Contact system and circuit breaker

Abstract

The utility model discloses a contact system and a circuit breaker, the contact system comprises a static contact, a moving contact and an arc extinguish chamber, the static contact and the moving contact are connected through a connecting plate, and the arc extinguish chamber is located at the upper part of the static contact; the circuit breaker further comprises a radiator, the radiator is located at the joint of the static contact and the connecting plate, the radiator is used for reducing the temperature in the circuit breaker, and the radiator is fixed at the joint of the static contact and the connecting plate through a fixing piece. Compared with the prior art, the circuit breaker is simple in structure, can rapidly dissipate heat, further reduces the temperature rise, improves the stability of a product, and prolongs the service life of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a contact system. Background Art

[0002] .The molded case circuit breaker is a switch device that can carry and break the current under normal circuit conditions, and can also carry and break the current under abnormal circuit conditions within a specified time. With the development of new energy technologies, such as photovoltaics, wind power, and energy storage, the AC system voltage has reached AC1500V, and the DC system voltage has reached DC1500V. As the system voltage continues to increase, the rated working voltage of the supporting components also needs to meet the system voltage requirements. However, with the increase in working voltage, higher requirements are placed on the insulation of circuit breakers. While the country is vigorously promoting the new energy industry, the requirements for low energy consumption are also getting higher and higher.

[0003] At present, the internal pole connection wiring method is widely used in the market, that is, the two poles are connected by a connecting plate. It is fixed by spot welding, screw tightening or riveting. However, this connection method will still cause more breakpoints, increase the contact breakpoint circuit resistance, and then increase the temperature rise, making the circuit breaker overload working characteristics unstable, prone to premature operation, and shortening the product life.

[0004] Therefore, the utility model needs to provide a contact system with a simple structure and capable of rapid heat dissipation to further reduce the temperature rise. Utility Model Content

[0005] The purpose of the utility model is to provide a contact system, 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 contact system, comprising: a stationary contact, a moving contact and an arc extinguishing chamber, wherein the stationary contact and the moving contact are connected via a connecting plate, and the arc extinguishing chamber is located above the stationary contact;

[0008] It also includes a heat sink, which is located at the connection between the static contact and the connection plate, and is used to reduce the temperature inside the circuit breaker. The heat sink is fixed at the connection between the static contact and the connection plate through a fixing member;

[0009] The radiator comprises a bottom plate, and a plurality of grid plates are evenly arranged along the length direction of the bottom plate, and heat dissipation channels are formed between adjacent grid plates.

[0010] Furthermore, one end of the grid sheet close to the bottom plate is connected to the bottom plate, and one end of the grid sheet away from the bottom plate extends toward one end away from the bottom plate.

[0011] Furthermore, the grid sheet is in a rectangular shape.

[0012] Furthermore, the spacing between the heat dissipation channels is 0.2 mm-0.5 mm.

[0013] Furthermore, the base plate is provided with a plurality of mounting holes, and the inner surfaces of the mounting holes are provided with internal threads. The fasteners pass through the mounting holes to fix the base plate to the stationary contact and the connecting plate.

[0014] Furthermore, the bottom plate and the grid are connected by welding or integral molding.

[0015] Furthermore, the bottom plate and the grid are made of aluminum.

[0016] Furthermore, it also includes an arc isolation plate, which is located on the outer side of the heat sink and is used to isolate the heat sink inside the circuit breaker.

[0017] Furthermore, the arc isolation plate is rectangular, and a plurality of heat dissipation holes are evenly opened on the rectangular arc isolation plate.

[0018] Furthermore, the arc isolation plate is made of epoxy board or melamine board.

[0019] The utility model also relates to a circuit breaker, comprising the contact system mentioned above.

[0020] The beneficial effects of the utility model are:

[0021] Since a heat sink is provided at the connection between the static contact and the connecting plate, the internal temperature of the circuit breaker can be quickly cooled through the heat sink, the temperature rise will be further reduced, and the stability and life of the product will be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the contact system of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the radiator of the utility model;

[0024] Reference numerals:

[0025] Static contact 1 , moving contact 2 , arc extinguishing chamber 3 , connecting plate 4 , radiator 5 , bottom plate 51 , mounting hole 511 , grid 52 , heat dissipation channel 53 , arc isolating plate 6 , heat dissipation hole 61 . Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, a contact system is provided, comprising: a stationary contact 1, a moving contact 2 and an arc extinguishing chamber 3, wherein the stationary contact 1 and the moving contact 2 are connected via a connecting plate 4, and both ends of the connecting plate 4 are connected to the stationary contact 1 and the moving contact 2 of one phase by welding or screw fastening, and the arc extinguishing chamber 3 is located at the upper part of the stationary contact 1;

[0032] It also includes a heat sink 5, which is located at the connection between the static contact 1 and the connecting plate 4 and close to one side of the arc extinguishing chamber 3. The heat sink 5 is used to reduce the temperature inside the circuit breaker. The temperature inside the circuit breaker is reduced by the heat sink, thereby ensuring the stability of the overload working characteristics of the circuit breaker, avoiding premature operation, and extending the service life of the product. The heat sink 5 is fixed at the connection between the static contact 1 and the connecting plate 4 by a fixing member. In this embodiment, the fixing member adopts a screw to ensure that the heat sink 5, the static contact 1 and the connecting plate 4 are firmly fixed, ensuring that the circuit breaker structure is more stable;

[0033] The heat sink 5 includes a bottom plate 51 , and a plurality of grid plates 52 are evenly arranged along the length direction of the bottom plate 51 , and heat dissipation channels 53 are formed between adjacent grid plates 52 .

[0034] According to the above implementation, since the heat sink 5 is provided at the connection between the static contact 1 and the connecting plate 4, the inside of the circuit breaker can be quickly cooled by the heat sink 5, and the temperature rise will be further reduced, thereby improving the stability and service life of the product.

[0035] It should be noted that one end of the grid sheet 52 close to the bottom plate 51 is connected to the bottom plate, and one end of the grid sheet away from the bottom plate 51 extends toward the end away from the bottom plate 51. In the present embodiment, the grid sheet 52 and the bottom plate 51 are connected and fixed by integral molding or welding to ensure that the grid sheet 52 and the bottom plate 51 can be tightly connected to each other. In addition, it should be noted that the shape of the grid sheet 52 is a rectangle, but in the actual production process, the shape of the grid sheet can also be other shapes, which are again not limited to one by one.

[0036] In addition, it is worth noting that the spacing between the heat dissipation channels is 0.2mm-0.5mm. In this embodiment, the spacing between the heat dissipation channels is set to 0.3mm. In actual production, the spacing between adjacent grids can also be set to other values ​​according to product structure and actual needs, and the specific values ​​are not limited one by one.

[0037] In order to firmly fix the heat sink 5 at the connection between the static contact 1 and the connecting plate 4, two mounting holes 511 are further provided on the bottom plate 51, and the inner surface of the mounting holes 511 is provided with internal threads. After the fastener passes through the mounting holes 511, the bottom plate 51 is fixed to the static contact 1 and the connecting plate 4. In order to cooperate with the installation of the static contact and the connecting plate, the positions of the corresponding mounting holes are further provided with fixing through holes. In this embodiment, the fastener is a fastening screw. In order to achieve better heat dissipation effect, the bottom plate 51 and the grid 52 are made of aluminum.

[0038] In addition, it is worth noting that it also includes an arc isolation plate 6, which is located on the outer side of the heat sink 5 and is used to isolate the heat sink 5 inside the circuit breaker. The arc isolation plate 6 is set to isolate the heat sink inside the circuit breaker to avoid customer contact.

[0039] In addition, it should be noted that the arc isolation plate 6 is rectangular, and a plurality of heat dissipation holes 61 are evenly opened on the rectangular arc isolation plate 6 , and the arc isolation plate is made of epoxy board or melamine board.

[0040] 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 contact system, characterized in that: include: A stationary contact, a moving contact and an arc extinguishing chamber, wherein the stationary contact and the moving contact are connected by a connecting plate, and the arc extinguishing chamber is located on the upper part of the stationary contact; It also includes a heat sink, which is located at the connection between the static contact and the connection plate, and is used to reduce the temperature inside the circuit breaker. The heat sink is fixed at the connection between the static contact and the connection plate through a fixing member; The radiator comprises a bottom plate, and a plurality of grid plates are evenly arranged along the length direction of the bottom plate, and heat dissipation channels are formed between adjacent grid plates.

2. The contact system according to claim 1, characterized in that: One end of the grid sheet close to the bottom plate is connected to the bottom plate, and one end of the grid sheet away from the bottom plate extends toward one end away from the bottom plate.

3. The contact system according to claim 2, characterized in that: The grid sheet is in the shape of a rectangle.

4. The contact system according to claim 1, characterized in that: The spacing between the heat dissipation channels is 0.2mm-0.5mm.

5. The contact system according to claim 2, characterized in that: The bottom plate is also provided with a plurality of mounting holes, and the inner surfaces of the mounting holes are provided with internal threads. After fasteners pass through the mounting holes, the bottom plate is fixed to the stationary contact and the connecting plate.

6. The contact system according to claim 5, characterized in that: The bottom plate and the grid sheet are connected by welding or integrally forming.

7. The contact system according to claim 6, characterized in that: The bottom plate and the grid are made of aluminum.

8. The contact system according to claim 1, characterized in that: It also includes an arc isolation plate, which is located on the outer side of the heat sink and is used to isolate the heat sink inside the circuit breaker.

9. The contact system according to claim 8, characterized in that: The arc isolation plate is rectangular, and a plurality of heat dissipation holes are evenly opened on the rectangular arc isolation plate. The arc isolation plate is made of epoxy board or melamine board.

10. A circuit breaker, characterized in that: A contact system comprising any one of claims 1 to 9.

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