Arc striking structure of double-contact circuit breaker
By setting a bent conductive part on the conductive copper row of the double-contact circuit breaker, the excitation magnetic field component is generated, which solves the problem of arcing time in the arc extinguishing room for a long time and improves the breaking performance of the circuit breaker.
Patent Information
- Application Number
- CN202421372408.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-14
AI Technical Summary
When the existing dual-contact circuit breaker breaks the circuit, the arc is insufficiently driven into the arc extinguishing chamber, resulting in a long arc burning time, poor arc extinguishing performance, and low electrical life and breaking performance of the product.
An arc-induced arc structure of a double-contact circuit breaker is designed. By providing a bent conductive portion on the conductive copper row, when the current flows through the bent conductive portion, an excitation magnetic field component perpendicular to the plane where the moving contact and the static contact are located is generated at the closing of the moving contact and the static contact, so that the arc is blown into the arc extinguishing chamber by magnetically.
By transferring the arc to the arc running track, the breaking performance of the circuit breaker is improved.
Smart Images
Figure CN222762908U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an arc striking structure of a double-contact circuit breaker. Background Art
[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breakers are also called automatic switches, commonly known as "air switches" and also refer to low-voltage circuit breakers. They are electrical appliances that have both the function of manual switches and can automatically perform loss of voltage, undervoltage, overload, and short-circuit protection. It can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overloads or short circuits and undervoltage faults, they can automatically cut off the circuit. Its function is equivalent to the combination of fuse switches and over-underheating relays, and generally no parts need to be changed after breaking the fault current. It has been widely used. With the continuous increase in power grid capacity and the need for centralized power distribution, electrical appliances require higher and higher breaking capacity, so current limiting contact structures have been widely used in molded case circuit breakers, especially circuit breakers with double breakpoint structures. 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, when the existing double-contact circuit breaker breaks the circuit, the arc is not sufficiently pushed into the arc extinguishing chamber by the magnetic force, resulting in a long arc burning time, poor arc extinguishing performance, and low electrical life and breaking performance of the product. Utility Model Content
[0003] The utility model aims to solve the problem that when the above-mentioned existing double-contact circuit breaker disconnects the circuit, the arc is pushed into the arc extinguishing chamber by insufficient magnetic force, and provides an arc striking structure for a double-contact circuit breaker, in which the conductive copper busbar loop is bent outward. When the current flows through the bent loop, an excitation magnetic field component perpendicular to the plane where the moving contact and the static contact are located is generated at the closing point of the moving contact and the static contact. During the breaking process, the arc is transferred to the arc runway, accelerated to enter the arc extinguishing chamber, and the breaking performance is improved.
[0004] Technical Solution
[0005] In order to achieve the above technical objectives, the utility model provides an arc-striking structure for a double-contact circuit breaker, which includes a moving contact, a terminal block, a bimetallic strip and a conductive copper bar, wherein one end of the conductive copper bar is connected to one end of a flexible connection, and the other end is connected to a contact portion of a stationary contact, and is characterized in that a bent conductive portion is provided on the conductive copper bar, and when a variable current flows through the bent conductive portion, an excitation magnetic field component perpendicular to the plane where the moving contact and the stationary contact are located can be generated at the closing position of the moving contact and the stationary contact, so that the arc generated by the disconnection of the moving contact and the stationary contact is magnetically blown into the arc extinguishing chamber.
[0006] Preferably, the conductive copper bus is L-shaped.
[0007] In one embodiment, a section of the conductive copper busbar corresponding to the flexible connection 1 includes a first horizontal section, a bent conductive portion and a second horizontal section, the second horizontal section corresponds to the bimetallic strip, and the height of the second horizontal section is lower than that of the first horizontal section.
[0008] In one of the embodiments, the bent conductive portion is perpendicular to the moving contact in a closed state.
[0009] In one of the embodiments, one end of the conductive copper bar is welded to one end of the flexible connector, and the other end is welded to the contact portion of the stationary contact.
[0010] In one embodiment, one end of the flexible connector is connected to one end of the conductive copper busbar, and the other end is connected to a wiring board.
[0011] In one of the embodiments, a conductive copper bar section extends out from the side of one end of the conductive copper bar connected to the contact portion 601 of the stationary contact.
[0012] In one of the embodiments, the conductive copper bar segment extends from the conductive copper bar and is connected to the second flexible connection.
[0013] In one embodiment, one end of the flexible connector is connected to the conductive copper busbar segment, and the other end is connected to the bimetallic strip.
[0014] Beneficial Effects
[0015] The utility model provides an arc-starting structure of a double-contact circuit breaker, which includes a moving contact, a terminal board 2, a bimetallic sheet and a conductive copper bar, one end of the conductive copper bar is connected to one end of a soft connection, and the other end is connected to the contact part of a stationary contact, and a bent conductive part is arranged on the conductive copper bar. When a variable current flows through the bent conductive part, an excitation magnetic field component perpendicular to the plane where the moving contact and the stationary contact are located can be generated at the closing position of the moving contact and the stationary contact, so that the arc generated by the breaking of the moving contact and the stationary contact is magnetically blown into the arc extinguishing chamber. During the breaking process, the arc is transferred to the arc runway, accelerated to enter the arc extinguishing chamber, and the breaking performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0017] Attached Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model Figure 1;
[0018] Attached Figure 2 This is a schematic diagram of the structure of the first embodiment of the utility model Figure 2 ;
[0019] Attached Figure 3 This is a product diagram of a conductive copper busbar in Embodiment 1 of the present utility model;
[0020] Attached Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;
[0021] Attached Figure 5 This is a product diagram of a conductive copper busbar in Embodiment 2 of the present utility model; DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0025] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art 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 related listed items.
[0027] Example 1
[0028] As attached Figure 1 ,2 shows an arc-starting structure of a double-contact circuit breaker, which includes a moving contact 1, a terminal block 2, a bimetallic strip 3 and a conductive copper bar 4, one end of the conductive copper bar 4 is connected to one end of a flexible connection 5, and the other end is connected to a contact portion 601 of a stationary contact 6, one end of the flexible connection 5 is connected to one end of the conductive copper bar 4, and the other end is connected to the terminal block 2. The conductive copper bar 4 is provided with a bent conductive portion 401, and when a variable current flows through the bent conductive portion 401, an excitation magnetic field component perpendicular to the plane where the moving contact 1 and the stationary contact 6 are located can be generated at the closed position of the moving contact 1 and the stationary contact 6, so that the arc generated by the disconnection of the moving contact 1 and the stationary contact 6 is magnetically blown into the arc extinguishing chamber. In this embodiment, the conductive copper bar 4 is L-shaped. One end of the conductive copper bar 4 is welded to one end of a flexible connection 5, and the other end is welded to the contact portion 601 of the stationary contact 6.
[0029] In order to make the excitation magnetic field component perpendicular to the plane where the moving contact 1 and the stationary contact 6 are located larger, as shown in the attached Figure 1 and 3 As shown, the section of the conductive copper bar 4 corresponding to the flexible connection 5 includes a first horizontal section 402, a bent conductive portion 401 and a second horizontal section 403. The second horizontal section 403 corresponds to the bimetallic strip 3. The height of the second horizontal section 403 is lower than that of the first horizontal section 402. In this way, the current path is close to the moving and static contact points and the arc running area, which is more conducive to the arc being magnetically blown into the arc extinguishing chamber. The bent conductive portion 401 is perpendicular to the moving contact 1 in the closed state.
[0030] Example 2
[0031] As attached Figure 4 and 5 As shown, a conductive copper bar segment 404 extends out from the side of one end of the conductive copper bar 4 connected to the contact portion 601 of the static contact 6. The conductive copper bar segment 404 extends out from the conductive copper bar 4 and is connected to the soft connection 2 7. One end of the soft connection 2 7 is connected to the conductive copper bar segment 404, and the other end is connected to the bimetallic strip 3. Specifically, the upper end of the soft connection 2 7 is connected to the conductive copper bar segment 404, and the other end is connected to the lower end side of the bimetallic strip 3. One end of the soft connection 3 8 is connected to the terminal block 2, and the other end is connected to the upper end side of the bimetallic strip 3. Such a structure further increases the conductive cross-sectional area, reduces the temperature rise, and at the same time strengthens the magnetic blowing force in the arc running area, which is conducive to the arc being magnetically blown into the arc extinguishing chamber. Other structures and principles are the same as those in Example 1.
[0032] The utility model provides an arc striking structure for a double-contact circuit breaker, which enables the electric arc to transfer to an arc runway during the breaking process, accelerates the arc into an arc extinguishing chamber, and improves the breaking performance.
[0033] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0034] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. An arc-starting structure for a double-contact circuit breaker, comprising a moving contact (1), a terminal block (2), a bimetallic strip (3) and a conductive copper bar (4), wherein one end of the conductive copper bar (4) is connected to one end of a flexible connection (5), and the other end is connected to a contact portion (601) of a stationary contact (6), characterized in that: The conductive copper busbar (4) is provided with a bent conductive portion (401), and when a variable current flows through the bent conductive portion (401), an excitation magnetic field component perpendicular to the plane where the moving contact (1) and the stationary contact (6) are located can be generated at the closed position of the moving contact (1) and the stationary contact (6), so that the arc generated by the disconnection of the moving contact (1) and the stationary contact (6) is magnetically blown into the arc extinguishing chamber.
2. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: The conductive copper busbar (4) is L-shaped.
3. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: A section of the conductive copper busbar (4) corresponding to the flexible connection 1 (5) comprises a first horizontal section (402), a bent conductive portion (401) and a second horizontal section (403), wherein the second horizontal section (403) corresponds to the bimetallic strip (3), and the height of the second horizontal section (403) is lower than that of the first horizontal section (402).
4. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: The bent conductive portion (401) is perpendicular to the moving contact (1) when in a closed state.
5. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: One end of the conductive copper bar (4) is welded to one end of the flexible connection (5), and the other end is welded to the contact part (601) of the stationary contact (6).
6. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: One end of the flexible connection (5) is connected to one end of the conductive copper bus (4), and the other end is connected to the wiring board (2).
7. The arc striking structure of a double-contact circuit breaker according to claim 1, characterized in that: A conductive copper bar section (404) extends out from the side of one end of the conductive copper bar (4) connected to the contact portion (601) of the stationary contact (6).
8. The arc striking structure of a double-contact circuit breaker according to claim 7, characterized in that: The conductive copper bar segment (404) extends from the conductive copper bar (4) and is connected to the second flexible connection (7).
9. The arc striking structure of a double-contact circuit breaker according to claim 8, characterized in that: One end of the second flexible connection (7) is connected to the conductive copper bar segment (404), and the other end is connected to the bimetallic strip (3).