CN220065602U

CN220065602U - Contact system of circuit breaker

Info

Publication number: CN220065602U
Application number: CN202321669189.4U
Authority: CN
Inventors: 王云峰; 林佳; 马雄杰
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-11-21
Anticipated expiration: 2033-06-28

Abstract

A contact system of a circuit breaker belongs to the technical field of low-voltage electrical appliances. The movable contact can act relative to the fixed contact, and the movable contact contacts or separates from the fixed contact after acting; the static contact include conducting block and striking piece, the striking piece install on the conducting block, characteristics are: the gas generating piece is arranged along the extending direction of the arc striking piece, protrudes out of the arc striking piece and divides the arc striking piece into at least two areas. The advantages are that: because the extension direction of the striking piece is provided with at least one gas generating part which is positioned above the fixed contact, when an electric arc is generated between the moving contact and the fixed contact, the electric arc burns the gas generating part, and the gas generating part can rapidly release gas, so that the gas yield of the whole contact arc extinguishing system is improved, the electric arc energy can be consumed more rapidly, the aim of rapidly extinguishing the electric arc is fulfilled, and the electric life of the circuit breaker is prolonged.

Description

Contact system of circuit breaker

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a contact system of a circuit breaker.

Background

The circuit breaker is an important electrical device, and can cut off the current carried by the circuit breaker, so as to realize the function of breaking a circuit. The circuit breaker generally comprises a contact system, wherein the contact system comprises a moving contact and a fixed contact, the moving contact is contacted with or separated from the fixed contact after acting, and then the switch is switched on or switched off. The circuit breaker further includes an arc extinguishing chamber for extinguishing an arc generated when the moving contact is separated from the fixed contact, and the circuit is opened only when the arc is extinguished. Therefore, the arc extinguishing chamber is undoubtedly an important component of the switch.

With the development of circuit breakers, such as direct current, occasions with high voltage are more and more, so that the current is less and less easy to extinguish. The existing circuit breaker is generally provided with a gas generating part on the periphery of an arc extinguishing chamber and a fixed contact, and the extinguishing of an electric arc is accelerated by the characteristic that the gas generating part releases insulating gas after being burnt by the electric arc, but with the increase of the electrical life requirement of the circuit breaker, the gas generating part is required to release more gas to adapt to the requirement.

In view of the above-mentioned prior art, it is necessary to reasonably improve the contact system structure of the existing circuit breaker to solve the problem that the amount of the released insulating gas is insufficient after the existing gas generating member is burned by the arc. To this end, the inventors have advantageously devised that the technical solutions described below are created in this context.

Disclosure of Invention

The utility model aims to provide a contact system of a circuit breaker, wherein a gas generating part is arranged above a fixed contact and corresponds to the position of an arc striking piece of the fixed contact, so that the gas generating part can quickly release insulating gas after an electric arc is generated, the gas yield of the whole contact arc extinguishing system is improved, and the electrical life of the circuit breaker is prolonged.

The utility model accomplishes the task by this, a contact system of the breaker, including stationary contact and moving contact, the said moving contact can move relative to stationary contact, the said moving contact contacts or separates with the said stationary contact after moving; the static contact comprises a conductive block and an arc striking sheet, wherein the arc striking sheet is arranged on the conductive block, and the static contact further comprises at least one gas generating piece arranged along the extending direction of the arc striking sheet, wherein the gas generating piece protrudes out of the arc striking sheet and divides the arc striking sheet into at least two areas.

In a specific embodiment of the present utility model, the number of the gas generating parts is two, and the arc striking plate is divided into three areas.

In another specific embodiment of the present utility model, the stationary contact further includes a stationary contact and an arc contact, and the gas generating member is located above the stationary contact and the arc contact.

In yet another specific embodiment of the present utility model, the stationary contact further includes an insulating pad, the insulating pad including a pad portion and a pair of extension legs, the pad portion being positioned between the striking plate and the conductive block when the insulating pad is installed, the extension legs being positioned on both sides of the striking plate.

In yet another embodiment of the present utility model, the pad portion is a cavity having a shape matching the shape of the striking plate.

In a further specific embodiment of the utility model, a closing groove is arranged on the striking plate along the extending direction of the striking plate, and the closing groove is positioned in the middle of the striking plate.

In a further specific embodiment of the utility model, the gas generating member is fixed to or integrally formed with the cushion portion, and the gas generating member passes through the closed groove.

In a further specific embodiment of the present utility model, the gas generating member is plate-shaped, and a mounting unfilled corner is further provided on the gas generating member, and the mounting unfilled corner can facilitate the gas generating member to pass through the closed groove.

In yet another specific embodiment of the present utility model, the circuit breaker further includes an arc extinguishing chamber, and the arc extinguishing chamber is located above the fixed contact and the moving contact.

In yet a further specific embodiment of the utility model, the arc contact is located above the stationary contact and the striking tab is located above the arc contact.

The technical scheme provided by the utility model has the technical effects that: because the extension direction of the striking piece is provided with at least one gas generating part which is positioned above the fixed contact, namely the gas generating part is positioned between the moving contact and the fixed contact, when an electric arc is generated between the moving contact and the fixed contact, the gas generating part is burnt by the electric arc, and the gas generating part can rapidly release gas, so that the gas yield of the whole contact arc extinguishing system is improved, the electric arc energy can be consumed more rapidly, the aim of rapidly extinguishing the electric arc is fulfilled, and the electric life of the circuit breaker is prolonged.

Drawings

Fig. 1 is a perspective exploded view of the contact quenching system of the present utility model;

FIG. 2 is an exploded view of the stationary contact of the present utility model;

FIG. 3 is a schematic view of an insulating housing according to the present utility model;

fig. 4 is a schematic view of the stationary contact and the striking plate according to the present utility model.

In the figure: 1. the contact system comprises a contact system, a fixed contact, a conductive block, a fixed contact, an arc contact, a fixed contact, an arc striking piece, a 1141, a closed groove, a 115, an insulating cushion block, a 1151, a gasket part, a 1152, an extension leg and a movable contact; 2. an arc extinguishing chamber; 100. the gas generating piece, 101, installation unfilled corners; 200. a relief hole; 300. screw holes.

Detailed Description

In order that the technical spirit and advantages of the present utility model may be more clearly understood, reference will now be made in detail to the following examples, which are not intended to limit the scope of the utility model, but rather are merely equivalent in form to the present utility model.

In the following description, any reference to the directional or azimuthal sense of up, down, left, right, front and rear is based on the positional state in the illustrated example, and therefore should not be construed as a limitation on the technical solution provided by the present utility model.

Referring to fig. 1, a contact system of a circuit breaker includes a contact system 1 and an arc extinguishing chamber 2, wherein the arc extinguishing chamber 2 is positioned at one side of an opening direction of the contact system 1, when an arc is generated on the contact system 1, the arc enters the arc extinguishing chamber 2, and extinguishes in the arc extinguishing chamber 2, and then the circuit breaker cuts off current.

The contact system 1 comprises a stationary contact 11 and a movable contact 12, said movable contact 12 being movable, typically rotatable, but not limited to rotatable, with respect to the stationary contact 11. The moving contact 12 contacts or separates from the fixed contact 12 after the action, so as to realize the opening or closing of the circuit breaker.

Referring to fig. 2, the stationary contact 11 includes a conductive block 111, a stationary contact 112, an arc contact 113, an arc striking plate 114, and an insulating pad 115. The conductive block 111 is typically made of copper material, which facilitates its conductive function.

The stationary contact 112 and the arc contact 113 are silver contacts, which are fixed on the conductive block 111, and usually, a welding mode is adopted. The fixed contact 112 is matched with the movable contact on the movable contact 12, when the circuit breaker is in normal current bearing working condition, the fixed contact 112 is matched with the movable contact in a contact way, and the arc contact 113 is positioned on one side of the fixed contact 112 close to the arc extinguishing chamber 2. That is, when the circuit breaker performs a breaking operation, the stationary contact 112 is separated from the movable contact, and the arc contact 113 is separated again, so that an arc is generated from the arc contact 113. Of course, the arc contact 113 is not required, and the above-described sequential separation feature is not realized.

The arc striking plate 114 is also mounted on the conductive block 111, the arc striking plate 114 extends toward the direction of the arc extinguishing chamber 2, and the arc striking plate 114 is used for guiding the arc into the arc extinguishing chamber 2, so that the arc can quickly enter the grid plate group in the arc extinguishing chamber 2.

The insulating pad 115 is made of an insulating material, covers the conductive block 111, and exposes the stationary contact 112, the arcing contact 113, and the striking plate 114.

Referring to fig. 3, the insulating spacer 115 includes a spacer portion 1151 and a pair of extending legs 1152, wherein the spacer portion 1151 is located below the striking plate 114 and the extending legs 1152 are located at two sides of the striking plate 114 when the insulating spacer 115 is installed. The pad 1151 is a concave cavity, and the pad 1151 is used to open the striking plate 114. The pad 1151 is also coupled to a pair of extension legs 1152. The shape of the pad 1151 matches the shape of the striking plate 114. The insulation pad 115 is provided with a relief hole 200, preferably, the relief hole 200 is a round hole, which is used for letting the screw open, so that the screw can be screwed by a screwdriver.

Referring to fig. 4, a stationary contact 112 is fixed below the conductive block 111, the arc contact 113 is located above the stationary contact 112, and the striking plate 114 is located above the arc contact 113. Specifically, a slot is formed in the conductive block 111, and one end of the striking plate 114 is inserted into the slot, while the other end extends toward the arc extinguishing chamber 2. Screw holes 300 are provided on the conductive block 111 and the striking plate 114, and the screw holes 300 are used for placing screws and fixing the conductive block 111 and the striking plate 114. Specifically, three screw holes 300 are provided, two are located on the conductive block 111, and the other is located on the striking plate 114.

The screw holes 300 are in one-to-one correspondence with the relief holes 200. That is to say, the number of the relief holes 200 is three, and the positions of the relief holes correspond to the screw holes 300.

A closed slot 1141 is provided on the striking plate 114 along the extending direction of the striking plate 114, and the closed slot 1141 is located in the middle of the striking plate 114.

With continued reference to fig. 2 and 3, at least one gas generating member 100 is further included in the extending direction of the arc striking plate 114, and the gas generating member 100 protrudes from the arc striking plate 114 and divides the arc striking plate 114 into at least two areas.

Of course, the number of the gas generating members 100 is related to the divided regions, for example, two gas generating members divide the striking plate into three regions.

In this embodiment, the gas generating member 100 is disposed on the insulating pad 115, and more preferably, the gas generating member 100 is disposed on the pad portion 1151, and the two members are fixed to each other or integrally formed.

Of course, the present utility model is characterized in that the position of the gas generating member 100 is also within the scope of the present utility model if the gas generating member 100 is not disposed on the insulating pad 115 but disposed elsewhere.

The gas generating member 100 is plate-shaped or sheet-shaped, and the gas generating member 100 is further provided with a mounting unfilled corner 101, and the mounting unfilled corner 101 can facilitate the gas generating member 100 to pass through the closed groove 1141. At this time, since the closed slot 1141 is located at the middle of the arc striking plate 114, the gas generating member 100 is also located at the middle of the arc striking plate 114.

Because the gas generating member 100 is disposed, and the gas generating member 100 is located at one side of the striking plate 114 and above the stationary contact, that is, the gas generating member 100 is located between the moving contact 12 and the stationary contact 11, when an arc is generated between the moving contact 12 and the stationary contact 11, the arc burns the gas generating member 100, and the gas generating member 100 releases gas, so that the arc energy can be consumed more quickly, and the arc can be extinguished more quickly.

In summary, the technical scheme provided by the utility model overcomes the defects in the prior art, successfully completes the task of the utility model, and faithfully honors the technical effects carried by the applicant in the technical effect column above.

Claims

1. The contact system of the circuit breaker comprises a fixed contact (11) and a movable contact (12), wherein the movable contact (12) can act relative to the fixed contact (11), and the movable contact (12) is contacted with or separated from the fixed contact (11) after acting; the static contact (11) comprises a conductive block (111) and an arc striking piece (114), wherein the arc striking piece (114) is arranged on the conductive block (111), and is characterized in that: the gas generating piece (100) is arranged along the extending direction of the arc striking piece (114), the gas generating piece (100) protrudes out of the arc striking piece (114), and the arc striking piece (114) is divided into at least two areas.

2. A contact system of a circuit breaker according to claim 1, characterized in that: the number of the gas generating parts (100) is two, and the arc striking sheet is divided into three areas.

3. A contact system of a circuit breaker according to claim 1, characterized in that: the static contact (11) further comprises a static contact (112) and an arc contact (113), and the gas generating piece (100) is positioned above the static contact (112) and the arc contact (113).

4. A contact system of a circuit breaker according to claim 1, characterized in that: the static contact (11) further comprises an insulating pad (115), the insulating pad (115) comprises a pad portion (1151) and a pair of extending legs (1152), when the insulating pad (115) is installed, the pad portion (1151) is located between the arc striking piece (114) and the conductive block (111), and the extending legs (1152) are located on two sides of the arc striking piece (114).

5. A contact system of a circuit breaker according to claim 4, characterized in that: the pad portion (1151) is a cavity having a shape matching the shape of the striking plate (114).

6. A contact system of a circuit breaker according to claim 4, characterized in that: the arc striking sheet (114) is provided with a closed groove (1141) along the extending direction of the arc striking sheet (114), and the closed groove (1141) is positioned in the middle of the arc striking sheet (114).

7. The contact system of a circuit breaker of claim 6, wherein: the gas generating member (100) is fixed on the pad part (1151) or integrally manufactured with the pad part (1151), and the gas generating member (100) passes through the closed groove (1141).

8. The contact system of a circuit breaker of claim 7, wherein: the gas generating part (100) is plate-shaped, a mounting unfilled corner (101) is further arranged on the gas generating part (100), and the mounting unfilled corner (101) can facilitate the gas generating part (100) to pass through the closed groove (1141).

9. A contact system of a circuit breaker according to claim 1, characterized in that: the circuit breaker also comprises an arc extinguishing chamber (2), wherein the arc extinguishing chamber (2) is positioned above the fixed contact (11) and the moving contact (12).

10. A contact system of a circuit breaker according to claim 3, characterized in that: the arc contact (113) is positioned above the fixed contact (112), and the striking plate (114) is positioned above the arc contact (113).