Fixed circuit breaker

Abstract

The fixed circuit breaker comprises a base and a bottom plate, the base and the bottom plate form a containing space with an opening in the upper portion, an arc extinguish chamber is arranged in the containing space, and a secondary terminal is arranged on the side, close to an installation operating mechanism, of the arc extinguish chamber. The secondary terminal is fixedly mounted on the bottom plate through a mounting plate, and the insulating partition plate is positioned between the arc extinguish chamber and the mounting plate and is used for partitioning hot air flow when short-circuit current is broken. Compared with the prior art, the fixed circuit breaker has the advantages that hot air flow during short-circuit current breaking can be isolated through the arranged insulating partition plate, so that the bad influence of insulation breakdown on surrounding conductors, particularly conductors near the secondary terminal, is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a fixed circuit breaker. Background Art

[0002] Universal circuit breakers are mainly used in low-voltage power distribution lines for overload, short circuit, undervoltage and other protection. They can also be used for infrequent connection and disconnection of circuits and are widely used. According to the installation method, they are divided into fixed type and drawer type. Compared with the drawer type, the fixed type does not have a drawer frame structure and is relatively cheap.

[0003] The existing technology is that one side of the top cover of the product is directly connected to the secondary terminal, and there is no insulating plate between the top of the arc extinguishing chamber and the secondary terminal. Under this structural design, the fixing strength of the front end of the cover is general, and the insulation performance between the top of the arc extinguishing chamber and the secondary terminal is general, which is only applicable to power systems of AC690V and below. When used in AC1000V / DC1500V and above power systems, due to the very high arc energy generated by the short-circuit current being broken, the gas in the arc extinguishing chamber expands due to heat and has a very large impact on the outside; in addition, the temperature of the ejected gas is very high and mixed with a certain amount of charged metal particles, which will reduce the insulation performance of objects in the airflow movement path. If the existing technology is used, when breaking the short-circuit current, there will be structural damage at the connection between the top cover and the secondary terminal, or insulation breakdown will occur between the phase-to-phase arc and the secondary terminal fixing plate, resulting in a phase-to-phase short circuit problem.

[0004] Therefore, the utility model needs to provide a fixed circuit breaker with a simple structure and capable of avoiding the problem of insulation breakdown inside the product. Utility Model Content

[0005] The purpose of the utility model is to provide a fixed circuit breaker, so as to solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A fixed circuit breaker comprises a base and a bottom plate, wherein the base and the bottom plate form a receiving space with an opening at the top, wherein an arc extinguishing chamber is arranged in the receiving space, and a secondary terminal is arranged on a side of the arc extinguishing chamber close to an installation operating mechanism, wherein the secondary terminal is fixedly mounted on the bottom plate through a mounting plate.

[0008] It also includes an insulating partition, which is located between the arc extinguishing chamber and the mounting plate, and is used to isolate the hot air flow when breaking the short-circuit current.

[0009] Furthermore, the lower portion of the insulating partition is fixedly mounted on the bottom plate, and the upper portion of the insulating partition is higher than the height of the arc extinguishing chamber.

[0010] Furthermore, the mounting plate is composed of a first vertical plate, a first horizontal plate and a second vertical plate, the lower end of the first vertical plate is fixedly mounted on one side of the first horizontal plate, and the first vertical plate extends upward to a side away from the first horizontal plate, and the upper end of the second vertical plate is fixedly mounted on the other side of the first horizontal plate, and the second vertical plate extends downward to a side away from the first horizontal plate.

[0011] Furthermore, the first vertical plate, the first horizontal plate and the second vertical plate are formed by integral molding or welding.

[0012] Furthermore, an air flow channel is formed between the insulating partition and the first vertical plate.

[0013] Furthermore, a cover plate is provided on the top of the arc extinguishing chamber.

[0014] Furthermore, the cover plate is a metal cover plate, and the cover plate is fixed to the upper end of the arc extinguishing chamber by fixing screws.

[0015] Furthermore, it also includes a metal shell, the metal shell cover is limited at the top of the arc extinguishing chamber and on both sides of the metal shell cover by limiting grooves set on the bottom plate, and the side of the metal shell close to the secondary terminal is fixed to the mounting plate by fixing screws.

[0016] Furthermore, the metal shell also includes an insulating lining, which is arranged on the top inner surface of the metal shell.

[0017] Furthermore, a plurality of heat dissipation holes are provided on both sides of the metal shell, and the plurality of heat dissipation holes are sequentially arranged on both sides of the metal shell.

[0018] The beneficial effects of the utility model are:

[0019] In the utility model, an insulating partition is arranged between the arc extinguishing chamber and the mounting plate, and the insulating partition can block and interrupt the hot air flow during the short-circuit current, thereby avoiding the adverse effect of insulation breakdown on surrounding conductors, especially conductors near secondary terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the fixed circuit breaker of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the fixed circuit breaker of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the fixed circuit breaker of the utility model;

[0023] Figure 4 It is a cross-sectional view of the fixed circuit breaker of the utility model.

[0024] Reference numerals:

[0025] Base 1, bottom plate 2, arc extinguishing chamber 3, secondary terminal 4, mounting plate 5, insulation partition 6, cover plate 7, metal shell 8, insulating lining plate 9, operating mechanism 10, heat dissipation hole 11;

[0026] A first vertical plate 51 , a first horizontal plate 52 , and a second vertical plate 53 . DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0028] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0031] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0032] like Figures 1 to 4As shown, a fixed circuit breaker includes a base 1 and a bottom plate 2, wherein the base 1 and the bottom plate 2 form a receiving space with an opening at the top, wherein an arc extinguishing chamber 3 is provided in the receiving space, wherein a secondary terminal 4 is provided on a side of the arc extinguishing chamber 3 close to an installation operating mechanism 10, wherein the secondary terminal 4 is fixedly installed on the bottom plate 2 through a mounting plate 5,

[0033] It also includes an insulating partition 6, which is located between the arc extinguishing chamber 3 and the mounting plate 5, and is used to block the hot air flow when breaking the short-circuit current.

[0034] From the above method, it can be known that since the insulating partition 6 is set between the arc extinguishing chamber 3 and the mounting plate 5, the insulating partition 6 can block and interrupt the hot air flow during the short-circuit current, thereby avoiding the adverse effects of insulation breakdown on the surrounding conductors, especially the conductors near the secondary terminals.

[0035] In this embodiment, in order to firmly fix the insulating partition 6 on the bottom plate 2, the lower part of the insulating partition 6 is fixedly mounted on the bottom plate 2 by screws, thereby ensuring that the insulating partition 6 can be firmly fixed on the bottom plate 2 to prevent the insulating partition 6 from falling off when the product is subjected to external force or vibration;

[0036] The upper part of the insulating partition 6 is higher than the height of the arc extinguishing chamber 3, and the upper end of the insulating partition 6 is flush with the upper end of the secondary terminal 4. Since the height of the insulating partition 6 is higher than the height of the arc extinguishing chamber 3, it can effectively block and disconnect the hot air flow generated when the short-circuit current is interrupted, thereby preventing the surrounding conductors from being insulated and punctured.

[0037] Specifically, the mounting plate 5 is composed of a first vertical plate 51, a first horizontal plate 52 and a second vertical plate 53. The lower end of the first vertical plate 51 is fixedly mounted on one side of the first horizontal plate 52, and the first vertical plate 51 extends upward to a side away from the first horizontal plate 52. The upper end of the second vertical plate 53 is fixedly mounted on the other side of the first horizontal plate 52, and the second vertical plate 53 extends downward to a side away from the first horizontal plate 52. The secondary terminal 4 is fixedly mounted on the first vertical plate 51, and the secondary terminal 4 is fixed to the first vertical plate 51 by fixing bolts, and the second vertical plate 53 is fixed to the insulating partition 6 by fixing bolts.

[0038] In addition, it should be noted that the first vertical plate 51, the first horizontal plate 52 and the second vertical plate 53 are formed by integral molding or welding. In the present embodiment, the first vertical plate 51, the first horizontal plate 52 and the second vertical plate 53 are connected by integral molding. In the actual production process, the first vertical plate 51, the first horizontal plate 52 and the second vertical plate 53 can also be connected by welding.

[0039] In addition, it should be noted that an airflow channel is formed between the insulating partition 6 and the first vertical plate 51, and the airflow channel is used to buffer the hot airflow generated when the short-circuit current is disconnected to avoid the airflow impact from penetrating the conductor.

[0040] In addition, it should be noted that a cover plate 7 is provided on the top of the arc extinguishing chamber 3. In the present embodiment, the cover plate is a metal cover plate, and the cover plate 7 is fixed to the upper end of the arc extinguishing chamber 3 by fixing screws. Since the metal cover plate is fixed by the chamber screws, it can be ensured that the cover plate 7 is firmly fixed to the upper end of the arc extinguishing chamber.

[0041] In addition, it is worth noting that it also includes a metal shell 8, which covers the top of the arc extinguishing chamber 3, and the two sides of the metal shell 8 are limited by limiting grooves arranged on the bottom plate, and the side of the metal shell 8 close to the secondary terminal 4 is fixed to the mounting plate 5 by fixing screws. The set metal shell 8 can withstand the strong airflow impact when disconnecting the short-circuit current without causing structural damage.

[0042] Furthermore, the metal shell 8 also includes an insulating lining 9, which is arranged on the top inner surface of the metal shell. At the same time, the insulating lining can block and cut off the hot air flow during short-circuit current, thereby avoiding the adverse effects of insulation breakdown on surrounding conductors, especially conductors near secondary terminals.

[0043] In addition, it is worth noting that a plurality of heat dissipation holes 11 are provided on both sides of the metal shell 8. The plurality of heat dissipation holes are sequentially arranged on both sides of the metal shell. The heat dissipation holes can effectively dissipate heat for the circuit breaker, thereby extending its service life.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A fixed circuit breaker, characterized in that: The invention comprises a base and a bottom plate, wherein the base and the bottom plate form a receiving space with an opening at the top, wherein an arc extinguishing chamber is arranged in the receiving space, and a secondary terminal is arranged on a side of the arc extinguishing chamber close to the installation operating mechanism, and the secondary terminal is fixedly mounted on the bottom plate through a mounting plate. It also includes an insulating partition, which is located between the arc extinguishing chamber and the mounting plate, and is used to isolate the hot air flow when breaking the short-circuit current.

2. The fixed circuit breaker according to claim 1, characterized in that The lower part of the insulating partition is fixedly mounted on the bottom plate, and the upper part of the insulating partition is higher than the height of the arc extinguishing chamber.

3. The fixed circuit breaker according to claim 1, characterized in that: The mounting plate consists of a first vertical plate, a first horizontal plate and a second vertical plate, the lower end of the first vertical plate is fixedly mounted on one side of the first horizontal plate, and the first vertical plate extends upward to a side away from the first horizontal plate, the upper end of the second vertical plate is fixedly mounted on the other side of the first horizontal plate, and the second vertical plate extends downward to a side away from the first horizontal plate.

4. The fixed circuit breaker according to claim 3, characterized in that: The first vertical plate, the first horizontal plate and the second vertical plate are formed in one piece or by welding.

5. The fixed circuit breaker according to claim 4, characterized in that: An air flow channel is formed between the insulating partition and the first vertical plate.

6. The fixed circuit breaker according to claim 1, characterized in that: A cover plate is provided on the top of the arc extinguishing chamber.

7. The fixed circuit breaker according to claim 6, characterized in that: The cover plate is a metal cover plate, and the cover plate is fixed to the upper end of the arc extinguishing chamber by fixing screws.

8. The fixed circuit breaker according to claim 1, characterized in that: It also includes a metal shell, which is limited at the top of the arc extinguishing chamber and on both sides of the metal shell by limiting grooves arranged on the bottom plate, and the side of the metal shell close to the secondary terminal is fixed to the mounting plate by fixing screws.

9. The fixed circuit breaker according to claim 8, characterized in that: The metal shell further includes an insulating liner disposed on a top inner surface of the metal shell.

10. The fixed circuit breaker according to claim 9, characterized in that: A plurality of heat dissipation holes are also provided on both sides of the metal shell, and the plurality of heat dissipation holes are sequentially arranged on both sides of the metal shell.

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