Arc extinguish chamber structure

Abstract

According to the arc extinguish chamber structure provided by the invention, the arc extinguish chamber is provided with an air flow channel area from the separation position of a moving contact and a static contact to the edge position of the end part of the lower side of an arc extinguish grid plate group, and a flow guide piece is arranged in the air flow channel area and divides the air flow channel area into at least two sub-channels. The diversion member is arranged on the arc channel through which the breaking arc of the moving and static contacts enters the arc extinguish chamber, so that the arc channel is divided into a plurality of sub-channels, the eddy current phenomenon is reduced, the arc foot of the arc smoothly moves towards the direction of the arc extinguish chamber, and the breaking performance of the circuit breaker is improved.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to an arc-extinguishing chamber structure. Background Technology

[0002] In industrial low-voltage power systems, circuit breakers are an important component of the power distribution network. They are used to distribute electrical energy, connect and disconnect current in the power grid circuit, and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. They are an essential part of the power supply system.

[0003] Low-voltage circuit breakers mainly consist of a controller, contact system, arc-extinguishing chamber, and operating mechanism. Among these, the arc-extinguishing chamber is a crucial functional component, its performance directly impacting the circuit breaker's electrical life and breaking capacity. Existing circuit breaker arc-extinguishing chambers rely on the "magnetic field" generated by the conductive circuit of the contacts and the "air blowing" generated by the expanding gas during breaking to drive the arc into the chamber. The arc is then cut into multiple short arc segments by the grid plates, thereby increasing the arc voltage and extinguishing the arc. With the increasing voltage levels of new energy systems, high-voltage breaking requirements have been placed on circuit breakers. As the power supply voltage increases, it is necessary to gradually increase the number of arc-extinguishing grid plates in the arc-extinguishing chamber to improve its arc-extinguishing capacity. However, increasing the number of grid plates often limits the increase in the circuit breaker's opening distance within a limited space. To increase the opening distance, moving and stationary contacts need to be placed at a greater distance from the arc-extinguishing chamber. To guide the arc generated by the breaking of the moving and stationary contacts into the arc-extinguishing chamber, as shown in the attached diagram... Figure 1 As shown, it is generally necessary to set dynamic and static arc-initiating plates at both ends of the arc-extinguishing grid. However, this structure results in a relatively large tilt angle of the dynamic and static arc-initiating plates. During the arc ignition process, there will be eddy current phenomenon and the arc root will not transfer. The arc root stagnation and non-transfer will lead to low utilization of the arc-extinguishing grid at both ends of the arc-extinguishing chamber, low overall arc voltage, and thus unsuccessful arc extinguishing, causing the circuit breaker to fail to open. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing circuit breaker arc-extinguishing chambers, especially those for high-voltage circuit breakers, where eddy currents exist during arc ignition, preventing arc root transfer and leading to unsuccessful arc extinguishing and circuit breaker failure. This invention provides an arc-extinguishing chamber structure that incorporates a current-guiding element on the arc path leading from the moving and stationary contacts to the arc-extinguishing chamber. This divides the arc path into several sub-channels, reducing eddy currents and allowing the arc foot to move smoothly towards the arc-extinguishing chamber, thus improving the circuit breaker's breaking performance.

[0005] Technical solution

[0006] To achieve the above-mentioned technical objectives, the present invention provides an arc-extinguishing chamber structure, wherein the arc-extinguishing chamber has an airflow channel area from the position where the moving contact and the stationary contact are separated to the arc-extinguishing grid plate group, characterized in that: a flow guide is provided in the airflow channel area, and the flow guide divides the airflow channel into at least two sub-channels.

[0007] In one embodiment, the arc-extinguishing chamber includes a support plate, a gas-generating component is mounted on the bottom surface of the support plate, and an arc-extinguishing grid assembly is inserted into the gas-generating component on the side away from the separation area of ​​the moving contact and the stationary contact. A stationary arc-inducing plate is mounted on the side end of the arc-extinguishing grid assembly corresponding to the stationary contact, and a moving arc-inducing plate is mounted on the side end of the arc-extinguishing grid assembly corresponding to the moving contact. The stationary arc-inducing plate extends to the end of the stationary contact and corresponds to the stationary contact, and the moving arc-inducing plate extends to the end of the moving contact and corresponds to the moving contact at the maximum breaking position. The upper opening formed by the moving arc-inducing plate and the stationary arc-inducing plate is larger than the lower opening.

[0008] In one embodiment, the moving arc-inducing plate, the stationary arc-inducing plate, the support plate, the gas-generating component, the separation position of the moving and stationary contacts, and the arc-extinguishing grid plate assembly form an airflow channel area, and the portion of the airflow channel area formed by the arc-extinguishing grid plate assembly forms the upper side of the airflow channel area.

[0009] In one embodiment, there is a gap between the guide and the upper side of the airflow channel region.

[0010] In one embodiment, the airflow channel is divided into a central airflow region and a left airflow region and a right airflow region located on both sides of the central airflow region, with at least one guide element located in the left airflow region and / or at least one guide element located in the central airflow region and / or at least one guide element located in the right airflow region.

[0011] In one embodiment, at least one arc-extinguishing grid plate, located between the middle of the two ends of the portion of the airflow channel region formed by the arc-extinguishing grid plate assembly, extends toward one end of the arc-extinguishing chamber near the separation region of the moving and stationary contacts, and the region where the at least one arc-extinguishing grid plate is located corresponds to the central airflow region.

[0012] In one embodiment, at least one guide is located in the right airflow region, and the projections of each guide and at least one arc-extinguishing grid corresponding to the middle airflow region onto the plane where the bottom surface of the support plate is located on the length direction of the arc-extinguishing grid group at least partially overlap.

[0013] In one embodiment, at least one guide is located in the left airflow region, and the projection of the portion of the airflow channel region formed by the combination of each guide and at least one arc-extinguishing grid corresponding to the middle airflow region on the plane where the bottom surface of the support plate is located at least partially overlaps with the projection of the arc-extinguishing grid group along its length.

[0014] In one embodiment, the slot of the at least one arc-quenching grid extends downward.

[0015] In one embodiment, the flow guide is mounted on the gas generating member or the support member.

[0016] In one embodiment, the flow guide is a metal or non-metal component, and the corresponding flow guide is integrally formed with or fixed on the support plate, or the corresponding flow guide is integrally formed with or fixed on the gas generating component.

[0017] In one embodiment, the flow guide is provided with an air inlet.

[0018] In one embodiment, the guide element is square, triangular, trapezoidal, or irregular in shape.

[0019] Beneficial effects

[0020] This invention provides an arc-extinguishing chamber structure. The arc-extinguishing chamber has an airflow channel region extending from the separation position of the moving and stationary contacts to the lower edge of the arc-extinguishing grid assembly. A flow guide is provided in the airflow channel region, dividing the airflow channel region into at least two sub-channels. By providing a flow guide on the arc channel through which the arc enters the arc-extinguishing chamber from the moving and stationary contacts, the arc channel is divided into several sub-channels, reducing eddy current phenomena and allowing the arc foot to move smoothly towards the arc-extinguishing chamber, thus improving the breaking performance of the circuit breaker. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Appendix Figure 1 This is a schematic diagram of the arc-extinguishing chamber structure in the existing technology;

[0023] Appendix Figure 2 This is a schematic diagram of the arc-extinguishing chamber structure in an embodiment of the present invention;

[0024] Appendix Figure 3 This is a schematic diagram of the contact system and arc-extinguishing chamber structure in an embodiment of the present invention;

[0025] Appendix Figure 4 This is a schematic diagram of the position of the flow guide in an embodiment of the present invention;

[0026] Appendix Figure 5 This is a schematic diagram of the gas-generating component in an embodiment of the present invention;

[0027] Appendix Figure 6 This is a schematic diagram showing the installation positions of the flow guide, gas generating component, and support component in an embodiment of the present invention;

[0028] Appendix Figure 7a This is a schematic diagram of the shape of the flow guide in an embodiment of the present invention. Figure 1 ;

[0029] Appendix Figure 7b This is a schematic diagram of the shape of the flow guide in an embodiment of the present invention. Figure 2 ;

[0030] Appendix Figure 7c This is a schematic diagram of the shape of the flow guide in an embodiment of the present invention. Figure 3 ;

[0031] Appendix Figure 7d This is a schematic diagram of the shape of the flow guide in an embodiment of the present invention. Figure 4 ;

[0032] Appendix Figure 7e This is a schematic diagram of the shape of the flow guide in an embodiment of the present invention. Figure 5 ;

[0033] Appendix Figure 8a This is a schematic diagram of the number of flow guides in an embodiment of the present invention. Figure 1 ;

[0034] Appendix Figure 8b This is a schematic diagram of the number of flow guides in an embodiment of the present invention. Figure 2 ;

[0035] Appendix Figure 8c This is a schematic diagram of the number of flow guides in an embodiment of the present invention. Figure 3 ;

[0036] Appendix Figure 9a This is a schematic diagram of the position of the flow guide in an embodiment of the present invention. Figure 1 ;

[0037] Appendix Figure 9b This is a schematic diagram of the position of the flow guide in an embodiment of the present invention. Figure 2 ; Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0043] Example

[0044] In existing circuit breaker arc-extinguishing chambers, especially those for high-voltage circuit breakers, when the upper opening formed by the moving arc-starting plate 101b and the stationary arc-starting plate 101a is larger than the lower opening, eddy currents occur during arc ignition, preventing arc root transfer and resulting in unsuccessful arc extinguishing and circuit breaker breaking failure. To address this problem, this embodiment provides an arc-extinguishing chamber structure. The arc-extinguishing chamber 1 has an airflow channel region a from the position where the moving contact 2 and the stationary contact 3 separate to the lower edge of the arc-extinguishing grid assembly 101. The airflow channel region a is characterized by having a guide element 4 that divides the airflow channel region a into at least two sub-channels.

[0045] As attached Figure 2 and 3 As shown, the arc-extinguishing chamber 1 includes a support plate 102, a gas generating component 103 is mounted on the bottom surface of the support plate 102, and an arc-extinguishing grid assembly 101 is inserted into the gas generating component 103 on the side away from the separation area of ​​the moving contact 2 and the stationary contact 3. A stationary arc-inducing plate 101a is mounted on the side end of the arc-extinguishing grid assembly 101 corresponding to the stationary contact 3, and a moving arc-inducing plate 101b is mounted on the side end of the arc-extinguishing grid assembly 101 corresponding to the moving contact 2. The stationary arc-inducing plate 101a extends to the end of the stationary contact 3 and corresponds to the stationary contact 3, and the moving arc-inducing plate 101b extends to the end of the moving contact 2 and corresponds to the moving contact 2 at the maximum breaking position. The upper opening formed by the moving arc-inducing plate 101b and the stationary arc-inducing plate 101a is larger than the lower opening. The moving arc-inducing plate 101b, the stationary arc-inducing plate 101a, the support plate 102, the gas-generating component 103, the separated positions of the moving contact 2 and the stationary contact 3, and the arc-extinguishing grid assembly 101 enclose an airflow channel region a. The portion of the arc-extinguishing grid assembly 101 that encloses the airflow channel region a forms the upper side of the airflow channel region a, and there is a gap between the guide component 4 and the upper side of the airflow channel region a.

[0046] The airflow channel region a is divided into a central airflow region a1 and two airflow regions a2 and a3 located on either side of the central airflow region a1. At least one arc-extinguishing grid plate 101c, located between the middle of both ends of the portion of the airflow channel region a formed by the arc-extinguishing grid plate assembly 101, extends towards one end of the arc-extinguishing chamber 1 near the separation area between the moving contact 2 and the stationary contact 3, and the area where this at least one arc-extinguishing grid plate 101c is located corresponds to the central airflow region a1. (See attached diagram) Figure 4 As shown, the slot 101c01 of the at least one arc-extinguishing grid plate 101c extends downward to facilitate the cutting of the electric arc.

[0047] At least one guide element 4 is located in the left airflow region a2 and / or at least one guide element 4 is located in the middle airflow region a1 and / or at least one guide element 4 is located in the right airflow region a3. In this embodiment, since the electric arc first appears on the right side when the moving and stationary contacts are disconnected, the electric arc in the right airflow region is stronger, and a strong eddy current will appear in the right airflow region. Therefore, at least one guide element 4 is arranged in the right airflow region a3, and the portion of the airflow channel region a formed by the combination of each guide element 4 and at least one arc-extinguishing grid plate 101c corresponding to the middle airflow region a1 is projected onto the plane where the bottom surface of the support plate 102 is located (i.e., Figure 2 The projection of the perpendicular direction of the paper onto the length direction of the arc-extinguishing grid assembly 101 (i.e., the projection of the arc-extinguishing grid assembly 101) Figure 2The projections in the left and right directions at least partially overlap, thus ensuring that at least one guide element 4 is used to reduce eddy currents at the narrow section between at least one arc-extinguishing grid plate 101c and the stationary arc-inducing plate; furthermore, when the moving and stationary contacts are fully open, the arc on the left side is weaker, and the eddy currents in the airflow region on the left side are also weaker, as shown in the attached figure. Figure 4 As shown, at this time, placing at least one guide element 4 in the left airflow region a2, and the projection of the portion of the airflow channel region a formed by the combination of each guide element 4 and at least one arc-extinguishing grid plate 101c corresponding to the middle airflow region a1 on the plane where the bottom surface of the support plate 102 is located on the projection of the arc-extinguishing grid plate group 101 in the length direction at least partially coincides with the projection of the arc-extinguishing grid plate group 101, can further reduce the left vortex phenomenon.

[0048] Among them, the guide member 4 located in the central airflow region a1 serves to divert the arc entering from the arc inlet of the arc-extinguishing chamber to both sides of the arc-extinguishing grid assembly, while the guide members 4 located in the left airflow region a2 and the right airflow region a3 can reduce the occurrence of high-speed fluid vortices in the arc. Further, as shown in the attached... Figure 5 and 6 As shown, the guide 4 is provided with an air inlet 401, which facilitates the balance of air pressure in the corresponding local airflow area when the local air pressure is high.

[0049] In this embodiment, as shown in the appendix Figure 5 and 6 As shown, the guide member 4 is a raised rib, and it can be mounted on either the gas generating member 103 or the support member 102. The guide member 4 can be a single piece or assembled from two pieces. In this embodiment, each side of the gas generating member 103 on both sides of the arc-extinguishing chamber 1 has half of the guide member 4. After installation, the half of the guide member 4 on each side of the gas generating member 103 corresponds to and is spliced ​​together to form a complete guide member 4. Alternatively, the complete guide member 4 can be mounted on one side of the gas generating member 103, with no gap or a certain gap between the guide member 4 and the other side of the gas generating member 103. The flow guide 4 can be a metal or non-metal part: when the flow guide 4 is a metal part, the corresponding flow guide 4 is fixed on the support plate 102; when the flow guide 4 is a non-metal part, the corresponding flow guide 4 is integrally formed with the support plate 102 or the gas generating part 103, or the flow guide 4 is fixed on the support plate 102 or the gas generating part 103; at the same time, when the flow guide 4 is a non-metal part, the corresponding flow guide 4 can also be fixed on the arc extinguishing grid plate group 101, and there is no gap between the lower end edge of the part of the airflow channel area a enclosed by the flow guide 4 and the arc extinguishing grid plate group 101.

[0050] Additionally, as attached Figure 7a As shown in figures 7b, 7c, 7d, and 7e, the shape of the guide element 4 is square, triangular, trapezoidal, or irregular. (See attached figures.) Figure 8aAs shown in Figures 8b and 8c, the number of the guide vanes 4 in each side airflow region can also be arranged according to the actual needs of the arc-extinguishing chamber structure. (See attached figures) Figure 9a As shown in Figure 9b, there is no restriction on whether the flow guide 4 is arranged simultaneously or individually in the central airflow region a1, the left airflow region a2, and the right airflow region a3. Following the technical principles of this embodiment, regardless of the installation method of the flow guide 4, its purpose is the same: when the flow guide 4 is located in the central airflow region a1, it serves to divert the flow, mainly diverting the arc entering from the arc inlet of the arc-extinguishing chamber to both sides of the arc-extinguishing grid assembly; while when located in the left airflow region a2 and the right airflow region a3, it can reduce the occurrence of high-speed fluid vortices in the arc.

[0051] This embodiment provides an arc-extinguishing chamber structure. The arc-extinguishing chamber 1 has an airflow channel a from the region where the moving contact 2 and the stationary contact 3 are separated to the region of the internal arc-extinguishing grid assembly 101. The airflow channel a is characterized by having a guide element 4, which divides the airflow channel a into at least two sub-channels. By providing a guide element on the arc channel through which the arc from the moving and stationary contacts enters the arc-extinguishing chamber, the arc channel is divided into several sub-channels, reducing eddy current phenomena and allowing the arc foot to move smoothly towards the arc-extinguishing chamber, thus improving the breaking performance of the circuit breaker.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An arc-extinguishing chamber structure, wherein the arc-extinguishing chamber (1) has an airflow channel region (a) from the position where the moving contact (2) and the stationary contact (3) are separated to the arc-extinguishing grid assembly (101), characterized in that: A guide (4) is provided in the airflow channel area (a), and the guide (4) divides the airflow channel (a) into at least two sub-channels.

2. The arc-extinguishing chamber structure as described in claim 1, characterized in that: The arc-extinguishing chamber (1) includes a support plate (102), a gas generating component (103) is mounted on the bottom surface of the support plate (102), and an arc-extinguishing grid assembly (101) is inserted into the gas generating component (103) on one side away from the separation area of ​​the moving contact (2) and the stationary contact (3). A stationary arc-inducing plate (101a) is mounted on the side end of the arc-extinguishing grid assembly (101) corresponding to the stationary contact (3), and a moving arc-inducing plate (101b) is mounted on the side end of the arc-extinguishing grid assembly (101) corresponding to the moving contact (2). The stationary arc-inducing plate (101a) extends to the end of the stationary contact (3) and corresponds to the stationary contact (3). The moving arc-inducing plate (101b) extends to the end of the moving contact (2) and corresponds to the moving contact (2) at the maximum breaking position. The upper opening formed by the moving arc-inducing plate (101b) and the stationary arc-inducing plate (101a) is larger than the lower opening.

3. The arc-extinguishing chamber structure as described in claim 2, characterized in that: The moving arc-inducing plate (101b), the stationary arc-inducing plate (101a), the support plate (102), the gas-generating component (103), the moving contact (2) and the stationary contact (3) are separated and enclosed by the arc-extinguishing grid plate group (101) to form an airflow channel area (a). The part of the airflow channel area (a) enclosed by the arc-extinguishing grid plate group (101) forms the upper side of the airflow channel area (a).

4. The arc-extinguishing chamber structure as described in claim 3, characterized in that... There is a gap between the guide (4) and the upper side of the airflow channel region (a).

5. The arc-extinguishing chamber structure as described in claim 4, characterized in that: The airflow channel (a) is divided into a central airflow region (a1) and a left airflow region (a2) and a right airflow region (a3) ​​located on both sides of the central airflow region (a1). At least one guide (4) is located in the left airflow region (a2) and / or at least one guide (4) is located in the central airflow region (a1) and / or at least one guide (4) is located in the right airflow region (a3).

6. The arc-extinguishing chamber structure as described in claim 5, characterized in that: At least one arc-extinguishing grid plate (101c) in the middle of the two ends of the portion of the airflow channel region (a) enclosed by the arc-extinguishing grid plate group (101) extends into the arc-extinguishing chamber (1) towards one end near the separation area of ​​the moving contact (2) and the stationary contact (3), and the area where the at least one arc-extinguishing grid plate (101c) is located corresponds to the central airflow region (a1).

7. The arc-extinguishing chamber structure as described in claim 6, characterized in that: At least one guide (4) is located in the right airflow region (a3), and the portion of the airflow channel region (a) formed by the combination of each guide (4) and at least one arc-extinguishing grid plate (101c) corresponding to the middle airflow region (a1) at least partially overlaps with the projection of the bottom surface of the support plate (102) onto the length direction of the arc-extinguishing grid plate group (101).

8. The arc-extinguishing chamber structure as described in claim 7, characterized in that: At least one guide (4) is located in the left airflow region (a2), and the portion of the airflow channel region (a) formed by the combination of each guide (4) and at least one arc-extinguishing grid plate (101c) corresponding to the middle airflow region (a1) at least partially overlaps with the projection of the bottom surface of the support plate (102) onto the length direction of the arc-extinguishing grid plate group (101).

9. The arc-extinguishing chamber structure as described in claim 6, characterized in that: The slot (101c01) of the at least one arc-extinguishing grid plate (101c) extends downward.

10. The arc-extinguishing chamber structure as described in claim 3, characterized in that: The flow guide (4) is mounted on the gas generating component (103) or the support component (102).

11. The arc-extinguishing chamber structure as described in claim 10, characterized in that: The flow guide (4) is a metal or non-metal part. The corresponding flow guide (4) is integrally formed with the support plate (102) or fixed on the support plate (102), or the corresponding flow guide (4) is integrally formed with the gas generating part (103) or fixed on the gas generating part (103).

12. The arc-extinguishing chamber structure as described in claim 1, characterized in that: The flow guide (4) is provided with an air port (401).

13. The arc-extinguishing chamber structure as described in claim 1, characterized in that: The shape of the guide (4) is square, triangular, trapezoidal or irregular.

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