Operating mechanism of circuit breaker

Patent metadata

Field	Value
Publication number	US-10276330-B2
Application number	US-201515506933-A
Country	US
Kind code	B2
Filing date	Jan 28, 2015
Priority date	Aug 27, 2014
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

An operating mechanism of a circuit breaker comprising a static contact, a movable contact provided on a contact support and an operating handle that is in linkage with the contact support; a rotation shaft of the movable contact is concentric with a rotation shaft of the contact support, and the movable contact and the contact support are fixedly connected via an elastic component; the movable contact is capable of rotating relative to the contact support. The operating mechanism improves the response velocity of the movable contact.

First claim

The invention claimed is:

1. An operating mechanism of a circuit breaker, comprising: a static contact, a movable contact provided on a contact support and an operating handle that is in linkage with the contact support, wherein a rotation shaft of the movable contact is concentric with a rotation shaft of the contact support, and the movable contact and the contact support are fixedly connected via an elastic component; and wherein the movable contact is capable of rotating relative to the contact support.

2. The operating mechanism of the circuit breaker according to claim 1 , wherein a conductive contact point matched with the static contact is provided at one end of the movable contact; a rotation hole is formed in the other end of the movable contact; the contact support is provided with a cylindrical lug boss at a rotation axis thereof, and the rotation hole is in sleeve joint to the lug boss; the elastic component comprises a releasing spring which is in sleeve joint to the lug boss, and two ends of the releasing spring are fixed onto the contact support and the movable contact respectively.

3. The operating mechanism of the circuit breaker according to claim 2 , wherein an edge, opposite the movable contact point, of the rotation hole is provided with a raised column body, and a spring slot which is in contact and fixed with the releasing spring is provided at one side of the column body.

4. The operating mechanism of the circuit breaker according to claim 3 , wherein the movable contact comprises a disc which is hollowed at an axis thereof to form the rotation hole; a trigger lever extends from the edge of the disc, and the movable contact point is formed at the end portion of the trigger lever; the edge, away from the trigger lever, of the disc is provided with the column body, a bump is provided at one side of the top of the column body, and the spring slot is formed in one side, corresponding to the column body, of the bump; a limiting surface is formed at the other side of the column body; the trigger lever and the disc are fixed on the same plane; the column body and the disc are fixed vertically.

5. The operating mechanism of the circuit breaker according to claim 4 , wherein the contact support is provided with a ring slot where the disc of the movable contact is placed, around the rotation shaft; a first notch and a second notch are provided at positions, avoiding the column body and the trigger lever, of the ring slot respectively; a locating surface is provided at one end, opposite to the limiting surface, of the first notch; a spring pillar is provided at a position, adjoining to the locating surface, on the edge of the ring slot; and a fixing slot which is recessed inwardly, and penetrates through a part of the slot wall of the ring slot and is used for fixing the end portion of the releasing spring is provided in one side, departing from the locating surface, of the spring pillar.

6. The operating mechanism of the circuit breaker according to claim 5 , wherein a clamping slot which penetrates through the slot wall of the ring slot is provided at a bottom of the second notch in a releasing rotation direction of the trigger lever; a limiting portion for preventing the trigger lever from dropping along the axial direction is formed at the slot wall portion of the ring slot at the top of the clamping slot; and wherein the movable contact is capable of rotating inside a space defined by the first notch and the second notch relative to the contact support.

7. The operating mechanism of the circuit breaker according to claim 5 , wherein an inclined introduction surface is provided at one end, facing to the fixing slot, at the top of the spring pillar; and wherein a supporting plate for supporting the trigger lever is formed by extending outwards from a position, where the second notch is located, at the bottom of the ring slot.

8. The operating mechanism of the circuit breaker according to claim 1 , wherein the contact support further comprises a mechanical interlocking rotation shaft and a lock catch rotation shaft; the operating mechanism further comprises a transmission link, a mechanical interlocking device, a lock catch, and a releasing device matched with the lock catch to realize a releasing action of the circuit breaker; further wherein the mechanical interlocking device and the lock catch are pivotally provided on the mechanical interlocking rotation shaft and the lock catch rotation shaft of the contact support respectively; one end of the mechanical interlocking device is in hinged connection to the operating handle through the transmission link; the other end of the mechanical interlocking device is connected with a hasp of the lock catch.

9. The operating mechanism of the circuit breaker according to claim 8 , wherein the releasing device comprises an electromagnetic releasing module which comprises a striker, the striker is in contact and fixed with a movable iron core of the electromagnetic releasing module under the extrusion of an acting spring, and the striker can be popped up to strike the lock catch, such that the mechanical interlocking device is separated from the hasp of the lock catch.

10. The operating mechanism of the circuit breaker according to claim 8 , wherein the releasing device comprises a thermal overload releasing module, wherein the thermal overload releasing module comprises a bimetallic strip that is deformable according to the temperature change; further wherein a releasing link is provided on the lock catch; the bimetallic strip is connected with the releasing link, such that the mechanical interlocking device is separated from the hasp of the lock catch.

Assignees

• Zhejiang Chint Electrics Co Ltd

Inventors

• Yang Feng
• Jiang Yukun
• Si Yingge

Classifications

• H01H2235/01

  Spiral spring · CPC title

• H01H71/16

  with bimetal element {(combined with detection of imbalance of two or more currents H01H83/223)} · CPC title

• H01H71/24

  Electromagnetic mechanisms · CPC title

• H01H71/526 Primary

  the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure · CPC title

• H01H21/30 Primary

  not biased to return to a normal position upon removal of operating force · CPC title