Arc extinguish chamber

Abstract

An arc extinguish chamber is characterized in that the arc extinguish chamber (4) comprises an arc extinguish grid sheet group (401), and two side ends of the arc extinguish grid sheet group (401) are fixed on insulating parts (402, 403). The arc extinguishing grid plate group (401) is arranged on the insulating parts (402 and 402 '), the middle insulator (403) is arranged between the insulating parts (402 and 402') and forms narrow slit channels (a and a ') with the insulating parts (402 and 402'), and after entering the arc extinguishing chamber (4), an arc is cut by the arc extinguishing grid plate group (401) and is stretched by the narrow slit channels (a and a ') at the same time, so that the extinguishing of the arc is accelerated. The middle insulator is arranged in the middle of the arc extinguish chamber, namely in the middle of the moving contact pieces, the middle insulator and the gas generating pieces on the two sides form a narrow slit area, arc extinguish can be achieved through narrow slits under small current, electric arcs can be promoted to move towards the arc extinguish chamber located in front of the contacts, and the phenomenon of electric arc breakdown between the two moving contacts and the grid pieces is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and specifically relates to an arc extinguishing chamber. Background Art

[0002] In the existing low-voltage electrical field, the voltage that DC switches can withstand can only reach DC1500V. According to the latest development needs of the low-voltage electrical industry, the current and voltage that DC switches need to withstand will develop to AC2000V and DC3000V. Among isolating switches, the current products can only reach DC750V for single pole and DC1500V for two poles. The products of various companies cannot meet the standard requirements of DC2000V and DC2500V. The reason is that when the existing isolating switches use grid arc extinguishing chambers, the arc cannot be extinguished at the critical low current, and there will also be arc breakdown between the two moving contacts and the middle slot of the grid.

[0003] Chinese patent 202320784781.2 discloses a contact arc extinguishing system, including a contact system and an arc extinguishing chamber, wherein the contact system includes a moving contact and a stationary contact, wherein the moving contact includes moving contact pieces arranged side by side, and the arc extinguishing chamber includes a plurality of grid pieces arranged in an array, wherein at least two notches are provided on the grid pieces, each notch is used for a moving contact piece to be inserted, and flanges extending toward the moving contact piece are formed on both sides of each notch, and a gas-generating part is wrapped on the head of the flange. The arc extinguishing system can accelerate the arc to enter the grid pieces of the array, shorten the arc extinguishing time of the grid pieces, and improve the efficiency of the grid pieces in extinguishing the arc; however, when applied to the isolating switch, the arc is still difficult to extinguish when the critical current is small. Utility Model Content

[0004] The purpose of the utility model is to provide an arc extinguishing chamber in order to solve the problem that the arc cannot be extinguished at a critical low current when the arc extinguishing chamber is used in the above-mentioned existing isolating switches, and at the same time, there will be an arc breakdown between the two moving contacts and the middle slot of the grid. An intermediate insulator is arranged in the middle of the arc extinguishing chamber, and the intermediate insulator and the gas-producing parts on both sides form a narrow gap area. The arc can be extinguished by the narrow gap under a low current, and the arc can be urged to move toward the arc extinguishing chamber located in front of the contact, thereby avoiding the arc breakdown between the two moving contacts and the middle leg of the grid.

[0005] Technical Solution

[0006] In order to achieve the above technical objectives, the utility model provides an arc extinguishing chamber, characterized in that: the arc extinguishing chamber includes an arc extinguishing grid group, the two side ends of the arc extinguishing grid group are fixed on the insulating parts, and the intermediate insulator is placed between the insulating parts to form a narrow slit channel with the insulating parts. After the arc enters the arc extinguishing chamber, it is cut by the arc extinguishing grid group and stretched by the narrow slit channel to accelerate the extinction of the arc.

[0007] In one embodiment, the insulating member includes an insulating partition for fixing the arc-extinguishing grid group and a gas-generating member forming a narrow slit channel with the intermediate insulator;

[0008] The insulating partition and the gas generating component are assembled and fixed together or are integrated.

[0009] In one embodiment, a magnetizing block is mounted on the intermediate insulator to increase the magnetic blowing effect.

[0010] In one embodiment, the arc extinguishing grid group includes arc extinguishing grid one, arc extinguishing grid two and arc extinguishing grid three, and the arc extinguishing grid one, arc extinguishing grid two and arc extinguishing grid three are vertically placed in the arc extinguishing chamber;

[0011] The arc extinguishing grid piece 1 is located at the outermost side away from the rotation direction of the moving contact, the arc extinguishing grid piece 1 is provided with a bending portion extending toward the side close to the moving contact, and the arc extinguishing grid piece 1 is provided with a mounting notch at a position corresponding to the intermediate insulator;

[0012] The second arc-extinguishing grid is located on the side of the first arc-extinguishing grid facing the moving contact end, and the second arc-extinguishing grid is provided with a first notch;

[0013] A plurality of arc extinguishing grids three are located on the side of the arc extinguishing grid two facing the moving contact end, the arc extinguishing grid three is provided with a notch two, and a protrusion is provided on the notch two corresponding to the middle insulator.

[0014] In one embodiment, the intermediate insulator includes at least one insulating plate, and a mounting hole matching with the protrusion is provided on the outer edge of the insulating plate.

[0015] In one embodiment, the intermediate insulator includes at least one insulating plate, and a protrusion that matches the installation notch is provided at one end of the outer edge of the insulating plate.

[0016] In one embodiment, the intermediate insulator includes at least one insulating plate, and two ends of the insulating plate are respectively provided with a first mounting protrusion and a second mounting protrusion for mounting in cooperation with the shell.

[0017] In one embodiment, the intermediate insulator includes at least one insulating plate, and the insulating plate includes an insulating plate 1 and an insulating plate 2, and the insulating plate 1 and the insulating plate 2 are integrally formed or spliced ​​together.

[0018] In one embodiment, the contact portion of the moving contact extends into the first slot and the second slot in the arc extinguishing grid group during the rotation process.

[0019] In one embodiment, the arc extinguishing chamber is arc-shaped.

[0020] Beneficial Effects

[0021] The utility model provides an arc extinguishing chamber, characterized in that: the arc extinguishing chamber includes an arc extinguishing grid group, the two side ends of the arc extinguishing grid group are fixed on the insulating member, the middle insulator is placed between the insulating member to form a narrow slit channel with the insulating member, and the arc is cut by the arc extinguishing grid group and stretched by the narrow slit channel after entering the arc extinguishing chamber, thereby accelerating the extinguishing of the arc. The middle insulator is arranged in the middle of the arc extinguishing chamber, and the middle insulator and the gas generating members on both sides form a narrow slit area, which can also achieve arc extinguishing under low current by relying on the narrow slit, and can also promote the arc to move toward the arc extinguishing chamber in front of the contact, thereby avoiding the arc breakdown phenomenon between the two moving contacts and the middle leg of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Attached Figure 1 This is a schematic diagram of the structure of the isolating switch in Embodiment 1 of the present utility model;

[0024] Attached Figure 2 This is a schematic diagram of the installation of the intermediate insulator in Embodiment 1 of the present utility model;

[0025] Attached Figure 3 This is a schematic diagram of the intermediate insulator product in Example 1 of the utility model. Figure 1 ;

[0026] Attached Figure 4 This is a schematic diagram of the intermediate insulator product in Example 1 of the utility model. Figure 2 ;

[0027] Attached Figure 5 This is a schematic diagram of a magnetic enhancement block product in Embodiment 1 of the present utility model;

[0028] Attached Figure 6 This is a schematic diagram of the narrow slit channel in Example 1 of the utility model;

[0029] Attached Figure 7 This is a schematic diagram of assembling the insulating parts on both sides in Embodiment 1 of the utility model;

[0030] Attached Figure 8 It is a schematic diagram of the decomposition of the insulating parts on both sides in Embodiment 1 of the utility model;

[0031] Attached Fig. 9 This is a schematic diagram of the relationship between the insulating partition and the gas generating member in Example 1 of the utility model;

[0032] Attached Fig.10 This is a schematic diagram of the structure of the isolating switch in Embodiment 2 of the present utility model;

[0033] Attached Fig.11 This is a schematic diagram of the installation of the intermediate insulator in Embodiment 2 of the present utility model;

[0034] Attached Fig.12 This is a schematic diagram of the installation of the intermediate insulator and the arc-extinguishing grid in Embodiment 2 of the present utility model; DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0040] Example 1

[0041] When the existing disconnector uses a grid arc extinguishing chamber, it cannot be extinguished at a critical low current. In order to solve this problem, as shown in the attached Figure 1 and 2 As shown, this embodiment provides an arc extinguishing chamber, which is applied to a disconnector, the disconnector includes a housing 1, a moving contact 2 and a stationary contact 3, the moving contact 2 is installed in a moving contact mounting groove 101 on the housing 1, the stationary contact 3 is installed in a stationary contact mounting groove 102 on the housing 1 and is located on the outside of the moving contact 2, the moving contact 2 can rotate around its own central axis, and the moving contact 2 can engage with or disengage from the stationary contact 3 during the rotation around its own central axis, and an arc extinguishing chamber 4 is provided on the housing 1 outside the rotation trajectory of the moving contact 2 around its own central axis. In this embodiment, the arc extinguishing chamber 4 is arc-shaped. As shown in the attached figure Figure 6 As shown, the arc extinguishing chamber 4 includes an arc extinguishing grid group 401, and the two side ends of the arc extinguishing grid group 401 are fixed on insulating members 402, 402'. The intermediate insulator 403 is placed between the insulating members 402, 402' to form narrow slit channels a, a' with the insulating members 402, 402'. After the arc enters the arc extinguishing chamber 4, it is cut by the arc extinguishing grid group 401 and stretched by the narrow slit channels a, a', thereby accelerating the extinction of the arc.

[0042] Among them, as attached Figure 7 , 8 and 9, the insulating parts 402, 402' include insulating partitions 402a, 402a' for fixing the arc extinguishing grid group 401 and gas producing parts 404, 404' forming narrow slit channels a, a' with the intermediate insulator 403; the insulating partitions 402a, 402a' and the gas producing parts 404, 404' are assembled and fixed together or are in an integrated form. In this embodiment, the insulating partitions 402a, 402a' and the gas producing parts 404, 404' are assembled and fixed together through shaft holes. The gas producing parts 404, 404' are sleeved on the legs of the arc extinguishing grid group 401.

[0043] The arc extinguishing grid group 401 includes an arc extinguishing grid 1 401a, an arc extinguishing grid 2 401b and an arc extinguishing grid 3 401c. Figure 1 and 2As shown, the arc extinguishing grid piece 1 401a, the arc extinguishing grid piece 2 401b and the arc extinguishing grid piece 3 401c are placed in the arc extinguishing chamber 4 in a vertical state;

[0044] The arc extinguishing grid piece 1 401a is located at the outermost side away from the rotation direction of the moving contact 2, and the arc extinguishing grid piece 1 401a is provided with a bending portion 401a01 extending toward the side close to the moving contact 2. The arc extinguishing grid piece 2 401b is located at the side of the arc extinguishing grid piece 1 401a facing the end of the moving contact 2, and the arc extinguishing grid piece 2 401b is provided with a notch 1 401b01;

[0045] A plurality of arc extinguishing grid pieces 3 401c are located on one side of the arc extinguishing grid piece 2 401b facing the end of the moving contact 2, and the arc extinguishing grid piece 3 401c is provided with a notch 2 401c01, and a protrusion 401c0101 is provided on the notch 2 401c01 at a position corresponding to the intermediate insulator 403. When the contact part 201 of the moving contact 2 is rotated, the contact part 201 of the moving contact 2 extends into the notch 1 401b01 and the notch 2 401c01 in the arc extinguishing grid piece group 401, which can facilitate the breaking of the arc and enter the arc extinguishing chamber 4.

[0046] As attached Figure 3 and 4 As shown, the intermediate insulator 403 includes at least one insulating plate 403a. In this embodiment, the outer edge of the insulating plate 403a is provided with a mounting hole 403a01 that matches the protrusion 401c0101. The protrusion 401c0101 is inserted into the mounting hole 403a01, and the intermediate insulator 403 is located between the moving contact piece 1 201 and the moving contact piece 2 202 of the moving contact. With this structure, the intermediate insulator 403 can be stably installed in the middle of the arc extinguishing chamber.

[0047] In this embodiment, the insulating plate 403a includes an insulating plate 1 403b and an insulating plate 2 403b', and the insulating plate 1 403b and the insulating plate 2 403b' are integrally formed or assembled. This structure is convenient for processing the intermediate insulator. Figure 5 As shown, a magnetizing block 5 is installed between the insulating plate 1 403b and the insulating plate 2 403b' to increase the magnetic blowing effect. The insulating members 402, 402' and the intermediate insulator 403 are made of gas-generating materials, which generate gas during the arc extinguishing process, and the gas blowing further accelerates the transfer of the arc to the arc extinguishing chamber.

[0048] Example 2

[0049] In this embodiment, as shown in attachments 10, 11 and 12, a mounting notch 401a02 is provided on the arc extinguishing grid piece 1 401a at a position corresponding to the intermediate insulator 403. The intermediate insulator 403 includes at least one insulating plate 403a, and a protrusion 403a02 is provided at one end of the outer edge of the insulating plate 403a to match the mounting notch 401a02. With this structure, the intermediate insulator 403 can be stably installed in the middle of the arc extinguishing chamber. Other structures and working principles are the same as those of embodiment 1.

[0050] Example 3

[0051] In this embodiment, the intermediate insulator 403 includes at least one insulating plate 403a, and the two ends of the insulating plate 403a are respectively provided with a mounting protrusion 1 403a03 and a mounting protrusion 2 403a04 that are mounted in cooperation with the housing 1. The mounting protrusion 1 403a03 and the mounting protrusion 2 403a04 are installed in the housing 1. With this structure, the intermediate insulator 403 can be stably installed in the middle of the arc extinguishing chamber. Other structures and working principles are the same as those of the first embodiment.

[0052] The utility model provides an arc extinguishing chamber, in which an intermediate insulator is arranged in the middle of the arc extinguishing chamber, that is, in the middle of the moving contact piece. The intermediate insulator and the gas producing parts on both sides form a narrow gap area. Arc extinguishing can be achieved by relying on the narrow gap under a small current, and the arc can be prompted to move toward the arc extinguishing chamber located in front of the contact, thereby avoiding the arc breakdown phenomenon between the two moving contacts and the middle leg of the grid piece.

[0053] It should be noted that this embodiment uses the arc extinguishing chamber for disconnecting switches as an illustration, but it does not mean that the arc extinguishing chamber provided by the utility model is only suitable for disconnecting switches. Any technical solution inspired by the present invention should be deemed to fall within the scope of protection of the claims of the utility model; in addition, in each embodiment of the utility model, the installation method of the intermediate insulator can be used alone, two at a time, or three at a time. Any installation method should be deemed to fall within the scope of protection of the claims of the utility model.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0055] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An arc extinguishing chamber, characterized in that: The arc extinguishing chamber (4) comprises an arc extinguishing grid group (401), both side ends of the arc extinguishing grid group (401) are fixed on insulating parts (402, 402'), an intermediate insulator (403) is arranged between the insulating parts (402, 402') and forms a narrow slit channel (a, a') with the insulating parts (402, 402'), and an electric arc is cut by the arc extinguishing grid group (401) and stretched by the narrow slit channel (a, a') after entering the arc extinguishing chamber (4), thereby accelerating the extinction of the electric arc.

2. An arc extinguishing chamber according to claim 1, characterized in that: The insulating member (402, 402') comprises an insulating partition (402a, 402a') for fixing and mounting the arc extinguishing grid plate group (401) and a gas generating member (404, 404') for forming a narrow slit channel (a, a') with the intermediate insulator (403); The insulating partition (402a, 402a') and the gas generating component (404, 404') are assembled and fixed together or are integrated.

3. An arc extinguishing chamber according to claim 1, characterized in that: The intermediate insulator (403) is provided with a magnetizing block (5) to increase the magnetic blowing effect.

4. An arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing grid group (401) comprises arc extinguishing grid one (401a), arc extinguishing grid two (401b) and arc extinguishing grid three (401c), and the arc extinguishing grid one (401a), arc extinguishing grid two (401b) and arc extinguishing grid three (401c) are placed in an arc extinguishing chamber (4) in a vertical state; The arc extinguishing grid piece 1 (401a) is located at the outermost side away from the rotation direction of the moving contact (2), the arc extinguishing grid piece 1 (401a) is provided with a bent portion (401a01) extending towards a side close to the moving contact (2), and the arc extinguishing grid piece 1 (401a) is provided with a mounting notch (401a02) at a position corresponding to the intermediate insulator (403); The second arc-extinguishing grid piece (401b) is located on a side of the first arc-extinguishing grid piece (401a) facing the end of the moving contact (2), and the second arc-extinguishing grid piece (401b) is provided with a notch (401b01); A plurality of arc extinguishing grid pieces three (401c) are located on a side of the arc extinguishing grid piece two (401b) facing the end of the moving contact (2), the arc extinguishing grid piece three (401c) is provided with a notch two (401c01), and a protrusion (401c0101) is provided on the notch two (401c01) at a position corresponding to the intermediate insulator (403).

5. An arc extinguishing chamber according to claim 1, characterized in that: The intermediate insulator (403) includes at least one insulating plate (403a), and a mounting hole (403a01) matching with the protrusion (401c0101) is provided on the outer edge of the insulating plate (403a).

6. An arc extinguishing chamber according to claim 1, characterized in that: The intermediate insulator (403) comprises at least one insulating plate (403a), and a protrusion (403a02) matching with the installation notch (401a02) is provided at one end of the outer edge of the insulating plate (403a).

7. An arc extinguishing chamber according to claim 1, characterized in that: The intermediate insulator (403) comprises at least one insulating plate (403a), and two ends of the insulating plate (403a) are respectively provided with a first mounting protrusion (403a03) and a second mounting protrusion (403a04) which are matched with the housing (1).

8. An arc extinguishing chamber according to claim 1, characterized in that: The intermediate insulator (403) comprises at least one insulating plate (403a), wherein the insulating plate (403a) comprises an insulating plate 1 (403b) and an insulating plate 2 (403b'), wherein the insulating plate 1 (403b) and the insulating plate 2 (403b') are integrally formed or formed by splicing.

9. An arc extinguishing chamber according to claim 1, characterized in that: During the rotation process, the contact portion (201) of the moving contact (2) extends into the slot one (401b01) and the slot two (401c01) in the arc extinguishing grid plate group (401).

10. An arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing chamber (4) is arc-shaped.

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