CN210040106U - Contact mechanism of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model discloses a circuit breaker of contact mechanism of circuit breaker and applied this contact, circuit breaker include casing, incoming line terminal, contact mechanism, leading-out terminal, shunt release coil install in the casing, and contact mechanism includes moving contact, static contact, contact driving medium, and static contact one side has the centre gripping groove, and the moving contact lower part is located the centre gripping inslot of static contact, and the upper end of moving contact links to each other with the contact driving medium, and the incoming line terminal links to each other with contact mechanism's static contact, leading-out terminal links to each other with the moving contact, under the closed condition, the lower part of moving contact is inserted in the centre gripping groove of static contact. N looks circuit breaker needs to assist the arc extinguishing through devices such as arc extinguishing bars piece group among the prior art, and the unable arc of solving produces, the utility model discloses a contact mechanism that has clamping function, the static contact is pressed from both sides the moving contact tightly under the on-state, avoids the separation production electric arc of static contact, moving contact, improves the reliability of circuit breaker.

Description

Contact mechanism of circuit breaker and circuit breaker

Technical Field

The utility model relates to a contact mechanism of circuit breaker especially relates to a N looks contact mechanism with clamping function, belongs to circuit breaker technical field.

Background

In a terminal circuit of a power distribution grid, a 1P + N miniature circuit breaker is often used as a circuit protection circuit breaker, such as a 1P + N miniature leakage circuit breaker, a 1P + N prepaid smart trip miniature circuit breaker, a 1P + N smart reclosing miniature circuit breaker, and the like. The 1P + N miniature circuit breaker consists of an L pole and an N pole, wherein the L pole is a common miniature circuit breaker with short-circuit protection and overload protection functions; the N pole does not have short circuit and overload protection functions, only can be used for switching on and off the circuit, and weak current components such as a PCB (printed circuit board), a shunt release or a reclosing motor gear set and the like are usually placed in the N pole (as shown in figure 1).

The existing 1P + N miniature circuit breaker has a main failure mode that when the circuit breaker performs short-circuit breaking under short-circuit current, an N-pole PCB, a shunt coil and the like are burnt and failed by electric arcs generated between N-pole contacts or the N-pole contacts are burnt by the electric arcs to cause non-conduction. Although the N pole contacts usually have the function of closing first and then separating, the electric arc generated between the N pole contacts cannot be completely eradicated, and the function of closing first and then separating is weakened or even eliminated under the condition that the N pole contacts are burnt. Therefore, short circuit arc between N pole contacts is a main factor causing damage failure of the 1P + N miniature circuit breaker.

Disclosure of Invention

The utility model provides a contact mechanism of circuit breaker to solve the problem that N looks contact mechanism can't effectively avoid the electric arc harm among the prior art at least.

The utility model discloses a contact mechanism of circuit breaker, including moving contact, static contact, contact driving medium, static contact one side has the centre gripping groove, the moving contact lower part is located the centre gripping inslot of static contact, the upper end of moving contact links to each other with the contact driving medium.

Furthermore, the static contact is a U-shaped clamping plate, and the moving contact is a single copper plate.

The utility model also discloses a circuit breaker of using above-mentioned contact mechanism, including casing, incoming line terminal, contact mechanism, leading-out terminal, shunt release coil install in the casing, the incoming line terminal links to each other with contact mechanism's static contact, leading-out terminal links to each other with the moving contact, under the closed condition, the lower part of moving contact is inserted in the centre gripping groove of static contact.

Furthermore, the circuit breaker also comprises a PCB circuit board, wherein the PCB circuit board is arranged in the shell and is connected with the moving contact in series.

Furthermore, the PCB circuit board is a leakage protection circuit board.

Compared with the prior art, the utility model, adopt centre gripping formula contact structure, the centre gripping groove that utilizes the static contact carries out the centre gripping to the moving contact fixed, when the circular telegram, the structure that the static contact is located centre gripping groove both sides has the syntropy electric current, two adjacent wire electric current syntropies inhale mutually in electromagnetic mechanics, the principle that the heterodromous is repelled mutually, the structure on centre gripping groove both sides is pressed close to in opposite directions, it is fixed to carry out the centre gripping to the moving contact, it is outdated to make the electric current, the static contact can't separate with the moving contact, thereby avoid the production of short circuit in-process electric arc, and then effectively solve the damage of electric arc to.

Drawings

Fig. 1 is a schematic structural diagram of a conventional N-phase circuit breaker;

fig. 2 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of the moving contact and the static contact in the clamping state according to the embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The embodiment of the utility model discloses contact mechanism of circuit breaker, as shown in fig. 3, including moving contact 41, static contact 42, contact driving medium 43, static contact 42 one side has the centre gripping groove, moving contact 41 lower part is located the centre gripping inslot of static contact 42, moving contact 41's upper end links to each other with contact driving medium 43.

Optionally, the fixed contact 42 is a U-shaped clamp plate, and the movable contact 41 is a single copper plate.

The embodiment of the utility model provides a still disclose a circuit breaker of using above-mentioned contact mechanism, as shown in fig. 2, including casing 1, incoming line terminal 2, contact mechanism, leading-out terminal 3, shunt release coil 5 install in casing 1, incoming line terminal 2 links to each other with contact mechanism's static contact 42, leading-out terminal 3 links to each other with moving contact 41, under the closure state, moving contact 41's lower part is inserted in static contact 42's centre gripping groove.

Optionally, the circuit breaker further includes a PCB circuit board 6, the PCB circuit board 6 is installed in the housing 1, and the PCB circuit board 6 is connected in series with the moving contact 41.

Specifically, the PCB 6 is a leakage protection circuit board 6.

The contact mechanism further comprises a toggle switch 7, the toggle switch 7 is mounted on the housing 1 and connected with the contact transmission member 43, and in the process of opening and closing the toggle switch 7, the movable contact 41 and the fixed contact 42 can be closed or separated through the contact transmission member 43. The shunt tripping coil 5 is a shunt tripping device, and the extending end of the shunt tripping device faces the contact transmission member 43, and when the shunt tripping device is disconnected, the extending end of the shunt tripping device extends out and pushes the contact transmission member 43, so that the contact transmission member 43 drives the moving contact 41 to be separated from the static contact 42, and the disconnection is realized.

The embodiment of the utility model provides an in, the contact mode of centre gripping formula contact structure sound contact is similar with knife switch, and the static contact is a U type splint promptly, and the moving contact is the monolithic copper, and in the moving contact inserted U type splint under contact mechanism's drive during the combined floodgate, circuit current was collected in moving contact department again after U type splint department was divided into two the tunnel after incoming line terminal connects into to flow to outgoing line terminal all the way is synthesized. According to the principle that currents of two adjacent wires are attracted in the same direction and repelled in different directions in electromagnetics, a larger current flows through two arms of a U-shaped clamping plate of a static contact when in short circuit, and the currents in the same direction on the two arms can enable the two arms of the clamping plate to generate clamping force to clamp a moving contact. The electromagnetic clamping force on the U-shaped clamping plate of the static contact disappears until the short-circuit current is cut off, and at the moment, the moving contact can be opened under the action of the contact spring. Because the embodiment of the utility model provides a circuit breaker is whole short circuit breaking process in-process sound contact and static contact do not separate completely, makes not produce electric arc between the movable contact and the static contact, has avoided N utmost point electric arc to the damage of relevant spare part completely, and the electric arc between the N utmost point contact when restraining the short circuit breaking avoids the scaling loss of components such as N utmost point contact and PCB circuit board. Because the N utmost point does not produce electric arc simultaneously, compare in the current design in fig. 1, the utility model discloses the circuit breaker also needn't install the arc extinguishing bars group that is used for supplementary arc extinguishing, vacates bigger space for circuit breaker inside and is used for placing of circuit board or other functional parts, or realizes the reduction to the circuit breaker volume, realizes the simplification and the minification of circuit breaker structure.

The embodiment of the utility model provides an adopt centre gripping formula contact structure, it is fixed to utilize the centre gripping groove of static contact to carry out the centre gripping to the moving contact, when the circular telegram, the structure that the static contact is located centre gripping groove both sides has the syntropy electric current, two adjacent wire electric currents syntropy attract each other in electromagnetic mechanics, the principle that the heterodromous is repelled, the structure on centre gripping groove both sides is pressed close to in opposite directions, it is fixed to carry out the centre gripping to the moving contact, it is outdated to make the electric current, static contact and moving contact can't separate, thereby avoid the production of short circuit in-process electric arc, and then effectively solve the damage of electric.

It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that after reading the present specification, the technical personnel can still modify or equivalently replace the specific embodiments of the present invention, but these modifications or changes do not depart from the scope of the claims of the present application.

Claims (5)

1. The contact mechanism of the circuit breaker is characterized by comprising a moving contact, a fixed contact and a contact transmission part, wherein a clamping groove is formed in one side of the fixed contact, the lower portion of the moving contact is located in the clamping groove of the fixed contact, and the upper end of the moving contact is connected with the contact transmission part.

2. The contact mechanism as claimed in claim 1, wherein said stationary contact is a U-shaped clamp plate and said movable contact is a single copper plate.

3. A circuit breaker using the contact mechanism of any one of claims 1-2, wherein the circuit breaker includes a housing, a wire inlet terminal, a contact mechanism, a wire outlet terminal, and a shunt trip coil, the wire inlet terminal, the contact mechanism, the wire outlet terminal, and the shunt trip coil are installed in the housing, the wire inlet terminal is connected to the stationary contact of the contact mechanism, the wire outlet terminal is connected to the movable contact, and in a closed state, the lower portion of the movable contact is inserted into the clamping groove of the stationary contact.

4. The circuit breaker of claim 3, further comprising a PCB circuit board mounted within the housing, the PCB circuit board being in series with the movable contact.

5. The circuit breaker of claim 4, wherein the PCB circuit board is a leakage protection circuit board.

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