Circuit breaker or isolating switch

Abstract

The invention belongs to the technical field of switches, and particularly relates to a circuit breaker or an isolating switch, which is characterized in that a backflow channel structure is additionally arranged on the side wall of an arc extinguish chamber, after the circuit breaker or the isolating switch arches, an arc moves upwards, the pressure above the arc extinguish chamber is increased, and the pressure in a middle area of a moving contact and a static contact below the arc is reduced; the backflow channel is used for supplementing the upper cold gas to the post-arc space gas, arc falling is inhibited, and the arc extinguishing performance of the product is improved.

Description

Technical Field

[0001] This application belongs to the field of switch technology, and specifically relates to a circuit breaker or a disconnector. Background Art

[0002] When a circuit breaker or a disconnector is opened, the arc moves towards the arc extinguishing chamber, and the pressure in the space behind drops, which will generate a force to pull the arc away from the arc extinguishing chamber. In the prior art, the pressure in the space behind the arc replenishes slowly, which easily causes the arc to fall back. Summary of the Invention

[0003] In order to solve the above technical problems, this application provides the following technical solutions:

[0004] A circuit breaker or a disconnector, the circuit breaker or the disconnector includes an arc extinguishing chamber, and a plurality of return channels are provided on the side wall of the arc extinguishing chamber or on a component fixed to the side wall of the arc extinguishing chamber, connecting the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber.

[0005] Preferably, the side walls of the arc extinguishing chamber are the left and right side walls of the arc extinguishing chamber.

[0006] Preferably, a return channel is provided on the outer side wall of the arc extinguishing chamber, connecting the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber, and internal communication channels are provided between the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber and the return channel respectively.

[0007] Preferably, a return channel is provided on the inner side wall of the arc extinguishing chamber, connecting the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber.

[0008] Preferably, the components fixed to the side wall of the arc extinguishing chamber include an outer grid fixed partition, an inner grid fixed partition and a gas generating part. A first return channel is formed between the outer grid fixed partition and the inner grid fixed partition, and a second return channel is formed by the inner concave of the gas generating part. The first return channel and the second return channel are connected to each other to form the return channel.

[0009] Preferably, the width between the two sides of the air flow channel is not less than 1 / 8 of the width of the arc extinguishing chamber.

[0010] Preferably, a static contact is provided on the front side of the area below the arc extinguishing chamber, and the air flow channel is located on one side of the static contact.

[0011] Preferably, the distance between the air flow channel and the static contact is 1 / 10 to 1 / 3 of the width of the arc extinguishing chamber.

[0012] Compared with the prior art, the beneficial effects achieved by the present application are as follows: By adding a reflux channel structure to the side wall of the arc extinguishing chamber, after the circuit breaker or disconnector arcs, the arc moves upward, increasing the pressure above the arc extinguishing chamber, while the pressure in the middle region between the moving and static contacts below the arc decreases. The reflux channel is used to supplement the cold gas above to the gas space after the arc, suppressing the arc from falling back and improving the arc extinguishing performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings:

[0014] Figure 1 is a three-dimensional view of the overall structure of the mechanism of the present application;

[0015] Figure 2 is a three-dimensional structural schematic diagram showing the fixed partition of the grid plates;

[0016] Figure 3 is a central cross-sectional view of the arc extinguishing chamber (the arrows in the figure indicate the direction of the gas flow in the arc extinguishing chamber after arcing);

[0017] Figure 4 is a cross-sectional view of the reflux channel of the arc extinguishing chamber (the arrows in the figure indicate the direction of the gas flow in the reflux channel);

[0018] Figure 5 is a horizontal cross-sectional view of the arc extinguishing grid plates;

[0019] Figure 6 is a horizontal cross-sectional view of the arc extinguishing grid plates with the reflux channel located outside the arc extinguishing chamber;

[0020] Figure 7 is a vertical cross-sectional view of the arc extinguishing grid plates with the reflux channel located outside the arc extinguishing chamber (the arrows in the figure indicate the directions of the gas flow in the reflux channel and the arc extinguishing chamber);

[0021] In the figure: moving contact assembly 1, moving contact busbar 11, middle region between moving and static contacts 12, static contact 2, gas generating part 3, arc extinguishing grid plates 4, space above the arc extinguishing chamber 41, inner grid plate fixed partition 42, outer grid plate fixed partition 43, reflux channel 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. 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 protection scope of the present application.

[0023] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0024] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] As Figures 1 to 7 shown, this embodiment provides a circuit breaker or disconnecting switch, which includes a moving contact assembly and a moving contact busbar, a static contact corresponding to the moving contact assembly, a gas generating component is provided in the upper region of the moving contact assembly and the static contact, an arc extinguishing grid is provided in the upper region of the gas generating component, the arc extinguishing grid is fixed by a grid fixing partition, and there is a certain interval between the top of the arc extinguishing chamber and the arc extinguishing grid, which is defined as the upper space of the arc extinguishing chamber.

[0026] The improvement of the present application lies in that a return channel is provided between the upper space of the arc extinguishing chamber and the lower space where the moving contact assembly and the static contact are installed. The return channel includes a side channel of the grid and a side channel of the gas generating component. The return channel can be provided in the area where the arc extinguishing grid and the gas generating component are close to the housing. For example, in the area corresponding to the arc extinguishing grid, an inner layer grid fixing partition can be added, and a return channel is formed between the inner layer grid fixing partition and the outer layer grid fixing partition. The width of the arc extinguishing grid corresponding to this area is shortened, and it is changed from being originally fixed on the outer layer grid fixing partition to being fixed on the inner layer grid fixing partition. When the return channel passes downward through the part of the gas generating component, the corresponding part of the gas generating component is concave to form a return channel, so that the return channel conducts the upper space of the arc extinguishing chamber and the lower space where the moving contact assembly and the static contact are installed.

[0027] The reflux channel can also be arranged outside the circuit breaker or disconnector housing. By adding a reflux channel outside the circuit breaker or disconnector housing, a communication channel is then set up between the space above the arc extinguishing chamber and the externally added reflux channel, and a communication channel is also set up between the space below the moving contact assembly and the static contact and the externally added reflux channel. A reflux channel structure is added to the side wall of the arc extinguishing chamber. After the circuit breaker or disconnector arcs, the arc moves upward, increasing the pressure above the arc extinguishing chamber, while the pressure in the middle area between the moving and static contacts below the arc decreases. The cold gas above is supplemented into the space behind the arc through the reflux channel to inhibit the arc from falling back and improve the arc extinguishing performance of the product.

[0028] Furthermore, the air flow channel is located on the side of the static contact. The width between the two sides of the air flow channel is not less than 1 / 8 of the width of the arc extinguishing chamber (here, the width refers to the width between the front and rear side walls of the arc extinguishing chamber parallel to the arc extinguishing grid). In the middle of the air flow channel, the distance from the static contact can be 1 / 10 to 1 / 3 of the width of the arc extinguishing chamber (here, the width refers to the width between the front and rear side walls of the arc extinguishing chamber parallel to the arc extinguishing grid). Because in the area below the static contact, this area is most prone to arc drop. When the moving contact assembly quickly disconnects, the space in this area changes from small to large, and the air pressure will rapidly decrease, thus forming a large air pressure difference with the high air pressure formed in the arc extinguishing chamber. Due to the action of the air pressure difference, the arc is easily dropped. By introducing the cold air at the top of the arc extinguishing chamber into this area through the air flow channel, the air pressure difference is reduced and the arc drop is inhibited.

[0029] Furthermore, the inner grid fixed partition can be fixed on the grid beside the reflux channel or on the outer grid fixing plate.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Finally, it should be stated that the above are only preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A circuit breaker or disconnecting switch, characterized in that, The circuit breaker or disconnecting switch includes an arc extinguishing chamber, and a plurality of reflux channels are provided on the side wall of the arc extinguishing chamber or a component fixed to the side wall of the arc extinguishing chamber, which communicate the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber.

2. The circuit breaker or disconnecting switch according to claim 1, characterized in that, The side wall of the arc extinguishing chamber is the left and right side walls of the arc extinguishing chamber.

3. A circuit breaker or disconnecting switch according to claim 1, characterized in that, The outer side wall of the arc extinguishing chamber is provided with a reflux channel, which communicates the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber. An internal communication channel is provided between the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber and the reflux channel respectively.

4. A circuit breaker or disconnecting switch according to claim 1, characterized in that, The inner side wall of the arc extinguishing chamber is provided with a reflux channel, which communicates the top space of the arc extinguishing chamber and the area below the arc extinguishing chamber.

5. A circuit breaker or disconnector according to claim 1, characterized in that, The component fixed to the side wall of the arc extinguishing chamber includes an outer grid plate fixing partition, an inner grid plate fixing partition and a gas generating part. A first reflux channel is formed between the outer grid plate fixing partition and the inner grid plate fixing partition. The gas generating part is concave to form a second reflux channel. The first reflux channel and the second reflux channel communicate with each other to form the reflux channel.

6. A circuit breaker or disconnector according to any one of claims 1 to 5, characterized in that The width between the two sides of the air flow channel is not less than 1 / 8 of the width of the arc extinguishing chamber.

7. A circuit breaker or disconnector according to any one of claims 1 to 5, characterized in that, A static contact is provided on the front side of the area below the arc extinguishing chamber, and the air flow channel is located on one side of the static contact.

8. A circuit breaker or disconnector according to claim 7, characterized in that, The distance between the air flow channel and the static contact is 1 / 10 to 1 / 3 of the width of the arc extinguishing chamber.

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