Static contact for a circuit breaker

Abstract

The utility model discloses a static contact for circuit breaker, aims at providing a static contact for circuit breaker convenient to installation and long service life of contact, and its technical scheme main points are including contact body, its characterized in that, the contact body includes contact part, fixed part and sets up the connecting portion between contact part and fixed part, the connecting portion is composed of two parallel connecting rods, and the included angle of connecting rod and contact part, fixed part all are obtuse angle and the angle is same, a plurality of mounting screw holes that pass through fixed part are equipped on the fixed part, contact piece is equipped on the contact part, a plurality of contact springs are equipped between the contact part and contact piece, and the both ends of contact spring are fixedly connected with contact part and contact piece respectively, the utility model is applicable to electrical equipment technical field.

Description

Technical Field

[0001] This utility model relates to a stationary contact for circuit breakers, and more specifically, it relates to a stationary contact for circuit breakers that is easy to install and has a long service life. Background Technology

[0002] Circuit breakers are core equipment in low-voltage power distribution systems. Their performance directly determines the volume and current carrying capacity of related electrical equipment. As one of the key components of a circuit breaker, the performance of the stationary contact directly affects the performance of the circuit breaker. It is usually required to have good conductivity, low contact resistance, high resistance to welding, and high resistance to arc erosion.

[0003] Currently, in the market, the stationary contacts of circuit breakers are usually operated by the operating mechanism to achieve the contact and separation of the moving and stationary contacts. The repeated collisions of the two contacts during contact and separation will cause more wear on the contacts. In this process, an electric arc will also be generated. Usually, an arc-inducing structure is added near the stationary contact to eliminate the influence of the electric arc. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a stationary contact for circuit breakers that is easy to install and has a long service life.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stationary contact for a circuit breaker, comprising a contact body, the contact body including a contact portion, a fixing portion, and a connecting portion disposed between the contact portion and the fixing portion, the connecting portion consisting of two parallel connecting rods, the angles between the connecting rods and the contact portion and the fixing portion being obtuse angles and the same, the fixing portion having several mounting screw holes penetrating the fixing portion, the contact portion having a contact plate, and several contact springs being disposed between the contact portion and the contact plate, with both ends of the contact springs fixedly connected to the contact portion and the contact plate respectively.

[0006] By adopting the above technical solution, the stationary contact of the circuit breaker of this utility model consists of three parts: a contact part, a fixing part, and a connecting part. The connecting part is composed of two parallel connecting rods, which together with the contact part and the fixing part form a hollow area, which can reduce the material cost and weight of the stationary contact. Several mounting screw holes through the fixing part can be used to strengthen the fixing effect. The contact part is provided with contact plates and contact springs, which can produce a buffering effect on the collision between the moving contact and the stationary contact, absorb part of the impact force, reduce the wear of the contact part, and extend its service life.

[0007] The present invention is further configured such that: a limiting rod is provided inside the contact spring, one end of the limiting rod is fixed on the contact part, and the other end passes through the contact piece.

[0008] By adopting the above technical solution, the limiting rod provided inside the contact spring is fixed on the contact part, and the other end passes through the contact piece. The limiting rod makes the contact piece move only in the direction of the length of the limiting rod, so that the contact position of the stationary contact and the moving contact will not be offset, thus satisfying the basic operating mode of the circuit breaker.

[0009] The present invention is further configured such that: the contact plate is provided with three arc-inducing feet and a pair of stationary contacts, the stationary contacts are arranged side by side at one end of the contact plate, and the arc-inducing feet are triangularly distributed at the other end of the contact plate.

[0010] By adopting the above technical solution, the three arc-initiating feet provided on the contact plate can enhance the arc-initiating effect of the stationary contact, and can promptly introduce the generated arc into the arc-extinguishing chamber of the circuit breaker to reduce the burn-out of the stationary contact, making it safer and more reliable to use. The stationary contact is a pair and is arranged side by side at one end of the contact plate, which can further improve the connection reliability of the stationary contact and assist in improving the arc-initiating effect of the arc-initiating feet.

[0011] The present invention is further configured such that: the mounting screw holes on the fixing part include a main screw hole and two auxiliary screw holes for auxiliary fixing, and the radius of the auxiliary screw holes is 2 / 5 of the radius of the main screw hole.

[0012] By adopting the above technical solution, the mounting screw holes provided on the fixing part are used to fix the stationary contact in the corresponding position. Secondly, the main screw hole and two auxiliary screw holes can work together to enhance the fixing effect. The radius of the auxiliary screw hole is set to 2 / 5 of the radius of the main screw hole to distinguish the screw holes. The arrangement of the three screw holes to form a triangle can further improve the fixing effect of the screw holes.

[0013] The present invention is further configured such that: the connection between the connecting rod and the contact part and the fixing part is chamfered, and the connecting rod is made of insulating material.

[0014] By adopting the above technical solution, the chamfering treatment at the connection between the connecting rod and the contact and fixing parts can effectively remove burrs, facilitate installation, prevent scratches and damage to other parts, reduce stress concentration at the edges, and extend service life. The connecting rod is made of insulating material to isolate current and prevent current from passing through the fixing part of the stationary contact, thus ensuring the safety and reliability of the circuit breaker.

[0015] The present invention is further configured such that: the fixing part is provided with raised texture, and the raised texture is composed of a plurality of insulating blocks.

[0016] By adopting the above technical solution, the raised texture of the fixing part is composed of several insulating blocks. The neatly arranged insulating blocks can further enhance the insulation effect, effectively preventing current from passing through the fixing part and the mechanical control part of the circuit breaker, thus comprehensively improving the overall safety of the circuit breaker. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the stationary contact for a circuit breaker according to the present invention;

[0018] Figure 2 This is a side view of an embodiment of the stationary contact for a circuit breaker according to this utility model;

[0019] The attached figures are labeled as follows: 1. Contact part; 2. Fixing part; 3. Connecting part; 4. Mounting screw hole; 41. Main screw hole; 42. Secondary screw hole; 5. Contact piece; 6. Contact spring; 7. Limiting rod; 8. Arc-starting foot; 9. Stationary contact; 10. Insulating block. Detailed Implementation

[0020] Reference Figures 1 to 2 The embodiments of the circuit breaker of this utility model are further described below.

[0021] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0023] A stationary contact for a circuit breaker includes a contact body, which comprises a contact portion 1, a fixing portion 2, and a connecting portion 3 disposed between the contact portion 1 and the fixing portion 2. The connecting portion 3 consists of two parallel connecting rods, the angles between the connecting rods and the contact portion 1 and the fixing portion 2 being obtuse angles of the same value. The fixing portion 2 has several mounting screw holes 4 penetrating through it. The contact portion 1 has a contact plate 5, and several contact springs 6 are disposed between the contact portion 1 and the contact plate 5, with both ends of the contact springs connected to the contact portion 1 and the contact plate 5 respectively. The contact piece 5 is fixedly connected. The stationary contact of this utility model circuit breaker consists of three parts: a contact part 1, a fixing part 2, and a connecting part 3. The connecting part 3 is composed of two parallel connecting rods. These connecting rods, the contact part 1, and the fixing part 2 form a hollow area, which can reduce the material cost and weight of the stationary contact. Several mounting screw holes 4 through the fixing part 2 can be used to strengthen the fixing effect. The contact part 1, with the contact piece 5 and contact spring 6, can buffer the collision between the moving contact and the stationary contact, absorb part of the impact force, and reduce the contact... To reduce wear on the head portion and extend its service life, the mounting screw holes 4 on the fixing part 2 include a main screw hole 41 and two auxiliary screw holes 42 for auxiliary fixing. The radius of the auxiliary screw holes 42 is 2 / 5 of the radius of the main screw hole 41. The mounting screw holes 4 on the fixing part 2 are used to fix the stationary contact head in a designated position. The combination of one main screw hole 41 and two auxiliary screw holes 42 can enhance the fixing effect. The radius of the auxiliary screw holes 42 is set to 2 / 5 of the radius of the main screw hole 41 to distinguish the screw holes. The arrangement of the three screw holes in a triangle can further improve the... The fixing effect of the screw holes can be adapted by adjusting the depth and number of screw holes according to the number and style of bolts in the mating parts. Specifically, the contact spring 6 is also provided with a limiting rod 7. One end of the limiting rod 7 is fixed to the contact part 1, and the other end passes through the contact piece 5. The limiting rod 7 ensures that the contact piece 5 can only move in the direction of the length of the limiting rod 7, and will not cause the contact position of the stationary contact and the moving contact to shift, thus satisfying the basic operating mode of the circuit breaker.

[0024] Furthermore, the contact piece 5 is provided with three arc-initiating feet 8 and a pair of stationary contacts 9. The stationary contacts 9 are arranged side by side at one end of the contact piece 5, and the arc-initiating feet 8 are triangularly distributed at the other end of the contact piece 5. The three arc-initiating feet 8 on the contact piece 5 can enhance the arc-initiating effect of the stationary contact and can promptly introduce the generated arc into the arc-extinguishing chamber of the circuit breaker to reduce the burn-out of the stationary contacts 9, making it safer and more reliable to use. The stationary contacts 9 are a pair and are arranged side by side at one end of the contact piece 5, which can further improve the connection reliability of the stationary contacts 9 and assist in improving the arc-initiating effect of the arc-initiating feet 8. When one of the stationary contacts 9 fails, the other stationary contact 9 can continue to operate.

[0025] As a further optimization design, the fixing part 2 is provided with raised textures, which are composed of several insulating blocks 10. The connection between the connecting rod and the contact part 1 and the fixing part 2 is chamfered. The connecting rod is made of insulating material. The raised textures on the fixing part 2 are composed of several insulating blocks 10. The neatly arranged insulating blocks 10 can further enhance the insulation effect, effectively preventing current from passing through the fixing part 2 and the mechanical control parts of the circuit breaker, thus comprehensively improving the overall safety of the circuit breaker. The chamfering treatment at the connection between the connecting rod and the contact part 1 and the fixing part 2 can effectively remove burrs, facilitate installation, prevent scratches and damage to other parts, reduce stress concentration at the edges, and extend service life. The insulating material of the connecting rod can isolate current and prevent current from passing through the fixing part 2 of the stationary contact, ensuring the safety and reliability of the circuit breaker. To enhance the insulation effect, the surface can also be insulated, such as by coating the surface with a metal oxide layer or electroplating a waste metal coating.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stationary contact for a circuit breaker, comprising a contact body, characterized in that, The contact body includes a contact part (1), a fixing part (2), and a connecting part (3) disposed between the contact part (1) and the fixing part (2). The connecting part (3) is composed of two parallel connecting rods. The angle between the connecting rods and the contact part (1) and the fixing part (2) is obtuse and the angle is the same. The fixing part (2) is provided with several mounting screw holes (4) that penetrate the fixing part (2). The contact part (1) is provided with a contact piece (5). Several contact springs (6) are provided between the contact part (1) and the contact piece (5), and the two ends of the contact springs (6) are fixedly connected to the contact part (1) and the contact piece (5) respectively.

2. A stationary contact for a circuit breaker according to claim 1, characterized in that, The contact spring (6) is provided with a limiting rod (7), one end of which is fixed on the contact part (1), and the other end passes through the contact piece (5).

3. A stationary contact for a circuit breaker according to claim 1, characterized in that, The contact piece (5) is provided with three arc-leading feet (8) and a pair of stationary contacts (9). The stationary contacts (9) are arranged side by side at one end of the contact piece (5), and the arc-leading feet (8) are arranged in a triangular pattern at the other end of the contact piece (5).

4. A stationary contact for a circuit breaker according to claim 1, characterized in that, The mounting screw hole (4) on the fixing part (2) includes a main screw hole (41) and two auxiliary screw holes (42) for auxiliary fixing. The radius of the auxiliary screw hole (42) is 2 / 5 of the radius of the main screw hole (41).

5. A stationary contact for a circuit breaker according to claim 1, characterized in that, The connection between the connecting rod and the contact part (1) and the fixing part (2) is chamfered, and the connecting rod is made of insulating material.

6. A stationary contact for a circuit breaker according to claim 1, characterized in that, The fixing part (2) is provided with raised texture, which is composed of several insulating blocks (10).

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