阅读说明：本技术 一种用于断路器的隔离式触头机构 (Isolated contact mechanism for circuit breaker ) 是由 王慧德 徐�明 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种用于断路器的隔离式触头机构,其包括导电棒、绝缘套、绝缘座和动触头；所述动触头铰接在所述绝缘座上,所述绝缘座上设有滑动导槽和开设在所述滑动导槽上的导电开口,所述导电棒的一端可在所述滑动导槽内滑动并可通过所述导电开口与所述动触头电接触,所述导电棒上至少有一部分的外表面套设有绝缘套,当所述导电棒的一端伸入所述滑动导槽内自所述导电开口离开,所述绝缘套遮挡所述导电开口。本发明抛弃现有采用空气作为绝缘介质的设计方案,采用了绝缘材料物理隔离的方式进行切断电弧,即断路器在短路分断时,在断路器的动触头和静触头之间用绝缘材料完全隔离。(The invention discloses an isolated contact mechanism for a circuit breaker, which comprises a conductive rod, an insulating sleeve, an insulating seat and a moving contact, wherein the conductive rod is arranged on the insulating sleeve; the moving contact is hinged to the insulating seat, a sliding guide groove and a conductive opening are formed in the sliding guide groove, one end of the conductive rod can slide in the sliding guide groove and can be in electrical contact with the moving contact through the conductive opening, an insulating sleeve is sleeved on at least one part of the outer surface of the conductive rod, when one end of the conductive rod extends into the sliding guide groove and leaves from the conductive opening, and the conductive opening is shielded by the insulating sleeve. The invention abandons the existing design scheme of adopting air as an insulating medium, and adopts a physical isolation mode of an insulating material to cut off electric arcs, namely, when the breaker is in short-circuit breaking, the moving contact and the static contact of the breaker are completely isolated by the insulating material.)

1. An isolated contact mechanism for a circuit breaker, comprising: the device comprises a conductive rod, an insulating sleeve, an insulating seat and a moving contact; the moving contact is hinged to the insulating seat, a sliding guide groove and a conductive opening are formed in the sliding guide groove, one end of the conductive rod can slide in the sliding guide groove and can be in electrical contact with the moving contact through the conductive opening, an insulating sleeve is sleeved on at least one part of the outer surface of the conductive rod, when one end of the conductive rod extends into the sliding guide groove and leaves from the conductive opening, and the conductive opening is shielded by the insulating sleeve.

2. An isolating contact mechanism for a circuit breaker as claimed in claim 1, wherein: the conductive opening is a notch arranged at the opening end of the sliding guide groove.

3. an isolating contact mechanism for a circuit breaker as claimed in claim 1, wherein: the conducting rod is provided with a large head end and a small head end, the insulating sleeve is sleeved on the small head end, and the periphery of the insulating sleeve is flush with the periphery of the large head end of the conducting rod.

4. An isolating contact mechanism for a circuit breaker according to claim 1 or 3, wherein: the contact part of the conducting rod and the moving contact can be set to be a plane.

5. An isolating contact mechanism for a circuit breaker as claimed in claim 1, wherein: and a guide mechanism is arranged between the conductive rod and the sliding guide groove of the insulating seat.

6. An isolating contact mechanism for a circuit breaker as claimed in claim 5, wherein: the guide mechanism is at least one group of mutually matched planes along the sliding direction.

7. An isolating contact mechanism for a circuit breaker as claimed in claim 1, wherein: the insulating sleeve and/or the insulating base are/is made of plastic or ceramic materials.

Technical Field

The invention relates to an isolated contact mechanism for a circuit breaker, which shortens the extinguishing time of an electric arc between contact pairs when the circuit breaker is in short-circuit breaking, inhibits the increase of the energy of the electric arc, and improves the short-circuit breaking capacity and reliability of the circuit breaker.

Background

The internal structure of the current circuit breaker generally comprises a group of moving and static contact pairs, a group of arc extinguishing grid plate groups, a coil tripping mechanism and an overload tripping mechanism. When the circuit has overload fault, the overload tripping mechanism acts to drive the contact mechanism to open, when the circuit has short-circuit fault, the coil tripping mechanism acts to drive the contact mechanism to open, an arc guiding runway is arranged between the arc extinguishing grid sheet set and the contact pair, and when the contact pair opens, the arc enters the arc extinguishing grid sheet set along the arc guiding runway to extinguish.

The most obvious characteristic of current circuit breaker structure is that through the air as insulating medium during the separating brake, at heavy current separating brake in-process sound contact to can produce the electric arc of big energy, this electric arc from producing to being extinguished by arc extinguishing bars piece group needs longer time, and electric arc can cause irreversible damage even causes the conflagration to the circuit breaker in this in-process.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an isolated contact mechanism for a circuit breaker.

The technical scheme adopted by the invention for solving the technical problems is as follows:

An isolated contact mechanism for a circuit breaker, comprising: the device comprises a conductive rod, an insulating sleeve, an insulating seat and a moving contact; the moving contact is hinged to the insulating seat, a sliding guide groove and a conductive opening are formed in the sliding guide groove, one end of the conductive rod can slide in the sliding guide groove and can be in electrical contact with the moving contact through the conductive opening, an insulating sleeve is sleeved on at least one part of the outer surface of the conductive rod, when one end of the conductive rod extends into the sliding guide groove and leaves from the conductive opening, and the conductive opening is shielded by the insulating sleeve.

In another preferred embodiment, the conductive opening is a notch provided at an open end of the sliding guide groove.

In another preferred embodiment, the conductive rod has a large end and a small end, the insulating sleeve is sleeved on the small end, and the periphery of the insulating sleeve is flush with the periphery of the large end of the conductive rod.

In another preferred embodiment, a portion of the conductive rod, which is in contact with the movable contact, may be set to be a flat surface.

In another preferred embodiment, a guide mechanism is arranged between the conductive rod and the sliding guide groove of the insulating seat.

In another preferred embodiment, the guiding means are at least one set of mutually cooperating flat surfaces in the sliding direction.

In another preferred embodiment, the insulating sleeve and/or the insulating base are made of plastic or ceramic material.

The invention has the beneficial effects that:

1. The invention abandons the existing design scheme of adopting air as an insulating medium, and adopts a physical isolation mode of an insulating material to cut off electric arcs, namely when the breaker is in short-circuit breaking, the moving contact and the static contact of the breaker are completely isolated by the insulating material (such as insulator materials of plastics, ceramics and the like), specifically, a sliding guide groove and a conductive opening are arranged on an insulating seat, an insulating sleeve is sleeved on a conductive rod, when the circuit is in short circuit, the conductive rod is driven by electromagnetism, one end of the conductive rod, which is in contact with the moving contact, extends into the sliding guide groove, and the insulating sleeve replaces the position of the original conductive rod to rapidly isolate the conductive rod from the moving contact, thereby cutting off the path of the electric arcs and leading the electric arcs to. The short-circuit breaking capacity of the circuit breaker is improved, and the reliability of the circuit breaker is improved; and an arc extinguishing grid group is not required to be installed, so that the size of the circuit breaker is reduced, and the cost of the circuit breaker is reduced.

2. The periphery of the insulating sleeve is flush with the periphery of the large end of the conductive rod, so that the sliding is more reliable.

3. The contact part of the conducting rod and the moving contact is designed to be a plane, so that the stability of electric contact is improved.

4. The guide mechanism provides the guide on the sliding stroke, and at least one group of mutually matched planes in the sliding direction are used by the guide mechanism, so that the structure is reasonable, and the action is reliable.

The invention is further explained in detail with the accompanying drawings and the embodiments; an isolating contact mechanism for a circuit breaker of the present invention is not limited to the embodiments.

Drawings

fig. 1 is a schematic structural diagram of an isolated contact mechanism according to a preferred embodiment of the invention.

Fig. 2 is a schematic cross-sectional view of an isolated contact mechanism in a closed state according to a preferred embodiment of the invention.

Fig. 3 is a schematic cross-sectional view of an isolated contact mechanism of a preferred embodiment of the present invention at the instant of short circuit trigger.

Fig. 4 is a schematic cross-sectional view of an isolated contact mechanism at the moment of short circuit disconnection in accordance with a preferred embodiment of the present invention.

Fig. 5 is a cross-sectional view of the isolating contact mechanism in an open state according to a preferred embodiment of the invention.

Fig. 6 is a schematic structural diagram of an isolated contact mechanism applied to a circuit breaker according to a preferred embodiment of the invention, wherein the circuit is in a closed state.

Fig. 7 is a schematic diagram of the structure of the isolating contact mechanism according to a preferred embodiment of the present invention applied to a circuit breaker, when the circuit is in a short circuit trip instant.

Fig. 8 is a schematic structural diagram of the isolating contact mechanism according to a preferred embodiment of the present invention applied to a circuit breaker, wherein the circuit is in an open state.

Detailed Description