Arc extinguishing system of switch

Abstract

An arc extinguishing system of a switch comprises a moving contact and an arc extinguishing chamber, the moving contact is provided with at least two arc moving contact pieces, the arc extinguishing chamber is provided with narrow slits with the corresponding number at positions corresponding to the at least two arc moving contact pieces, when the switch is switched off, the contact parts of the at least two arc moving contact pieces can move into the corresponding narrow slits, and the contact parts of the at least two arc moving contact pieces can move into the corresponding narrow slits. And the plurality of active contact sheets are arranged outside the narrow slit. And when the switch is switched off for arc extinguishing, a random one of the at least two arc moving contacts, which is separated after being opposite to the static contact, is subjected to arc starting and is subjected to arc extinguishing in the corresponding narrow slit. When the contact of one arc moving contact piece has excessive electrical wear, the arc starts on the other arc moving contact piece. According to the two arc contact structures, the critical current problem is solved, and the mechanical service life and the electrical service life are prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and specifically relates to an arc extinguishing system of a switch. 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 DC3000V. Among isolating switches, the current products can only reach DC750V for a single pole and DC1500V for two poles. The products of various companies cannot meet the requirements of DC3000V. The reason is that when the existing frame-type isolating switches or frame-type circuit breakers use grid arc extinguishing chambers, the arc cannot be extinguished at the critical low current.

[0003] In order to solve this problem, the following three methods are usually used in the prior art:

[0004] (1) Increasing the distance between the moving and static contacts to extinguish the critical current can greatly improve the arc extinguishing ability, but it also has the disadvantage of increasing the size of the switch;

[0005] (2) Adding permanent magnets to the switch arc extinguishing system to improve the arc extinguishing ability of the arc extinguishing system by using the magnetic blowing effect. However, when designed in this way to be non-polar or polar, it is difficult to meet product requirements and increases product costs.

[0006] (3) The arc extinguishing capacity of the arc extinguishing chamber is improved by designing a narrow gap on the arc extinguishing chamber. However, when it is applied to a switch with a large rated current, generally only one arc contact can be used to extend into the narrow gap, and the rest are main contacts. With only one arc contact, it is easy to cause the arc contact to deform or even break after multiple life operations. Utility Model Content

[0007] The purpose of the utility model is to provide an arc extinguishing system for a switch, in which double arc contact pieces are arranged on the moving contact, and the double arc contact pieces are respectively extended into the corresponding several narrow slots on the arc extinguishing chamber. In this way, the double arc contact piece structure solves the problem that the arc cannot be extinguished when a critical small current exists, and increases the mechanical life and electrical life.

[0008] Technical Solution

[0009] In order to solve the above technical purpose, the utility model provides an arc extinguishing system of a switch, which includes a moving contact and an arc extinguishing chamber, and is characterized in that: at least two arc moving contacts and a plurality of active contacts are arranged on the moving contact, and a corresponding number of narrow slots are arranged at positions corresponding to the at least two arc moving contacts on the arc extinguishing chamber. When the switch is opened, the contact parts of the at least two arc moving contacts can move into the corresponding narrow slots, and the plurality of active contacts are outside the narrow slots.

[0010] In one embodiment, the plurality of active contact pieces and the at least two arc-moving contact pieces are arranged side by side, and a plurality of active contact pieces are arranged between and outside the at least two arc-moving contact pieces.

[0011] In one embodiment, the arc extinguishing chamber includes a plurality of arc extinguishing grids, and the plurality of arc extinguishing grids are provided with raised corners and arc striking notches.

[0012] In one embodiment, the arc-striking notches on the arc-extinguishing grids are in a triangular shape.

[0013] In one embodiment, the arc-striking notches of adjacent arc-extinguishing grids are arranged alternately.

[0014] In one embodiment, the plurality of arc-extinguishing grids are in a convex shape.

[0015] In one of the embodiments, gas producing component one is mounted on a middle raised corner formed by a plurality of arc extinguishing grids, gas producing component two and gas producing component three are respectively mounted on a left raised corner and a right raised corner formed by a plurality of arc extinguishing grids, and two side walls of gas producing component one form narrow gaps with one side wall corresponding to gas producing component two and gas producing component three.

[0016] In one of the embodiments, a plurality of magnetic conductive sheet arrays are arranged in the second gas generating component and the third gas generating component.

[0017] In one of the embodiments, a plurality of magnetic conductive sheet arrays are arranged in magnetic conductive sheet installation grooves provided in the second gas generating component and the third gas generating component.

[0018] Beneficial Effects

[0019] The utility model provides an arc extinguishing system for a switch, which includes a moving contact and an arc extinguishing chamber, wherein at least two arc moving contacts are arranged on the moving contact, and a corresponding number of narrow slits are arranged at positions corresponding to the at least two arc moving contacts on the arc extinguishing chamber, and when the switch is opened, the contact parts of the at least two arc moving contacts can move into the corresponding narrow slits. When the switch is opened and the arc is extinguished, one of the at least two arc moving contacts, which is separated from the static contact, randomly starts an arc and is extinguished in its corresponding narrow slit. When the contact point of one arc moving contact has excessive electrical wear, the arc starts on the other arc moving contact. In this way, the structure of the two arc contacts solves the critical current problem and increases the mechanical life and electrical life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Attached Figure 1 It is a schematic diagram of the arc extinguishing system of the switch of the embodiment of the utility model;

[0022] Attached Figure 2 This is a schematic diagram of a moving contact in an embodiment of the utility model;

[0023] Attached Figure 3 It is a schematic diagram of a narrow slit in an embodiment of the utility model;

[0024] Attached Figure 4 It is a schematic diagram of the positive and negative alternating arrangement of arc extinguishing grids in an embodiment of the utility model;

[0025] Attached Figure 5 This is a schematic diagram of an arc extinguishing grid in an embodiment of the utility model;

[0026] Attached Figure 6 This is a schematic diagram of the installation of the magnetic conductor in the embodiment of the utility model; DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example

[0033] In the prior art, the arc extinguishing capacity of the arc extinguishing chamber is improved by designing a narrow gap on the arc extinguishing chamber. However, when it is applied to a switch with a large rated current, generally only one arc contact can be used to extend into the narrow gap, and the rest are main contacts. With only one arc contact, it is easy to cause the arc contact to deform or even break after multiple life operations. In order to solve this problem, as shown in the attached Figure 1As shown, this embodiment provides an arc extinguishing system of a switch, which includes a moving contact 1 and an arc extinguishing chamber 2, wherein at least two arc moving contact pieces 101 and a plurality of active contact pieces 102 are arranged on the moving contact 1, and a corresponding number of narrow slots 201 are arranged at positions corresponding to the at least two arc moving contact pieces 101 on the arc extinguishing chamber 2. When the switch is opened, the contact parts 101a of the at least two arc moving contact pieces 101 can move into the corresponding narrow slots 201, and the plurality of active contact pieces 102 are outside the narrow slots 201.

[0034] As attached Figure 2 As shown, the moving contact 1 includes a plurality of active contact pieces 102 and at least two arc moving contact pieces 101, the plurality of active contact pieces 102 and the at least two arc moving contact pieces 101 are arranged side by side, and a plurality of active contact pieces 102 are arranged between and outside the at least two arc moving contact pieces 101. Since the arc contact 101 is relatively long and finally separates from the stationary contact 7, the arc starts on the arc contact, and the active contact piece 102 only carries the current and does not participate in the breaking.

[0035] As attached Figure 5 As shown, the arc extinguishing chamber 2 includes a plurality of arc extinguishing grids 202, on which protruding corners 202a and arc striking notches 202b are provided, and the arc striking notches 202b on the plurality of arc extinguishing grids 202 are in a triangular shape. Figure 4 As shown, the arc-striking notches 202b of the adjacent arc-extinguishing grids 202 are arranged alternately. The arc-extinguishing grids 202 are in a convex shape.

[0036] As attached Figure 3 As shown, the gas producing part 1 3 is mounted on the middle raised corner 202a01 formed by a plurality of arc extinguishing grids 202, and the gas producing part 2 4 and the gas producing part 3 5 are mounted on the left raised corner 202a02 and the right raised corner 202a03 formed by a plurality of arc extinguishing grids 202, respectively. The two side walls of the gas producing part 1 3 respectively form narrow gaps with the side walls corresponding to the gas producing part 2 4 and the gas producing part 3 5. A plurality of magnetic conductive sheets 6 are arranged in an array in the gas producing part 2 4 and the gas producing part 3 5. Specifically, as shown in the attached figure, Figure 6 As shown, a plurality of magnetic conductive sheets 6 are arranged in an array in the magnetic conductive sheet installation grooves 401 , 501 provided in the gas producing component 2 4 and the gas producing component 3 5 .

[0037] This embodiment provides an arc extinguishing system for a switch. When the switch (especially a frame circuit breaker or a frame-type disconnector) is opened and arc extinguished, one of the at least two arc-moving contacts that is separated from the static contact at random starts arcing (i.e., the arc-moving contact with a larger overtravel starts arcing first) and is extinguished in its corresponding narrow gap. When the contact point of the arc-moving contact has excessive electrical wear, the arc starts on the other arc-moving contact. In this way, the at least two arc contact structures solve the critical current problem and increase the mechanical life and electrical life.

[0038] 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.

[0039] 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 system for a switch, comprising a moving contact (1) and an arc extinguishing chamber (2), characterized in that: At least two arc moving contact pieces (101) and a plurality of active contact pieces (102) are arranged on the moving contact (1); a corresponding number of narrow slits (201) are arranged at positions on the arc extinguishing chamber (2) corresponding to the at least two arc moving contact pieces (101); when the switch is opened, the contact parts (101a) of the at least two arc moving contact pieces (101) can move into the corresponding narrow slits (201), and the plurality of active contact pieces (102) are outside the narrow slits (201).

2. The arc extinguishing system of a switch according to claim 1, characterized in that: The plurality of active contact pieces (102) and at least two arc-moving contact pieces (101) are arranged side by side, and a plurality of active contact pieces (102) are arranged between and outside the at least two arc-moving contact pieces (101).

3. The arc extinguishing system of a switch according to claim 1, characterized in that: The arc extinguishing chamber (2) comprises a plurality of arc extinguishing grids (202), and the plurality of arc extinguishing grids (202) are provided with raised corners (202a) and arc striking notches (202b).

4. The arc extinguishing system of a switch according to claim 3, characterized in that: The arc striking notches (202b) on the plurality of arc extinguishing grid pieces (202) are in a triangular shape.

5. The arc extinguishing system of a switch according to claim 3, characterized in that: The arc-striking notches (202b) of adjacent arc-extinguishing grids (202) are arranged alternately.

6. The arc extinguishing system of a switch according to claim 3, characterized in that: The plurality of arc extinguishing grids (202) are in a convex shape.

7. The arc extinguishing system of a switch according to claim 3, characterized in that: The gas producing component one (3) is mounted on a middle raised corner (202a01) formed by a plurality of arc extinguishing grids (202); the gas producing component two (4) and the gas producing component three (5) are respectively mounted on a left raised corner (202a02) and a right raised corner (202a03) formed by a plurality of arc extinguishing grids (202); and the two side walls of the gas producing component one (3) respectively form narrow gaps with the side walls corresponding to the gas producing component two (4) and the gas producing component three (5).

8. The arc extinguishing system of a switch according to claim 7, characterized in that: A plurality of magnetic conductive sheets (6) are arranged in an array inside the second gas producing component (4) and the third gas producing component (5).

9. The arc extinguishing system of a switch according to claim 8, characterized in that: A plurality of magnetic conductive sheets (6) are arranged in an array in magnetic conductive sheet installation grooves (401, 501) provided in the second gas producing component (4) and the third gas producing component (5).

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