Insulating pull rod for reducing contact bounce of vacuum circuit breaker

Abstract

An insulating pull rod for reducing bounce of a vacuum circuit breaker contact comprises an insulating body, a first metal sleeve and a second metal sleeve are embedded in the two ends of the insulating body respectively, the first metal sleeve is filled with damping particles, the damping particles are packaged in the first metal sleeve through a first pressing ring, and the center of the first pressing ring is fixedly connected with a first connecting rod; a spring is sleeved with the second metal sleeve, a second connecting rod is installed in the second metal sleeve in a pressed mode through a second pressing ring, the upper portion of the second connecting rod abuts against the top of the spring, and the lower portion of the second connecting rod extends into an inner cavity of the spring. According to the utility model, the damping particles filled at the lower end of the insulating pull rod absorb and disperse the bounce at the moment of contact of the moving contact, and rebounding of the moving contact is inhibited, thereby reducing bounce of the contact of the vacuum circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and in particular relates to an insulating pull rod for reducing the bounce of vacuum circuit breaker contacts. Background Technology

[0002] The insulating pull rod (also known as the insulating operating rod or insulating connecting rod) in a vacuum circuit breaker is one of the core transmission components. Its main responsibility is to transmit the opening / closing power between the mechanical operating mechanism and the vacuum interrupter, while ensuring electrical insulation between the high-voltage energized parts and the operating mechanism. In existing technology, to suppress the bounce phenomenon when the contacts close (i.e., multiple collisions at the moment of contact), contact springs are mostly installed on the insulating pull rod to suppress bounce. The contact spring continues to apply force to the moving contact after the moving and stationary contacts have made contact, giving the moving contact a larger contact pressure and reducing bounce when the moving and stationary contacts close. The specific principle is: when the moving contact is bounced open, the contact spring is compressed. If this rebound force is less than the contact spring force, the moving contact will not be bounced open; if the rebound force is greater than the contact spring force, the moving contact will be bounced open. Therefore, increasing the contact spring force can suppress bounce. However, the magnitude of the contact spring force is determined by the electrodynamic force of the circuit breaker's dynamic stability current. Increasing the contact spring force to suppress bounce is unreasonable. It will bring the following adverse consequences: 1) Increase the closing energy, making the operating mechanism larger; 2) Increase the impact of the opening and closing action of the mechanism, affecting the life and reliability of the operating mechanism; 3) Increase the impact on the arc-extinguishing chamber, affecting the life and reliability of the arc-extinguishing chamber. Summary of the Invention

[0003] This invention provides an insulating pull rod to reduce the bounce of vacuum circuit breaker contacts, thus overcoming the shortcomings of the prior art.

[0004] The technical solution adopted by this utility model is: an insulating pull rod for reducing the bounce of vacuum circuit breaker contacts, comprising an insulating body, with a metal sleeve one and a metal sleeve two respectively embedded at both ends of the insulating body. The metal sleeve one is filled with damping particles, and the damping particles are sealed inside the metal sleeve one by a pressure ring one. A connecting rod one is fixedly connected to the center of the pressure ring one. A spring is fitted inside the metal sleeve two, and a connecting rod two is pressed in by the pressure ring two, with the upper part of the connecting rod two abutting against the top of the spring and the lower part extending into the inner cavity of the spring.

[0005] The damping particles are filled to 1 / 2 to 1 / 3 of the volume of the metal sleeve.

[0006] The damping particles are iron scraps or small iron beads.

[0007] The inner end of the connecting rod extends to the top of the metal sleeve and is fixedly connected to the top of the metal sleeve.

[0008] The pressure ring is fitted onto the connecting rod and then threadedly connected to the metal sleeve to form a single unit.

[0009] The upper periphery of the connecting rod 2 has an annular boss, and a pressure ring 2 is fitted on the top of the annular boss. The lower end of the connecting rod 2 is pressed into the metal sleeve 2 by the threaded connection between the pressure ring 2 and the metal sleeve 2, and the lower end of the annular boss abuts against the top of the spring.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. This utility model reduces the bounce of vacuum circuit breaker contacts by absorbing and dispersing the rebound force of the moving contact at the moment of contact through damping particles filled at the lower end of the insulating tie rod.

[0012] 2. In this invention, at the moment of contact between the moving and stationary contacts, the damping particles can reduce the excessive impact of the moving contact on the stationary contact, thereby protecting the smooth and flat surfaces of the moving and stationary contacts and ensuring low contact resistance and stable current carrying capacity. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1 The present invention will be described in detail with reference to specific embodiments.

[0015] An insulating pull rod for reducing contact bounce in a vacuum circuit breaker includes an insulating body 1. Two metal sleeves, a first metal sleeve 2 and a second metal sleeve 3, are respectively embedded at both ends of the insulating body 1. The first metal sleeve 2 is filled with damping particles 4, which are encapsulated within it by a pressure ring 5. A connecting rod 6 is fixedly connected to the center of the pressure ring 5. A spring 7 is fitted inside the second metal sleeve 3, and a connecting rod 8 is press-fitted into the second metal sleeve 3 by a pressure ring 9. The upper part of the connecting rod 8 rests against the top of the spring 7, and the lower part extends into the inner cavity of the spring 7.

[0016] When the insulating body 1 is subjected to the rebound force at the moment of contact of the moving contact, the damping particles collide and rub, converting mechanical energy into heat energy and sound energy, generating a damping effect, thereby absorbing and dispersing the reaction force of the moving contact. This absorption and dispersion effect suppresses the rebound of the moving contact; at the same time, the momentum exchange between the damping particles and the insulating body 1 can also play a role in suppressing vibration, thereby achieving the purpose of reducing the bounce of the vacuum circuit breaker contacts.

[0017] In addition, at the moment of contact between the moving and stationary contacts, the damping particles can reduce the excessive impact of the moving contact on the stationary contact, thereby protecting the smooth and flat surfaces of the moving and stationary contacts and ensuring low contact resistance and stable current carrying capacity.

[0018] In one embodiment, the damping particles 4 are broken iron pieces or small iron beads. The filling amount of the damping particles 4 is 1 / 2 to 1 / 3 of the volume of the metal sleeve 2. A buffer space is reserved in the inner cavity of the metal sleeve 2. When the broken iron pieces or small iron beads are subjected to impact force, they can move freely in the buffer space, thereby further reducing the transmission of the reaction force of the moving contact. This design makes the contact between the moving and stationary contacts more stable and reduces the reverse impact of the moving contact on the insulating rod.

[0019] In the above embodiments, in order to increase the stability of the connecting rod, the inner end of the connecting rod 6 extends through the pressure ring 5 to the top of the metal sleeve 2 and is fixedly connected to the top of the metal sleeve 2; the pressure ring 5 is fitted on the connecting rod 6 and threadedly connected to the metal sleeve 2.

[0020] Specifically, the top of the metal sleeve 2 is threaded or welded to the connecting rod 6; after the pressure ring 5 is threadedly connected to the metal sleeve 2, the pressure ring 5 is welded to the connecting rod 6 of the set as a whole.

[0021] In the above embodiment, the upper inner end of the connecting rod 8 has an annular flange 8-1, and a pressure ring 9 is fitted on the upper edge of the annular flange 8-1. The lower end of the connecting rod 8 is pressed into the metal sleeve 3 by the threaded connection between the pressure ring 9 and the metal sleeve 3, and the lower end of the annular flange 8-1 abuts against the top of the spring 7.

[0022] In use, the first connecting rod 6 is connected to the operating mechanism of the circuit breaker, and the second connecting rod 8 is connected to the moving contact of the circuit breaker. When the circuit breaker closes, the damping particles absorb and disperse the rebound force of the moving contact at the moment of contact, suppressing the rebound of the moving contact and thus reducing the bounce of the vacuum circuit breaker contacts. At the same time, under the action of inertia, the damping particles continue to move upward, increasing the contact pressure applied to the moving contact by the contact spring 7 through the insulating body 1, further reducing the rebound of the moving contact.

[0023] This invention reduces the reaction force of the moving contact, resulting in less bounce in the vacuum circuit breaker, reduced electrical wear of the vacuum circuit breaker contacts, and improved electrical life of the arc-extinguishing chamber.

[0024] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent variations made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. An insulating pull rod for reducing contact bounce in a vacuum circuit breaker, comprising an insulating body (1), characterized in that: The insulating body (1) has metal sleeve one (2) and metal sleeve two (3) embedded at both ends respectively. The metal sleeve one (2) is filled with damping particles (4), and the damping particles (4) are sealed in the metal sleeve one (2) by pressure ring one (5). A connecting rod one (6) is fixedly connected to the center of the pressure ring one (5). A spring (7) is fitted inside the metal sleeve two (3), and a connecting rod two (8) is pressed in by pressure ring two (9). The upper part of the connecting rod two (8) abuts against the top of the spring (7), and the lower part extends into the inner cavity of the spring (7).

2. An insulating pull rod for reducing contact bounce in a vacuum circuit breaker according to claim 1, characterized in that: The amount of damping particles (4) is 1 / 2 to 1 / 3 of the volume of the metal sleeve (2).

3. The insulating tie rod for reducing contact bounce of a vacuum circuit breaker according to claim 2, characterized in that: The damping particles (4) are broken iron pieces or small iron beads.

4. An insulating pull rod for reducing contact bounce in a vacuum circuit breaker according to claim 1, characterized in that: The inner end of the connecting rod (6) extends to the top of the metal sleeve (2) and is fixedly connected to the top of the metal sleeve (2).

5. An insulating pull rod for reducing contact bounce in a vacuum circuit breaker according to claim 1, 2, 3, or 4, characterized in that: The pressure ring (5) is fitted onto the connecting rod (6) and then threadedly connected to the metal sleeve (2) to be fixed as one unit.

6. An insulating pull rod for reducing contact bounce in a vacuum circuit breaker according to claim 1, characterized in that: The upper periphery of the connecting rod 2 (8) has an annular boss (8-1), and a pressure ring 2 (9) is fitted on the annular boss (8-1). The lower end of the connecting rod 2 (8) is pressed into the metal sleeve 2 (3) by the threaded connection between the pressure ring 2 (9) and the metal sleeve 2 (3), and the lower end of the annular boss (8-1) abuts against the top of the spring (7).

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