Circuit breaker for 27.5 kV gas-insulated switchgear

Abstract

The utility model discloses a circuit breaker used for a 27.5 kV gas-insulated switchgear, which relates to the technical field of circuit breakers and comprises a shell, a static contact and a moving contact are arranged in the shell, a first guide block is arranged outside the static contact, a second guide block is arranged outside the moving contact, and when the static contact is contacted with the moving contact, the first guide block and the second guide block are separated from each other. The first guide block and the second guide block are matched for guiding, a fixing seat is fixedly connected to the inner wall of the first guide block, a rotating shaft is fixedly connected to the fixing seat, a rotating seat is rotationally connected to the rotating shaft, and an elastic telescopic rod is fixedly connected to the face, back to the fixing seat, of the rotating seat; the second guide block is provided with a guide step groove matched with the elastic telescopic rod. According to the circuit breaker for the 27.5 kV gas insulated switchgear, by arranging the elastic telescopic rod, the guide stepped groove and other structures, when the first guide block makes contact with the second guide block, the force unloading buffering effect is achieved; and the elastic telescopic rod cannot be continuously extruded, so that the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker for a 27.5kV gas-filled switchgear. Background Technology

[0002] With economic development, circuit breakers, with their environmental friendliness, long lifespan, and maintenance-free characteristics, are gradually replacing sulfur hexafluoride circuit breakers and have become a research hotspot both domestically and internationally. Vacuum interrupters in circuit breakers are generally designed with a single-contact structure. However, this single-contact structure has poor guiding effect when the moving and stationary contacts are in contact, making it prone to positional deviations, especially after repeated opening and closing.

[0003] For example, a patent entitled "A Gas-Insulated Switchgear Circuit Breaker" (patent application number: CN202322672787.3) discloses a gas-insulated switchgear circuit breaker. By setting a first guide block and a second guide block, when the moving contact and the stationary contact are in contact, the first inclined surface of the first guide block and the second inclined surface of the second guide block can play a guiding role, while also ensuring reliable contact between the moving contact and the stationary contact. However, when the first guide block and the second guide block are close together, the spring is continuously compressed, reducing its service life.

[0004] Therefore, it is necessary to propose a circuit breaker for 27.5kV gas-insulated switchgear to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a circuit breaker for a 27.5kV gas-insulated switchgear to solve the problem that the spring is continuously compressed and its service life is reduced when the first guide block and the second guide block are close together.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker for a 27.5kV gas-insulated switchgear, comprising a housing, wherein a stationary contact and a moving contact are disposed inside the housing, a first guide block is disposed outside the stationary contact, and a second guide block is disposed outside the moving contact. When the stationary contact and the moving contact are in contact, the first guide block and the second guide block cooperate to guide each other. A fixed seat is fixedly connected to the inner wall of the first guide block, a rotating shaft is fixedly connected to the fixed seat, and a rotating base is rotatably connected to the rotating shaft. An elastic telescopic rod is fixedly connected to the side of the rotating base facing away from the fixed seat. A guide step groove that cooperates with the elastic telescopic rod is provided on the second guide block.

[0007] Preferably, there are two of each of the fixed base and the guide step groove, and the fixed base cooperates with the corresponding guide step groove.

[0008] Preferably, a limiting block is fixedly connected to the side of the fixed base near the stationary contact.

[0009] Preferably, a stationary conductive rod is provided at one end of the housing, and the first guide block and the stationary contact are fixedly connected to the stationary conductive rod; a movable conductive rod is provided at the other end of the housing, and the second guide block and the movable contact are fixedly connected to the movable conductive rod.

[0010] Preferably, the static conductive rod is provided with a first guide ring, which is fixedly connected to the outer wall of the housing.

[0011] Preferably, the moving conductive rod is provided with a second guide ring, which is fixedly connected to the outer wall of the housing.

[0012] Preferably, a guide rod is fixedly connected to the side of the second guide block facing away from the first guide block, and a guide groove that cooperates with the guide rod is provided on the outer shell.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. This utility model achieves a force-relieving and buffering effect when the first guide block and the second guide block come into contact by setting up structures such as elastic telescopic rods and guide stepped grooves; and will not cause continuous compression to the elastic telescopic rods, thus extending their service life.

[0015] 2. During the contact process between the stationary contact and the moving contact, the first guide block and the second guide block cooperate to guide the contact, avoid deviation, and ensure stable contact between the stationary contact and the moving contact. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit breaker structure of the present invention for a 27.5kV gas-insulated switchgear.

[0017] Figure 2 This is a cross-sectional view of the circuit breaker structure of the present invention used in a 27.5kV gas-filled switchgear.

[0018] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Figure 4 This is a schematic diagram of the rotating base and elastic telescopic rod structure of this utility model.

[0020] In the diagram: 1. Outer shell; 2. First guide ring; 3. Static conductive rod; 4. Static contact; 5. First guide block; 6. Second guide ring; 7. Moving conductive rod; 8. Moving contact; 9. Second guide block; 10. Rotating shaft; 11. Guide rod; 12. Guide groove; 13. Fixed seat; 14. Limiting block; 15. Rotary seat; 16. Elastic telescopic rod; 17. Guide stepped groove. Detailed Implementation

[0021] This utility model provides, for example Figures 1-4The circuit breaker shown is for a 27.5kV gas-insulated switchgear, including a housing 1. Inside the housing 1 are a stationary contact 4 and a moving contact 8. A first guide block 5 is located outside the stationary contact 4, and a second guide block 9 is located outside the moving contact 8. The second guide block 9 is trapezoidal in shape, and a trapezoidal groove is provided on the side of the first guide block 5 closest to the second guide block 9, corresponding to and engaging with the second guide block 9. When the second guide block 9 moves towards the first guide block 5, it retracts into the trapezoidal groove of the first guide block 5. During the contact between the stationary contact 4 and the moving contact 8, the first guide block 5 and the second guide block 9 cooperate to guide the contact, preventing deviation and ensuring a stable fit between the stationary contact 4 and the moving contact 8. This is particularly important for 27.5kV gas-insulated switchgear, ensuring the stability of the switchgear operation.

[0022] A stationary conductive rod 3 is provided at one end of the outer casing 1. The first guide block 5 and the stationary contact 4 are both fixedly connected to the stationary conductive rod 3, and the stationary contact 4 is located at the end of the stationary conductive rod 3 near the second guide block 9 (see reference). Figure 2 The other end of the outer casing 1 is provided with a movable conductive rod 7, and the second guide block 9 and the movable contact 8 are both fixedly connected to the movable conductive rod 7.

[0023] To improve the stability of the static conductive rod 3, a first guide ring 2 is provided on the static conductive rod 3, and the first guide ring 2 is fixedly connected to the outer wall of the outer casing 1.

[0024] To improve the stability of the moving conductive rod 7, a second guide ring 6 is provided on the moving conductive rod 7, and the second guide ring 6 is fixedly connected to the outer wall of the outer casing 1.

[0025] A guide rod 11 is fixedly connected to the side of the second guide block 9 facing away from the first guide block 5, and a guide groove 12 is provided on the outer shell 1 to cooperate with the guide rod 11. The guide rod 11 and the guide groove 12 are provided to improve the stability of the movement of the second guide block 9 and the moving conductive rod 7.

[0026] To buffer the contact between the first guide block 5 and the second guide block 9 and avoid direct impact, a fixed seat 13 is fixedly connected to the inner wall of the first guide block 5. A rotating shaft 10 is fixedly connected to the fixed seat 13, and a rotating base 15 is rotatably connected to the rotating shaft 10. An elastic telescopic rod 16 is fixedly connected to the side of the rotating base 15 facing away from the fixed seat 13. The second guide block 9 has a guide stepped groove 17 that cooperates with the elastic telescopic rod 16. The guide stepped groove 17 is inclined (see reference). Figure 2 ), and it is stepped.

[0027] There are two fixed seats 13 and two guide step grooves 17. The fixed seats 13 are matched with the corresponding guide step grooves 17.

[0028] When the first guide block 5 and the second guide block 9 are not in contact, the elastic telescopic rod 16 is vertically downward.

[0029] In actual use, as the second guide block 9 moves toward the first guide block 5, the bottom end of the elastic telescopic rod 16 will first contact the inclined surface of the upper half of the guide step groove 17, and the elastic telescopic rod 16 will contract to achieve the effect of force relief and buffering. As the second guide block 9 continues to move, under the guidance of the inclined surface of the guide step groove 17, the elastic telescopic rod 16 will swing away from the moving conductive rod 7, and the bottom end of the elastic telescopic rod 16 will lose its squeezing effect, thus preventing continuous squeezing of the elastic telescopic rod 16 and extending its service life.

[0030] A limiting block 14 is fixedly connected to the side of the fixed base 13 near the stationary contact 4. The limiting block 14 is set to prevent the limiting block 14 from swinging towards the stationary contact 4, so as to facilitate its cooperation with the guide step groove 17.

Claims

1. A circuit breaker for a 27.5kV gas-insulated switchgear, comprising a housing (1), characterized in that: The housing (1) is provided with a stationary contact (4) and a moving contact (8) inside. A first guide block (5) is provided outside the stationary contact (4), and a second guide block (9) is provided outside the moving contact (8). When the stationary contact (4) and the moving contact (8) are in contact, the first guide block (5) and the second guide block (9) cooperate to guide each other. A fixed seat (13) is fixedly connected to the inner wall of the first guide block (5). A rotating shaft (10) is fixedly connected to the fixed seat (13). A rotating seat (15) is rotatably connected to the rotating shaft (10). An elastic telescopic rod (16) is fixedly connected to the side of the rotating seat (15) facing away from the fixed seat (13). A guide step groove (17) that cooperates with the elastic telescopic rod (16) is opened on the second guide block (9).

2. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 1, characterized in that: Two fixed seats (13) and two guide step grooves (17) are provided, and the fixed seats (13) cooperate with the corresponding guide step grooves (17).

3. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 1, characterized in that: The fixed base (13) is fixedly connected to the limit block (14) on the side near the stationary contact (4).

4. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 1, characterized in that: One end of the outer shell (1) is provided with a static conductive rod (3), and the first guide block (5) and the static contact (4) are fixedly connected to the static conductive rod (3). The other end of the outer shell (1) is provided with a moving conductive rod (7), and the second guide block (9) and the moving contact (8) are fixedly connected to the moving conductive rod (7).

5. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 4, characterized in that: The static conductive rod (3) is provided with a first guide ring (2), which is fixedly connected to the outer wall of the outer shell (1).

6. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 4, characterized in that: The moving conductive rod (7) is provided with a second guide ring (6), which is fixedly connected to the outer wall of the outer shell (1).

7. A circuit breaker for a 27.5kV gas-insulated switchgear according to claim 1, characterized in that: The second guide block (9) has a guide rod (11) fixedly connected to the side facing away from the first guide block (5), and the outer shell (1) has a guide groove (12) that cooperates with the guide rod (11).

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