Layout structure of miniature circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and particularly discloses a layout structure of a miniature circuit breaker, which comprises a shell, arc extinguishing areas are symmetrically arranged on the left side and the right side of the lower part of an inner cavity of the shell, an arc running area and a thermal tripping area are arranged in the middle of the lower part of the inner cavity of the shell, and the arc running area and the thermal tripping area are overlapped. The arc extinguishing areas on the left side and the right side are communicated through the arc running area in the middle. Insulation isolation plates are arranged between the thermal tripping area and the arc extinguishing areas on the left side and the right side and between the thermal tripping area and the arc running area. According to the utility model, the capacity of the arc extinguish chamber is increased, the position structure of each system in the circuit breaker is reasonably arranged, especially the position layout design of the thermal tripping system is simple and compact, and the thermal tripping system is isolated from an arc running area on the back side and the left and right arc extinguish chambers on the left and right sides by using the insulating isolation plates, so that the reliability of the circuit breaker is improved. And the thermal tripping system is prevented from being interfered by electric arc burning and creepage.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, especially the layout structure of small circuit breaker. BACKGROUND

[0002] Circuit breaker refers to the switch device that can close, carry and open the current under normal or abnormal loop conditions. It is mainly composed of wiring terminal, arc extinguishing system, mechanism system, magnetic tripping system and thermal tripping system.

[0003] At present, for the micro circuit breaker, the mechanism system is often arranged in the upper part of the cavity of the shell, and the arc extinguishing system and the thermal tripping system are arranged in the left and right structure mode, as shown in the drawing, the arc extinguishing capacity of the arc extinguishing system of this mode is not high. Figure 1 Therefore, in order to improve the arc extinguishing capacity, the mode of double arc extinguishing chambers arranged in left and right symmetry can be adopted, but this occupies the position of the original thermal tripping system, as shown in the drawing, thereby leading to the difficulty in arranging the position of the thermal tripping system. Figure 2 UTILITY MODEL CONTENTS

[0004] The utility model discloses a layout structure of small circuit breaker.

[0005] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] The layout structure of small circuit breaker comprises a shell, arc extinguishing areas are symmetrically arranged at the left and right positions of the lower part of the cavity of the shell, and an arc extinguishing system is fixedly installed in the arc extinguishing area; an arc running area and a thermal tripping area are arranged at the middle position of the lower part of the cavity of the shell, a reverse V-shaped arc striking sheet is installed in the arc running area, the two arc extinguishing chambers are connected in series through the reverse V-shaped arc striking sheet to jointly participate in arc extinguishing, and a thermal tripping system is installed in the thermal tripping area; the arc running area and the thermal tripping area are arranged in front and back overlap mode, the arc extinguishing areas on the left and right sides are communicated through the arc running area in the middle, and an insulating isolation plate is arranged between the thermal tripping area and the arc extinguishing areas on the left and right sides and the arc running area.

[0007] The following is the technical scheme further defined by the utility model, a mechanism area is arranged at the middle position of the upper part of the cavity of the shell, and a mechanism system is installed in the mechanism area.

[0008] The following is the technical scheme further defined by the utility model, a magnetic tripping area is arranged at the left position of the upper part of the cavity of the shell, and a magnetic tripping system is installed in the magnetic tripping area.

[0009] The following is the technical scheme further defined by the utility model, wire inlet areas and wire outlet areas are arranged at the left and right ends of the shell, wire inlet wiring terminals are installed in the wire inlet areas, and wire outlet wiring terminals are installed in the wire outlet areas. ​

[0010] Compared with the prior art, the utility model has the following technical effects:

[0011] The utility model discloses the position structure of each system in the breaker is reasonably arranged while increasing the arc-extinguishing chamber capacity, especially the position arrangement design of the thermal trip system is simple and compact, and the thermal trip system is isolated from the arc running area on the back side and the left and right arc-extinguishing chambers on the left and right sides by using the insulating isolation plate, so that the thermal trip system is prevented from being interfered by arc burning and creeping.

[0012] The utility model is further described below in combination with the drawings and the embodiments. DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without paying creative labor for the ordinary skilled in the art.

[0014] Figure 1 It is the structural schematic diagram of the internal system arrangement of the breaker in the prior art;

[0015] Figure 2 It is the structural schematic diagram of the left and right symmetrical arrangement of the double arc-extinguishing chambers;

[0016] Figure 3 It is the structural schematic diagram of the arrangement of each system of the breaker in the utility model;

[0017] Figure 4 It is the current flow route map when the breaker in the utility model is opened;

[0018] Figure 5 It is the current flow route map when the breaker in the utility model is closed;

[0019] Figure 6 It is the three-dimensional structural schematic diagram of the utility model;

[0020] Figure 7 It is the structural schematic diagram of the inverted V-shaped arc leading piece in the utility model.

[0021] Reference: 1, arc extinguishing system; 101, left arc extinguishing chamber; 102, right arc extinguishing chamber; 103, left arc extinguishing grid; 104, right arc extinguishing grid; 2, thermal trip system; 3, mechanism system; 4, magnetic trip system; 5, incoming line terminal; 6, outgoing line terminal; 7, inverted V-shaped arc starting piece; 8, insulating isolation plate; 9, right arc starting piece; 10, Y-shaped equipotential arc starting piece; 11, static contact conducting piece; 12, thermal double gold piece; 13, trip lever; 14, tripping piece; 15, lead wire one; 16, lead wire two. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purpose, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a sufficient understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0024] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0025] As Figure 3As shown, the embodiment provides a layout structure of a miniature circuit breaker. The incoming terminal 5 is located at the left end of the circuit breaker housing, and the outgoing terminal 6 is located at the right end of the circuit breaker housing; the magnetic tripping system 4 is located at the left side of the upper part of the inner cavity of the circuit breaker housing; the mechanism system 3 is located at the middle of the upper part of the inner cavity of the circuit breaker housing; the left and right arc extinguishing systems 1 are symmetrically located at the left and right sides of the lower part of the inner cavity of the circuit breaker housing; the inverted V-shaped arc guiding piece 7 in the arc running area and the thermal tripping system 2 are both located at the middle of the lower part of the inner cavity of the circuit breaker housing, and the inverted V-shaped arc guiding piece 7 and the thermal tripping system 2 are arranged in front of and behind each other, that is, the thermal tripping system 2 is located at the back of the inverted V-shaped arc guiding piece 7, and then the thermal tripping system 2 is isolated from the left and right arc extinguishing systems 1 and the inverted V-shaped arc guiding piece 7 in the arc running area by the insulating isolation plate 8, so as to prevent the arc in the arc running area from affecting the thermal tripping system 2. It should be noted that the inverted V-shaped arc guiding piece 7 can be replaced by the Y-shaped potential equalizing arc guiding piece 10 in Figure 2 .

[0026] As shown in Figure 4 , the circuit breaker is in the open state: high-temperature arc is generated at the moment of opening, and the arc is introduced into the left arc-extinguishing chamber 101 and the right arc-extinguishing chamber 102 on the left and right sides according to the direction of the arrow under the action of the inverted V-shaped arc guiding piece 7, and is extinguished by the left arc-extinguishing grid 103 and the right arc-extinguishing grid 104. The main function of the inverted V-shaped arc guiding piece 7 is to connect the left arc-extinguishing chamber 101 and the right arc-extinguishing chamber 102 on the left and right sides in series to participate in arc extinguishing together, as shown in Figure 7 , and the notch of the structure is mainly to provide a certain space for the thermal tripping system 2.

[0027] As shown in Figure 5 , the circuit breaker is in the closed state: the current passes through the incoming terminal 5, the coil of the magnetic tripping system 4, the static contact conducting piece 11, the static contact, the moving contact, the wire one 15, the thermal double gold piece 12, the wire two 16, the right arc guiding piece 9, and the outgoing terminal 6.

[0028] When the overload current flows through the thermal double gold piece 12, the thermal double gold piece 12 moves the tripping rod 13 to the right side by deformation, so that the tripping rod 13 touches the tripping piece 14 to realize the tripping of the mechanism, and then realizes the opening function of the circuit breaker.

[0029] Among them, the wire one 15 connects the moving contact and the upper end of the thermal double gold piece 12, and the wire two 16 connects the thermal double gold piece 12 and the right arc guiding piece 9. When the circuit breaker is closed, the current flow path is as shown in Figure 5 , wherein the thermal double gold piece 12 contained therein is the main execution piece of the thermal tripping function.

[0030] As shown in Figure 6As shown, the main role of the insulation isolation plate 8 is to isolate the thermal trip system 2 from the arc area on the back side and the left and right arc chambers 102 on the left and right sides, to avoid the thermal trip system 2 from being disturbed by arc burning and creeping.

[0031] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical scheme of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical scheme of the present application, by using the disclosed methods and technical contents. Therefore, any equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. Arrangement of a miniature circuit breaker, characterized in that The arc extinguishing device comprises a shell, arc extinguishing areas are symmetrically arranged at left and right positions of a lower part of an inner cavity of the shell, an arc running area and a thermal tripping area are arranged at a middle position of the lower part of the inner cavity of the shell, the arc running area and the thermal tripping area are arranged in an overlapping manner, the arc extinguishing areas at the left and right positions are communicated through the arc running area at the middle position, and an insulating isolation plate is arranged between the thermal tripping area and the arc extinguishing areas at the left and right positions and the arc running area.

2. The arrangement of a miniature circuit breaker according to claim 1, characterized in that An operating mechanism area is arranged at a middle position of an upper part of the inner cavity of the shell.

3. The miniature circuit breaker arrangement of claim 1, wherein A magnetic tripping area is arranged at a left position of the upper part of the inner cavity of the shell.

4. The miniature circuit breaker arrangement of claim 1, wherein, An incoming line area and an outgoing line area are arranged at left and right ends of the shell.

5. The miniature circuit breaker arrangement of claim 1, wherein, An inverted V-shaped arc striking piece is arranged in the arc running area.

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