Circuit breaker structure capable of increasing magnetic blow-out force

Abstract

A circuit breaker structure capable of increasing magnetic blow-out force comprises a wire inlet plate, a bimetallic strip, a static contact plate and a moving contact, and is characterized in that corresponding parts among the wire inlet plate, the bimetallic strip, the static contact plate and the moving contact are correspondingly connected through flexible connection, so that current entering through the wire inlet plate is shunted, and the wire inlet plate, the bimetallic strip, the static contact plate and the moving contact are connected through flexible connection. Current in the same direction flows between corresponding parts between the static contact plate and the moving contact. By replacing the connection position of the soft connector, the current direction of the bimetallic strip and the soft connector is the same as the current direction of one end of the moving contact, the magnetic blow-out force in the product is enhanced, and in the breaking process, the arc is accelerated to enter the arc extinguish chamber, so that the arc is quickly extinguished, and the breaking performance of the product is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit breakers, and specifically relates to a circuit breaker structure for increasing magnetic blowing force. Background Art

[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their application scope. Low-voltage circuit breakers, also known as automatic switches, commonly known as "air switches", also refer to low-voltage circuit breakers. It is an electrical appliance that has the function of a manual switch and can automatically perform undervoltage, overvoltage, overload, and short-circuit protection. It can be used to distribute electric energy, start asynchronous motors infrequently, and protect power supply lines and motors, etc. When they have serious overload, short-circuit, and undervoltage faults, it can automatically cut off the circuit. Its function is equivalent to the combination of a fuse switch and an over- and under-heat relay, etc., and generally does not require changing components after breaking the fault current, and has been widely used. With the continuous increase of the power grid capacity and the need for centralized power distribution, the circuit breaker is required to have a higher breaking capacity. Therefore, the current-limiting contact structure has been widely used in molded case circuit breakers. Especially for circuit breakers with a double-break structure, since the arc energy is borne by two contacts, the breaking capacity is further improved, and it has been more widely developed in recent years; however, in the current loop formed by the incoming line board, bimetallic strip, static contact board and moving contact of the existing double-contact circuit breaker, the magnetic fields generated are prone to weaken each other, and the effect of enhancing the magnetic blowing force cannot be achieved. The arc cannot be effectively blown into the arc extinguishing chamber by magnetic blowing, reducing the breaking performance of the circuit breaker. Content of the Utility Model

[0003] The purpose of the present utility model is to solve the problem that the magnetic fields generated in the current loop are prone to weaken each other when the existing double-contact circuit breaker breaks the circuit. A circuit breaker structure for increasing magnetic blowing force is provided. While shunting the current entering through the incoming line board, the current directions in the corresponding components of the incoming line board, bimetallic strip, static contact and moving contact are made the same to increase the magnetic field force, thereby improving the breaking performance of the circuit breaker.

[0004] Technical Solution

[0005] To achieve the above technical purpose, the present utility model provides a circuit breaker structure for increasing magnetic blowing force, which includes an incoming line board, a bimetallic strip, a static contact board and a moving contact. It is characterized in that: the corresponding components between the incoming line board, bimetallic strip, static contact board and moving contact are connected correspondingly through a flexible connection, so that while shunting the current entering through the incoming line board, the current flowing between the corresponding components of the incoming line board, bimetallic strip, static contact board and moving contact is in the same direction.

[0006] In one of the embodiments, the current flowing direction of the second moving contact part in the moving contact is the same as the current direction of the bimetallic strip.

[0007] In one embodiment, one end of the first flexible connection is connected to the incoming line board, and the other end is connected to the upper end of the bimetal sheet located within the vertical projection of the bimetal sheet.

[0008] One end of the second flexible connection is connected to the lower side of the static contact plate, and the other end is connected to the lower end of the bimetal sheet located within the vertical projection of the bimetal sheet.

[0009] In one embodiment, one end of the third flexible connection is connected to the incoming line board, and the other end is connected to the lower side of the static contact plate.

[0010] In one embodiment, one end of the first flexible connection is welded to the incoming line board, and the other end is welded to the upper end of the bimetal sheet located within the vertical projection of the bimetal sheet. One end of the second flexible connection is welded to the lower side of the static contact plate, and the other end is welded to the lower end of the bimetal sheet located within the vertical projection of the bimetal sheet.

[0011] Furthermore, the bimetal sheet and the moving contact are arranged at the same angular direction.

[0012] Furthermore, the first moving contact part and the second moving contact head in the moving contact are arranged at the same angular direction.

[0013] Furthermore, the third flexible connection is arranged at the same angular direction as the first moving contact part.

[0014] Beneficial Effects

[0015] The present utility model provides a circuit breaker structure for increasing magnetic blow force, which includes an incoming line board, a bimetal sheet, a static contact plate and a moving contact. Corresponding components between the incoming line board, the bimetal sheet, the static contact plate and the moving contact are connected correspondingly through flexible connections. Thus, while the current entering through the incoming line board is shunted, the current flowing between the corresponding components of the incoming line board, the bimetal sheet, the static contact plate and the moving contact is in the same direction. By changing the connection position of the flexible connection, the current direction of the bimetal sheet and the flexible connection is the same as the current direction at one end of the moving contact, and the magnetic blow force inside the product is enhanced. During the opening process, the arc is accelerated into the arc extinguishing chamber, thereby quickly extinguishing the arc and improving the breaking performance of the product. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Att Figure 1Schematic diagram of the structure of an embodiment of the present invention Figure 1 ;

[0018] Appendix Figure 2 Schematic diagram of the structure of an embodiment of the present invention Figure 2 ;

[0019] Appendix Figure 3 Schematic installation diagram of the structure of an embodiment of the present invention; Detailed implementation manners

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0025] Embodiment

[0026] A circuit breaker structure for increasing magnetic blow force, which includes an incoming line board 1, a bimetal sheet 2, a static contact board 3 and a moving contact 4. The corresponding components between the incoming line board 1, the bimetal sheet 2, the static contact board 3 and the moving contact 4 are connected correspondingly through flexible connections. While the current entering through the incoming line board 1 is shunted, the current flowing between the corresponding components of the incoming line board 1, the bimetal sheet 2, the static contact board 3 and the moving contact 4 has the same direction.

[0027] Specifically, as shown in FIGS. Figure 1 , 2, and 3, the contact portion of the static contact board 3 is the upper side 302 of the static contact board 3, and the side away from the contact portion is the lower side 301 of the static contact board 3; one end of the flexible connection 5 is connected to the incoming line board 1, and the other end is connected to the upper end of the bimetal sheet 2 located in the vertical projection of the bimetal sheet 2; one end of the flexible connection 6 is connected to the lower side 301 of the static contact board 3, and the other end is connected to the lower end of the bimetal sheet 2 located in the vertical projection of the bimetal sheet 2. One end of the flexible connection 7 is connected to the incoming line board 1, and the other end is connected to the lower side 301 of the static contact board 3. In this embodiment, further, one end of the flexible connection 5 is welded to the incoming line board 1, and the other end is welded to the upper end of the bimetal sheet 2 located in the vertical projection of the bimetal sheet 2. One end of the flexible connection 6 is welded to the lower side 301 of the static contact board 3, and the other end is welded to the lower end of the bimetal sheet 2 located in the vertical projection of the bimetal sheet 2. After the current flows into from the incoming line board 1, it is divided into two parts. One part of the current directly enters the lower side of the static contact board through the flexible connection 7. After the product is closed, the current first flows through the first moving contact part 401 and then reaches the second moving contact head 402. At this time, the current flow direction of the second moving contact head 402 is from top to bottom; the other part of the current flows through the upper end of the bimetal sheet 2 through the flexible connection 5, flows from the upper end of the bimetal sheet 2 to the lower end and then flows into the lower side of the static contact board through the flexible connection 6. After the product is closed, the current first flows through the first moving contact part 401 and then reaches the second moving contact head 402. At this time, the current flow direction of the second moving contact head 402 is from top to bottom. At this time, the current flow direction of the second moving contact head 402 is the same as the current direction of the bimetal sheet 2, and the generated magnetic field is larger, and the magnetic blow force inside the product is enhanced, the arc accelerates into the arc extinguishing chamber, so as to quickly extinguish the arc and improve the breaking performance of the product;

[0028] To ensure that the current directions are the same as much as possible, the bimetallic strip 2 and the moving contact 4 are arranged at the same angular direction. The first moving contact part 401 and the second moving contact head part 402 in the moving contact 4 are arranged at the same angular direction. The flexible connection three 7 is arranged at the same angular direction as the first moving contact part 401.

[0029] The utility model provides a circuit breaker structure for increasing magnetic blow force. By changing the connection position of the flexible connection, the current directions of the bimetallic strip and the flexible connection are the same as the current direction at one end of the moving contact, and the magnetic blow force inside the product is enhanced. During the opening process, the arc is accelerated into the arc extinguishing chamber, so as to quickly extinguish the arc and improve the breaking performance of the product.

[0030] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0031] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A circuit breaker structure for increasing magnetic blowing force, comprising an inlet plate (1), a bimetallic strip (2), a stationary contact plate (3) and a moving contact (4), characterized in that: The corresponding components among the line-in board (1), the bimetallic strip (2), the stationary contact plate (3) and the moving contact (4) are connected accordingly via a flexible connection, so that the current entering through the line-in board (1) is divided while currents in the same direction flow between the corresponding components among the line-in board (1), the bimetallic strip (2), the stationary contact plate (3) and the moving contact (4).

2. A circuit breaker structure for increasing magnetic blow force as claimed in claim 1, characterized in that: The current flow direction of the second moving contact part (402) in the moving contact (4) is the same as the current direction of the bimetallic strip (2).

3. A circuit breaker structure for increasing magnetic blow force as claimed in claim 2, characterized in that: One end of the flexible connection (5) is connected to the line inlet board (1), and the other end is connected to the bimetallic strip (2) and is located at the upper end of the bimetallic strip (2) in the vertical direction projection; One end of the second soft connection (6) is connected to the lower side (301) of the stationary touch plate (3), and the other end is connected to the bimetallic strip (2) and is located at the lower end of the bimetallic strip (2) in the vertical projection.

4. A circuit breaker structure for increasing magnetic blow force as claimed in claim 3, characterized in that: One end of the flexible connection three (7) is connected to the line inlet board (1), and the other end is connected to the lower side (301) of the stationary contact board (3).

5. A circuit breaker structure for increasing magnetic blow force as claimed in claim 3, characterized in that: One end of the flexible connection 1 (5) is welded to the incoming line board (1), and the other end is welded to the bimetallic strip (2) and is located at the upper end of the vertical projection of the bimetallic strip (2); one end of the flexible connection 2 (6) is welded to the lower side (301) of the stationary contact plate (3), and the other end is welded to the bimetallic strip (2) and is located at the lower end of the vertical projection of the bimetallic strip (2).

6. A circuit breaker structure for increasing magnetic blow force as claimed in claim 1 or 2, characterized in that: The bimetallic strip (2) and the moving contact (4) are arranged at the same direction and angle.

7. A circuit breaker structure for increasing magnetic blow force as claimed in claim 1 or 2, characterized in that: The moving contact part 1 (401) and the moving contact part 2 (402) in the moving contact (4) are arranged at the same direction and angle.

8. A circuit breaker structure for increasing magnetic blow force as claimed in claim 1 or 2, characterized in that: The flexible connection 3 (7) and the moving contact part 1 (401) are arranged at the same direction and angle.

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