Contact arc extinguishing device

Abstract

A contact arc extinguishing device belongs to the technical field of low-voltage apparatuses. Comprising a contact system and an arc extinguish chamber, the contact system comprises a moving contact and a static contact, the moving contact comprises a moving contact piece, a contact cover and a contact support, the contact cover is installed on the contact support, and the moving contact piece comprises a long contact piece and a short contact piece; the side, close to the contact system, of the arc extinguish chamber is provided with an arc channel, the contact cover is further provided with an insulating partition plate, the long contact piece is matched with the insulating partition plate and inserted into the arc channel, the short contact piece is located on the outer side of the arc channel, the head of the insulating partition plate is inserted into the arc channel, and the insulating partition plate is provided with an amplifying edge. Therefore, a gap between the insulating partition plate and the inner side wall of the arc channel is reduced. The arc extinguishing chamber has the advantages that the insulating partition plate arranged on the contact cover extends into the arc channel on the arc extinguishing chamber to prevent arc gas from moving downwards, and the insulating partition plate is provided with the amplifying edge, so that a gap between the insulating partition plate and the inner side wall of the arc channel is reduced, and the downward movement of the arc gas is reduced while the flexibility is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the low voltage electrical apparatus technical field, concretely relates to a contact arc extinguishing device. BACKGROUND

[0002] Switches are widely used in low-voltage distribution systems, and are a kind of switch that can close, carry and break the current under normal circuit conditions, providing safety protection for the circuit.

[0003] In the prior art, at least one arc contact is provided on the end of the moving contact body close to the arc extinguishing unit, on the one hand, the arc contact point is in contact with the corresponding static contact point earlier than other moving contact points when closing, and the arc contact point is separated from the corresponding static contact point later than other moving contact points when opening, so that only the arc contact has an arc when breaking the current, and other moving contact points do not generate an arc; on the other hand, the arc contact is stretched into the arc extinguishing cover with a narrow gap, which elongates the arc and uses the narrow gap effect to extrude the arc and burn the gas generating material to extinguish the arc. At the same time, during the opening process, an arc is formed between the arc contact and the arc guide piece of the arc extinguishing chamber, and if not effectively controlled, the arc will move randomly in the arc guide piece area of the arc extinguishing chamber, and as the breaking capacity / number increases, the inner wall of the narrow gap of the arc extinguishing chamber will be contaminated due to the burning or high-temperature ionized gas of the arc, and the contaminated area will gradually expand, which can extend to the main contact area, causing the main contact to break down.

[0004] For example, the utility model patent authorized publication number CN220856379U discloses a "contact arc extinguishing system of switch", which has an insulating partition plate inserted into the narrow gap of the arc extinguishing chamber, which blocks the arc gas from flowing out of the arc extinguishing chamber and entering the main contact area, preventing the arc gas from contacting the main contact. However, since the insulating partition plate is inserted into the narrow gap, the tightness of the cooperation between them also determines the sealing performance of the insulating partition plate. If the gap is too small, the interference between the two will occur after the parts are heated and expanded, affecting the flexibility of the movable cooperation between the two, and if the gap is too large, the effect of blocking the arc gas will be reduced. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a contact arc extinguishing device, which inserts an insulating partition plate provided on the contact cover into an arc passage on the arc extinguishing chamber to block the downward movement of the arc gas, and has an enlarged flange on both sides of the insulating partition plate to reduce the gap between the insulating partition plate and the inner side wall of the arc passage, while meeting the flexibility of movable cooperation between the two, and reducing the overflow of the arc gas from the gap downward.

[0006] The utility model discloses a contact arc extinguishing device, including contact system and arc extinguishing chamber, contact system include movable contact and static contact, movable contact include movable contact piece, contact cover and contact support, contact cover install on contact support, movable contact piece include long contact piece and short contact piece, the one side of arc extinguishing chamber close to contact system has electric arc channel, still have insulating baffle on contact cover, long contact piece and insulating baffle cooperate and insert into electric arc channel, and short contact piece is located the outside of electric arc channel, the head of insulating baffle inserts into electric arc channel, and there is amplification along on insulating baffle to reduce the gap between insulating baffle and the inner side wall of electric arc channel.

[0007] In one embodiment of the utility model, the amplification along is a pair, respectively located on both sides of the insulating baffle.

[0008] In another embodiment of the utility model, the long contact piece is provided with a movable arc contact point, and the short contact piece is provided with a movable main contact point, and the static contact is also provided with a static arc contact point and a static main contact point, the movable arc contact point is in contact with the static arc contact point, and the movable main contact point is in contact with the static main contact point, the movable arc contact point and the static arc contact point are located in the electric arc channel, and the insulating baffle blocks the movable arc contact point and the static arc contact point in the electric arc channel.

[0009] In yet another embodiment of the utility model, the long contact piece is in the middle, and the short contact pieces are arranged side by side on both sides of the long contact piece.

[0010] In still another embodiment of the utility model, the insulating baffle has a notch corresponding to the position of the long contact piece, and the long contact piece is embedded in the notch.

[0011] In still another embodiment of the utility model, the contact cover further includes a side portion, a crosspiece portion and an upper edge portion, the side portion is a pair and located on both sides of the cover body, the crosspiece portion is connected to the pair of side walls and located on the side of the movable contact piece close to the static contact, and the upper edge portion extends from the upper edge of the crosspiece portion to the static contact.

[0012] In further embodiment of the utility model, the opening of the electric arc channel is arc-shaped, and the amplification along is also arc-shaped and correspondingly matched.

[0013] In a further specific embodiment of the utility model, the insulating partition plate is combined on the upper edge, and the insert piece is combined on the inner side of the crosspiece.

[0014] In a further specific embodiment of the utility model, the insulating partition plate is combined on the upper edge, and the insert piece is combined on the inner side of the crosspiece.

[0015] In a further specific embodiment of the utility model, the arc extinguishing chamber comprises a pair of side walls, a plurality of grid pieces arranged between the side walls, the grid pieces are arranged at intervals; a pair of gas generating members are further arranged on the inner side of the side walls, the arc passage is formed by the interval arrangement of the pair of gas generating members.

[0016] The utility model has the beneficial effects that: the insulating partition plate on the contact cover is inserted into the arc passage on the arc extinguishing chamber to block the downward movement of the arc gas, and the enlarged flange is arranged on the insulating partition plate to reduce the gap between the insulating partition plate and the inner side wall of the arc passage, so that the arc gas is prevented from overflowing downward from the gap, the breakdown of the contact is prevented, and the arc extinguishing capacity of the arc extinguishing device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the contact arc extinguishing device of the utility model;

[0018] Figure 2 It is a structure schematic view of the movable contact of the utility model;

[0019] Figure 3 It is a structure schematic view of one side of the contact cover of the utility model;

[0020] Figure 4 It is a structure schematic view of the other side of the contact cover of the utility model;

[0021] Figure 5 It is a structure schematic view of the arc extinguishing chamber of the utility model;

[0022] Figure 6 It is a local schematic view of the cooperation of the insulating partition plate and the arc passage of the utility model.

[0023] In the figure: 1. contact system, 11. movable contact, 111. movable contact piece, 1111. long contact piece, 11111. movable arc contact, 1112. short contact piece, 11121. movable main contact, 112. contact cover, 1121. insert piece, 1122. insulating partition, 11221. enlarged edge, 11222. notch, 1123. upper partition piece, 1124. side part, 1125. crosspiece part, 1126. upper edge part, 113. contact support, 1131. side plate, 114. outgoing line row, 12. stationary contact; 2. arc extinguishing chamber, 21. side wall, 22. grid piece, 23. gas generating element, 12. stationary contact; 100. arc passage. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the description of the embodiments is not a limitation on the technical solutions, and any formal but not substantial changes according to the concept of the present application should be regarded as the protection scope of the present application.

[0025] In the following description, the concepts of up, down, left, right, front and back (or orientation) are all with respect to the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as a special limitation on the technical solutions provided by the present application.

[0026] As Figure 1 The present application relates to a contact arc extinguishing device, comprising a contact system 1 and an arc extinguishing chamber 2, wherein the contact system 1 comprises a movable contact 11 and a stationary contact 12, the movable contact 11 and the stationary contact 12 realize contact or separation, when the contact system 1 breaks the current, an arc will be generated thereon, the arc extinguishing chamber 2 is located on the opening side of the movable contact 11 and the stationary contact 12. After the arc is generated, it enters the inside of the arc extinguishing chamber 2 and is extinguished in the inside of the arc extinguishing chamber 2, at this time, the current is cut off.

[0027] As Figure 2 is a structural schematic view of the movable contact 11. The movable contact 11 comprises a movable contact piece 111, the movable contact piece 111 comprises a long contact piece 1111 and a short contact piece 1112, the long contact piece 1111 can also be called an arc contact piece, and the short contact piece 1112 can also be called a main contact piece. In the present embodiment, the long contact piece 1111 is in the middle, and the short contact piece 1112 is side by side on both sides of the long contact piece 1111. More specifically, the long contact piece 1111 is one, and the short contact piece 1112 is two groups, each group has four.

[0028] The moving contact 11 further comprises a contact cover 112, a contact support 113 and a wire outlet row 114. The moving contact 111 is rotatably arranged on the contact support 113, i.e. the moving contact 111 can rotate at an angle relative to the contact support 113. The end of the moving contact 111 away from the arc extinguishing chamber 2 is electrically connected to the wire outlet row 114 through a flexible connection. The contact cover 112 is mounted on the contact support 113 and encloses the moving contact 111 together with the contact support 113. A pair of side plates 1131 are further mounted on both sides of the contact support 113, and the side plates 1131 are fixed on the contact support 113. The end of the pair of side plates 1131 away from the contact support 113 is rotatably connected to the wire outlet row 114.

[0029] As Figure 3 , Figure 4 is a structural schematic view of the contact cover 112. The contact cover 112 comprises an insert piece 1121 inserted between adjacent moving contacts 111. The contact cover 112 further comprises an insulating partition plate 1122 extending upward from the contact cover 112. The insert piece 1121 extends from the contact cover 112 to the moving contact 111 and is inserted between adjacent moving contacts 111. The insulating partition plate 1122 extends upward from the contact cover 112.

[0030] Preferably, at least one insert piece 1121 has an upper spacing piece 1123 extending upward.

[0031] In the embodiment, the insulating partition plate 1122 is located on the side of the long contact piece 1111 close to the stationary contact 12. In order to better satisfy the cooperation between the insulating partition plate 1122 and the arc extinguishing chamber 2, the insulating partition plate 1122 has an enlarged edge 11221. Thus, the gap between the insulating partition plate 1122 and the arc passage 100 is reduced. Preferably, the enlarged edge 11221 is a pair of enlarged edges respectively located on both sides of the insulating partition plate 1122. In order to better satisfy the cooperation between the long contact piece 1111 and the insulating partition plate 1122, the insulating partition plate 1122 has a notch 11222 at the position corresponding to the long contact piece 1111, and the long contact piece 1111 is embedded in the notch 11222.

[0032] As for the body of the contact cover 112, the contact cover 112 comprises a side portion 1124, a crosspiece portion 1125 and an upper edge portion 1126. The side portion 1124 is a pair of side portions located on both sides of the cover body, and the crosspiece portion 1125 connects the pair of side walls 1124 and is located on the side of the moving contact 111 close to the stationary contact 12. The upper edge portion 1126 extends from the upper edge of the crosspiece portion 1125 to the stationary contact 12.

[0033] More specifically, the insulating partition 1122 is combined with the upper edge 1126, and the tab 1121 is combined with the inner side of the crosspiece 1125.

[0034] As Figure 5 is a schematic view of the structure of the arc extinguishing chamber 2. The arc extinguishing chamber 2 includes a pair of side walls 21, a plurality of grid plates 22 arranged between the side walls 21, and a pair of gas generating members 23 arranged on the inner side of the side walls 21. Preferably, the pair of gas generating members 23 cover the legs of the grid plates 22, and the pair of gas generating members 23 are arranged at intervals to form an arc passage 100, or a narrow gap. The arc passage 100 is located on the side of the arc extinguishing chamber 2 close to the contact system 1. The arc generated between the moving contact 11 and the stationary contact 12 enters the array of grid plates 22 through the arc passage 100.

[0035] The head of the insulating partition 1122 is inserted into the arc passage 100, thereby blocking the space between the moving contact 11 and the stationary contact 12 and preventing the arc gas from flowing out of the arc passage 100.

[0036] See Figures 1 to 6 For the present invention, the insulating partition 1122 has an enlarged side 11221. The enlarged side 11221 is opposite to the inner side wall of the arc passage 100. Due to the provision of the enlarged side 11221, the gap between the insulating partition 1122 and the inner side wall of the arc passage 100 is reduced. This reduces the overflow of arc gas from the arc extinguishing chamber 2. The enlarged side 11221 also protrudes into the arc passage 100. Since the enlarged side 11221 only occupies part of the insulating partition 1122, the flexibility of the active cooperation between the insulating partition 1122 and the arc passage 100 is ensured when the insulating partition 1122 is misassembled or impacted by heat. Preferably, the gap between the insulating partition 1122 and the inner side wall of the arc passage 100 is 0.1mm to 0.3mm. Preferably, the opening of the arc passage 100 is arc-shaped, and the enlarged side 11221 is also arc-shaped. Thus, the distance between the two does not change during the swing of the moving contact 11, and adapts to the movement trajectory of the swing of the moving contact 11.

[0037] The moving contact 11 has a notch on the stationary contact 12 in the swing process, so that the insulating partition plate 1122 can block the space between the moving contact 11 and the stationary contact 12, and the insulating partition plate 1122 is inserted into the notch, so that when the switch is closed, the insulating partition plate 1122 is inserted into the notch, and gradually swings out of the notch during the separation of the moving contact 11 and the stationary contact 12.

[0038] Preferably, the upper spacing piece 1123 is two, extending upward from the insertion piece 1121, and each upper spacing piece 1123 is located between a group of short contact pieces 112. More specifically, the upper spacing piece 1123 divides the four short contact pieces 1112 into two and two.

[0039] The long contact piece 1111 is provided with a moving arc contact 11111, and the short contact piece 1112 is provided with a moving main contact 11121. Correspondingly, the stationary contact 12 is also provided with a stationary arc contact and a stationary main contact, wherein the moving arc contact 11111 is in contact with the stationary arc contact, and the moving main contact 11121 is in contact with the stationary main contact. The moving arc contact 11111 and the stationary arc contact are located in the arc channel 100, and the insulating partition plate 1122 blocks the moving arc contact 11111 and the stationary arc contact inside the arc channel 100.

Claims

1. A contact arc extinguishing device, comprising a contact system (1) and an arc chamber (2), said contact system (1) comprising a moving contact (11) and a stationary contact (12), said moving contact (11) comprising a moving contact blade (111), a contact cover (112) and a contact support (113), said contact cover (112) being mounted on said contact support (113), said moving contact blade (111) comprising a long contact blade (1111) and a short contact blade (1112); said arc chamber (2) having an arc passage (100) on one side close to said contact system (1), and further having an insulating partition (1122) on said contact cover (112), said long contact blade (1111) cooperating with said insulating partition (1122) and being inserted into said arc passage (100), and said short contact blade (1112) being located outside said arc passage (100), the head of said insulating partition (1122) being inserted into said arc passage (100), characterized in that: The insulation partition (1122) has an enlarged edge (11221) to reduce the gap between the insulation partition (1122) and the inner side wall of the arc channel (100).

2. A contact arc extinguishing device according to claim 1, characterized in that: The enlarged edge (11221) is a pair of edges respectively located on the two sides of the insulation partition (1122).

3. A contact arc extinguishing device according to claim 1, characterized in that: The long contact piece (1111) is provided with a movable arc contact point (11111), and the short contact piece (1112) is provided with a movable main contact point (11121). Correspondingly, the static contact (12) is also provided with a static arc contact point and a static main contact point. The movable arc contact point (11111) is in contact with the static arc contact point, and the movable main contact point (11121) is in contact with the static main contact point. The movable arc contact point (11111) and the static arc contact point are located in the arc channel (100), and the insulation partition (1122) blocks the movable arc contact point (11111) and the static arc contact point in the arc channel (100).

4. A contact arc extinguishing device according to claim 3, characterized in that: The long contact piece (1111) is located in the center, and the short contact pieces (1112) are located on the two sides of the long contact piece (1111).

5. A contact arc extinguishing device according to claim 3, characterized in that: The insulation partition (1122) has a notch (11222) corresponding to the position of the long contact piece (1111), and the long contact piece (1111) is embedded in the notch (11222).

6. A contact arc extinguishing device according to claim 1, characterized in that: The contact cover (112) further comprises a side portion (1124), a cross portion (1125), and an upper edge portion (1126). The side portion (1124) is a pair of side portions located on the two sides of the cover body. The cross portion (1125) is connected to the pair of side portions (1124) and is located on the side of the movable contact piece (111) close to the static contact (12). The upper edge portion (1126) extends from the upper edge of the cross portion (1125) to the static contact (12).

7. A contact arc extinguishing device according to claim 1, characterized in that: The opening of the arc channel (100) is in the shape of a circular arc, and the enlarged edge (11221) is also in the shape of a circular arc.

8. A contact arc extinguishing device according to claim 2, characterized in that: The contact cover (112) further comprises an insertion piece (1121) inserted between adjacent movable contact pieces (111). At least one insertion piece (1121) has an upward extending upper spacing piece (1123), and each upper spacing piece (1123) is located between a group of short contact pieces (112).

9. A contact arc extinguishing device according to claim 1, characterized in that: The insulation partition (1122) is combined with the upper edge portion (1126), and the insertion piece (1121) is combined with the inner side of the cross portion (1125).

10. A contact arc extinguishing device according to claim 1, characterized in that: The arc extinguishing chamber (2) comprises a pair of side walls (21) and a plurality of grid pieces (22) arranged between the side walls (21). The arc channel (100) is formed by a pair of gas generating members (23) arranged between the side walls (21).

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