Combined circuit breaker contact system module unit

Abstract

A combined circuit breaker contact system module unit, comprising a base, a moving and static contact, a static contact support, a moving contact shaft, a moving contact spring, an arc separation cover, an arc baffle, an arc chamber and a top cover; the moving and static contact has two groups of moving contacts and two groups of static contacts per pole, the two groups of moving contacts are connected in series through a 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 the incoming line end and the outgoing line end of the moving contact; the arc separation cover is installed between the two moving contacts; the moving contact spring is installed between the two groups of moving contacts to provide a contact rotating 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 and the static contact are fixed on the base after being connected; the arc chamber is located above the contact system per pole; and the top cover is fixed on the base. The application effectively improves the performance of current limiting capacity and breaking capacity.

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 crucial components in power distribution systems. They offer protection against overloads and short circuits, primarily used to distribute electrical energy and protect lines and equipment from damage or minimize damage. The circuit breaker's contact system is the core component that carries electrical energy and interrupts current, fulfilling the functions of connecting, disconnecting, and protecting the circuit. Conventional circuit breakers primarily utilize a single-breakpoint structure. To improve circuit breaker performance and current-limiting capability, major circuit breaker manufacturers have developed dual-breakpoint contact systems. Products utilizing this technology are now widely used in the market and are well-known.

[0003] The circuit breaker contact system has obvious advantages in current limiting capacity after adding breakpoints. As the capacity of the power system continues to increase, the demand for circuit breakers with high breaking capacity is more widespread, and higher requirements are placed on the circuit breakers with the original single or double breakpoint contact systems in low-voltage complete cabinets. Summary of the Invention

[0004] In order to overcome the shortcomings of existing circuit breakers in terms of current limiting 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 existing circuit breakers, effectively improving the current limiting and breaking capacity performance.

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

[0006] A modular unit for a combined circuit breaker contact system comprises a base, movable and static contacts, a static contact support, a movable contact shaft, a movable contact spring, an arc shield, an arc baffle, an arc extinguishing chamber, and a top cover. Each pole of the movable and static contacts comprises two sets of movable contacts and two sets of static contacts, the two sets of movable contacts being connected in series via a flexible connector. The two sets of movable contacts are mounted on the static contact support after being connected in series, with the two sets of static contacts being located at the incoming and outgoing ends of the movable contacts, respectively. The arc shield is mounted between the two movable contacts. The movable contact spring is mounted between the two sets of movable contacts to provide contact rotational power. The movable contact shaft passes through the static contact support, the two sets of movable contacts, and the contact spring. The two sets of movable contacts are fixed to the base after being connected to the static contacts. The arc extinguishing chamber is located above the contact system of each pole. The top cover is fixed to 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, and 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 includes a moving contact rod, a moving contact point is welded on the upper side of the moving contact rod, and both ends of the flexible connection are respectively welded to the 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 movable contact rod and matches the upper limit position of the static contact bracket.

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

[0011] The upper end of the terminal block of the static contact is welded with a static contact point.

[0012] The technical concept of the present invention is as follows: the internal structure of the modular unit of the combined circuit breaker contact system is a set of double-breakpoint contact systems. The entire modular unit is a separate product accessory that can be connected in series with an 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 comprises two sets of movable and static contacts forming a double-breakpoint unit module, the unit module provides contact pressure through a contact spring to ensure the reliability of contact; when a large current passes through the two sets of movable contacts connected in series, the movable and static contacts are repelled separately by the electric repulsive force between them, thereby achieving 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 This 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 external 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 This is a structural diagram of the mounting bracket for 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 This 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 with reference to the accompanying drawings.

[0023] Reference Figures 1 to 8 , a modular unit of a combined circuit breaker contact system, comprising a base 22, movable and static contacts 24, a static contact support 243, a movable contact shaft 245, a movable 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 static contact 23 and the outgoing 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 29 is installed in the slot on the incoming end 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 through soft connections to form a back-to-back series structure, with the two contacts facing the incoming line end and the outgoing line end respectively, and 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, combined circuit breaker contact system module unit, the left and right sides of the static contact bracket 243 each have a positioning hole 243d1 for passing the moving contact shaft, the front and rear sides of the static contact bracket 243 are provided with a limit point 243a1 for limiting the rotation position of the moving contact, and the front and rear sides are provided with a positioning boss 243b1 for positioning the static contact bracket 243 in the base 22 to prevent rotation, and the base 22 is provided with a matching groove for positioning; the middle of the static contact bracket 243 is provided with a threaded hole 243c1 for fixed connection with the base 22.

[0027] Reference Figure 5 , combined circuit breaker contact system module unit, 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 notch 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 static contact bracket 243.

[0029] Furthermore, a shaft hole 24 b is provided in the middle and lower portion of the movable contact rod 241 to cooperate with the movable contact shaft 245 .

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

[0031] Reference Figure 8 , schematic diagram of the connection between the combined circuit breaker contact system module unit and the circuit breaker body, the circuit breaker body 1 is a conventional circuit breaker with an existing single breakpoint or double breakpoint, and the circuit breaker body terminal block 1a is provided at the incoming line end of the circuit breaker body; the combined circuit breaker contact system module unit 2 has a static contact module terminal block 2a at the outgoing line end, and the static contact module terminal block 2a and the circuit breaker body terminal block 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, as a separate accessory, can be combined with the existing single-breakpoint and double-breakpoint circuit breakers to form a new three-breakpoint and four-breakpoint circuit breaker. 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 lagging performance indicators of circuit breakers in existing usage scenarios, facilitates operation and achieves the effect of improving quality and reducing costs.

[0033] The embodiments of this specification are merely examples of implementations of the invention and are provided for illustrative purposes only. The scope of protection of the present invention should not be considered limited to the specific embodiments described in these embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by a person of ordinary skill in the art based on the invention.

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 two groups of moving contacts and two groups of static contacts, and the two groups of moving contacts are connected in series through a flexible connection. 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, and 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 to the base after being connected to the static contact; the arc extinguishing chamber is located above the contact system of each pole; and the top cover is fixed to the base; There are positioning holes on the left and right sides of the static contact bracket for passing the moving contact shaft. Limiting 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. The base is provided with a matching groove for positioning. The moving contact comprises a moving contact rod, a moving contact point is welded on the top of the moving contact rod, and both ends of the flexible connection are respectively welded to the welding notches at the bottom of the moving contact rod; One side of the bottom of the movable contact rod is provided with a limiting protrusion that matches the upper limit position of the static contact bracket.

2. The modular circuit breaker contact system unit according to claim 1, wherein: The middle and lower part of the moving contact rod is provided with an axis hole matched with the moving contact shaft.

3. The modular unit of the combined circuit breaker contact system according to claim 1, wherein: The upper end of the terminal plate of the static contact is welded with a static contact point.

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