Circuit breaker with airflow buffering effect

Abstract

The utility model provides a circuit breaker with an airflow buffering effect, which relates to the technical field of circuit breakers and comprises an arc running channel, an arc extinguishing chamber and an exhaust structure, the exhaust structure comprises a main exhaust channel, an airflow buffering chamber and an arc outlet, the airflow buffering chamber is connected with the main exhaust channel through an inlet and an outlet, and the main exhaust channel is connected with the arc outlet. The inlet and the outlet are arranged in parallel, and the volume of the airflow buffer chamber is at least half larger than that of the main exhaust passage. Through the arrangement of the airflow buffer chamber, part of airflow is cooled in the airflow buffer chamber and then discharged through the outlet to form an annular airflow buffer channel, the airflow is effectively prevented from rebounding back to the arc running channel, and therefore the breaking capacity of a product is improved, electric arcs and the airflow can be cooled through the arrangement of the airflow buffer chamber, and the service life of the product is prolonged. And metal particles sprayed from the arc outlet can be effectively reduced, so that the grid distance of product breaking can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker with airflow buffering effect. Background Art

[0002] Currently, most high-breaking products on the market use gas-generating arc-isolating walls. However, the gas-generating arc-isolating walls generate a large amount of gas pressure when breaking, which is easy to rebound when hitting the shell wall, causing the back of the product to be punctured, thereby causing the product breaking test to fail. In view of the above defects, this application is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a circuit breaker with an airflow buffering effect. By setting an airflow buffer chamber, part of the airflow can be effectively buffered, the probability of breakdown behind the product can be reduced, and the breaking capacity of the product can be effectively improved.

[0004] In order to solve the above problems, the utility model provides a circuit breaker with airflow buffering effect, including an arc running channel, an arc extinguishing chamber and an exhaust structure, the exhaust structure including a main exhaust duct, an airflow buffer chamber and an arc outlet, the airflow buffer chamber is connected to the main exhaust duct through an inlet and an outlet, the main exhaust duct is connected to the arc outlet, the inlet and the outlet are arranged in parallel, and the volume of the airflow buffer chamber is at least greater than half of the volume of the main exhaust duct.

[0005] According to an embodiment of the utility model, a partition is provided in the main exhaust duct, and the partition divides the main exhaust duct into an upper exhaust duct and a lower exhaust duct.

[0006] According to an embodiment of the utility model, the airflow buffer chamber is connected to the lower exhaust duct.

[0007] According to an embodiment of the utility model, the diameter of the arc outlet is smaller than the diameter of the main exhaust duct.

[0008] According to an embodiment of the utility model, the arc outlet and the lower exhaust duct are on the same straight line.

[0009] According to an embodiment of the utility model, a reverse slope is provided on a side of the partition close to the arc extinguishing chamber.

[0010] According to an embodiment of the present invention, the inlet is closer to the arc extinguishing chamber than one end of the partition.

[0011] According to an embodiment of the utility model, an airflow guide plate is provided in the arc extinguishing chamber.

[0012] According to an embodiment of the present invention, the airflow guide plate is arc-shaped.

[0013] According to an embodiment of the present invention, the airflow buffer chamber is configured as a rectangular parallelepiped space.

[0014] The beneficial effect of the utility model is that by setting up an airflow buffer chamber, part of the airflow is cooled in the airflow buffer chamber and then discharged through the outlet to form an annular airflow buffer channel, which effectively prevents the airflow from rebounding back to the arc channel, thereby improving the product breaking ability. The setting of the airflow buffer chamber can also cool the electric arc and airflow, and can effectively reduce the ejection of metal particles from the arc outlet, thereby reducing the grid distance of product breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of a circuit breaker with airflow buffering effect;

[0017] Figure 2 Schematic diagram of air flow. DETAILED DESCRIPTION

[0018] The following description is only used to disclose the utility model so that those skilled in the art can implement the utility model. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the utility model.

[0019] A circuit breaker with airflow buffering effect, such as Figure 1 , including an arc running channel 7, an arc extinguishing chamber 6 and an exhaust structure, as well as a shell, an operating component, a wiring component, a contact component, a trip component, a bimetal component, etc. The principle of this part is consistent with that of the existing circuit breakers and will not be repeated here. The exhaust structure includes a main exhaust duct, an airflow buffer chamber 4 and an arc outlet 1. The airflow buffer chamber 4 is connected to the main exhaust duct through an inlet 41 and an outlet 42. The main exhaust duct is connected to the arc outlet 1. The inlet 41 and the outlet 42 are arranged in parallel. The volume of the airflow buffer chamber 4 is at least greater than half of the volume of the main exhaust duct to ensure the airflow buffering effect.

[0020] Specifically, the arc running channel 7, the arc extinguishing chamber 6 and the exhaust structure are arranged in sequence, the arc extinguishing chamber 6 is provided with an arc extinguishing grid, and the main exhaust channel refers to Figure 1The narrowed portion of the width connected to the arc extinguishing chamber 6, further, a partition 8 is provided in the main exhaust duct, the partition 8 divides the main exhaust duct into an upper exhaust duct 2 and a lower exhaust duct 3, the airflow buffer chamber 4 is connected to one of the exhaust ducts, and the other exhaust duct is normally exhausted. In this embodiment, the airflow buffer chamber 4 is connected to the lower exhaust duct 3, closer to the outside of the shell, and convenient for cooling. The airflow buffer chamber 4 is set as a rectangular space. In other embodiments, the airflow buffer chamber 4 is not limited to a rectangular space, and can also be set as a space of other shapes; optionally, a porous plate can be provided at the outlet 42 to filter and intercept metal particles.

[0021] Furthermore, in order to ensure that part of the airflow can smoothly enter the airflow buffer chamber 4, as Figure 1 As shown, the inlet 41 is closer to the arc extinguishing chamber 6 than one end of the partition 8, that is, the partition 8 does not block the top of the inlet 41. In order to help prevent airflow rebound, the partition 8 is provided with a reverse slope 81 on the side close to the arc extinguishing chamber 6.

[0022] The diameter of the arc outlet 1 can be set to be smaller than the diameter of the main exhaust duct. Figure 1 The arc outlet 1 and the lower exhaust duct 3 are in the same straight line, which can reduce the ejection of metal ions. Optionally, two arc outlets 1 can be provided, connected to the upper exhaust duct 2 and the lower exhaust duct 3 respectively.

[0023] Preferably, an airflow guide plate 5 is provided in the arc extinguishing chamber 6. The airflow guide plate 5 is an arc-shaped or inclined straight plate, which is used to guide the airflow in the arc extinguishing chamber 6 to the main exhaust duct and achieve a certain effect of blocking rebound airflow.

[0024] like Figure 2 After the airflow enters the main exhaust duct, part of the airflow enters the airflow buffer chamber 4 through the inlet 41, is cooled in the airflow buffer chamber 4, and this part of the airflow cannot return to the arc extinguishing chamber area, and then is discharged through the outlet 42 to form an annular airflow buffer channel, which effectively prevents the arc from being broken and the airflow from rebounding back to the arc running channel, thereby improving the product breaking capacity. The setting of the airflow buffer chamber 4 can also cool the arc and airflow, which can effectively reduce the metal particles ejected from the arc outlet 1, thereby reducing the grid distance of the product breaking.

[0025] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed and modified in any way.

Claims

1. A circuit breaker with airflow buffering effect, characterized in that: The invention comprises an arc running channel (7), an arc extinguishing chamber (6) and an exhaust structure, wherein the exhaust structure comprises a main exhaust duct, an airflow buffer chamber (4) and an arc outlet (1), wherein the airflow buffer chamber (4) is connected to the main exhaust duct via an inlet (41) and an outlet (42), wherein the main exhaust duct is connected to the arc outlet (1), wherein the inlet (41) and the outlet (42) are arranged in parallel, and the volume of the airflow buffer chamber (4) is at least greater than half the volume of the main exhaust duct.

2. The circuit breaker with airflow buffering effect according to claim 1, characterized in that: A partition (8) is provided in the main exhaust duct, and the partition (8) divides the main exhaust duct into an upper exhaust duct (2) and a lower exhaust duct (3).

3. The circuit breaker with airflow buffering effect according to claim 2, characterized in that: The airflow buffer chamber (4) is connected to the lower exhaust duct (3).

4. The circuit breaker with airflow buffering effect according to claim 3, characterized in that: The diameter of the arc outlet (1) is smaller than the diameter of the main exhaust passage.

5. The circuit breaker with airflow buffering effect according to claim 4, characterized in that: The arc outlet (1) and the lower exhaust duct (3) are located on the same straight line.

6. The circuit breaker with airflow buffering effect according to any one of claims 2 to 5, characterized in that: A reverse slope (81) is provided on the side of the partition (8) close to the arc extinguishing chamber (6).

7. The circuit breaker with airflow buffering effect according to claim 6, characterized in that: The inlet (41) is closer to the arc extinguishing chamber (6) than one end of the partition (8).

8. The circuit breaker with airflow buffering effect according to claim 6, characterized in that: An airflow guide plate (5) is arranged in the arc extinguishing chamber (6).

9. The circuit breaker with airflow buffering effect according to claim 8, characterized in that: The airflow guide plate (5) is arc-shaped.

10. The circuit breaker with airflow buffering effect according to claim 1, characterized in that: The airflow buffer chamber (4) is configured as a rectangular parallelepiped space.

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