Arc extinguish chamber structure

Abstract

An arc extinguish chamber structure comprises an arc extinguish grid plate group, the arc extinguish grid plate group comprises a transverse arc extinguish grid plate group and a longitudinal arc extinguish grid plate group, one end of the transverse arc extinguish grid plate group is connected with one end of the longitudinal arc extinguish grid plate group, and one side surface of an arc extinguish chamber, which is located at a separation position of a moving contact, exceeds the edge of a shell on the corresponding side. And a space area formed between one side surface of the arc extinguishing chamber, which is located at the separation position of the moving contact, and one end of the corresponding arc extinguishing grid sheet group forms an arc exhaust channel. By changing the structure of the whole arc extinguish chamber, the moving speed of the arc is increased, so that the arc extinguishing capability of the arc extinguish chamber is enhanced.

Description

Technical Field

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

[0002] A circuit breaker is a switching device that can connect, carry, and disconnect current under normal circuit conditions and can close, carry, and disconnect current under abnormal circuit conditions within a specified time.

[0003] An arc-extinguishing chamber is one of the basic methods for extinguishing electric arcs. An arc-extinguishing chamber includes grids, a gas-generating component, a gas passage, and a gas outlet. The metal grids in the arc-extinguishing chamber are stacked and arranged in a specific manner. When an arc is generated between the contacts, the arc is drawn into the arc-extinguishing grids under the contraction force of magnetic lines of force, etc., dividing a long arc into multiple short arcs. By increasing the arc voltage, the fault current decreases, achieving the arc-extinguishing effect.

[0004] In the current low-voltage circuit breaker field, AC switches can withstand up to AC1140V. According to the latest low-voltage electrical appliance industry standards, AC switches will be able to withstand current and voltage up to AC2000V and DC3000V. Especially in the wind power industry, where the system voltage has increased from AC1140V to AC2000V, a higher arc voltage is required to extinguish the arc. To meet the current and voltage breaking requirements, the traditional method is to increase the number of arc-extinguishing plates in the circuit breaker's arc-extinguishing chamber. However, increasing the number of arc-extinguishing plates increases the volume of the arc-extinguishing chamber, raising product costs. Alternatively, the existing arc-extinguishing chamber space may be insufficient, leaving no room to accommodate more arc-extinguishing plates, resulting in poor airflow and difficulty for the arc to enter the arc-extinguishing plates. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the arc-extinguishing chamber of the circuit breaker, which is unable to meet the high breaking capacity requirements, by providing an arc-extinguishing chamber structure. The modification of the entire arc-extinguishing chamber structure enhances the arc movement speed, thereby enhancing the arc-extinguishing capacity of the arc-extinguishing chamber.

[0006] Technical solution

[0007] To achieve the above-mentioned technical objectives, this utility model provides an arc-extinguishing chamber structure, characterized in that: it includes an arc-extinguishing grid assembly, which includes a transverse arc-extinguishing grid assembly and a longitudinal arc-extinguishing grid assembly. One end of the transverse arc-extinguishing grid assembly and one end of the longitudinal arc-extinguishing grid assembly are connected. The side of the arc-extinguishing chamber located at the separation position of the moving contact extends beyond the edge of the corresponding side of the housing. The space formed between the side of the arc-extinguishing chamber located at the separation position of the moving contact and one end of the corresponding arc-extinguishing grid assembly constitutes an arc exhaust channel.

[0008] In one embodiment, the arc-extinguishing chamber has at least one intermediate partition plate arranged in the area between the separation position of the moving contact and the stationary contact and the inner side of the arc-extinguishing grid plate group. The at least one intermediate partition plate divides the area into at least two different arc channels, and the shape of the lower side of the at least one intermediate partition plate matches the closing movement trajectory of the moving contact.

[0009] In one embodiment, one end of the transverse arc-quenching grid assembly and one end of the longitudinal arc-quenching grid assembly are connected to form a configuration. In this configuration, the transverse arc-extinguishing grid group is located above the longitudinal arc-extinguishing grid group, and the upper end of the longitudinal arc-extinguishing grid group is connected to the end of the transverse arc-extinguishing grid group near the moving contact separation position.

[0010] In one embodiment, the arc-extinguishing grids in the transverse arc-extinguishing grid group are arranged from vertically to obliquely as they move from the end furthest from the moving contact separation position to the end closest to the moving contact separation position, thereby connecting with the upper end of the longitudinal arc-extinguishing grid group.

[0011] In one embodiment, the gas generating component is inserted inside the arc-extinguishing grid in the arc-extinguishing grid assembly, and there is space on the gas generating component at a position corresponding to the transverse arc-extinguishing grid assembly and / or the longitudinal arc-extinguishing grid assembly for placing the magnetizing part.

[0012] In one embodiment, a notch is provided on the lower side of the intermediate partition.

[0013] In one embodiment, at least one notch is located on the lower right side of the middle partition.

[0014] In one embodiment, the middle portion of several moving contact pieces in the moving contact is grooved to correspond to at least one intermediate partition plate, so that during the closing process of the moving contact, the lower side of at least one intermediate partition plate can be located at the groove.

[0015] In one embodiment, the arc-extinguishing grid plate in the arc-extinguishing grid plate group has an opening groove on its outer side, and the side of the arc-extinguishing chamber located at the separation position of the moving contact forms an involute exhaust channel with the opening groove on the corresponding side of the arc-extinguishing grid plate group.

[0016] In one embodiment, the gap on the lower right side of the intermediate partition is filled with insulating material.

[0017] Beneficial effects

[0018] This utility model provides an arc-extinguishing chamber structure, which includes an arc-extinguishing grid assembly. The arc-extinguishing grid assembly comprises a transverse arc-extinguishing grid assembly and a longitudinal arc-extinguishing grid assembly. One end of the transverse arc-extinguishing grid assembly and one end of the longitudinal arc-extinguishing grid assembly are connected. The side of the arc-extinguishing chamber located at the moving contact separation position extends beyond the edge of the corresponding side of the housing. The space formed between the side of the arc-extinguishing chamber located at the moving contact separation position and one end of the corresponding arc-extinguishing grid assembly constitutes an arc exhaust channel. This modification to the entire arc-extinguishing chamber structure enhances the arc movement speed, thereby improving the arc-extinguishing capability of the arc-extinguishing chamber. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model 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.

[0020] Appendix Figure 1 This is a schematic diagram of the circuit breaker product in an embodiment of this utility model;

[0021] Appendix Figure 2a It is attached Figure 1 Diagram of direction A in the middle;

[0022] Appendix Figure 2b This is an enlarged schematic diagram of the exhaust channel;

[0023] Appendix Figure 3 This is a schematic diagram of the arc-extinguishing chamber in an embodiment of this utility model;

[0024] Appendix Figure 4 It is attached Figure 3 Diagram of direction B in the middle;

[0025] Appendix Figure 5a This is a three-dimensional schematic diagram of the arc-extinguishing grid assembly in the arc-extinguishing chamber in an embodiment of this utility model;

[0026] Appendix Figure 5b This is a schematic diagram of the arc-extinguishing grid assembly in the arc-extinguishing chamber in an embodiment of this utility model;

[0027] Appendix Figure 6a This is a three-dimensional schematic diagram of the arc-extinguishing grid plate in the arc-extinguishing chamber in an embodiment of this utility model;

[0028] Appendix Figure 6b This is a schematic diagram of the arc-extinguishing grid plate in the arc-extinguishing chamber in an embodiment of this utility model;

[0029] Appendix Figure 7a This is a three-dimensional schematic diagram of the moving contact in an embodiment of this utility model;

[0030] Appendix Figure 7b This is a front view of the moving contact in an embodiment of this utility model;

[0031] Appendix Figure 8a This is a three-dimensional schematic diagram of the middle partition in an embodiment of this utility model;

[0032] Appendix Figure 8b This is a front view of the middle partition in an embodiment of this utility model;

[0033] Appendix Figure 9a The position of the magnetizing part in this embodiment of the utility model Figure 1 ;

[0034] Appendix Figure 9b This is Figure 2, showing the location of the magnetizing part in an embodiment of this utility model;

[0035] Appendix Figure 10a The magnetizing part is installed in the embodiment of this utility model. Figure 1 ;

[0036] Appendix Figure 10b This is Figure 2, showing the installation of the magnetizing part in an embodiment of this utility model; Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Example

[0043] In the current low-voltage circuit breaker field, AC switches can withstand up to AC1140V. According to the latest low-voltage electrical appliance industry standards, AC switches will be able to withstand current and voltage up to AC2000V and DC3000V. Especially in the wind power industry, where the system voltage has increased from AC1140V to AC2000V, a higher arc voltage is required to extinguish the arc. To meet the current and voltage breaking requirements, the traditional method is to increase the number of arc-extinguishing plates in the circuit breaker's arc-extinguishing chamber. However, increasing the number of arc-extinguishing plates increases the volume of the arc-extinguishing chamber, raising product costs. Alternatively, the existing arc-extinguishing chamber space may be insufficient, leaving no room to accommodate more arc-extinguishing plates, resulting in poor airflow and difficulty for the arc to enter the arc-extinguishing plates.

[0044] To solve this problem, see attached... Figure 1 As shown in Figures 2a, 2b, 3, and 4, this embodiment provides an arc-extinguishing chamber structure, which includes an arc-extinguishing grid assembly 1. The arc-extinguishing grid assembly 1 includes a transverse arc-extinguishing grid assembly 1a and a longitudinal arc-extinguishing grid assembly 1b. One end of the transverse arc-extinguishing grid assembly 1a and one end of the longitudinal arc-extinguishing grid assembly 1b are connected. At least one intermediate partition plate 3 is arranged in the area between the separation position of the moving contact 2 and the stationary contact 6 and the inner side of the arc-extinguishing grid assembly 1, as shown in the attached figure. Figure 3 As shown, the at least one intermediate partition 3 divides the region into at least two different arc channels n,n'; in this embodiment, as shown in the attached... Figure 2a As shown in 5a and 5b, one end of the transverse arc-extinguishing grid plate group 1a and one end of the longitudinal arc-extinguishing grid plate group 1b are connected to form a structure. The transverse arc-extinguishing grid assembly 1a is located above the longitudinal arc-extinguishing grid assembly 1b, and the upper end of the longitudinal arc-extinguishing grid assembly 1b is connected to the end of the transverse arc-extinguishing grid assembly 1a near the separation position of the moving contact 1. Specifically, the arc-extinguishing grids 1a01 in the transverse arc-extinguishing grid assembly 1a gradually change from a vertical arrangement to an inclined arrangement as they move from the end away from the separation position of the moving contact 2 to the end near the separation position of the moving contact 2, thus connecting with the upper end of the longitudinal arc-extinguishing grid assembly 1b. The arc-extinguishing grid assembly 1 adopts... The circuit breaker's layout ensures a sufficient number of arc-extinguishing grid plates to extinguish the arc while avoiding a significant increase in the front and rear depth dimensions, thus preventing a substantial increase in product costs.

[0045] As attached Figure 3 As shown, the gas generating component 5 is inserted inside the arc-extinguishing grid plate assembly 1. A space 5a exists on the gas generating component 5 at a position corresponding to the transverse arc-extinguishing grid plate assembly 1a and / or the longitudinal arc-extinguishing grid plate assembly 1b, for accommodating the magnetizing part 7. Specifically, as shown in the attached diagram... Figure 9a As shown in Figures 9b, 10a, and 10b, when the arc-extinguishing grid plate 1a01 of the transverse arc-extinguishing grid plate group 1a has long grid plate legs, the long grid plate legs extend into the gas generating component 5 near the moving contact, leaving no extra space inside the gas generating component. However, the arc-extinguishing grid plate 1b01 of the longitudinal arc-extinguishing grid plate group 1b has short grid plate legs, which occupy less space inside the gas generating component. The remaining space 5a can then be used to place the magnetizing part 7, which is generally an iron sheet. Of course, if the arc-extinguishing grid plate 1a01 in the transverse grid plate group 1a and the arc-extinguishing grid plate 1b01 in the longitudinal grid plate group 1b are both short grid plate legs or have no grid plate legs, then there will be space 5a on the gas generating component 5 corresponding to the positions in the transverse and / or longitudinal arc-extinguishing grid plate groups 1a and 1b, which can be used to place the magnetizing part 7. The magnetizing part 7 is placed on both sides of the area where the electric arc moves. It is completely surrounded by the gas generating part 5 in this area, which can increase the magnetic blowing force when the electric arc moves, so that the electric arc moves faster in this area and enters the grid cutting area more quickly, which is beneficial to enhancing the arc extinguishing ability.

[0046] As attached Figure 2a and 2b As shown, the side a1 of the arc-extinguishing chamber a located at the separation position of the moving contact 2 extends 4m beyond the edge of the corresponding side of the housing 4. The space formed between the side a1 of the arc-extinguishing chamber a located at the separation position of the moving contact 2 and one end of the corresponding arc-extinguishing grid assembly 1 constitutes the arc exhaust channel b. In this embodiment, as shown in the attached... Figure 6a and 6bAs shown, the arc-extinguishing grid plate 101 in the arc-extinguishing grid plate group 1 has an opening groove 101a on its outer side. The side a1 of the arc-extinguishing chamber a located at the separation position of the moving contact 2 forms an involute exhaust channel b with the opening groove 101a on the corresponding side of the arc-extinguishing grid plate group 1. Specifically, the opening groove 101a of the arc-extinguishing grid plate 1b01 in the longitudinal grid plate group 1b forms an involute exhaust channel b that gradually expands from the lower end to the upper end.

[0047] As shown in Figures 2, 8a, and 8b, the shape of the lower side of the intermediate partition 3 matches the closing motion trajectory of the moving contact 2. Figure 7a and 7b As shown, the middle portions of several moving contact pieces 201 in the moving contact 2 correspond to at least one intermediate partition plate 3 in the shape of grooves 201a, so that during the closing process of the moving contact 2, the lower side of the intermediate partition plate 3 can be located at the grooves 201a. For details, see attached... Figure 7a and 7b As shown, the middle portion of several moving contact pieces 201 in the moving contact 2 corresponds to at least one intermediate partition plate 3 and is shaped as a groove 201a. The short moving contact pieces 201 located at the bottom of the groove 201a have no arc contact, while the long moving contact pieces 201 located on both sides of the groove 201a have main contacts and arc contacts. Alternatively, the short moving contact pieces 201 are not provided at the bottom of the groove 201a, and are replaced by an insulating sheet matching the length of the short moving contact pieces 201. In this structure, the arc-initiating channel is divided by the intermediate partition plate to construct a double-cavity channel. First, the narrow slit effect results in strong air blowing; second, the double-cavity arc-initiating channel and the relatively wide grid cutting area form a Laval air passage, which accelerates the arc into the grid plate while effectively preventing the arc from retreating; third, the area of ​​the gas-generating material is relatively doubled, significantly increasing the air blowing force.

[0048] As attached Figure 8a and 8b As shown, a notch 301 is provided on the lower side of the intermediate partition 3. There can be one or more notches 301, used to allow gas flow between two different arc channels n, n'. When a pressure difference exists between the two arc channels n, n', gas from the arc channel with higher pressure can flow through the notch 301 to the arc channel with lower pressure, balancing the pressure inside the arc channels n, n' and preventing the intermediate partition 3 from tilting. Furthermore, at least one notch 301 is provided on the lower right side of the intermediate partition 3. The notch 301 is located between the moving and stationary contacts after the moving and stationary contacts have disconnected, which increases the creepage distance of the moving and stationary contacts after disconnection, thus improving withstand voltage. The notch 301 on the lower right side of the intermediate partition 3 can be filled with insulating materials such as nylon. For example, using melamine board for the intermediate partition 3 facilitates gas generation, and filling the notch 301 with nylon 66 increases insulation performance.

[0049] By extending the space in the direction of the mechanism, the arc-extinguishing chamber cavity is enlarged, forming an involute exhaust channel with the tail of the longitudinal arc-extinguishing grid group 1b. This facilitates smooth exhaust of the grid group, improves the grid utilization rate, and avoids the cost increase caused by increasing the depth dimension of the circuit breaker due to the exhaust channel. At the same time, by setting a slot in the middle of the tail of the arc-extinguishing grid, an additional exhaust channel is formed with the wall of the arc-extinguishing chamber cavity. This facilitates better entry of the arc into the arc-extinguishing grid, reduces the residence time at the arc-extinguishing grid inlet, and lowers the probability of "back-end breakdown" of the contacts and arc-extinguishing chamber.

[0050] This utility model provides an arc-extinguishing chamber structure, characterized in that it includes an arc-extinguishing grid assembly 1, which comprises a transverse arc-extinguishing grid assembly 1a and a longitudinal arc-extinguishing grid assembly 1b. One end of the transverse arc-extinguishing grid assembly 1a and one end of the longitudinal arc-extinguishing grid assembly 1b are connected. At least one intermediate partition 3 is arranged in the area between the separation position of the moving contact 2 and the stationary contact 6 and the inner side of the arc-extinguishing grid assembly 1 within the arc-extinguishing chamber a. The at least one intermediate partition 3 divides this area into at least two different arc channels n,n'. This modification to the entire arc-extinguishing chamber structure enhances the arc movement speed, thereby enhancing the arc-extinguishing capability of the arc-extinguishing chamber.

[0051] 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.

[0052] 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, characterized in that: It includes an arc-extinguishing grid assembly (1), which includes a transverse arc-extinguishing grid assembly (1a) and a longitudinal arc-extinguishing grid assembly (1b). One end of the transverse arc-extinguishing grid assembly (1a) and one end of the longitudinal arc-extinguishing grid assembly (1b) are connected. The side (a1) of the arc-extinguishing chamber (a) located at the separation position of the moving contact (2) extends 4m beyond the edge of the corresponding side shell (4). The space formed between the side (a1) of the arc-extinguishing chamber (a) located at the separation position of the moving contact (2) and one end of the corresponding arc-extinguishing grid assembly (1) constitutes an arc exhaust channel (b).

2. The arc-extinguishing chamber structure as described in claim 1, characterized in that: The arc-extinguishing chamber (a) has at least one intermediate partition plate (3) arranged in the area between the separation position of the moving contact (2) and the stationary contact (6) and the inner side of the arc-extinguishing grid plate group (1). The at least one intermediate partition plate (3) divides the area into at least two different arc channels (n, n'). The shape of the lower side of the at least one intermediate partition plate (3) matches the closing movement trajectory of the moving contact (2).

3. The arc-extinguishing chamber structure as described in claim 1, characterized in that: One end of the transverse arc-extinguishing grid plate group (1a) and one end of the longitudinal arc-extinguishing grid plate group (1b) are connected to form a structure. In this configuration, the transverse arc-extinguishing grid plate group (1a) is located above the longitudinal arc-extinguishing grid plate group (1b), and the upper end of the longitudinal arc-extinguishing grid plate group (1b) is connected to the end of the transverse arc-extinguishing grid plate group (1a) near the separation position of the moving contact (2).

4. The arc-extinguishing chamber structure as described in claim 3, characterized in that: The arc-extinguishing grid plate one (1a01) in the transverse arc-extinguishing grid plate group (1a) gradually changes from a vertical arrangement to an inclined arrangement as it moves from the end away from the separation position of the moving contact (2) to the end closer to the separation position of the moving contact (2), thereby connecting with the upper end of the longitudinal arc-extinguishing grid plate group (1b).

5. The arc-extinguishing chamber structure as described in claim 1, characterized in that: The gas generating component (5) is inserted into the arc extinguishing grid plate group (1) inside the arc extinguishing grid plate. There is a space (5a) on the gas generating component (5) corresponding to the transverse arc extinguishing grid plate group (1a) and / or the longitudinal arc extinguishing grid plate group (1b) for placing the magnetizing part (7).

6. The arc-extinguishing chamber structure as described in claim 2, characterized in that: A notch (301) is provided on the lower side of the intermediate partition (3).

7. The arc-extinguishing chamber structure as described in claim 6, characterized in that: At least one notch (301) is located on the right side of the lower part of the middle partition (3).

8. The arc-extinguishing chamber structure as described in claim 7, characterized in that: The middle portion of several moving contact pieces (201) in the moving contact (2) is in the shape of a groove (201a) corresponding to at least one intermediate partition plate (3), so that during the closing process of the moving contact (2), the lower side of at least one intermediate partition plate (3) can be located at the groove (201a).

9. The arc-extinguishing chamber structure as described in claim 1, characterized in that: An opening groove (101) is provided on the outer side of the arc extinguishing grid plate in the arc extinguishing grid plate group (1). The arc extinguishing chamber (a) is located on one side (a1) of the moving contact (2) at the separation position, and forms an opening exhaust channel (b) with the opening groove (101) on one side of the corresponding arc extinguishing grid plate group (1).

10. The arc-extinguishing chamber structure as described in claim 7, characterized in that: The notch (301) on the lower right side of the middle partition (3) is filled with insulating material.

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