Moving contact assembly of circuit breaker

Abstract

The utility model discloses a moving contact assembly of a circuit breaker, which comprises a left baffle plate and a right baffle plate, an installation cavity is formed between the left baffle plate and the right baffle plate, a moving contact assembly is installed in the installation cavity through a connecting shaft, a contact support plate is arranged above the moving contact assembly, and the contact support plate is arranged above the moving contact assembly. The two sides of the inner wall of the contact supporting plate are connected with the outer walls of the left baffle and the right baffle, the inner wall of the contact supporting plate is connected with the moving contact assembly through a spring, and the outer walls of the rear ends of the left baffle and the right baffle are fixedly connected with a rotating shaft used for synchronous connection. According to the scheme, the moving contact assembly is composed of the main contact and the auxiliary contacts, and the moving silver point, the auxiliary moving silver point, the auxiliary static silver point and the static silver point are arranged at the same time, so that the breaking capacity of the moving and static contact system is improved, and the electrical life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a moving contact assembly of a circuit breaker. Background Art

[0002] A frame-type circuit breaker is a mechanical switching device that can connect, carry, and disconnect current under normal circuit conditions. It can also connect, carry for a certain time, and disconnect current under specified abnormal conditions. Existing frame-type circuit breakers usually include a drawer box, an operating mechanism, a contact system, a conductive system, and an arc extinguishing system.

[0003] However, the existing moving contact assembly has a relatively simple structural design. During the cooperation process between the moving contact assembly and the static contact assembly, the moving contact assembly is not equipped with an auxiliary arc-striking moving contact, resulting in poor breaking capacity of the moving and static contact system and reduced electrical life. In addition, during the disconnection process between the moving contact assembly and the static contact system, the moving contact assembly has a problem of poor synchronization, thereby affecting the service life of the circuit breaker. Summary of the Invention

[0004] The purpose of the present utility model is to provide a moving contact assembly for a circuit breaker to solve the problems mentioned in the above background art, such as the relatively simple structural design of the existing moving contact assembly, the lack of an auxiliary arc-striking moving contact in the moving contact assembly during the cooperation process between the moving contact assembly and the static contact assembly, resulting in poor breaking capacity of the moving and static contact system and reduced electrical life; and the poor synchronization of the moving contact assembly during the disconnection process between the moving contact assembly and the static contact system, thereby affecting the service life of the circuit breaker.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a moving contact assembly of a circuit breaker, comprising a left baffle and a right baffle, wherein an installation cavity is formed between the left baffle and the right baffle, and a moving contact assembly is installed in the installation cavity via a connecting shaft, a contact support plate is provided above the moving contact assembly, and both sides of the inner wall of the contact support plate are connected to the outer walls of the left baffle and the right baffle, the inner wall of the contact support plate is connected to the moving contact assembly via a spring, and a rotating shaft for synchronous connection is fixedly connected to the outer walls of the rear ends of the left baffle and the right baffle.

[0006] Preferably, the rear end of the moving contact assembly is connected to the moving contact wiring board via a flexible connecting line, and the front end of the moving contact assembly is movably connected to the static contact assembly by rotation.

[0007] Preferably, an arc shield is installed on the bottom surface of the moving contact assembly close to the static contact assembly.

[0008] Preferably, the moving contact assembly consists of multiple main contacts and multiple auxiliary contacts, the middle of the multiple main contacts are arranged on the multiple auxiliary contacts, the surfaces of the main contacts and the auxiliary contacts are both provided with connecting holes, and the connecting holes are plugged with connecting shafts.

[0009] Preferably, the main contact comprises a main contact blade and a movable silver point, and the movable silver point is provided on the bottom surface of the main contact blade.

[0010] Preferably, the auxiliary contact comprises an auxiliary main contact blade, an auxiliary moving silver point and a moving silver point. The auxiliary moving silver point and the moving silver point are provided on the bottom surface of the auxiliary main contact blade, and the auxiliary moving silver point is located at the front end of the moving silver point.

[0011] Preferably, the static contact assembly includes a static contact terminal plate, an arc-starting plate, an auxiliary static silver point and a static silver point. The auxiliary static silver point and the static silver point are provided on the top of the static contact terminal plate. The auxiliary static silver point is located at the front end of the static silver point. The arc-starting plate is fixedly connected to the bend at the bottom of the static contact terminal plate.

[0012] Beneficial effects

[0013] Compared with the existing technology, the beneficial effects of the present invention are:

[0014] By adopting the above scheme, the moving contact assembly is composed of a main contact and multiple auxiliary contacts, and a moving silver point and an auxiliary moving silver point, as well as an auxiliary static silver point and a static silver point are set at the same time, thereby improving the breaking capacity and electrical life of the moving and static contact system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall coordination structure of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the moving contact assembly of the present utility model;

[0017] Figure 3 This is a schematic structural diagram of the static contact assembly of the present utility model;

[0018] Figure 4 This is a schematic diagram of the main contact structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the auxiliary contact structure of the utility model.

[0020] In the figure: 1. Left baffle; 2. Right baffle; 3. Mounting cavity; 4. Moving contact assembly; 5. Contact support plate;

[0021] 6. Spring; 7. Arc shield; 8. Connecting shaft; 9. Rotating shaft; 10. Moving contact terminal board;

[0022] 11. Stationary contact assembly; 12. Flexible connecting wire; 41. Main contact; 42. Auxiliary contact;

[0023] 111. Static contact terminal board; 112. Static silver point; 113. Auxiliary static silver point; 114. Arc starting plate;

[0024] 411. Main contact blade; 412. Moving silver point; 413. Connecting hole; 421. Auxiliary main contact blade; 422. Auxiliary moving silver point. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," "vertical," and "horizontal" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0027] like Figure 1-5 It is a structural schematic diagram of a moving contact assembly of a circuit breaker in a preferred embodiment of the present invention. In this embodiment, a moving contact assembly of a circuit breaker includes a left baffle 1 and a right baffle 2. A mounting cavity 3 is formed between the left baffle 1 and the right baffle 2. A moving contact assembly 4 is installed in the mounting cavity 3 through a connecting shaft. A contact support plate 5 is provided above the moving contact assembly 4, and both sides of the inner wall of the contact support plate 5 are connected to the outer walls of the left baffle 1 and the right baffle 2. The inner wall of the contact support plate 5 is connected to the moving contact assembly 4 through a spring 6, and two springs 6 are used between each moving contact assembly and the inner wall of the contact support plate 5 to provide pressure during contact and rapid rebound of the moving contact when disconnected. The outer walls of the rear ends of the left baffle 1 and the right baffle 2 are fixedly connected with a rotating shaft 9 for synchronous connection. This structural design enables multiple moving contact assemblies 4 to be connected through the core through the rotating shaft 9.

[0028] In this embodiment, the rear end of the moving contact assembly 4 is connected to the moving contact wiring board 10 via a flexible connecting line 12 , and the front end of the moving contact assembly 4 is movably connected to the static contact assembly 11 by rotation.

[0029] In this embodiment, an arc shield 7 is installed on the bottom surface of the moving contact assembly 4 close to the static contact assembly 11. This structural design enables the arc shield 7 to effectively block the arc from entering the flexible connecting wire 12 when in the closed state.

[0030] In this embodiment, the moving contact assembly 4 consists of multiple main contacts 41 and multiple auxiliary contacts 42. The multiple auxiliary contacts 42 are arranged in the middle of the multiple main contacts 41. Connecting holes 413 are opened on the surfaces of the main contacts 41 and the auxiliary contacts 42. The connecting holes 413 are plugged into the connecting shaft 8. The multiple main contacts 41 and the multiple auxiliary contacts 42 are assembled through the core using the connecting shaft 8. Its design protects the synchronization of the multiple main contacts 41 and the multiple auxiliary contacts 42.

[0031] In this embodiment, the main contact 41 includes a main contact blade 411 and a movable silver point 412, and the movable silver point 412 is provided on the bottom surface of the main contact blade 411. The auxiliary contact 42 includes an auxiliary main contact blade 421, an auxiliary movable silver point 422 and a movable silver point 412, and the auxiliary main contact blade 421 is provided with an auxiliary movable silver point 422 and a movable silver point 412 on the bottom surface, and the auxiliary movable silver point 422 is located at the front end of the movable silver point 412. Through the above structural design, the current conduction performance of the circuit breaker is improved, and the breaking process capability is also improved.

[0032] In this embodiment, the static contact assembly 11 includes a static contact terminal plate 111, an arc-striking plate 114, an auxiliary static silver point 113 and a static silver point 112. The auxiliary static silver point 113 and the static silver point 112 are provided on the top of the static contact terminal plate 111. The auxiliary static silver point 113 is located at the front end of the static silver point 112. The arc-striking plate 114 is fixedly connected to the bend at the bottom of the static contact terminal plate 111.

[0033] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A moving contact assembly of a circuit breaker, comprising a left baffle (1) and a right baffle (2), characterized in that: An installation cavity (3) is formed between the left baffle (1) and the right baffle (2), a moving contact assembly (4) is installed in the installation cavity (3) via a connecting shaft, a contact support plate (5) is provided above the moving contact assembly (4), and both sides of the inner wall of the contact support plate (5) are connected to the outer walls of the left baffle (1) and the right baffle (2), the inner wall of the contact support plate (5) is connected to the moving contact assembly (4) via a spring (6), and a rotating shaft (9) for synchronous connection is fixedly connected to the outer walls of the rear ends of the left baffle (1) and the right baffle (2).

2. The movable contact assembly of a circuit breaker according to claim 1, characterized in that: The rear end of the moving contact assembly (4) is connected to a moving contact wiring board (10) via a flexible connecting line (12), and the front end of the moving contact assembly (4) is movably connected to a stationary contact assembly (11) via a rotational manner.

3. The movable contact assembly of a circuit breaker according to claim 2, characterized in that: An arc shield (7) is installed on the bottom surface of the moving contact assembly (4) relatively close to the static contact assembly (11).

4. The movable contact assembly of a circuit breaker according to claim 2, characterized in that: The moving contact assembly (4) comprises a plurality of main contacts (41) and a plurality of auxiliary contacts (42); the plurality of auxiliary contacts (42) are arranged in the middle of the plurality of main contacts (41); the surfaces of the main contacts (41) and the auxiliary contacts (42) are both provided with connection holes (413); and a connection shaft (8) is plugged into the connection hole (413).

5. The movable contact assembly of a circuit breaker according to claim 4, characterized in that: The main contact (41) comprises a main contact blade (411) and a movable silver point (412); the movable silver point (412) is provided on the bottom surface of the main contact blade (411).

6. The movable contact assembly of a circuit breaker according to claim 4, characterized in that: The auxiliary contact (42) comprises an auxiliary main contact blade (421), an auxiliary movable silver point (422) and a movable silver point (412); the auxiliary movable silver point (422) and the movable silver point (412) are provided on the bottom surface of the auxiliary main contact blade (421), and the auxiliary movable silver point (422) is located at the front end of the movable silver point (412).

7. The movable contact assembly of a circuit breaker according to claim 2, characterized in that: The static contact assembly (11) comprises a static contact terminal plate (111), an arc striking plate (114), an auxiliary static silver point (113) and a static silver point (112); the auxiliary static silver point (113) and the static silver point (112) are provided on the top of the static contact terminal plate (111); the auxiliary static silver point (113) is located at the front end of the static silver point (112); and the arc striking plate (114) is fixedly connected to a bent portion of the bottom of the static contact terminal plate (111).

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