CN210778329U

CN210778329U - Asynchronous arc absorption switching device

Info

Publication number: CN210778329U
Application number: CN201920484006.9U
Authority: CN
Inventors: 王珊珊
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2020-06-16
Anticipated expiration: 2029-04-11

Abstract

The utility model discloses an asynchronous electric arc absorption switching device, it is including a set of contact and at least a set of arc extinguishing contact, be connected with between arc extinguishing contact and the contact and absorb electric arc mechanism, when switching device was closed, the arc extinguishing contact was closed before the contact, during switching device disconnection, the contact was disconnected before the arc extinguishing contact. The switching device realizes asynchronous arc absorption through the combination of the arc extinguishing contact and the control of the on/off sequence of the arc extinguishing contact and the contact, thereby extinguishing the arc, avoiding the loss of the arc to the contact and improving the reliability of the power switch.

Description

Asynchronous arc absorption switching device

Technical Field

The utility model relates to a power switching device especially relates to an asynchronous arc absorption switching device.

Background

The power switch is a generic name of an electrical device for cutting off/on a load circuit and cutting off a fault circuit in a power transmission and distribution system, and is classified by voltage class, and the power switch may be classified into a low voltage switch, a high voltage switch, an ultra high voltage switch, and the like.

In the power switch, in order to avoid the loss of the arc to the contacts, the conventional power switch mostly adopts a special arc initiator to draw the arc, as shown in fig. 8, the arc initiator includes two oppositely arranged brackets 20, two contacts 200 are located between the two brackets 20, a plurality of metal sheets 201 are arranged in the brackets 20, the arcs generated by the two contacts 200 can be led into the ground or other arc absorbing mechanisms through the metal sheets 201 during the closing or opening process, although the arc initiator can draw the arc, the arc still exists, so the arc initiator still has the disadvantages of damaging the contacts and poor reliability, meanwhile, the manufacturing cost of the arc initiator is high, the product cost of the power switch is increased, and particularly, the cost burden of enterprises is greatly increased during the production process.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing an asynchronous arc absorption switching device, this switching device passes through the combination of arc extinguishing contact and contact to and the control of arc extinguishing contact and contact on/off order, realize asynchronous formula arc absorption, thereby extinguish electric arc, and avoided electric arc to the loss of contact, improved power switch's reliability.

In order to solve the technical problem, the utility model adopts the following technical scheme.

The utility model provides an asynchronous electric arc absorption switching device, its includes a set of contact and at least a set of arc extinguishing contact, be connected with between arc extinguishing contact and the contact and absorb electric arc mechanism, when switching device closed, arc extinguishing contact closed before the contact, when switching device breaks off, the contact breaks off before the arc extinguishing contact.

Preferably, the number of the arc extinguishing contacts is two or more groups, when the switch device is closed, the two or more groups of arc extinguishing contacts are sequentially closed, and when the switch device is opened, the two or more groups of arc extinguishing contacts are sequentially opened.

Preferably, the contact head includes a first contact point and a second contact point which are oppositely arranged, the arcing contact head includes an arcing contact point and an elastic contact point which are oppositely arranged, the switching device includes a contact support frame made of conductive material, the first contact point and the arcing contact point are both arranged on the contact support frame, and the distance between the arcing contact point and the elastic contact point is smaller than the distance between the first contact point and the second contact point.

Preferably, the contact support frame is provided with a rotating shaft, and the contact support frame can rotate around the rotating shaft within a preset angle.

Preferably, a push rod is fixed on the contact support frame and used for driving the contact support frame to move in a reciprocating manner, so that the contact support frame drives the first contact point and the arc extinguishing contact point to be respectively closed with the second contact point and the elastic contact point.

Preferably, the arc extinguishing device further comprises an insulating ejector rod, the contact head and the arc extinguishing contact head are both button switches, when the insulating ejector rod moves forwards, the arc extinguishing contact head and the contact head are sequentially closed, and when the insulating ejector rod moves backwards, the contact head and the arc extinguishing contact head are sequentially disconnected.

Preferably, the arc absorbing mechanism is a resistor, a capacitor, or a combination of both.

Preferably, the absorbing arc mechanism is a surge absorber.

Preferably, the arc absorbing mechanism comprises a control circuit, a resistor R1 and a bidirectional thyristor D1, the resistor R1 and the bidirectional thyristor D1 are connected in series and then connected between the arc extinguishing contact and the contact, and a control signal output end of the control circuit is connected with a control end of the bidirectional thyristor D1.

In the asynchronous arc absorption switch device disclosed by the utility model, the arc extinguishing contact is closed before the contact, so that the arc generated by the arc extinguishing contact is transmitted to the arc absorption mechanism and absorbed by the arc absorption mechanism, thereby avoiding the generation of arc when the contact is closed; in the switching device, in the disconnection process, the contact is disconnected before the arc extinguishing contact, so that the electric arc generated by the contact is transmitted to the electric arc absorbing mechanism and absorbed by the electric arc absorbing mechanism, and the electric arc is prevented from being generated when the contact is disconnected. The switching device realizes asynchronous arc absorption through the combination of the arc extinguishing contact head and the control of the on/off sequence of the arc extinguishing contact head and the contact head, thereby extinguishing the arc, avoiding the loss of the arc to the contact and improving the reliability of the power switch.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of another state of the first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 4 is a schematic structural diagram of another state of the second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 6 is a schematic structural diagram of another state of the third embodiment of the present invention.

Fig. 7 is a circuit configuration diagram of an arc absorbing mechanism according to a third embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an arc initiator in the prior art.

Detailed Description

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Example 1:

referring to fig. 1 and 2, the switching device includes a set of contacts and at least one set of arcing contacts, an arc absorbing mechanism 305 is connected between the arcing contacts and the contacts, the arcing contacts are closed before the contacts when the switching device is closed, and the contacts are opened before the arcing contacts when the switching device is opened. During the closing process of the switchgear, since the arcing contact is closed before the contact, the arc generated by the arcing contact is transmitted to the arc absorbing mechanism 305 and absorbed by the arc absorbing mechanism 305, so as to avoid the generation of arc when the contact is closed; in the switching device, since the contact is opened before the arcing contact, the arc generated by the contact is transmitted to the arc absorbing mechanism 305 and absorbed by the arc absorbing mechanism 305, thereby avoiding the generation of arc when the contact is opened. In order to more effectively improve the arc extinguishing ability, the quantity of arc extinguishing contact is two sets or multiunit, when switching device closed, two sets or multiunit arc extinguishing contact closed in proper order, when switching device disconnection, two sets or multiunit arc extinguishing contact break off in proper order. Through the process, the contact assembly realizes on/off control of the contact and absorption of electric arcs in an asynchronous mode, and has the advantages of good arc extinguishing performance, simple structure and low cost.

In practical application, the switching device comprises a first contact point 301 and a second contact point 302 which are oppositely arranged, the arcing contact head comprises an arcing contact point 303 and an elastic contact point 304 which are oppositely arranged, the switching device comprises a contact support frame 300 made of conductive materials, the first contact point 301 and the arcing contact point 303 are both arranged on the contact support frame 300, and the distance between the arcing contact point 303 and the elastic contact point 304 is smaller than the distance between the first contact point 301 and the second contact point 302. The contact carrier 300 is provided with a rotation shaft 307, and the contact carrier 300 can rotate around the rotation shaft 307 within a preset angle. The power switch can be turned on or off by driving the contact supporting frame 300 to rotate within a predetermined angle, so that the arcing contact and the contact can be closed or opened.

The absorbing arc mechanism 305 is connected in series between the second contact 302 and the resilient contact 304;

in this embodiment, the elastic contact 304 is disposed on an elastic sheet 306, and may also be disposed on other types of elastic members such as springs.

Example 2:

as an alternative to embodiment 1, as shown in fig. 3 and 4, this embodiment is different from embodiment 1 in that a push rod 308 is fixed on the contact support frame 300, and the push rod 308 is used to drive the contact support frame 300 to reciprocate, so that the contact support frame 300 drives the first contact point 301 and the arcing contact point 303 to close with the second contact point 302 and the elastic contact point 304, respectively.

Example 3:

as an alternative to embodiment 1, referring to fig. 5 and 6, this embodiment is different from embodiment 1 in that an insulating ejector 311 is further included, the contact and the arcing contact are both button switches, when the insulating ejector 311 moves forward, the arcing contact and the contact are sequentially closed, and when the insulating ejector 311 moves backward, the contact and the arcing contact are sequentially opened.

It should be noted that the arc absorbing mechanism 305 in the above embodiments may be a resistor, a capacitor, or a combination of the two, or may be a surge absorber in practical applications. In addition, as shown in fig. 7, the arc absorbing mechanism 305 may further include a control circuit 309, a resistor R1 and a triac D1, the resistor R1 and the triac D1 are connected in series and then connected between the arcing contact and the contact, and a control signal output terminal of the control circuit 309 is connected to a control terminal of the triac D1. The control circuit 309 is configured to output a control command to drive the triac D1 to be turned on or off, thereby controlling the on state of the resistor R1.

The utility model discloses an asynchronous arc absorption switching device through the combination of arc extinguishing contact and contact to and the control of arc extinguishing contact and contact on/off order, realized asynchronous formula arc absorption, thereby extinguish electric arc, avoided electric arc to the loss of contact, improved power switch's reliability. Compared with the prior art, the utility model, need not the starting structure of a plurality of sheetmetals for the product structure is simpler, has lower product cost moreover.

The above is only the embodiment of the utility model discloses the preferred, is not used for the restriction the utility model discloses, the all is in the utility model discloses a modification, equivalence replacement etc. that do in the technical scope all should contain the utility model discloses the within range that protects.

Claims

1. An asynchronous arc absorption switching device is characterized in that the switching device comprises a group of contact heads and at least one group of arc extinguishing contact heads, an arc absorption mechanism is connected between the arc extinguishing contact heads, when the switching device is closed, the arc extinguishing contact heads are closed before the contact heads, and when the switching device is disconnected, the contact heads are disconnected before the arc extinguishing contact heads;

the contact head comprises a first contact point and a second contact point which are oppositely arranged, the arc extinguishing contact head comprises an arc extinguishing contact point and an elastic contact point which are oppositely arranged, the switch device comprises a contact support frame made of conductive materials, the first contact point and the arc extinguishing contact point are both arranged on the contact support frame, and the distance between the arc extinguishing contact point and the elastic contact point is smaller than the distance between the first contact point and the second contact point;

the electric arc absorbing mechanism is connected between the second contact point and the elastic contact point in series;

the arc absorption mechanism comprises a control circuit, a resistor R1 and a bidirectional thyristor D1, the resistor R1 and the bidirectional thyristor D1 are connected in series and then connected between an arc extinguishing contact and a contact, and a control signal output end of the control circuit is connected with a control end of the bidirectional thyristor D1.