High-voltage arc extinguishing chamber

Abstract

In order to solve the problems that the installation efficiency of an existing arc extinguishing cover is limited, and assembly, maintenance and replacement are inconvenient, the high-voltage arc extinguishing cover comprises two flash barriers, two grid piece covers and a grid piece set fixed between the two flash barriers, and the grid piece set comprises a plurality of arc extinguishing grid pieces arranged in sequence. The arc extinguishing grid sheet comprises an arc extinguishing plate and mounting end plates extending from the two ends of the arc extinguishing plate to the same side, and an area enclosed by the arc extinguishing plate and the mounting end plates is a moving area for the moving contact to pass through in a rotating manner; the flash barriers are in one-to-one correspondence with the grid covers; a mounting groove is formed in the edge of the flash barrier; the grid sheet cover is inserted into the mounting groove and is clamped with the mounting groove; a positioning groove is formed in the side, facing the interior of the arc extinguishing cover, of the grid piece cover, the installation end plate is inserted into the positioning groove, the two side faces, parallel to the flash barrier, of the installation end plate abut against the groove wall of the inserted positioning groove, installation of the grid piece cover is easy and convenient, the stability of installation and fixation is good, and therefore the assembling efficiency of the arc extinguishing cover and the convenience of maintenance and replacement are improved.

Description

Technical Field

[0001] This application relates to high-voltage circuit breakers, and in particular to an arc extinguishing cover for high voltage. Background Art

[0002] The arc extinguishing cover for high voltage is a component used in high-voltage molded case circuit breakers to extinguish the arc between the moving contact and the static contact in the circuit breaker. For example, the Chinese utility model patent CN2743961Y with an application date of November 30, 2005 discloses an arc extinguishing device for a breaker. The arc extinguishing device includes a left arc separating side wall and a right arc separating side wall, and arc extinguishing grid plates arranged in sequence are fixed between the left arc separating side wall and the right arc separating side wall. When the moving contact and the static contact are disconnected, an arc is induced between the arc separating plates, which extends and weakens the arc energy to achieve the arc extinguishing effect.

[0003] In addition, in CN2743961Y, a pair of shielding parts are also installed on the inner sides of the left arc separating side wall and the right arc separating side wall. The shielding parts are closely attached to the inner linings of the left arc separating side wall and the right arc separating side wall and cover the ends of the arc extinguishing grid plates to block the back breakdown phenomenon of the arc between the arc extinguishing grid plates and the moving contact.

[0004] During the actual production process, due to the small space of the arc extinguishing cover and the high requirement for the fixing stability of components, the shielding parts are fixed by hot riveting through the riveting posts penetrating the left arc separating side wall or the right arc separating side wall. Therefore, the installation efficiency of the arc extinguishing cover is restricted and the assembly, maintenance, and replacement are inconvenient. Utility Model Content

[0005] To solve the problems that the installation efficiency of the existing arc extinguishing cover is restricted and the assembly, maintenance, and replacement are inconvenient, an arc extinguishing cover for high voltage is provided.

[0006] The above-mentioned invention object of the present utility model is achieved through the following technical solutions:

[0007] An arc extinguishing cover for high voltage, including two arc separating plates, two grid plate covers, and a grid plate group fixed between the two arc separating plates. The grid plate group includes a plurality of arc extinguishing grid plates arranged in sequence. The arc extinguishing grid plate includes an arc extinguishing plate and mounting end plates extending from both ends of the arc extinguishing plate to the same side. The area surrounded by the arc extinguishing plate and the mounting end plates is an activity area for the moving contact to rotate through;

[0008] The arc separating plates and the grid plate covers correspond one by one;

[0009] An installation groove is formed at the edge of the arc separating plate, and the grid plate cover is inserted into the installation groove and is snap-connected with the installation groove;

[0010] A positioning groove is formed on the side of the grid plate cover facing the inside of the arc extinguishing cover. The mounting end plate is inserted into the positioning groove, and both side surfaces of the mounting end plate parallel to the arc separating plate are in contact with the groove walls of the inserted positioning groove.

[0011] By adopting the above technical solution, in the present application, the grid cover plays a role in blocking the back breakdown phenomenon of the arc between the arc extinguishing grid and the moving contact. When the grid cover is installed, it is retracted into the installation groove and clamped with the installation groove. At the same time, the installation end plate is inserted into the positioning groove to form further limitation, making the installation of the grid cover simple and convenient and the installation stability good. Thereby, the assembly efficiency of the arc extinguishing cover and the convenience of maintenance and replacement are improved.

[0012] Optionally: The installation groove includes two limiting groove walls adjacent to the groove opening, and the limiting groove walls are attached to the end face of the grid cover.

[0013] One end of the grid cover protrudes with a limiting clamping block, and one of the limiting groove walls is provided with a limiting clamping groove for the limiting clamping block to be clamped. The included angle between the insertion direction of the limiting clamping block in the limiting clamping groove and the limiting groove wall is α, and α is less than 90°.

[0014] By adopting the above technical solution, when the grid cover is slightly vibrated and shaken, the included angle between the direction of the abutting force between the limiting groove wall and the end plate of the grid cover and the direction of the limiting clamping block coming out is less than 90°, making the limiting clamping block less likely to come out and improving the installation stability of the grid cover.

[0015] Optionally: A spacer plate inserted between the arc extinguishing grids is fixed in the positioning groove.

[0016] Through the above technical solution, the insulation between the arc extinguishing grids is further improved, and the arc extinguishing effect is enhanced.

[0017] Optionally: The arc extinguishing grid arranged on the outermost side in the grid group is an arc ignition grid. The arc ignition grid extends an arc ignition plate from the arc extinguishing plate into the active area, and the end of the arc ignition plate is inclined towards the outside of the grid group.

[0018] Through the above technical solution, according to the installation position, the two arc ignition grids are divided into a static arc ignition piece close to the static contact and a moving arc ignition piece close to the moving contact at the time of disconnection. The static arc ignition piece can more effectively introduce the arc on the static contact into the grid group through the arc ignition plate. The arc ignition plate of the moving arc ignition piece increases the extension distance of the grid group outwards. While ensuring that the arc is introduced between the moving contact and the grid group, the distance between the moving contact and the static contact at the time of disconnection is increased, enhancing the breaking performance of the circuit breaker.

[0019] Optionally: There are multiple arc extinguishing grids in the grid group as intermediate grids. The intermediate grids are arranged adjacent to each other. The arc ignition plate of the intermediate grid is recessed with an arc receiving groove on one side of the active area. The deepest part of the arc receiving groove is the arc receiving point. The arc receiving points between the adjacent arranged intermediate grids are staggered along the arrangement direction.

[0020] Through the above technical solution, when the arc jumps between the middle grid plates, the landing point is the arc-receiving point, which increases the arc length, increases the energy required for arc breakdown initiation, and enhances the arc extinguishing ability of the arc extinguishing cover.

[0021] Optionally: Among the grid plate groups, the arc extinguishing grid plates further include strengthening grid plates. The arrangement area of the strengthening grid plates is adjacent to the arrangement area of the middle grid plates. The arc extinguishing plate of the strengthening grid plate is recessed inward from one side of the movable area with an arc-igniting groove, and the depth of the arc-igniting groove is greater than the depth of the arc-receiving groove.

[0022] Through the above technical solution, when the energy of the breaking arc is relatively large, the arc is introduced deeper into the interior of the grid plate group, achieving a better arc extinguishing effect and improving the arc extinguishing performance of the arc extinguishing cover.

[0023] Optionally: When there are multiple strengthening grid plates, the strengthening grid plates are arranged adjacent to each other, and the arc-igniting grooves on the adjacent strengthening grid plates are offset along the arrangement direction.

[0024] Through the above technical solution, the arc length is increased, the energy required for arc breakdown initiation is increased, and the arc extinguishing ability of the arc extinguishing cover is enhanced.

[0025] Optionally: The bottom of the arc-igniting groove is an arc-shaped curved surface.

[0026] Through the above technical solution, the arc-igniting effect of the arc-igniting groove is better.

[0027] In summary, the present application at least has the following beneficial effects:

[0028] 1. The installation of the grid plate cover in the arc extinguishing cover of the present application is simple and convenient, and the installation and fixation stability is good, thereby improving the assembly efficiency of the arc extinguishing cover and the convenience of maintenance and replacement;

[0029] 2. The arrangement of the arc extinguishing grid plates in the arc extinguishing cover of the present application and the functions brought by the special structure improve the arc extinguishing performance of the arc extinguishing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the arc extinguishing cover;

[0031] Figure 2 It is a schematic structural diagram of the grid plate group in the assembled state;

[0032] Figure 3 It is an exploded schematic diagram of the grid plate group exploded along the arrangement direction;

[0033] Figure 4 It is a schematic diagram of the positional relationship among the grid plate group, the static contact, and the moving contact when the circuit breaker section is disconnected after the arc extinguishing cover is installed;

[0034] Figure 5 It is a schematic structural diagram of the arc-igniting grid plate;

[0035] Figure 6 It is a schematic structural diagram of the middle grid sheet;

[0036] Figure 7 It is a schematic structural diagram of the strengthened grid sheet;

[0037] Figure 8 It is an exploded schematic diagram of the grid sheet cover assembly Figure 1 ;

[0038] Figure 9 It is a cross-sectional view of the arc extinguishing cover;

[0039] Figure 10 It is an exploded schematic diagram of the grid sheet cover assembly Figure 2 .

[0040] Reference numerals: 1, arc separating plate; 11, installation slot; 12, installation groove; 121, limiting groove wall; 1211, limiting card slot; 2, grid sheet group; 21, arc extinguishing grid sheet; 21a, arcing grid sheet; 21b, middle grid sheet; 21c, strengthened grid sheet; 211, arc extinguishing plate; 212, installation end plate; 2121, installation block; 213, active area; 214, arcing plate; 215, arc receiving groove; 2151, arc receiving point; 216, arcing groove; 3, grid sheet cover; 31, positioning groove; 32, spacer plate; 33, limiting block; 4, moving contact; 5, static contact. Detailed implementation manners

[0041] The following further describes the present application in detail with reference to the accompanying drawings.

[0042] Embodiment 1

[0043] As shown in the attached Figure 1 figures, an arc extinguishing cover for high-voltage electricity includes two arc separating plates 1 and a grid sheet group 2 located between the arc separating plates 1.

[0044] As shown in the attached Figure 2 figures, the grid sheet group 2 is composed of a plurality of arc extinguishing grid sheets 21 arranged at intervals in one direction, and its arrangement direction is generally the length direction of the arc separating plate 1. The number of arc extinguishing grid sheets 21 is determined according to the voltage requirement of the applied circuit breaker. In this embodiment, the total number of arc extinguishing grid sheets 21 is 21.

[0045] The arc extinguishing grid sheets 21 have a common basic structure, and at the same time have different differential structures and arrangement positions according to their functions.

[0046] As shown in the attached Figure 3 figures, each arc extinguishing grid sheet 21 includes an arc extinguishing plate 211 and installation end plates 212 located at both ends of the arc extinguishing plate 211. The two installation end plates 212 are located on the same side of the arc extinguishing plate 211, and they extend from the arc extinguishing plate 211, and the extension direction is parallel to the arc separating plate 1 and perpendicular to the arc extinguishing plate 211.

[0047] The area enclosed by the two mounting end plates 212 and the arc extinguishing plate 211 is the active area 213, and all the active areas 213 in the grid group 2 are connected and combined. On the side of the mounting end plate 212 facing away from the active area 213, a prismatic mounting block 2121 is formed by convexity.

[0048] As shown in the appendix Figure 1 and the appendix Figure 3 As shown, corresponding mounting slots 11 are opened on the arc separating plate 1. The mounting block 2121 is inserted and clamped in the mounting slot 11, so that the arc extinguishing grid 21 is fixed to the arc separating plate 1 and positions the fixed angle of the arc extinguishing grid 21 between the two arc separating plates 1.

[0049] As shown in the appendix Figure 3 As shown, the arc extinguishing grid 21 is divided into an arc initiating grid 21a, an intermediate grid 21b and a strengthening grid 21c according to functions. The arc initiating grids 21a are arranged at both ends of the grid group 2, and the intermediate grids 21b and the strengthening grids 21c are arranged between the two arc initiating grids 21a.

[0050] As shown in the appendix Figure 4 As shown, after the arc extinguishing cover is installed, the active area 213 of the grid group 2 provides an active space for the rotation of the moving contact 4. The positions of the two arc initiating grids 21a and the static contact 5 are divided into a static arc initiating piece closer to the static contact 5 and a moving arc initiating piece farther from the static contact 5.

[0051] As shown in the appendix Figure 4 and the appendix Figure 5 As shown, the different structure of the arc initiating grid 21a is the arc initiating plate 214. The arc initiating plate 214 is formed by the arc extinguishing plate 211 extending into the active area 213, and the end of the arc initiating plate 214 is inclined outward towards the outside of the grid group 2.

[0052] In the state where the arc extinguishing cover is installed, the inclination direction of the end of the arc initiating plate 214 of the static arc initiating piece corresponds to the position of the static contact 5, and the inclination direction of the end of the arc initiating plate 214 of the moving arc initiating piece corresponds to the position of the moving contact 4 when the circuit breaker is opened. When the circuit breaker is opened, the static arc initiating piece can more effectively introduce the arc on the static contact 5 into the grid group 2 from the arc initiating plate 214. The arc initiating plate 214 of the moving arc initiating piece increases the extension distance of the grid group 2 outward. When ensuring that the arc is introduced between the moving contact 4 and the grid group 2, the distance between the moving contact 4 and the static contact 5 when opened is increased, enhancing the insulation performance of the circuit breaker.

[0053] As shown in the appendix Figure 3 As shown, the number of the intermediate grids 21b is multiple, and the intermediate grids 21b are concentratedly arranged, here there are sixteen pieces.

[0054] As shown in the appendix Figure 6As shown, the differential structure of the middle grid piece 21b is the arc receiving groove 215. The arc receiving groove 215 is formed by the inward depression on the side of the arc extinguishing plate 211 close to the active area 213. The arc receiving groove 215 penetrates the middle grid piece 21b along the arrangement direction. The shape of the arc receiving groove 215 can be determined according to the actual design requirements. Here, the arc receiving groove 215 is an inclined V-shaped groove, and the deepest part of the depression of the arc receiving groove 215 is exactly the tip of the V shape, which is denoted as the arc receiving point 2151 here.

[0055] For two adjacent middle grid pieces 21b, due to the change in the inclined position or shape of the arc receiving groove 215, the positions of the arc receiving points 2151 alternate along the arrangement direction. Thus, according to the potential difference, when the arc jumps between the middle grid pieces 21b, the landing point is the arc receiving point 2151, which increases the arc length, increases the energy required for arc breakdown initiation, and enhances the arc extinguishing ability of the arc extinguishing cover.

[0056] As shown in the attachment Figure 7 As shown, the number of the strengthening grid pieces 21c is increased according to the voltage situation. The greater the voltage, the more the number of the strengthening grid pieces 21c. In this embodiment, the number of the strengthening grid pieces 21c is three.

[0057] The strengthening grid pieces 21c are also arranged in a concentrated manner, and the arrangement position is between the middle grid piece 21b and the static arc initiating piece.

[0058] The differential structure of the strengthening grid piece 21c lies in that there is a smooth transition between the arc extinguishing plate 211 and the mounting end plate 212, and an arc initiating groove 216 is provided on the arc extinguishing plate 211. The arc initiating groove 216 is formed by the inward depression of the arc extinguishing plate 211 from the side of the active area 213, and it penetrates the strengthening grid piece 21c along the arrangement direction.

[0059] The arc initiating groove 216 is strip-shaped, the bottom of the groove is an arc-shaped curved surface, and at the same time, the depth of the arc initiating groove 216 is greater than the depth of the arc receiving groove 215.

[0060] As shown in the attachment Figure 4 and the attachment Figure 7 As shown, after the arc contacts the static arc initiating piece, the arc lands on the bottom of the arc initiating groove 216, and when the arc energy is large, it is introduced deeper into the inside of the grid piece group 2, achieving a better arc extinguishing effect.

[0061] As shown in the attachment Figure 7 As shown, in addition, the positions of the arc initiating grooves 216 on adjacent strengthening grid pieces 21c are different, and the arc landing points on the strengthening grid pieces 21c are staggered along the arrangement direction.

[0062] As shown in the attachment Figure 8 As shown, the arc extinguishing cover further includes two grid piece covers 3. The grid piece covers 3 are strip-shaped, and a positioning groove 31 for inserting the mounting end plate 212 of the arc extinguishing grid piece 21 is opened on one side surface thereof.

[0063] As shown in the attachment Figure 9As shown, the width of the positioning groove 31 is equal to the width of the mounting end plate 212. That is, when two grid cover 3s are respectively sleeved on two groups of mounting end plates 212 of the grid group 2, both sides of each mounting end plate 212 are in close contact with the groove walls of the positioning groove 31.

[0064] As shown in the appendix Figure 8 and the appendix Figure 9 As shown, there is also a spacer plate 32 in the positioning groove 31. After the grid cover 3s are respectively sleeved on two groups of mounting end plates 212 of the grid group 2, the spacer plate 32 is inserted between the arc extinguishing grids 21, playing a role in strengthening the insulation performance between the arc extinguishing grids 21.

[0065] As shown in the appendix Figure 10 As shown, in addition, the two end faces of the grid cover 3 are parallel to each other and form an angle with the length direction of the grid cover 3 itself. The angle size is α, where α is greater than 0° and less than 90°, and here α is 45°. One end edge of the grid cover 3 also extends to form a limit clamping block 33, and the extending direction of the limit clamping block 33 is parallel to the overall length direction of the grid cover 3.

[0066] As shown in the appendix Figure 9 and the appendix Figure 10 As shown, on the side of the arc separating plate 1 close to the active area 213, an installation groove 12 is formed at its edge. The installation groove 12 penetrates through the edge of the arc separating plate 1 along the direction perpendicular to the side face of the arc separating plate 1, and the notch of the installation groove 12 is located on the long side edge of the arc separating plate 1.

[0067] The bottom of the installation groove 12 is parallel to the length direction of the arc separating plate 1, and the dimension of the bottom of the installation groove 12 along the length direction of the arc separating plate 1 is equal to the length of the grid cover 3.

[0068] The two side groove walls of the installation groove 12 are limit groove walls 121. The limit groove walls 121 connect the bottom and the notch of the installation groove 12. The two limit groove walls 121 are parallel to each other, and the limit groove walls 121 are inclined with respect to the bottom of the installation groove 12, and the angle size is also α. At the same time, a limit groove 1211 that fits with the limit clamping block 33 is recessed on one of the limit groove walls 121. Here, the limit groove 1211 is located on the limit groove wall 121 close to the static arc ignition piece.

[0069] Therefore, when the grid cover 3 is embedded in the installation groove 12, the side of the grid cover 3 with the positioning groove 31 is in close contact with the bottom of the installation groove 12, both ends of the grid cover 3 are in close contact with the limit groove walls 121 respectively, and the limit clamping block 33 is clamped and fixed with the limit groove 1211.

[0070] In this embodiment, the method for assembling the arc extinguishing cover of the present application:

[0071] First, an arc extinguishing grid piece 21 is inserted and installed between two spaced arc plates 1 to form a grid piece group 2. Then, the side of the grid piece groove with a positioning groove 31 is aligned with the mounting end plate 212. Next, the grid piece cover 3 is pushed into the mounting groove 12 from the notch of the mounting groove 12. While the positioning groove 31 gradually covers the outside of the mounting end plate 212, the grid piece cover 3 gradually slides into the mounting groove 12 along the limiting groove wall 121 until the grid piece cover 3 fits against the bottom of the mounting groove 12. At this time, the limiting block 33 also just snaps into the limiting card slot 1211, thus realizing the assembly. The installation of the grid piece cover 3 is simple and convenient.

[0072] In the assembled arc extinguishing cover, the grid piece cover 3 plays a role in blocking the back breakdown phenomenon of the arc between the arc extinguishing grid piece 21 and the moving contact 4. The grid piece cover 3 realizes its positioning in six directions of front-back, left-right, up-down in space through the clamping connection between the limiting card slot 1211 and the limiting block 33, the abutment of the end part against the limiting groove wall 121, and the abutment of the positioning groove 31 against the mounting end plate 212, preventing the shaking and falling off of the grid piece cover 3. The installation and fixation stability of the grid piece cover 3 is good.

[0073] Thereby, the assembly efficiency of the arc extinguishing cover and the convenience of maintenance and replacement are improved.

[0074] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope required to be protected by the present invention, it is protected by the Patent Law.

Claims

1. An arc extinguishing cover for high voltage electricity, comprising two arc separating plates (1), two grid sheet covers (3), and a grid sheet group (2) fixed between the two arc separating plates (1). The grid sheet group (2) includes a plurality of arc extinguishing grid sheets (21) arranged in sequence. The arc extinguishing grid sheet (21) includes an arc extinguishing plate (211) and mounting end plates (212) extending from both ends of the arc extinguishing plate (211) to the same side. The area enclosed by the arc extinguishing plate (211) and the mounting end plates (212) is an activity area (213) for the moving contact (4) to rotate through. It is characterized in that: The arc separating plates (1) and the grid sheet covers (3) are in one-to-one correspondence. An installation groove (12) is formed at the edge of the arc separating plate (1), and the grid sheet cover (3) is inserted into the installation groove (12) and is snap-connected with the installation groove (12). A positioning groove (31) is formed on the side of the grid sheet cover (3) facing the inside of the arc extinguishing cover. The mounting end plate (212) is inserted into the positioning groove (31), and both sides of the mounting end plate (212) parallel to the arc separating plate (1) are in contact with the groove walls of the inserted positioning groove (31).

2. The arc extinguishing cover for high voltage electricity according to claim 1, wherein: The installation groove (12) includes two limiting groove walls (121) adjacent to the groove opening. The limiting groove walls (121) are in contact with the end face of the grid sheet cover (3). One end of the grid sheet cover (3) protrudes with a limiting block (33). One of the limiting groove walls (121) is provided with a limiting groove (1211) for the limiting block (33) to be snap-connected. The insertion direction of the limiting block (33) in the limiting groove (1211) and the limiting groove wall (121) form an angle α, and α is less than 90°.

3. The arc extinguishing cover for high voltage electricity according to claim 1, characterized in that: A spacer plate (32) inserted between the arc extinguishing grid sheets (21) is fixed in the positioning groove (31).

4. An arc extinguishing cover for high voltage electricity according to claim 1, characterized in that: The outermost arc extinguishing grid sheet (21) arranged in the grid sheet group (2) is an arc leading grid sheet (21a). The arc leading grid sheet (21a) extends an arc leading plate (214) into the activity area (213) from the arc extinguishing plate (211), and the end of the arc leading plate (214) inclines towards the outside of the grid sheet group (2).

5. The arc extinguishing cover for high voltage electricity according to claim 1, characterized in that: Among the arc extinguishing grid sheets (21) in the grid sheet group (2), there are a plurality of intermediate grid sheets (21b). The intermediate grid sheets (21b) are arranged adjacent to each other. An arc receiving groove (215) is recessed on one side of the arc leading plate (214) of the intermediate grid sheet (21b) in the activity area (213). The deepest part of the recessed arc receiving groove (215) is an arc receiving point (2151). The arc receiving points (2151) between the adjacent intermediate grid sheets (21b) arranged adjacent to each other are staggered along the arrangement direction.

6. The arc extinguishing cover for high voltage electricity according to claim 5, characterized in that: Among the arc extinguishing grid sheets (21) in the grid sheet group (2), there are also strengthening grid sheets (21c). The arrangement area of the strengthening grid sheets (21c) is adjacent to the arrangement area of the intermediate grid sheets (21b). The arc extinguishing plate (211) of the strengthening grid sheet (21c) is recessed with an arc leading groove (216) from one side of the activity area (213) inwards. The depth of the recessed arc leading groove (216) is greater than the depth of the recessed arc receiving groove (215).

7. The arc extinguishing cover for high voltage electricity according to claim 6, characterized in that: When there are a plurality of the strengthening grid sheets (21c), the strengthening grid sheets (21c) are arranged adjacent to each other, and the arc leading grooves (216) on the adjacent strengthening grid sheets (21c) are offset along the arrangement direction.

8. An arc extinguishing cover for high voltage electricity according to claim 6, characterized in that: The bottom of the arc starting groove (216) is an arc-shaped curved surface.

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