Combined circuit breaker contact system module unit

Abstract

A combined circuit breaker contact system module unit comprises a base, a moving contact, a static contact, a static contact support, a moving contact shaft, a moving contact spring, an arc isolation cover, an arc baffle, an arc extinguish chamber and a top cover. Each pole of the moving contact and the static contact is composed of two groups of moving contacts and two groups of static contacts, the two groups of moving contacts are connected in series through flexible connection, the two groups of moving contacts are installed on the static contact support after being connected in series, and the two groups of static contacts are respectively located at wire inlet ends and wire outlet ends of the moving contacts; the arc isolating cover is arranged between the two moving contacts; the moving contact spring is arranged between the two groups of moving contacts to provide contact rotation power; the moving contact shaft passes through the static contact bracket, the two groups of moving contacts and the contact spring; the two groups of moving contacts are connected with the static contacts and then are fixed on the base; the arc extinguish chamber is positioned above each pole of contact system; and the top cover is fixed on the base. According to the invention, the current limiting capability and the breaking capability are effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of circuit breakers and relates to a circuit breaker contact system. The contact system is manufactured into a separate unit module. Background Art

[0002] Circuit breakers are important components of power distribution systems. They have protection functions such as overload and short circuit, and are mainly used to distribute electrical energy and protect lines and equipment from damage or reduce damage. The contact system of the circuit breaker is the core component of the circuit breaker that carries electrical energy and breaks current, and plays the role of connecting, disconnecting and protecting the current. Conventional circuit breakers are mainly based on single-breakpoint structures. In order to improve the performance of circuit breakers and improve the current limiting capacity of circuit breakers, major circuit breaker manufacturers have developed dual-breakpoint circuit breaker contact systems. Products using this technology have been widely used in the market and are well known to people.

[0003] The circuit breaker contact system has obvious advantages in current limiting capacity after adding breakpoints. With the continuous increase in the capacity of the power system, the demand for circuit breakers with high breaking capacity is more widespread, and higher requirements are put forward for the circuit breakers with single or double breakpoint contact systems in low-voltage complete sets of cabinets. Summary of the invention

[0004] In order to overcome the shortcomings of existing circuit breakers in terms of current limiting capacity and breaking capacity that cannot meet the growing power demand, the present invention provides a combined circuit breaker contact system module unit, which can directly add contact system breakpoints to the existing circuit breakers in use, effectively improving the performance of current limiting capacity and breaking capacity.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A modular unit of a combined circuit breaker contact system comprises a base, moving and static contacts, a static contact support, a moving contact shaft, a moving contact spring, an arc shield, an arc baffle, an arc extinguishing chamber and a top cover; each pole of the moving and static contacts is composed of two groups of moving contacts and two groups of static contacts, the two groups of moving contacts are connected in series through a soft connection, the two groups of moving contacts are installed on the static contact support after being connected in series, and the two groups of static contacts are respectively located at the incoming end and the outgoing end of the moving contact; the arc shield is installed between the two moving contacts; the moving contact spring is installed between the two groups of moving contacts to provide contact rotation power, the moving contact shaft passes through the static contact support, the two groups of moving contacts and the contact spring; the two groups of moving contacts are fixed on the base after being connected with the static contact; the arc extinguishing chamber is located above the contact system of each pole; the top cover is fixed on the base.

[0007] Furthermore, there are positioning holes on the left and right sides of the static contact bracket for passing the moving contact shaft, and limit points are provided above the front and rear sides of the static contact bracket for limiting the rotation position of the moving contact. Positioning bosses are provided below the front and rear sides for positioning the static contact bracket in the base to prevent rotation, and a matching groove is provided in the base for positioning.

[0008] Furthermore, the moving contact comprises a moving contact rod, a moving contact point is welded on the upper side of the moving contact rod, and two ends of the flexible connection are respectively welded to welding notches at the bottom of the moving contact rod.

[0009] Furthermore, a limiting protrusion is provided on one side of the bottom of the moving contact rod and matches with the upper limit position of the stationary contact bracket.

[0010] The middle and lower part of the moving contact rod is provided with an axial hole matched with the moving contact shaft.

[0011] A static contact point is welded on the upper end of the terminal plate of the static contact.

[0012] The technical concept of the present invention is as follows: the internal structure of the combined circuit breaker contact system module unit is a set of double-breakpoint contact systems, and the entire module unit is a separate product accessory, which can be connected in series with the existing single-breakpoint or double-breakpoint circuit breaker body to form a three-breakpoint or four-breakpoint high-performance circuit breaker.

[0013] The beneficial effects of the present invention are mainly manifested in that: the combined circuit breaker contact system module unit has two groups of moving and static contacts to form a double-breakpoint unit module, and the unit module provides contact pressure through a contact spring to ensure the reliability of contact contact; when a large current passes through the two groups of moving contacts connected in series, the moving and static contacts are repelled separately by the electric repulsion between the moving and static contacts to achieve the function of disconnecting the circuit; the present invention provides users with a combined circuit breaker contact system module unit that can be quickly installed on an existing circuit breaker and is in the form of a separate accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the internal structure diagram of the modular unit of the combined circuit breaker contact system.

[0015] Figure 2 It is a schematic diagram of the appearance and structure of the modular unit of the combined circuit breaker contact system.

[0016] Figure 3 It is a schematic diagram of the moving and static contact components of the modular unit of the combined circuit breaker contact system.

[0017] Figure 4 It is a structural diagram of the mounting bracket of the modular unit of the combined circuit breaker contact system.

[0018] Figure 5It is a structural diagram of two sets of moving contacts in the modular unit of the combined circuit breaker contact system.

[0019] Figure 6 It is a structural diagram of two sets of static contacts in the modular unit of the combined circuit breaker contact system.

[0020] Figure 7 It is a schematic diagram of a new high-performance circuit breaker formed by connecting the modular unit of the combined circuit breaker contact system with the circuit breaker body.

[0021] Figure 8 It is a schematic diagram of the connection between the modular unit of the combined circuit breaker contact system and the circuit breaker body. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Reference Figures 1 to 8 , a modular unit of a combined circuit breaker contact system, comprising a base 22, a moving contact 24, a stationary contact support 243, a moving contact shaft 245, a moving contact spring 244, an arc shield 27, an arc extinguishing chamber 28 and a top cover 21;

[0024] The moving contact 24 is fixedly mounted on the base 22, and the incoming line static contact 23 and the outgoing line static contact 26 of the module unit are respectively fixedly mounted on the base 22; the arc isolation cover 27 is installed between the two moving contacts, the arc extinguishing chamber 28 is installed above the moving and static contacts of each pole, the arc baffle plate 29 is installed in a slot on the incoming line side of the base, and the top cover 21 is fixedly mounted above the base 22 by fixing screws 20.

[0025] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 , a combined circuit breaker contact system module unit, the two groups of moving contacts 241 of the moving contact component 24 are welded by soft connection to form a back-to-back series structure, and the two contacts are respectively facing the incoming end and the outgoing end. The contact spring 244 is installed in the middle of the two groups of moving contacts 241, and the moving contact shaft 245 passes through the static contact bracket 243, the contact spring 244 and the moving contact 241 to form the moving contact component 24.

[0026] Reference Figure 4, a modular unit of the contact system of a combined circuit breaker, a positioning hole 243d1 for passing the moving contact shaft is provided on the left and right sides of the stationary contact bracket 243, a limiting point 243a1 for limiting the rotation position of the moving contact is provided on the front and rear sides of the stationary contact bracket 243, and a positioning boss 243b1 for positioning the stationary contact bracket 243 in the base 22 to prevent rotation is provided on the front and rear sides, and a matching groove is provided in the base 22 for positioning; a threaded hole 243c1 is provided in the middle of the stationary contact bracket 243 for fixed connection with the base 22.

[0027] Reference Figure 5 , a modular unit of a combined circuit breaker contact system, the moving contact 24 includes a moving contact rod 241, a moving contact point 242 is welded above the moving contact rod 241, and both ends of the soft connection 24a2 are respectively welded to the bottom welding notches of the moving contact rod 241.

[0028] Furthermore, a limiting protrusion 24a1 is provided on one side of the bottom of the movable contact rod 241 to cooperate with the upper limit position 243a1 of the stationary contact bracket 243.

[0029] Furthermore, a shaft hole 24 b matching with the moving contact shaft 245 is provided in the middle and lower part of the moving contact rod 241 .

[0030] Reference Figure 3 and Figure 6 , a modular circuit breaker contact system module unit, the upper end of the wiring board 231 of the incoming static contact 23 is welded with an incoming static contact 232, and the upper end of the wiring board 261 of the outgoing static contact 26 is welded with an outgoing static contact 262.

[0031] Reference Figure 8 , schematic diagram of connection between combined circuit breaker contact system module unit and circuit breaker body, the circuit breaker body 1 is an existing conventional circuit breaker with single breakpoint or double breakpoint, the incoming line end of the circuit breaker body is provided with a circuit breaker body wiring board 1a; the outgoing line end of the combined circuit breaker contact system module unit 2 is provided with a stationary contact module wiring board 2a, the stationary contact module wiring board 2a and the circuit breaker body wiring board 1a are fixedly connected by connecting screws 3 to form a series connection.

[0032] Reference Figure 7 The combined circuit breaker contact system module unit 2 can be used as a separate accessory to form a new three-breakpoint and four-breakpoint circuit breaker with the existing single-breakpoint and double-breakpoint circuit breakers. After the combination, a decorative panel 4 is installed above the connection between the two to form a new high-performance circuit breaker, which solves the problem of backward performance indicators of circuit breakers in existing usage occasions, facilitates operation and achieves the effect of improving quality and reducing costs.

[0033] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A modular circuit breaker contact system unit, characterized in that: It includes a base, moving and static contacts, a static contact bracket, a moving contact shaft, a moving contact spring, an arc shield, an arc baffle, an arc extinguishing chamber and a top cover; each pole of the moving and static contacts consists of 2 groups of moving contacts and 2 groups of static contacts, the two groups of moving contacts are connected in series through soft connections, the two groups of moving contacts are installed on the static contact bracket after being connected in series, and the two groups of static contacts are respectively located at the incoming end and the outgoing end of the moving contact; the arc shield is installed between the two moving contacts; the moving contact spring is installed between the two groups of moving contacts to provide contact rotation power, the moving contact shaft passes through the static contact bracket, the two groups of moving contacts and the contact spring; the two groups of moving contacts are fixed on the base after being connected with the static contact; the arc extinguishing chamber is located above the contact system of each pole; the top cover is fixed on the base.

2. The combined circuit breaker contact system module unit according to claim 1, characterized in that: There are positioning holes for passing the moving contact shaft on the left and right sides of the stationary contact bracket, and limit points for limiting the rotation position of the moving contact are provided above the front and rear sides of the stationary contact bracket. Positioning bosses for positioning the stationary contact bracket in the base to prevent rotation are provided below the front and rear sides, and a matching groove is provided in the base for positioning.

3. The combined circuit breaker contact system module unit according to claim 1 or 2, characterized in that: The moving contact comprises a moving contact rod, a moving contact point is welded on the upper side of the moving contact rod, and two ends of the flexible connection are respectively welded and connected to welding notches at the bottom of the moving contact rod.

4. The combined circuit breaker contact system module unit according to claim 3, characterized in that: A limiting protrusion is provided on one side of the bottom of the moving contact rod and matches with the upper limit position of the stationary contact bracket.

5. The combined circuit breaker contact system module unit according to claim 3, characterized in that: The middle and lower part of the moving contact rod is provided with an axial hole matched with the moving contact shaft.

6. The combined circuit breaker contact system module unit according to claim 1 or 2, characterized in that: A static contact point is welded on the upper end of the terminal plate of the static contact.

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