Vacuum arc-extinguishing chamber for circuit breaker

Abstract

The utility model discloses a vacuum arc-extinguishing chamber for a circuit breaker, which comprises a ceramic shell, a movable end cover plate arranged at the top of the ceramic shell and a static end cover plate arranged at the bottom of the ceramic shell, a movable conducting rod is slidably mounted in the middle of the movable end cover plate, one end of the movable conducting rod penetrates through the movable end cover plate and extends into the ceramic shell, and the other end of the movable conducting rod penetrates through the static end cover plate. The middle of the static end cover plate is fixedly connected with a static conducting rod, one end of the static conducting rod penetrates through the static end cover plate and extends into the ceramic shell, the adjacent ends of the dynamic conducting rod and the static conducting rod are provided with a dynamic contact and a static contact respectively, the bottom of the static conducting rod is connected with a static conducting block, and the inner wall of the ceramic shell is provided with a main shielding cover. According to the utility model, metal particles can be prevented from flying out of the upper and lower openings of the main shielding case through the material blocking cylinder, the cleaning ring and the auxiliary shielding case, and the metal particles are prevented from splashing to the inner wall of the ceramic shell to influence the insulating property of the ceramic shell, so that the service life of the ceramic shell is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter technology, specifically a vacuum interrupter for circuit breakers. Background Technology

[0002] The vacuum interrupter is the core component of a circuit breaker, mainly used for breaking and making current in power systems, and also for insulation in the open state. It utilizes the insulation characteristics of the high vacuum environment inside the tube to quickly extinguish the arc and suppress the current when the circuit is interrupted. It is mainly composed of components such as a ceramic shell, shielding cover, moving contact, stationary contact, bellows, moving conductive rod, and stationary conductive rod.

[0003] In existing vacuum interrupters, the opening and closing of the moving and stationary contacts generates metal particles that splash outward in droplet form under the action of an electric arc. Although most of the metal particles are blocked by the shield, the shield is open at both the top and bottom, and there are large gaps between the shield and the moving and stationary conductive rods. Therefore, some metal particles will splash onto the ceramic shell, which will significantly reduce its insulation strength and may gradually erode the ceramic shell through partial discharge, eventually leading to penetrating breakdown and greatly shortening the service life of the vacuum interrupter. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum interrupter for circuit breakers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum interrupter for a circuit breaker, comprising a ceramic housing, a moving end cover plate disposed on the top of the ceramic housing, and a stationary end cover plate disposed on the bottom of the ceramic housing. A moving conductive rod is slidably mounted in the middle of the moving end cover plate, one end of which extends through the moving end cover plate into the interior of the ceramic housing. A stationary conductive rod is fixedly connected in the middle of the stationary end cover plate, one end of which extends through the stationary end cover plate into the interior of the ceramic housing. A moving contact and a stationary contact are respectively mounted on adjacent ends of the moving and stationary conductive rods. A static conductive block is connected to the bottom of the conductive rod. A main shield is installed on the inner wall of the ceramic shell. A baffle cylinder is slidably installed on the outer side of the static conductive rod. A spring is sleeved on the outer side of the static conductive rod. A cleaning ring is provided on the top edge of the baffle cylinder. The outer wall of the cleaning ring abuts against the inner wall of the main shield. A protruding edge is provided on the top of the baffle cylinder. Multiple slag discharge grooves are provided between the protruding edge and the baffle cylinder in an annular and equidistant manner. An L-shaped rod is symmetrically fixedly connected to the outer side of the moving conductive rod. The bottom of the L-shaped rod abuts against the top of the protruding edge. A secondary shield is installed on the outer side of the moving conductive rod.

[0006] In a preferred embodiment of this utility model, the outer side wall of the secondary shield abuts against the inner side wall of the main shield.

[0007] As a preferred embodiment of this utility model, the cleaning ring is made of silicone rubber, and the top of the cleaning ring is provided with a bevel.

[0008] As a preferred embodiment of this utility model, a corrugated pipe is installed on the outside of the moving conductive rod, one end of the corrugated pipe is connected to the moving end cover plate, and the other end of the corrugated pipe is connected to the moving conductive rod.

[0009] In a preferred embodiment of this utility model, the top of the spring abuts against the bottom of the baffle cylinder, and the bottom of the spring abuts against the top of the stationary end cover plate.

[0010] As a preferred embodiment of this utility model, the bottom of the L-shaped rod is provided with a groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model can prevent metal particles from flying out from the upper and lower openings of the main shielding cover by setting the baffle cylinder, cleaning ring and secondary shielding cover, so as to avoid metal particles splashing onto the inner wall of the ceramic shell and affecting the insulation performance of the ceramic shell, thereby extending the service life of the ceramic shell. In addition, the setting cleaning ring, baffle cylinder and spring can clean the main shielding cover, preventing a large number of metal particles from adhering to the main shielding cover and affecting the heat dissipation efficiency of the main shielding cover. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0015] Figure 4 This is a schematic diagram of the structure of the baffle cylinder of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the L-shaped rod of this utility model.

[0017] In the diagram: 1. Ceramic shell; 2. Stationary end cover; 3. Stationary conductive block; 4. Moving end cover; 5. Moving conductive rod; 6. Bellows; 7. Secondary shield; 8. Main shield; 9. Stationary conductive rod; 10. Spring; 11. L-shaped rod; 12. Protruding edge; 13. Cleaning ring; 14. Slag chute; 15. Material baffle; 16. Stationary contact; 17. Moving contact; 18. Groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1 to 5This utility model provides a technical solution: a vacuum interrupter for a circuit breaker, comprising a ceramic housing 1, a moving end cover 4 disposed on the top of the ceramic housing 1, and a stationary end cover 2 disposed on the bottom of the ceramic housing 1. A moving conductive rod 5 is slidably mounted in the middle of the moving end cover 4, one end of which extends through the moving end cover 4 into the interior of the ceramic housing 1. A stationary conductive rod 9 is fixedly connected in the middle of the stationary end cover 2, one end of which extends through the stationary end cover 2 into the interior of the ceramic housing 1. A moving contact 17 and a stationary contact 16 are respectively installed at adjacent ends of the moving conductive rod 5 and the stationary conductive rod 9. A stationary conductive block 3 is connected to the bottom of the stationary conductive rod 9. The inner wall of the ceramic housing 1 is fitted with... The system is equipped with a main shield 8, which has openings at both the top and bottom. A baffle cylinder 15 is slidably mounted on the outer side of the static conductive rod 9. The baffle cylinder 15 is used to prevent metal particles from flying out from the lower opening of the main shield 8, thus avoiding contamination of the ceramic shell 1 by metal particles and affecting its insulation performance. A spring 10 is sleeved on the outer side of the static conductive rod 9. The spring 10 applies a pushing force to the baffle cylinder 15, causing the baffle cylinder 15 to return to its original position. When the baffle cylinder 15 returns to its original position, it drives the cleaning ring 13 to move. The cleaning ring 13 is located on the top edge of the baffle cylinder 15. The cleaning ring 13 moves with the baffle cylinder 15 to clean the metal particles on the main shield 8, preventing large particles from adhering to the main shield 8. Metal particles affect the heat dissipation efficiency of the main shield 8. The outer wall of the cleaning ring 13 is pressed against the inner wall of the main shield 8. The top of the baffle cylinder 15 is provided with a protruding edge 12, which is used to block metal particles and prevent them from moving along the top of the cleaning ring 13 and falling onto the stationary contact 16, causing poor contact between the stationary contact 16 and the moving contact 17. Multiple slag grooves 14 are provided between the protruding edge 12 and the baffle cylinder 15 in an annular and equidistant manner. The metal particles swept down by the cleaning ring 13 will fall into the baffle cylinder 15 through the slag grooves 14. The outer side of the moving conductive rod 5 is symmetrically fixed with an L-shaped rod 11. When the moving conductive rod 5 moves downward, the moving conductive rod 5 drives the L-shaped rod 11. 1. The moving contact 17 moves downward, and the L-shaped rod 11 moves the baffle cylinder 15 downward through the protruding edge 12. When one end of the stationary contact 16 protrudes from the baffle cylinder 15, the moving contact 17 will contact the stationary contact 16. Therefore, the main shield 8 can absorb arc energy and dissipate heat through thermal radiation, thereby shortening the arc extinguishing time. The L-shaped rod 11, the protruding edge 12 and the baffle cylinder 15 are all made of insulating material. The bottom of the L-shaped rod 11 abuts against the top of the protruding edge 12. A secondary shield 7 is installed on the outside of the moving conductive rod 5. The secondary shield 7 can not only protect the bellows 6, but also prevent metal particles from flying out from the upper opening of the main shield 8, thus preventing metal particles from splashing onto the inner wall of the ceramic shell 1.

[0020] The outer wall of the secondary shield 7 abuts against the inner wall of the main shield 8, preventing metal particles generated during the opening and closing of the moving contact 17 and the stationary contact 16 from flying out of the main shield 8 through the gap between the secondary shield 7 and the main shield 8.

[0021] The cleaning ring 13 is made of silicone rubber, which has high elasticity and can fully contact the inner wall of the main shield 8, thus ensuring the cleaning effect of the cleaning ring 13. In addition, silicone rubber is not only resistant to high temperature, but also has excellent electrical insulation and strong arc resistance, ensuring its long service life. The top of the cleaning ring 13 is provided with a slope. The metal particles swept off the inner wall of the main shield 8 by the cleaning ring 13 will roll along the slope and fall into the baffle cylinder 15 through the slag trough 14 for collection.

[0022] Among them, a bellows 6 is installed on the outside of the moving conductive rod 5. The bellows 6 is used to provide a dynamic seal between the moving conductive rod 5 and the moving end cover plate 4, ensuring that the high vacuum environment inside the ceramic shell 1 is not damaged. One end of the bellows 6 is connected to the moving end cover plate 4, and the other end of the bellows 6 is connected to the moving conductive rod 5.

[0023] The top of the spring 10 abuts against the bottom of the baffle cylinder 15, and the bottom of the spring 10 abuts against the top of the stationary end cover plate 2.

[0024] The bottom of the L-shaped rod 11 is provided with a groove 18, which makes the L-shaped rod 11 fit more closely with the convex edge 12 and prevents the L-shaped rod 11 from shifting when pushing the convex edge 12.

[0025] Specifically, during use, the moving conductive rod 5 moves downward under the action of the external operating mechanism. The moving conductive rod 5 drives the moving contact 17 and the L-shaped rod 11 to move downward. The L-shaped rod 11 pushes the baffle cylinder 15 downward through the protruding edge 12. The baffle cylinder 15 compresses the spring 10. Only when one end of the stationary contact 16 protrudes from the baffle cylinder 15 will the moving contact 17 contact the stationary contact 16, thereby ensuring that the main shielding cover 8 can absorb arc energy and dissipate heat through thermal radiation, thus shortening the arc extinguishing time. The metal particles generated at the moment of opening and closing of the moving contact 17 and the stationary contact 16 will... Blocked by the baffle cylinder 15, cleaning ring 13 and secondary shield 7, metal particles cannot fly out from the upper and lower openings of the main shield 8, thus preventing the ceramic shell 1 from being contaminated by metal particles. When the moving conductive rod 5 moves upward under the action of the external operating mechanism, the spring 10 will spring open and reset, pushing the baffle cylinder 15 to move upward. The baffle cylinder 15 drives the cleaning ring 13 to move upward. The cleaning ring 13 cleans the surface of the main shield 8. The swept-off metal particles will move along the top slope of the cleaning ring 13 and fall into the interior of the baffle cylinder 15 through the slag trough 14.

[0026] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum interrupter for a circuit breaker, comprising a ceramic housing (1), a moving end cover plate (4) disposed on the top of the ceramic housing (1), and a stationary end cover plate (2) disposed on the bottom of the ceramic housing (1), wherein a moving conductive rod (5) is slidably mounted in the middle of the moving end cover plate (4), one end of the moving conductive rod (5) extends through the moving end cover plate (4) into the interior of the ceramic housing (1), a stationary conductive rod (9) is fixedly connected in the middle of the stationary end cover plate (2), one end of the stationary conductive rod (9) extends through the stationary end cover plate (2) into the interior of the ceramic housing (1), a moving contact (17) and a stationary contact (16) are respectively mounted on adjacent ends of the moving conductive rod (5) and the stationary conductive rod (9), a stationary conductive block (3) is connected to the bottom of the stationary conductive rod (9), and a main shielding cover (8) is installed on the inner wall of the ceramic housing (1), characterized in that: A baffle cylinder (15) is slidably installed on the outside of the static conductive rod (9). A spring (10) is sleeved on the outside of the static conductive rod (9). A cleaning ring (13) is provided on the top edge of the baffle cylinder (15). The outer side wall of the cleaning ring (13) abuts against the inner side wall of the main shield (8). A protruding edge (12) is provided on the top of the baffle cylinder (15). Multiple slag grooves (14) are provided between the protruding edge (12) and the baffle cylinder (15) in an annular and equidistant arrangement. An L-shaped rod (11) is symmetrically fixedly connected to the outside of the moving conductive rod (5). The bottom of the L-shaped rod (11) abuts against the top of the protruding edge (12). A secondary shield (7) is installed on the outside of the moving conductive rod (5).

2. The vacuum interrupter for a circuit breaker according to claim 1, characterized in that: The outer wall of the secondary shield (7) abuts against the inner wall of the main shield (8).

3. A vacuum interrupter for a circuit breaker according to claim 1, characterized in that: The cleaning ring (13) is made of silicone rubber, and the top of the cleaning ring (13) is provided with a slope.

4. A vacuum interrupter for a circuit breaker according to claim 1, characterized in that: A bellows (6) is installed on the outside of the moving conductive rod (5). One end of the bellows (6) is connected to the moving end cover plate (4), and the other end of the bellows (6) is connected to the moving conductive rod (5).

5. A vacuum interrupter for a circuit breaker according to claim 1, characterized in that: The top of the spring (10) abuts against the bottom of the baffle cylinder (15), and the bottom of the spring (10) abuts against the top of the stationary end cover plate (2).

6. A vacuum interrupter for a circuit breaker according to claim 1, characterized in that: The bottom of the L-shaped rod (11) is provided with a groove (18).

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