CN213936096U

CN213936096U - Circuit breaker

Info

Publication number: CN213936096U
Application number: CN202120283824.XU
Authority: CN
Inventors: 王铖; 马俊贤; 陶涛
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-08-10
Anticipated expiration: 2031-02-01

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. The circuit breaker comprises a shell and a contact system arranged in the shell, wherein the contact system comprises a static contact component and a moving contact component, the static contact component comprises a static contact, the moving contact component comprises a moving contact which is arranged in a rotating mode, a moving terminal which is fixedly arranged on the shell and a flexible connection, two ends of the flexible connection are respectively electrically connected with the moving contact and the moving terminal, the on-off of a circuit breaker circuit is realized through the contact and separation of the static contact and the moving contact, an acute angle is formed between the flexible connection and the moving contact when the moving contact is in an opening position, the circuit breaker further comprises a first limiting device arranged between the flexible connection and the moving contact, and the first limiting device is used for stopping the flexible connection and shifting to one side close to the moving contact. The advantages are that: the opening speed of the movable guide rod is increased, so that the breaking capacity of the circuit breaker is improved; the flexible connection and the operation mechanism are isolated, the operation mechanism cannot be interfered, and metal particles in the breaking process can be prevented from polluting the operation mechanism and causing the failure of combination and separation.

Description

Circuit breaker

Technical Field

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

Background

Circuit breakers are the most important power distribution equipment in low voltage power distribution systems. With the continuous improvement of the requirements of power supply and power transmission and distribution equipment in power engineering, the performance requirements of users on circuit protection switches are higher and higher, and miniaturization, high performance, modularization and high reliability are the main development directions of the molded case circuit breakers at the present stage. The contact arc extinguishing device is an important component of the molded case circuit breaker. The shape and size design of a contact in the contact system is very critical, and is directly related to the breaking capacity and the electric service life of the molded case circuit breaker. The circuit breaker can produce electric arc in the process of breaking current, and the function of the arc extinguishing chamber is to elongate, break and rapidly extinguish the electric arc. If the arc burns on the moving contact and the static contact for a long time and is not led into the arc extinguish chamber, the breaking current failure can be caused; even if electric arc can be introduced into the arc extinguish chamber, if can not leave the moving contact and the static contact at a fast speed, still can cause a large amount of burnings on the surface of the moving contact and the static contact, influence the whole electric life of the circuit breaker, and in addition, the conventional arc extinguish chamber is easy to generate electric breakdown when the electric arc is elongated, broken and extinguished under a high-voltage environment, finally, long-time arc burning is caused, and the breaking performance of the circuit breaker is reduced.

In order to realize high voltage and high breaking capacity of the low-voltage circuit breaker, methods of enlarging an arc extinguish chamber, lengthening the length of a contact to enlarge the opening distance of the contact, connecting a plurality of breakpoints in series and the like are generally adopted, although the methods can improve the breaking capacity of the molded case circuit breaker, the size of the molded case circuit breaker can be obviously increased, so that the market demand is reduced, the cost of the circuit breaker can be increased, and the market competitiveness is reduced.

In the prior art, the moving guide rod of the moving contact is opposite to the direction of current flowing in the flexible connection, and the direction of electric force applied to the moving guide rod by the flexible connection is opposite to the repulsion direction of the moving guide rod, so that the repulsion speed of the moving guide rod is reduced, even the moving guide rod cannot reach the position of the moving arc striking plate, the electric arc on the moving contact cannot jump to the moving arc striking plate to realize the quick transfer of the electric arc, and the breaking capacity of the circuit breaker is reduced, even the breaking fails.

In view of the above-mentioned prior art, the applicant has made active and advantageous designs, and the technical solutions to be described below have been made in this context.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circuit breaker can improve thereby the breaking capacity that opens speed improvement circuit breaker of moving the guide arm.

The utility model aims at reaching like this, a circuit breaker, including casing and the contact system of setting in the casing, contact system including static contact subassembly and moving contact subassembly, the static contact subassembly including the static contact, moving contact subassembly including the moving contact that rotates the setting, fixed moving terminal and the soft connection that both ends set up on the casing respectively with moving contact and moving terminal electricity are connected, the break-make that realizes the circuit breaker circuit through the contact and the separation of static contact and moving contact, wherein, form an acute angle between soft connection and the moving contact when the moving contact is in the open position, still including a first stop device of setting between soft connection and moving contact for backstop soft connection is to the skew of one side that is close to the moving contact.

In a specific embodiment of the present invention, the first position-limiting device is a magnetic component for magnetically shielding the flexible connection.

In another specific embodiment of the present invention, the first position-limiting device is a shaft-like structure, and at least one end of the first position-limiting device is fixedly disposed on the housing.

In another specific embodiment of the present invention, the first position-limiting device is a plate-shaped structure and is fixed on the housing by a clamping manner.

In another specific embodiment of the present invention, the flexible connector further comprises a second limiting device disposed on one side of the flexible connector opposite to the first limiting device for stopping the flexible connector from shifting to one side away from the movable contact.

In yet another specific embodiment of the present invention, the connection point of the flexible connection and the moving contact is located between the moving contact of the moving contact and the rotation center of the moving contact, so that the flexible connection provides a torque in the same direction as the repelling direction of the moving contact and the moving contact.

The utility model discloses a set up first stop device and second stop device respectively in the both sides of movable contact flexible coupling, compare with prior art, the beneficial effect who has is: the opening speed of the movable guide rod is increased, so that the breaking capacity of the circuit breaker is improved; the isolation between the flexible connection and the operating mechanism is realized, the interference on the movement of the operating mechanism is avoided, and the metal particles in the breaking process can be prevented from polluting the operating mechanism, so that the breaking and combining failure is caused.

Drawings

Fig. 1 is a schematic diagram of the circuit breaker in the open state.

Fig. 2 is a schematic diagram of the circuit breaker in a closing state.

Fig. 3 is a schematic position diagram of the moving contact, the operating mechanism, the release and the arc extinguishing system according to the present invention.

In the figure: 1. a housing; 2. the static contact assembly comprises a static contact assembly, 21 static contacts, 211 static contacts and 22 static terminals; 3. moving contact assembly, 31 moving contact, 311 moving contact, 32 flexible connection, 33 moving terminal; 4. a first limiting device; 5. a second limiting device; 6. an arc extinguishing system, 61, a static arc striking plate, 62, a movable arc striking plate and 63, an arc extinguishing chamber; 7. and (4) an arc.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

Referring to fig. 1 and 2, a circuit breaker includes a housing 1, and a contact system, an operating mechanism (not shown), a trip unit (not shown), and an arc extinguishing system 6 disposed in the housing 1. Specifically, the shell 1 is provided with an arc extinguishing system 6 at the bottom, and a contact system, an operating mechanism and a release are sequentially arranged above the shell 1 from left to right. The contact system is used for breaking and connecting line current; the operating mechanism is used for driving the contact system to act; the trip unit is used for monitoring the line current and acts to actuate the operating mechanism when the line current is abnormal. The contact system comprises at least one fixed contact part (such as a fixed contact) and at least one movable contact part (such as a movable contact) for each pole, the fixed contact part and the movable contact part are connected or disconnected with each other when the circuit breaker is closed/opened, an arc extinguishing system 6 is arranged below a contact area, and an arc generated when the movable contact part and the fixed contact part are connected or disconnected is extinguished by the arc extinguishing system 6.

The utility model relates to a fixed contact part, movable contact part and arc extinguishing system 6 among this type of circuit breaker. Specifically, the fixed contact part is a fixed contact component 2, the movable contact part is a movable contact component 3, and the movable contact component 3 is in contact with or separated from the fixed contact component 2 to realize switching on and switching off operations and is used for controlling the on and off of a circuit of the circuit breaker. The movable contact component 3 includes a movable contact 31 rotatably disposed on the housing 1, a movable terminal 33 fixedly disposed on the housing 1, and a flexible connection 32 having two ends electrically connected to the movable contact 31 and the movable terminal 33, respectively. The static contact component 2 comprises a static contact 21 and a static terminal 22, and the static contact 21 and the static terminal 22 are electrically connected. The moving contact 31 is provided with a moving contact 311, the fixed contact 21 is provided with a fixed contact 211, and the moving contact 311 is contacted with or separated from the fixed contact 211 to realize the on-off of a conductive loop. The conductive loop is formed by: in this embodiment, the static contact 21 and the static terminal 22 are an integral part, the other end of the static contact 21 is electrically connected to one end of the movable contact 31, the other end of the movable contact 31 is electrically connected to one end of a flexible connection 32, the other end of the flexible connection 32 is electrically connected to one end of a movable terminal 33, and the other end of the movable terminal 33 is electrically connected to an external circuit as an outgoing line end.

The arc extinguishing system 6 comprises an arc extinguishing chamber 63, a static arc striking plate 61 and a dynamic arc striking plate 62. The arc extinguishing chamber 63 is arranged at the bottom of the shell 1; one end of the static arc striking plate 61 is electrically connected with the static contact 21, and the other end extends to one side of the arc extinguishing chamber 63; one end of the movable arc striking plate 62 is electrically connected with the movable terminal 33, and the other end extends to the other side of the arc extinguishing chamber 63, so that the movable contact 3 has the same potential and does not interfere with the movable contact 31 at the opening position.

With continued reference to fig. 1, when the movable contact 31 is in the open position, the included angle θ between the flexible connection 32 and the movable contact 31 is an acute angle. Specifically, one end of the movable contact 31 is hinged to the housing 1, and the other end is a free end, and the entire movable contact 31 rotates around a pivot point. One end of the flexible connection 32 is welded at the side of the pivot point, the other end is welded on the movable terminal 33, and the pivot point is positioned above the height direction of the movable terminal 33, so that an included angle theta with a downward opening is formed. When the circuit breaker is in the opening position, i.e. the movable contact 31 is in the open position, the included angle θ is an acute angle smaller than 90 °, and may be 45 ° or other angles.

Thereby improve the breaking capacity of circuit breaker in order to improve the opening speed of moving contact 31, the utility model discloses still including a setting at the first stop device 4 between flexible coupling 32 and moving contact 31 for backstop flexible coupling 32 is to the one side skew that is close to moving contact 31. The first limiting device 4 needs to be arranged at a position close to the flexible connection 32 as much as possible, so that a maximum angle can be formed between the movable contact 31 and the flexible connection 32 when the circuit breaker is opened and arc extinction is satisfied. Theoretically, the larger the angle is, the smaller the electromotive force of the soft connection 32 on the movable contact 31 is, the faster the movable contact can reach the opening position, so that the generated arc can be transferred to the movable arc striking plate 62 more quickly, and the arc extinction is realized.

Further, the first limiting device 4 may be of a shaft-like structure, at least one end of which is fixedly disposed on the housing 1, or of a plate-like structure, and fixed on the housing 1 in a clamping manner, or of a block-like structure, which is feasible, and various shapes and fixing manners are possible as long as the same technical effect is achieved.

More preferably, the first position-limiting device 4 is a magnetic component for magnetically shielding the flexible connection 32, so that the repulsion speed of the movable contact 31 is not affected by the electromotive force of the flexible connection 32, and the breaking capacity can be further improved. The magnetic component can be a ferromagnetic component or other magnetic components, and the surface of the magnetic component is subjected to insulation treatment.

On the other hand, when the circuit breaker separating brake, flexible coupling 32 receive the influence of moving contact 31 electrodynamic force, can be to operating device one side skew to cause the interference to operating device's motion, influence the normal branch of circuit breaker and divide, from this, the utility model discloses still be provided with second stop device 5 in one side of the relative first stop device 4 of flexible coupling 32 for backstop flexible coupling 32 is to keeping away from moving contact 31 one side skew, just so makes flexible coupling 32 be located between first stop device 4 and the second stop device 5, has realized spacing to flexible coupling 32. Furthermore, because the second limiting device 5 is arranged between the flexible connection 32 and the operating mechanism, the flexible connection 32 and the operating mechanism can be isolated, and metal particles are prevented from polluting the operating mechanism in the breaking process, so that the breaking failure is avoided. The second limiting device 5 is generally of a plate-shaped structure.

It should be noted that, when the flexible connection 32 is affected by the electromotive force of the movable contact 31 and shifts to one side of the operating mechanism, the movable contact 31 will be subjected to a pulling force of the flexible connection 32 to obtain a clockwise torque, which is opposite to the repelling direction of the movable contact 31, and will slow down the repelling speed of the movable contact 31, thereby affecting the opening of the circuit breaker. Therefore, the connection point between the flexible connection 32 and the movable contact 31 can be properly changed, that is, the connection point moves downward, and the connection point between the flexible connection 32 and the movable contact 31 is located between the movable contact 311 of the movable contact 31 and the rotation center of the movable contact 31 (i.e., the pivot point of the movable contact 31), so that the flexible connection 32 provides the movable contact 31 with a counterclockwise torque, and thus, the flexible connection can be in the same direction as the repelling direction of the movable contact 31, the repelling speed of the movable contact 31 is increased, and the breaking capacity of the circuit breaker is improved.

Besides, the first limiting device 4 can also limit the opening angle of the movable contact 31. Namely, when the circuit breaker is opened, the movable contact 31 contacts the first position-limiting device 4, so that the movement range of the movable contact 31 is limited.

The utility model discloses a behind this kind of structure, under the assurance moving contact 31 pivoted condition, carry on spacingly to flexible coupling 32 through first stop device 4. When the breaker is opened, the flexible connection 32 can be limited to deviate towards one side of the movable contact 31, so that the included angle theta between the flexible connection 32 and the movable contact 31 is increased, the electric repulsion force F between the movable contact 31 and the flexible connection 32 is effectively reduced when short-circuit current is broken, the opening speed of the movable contact 31 is increased, electric arcs 7 between the movable contact 3 and the static contact 2 can be quickly transferred to the static arc striking plate 61 and the movable arc striking plate 62, enter the arc extinguishing chamber 63 under the action of electric force and are completely cut by the grid plates, and therefore the breaking capacity of the breaker at high rated voltage is improved.

Claims

1. The utility model provides a circuit breaker, includes casing (1) and the contact system of setting in casing (1), the contact system including static contact subassembly (2) and moving contact subassembly (3), static contact subassembly (2) including static contact (21), moving contact subassembly (3) including moving contact (31) that the rotation set up, fixed moving terminal (33) and both ends that set up on casing (1) respectively with moving contact (31) and moving flexible coupling (32) that moving terminal (33) are connected, the break-make of circuit breaker circuit is realized with the separation to the contact through static contact (21) and moving contact (31), wherein, form an acute angle between flexible coupling (32) and moving contact (31) when moving contact (31) are in the open position, its characterized in that: the device also comprises a first limiting device (4) arranged between the flexible connection (32) and the moving contact (31) and used for stopping the flexible connection (32) from shifting to one side close to the moving contact (31).

2. A circuit breaker as claimed in claim 1, characterized in that said first limiting means (4) are magnetic elements for magnetically shielding the flexible connection (32).

3. A circuit breaker according to claim 1, wherein said first limiting means (4) is of a shaft-like structure and is fixedly arranged at least one end on said housing (1).

4. The circuit breaker according to claim 1, wherein the first position-limiting device (4) is a plate-shaped structure and is fixed on the housing (1) in a clamping manner.

5. A circuit breaker according to claim 1, further comprising a second limiting means (5) arranged on a side of the flexible connection (32) opposite to the first limiting means (4) for stopping the flexible connection (32) from shifting to a side away from the movable contact (31).

6. A circuit breaker according to claim 1, characterized in that the connection point of the flexible connection (32) to the movable contact (31) is located between the movable contact (311) of the movable contact (31) and the center of rotation of the movable contact (31), so that the flexible connection (32) imparts a torque in the same direction as the repelling direction of the movable contact (31) from the movable contact (31).