CN218160243U - Contact system and circuit breaker - Google Patents

Abstract

The utility model relates to the field of low-voltage electrical appliances, in particular to a contact system, wherein a moving contact of the contact system comprises a moving conductive plate and a moving contact, a static contact structure comprises a static contact which is rotationally arranged, the static contact comprises a static conductive plate and a static contact, and the static contact and the moving contact can rotate towards two opposite directions; the static contact structure also comprises an arc striking structure, the arc striking structure comprises an arc striking part communicated with the static contact, and the static contact drives the arc striking part to be far away from the moving contact when rotating towards the direction far away from the moving contact; in the process of closing the moving contact and the static contact, the moving conductive plate is firstly contacted and conducted with the arc striking piece, and then the moving contact is contacted and conducted with the static contact; in the breaking process of the moving contact and the static contact, the moving contact is separated from the static contact firstly, and then the moving conductive plate is separated from the arc striking piece; the utility model discloses still relate to a breaker including the contact system; the contact system and the circuit breaker avoid or obviously reduce burning loss of electric arcs to the movable/static contacts, and increase the opening distance when the movable/static contacts are mutually repelled.

Description

Contact system and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to contact system and one kind include contact system's circuit breaker.

Background

The circuit breaker is one of important electrical components in the field of low-voltage electrical appliances, is used for connecting and disconnecting current, automatically cuts off the circuit when overcurrent or short-circuit current occurs in the circuit, and protects a power line, electrical appliances in the circuit and the like.

The circuit breaker generally comprises a contact system, an arc extinguishing system, an operating mechanism, a tripping structure, a shell and the like, wherein the contact system comprises a moving contact and a fixed contact, the operating mechanism drives the moving contact to swing, and the moving contact/the fixed contact is contacted or separated to connect or disconnect a circuit. In the existing circuit breaker, electric arcs can appear between moving/static contacts when the moving/static contacts are separated and contacted, the electric arcs delay the disconnection time of the switch, reduce the disconnection performance of the switch, ablate the moving/static contacts (the moving/static contacts are high in price and difficult to replace), and even cause serious burning loss of loads and circuit breaker components in a circuit. Therefore, the circuit breaker is provided with the arc striking structure, so that the electric arc generated when the movable contact and the fixed contact are separated is quickly and smoothly led into the arc extinguishing system to be extinguished.

The existing arc striking structure is generally realized by setting a fixed arc angle: when the moving contact and the static contact are separated, the moving contact and the static contact are separated finally, electric arcs can be generated between the moving silver point and the static silver point and then are led into an arc extinguishing system by a fixed arc angle to be extinguished, and therefore the moving contact and the static contact can be seriously ablated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a contact system and circuit breaker, it avoids or is showing the burnout that has reduced electric arc to moving/static contact, has increased the opening distance when moving/static contact is repulsive each other moreover.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a contact system comprises a static contact structure and a movable contact arranged in a rotating mode, wherein the movable contact comprises a movable conductive plate and a movable contact arranged on the movable conductive plate; the static contact structure also comprises an arc striking structure, the arc striking structure comprises an arc striking element which is communicated with the static contact, and the static contact drives the arc striking element to be far away from the movable contact when rotating towards the direction far away from the movable contact; in the process of closing the moving contact and the static contact, the moving conductive plate is firstly contacted and conducted with the arc striking piece, and then the moving contact is contacted and conducted with the static contact; in the breaking process of the moving contact and the static contact, the moving contact is separated from the static contact firstly, and then the moving conductive plate is separated from the arc striking piece.

Preferably, the arc striking piece is rotatably arranged relative to the fixed contact; the arc striking structure further comprises an arc striking part resetting piece, and the arc striking part resetting piece applies resetting force to the arc striking part to enable the arc striking part to have a tendency of rotating towards the static contact.

Preferably, after the moving contact is separated from the arc striking piece, the arc striking piece resetting piece drives the arc striking piece to abut against the fixed contact.

Preferably, the arc striking piece is conducted with the fixed contact through the arc striking piece resetting piece; or the arc striking piece, the arc striking piece resetting piece and the static contact are all conducted.

Preferably, the arc striking part resetting piece is an arc striking part torsion spring, one end of the arc striking part torsion spring is matched with the arc striking part, and the other end of the arc striking part torsion spring is limited.

Preferably, the static conductive plate comprises a static conductive plate groove, the spiral part of the torsion spring of the arc striking piece is positioned in the static conductive plate groove, one end of the torsion spring is matched with the side wall of the static conductive plate groove, and the other end of the torsion spring of the arc striking piece is matched with the arc striking piece.

Preferably, the static contact structure further comprises a static contact cover and an arc striking piece torsion spring shaft, the static contact cover is fixedly matched with the static conductive plate and synchronously rotates, the static contact cover comprises a pair of static contact cover side walls which are respectively located on two sides of the static conductive plate, the arc striking piece torsion spring shaft is located in a groove of the static conductive plate, two ends of the arc striking piece torsion spring shaft are respectively matched with the side walls of the static contact cover, and a spiral part of the arc striking piece torsion spring is movably sleeved on the arc striking piece torsion spring shaft.

Preferably, the arc striking piece is rotatably arranged on the static conductive plate.

Preferably, the arc striking piece is rotatably arranged on the static conductive plate and comprises an arc striking piece arc striking plate and an arc striking piece mounting arm, and the arc striking piece arc striking plate is positioned on one side of the static contact and is rotatably arranged on the static conductive plate through the arc striking piece mounting arm; when the moving contact and the static contact are closed, the arc striking plate of the arc striking piece is abutted against the moving conductive plate.

Preferably, the arc striking piece arc striking plate comprises a first arc striking piece arc striking plate section and a second arc striking piece arc striking plate section which are connected in a bending mode, the second arc striking piece arc striking plate section is further connected with the arc striking piece mounting arm, the first arc striking piece arc striking plate section is bent towards one side far away from the fixed contact relative to the second arc striking piece arc striking plate section, and after the moving contact is separated from the arc striking piece, the second arc striking piece arc striking plate section is abutted to the static conductive plate.

Preferably, the fixed contact structure further includes a fixed contact support and a fixed contact driving member, the fixed contact is rotatably disposed on the fixed contact support through a fixed contact shaft, and the fixed contact driving member applies an acting force to the fixed contact to enable the fixed contact to have a tendency of rotating towards the movable contact.

Preferably, the static contact driving part is a static contact torsional spring, a spiral part of the static contact torsional spring is rotatably arranged on the static contact bracket through a static contact torsional spring shaft, one end of the static contact torsional spring is matched with the static contact bracket, and the other end of the static contact torsional spring is matched with the static contact.

Preferably, the static contact structure further includes a static contact stressed shaft disposed on the static conductive rod, and the static contact stressed shaft is matched with one end of a static contact torsion spring.

Preferably, the static contact further comprises a static contact limiting portion, and after the moving contact is disconnected from the static contact, the static contact driving member drives the static contact limiting portion to rotate so as to enable the static contact limiting portion to be in limiting fit with the static contact support.

Preferably, the static contact support comprises support side walls and a support base plate, the two support side walls are arranged at intervals relatively and are respectively connected with the support base plate in a bending manner, the static contact is rotatably arranged between the two support side walls, and two ends of a static contact shaft are respectively arranged on the two support side walls; the support bottom plate is provided with a support limiting part, and the support limiting part protrudes towards the static contact and is in limiting fit with the static contact limiting part.

A circuit breaker comprising said contact system.

In the breaking process of the moving contact and the static contact of the contact system, as the moving contact is firstly separated from the static contact and then the moving conductive plate is separated from the arc striking piece, the electric arc is generated between the moving conductive plate and the arc striking piece, the burning loss of the electric arc to the moving contact and the static contact is avoided or remarkably reduced, and the service life of the contact system can be remarkably prolonged; the moving contact and the static contact can rotate in two opposite directions, the arc striking piece and the static contact synchronously rotate, and when short-circuit current flows through the contact system to repel the moving contact and the static contact from each other, the static contact carries the arc striking piece to synchronously rotate to enable the arc striking piece to be far away from the moving contact, so that the maximum repulsion distance between the arc striking piece and the moving contact is increased, and the arc extinguishing effect is enhanced.

The utility model discloses circuit breaker, it includes contact system, its long service life and arc extinguishing performance are good.

Drawings

Fig. 1 is a schematic view of an assembly structure of an arc extinguishing system and a contact system of the present invention;

fig. 2 is a schematic view of the disassembled structure of the arc extinguishing system, the moving contact and the static contact structure of the present invention;

FIG. 3 is a schematic diagram of an explosion structure of the static contact structure of the present invention;

fig. 4 is an explosion structure diagram of the arc extinguishing system of the present invention;

FIG. 5 is a schematic structural view of the arc striking grid of the present invention;

fig. 6 is a schematic sectional view of the arc extinguishing system and the contact system in an assembled state, wherein the moving contact and the static contact are in a closed state;

fig. 7 is a schematic sectional view of the arc extinguishing system and the contact system of the present invention in an assembled state, in which the movable contact is separated from the stationary contact and is in contact with the arc striking member;

fig. 8 is a schematic sectional view of the arc extinguishing system and the contact system of the present invention in an assembled state, in which the moving contact is separated from the static contact and the arc striking member, the moving contact and the static contact are mutually repelled and the moving contact and the static contact rotate in opposite directions respectively;

fig. 9 is a schematic sectional structure view of the arc extinguishing system and the contact system in an assembled state of the present invention, showing the opening distance between the striking angle of the moving contact and the striking member and the opening distance between the moving contact and the stationary contact when the moving contact is repelled, assuming that the stationary contact cannot rotate.

Detailed Description

The following description will further describe embodiments of the contact system and the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 9. The contact system and the circuit breaker of the present invention are not limited to the description of the following embodiments.

The utility model discloses a contact system, it includes static contact structure and moving contact 3 that the rotation set up, moving contact 3 includes moving current conducting plate 3-0 and sets up moving contact 3-2 on moving current conducting plate 3-0, the static contact structure includes cooperating with moving contact 3 and the static contact 13 that the rotation set up, static contact 13 includes static current conducting plate and the static contact 13-1 that sets up on static current conducting plate, static contact 13 and moving contact 3 can rotate to two opposite directions; the static contact structure also comprises an arc striking structure, the arc striking structure comprises an arc striking part 14 communicated with the static contact 13, and the static contact 13 drives the arc striking part 14 to be driven to be far away from the movable contact 3 when rotating towards the direction far away from the movable contact 3; in the process of closing the moving contact 3 and the static contact 13, the moving conductive plate 3-0 is firstly contacted and conducted with the arc striking piece 14, and then the moving contact 3-2 is contacted and conducted with the static contact 13-1; in the breaking process of the moving contact 3 and the static contact 13, the moving contact 3-2 is separated from the static contact 13-1, and then the moving conductive plate 3-0 is separated from the arc striking piece 14.

In the breaking process of the moving contact 3 and the static contact 13 of the contact system, as the moving contact 3-2 is firstly separated from the static contact 13-1 and then the moving conductive plate 3-0 is separated from the arc striking piece 14, the electric arc is generated between the moving conductive plate 3-0 and the arc striking piece 14, the burning loss of the electric arc to the moving contact 3-2 and the static contact 13-1 is avoided or obviously reduced, and the service life of the contact system can be obviously prolonged; the moving contact 3 and the static contact 13 can rotate in two opposite directions, the arc striking part and the static contact 13 synchronously rotate, when short-circuit current flows through the contact system to enable the moving contact 3 and the static contact 13 to repel away from each other, the static contact 13 carries the arc striking part 14 to rotate to enable the arc striking part 14 to be far away from the moving contact 3, and therefore the maximum repulsion distance between the arc striking part 14 and the moving contact 3 is increased, and the arc extinguishing effect is enhanced.

As shown in fig. 1-4 and 6-9, it is an embodiment of the circuit breaker of the present invention.

The circuit breaker comprises a contact system and an arc extinguishing system which are matched with each other, wherein the contact system comprises a moving contact 3 and a static contact structure, the static contact structure comprises a static contact 13 matched with the static contact 3, and an electric arc generated when the moving contact 3 and the static contact 13 are disconnected enters the arc extinguishing system to be extinguished. Further, the moving contact 3 and the static contact 13 can rotate in two opposite directions, and particularly when a short-circuit current flows through the contact system, the moving contact 3 and the static contact 13 repel each other and rotate in two opposite directions respectively.

As shown in fig. 2 and 6-9, the movable contact 3 comprises a movable conductive plate 3-0 and a movable contact 3-2 arranged on the movable conductive plate 3-0; the static contact structure also comprises an arc striking structure, the arc striking structure comprises an arc striking part 14 electrically connected with the static contact 13, and the static contact 13 drives the arc striking part 14 to be far away from the moving contact 3 when rotating towards the direction far away from the moving contact 3; as shown in fig. 6, in the process of closing the moving contact 3 and the static contact 13, the moving conductive plate 3-0 contacts and conducts with the arc striking element 14 first, then the moving contact 3-2 contacts and conducts with the static contact 13-1, and in the state that the moving contact 3-2 and the static contact 13-1 are closed, the moving conductive plate 3-0 keeps contacting and conducting with the arc striking element 14, that is, there are the following stages: the movable conductive plate 3-0 is contacted and conducted with the arc striking part 14, the movable contact 3-2 is not contacted with the static contact 13-1, and then the movable contact 3-2 is contacted with the static contact 13-1 to realize the closing of the circuit breaker; as shown in fig. 7, in the process of breaking the moving contact 3 and the fixed contact 13, the moving contact 3-2 is separated from the fixed contact 13-1, and then the moving conductive plate 3-0 is separated from the arc striking member 14, so as to realize the opening of the circuit breaker, that is, there are the following stages: the movable contact 3-2 and the fixed contact 13-1 are separated, and the movable conductive plate 3-0 and the arc striking piece 14 are kept in contact, and no arc is generated at this stage.

As shown in fig. 2-3 and 6-9, the moving contact 3 further includes a moving contact arc-striking angle 3-1 disposed at one end of the moving conductive rod 3-0, where the moving contact 3-2 is disposed, and the moving contact arc-striking angle 3-1 protrudes toward the direction of the fixed contact 13; one end of the arc striking piece 14 protrudes towards the moving contact 3 relative to the static contact 13, the arc striking angle 3-1 of the moving contact is matched with the arc striking piece 14, and in the closing process of the moving contact 3 and the static contact 13, the arc striking angle 3-1 of the moving contact is firstly contacted with the arc striking piece 14, and then the moving contact 3-2 is contacted and conducted with the static contact 13-1; in the breaking process of the moving contact 3 and the static contact 13, the moving contact 3-2 is separated from the static contact 13-1 firstly, and then the arc striking angle 3-1 of the moving contact is separated from the arc striking piece 14.

As shown in fig. 9, when the moving contact 3 is repelled to the breaking position, assuming that the static contact 13 cannot rotate, a distance between an arc striking angle 3-1 of the moving contact 3 and the arc striking element 14 is D2, a distance between the moving contact 3-2 and the static contact 13-1 is D3, and D2 is less than D3; as shown in fig. 8, since the static contact 13 can rotate in a direction away from the movable contact 3, when the movable contact 3 and the static contact 13 are repelled from each other, a distance between an arc striking angle 3-1 of the movable contact 3 and the arc striking member 14 can reach D1, where D1 is greater than D3, thereby lengthening an arc and enhancing an arc extinguishing effect; therefore, the contact system of the utility model reduces the burning loss of the fixed contact 13-1 and the movable contact 3-2 while ensuring the arc extinguishing performance.

Preferably, the arc ignition member 14 is rotatably arranged with respect to the stationary contact 13, in other words: the arc ignition member 14 is rotatably arranged and can rotate relative to the stationary contact 13. Further, the arc striking structure further comprises an arc striking part resetting part 15, and the arc striking part resetting part 15 applies resetting force to the arc striking part 14 to enable the arc striking part 14 to have a tendency of rotating towards the static contact 13; in the process of closing the moving contact 3 and the static contact 13, the moving conductive plate 3-0 presses the arc striking piece 14 to make the arc striking piece swing towards the direction far away from the static contact 13; in the process of breaking the moving contact 3 and the static contact 13, the moving contact 3 avoids the arc striking piece 14, and the arc striking piece resetting piece 15 drives the arc striking piece 14 to rotate towards the static contact 13. Further, after the movable contact 3 is separated from the arc striking member 14, the arc striking member resetting member 15 drives the arc striking member 14 to abut against the fixed contact 13, the arc striking member resetting member 15 preferably abuts against a static conductive plate of the fixed contact 13, and the arc striking member 14 is prevented from further rotating towards the fixed contact 13 through limit matching of the arc striking member resetting member 15 and the static conductive plate.

Specifically, as shown in fig. 6, when the moving contact 3 and the fixed contact 13 are closed, the moving contact 3 presses the arc striking member 14 to rotate counterclockwise until the moving contact 3-2 is in contact with and conducted with the fixed contact 13-1; referring to fig. 6-7, when the moving contact 3 and the static contact 13 are disconnected, the moving contact 3 avoids the arc striking member 14, and the arc striking member 14 rotates clockwise under the action of the arc striking member resetting member 15 until the arc striking member 14 abuts against the static conductive plate of the static contact 13, and the two are in limit fit.

As shown in fig. 3, 6-9, the arc striking component 14 is rotatably disposed on the static conductive plate of the static contact 13, and when the static contact 13 rotates, the arc striking component 14 is driven to integrally move to be away from the movable contact 3. Further, the arc striking piece 14 comprises an arc striking piece arc striking plate 14-0 and an arc striking piece mounting arm 14-1, and the arc striking piece arc striking plate 14-0 is located on one side of the static contact 13 and is rotatably arranged on the static conductive plate through the arc striking piece mounting arm 14-1; when the moving contact 3 and the static contact 4 are closed, the arc striking plate 14-0 of the arc striking part is abutted against the moving conductive plate 3-0. Further, the arc striking plate 14-0 of the arc striking member is located between the static conductive plate and the arc extinguishing system 2, and one end of the arc striking plate 14-0 extends to an inlet of the arc extinguishing system 2 and protrudes toward the movable contact 3 relative to the static contact 13.

As another embodiment, the arc striking component 14 may also be rotatably disposed on the stationary contact cover 12 of the stationary contact structure, and the stationary contact 13 drives the arc striking component 14 to integrally move when rotating, so as to be away from the movable contact 3.

As another embodiment, the arc striking piece 14 and the fixed contact 13 rotate independently, and the arc striking piece 14 rotates in a direction away from the movable contact 3 under the driving of the fixed contact 13, rather than moving integrally with the fixed contact 13; when the moving contact 3 and the static contact 13 are repelled from each other, the static contact 13 drives the arc striking member 14 to rotate in a direction away from the moving contact 3 to increase an opening distance between the arc striking member 14 and the moving contact 13, after the static contact 13 rotates to a position farthest from the moving contact 3, the static contact 13 starts to rotate towards the moving contact 3, the static contact 13 avoids the arc striking member 14 at the moment, and the arc striking member 14 automatically (for example, the arc striking member 14 is driven by a reset structure such as a spring or a leaf spring) rotates towards the moving contact 3. Further, when the fixed contact 13 is repelled, the arc striking element 14 is not driven away from the movable contact 3 until the fixed contact 13 rotates by a predetermined angle (the predetermined angle is smaller than the maximum rotation angle of the fixed contact 13).

As shown in fig. 6 to 9, the arc striking member 14 is electrically connected to the fixed contact 13 through the arc striking member resetting member 15.

As shown in fig. 3 and 6-9, the arc striking member resetting member 15 is an arc striking member torsion spring, one end of which is engaged with the arc striking member 14, and the other end of which is limited. Further, one end of the arc striking piece torsion spring is matched with the arc striking piece 14, and the other end of the arc striking piece torsion spring is matched with the static conductive plate (as another embodiment, the end of the arc striking piece torsion spring is matched with the static contact cover 12 or the static contact bracket 112), and the arc striking piece 14 is simultaneously conducted with the static contact 13 through the arc striking piece torsion spring. Furthermore, the static conductive plate is provided with static conductive plate grooves 13-15, the spiral part of the torsion spring of the arc striking piece is positioned in the static conductive plate grooves 13-15, one end of the torsion spring is matched with the side walls of the static conductive plate grooves 13-15, and the other end of the torsion spring of the arc striking piece is matched with the arc striking piece 14.

As other embodiments, the arc striking piece 14, the arc striking piece resetting piece 15 and the fixed contact 13 are all connected, which is beneficial to reducing the resistance between the arc striking piece 14 and the fixed contact 13. For example, the arc striking part 14 is in contact with the fixed contact 13 through a soft conductor or through direct contact, and the arc striking part 15 is in contact with the arc striking part 14 and the fixed contact 13 respectively. When the arc striking piece 14 is in direct contact conduction with the fixed contact 13, a conductive paste can be coated on the contact position of the arc striking piece and the fixed contact 13, or the arc striking piece 14 and the fixed contact 13 are electrically connected through a flexible conductor, so that the resistance is reduced.

As other embodiments, the striking member returning element 15 may also be a tension spring, a pressure spring, a spring leaf, or the like, so as to apply a force to the striking member 14 to rotate it toward the fixed contact 13.

As shown in fig. 3, 6-9, the static contact structure further comprises a static contact cover 12 and an arc striking element torsion spring shaft 16; the static contact cover 12 is fixedly matched with and synchronously rotates with a static conductive plate of a static contact 13, namely the static contact cover 12 and the static conductive plate keep relatively static, the static contact cover 12 comprises a pair of static contact cover side walls 12-0 which are respectively positioned at two sides of the static conductive plate, an arc striking piece torsion spring shaft 16 is positioned in a static conductive plate groove 13-15, two ends of the arc striking piece torsion spring shaft are respectively connected with the static contact cover side walls 12-0, the arc striking piece torsion spring shaft 16 is positioned in the static conductive plate groove 13-15, two ends of the arc striking piece torsion spring shaft are respectively matched with the static contact cover side walls 12-0, and a spiral part of an arc striking piece torsion spring is movably sleeved on the arc striking piece torsion spring shaft 16. Further, the static contact cover 12 further comprises a static contact cover top plate 12-4, the static contact cover top plate 12-4 is respectively connected with the side walls 12-0 of the two static contact covers, and the static contact cover top plate 12-4 is provided with an avoiding opening 12-40 to avoid a static contact 13-1 of the static contact 13; and the side wall 12-0 of the static contact cover is provided with an arc striking piece torsion spring shaft hole 12-16 matched with an arc striking piece torsion spring shaft 16.

As shown in fig. 3, 6-9, the arc runner mounting arm 14-1 is rotatably mounted on the static conductive plate via an arc runner shaft 110. Specifically, as shown in fig. 3, the arc striking member 14 includes two arc striking member mounting arms 14-1, which are respectively connected to the arc striking plate 14-0 of the arc striking member and respectively located at two sides of the static conductive plate, and the two arc striking member mounting arms 14-1 are respectively connected to the arc striking member shaft 110. Further, as shown in fig. 3, the side wall 12-0 of the fixed contact housing 12 is provided with an arc striking piece shaft hole 12-110 matching with the arc striking piece shaft 110, and two ends of the arc striking piece shaft 110 are respectively inserted into the two arc striking piece shaft holes 12-110.

As shown in fig. 3 and 6-9, the arc striking plate 14-0 of the arc striking part comprises a first arc striking plate section 14-0-0 and a second arc striking plate section 14-0-1 of the arc striking part, which are connected in a bending manner, the second arc striking plate section 14-0-1 of the arc striking part is further connected with an arc striking part mounting arm 14-1, the first arc striking plate section 14-0-0 of the arc striking part is bent towards one end far away from the fixed contact 13 relative to the second arc striking plate section 14-0-1 of the arc striking part, namely towards the inlet of the arc extinguishing system 2, and after the movable contact 3 is separated from the arc striking part 14, the second arc striking plate section 14-0-1 of the arc striking part is abutted against the static conductive plate.

As shown in fig. 6-7, the first segment 14-0-0 of the striking plate of the striking member is in contact with and conducted with the striking angle 3-1 of the movable contact 3, that is: in the process of closing the moving contact 3 and the static contact 13, an arc striking angle 3-1 of the moving contact is firstly contacted and conducted with a first section 14-0-0 of an arc striking plate of an arc striking part, and then a moving contact 3-2 and a static contact 13-1 are closed; when the moving contact 3 is disconnected with the static contact 13, the moving contact 3-2 is separated from the static contact 14-1, and then the moving contact arc striking angle 3-1 is separated from the first section 14-0-0 of the arc striking plate of the arc striking piece.

As shown in fig. 6-9, the second segment 14-0-1 of the arc ignition plate 14-0 of the arc ignition member is engaged with one end of the arc ignition member torsion spring (i.e., the arc ignition member driving member 15).

As other embodiments, the arc striking element 14 may also be an elastic element fixedly disposed on the static conductive plate of the static contact 13, and a free end of the elastic element is engaged with the movable contact 3; in the process of closing the moving contact 3 and the static contact 13, the moving conductive plate 3-0 of the moving contact 3 presses the arc striking piece 14, so that the arc striking piece 14 is elastically deformed to be far away from the static contact 13; in the process of breaking the moving contact 3 and the static contact 13, the moving conductive plate 3-0 of the moving contact 3 avoids the arc striking piece 14, and the arc striking piece 14 resets.

As shown in fig. 3, 6-9, the static contact structure further includes a static contact support 112 and a static contact driving member 17, the static contact 13 is rotatably disposed on the static contact support 112 through a static contact shaft 19, and the static contact driving member 17 applies an acting force to the static contact 13, so that the static contact 13 tends to rotate towards the moving contact 3; when the moving contact 3 and the static contact 13 are in a closed state, short-circuit current flows through the contact system to repel the two, the two rotate in two opposite directions respectively, the two move away from each other and enable the static contact driving part 17 to store energy; when the static contact 13 moves to a predetermined position (for example, a maximum rotation angle position), the static contact driving member 17 releases energy to drive the static contact 13 to rotate towards the movable contact 3, and returns to the initial position.

As shown in fig. 3, 6-9, the static contact driving member 17 is a static contact torsion spring, a spiral portion of the static contact torsion spring is rotatably disposed on the static contact bracket 112 through a static contact torsion spring shaft 18, one end of the static contact torsion spring is matched with the static contact bracket 112, and the other end is matched with the static contact 13. Furthermore, the static contact torsion spring is a double torsion spring.

As another embodiment, the static contact driving element 17 may also be a tension spring, a compression spring, a spring leaf, or the like, and can provide a restoring force for the static contact 13, so that the static contact rotates to the initial position toward the movable contact 3.

As shown in fig. 3 and 6-9, the static contact structure further includes a static contact stressed shaft 111 disposed on the static conductive rod, the static contact stressed shaft 111 is engaged with one end of a static contact torsion spring, and the other end of the static contact torsion spring is engaged with a static contact bracket 112. Further, the bracket side wall of the static contact bracket 112 is provided with bracket static contact torsion spring shaft holes 112-18 matched with the static contact torsion spring shaft 18, and two ends of the static contact torsion spring shaft 18 are respectively arranged in the bracket static contact torsion spring shaft holes 112-18 of the two bracket side walls.

Specifically, as shown in fig. 3 and 6-9, two ends of the static contact stress shaft 111 respectively protrude from two sides of the static conductive plate of the static contact 13, the static contact torsion spring is a double torsion spring, two ends of the static contact torsion spring are respectively matched with two ends of the static contact stress shaft 111, and one end of the middle part of the static contact torsion spring is matched with the static contact bracket 112.

As shown in fig. 6-9, the fixed contact force-bearing shaft 111, the fixed contact torsion spring shaft 18 and the fixed contact shaft 19 are arranged in parallel and at an interval, and the fixed contact shaft 19 is located at one side of a central connection line of the fixed contact force-bearing shaft 111 and the fixed contact torsion spring shaft 18; the distance between the static contact stressed shaft 111 and the static contact torsion spring shaft 18 is greater than the distance between the static contact shaft 19 and the static contact torsion spring shaft 18. Specifically, as shown in fig. 6 to 9, when the moving contact 3 and the static contact 13 repel each other, the static contact 13 rotates counterclockwise, and the torsion spring of the static contact applies an acting force to the force-bearing shaft 111 of the static contact, so that the static contact 13 rotates clockwise.

In other embodiments, the distance between the fixed contact stressed shaft 111 and the fixed contact torsion spring shaft 18 is smaller than the distance between the fixed contact shaft 19 and the fixed contact torsion spring shaft 18.

As shown in fig. 3, the static contact support 112 includes a support sidewall and a support bottom plate, the two support sidewalls are disposed at an interval and are respectively connected to the support bottom plate in a bending manner, the static contact 13 is rotatably disposed between the two support sidewalls, and two ends of the static contact shaft 19 are respectively disposed on the two support sidewalls. Further, the side wall of the bracket is provided with bracket static contact shaft holes 112-19 matched with the static contact shaft 19; and a static contact cover side wall 12-0 of the static contact cover 12 is provided with a static contact cover static contact shaft hole 12-19 matched with the static contact shaft 19, and the static contact cover side wall 12-0 is positioned between the static contact 13 and the bracket side wall.

Preferably, as shown in fig. 3 and 6-9, the bracket bottom plate is provided with a bracket limiting portion 112-0, and the bracket limiting portion 112-0 protrudes toward the static contact 13 and is in limiting fit with the static contact limiting portion 13-0; after the moving contact 3 and the static contact 13 are disconnected, the static contact driving part 17 (i.e. the static contact torsion spring) applies an acting force to the static contact 13, so that the acting force is in limit fit with the static contact limiting part 13-0 to prevent the static contact 13 from continuously rotating towards the moving contact 3.

As other embodiments, the static contact structure may also be provided with a separate structure, instead of the bracket limiting portion 112-0, to limit and cooperate with the static contact 13.

As shown in fig. 1-3 and 6-9, the fixed contact structure further includes a partition structure 11, the partition structure 11 includes an outer cover 11-0 and a partition 11-1 connected to each other, the outer cover 11-0 is used for accommodating the fixed contact 13, the fixed contact cover 12 and the fixed contact bracket 112, the outer cover 11-0 is provided with an outer cover opening for avoiding the fixed contact 13-1 of the fixed contact 13, the partition 11-1 is provided with a partition opening 11-1-0 for avoiding the movable contact 3, the partition 11-1 is opposite to the inlet of the arc extinguishing system 2, and the movable contact 3 passes through the partition opening 11-1-0 and swings in the partition opening 11-1-0 to be closed or disconnected with the fixed contact 13.

As shown in fig. 3, the stationary contact holder 112 is preferably a metal holder of an integrated structure.

As shown in fig. 2, 4-9, the arc extinguishing system 2 includes an arc extinguishing plate 21, an arc extinguishing grid group 20 and an arc striking grid 23; the two arc-extinguishing plates 21 are oppositely arranged at intervals; the arc extinguishing grid group 20 comprises a plurality of arc extinguishing grid pieces arranged side by side at intervals, and each arc extinguishing grid piece is fixedly connected with two arc extinguishing plates 21 respectively; the arc striking grid sheet 23 is arranged at one end of the arc extinguishing grid sheet group 20 and is opposite to the static contact 13, the arc striking grid sheet 23 is fixedly connected with the two arc extinguishing plates 21 respectively, the arc striking grid sheet 23 comprises a grid sheet arc striking plate 23-0, and the free end of the grid sheet arc striking plate 23-0 is bent towards the arc striking piece 14. Further, as shown in fig. 6 to 9, the free end of the grid ignition plate 23-0 is opposed to the free end of the arc ignition member ignition plate 14-0 of the arc ignition member 14. The arc striking grid pieces 23 further promote the electric arc to enter the arc extinguishing system 2, and arc extinguishing efficiency is improved.

As shown in fig. 4-5, the arc striking grid 23 further comprises two arc striking grid mounting arms 23-1, and the two arc striking grid mounting arms 23-1 are connected to the grid arc striking plates 23-0 and are respectively fixedly connected to the two arc extinguishing plates 21. Further, the arc striking grid 23 is integrally in a chevron structure, the grid arc striking plate 23-0 comprises a grid arc striking plate connecting portion, a first grid arc striking plate section 23-0-0 and a second grid arc striking plate section 23-0-1, one end of the first grid arc striking plate section 23-0-0 is bent and connected with one end of the second grid arc striking plate section 23-0-1, the other end of the first grid arc striking plate section is connected with the middle of the grid arc striking plate connecting portion, the other end of the second grid arc striking plate section 23-0-1 inclines towards the arc striking piece 14 and extends towards the inlet of the arc extinguishing grid set 20, two ends of the grid arc striking plate connecting portion are respectively connected with the two arc striking grid mounting arms 23-1, the grid arc striking plate connecting portion is coplanar with the first grid arc striking plate section 23-0-0, the second grid arc striking plate section 23-0-1 and the arc striking grid mounting wall 23-1 are bent towards the same side of the grid arc striking plate connecting portion and are positioned between the first grid arc striking plate section 23-0-0 and the arc striking piece 14. Furthermore, the extending direction of the first section 23-0-0 of the grid plate arc striking plate and the arc striking grid plate mounting arm 23-1 intersects with the extending direction of each arc extinguishing grid plate (namely, from one end of each arc extinguishing grid plate, which is positioned at the inlet of the arc extinguishing system, to one end of each arc extinguishing grid plate, which is positioned at the outlet of the arc extinguishing system).

As shown in fig. 6 to 9, one end of each arc chute plate of the arc chute plate group 20 at the inlet of the arc extinguishing system is inclined toward the direction of the stationary contact 13. Furthermore, each arc extinguishing grid piece is arranged in parallel with the first section 14-0-0 of the arc striking plate of the arc striking piece 14.

As shown in fig. 1-2, 4, and 6-9, the arc extinguishing system 2 further includes an arc extinguishing cap 22, the arc extinguishing cap 22 and the arc striking grid 23 are opposite and respectively located at outer sides of two ends of the arc extinguishing grid set 20, and the arc extinguishing cap 22 is matched with the two arc extinguishing plates 21.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (16)

1. A contact system comprises a static contact structure and a movable contact (3) which is rotatably arranged, wherein the movable contact (3) comprises a movable conductive plate (3-0) and a movable contact (3-2) which is arranged on the movable conductive plate (3-0), the static contact structure comprises a static contact (13) which is matched with the movable contact (3) and is rotatably arranged, the static contact (13) comprises a static conductive plate and a static contact (13-1) which is arranged on the static conductive plate, and the static contact (13) and the movable contact (3) can rotate towards two opposite directions; the method is characterized in that: the static contact structure also comprises an arc striking structure, the arc striking structure comprises an arc striking piece (14) communicated with the static contact (13), and the static contact (13) drives the arc striking piece (14) to be far away from the movable contact (3) when rotating towards the direction far away from the movable contact (3); in the closing process of the moving contact (3) and the static contact (13), the moving conductive plate (3-0) is firstly contacted and conducted with the arc striking piece (14), and then the moving contact (3-2) is contacted and conducted with the static contact (13-1); in the breaking process of the moving contact (3) and the static contact (13), the moving contact (3-2) is separated from the static contact (13-1) firstly, and then the moving conductive plate (3-0) is separated from the arc striking piece (14).

2. The contact system of claim 1, wherein: the arc striking piece (14) is rotationally arranged relative to the static contact (13); the arc striking structure further comprises an arc striking part resetting piece (15), and the arc striking part resetting piece (15) applies resetting force to the arc striking part (14) to enable the arc striking part (14) to have a tendency of rotating towards the fixed contact (13).

3. The contact system of claim 2, wherein: after the moving contact (3) is separated from the arc striking piece (14), the arc striking piece resetting piece (15) drives the arc striking piece (14) to be abutted against the fixed contact (13).

4. The contact system of claim 2, wherein: the arc striking piece (14) is communicated with the static contact (13) through an arc striking piece resetting piece (15); or the arc striking piece (14), the arc striking piece resetting piece (15) and the static contact (13) are all conducted.

5. The contact system of claim 2, wherein: the arc striking part resetting piece (15) is an arc striking part torsion spring, one end of the arc striking part torsion spring is matched with the arc striking part (14), and the other end of the arc striking part torsion spring is limited.

6. The contact system of claim 5, wherein: the static conductive plate comprises static conductive plate grooves (13-15), the spiral part of the torsion spring of the arc striking piece is positioned in the static conductive plate grooves (13-15), one end of the torsion spring is matched with the side walls of the static conductive plate grooves (13-15), and the other end of the torsion spring of the arc striking piece is matched with the arc striking piece (14).

7. The contact system of claim 6, wherein: the static contact structure further comprises a static contact cover (12) and an arc striking piece torsion spring shaft (16), the static contact cover (12) is fixedly matched with the static conductive plate and synchronously rotates, the static contact cover (12) comprises a pair of static contact cover side walls (12-0) which are respectively located on two sides of the static conductive plate, the arc striking piece torsion spring shaft (16) is located in a static conductive plate groove (13-15), two ends of the arc striking piece torsion spring shaft are respectively matched with the static contact cover side walls (12-0), and a spiral part of an arc striking piece torsion spring is movably sleeved on the arc striking piece torsion spring shaft (16).

8. The contact system of claim 2, wherein: the arc striking piece (14) is rotatably arranged on the static conductive plate.

9. The contact system of claim 8, wherein: the arc striking piece (14) is rotatably arranged on the static conductive plate, the arc striking piece (14) comprises an arc striking piece arc striking plate (14-0) and an arc striking piece mounting arm (14-1), and the arc striking piece arc striking plate (14-0) is positioned on one side of the static contact (13) and is rotatably arranged on the static conductive plate through the arc striking piece mounting arm (14-1); when the moving contact (3) and the static contact (13) are closed, the arc striking plate (14-0) of the arc striking piece is abutted against the moving conductive plate (3-0).

10. The contact system of claim 9, wherein: the arc striking piece arc striking plate (14-0) comprises an arc striking piece arc striking plate first section (14-0-0) and an arc striking piece arc striking plate second section (14-0-1) which are connected in a bending mode, the arc striking piece arc striking plate second section (14-0-1) is further connected with an arc striking piece mounting arm (14-1), the arc striking piece arc striking plate first section (14-0-0) is bent towards one side far away from the static contact (13) relative to the arc striking piece arc striking plate second section (14-0-1), and after the movable contact (3) is separated from the arc striking piece (14), the arc striking piece arc striking plate second section (14-0-1) is abutted to the static conductive plate.

11. The contact system of claim 1, wherein: the static contact structure further comprises a static contact support (112) and a static contact driving part (17), the static contact (13) is rotatably arranged on the static contact support (112) through a static contact shaft (19), and the static contact driving part (17) applies acting force to the static contact (13) to enable the static contact (13) to have a trend of rotating towards the dynamic contact (3).

12. The contact system of claim 11, wherein: the static contact driving part (17) is a static contact torsional spring, a spiral part of the static contact torsional spring is rotatably arranged on the static contact bracket (112) through a static contact torsional spring shaft (18), one end of the static contact torsional spring is matched with the static contact bracket (112), and the other end of the static contact torsional spring is matched with the static contact (13).

13. The contact system of claim 12, wherein: the static contact structure further comprises a static contact stress shaft (111) arranged on the static conductive rod, and the static contact stress shaft (111) is matched with one end of a static contact torsion spring.

14. The contact system of claim 11, wherein: the static contact (13) further comprises a static contact limiting part (13-0), and after the movable contact (3) and the static contact (13) are disconnected, the static contact driving part (17) drives the static contact limiting part (13-0) to rotate so as to enable the static contact limiting part to be in limiting fit with the static contact support (112).

15. The contact system of claim 14, wherein: the static contact support (112) comprises support side walls and a support bottom plate, the two support side walls are arranged at intervals relatively and are respectively connected with the support bottom plate in a bending mode, a static contact (13) is rotatably arranged between the two support side walls, and two ends of a static contact shaft (19) are respectively arranged on the two support side walls; the support bottom plate is provided with a support limiting part (112-0), and the support limiting part (112-0) protrudes towards the static contact (13) and is in limiting fit with the static contact limiting part (13-0).

16. A circuit breaker, characterized by: the circuit breaker comprising a contact system according to any of claims 1-15.

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