening clamp 17 to rotate. The first opening clamp 17 moves eccentrically, causing the opening to drive the protrusion 18 to move, thereby assisting in driving the main shaft 6 to move.

[0036] One end of the main shaft 6 is provided with a side rod 19, and one end of the housing assembly 1 is rotatably provided with an open / close pointer 20, and the inner side of the open / close pointer 20 is connected to a second open clamp 21, which is adapted to the side rod 19. During the movement of the main shaft 6, the side rod 19 cooperates with the opening of the second open clamp 21, causing the second open clamp 21 to rotate, which drives the open / close pointer 20 to rotate, pointing to the open or closed icon on the housing assembly 1.

[0037] Example 2

[0038] according to Figure 1 , 2As shown in Figures 3, 4, 5, 6, and 7, this embodiment proposes a pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot, including a housing assembly 1 and pole posts 2. The pole posts 2 are located at the upper end of the housing assembly 1. An arc-extinguishing chamber 3 is provided at the upper end of the pole post 2, and an insulating pull rod 4 is elastically provided at the lower end of the pole post 2. A conductive clamp 9 that is in communication with the insulating pull rod 4 is provided at the lower end of the arc-extinguishing chamber 3. An adjusting screw 5 that extends into the housing assembly 1 is provided at the lower end of the insulating pull rod 4. The pole post 2 has three sets.

[0039] The housing assembly 1 has a movable main shaft 6 inside. The lower end of the adjusting screw 5 is hinged to a connecting shaft 7, and the lower end of the connecting shaft 7 is hinged to the main shaft 6. An overshoot rebound suppression buffer plate 8 is provided at the top of the main shaft 6 corresponding to the position of the adjusting screw 5. The outer shell of the arc-extinguishing chamber 3 is made of high-strength insulating material, possessing excellent insulation performance and mechanical strength, effectively preventing internal arc leakage and the influence of external environmental factors on the arc-extinguishing chamber 3. The overshoot rebound suppression buffer plate 8 is a non-deformable plate. The overshoot rebound suppression buffer plate 8 is installed on the main shaft 6. When the circuit breaker is opened, the main shaft 6 moves and pulls the adjusting screw 5 through the connecting shaft 7. The head of the adjusting screw 5 of the insulating pull rod 4 will hit the top of the overshoot rebound suppression buffer plate 8, which can effectively reduce the overshoot speed and kinetic energy of the moving contact, reduce the overshoot amount, and improve the buffering effect. By utilizing the non-deformation function of the overshoot rebound suppression buffer plate 8, the problem of easy rebound of simple rubber buffer is overcome, making the buffering performance more stable and reliable, thereby protecting the internal components of the arc-extinguishing chamber 3, extending its service life, and improving the mechanical performance stability of the arc-extinguishing chamber 3.

[0040] One end of the housing assembly 1 is provided with an aviation connector cap 22, and the other end inside the housing assembly 1 is provided with a trip spring assembly 23, with one end of the trip spring assembly 23 connected to the side rod 19. The aviation connector cap, also known as an aviation plug cap, is a protective device used to protect aviation connectors. It is mainly used to prevent dust, moisture, and other external factors from entering the connector, ensuring the stability of the electrical connection and the normal operation of the equipment. The trip spring assembly 23 stores energy; upon receiving a trip signal, the operating mechanism releases the main shaft 6, and under the energy of the trip spring assembly 23, drives the main shaft 6 to move, pulling the adjusting screw 5 for rapid tripping.

[0041] An operating mechanism 24 is provided at the end of the housing assembly 1 away from the opening spring assembly 23. The operating mechanism 24 is used to drive the main shaft 6 to perform opening or closing operations. A closing / opening shaft assembly 25 is provided at the end of the housing assembly 1 away from the connector cap 22, and the closing / opening shaft assembly 25 is connected to the operating mechanism 24. The operating mechanism 24 is a prior art technology with a simple structure and reliable operation. It has a built-in energy storage motor and a closing spring. The energy storage motor can pull the main shaft 6 to move, conveniently storing energy for the opening spring assembly 23 and the closing spring, ensuring that the circuit breaker can perform opening and closing operations in a timely, accurate, and fast manner when needed.

[0042] This pole-mounted vacuum circuit breaker, designed to suppress tripping rebound and overshoot, mounts an overshoot rebound suppression buffer plate 8 on the main shaft 6. During tripping, the main shaft 6 moves, pulling the adjusting screw 5 via the connecting shaft 7. The adjusting screw 5 of the insulating pull rod 4 strikes the top of the overshoot rebound suppression buffer plate 8, effectively reducing the tripping overshoot speed and kinetic energy of the moving contact, decreasing the overshoot amount, and improving the buffering effect. The non-deformable nature of the overshoot rebound suppression buffer plate 8 overcomes the problem of rebound common with simple rubber buffers, making the buffering performance more stable and reliable, thus protecting the internal components of the arc-extinguishing chamber 3, extending its service life, and improving the mechanical stability of the arc-extinguishing chamber 3. Furthermore, by directly mounting the overshoot rebound suppression buffer plate 8 on the main shaft 6, this product reduces the need for additional buffer installation steps for the entire switch, making switch data debugging faster and more accurate, thereby improving production efficiency.

[0043] The reliable tolerance fit of the main shaft 6 design greatly reduces the overshoot when the adjusting screw 5 hits the main shaft. At the same time, the pole 2 has three sets of three-phase contacts. This design disperses the overshoot force of the tripping contact, resulting in particularly small test data for tripping rebound and overshoot. The standard requirement is ≤2mm, and the test results of this design are ≤0.5mm.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot, comprising a housing assembly (1) and a pole (2), characterized in that: The pole post (2) is located at the upper end of the housing assembly (1). The upper end of the pole post (2) is provided with an arc-extinguishing chamber (3), and the lower end of the pole post (2) is elastically provided with an insulating pull rod (4). The lower end of the arc-extinguishing chamber (3) is provided with a conductive clamp (9) that is in communication with the insulating pull rod (4). The lower end of the insulating pull rod (4) is provided with an adjusting screw (5) that extends into the housing assembly (1). The housing assembly (1) is equipped with a main shaft (6) inside. The lower end of the adjusting screw (5) is hinged to a connecting shaft (7), and the lower end of the connecting shaft (7) is hinged to the main shaft (6). The top of the main shaft (6) is provided with an overshoot rebound suppression buffer plate (8) corresponding to the position of the adjusting screw (5).

2. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot as described in claim 1, characterized in that: An overtravel spring (10) is provided below the outer side of the insulating pull rod (4), and the lower end of the overtravel spring (10) is connected to the lower end inside the pole post (2).

3. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot as described in claim 1, characterized in that: The conductive clamp (9) is connected to a flexible connector (11), and a conductive rod (12) is provided on one side of the flexible connector (11). The upper end of the insulating pull rod (4) passes through the flexible connector (11).

4. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot as described in claim 3, characterized in that: One end of the conductive rod (12) is connected to a first lead wire (13), and the upper end of the arc-extinguishing chamber (3) is connected to a second lead wire (14).

5. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot according to claim 1, characterized in that: The bottom of the housing assembly (1) is provided with a top cover plate (15).

6. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot as described in claim 1, characterized in that: The top of the housing assembly (1) is provided with a sliding foot (26) and a sliding groove is provided on the sliding foot (26). The main shaft (6) is slidably installed in the sliding groove via the sliding shaft.

7. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot according to claim 1, characterized in that: An auxiliary switch assembly is provided at one end of the top of the housing assembly (1), and the auxiliary switch assembly includes an auxiliary motor (16) and a first opening clamp (17). The first opening clamp (17) is located at the output end of the auxiliary motor (16), and a protruding rod (18) adapted to the first opening clamp (17) is provided at one end of the top of the main shaft (6).

8. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot according to claim 1, characterized in that: One end of the main shaft (6) is provided with a side rod (19), and one end of the housing assembly (1) is provided with a split pointer (20) that rotates, and the inner side of the split pointer (20) is connected with a second opening clamp (21), which is adapted to the side rod (19).

9. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot as described in claim 8, characterized in that: One end of the housing assembly (1) is provided with a pilot plug (22), and one end of the housing assembly (1) is provided with a brake spring assembly (23), and one end of the brake spring assembly (23) is connected to a side rod (19).

10. A pole-mounted vacuum circuit breaker with suppression of tripping rebound and overshoot according to claim 9, characterized in that: An operating mechanism (24) is provided at one end of the housing assembly (1) away from the opening spring assembly (23), and the operating mechanism (24) is used to drive the main shaft (6) to open or close the circuit. A closing shaft assembly (25) is provided at one end of the housing assembly (1) away from the aviation plug cap (22), and the closing shaft assembly (25) is connected to the operating mechanism (24).

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