CN216487935U

CN216487935U - Moving contact of circuit breaker

Info

Publication number: CN216487935U
Application number: CN202123387279.8U
Authority: CN
Inventors: 周敏琛; 马雄杰; 王晖
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-05-10
Anticipated expiration: 2031-12-30

Abstract

A moving contact of a circuit breaker belongs to the technical field of low-voltage electrical appliances. The movable contact spring is characterized in that: the moving contact also comprises a protective support, the contact spring penetrates through the protective support, the protective support comprises a partition part and a top cover part, the partition part is positioned between the adjacent moving contacts, and the top cover part is positioned above the contact spring. The advantages are that: the protection support can prevent the moving contact from laterally deviating, improves the stability of the moving contact, and simultaneously plays a role in protecting the contact spring from being corroded by charged particles.

Description

Moving contact of circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to moving contact of circuit breaker.

Background

The low-voltage frame circuit breaker is a component of low-voltage electrical equipment with large capacity, is mainly used in an industrial power system, can ensure the connection and disconnection of a circuit under rated load, can automatically disconnect the circuit in abnormal states of the circuit (such as overload, short circuit, undervoltage and the like), and can completely isolate the load from a power supply by separating a moving contact and a static contact.

The contact system (including moving contacts and stationary contacts) is an important component of a circuit breaker for switching on and off current. When fault current occurs in the circuit, the intelligent controller detects the fault current and sends an action signal to the operating mechanism, and the operating mechanism drives the moving contact to swing so as to rapidly disconnect the moving contact and the fixed contact, thereby breaking the current. In the process, an electric arc can be generated between the movable contact and the fixed contact, and the electric arc is extinguished after entering the arc extinguishing chamber. The electric arc can form high temperature, high pressure in the sealed region near the moving contact, quiet contact to the arc root can be in contact surface short time stop, thereby lead to contact, contact plate and near plastic parts's the surperficial some material can liquefy rapidly, solidify into the tiny particle and splash afterwards, if these tiny particles get into the contact spring by accident, can cause the contact pressure inaccurate, can make the contact spring card dead in the serious time, thereby lead to the short endurance of circuit breaker to reduce or the switch-on failure.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the structure of the movable contact of the existing circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a moving contact of circuit breaker, it has add a protective cradle, and this protective cradle can prevent the moving contact lateral deviation, improves the stability of moving contact, plays the effect that protection contact spring avoids electrified particle erosion simultaneously.

The utility model discloses a task is accomplished like this, a moving contact of circuit breaker, including the contact support, rotate the movable contact spring that sets up in the contact support, be located contact spring between movable contact spring and the contact support, the moving contact still include a protection support, the contact spring pass protection support, this protection support includes wall portion and top cap portion, wall portion be located between the adjacent movable contact spring, top cap portion be located contact spring's top.

In a specific embodiment of the present invention, a baffle portion is further provided between the partition portions, and the baffle portion prevents charged particles on the front side of the moving contact from eroding the contact spring.

In another specific embodiment of the present invention, the baffle portion is provided with a through hole for contacting the head of the contact spring with the movable contact.

In another specific embodiment of the present invention, the contact support includes side plate portions located at both sides, a spring receiving hole is provided at a top of the chamber for receiving the chamber between the side plate portions, a fitting groove portion is provided above the spring receiving hole for receiving the movable contact piece, the spring receiving hole is used for receiving the contact spring, and the fitting groove portion is used for fitting with the top cover portion of the protection bracket, so as to shield the contact spring from above.

The utility model discloses a still another concrete embodiment, the moving contact still include stabilizing support, stabilizing support includes crossbeam portion and stake section, install on the contact supports at the both ends of crossbeam portion, the inserting groove has been seted up to the part towards the moving contact piece that holds the chamber, the one end of stake section is inserted the inserting groove in, the other end is inserted crossbeam portion on.

In another specific embodiment of the present invention, the portion of the partition of the protection bracket corresponding to the stabilizing bracket has only the upper structure left after the lower structure is cut off.

In yet another specific embodiment of the present invention, the partition has a shape corresponding to the movable contact piece, and a rotation hole for passing a rotation shaft of the movable contact is formed in the partition, and cavities are formed in both sides of the partition.

In a more specific embodiment of the present invention, the movable contact is provided with a main contact and an arc contact located above the main contact, and the upper edge of the cavity is higher than the arc contact and the lower edge of the cavity is lower than the main contact.

In yet another specific embodiment of the present invention, the movable contact is provided with a notch on the same side as the main contact and below the main contact, and the movable contact is provided with a pressing recess on one side close to the contact spring.

In a still more specific embodiment of the present invention, the partition portion, the top cover portion and the baffle portion are integrally formed.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: the protection support comprises a spacing part and a top cover part, wherein the spacing part is positioned between the movable contact pieces, the top cover part is positioned above a contact spring, the spacing part prevents the movable contact from laterally deviating, the stability of the movable contact is improved, and the top cover part protects the contact spring from being corroded by charged particles; second, since the above two effects are combined, the number of parts is reduced without reducing the functions, and the structure is simplified.

Drawings

Fig. 1 is a schematic view of the moving contact of the present invention.

Fig. 2 is an explosion diagram of the moving contact of the present invention.

Fig. 3 is a schematic view of the uncompressed state of the contact spring of the moving contact according to the present invention.

Fig. 4 is a schematic diagram of a state of the moving contact when the contact spring of the moving contact is compressed.

Fig. 5 is a schematic view of the contact support of the moving contact according to the present invention.

Fig. 6 is a schematic view of a protection bracket of the moving contact of the present invention.

Fig. 7 is a schematic diagram of the moving contact piece of the moving contact of the present invention.

In the figure: 1. the contact comprises a contact support, 11 parts of side plates, 12 parts of accommodating cavities, 13 parts of accommodating cavities, 14 parts of matching groove parts, 15 parts of rotating shaft holes, 16 parts of inserting grooves, 17 parts of cover mounting holes, 18 parts of swing rod matching holes and 19 parts of support matching protrusions; 2. the movable contact spring, 21, the pressing pit, 22, the notch, 23, the arc contact, 24, the main contact, 25, the swinging hole and 26, the fixed pit; 3. the protection device comprises a protection bracket, a protection bracket 31, a partition part, a protection head part 300, a rotation hole 311, a cavity 312, a top cover part 32, a baffle part 33, a baffle part 331, a through hole and a movable contact bus 4; 5. cover, 51, blocking part; 6. a stabilizing support 61, a beam part 62 and a support part; 7. a side plate; 8. a rotating shaft; 9. a contact spring; 100. a mounting plate; 200. and (7) mounting the plate.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 and 2, the moving contact of the circuit breaker of the present invention includes a contact support 1 and a moving contact piece 2 rotatably disposed on the contact support 1. Specifically, the movable contact piece 2 is rotatably arranged on the contact support 1 through a rotating shaft 8. A contact spring 9 is arranged between the movable contact piece 2 and the contact support 1 and is used for providing contact pressure for the movable contact piece 2. The moving contact also comprises a protective support 3, and the protective support 3 is also rotatably arranged on the contact support 1 through a rotating shaft 8. That is, the protective bracket 3 and the movable contact piece 2 rotate around the same rotation center. The contact spring 9 passes through the protection bracket 3.

As shown in fig. 2 and 6, the protection bracket 3 is made of an insulating material, typically rubber or the like. The protective bracket 3 includes a partition portion 31 and a top cover portion 32. The partition part 31 is positioned between the adjacent moving contacts 2, so that the adjacent moving contacts 2 are prevented from generating lateral deviation, and the stability of the moving contacts is improved. The cap portion 32 is located above the contact spring 9 for protecting the contact spring 9 from the charged particles.

Further referring to fig. 6, the shape of the partition portion 31 corresponds to the shape of the movable contact piece 2, a rotation hole 311 for the rotation shaft 8 to pass through is formed in the partition portion, concave cavities 312 are further formed in the left side and the right side of the partition portion 31, and the concave cavities 312 can greatly reduce the contact area between the partition portion 31 and the movable contact piece 2, reduce the friction force between the partition portion 31 and the movable contact piece 2, and further improve the flexibility of the movable contact piece 2 in movement. The partition parts 31 are arranged at intervals in a plurality of pieces. Meanwhile, as shown in fig. 7, since the movable contact 2 is welded with the main contact 24 and the arc contact 23, the width of the main contact 24 and the arc contact 23 is generally larger than the thickness of the movable contact 2, the cavity 312 can make the main contact 24 and the arc contact 23 clear, so that the upper edge of the cavity 312 is higher than the arc contact 23, and the lower edge of the cavity 312 is lower than the main contact 24.

In order to further protect the contact spring 9, a baffle portion 33 is further provided between the partition portions 31. The shutter portion 33 prevents the charged particles on the front side of the movable contact 2 from eroding the contact spring 9. In order to facilitate the contact of the contact spring 9 to the movable contact piece 2, a through hole 331 for the head of the contact spring 9 to contact the movable contact piece 2 is further provided in the shutter portion 33. The passing hole 331 also serves a certain limit when the contact spring 9 abuts on one end of the movable contact piece 2.

With reference to fig. 6, the top cover portion 32 is a plate and is located above the contact spring 9, and the top cover portion 32 is connected to the partition portion 31 and the baffle portion 33. Preferably, the blocking portion 31, the top cover portion 32 and the baffle portion 33 are integrally formed to manufacture the protection bracket 3. The protective bracket 3 can fully protect the contact spring 9 and prevent charged particles from corroding the contact spring 9.

With continued reference to fig. 1 and fig. 2, the movable contact further includes a movable contact bus 4, a cover 5, a stabilizing bracket 6, a side plate 7, a support plate 100 and a mounting plate 200. The moving contact bus 4 is usually a copper bus, one end of which is electrically connected with the moving contact 2, and the other end is electrically connected with the outlet row of the circuit breaker. The moving contact bus 4 is electrically connected with the moving contact piece 2 by adopting flexible connection, so that the mobility of the moving contact piece 2 is ensured. The cover 5 is mounted on the contact support 1 and is located on the front side of the moving contact 2, i.e. on the side of the moving contact 2 facing away from the contact support 1. The cover 5 is provided with a blocking part 51 extending towards the static contact, and the blocking part 51 can block the gas from flowing downwards and help the electric arc to rapidly enter an arc extinguishing chamber above the static contact and the moving contact.

As shown in fig. 1 and 2, the stabilizing bracket 6 includes a beam portion 61 and a bracket portion 62, one end of the bracket portion 62 is inserted into the contact support 1, and the other end is inserted into the beam portion 61. The beam portion 61 is also mounted at both ends on the contact support 1 by means of a pivot 8. The bracket part 62 is also provided with a passing hole for passing the rotating shaft 8. The stabilizing support 6 can stabilize the moving contact piece 2, prevent the moving contact piece 2 from generating lateral deviation or shaking when being electrified, and is beneficial to improving the performance of the moving contact.

In order to make the space for the stable support 6 to move, the part of the partition part 31 of the protection support 3 corresponding to the support part 62 of the stable support 6 only has an upper structure, that is, the partition part 31 is composed of a head 300, the head 300 is not a complete partition part 31, but is an upper structure left after the lower structure of the partition part 31 is cut off, and the space left after the lower part is cut off is the occupied space of the stable support 6.

As shown in fig. 1 to 4, the pair of side plates 7 is provided, and the pair of side plates 7 is mounted on both sides of the contact support 1 to improve the strength of the holder contact support 1. The lower edge of the contact support 1 protrudes below the side plate 7.

As shown in fig. 2 to 4, the pair of supports 100 is provided, the pair of supports 100 are respectively rotatably provided at lower portions of the pair of side plates 7, and the supports 100 are inserted into a base of the circuit breaker, so that the movable contact is rotatably provided on the base. The moving contact bus 4 and the pair of brackets 100 are fixedly arranged, and specifically, the pair of brackets 100 are clamped into two sides of the moving contact bus 4.

As shown in fig. 2 to 4, the mounting plate 200 is mounted below the movable contact busbar 4, and the mounting plate 200 and the movable contact busbar 4 are fixed by screws.

As shown in fig. 5, the contact holder 1 is an integrally formed plastic part. Typically made of a thermoplastic material. The contact support 1 comprises side plate parts 11 positioned at two sides, an accommodating cavity 12 is arranged between the two side plate parts 11, a spring accommodating hole 13 is arranged at the top of the accommodating cavity 12, a matching groove part 14 is arranged above the spring accommodating hole 13, and a part of the accommodating cavity 12 facing to the movable contact piece 2 is also provided with a plug-in connection groove 16. The accommodating cavity 12 is used for accommodating the movable contact piece 2, the spring accommodating hole 13 is used for accommodating the contact spring 9, the matching groove part 14 is used for matching with the top cover part 32 of the protection bracket 3 so as to shield the contact spring 9 from the upper part, and the inserting groove 16 is used for inserting and matching with the bracket part 62 of the stabilizing bracket 6.

Still referring to fig. 5, the side plate 11 is further provided with a rotation shaft hole 15, a cover mounting hole 17, a swing lever fitting hole 18, and a bracket fitting projection 19. The rotating shaft hole 15 is used for the rotating shaft 8 to pass through. The cover mounting holes 17 are used for clamping mounting bosses at two ends of the cover 5. The swing rod matching hole 18 is used for installing a swing rod connected with the operating mechanism on the contact support 1. The bracket mating protrusion 19 is used for positioning and mounting with the side plate 7.

As shown in fig. 7, the moving contact piece 2 is generally made of copper, and the arc contact 23 on the moving contact piece 2 is located above the main contact 24. The main contact 24 and the arcing contact 23 are both located on a side of the moving contact 2 close to the stationary contact, i.e. on a side facing away from the contact support 1. The movable contact piece 2 is arranged on the same side surface with the main contact 24 and is provided with a notch 22 below the main contact 24, and the notch can reduce the stress applied to the joint between the upper main contact 24 and the movable contact piece 2 and improve the strength of the joint of the main contact 24. A fixed pit 26 for fixedly connecting with the flexible connection is arranged below the movable contact piece 2. Specifically, the fixed recess 26 is formed on one side surface in the thickness direction of the movable contact piece 2. A swing hole 25 is formed in the movable contact 2 between the main contact 24 and the fixed recess 26 in the height direction, and the swing hole 25 is used for the rotation shaft 8 to pass through. One side of the movable contact piece 2 close to the contact spring 9 is provided with a pressing pit 21, and the pressing pit 21 is used for pressing and positioning one end of the contact spring 9 close to the movable contact piece 2.

As shown in fig. 3, when the movable contact is in the separated state, the contact spring 9 is in the extended state, the movable contact 2 swings in a direction away from the contact holder 1, the protection holder 3 swings along with the movable contact 2 in a direction away from the contact holder 1, the top cover portion 32 thereon moves along with the protection holder 3, but the top cover portion 32 is not separated from the fitting groove portion 14, and the top cover portion 32 still seals the upper side of the contact spring 9 at this time, so that the contact spring 9 can be protected from erosion of charged particles. The moving contact piece 2 always closes the contact spring 9 during the entire oscillation.

As shown in fig. 4, when the movable contact is in the closed position. At this time, the contact spring 9 is in a compressed state, the movable contact piece 2 swings towards the direction approaching the contact support 1, the protection support 3 swings towards the direction approaching the contact support 1 along with the movable contact piece 2, the top cover part 32 on the protection support moves along with the protection support 3, the top cover part 32 is inserted into the matching groove part 14, at this time, the top cover part 32 seals the upper part of the contact spring 9, and the contact spring 9 can be protected from erosion of charged particles.

Claims

1. The utility model provides a moving contact of circuit breaker, includes that the contact supports (1), rotates moving contact (2) of setting on contact support (1), is located contact spring (9) between moving contact (2) and contact support (1), its characterized in that: the moving contact also comprises a protective support (3), the contact spring (9) penetrates through the protective support (3), the protective support (3) comprises a partition part (31) and a top cover part (32), the partition part (31) is positioned between the adjacent moving contact pieces (2), and the top cover part (32) is positioned above the contact spring (9).

2. A movable contact for a circuit breaker as claimed in claim 1, wherein: and baffle parts (33) are also arranged between the partition parts (31), and the baffle parts (33) prevent the charged particles on the front side of the movable contact (2) from eroding the contact spring (9).

3. A movable contact for a circuit breaker as claimed in claim 2, wherein: the baffle part (33) is provided with a through hole (331) for the head part of the contact spring (9) to contact with the movable contact piece (2).

4. A movable contact for a circuit breaker as claimed in claim 1, wherein: the contact support (1) comprises side plate parts (11) positioned on two sides, a containing cavity (12) is arranged between the two side plate parts (11), a spring containing hole (13) is formed in the top of the containing cavity (12), a matching groove part (14) is arranged above the spring containing hole (13), the containing cavity (12) is used for containing the movable contact (2), the spring containing hole (13) is used for containing the contact spring (9), and the matching groove part (14) is used for being matched with a top cover part (32) of the protection support (3) so as to shield the contact spring (9) from the top.

5. A movable contact for a circuit breaker as claimed in claim 4, wherein: the moving contact still include stabilizing support (6), stabilizing support (6) include crossbeam portion (61) and leg portion (62), the both ends of crossbeam portion (61) are installed on contact support (1), inserting groove (16) have been seted up to the part towards moving contact piece (2) of holding chamber (12), the one end of leg portion (62) is inserted in inserting groove (16), the other end insert on crossbeam portion (61).

6. A movable contact for a circuit breaker as claimed in claim 5, wherein: the part of the partition part (31) of the protective bracket (3) corresponding to the stabilizing bracket (6) only has an upper structure left after cutting off the lower structure.

7. A movable contact for a circuit breaker as claimed in claim 1, wherein: the shape of the partition part (31) corresponds to that of the movable contact piece (2), a rotating hole (311) for a rotating shaft (8) of the movable contact to penetrate through is formed in the partition part, and concave cavities (312) are formed in two sides of the partition part (31).

8. A movable contact for a circuit breaker as claimed in claim 7, wherein: the movable contact piece (2) is provided with a main contact (24) and an arc contact (23) positioned above the main contact (24), the upper edge of the cavity (312) is higher than the arc contact (23) and the lower edge of the cavity (312) is lower than the main contact (24).

9. A movable contact for a circuit breaker as claimed in claim 8, wherein: the movable contact piece (2) is arranged on the same side face with the main contact (24) and is provided with a gap (22) below the main contact (24), and a pressing pit (21) is arranged on one side of the movable contact piece (2) close to the contact spring (9).

10. A movable contact for a circuit breaker as claimed in claim 2, wherein: the partition part (31), the top cover part (32) and the baffle part (33) are integrally manufactured.