Moving contact of switch

Abstract

A moving contact of a switch belongs to the technical field of circuit breakers. Comprising a contact support, a contact piece and a pair of side plates, the contact piece is rotatably arranged on the contact support, the side plates are metal plates, the pair of side plates are arranged on the two sides of the contact support respectively, and the contact also comprises an independently-formed insulation blocking piece. And the insulating blocking piece at least covers the upper side part, corresponding to the rotating end of the contact support, of the side plate. The high-voltage switch has the advantages that the insulating blocking pieces are respectively arranged on the outer sides of the metal side plates on the two sides of the moving contact, so that the problem of breakdown on the metal side plates can be effectively prevented, and the switch can meet the requirement of high voltage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, specifically relates to a moving contact of switch. BACKGROUND

[0002] Air switch, also called air circuit breaker, is a kind of very important electrical equipment in low-voltage distribution network and electric power driving system, is accessed to power supply network, and is used for protecting the load under it from damage of fault current.The selection of air switch is crucial for protecting line and preventing fire.With the high-speed development of new energy industry, the use occasion of circuit breaker is increasing, and the user also puts forward new requirements for the voltage of existing air circuit breaker.The voltage requirement of circuit breaker takes rated working voltage as core, needs to cover the highest operating voltage of system and match insulation and impact resistance.

[0003] The high voltage requirement of circuit breaker needs to match high insulation requirement.When the moving contact and static contact are separated, the arc gas is more likely to break down due to its diffusion.For example, metal side plates are installed on the two sides of the moving contact, specifically on the two sides of the contact support of the moving contact, the existence of the side plates makes it more likely to break down, but the metal side plates are necessary to ensure the reliability of installation and positioning.Therefore, the technical personnel in the field have been plagued by the breakdown side effect caused by the metal side plates on the two sides of the moving contact.

[0004] In view of the above technical problems, the applicant has made a beneficial design, and the technical scheme to be introduced below is generated in this background. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a moving contact of switch, and an insulating blocking piece is arranged on the outer side of the metal side plates on the two sides of the moving contact, so that the breakdown problem caused by the metal side plates is solved.

[0006] The utility model is achieved in this way, comprising a contact support, a contact piece and a side plate, the contact piece is rotatably arranged on the contact support, the side plate is a metal plate and has a pair, the pair of side plates are arranged on the left and right sides of the contact support, and further comprising a separately-formed insulating blocking piece, the insulating blocking piece covers at least the upper side part of the side plate corresponding to the rotating end of the contact support.

[0007] In one specific embodiment of the utility model, the insulating blocking piece is an insulating coating.

[0008] In another specific embodiment of the utility model, the insulating blocking piece is a plate material, comprising a first blocking piece and a second blocking piece, the first blocking piece and the second blocking piece are arranged on the outer side of the pair of side plates.

[0009] In another specific embodiment of the utility model, the shape of the first blocking piece matches the corresponding one side recess on the contact support; the shape of the second blocking piece matches the corresponding another side recess on the contact support.

[0010] In still another specific embodiment of the utility model, a hinged arm is further included, which is hinged to the back of the contact support away from the contact patch.

[0011] In still another specific embodiment of the utility model, a contact cover is further included, which is clamped into position from the front side of the contact patch and clamped with the pair of side plates on both sides.

[0012] In still another specific embodiment of the utility model, the first blocking piece includes a first plate body, a first fixing hole is formed on the first plate body for connecting and fixing with one side plate of the pair of side plates; the second blocking piece includes a second plate body, a second fixing hole is formed on the second plate body for connecting and fixing with another side plate of the pair of side plates.

[0013] In still another specific embodiment of the utility model, a first recess is further formed on the inner side of the first plate body towards the side plate; a second recess is further formed on the inner side of the second plate body towards the side plate, the first recess and the second recess are used for covering the screw caps of the screws on the corresponding side plate.

[0014] In still another specific embodiment of the utility model, a flange part is further formed on the side of the first plate body and corresponding to the mounting part of the hinged arm, the flange part matches the shape of the recess cavity of the corresponding side of the contact support.

[0015] In still another specific embodiment of the utility model, the flange part extends to the side plate and covers the side edge of the corresponding area of the side plate.

[0016] The utility model discloses the above structure, at least the metal side plate on the upper part of the moving contact two sides respectively sets up the insulating blocking piece, compared with the prior art, has the beneficial effect that: can effectively prevent the breakdown problem on the metal side plate, makes the switch can adapt to the demand of high voltage, expands the application range of switch, the insulating blocking piece and the contact support match in shape, further improves the insulation effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the explosion schematic view of the switch of the utility model;

[0018] Figure 2The explosion schematic view of the movable contact head;

[0019] Figure 3 The one-side perspective view of the contact cover;

[0020] Figure 4 The other-side perspective view of the contact cover;

[0021] Figure 5 The outside perspective view of the first insulating piece;

[0022] Figure 6 The inside perspective view of the first insulating piece;

[0023] Figure 7 The one-side perspective view of the second insulating piece;

[0024] Figure 8 The other-side perspective view of the second insulating piece.

[0025] In the figure: 1. shell, 11. base, 12. bottom plate; 2. contact system, 21. movable contact head, 211. contact support, 212. contact piece, 2121. main contact piece, 2122. arc contact piece, 213. side plate, 2131. clamping groove, 214. contact cover, 2141. communication part, 2142. fin, 21421. accommodation notch, 2143. side wall, 21431. first clamping boss, 21432. second clamping boss, 215. insulating blocking piece, 2151. first blocking piece, 21511. first plate body, 21512. flange part, 21513. first fixing hole, 21514. first positioning groove, 21515. first recess, 21516. first accommodation cavity, 2152. second blocking piece, 21521. second plate, 21522. second fixing hole, 21523. second positioning groove, 21524. second recess, 21525. second accommodation cavity, 216. wire outlet row, 217. mounting seat, 218. hinged arm, 219. rotating shaft, 22. stationary contact head. DETAILED DESCRIPTION

[0026] The specific embodiments of the utility model are described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any form but not substantial change according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0027] In the following description, the concepts of up, down, left, right, front and back are relative to the position of the figure being described, and are intended to facilitate the understanding of the public, and therefore cannot be understood as a special limitation on the technical solutions provided by the utility model.

[0028] Please refer to Figure 1 The utility model relates to a kind of switches, the switch includes isolating switch and circuit breaker.Specifically, switch includes shell 1, the shell 1 has contact arc-extinction cavity, the contact arc-extinction cavity is equipped with contact system 2, the arc-extinction chamber (not shown) of switch is inserted into the contact arc-extinction cavity from the top opening of contact arc-extinction cavity, and it is located above the contact system 2.

[0029] Further, the shell 1 is spliced by base 11 and bottom plate 12.Usually, the base 11 and the bottom plate 12 are fixed by screwing.The contact system 2 includes movable contact 21 and static contact 22, the movable contact 21 is installed on the base 11, and the static contact 22 is installed on the bottom plate 12.Specifically, the movable contact 21 is rotatably arranged, and the static contact 22 is fixedly arranged.Of course, the movable contact 21 and the static contact 22 can also be installed on the same side of the shell 1, for example, both are installed on the bottom plate 12, at this time, the base 11 can be called a cover, which covers the bottom plate 12.

[0030] As Figure 2As shown, the moving contact 21 comprises a contact support 211, a contact piece 212, a side plate 213 and a contact cover 214. The contact support 211 is made of insulating material, such as DMC, BMC and other thermosetting materials. The contact piece 212 is rotatably arranged on the contact support 211 and comprises main contact pieces 2121 and arc contact pieces 2122 arranged side by side. Specifically, the arc contact pieces 2122 are located in the middle, and the main contact pieces 2121 are located on the left and right sides of the arc contact pieces 2122. More specifically, the arc contact pieces 2122 are a group of multiple pieces arranged side by side, and the main contact pieces 2121 are also multiple pieces but divided into two groups, which are respectively located on the left and right sides of the group of arc contact pieces 2122. The side plate 213 has a pair, which is respectively installed on the left and right sides of the contact support 211, and provides installation and positioning effect for other parts of the moving contact 21. The side plate 213 is preferably a metal side plate, thereby having better strength. A rotating shaft 219 passes through the middle of the contact piece 212, and the two ends are rotatably arranged on a pair of side plates 213, thereby realizing the rotatable arrangement of the contact piece 212 and the side plate 213, and further realizing the rotatable arrangement of the contact piece 212 and the contact support 211. The contact cover 214 is installed from the front side of the contact piece 212, that is, from the side away from the contact support 211. The contact cover 214 is made of insulating material, and preferably made of thermoplastic material. The contact cover 214 is clamped into place from the front side of the contact piece 212 and the left and right sides of the length direction, that is, the left and right sides, are clamped with the pair of side plates 213, thereby completing the installation. This installation method replaces the original contact cover 214 using threaded fastening, effectively improving the installation efficiency.

[0031] Continuing to see Figure 1 and Figure 2 , the moving contact 21 further comprises a wire outlet row 216, a mounting seat 217 and a hinged arm 218. The wire outlet row 216 is located at one end of the rotating center of the moving contact 21, the mounting seat 217 is installed on the wire outlet row 216 and fixed with the base 11 of the shell 1, thereby keeping the wire outlet row 216 fixed relative to the base 11. The wire outlet row 216 is conductively connected with one end of the contact piece 212 through a conductive soft connection (not shown). One end of the hinged arm 218 is hinged on the contact support 211, specifically on the back of the contact support 211 away from the contact piece 212; the other end of the hinged arm 218 is connected with the operating mechanism (not shown) of the switch, and the operating mechanism of the switch drives the moving contact 21 to act through the hinged arm 218 after acting.

[0032] See Figure 3 and Figure 4The contact cover 214 includes a communication part 2141, a fin 2142 and a pair of side walls 2143. The communication part 2141 is connected between the pair of side walls 2143, and the contact cover 214 is formed as a " " shape. The fin 2142 extends from the inner side of the communication part 2141 to the contact piece 212 and is inserted between adjacent contact pieces 212. The fin 2142 is provided with a gap 21421 opening towards the rotating shaft 219, and the gap 21421 is used for avoiding the rotating shaft 219. The pair of side walls 2143 are respectively provided with a first clamping boss 21431 on the inner side, and a second clamping boss 21432 on the outer side.

[0033] Continuing to see Figure 2 The side plate 213 is provided with a clamping groove 2131. When the contact cover 214 is installed on the movable contact 21, the front part of the side wall 2143 is covered on the outer side of the side plate 213, the front part of the side wall 2143 is clamped into the end part of the side plate 213, and the first clamping boss 21431 is clamped with the clamping groove 2131, so that the installation of the contact cover 214 and the side plate 213 is completed. Further, the first clamping boss 21431 can be clamped on the contact support 211 through the clamping groove 2131.

[0034] Similarly, the side wall 2143 of the contact cover 214 can also be clamped from the inner side of the side plate 213, at this time, the side wall 2143 is located between the contact support 211 and the side plate 213. The side wall 2143 can be clamped on the side plate 213 and / or the contact support 211. At this time, the clamping on the inner side of the side wall 2143 is realized by the first clamping boss 21431, and the clamping on the outer side of the side wall 2143 is realized by the second clamping boss 21432. In a specific selection, the first clamping boss 21431 and the second clamping boss 21432 should be selected according to actual needs.

[0035] The improvement of the utility model lies in that the pair of side plates 213 are respectively provided with an independently formed insulation blocking piece 215, which is used for improving the insulation of the movable contact 21, that is, preventing the side plate 213 from being broken down with other metal parts. In the description, the "independently formed" means that the insulation blocking piece 215 is not integrally formed with other parts of the movable contact 21, for example, integrally formed with the contact cover 214 or the contact support 211. The mounting and cooperation relationship between the insulation blocking piece 215 and other parts of the movable contact 21 still belongs to the limited range of "independently formed", and falls into the protection range.

[0036] Specifically, the insulation blocking piece 215 is a plate, comprising a first blocking piece 2151 and a second blocking piece 2152, the first blocking piece 2151 and the second blocking piece 2152 are both made of insulation material and are installed on the two outer sides of the pair of side plates 213 respectively. The shape of the first blocking piece 2151 matches the corresponding lateral recess on the contact support 211; the shape of the second blocking piece 2152 matches the corresponding lateral recess on the contact support 211.

[0037] Continuing to see Figure 2 The first blocking piece 2151 is installed on the outer side of one of the pair of side plates 213. The first blocking piece 2151 covers the upper side part of the side plate 213 corresponding to the rotating end of the contact support 211. In order to achieve insulation effect, the shape of the first blocking piece 2151 matches the lateral recess of the contact support 211, so that the occurrence of breakdown can be effectively prevented.

[0038] Specifically, see Figure 5 And Figure 6 The first blocking piece 2151 comprises a first plate body 21511, and the first plate body 21511 is provided with a first fixing hole 21513 and a first positioning groove 21514. Preferably, the first fixing hole 21513 is a circular hole and there are three of them, which are used to realize the connection and fixation of the first blocking piece 2151 and the corresponding side plate 213. The first positioning groove 21514 is a strip-shaped closed groove and is arranged close to the contact cover 214, which is used to cooperate with the installation of the contact cover 214. The first plate body 21511 is further formed with a first recess 21515 and a first accommodation cavity 21516 on the inner side facing the side plate 213. The first recess 21515 is preferably three, which are used to cover the screw caps of the screws on the corresponding side plate 213. The first accommodation cavity 21516 is used for the clamping of the front part of the side wall 2143 of the contact cover 214, so the shape of the first accommodation cavity 21516 needs to match the shape of the front part of the side wall 2143. Further, the first positioning groove 21514 is located in the area of the first accommodation cavity 21516.

[0039] The first blocking piece 2151 is further formed with a flange part 21512 on the side of the first plate body 21511 and corresponding to the installation position of the articulated arm 218, the flange part 21512 matches the corresponding lateral recess of the contact support 211 in shape, which can effectively prevent the occurrence of breakdown and achieve better insulation effect. Preferably, the flange part 21512 extends to the side plate 213 and covers the side edge of the corresponding area of the side plate 213.

[0040] Still seeFigure 2 The second blocking piece 2152 is installed on the outside of the other side plate 213 of the pair of side plates 213. The second blocking piece 2152 covers the upper portion of the side plate 213 corresponding to the rotating end of the contact support 211. In order to achieve the insulation effect, the shape of the second blocking piece 2152 matches the lateral recess of the contact support 211, thereby effectively preventing the occurrence of breakdown.

[0041] Specifically, referring to Figure 7 and Figure 8 The second blocking piece 2152 includes a second plate body 21521, and the second plate body 21521 is provided with a second fixing hole 21522 and a second positioning groove 21523. Preferably, the second fixing hole 21522 is a circular hole and there are three of them, which are used to achieve the connection and fixation of the second blocking piece 2152 and the corresponding side plate 213. The second positioning groove 21523 is a strip-shaped closed groove and is arranged close to the contact cover 214, which is used to cooperate with the installation of the contact cover 214. The second plate body 21521 is further provided with a second recess 21524 and a second accommodation cavity 21525 on the inside facing the side plate 213. The second recess 21524 is preferably three, which are used to cover the screw caps of the screws on the corresponding side plate 213. The second accommodation cavity 21525 is used for the front part of the side wall 2143 of the contact cover 214 to be clamped in, so the shape of the second accommodation cavity 21525 needs to match the shape of the front part of the side wall 2143. Further, the second positioning groove 21523 is located in the area of the second accommodation cavity 21525.

[0042] Further, in order to improve the installation effect of the contact cover 214, at the same time, improve the insulation of the two sides of the movable contact 21 and prevent breakdown, the first blocking piece 2151 is arranged on the outside of one side plate 213 of the pair of side plates 213, and the second blocking piece 2152 is arranged on the outside of the other side plate 213. Specifically, on one side of the movable contact 21, the first blocking piece 2151 is fixed to the side plate 213 while covering the front part of the side wall 2143 of the contact cover 214, and the second clamping boss 21432 on the side wall 2143 is clamped into the first positioning groove 21514 on the first blocking piece 2151, thereby strengthening the installation effect of the first blocking piece 2151; as for the other side of the movable contact 21, i.e. the side where the second blocking piece 2152 is installed, the second blocking piece 2152 is fixed to the side plate 213 while covering the front part of the side wall 2143, and the second clamping boss 21432 on the side wall 2143 is clamped into the second positioning groove 21523 on the second blocking piece 2152.

[0043] Further, in order to improve the insulation effect of the two sides of the movable contact 21, an insulating coating can also be applied on the side plate 213. Of course, referring to the above embodiment, the insulating coating can be applied only partially. Preferably, the insulating coating is applied on the upper side of the side plate 213 corresponding to the rotating end of the contact support 211. That is, the insulating coating can be an embodiment of the insulating barrier 215.

Claims

1. A movable contact of a switch, comprising a contact support (211), a contact blade (212) and side plates (213), said contact blade (212) being pivotally arranged on said contact support (211), said side plates (213) being metal plates and having a pair, one pair of side plates (213) being arranged on the left and right sides of said contact support (211), characterized in that: Further comprising a separately formed insulation blocking piece (215), which covers at least the upper side of the side plate (213) corresponding to the rotating end of the contact support (211). ​ 2. A movable contact of a switch according to claim 1, characterized in that: The insulation blocking piece (215) is an insulation coating.

3. A movable contact of a switch according to claim 1, characterized in that: The insulation blocking piece (215) is a plate, comprising a first blocking piece (2151) and a second blocking piece (2152), which are separately arranged on the outer side of the pair of side plates (213).

4. A movable contact of a switch according to claim 3, characterized in that: The first blocking piece (2151) is shaped to match the corresponding side recess on the contact support (211); the second blocking piece (2152) is shaped to match the corresponding other side recess on the contact support (211).

5. A movable contact of a switch as defined in claim 3, characterized in that: Further comprising a hinged arm (218), which is hinged to the back of the contact support (211) away from the contact patch (212).

6. A movable contact of a switch as defined in claim 1, characterized in that: Further comprising a contact cover (214), which is clamped into place from the front side of the contact patch (212) and is clamped on both sides with the pair of side plates (213).

7. A movable contact of a switch as defined in claim 5, characterized in that: The first blocking piece (2151) comprises a first plate body (21511) with a first fixing hole (21513) for connecting and fixing with one side plate (213) of the pair of side plates (213); the second blocking piece (2152) comprises a second plate body (21521) with a second fixing hole (21522) for connecting and fixing with the other side plate (213) of the pair of side plates (213).

8. A movable contact of a switch according to claim 7, characterized in that: The first plate body (21511) further forms a first recess (21515) on the inner side facing the side plate (213); the second plate body (21521) further forms a second recess (21524) on the inner side facing the side plate (213), and the first recess (21515) and the second recess (21524) are used to cover the screw cap of the screw on the corresponding side plate (213).

9. A movable contact of a switch as defined in claim 7, characterized in that: The first blocking piece (2151) further forms a flange portion (21512) on the side of the first plate body (21511) corresponding to the installation of the hinged arm (218), which is shaped to match the corresponding recess on the side of the contact support (211).

10. A movable contact of a switch according to claim 9, characterized in that: The flange portion (21512) extends to the side plate (213) and covers the side edge of the corresponding area of the side plate (213).

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