Moving contact system of switch

Abstract

A moving contact system of a switch belongs to the technical field of low-voltage apparatuses. Comprising a contact support, a contact piece and a contact cover, the contact piece is rotatably arranged on the contact support, the contact cover is located on the side, facing a static contact of a switch, of the contact piece, and the contact cover is clamped on the contact support through a lock catch connecting structure. The moving contact has the advantages that the contact cover of the moving contact is clamped on the contact support through the lock catch connecting structure, the assembly process is simplified, the assembly efficiency can be improved, and the assembly cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical appliance technology, specifically relating to a moving contact system for a switch. Background Technology

[0002] A switch is a very important electrical device. When connected to the power grid, it controls the opening and closing of the circuit when used as an isolating switch, and when used as a circuit breaker, it protects the downstream load from damage caused by fault current. It is an important electrical component in the circuit.

[0003] As the core component of a switch, the contact system plays a crucial role. The contact system can close and open, primarily responsible for performing the connection and disconnection operations in a circuit, ensuring safe and reliable switching during normal operation or in the event of a fault.

[0004] The contact system includes a moving contact and a stationary contact. The moving contact includes a contact support, a moving contact piece, and a contact cover. The moving contact piece is rotatably mounted on the contact support, and the contact cover is mounted on the side of the moving contact piece away from the contact support, serving to prevent the arc from descending. In the prior art, the contact cover is fixedly installed by a threaded connection. However, the drawback of threaded connections is that installation is cumbersome and assembly costs are high.

[0005] In view of the above problems, industry professionals have been pursuing a technical solution that can simplify the assembly process of moving contacts. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0006] The purpose of this invention is to provide a moving contact system for a switch, wherein the contact cover is snapped onto the contact support via a locking connection structure, which can improve assembly efficiency and reduce assembly costs.

[0007] The purpose of this utility model is achieved as follows: a moving contact system for a switch includes a contact support, a contact piece, and a contact cover. The contact piece is rotatably mounted on the contact support, and the contact cover is located on the side of the contact piece facing the stationary contact of the switch. The contact cover is snapped onto the contact support by a locking connection structure.

[0008] In a specific embodiment of this utility model, the contact support includes a pair of side plates, which are respectively disposed on the left and right sides of the contact support.

[0009] In another specific embodiment of this utility model, the contact cover includes a pair of sidewalls and a connecting portion between the pair of sidewalls. When the contact cover is installed on the moving contact of the switch, the front part of the sidewall covers the outside of the side plate. The locking connection structure includes one of a first snap-fit ​​boss and a snap-fit ​​groove located on the inner side of the pair of sidewalls. The side plate has the other of the first snap-fit ​​boss and the snap-fit ​​groove. The first snap-fit ​​boss and the snap-fit ​​groove engage in a snap-fit ​​cooperation.

[0010] In another specific embodiment of this utility model, the contact cover includes a pair of sidewalls and a connecting portion between the pair of sidewalls. When the contact cover is installed on the moving contact of the switch, the front part of the sidewall covers the outside of the side plate. The side plate is provided with a snap-fit ​​groove. The locking connection structure includes a first snap-fit ​​protrusion located inside the pair of sidewalls. The first snap-fit ​​protrusion extends through the snap-fit ​​groove and is secured to the contact support.

[0011] In another specific embodiment of the present invention, the contact cover includes a pair of sidewalls and a connecting portion between the pair of sidewalls, wherein the sidewalls are inserted between the inner side of the side plate and the outer side of the contact support.

[0012] In another specific embodiment of this utility model, an insulating sealing member is also included. The insulating sealing member is a plate and includes a first sealing member and a second sealing member. The first sealing member and the second sealing member are respectively installed on the two outer sides of a pair of side plates and cover the front part of the side wall.

[0013] In a further specific embodiment of this utility model, the pair of sidewalls have a second snap-fit ​​protrusion formed on their outer surfaces, the first sealing member has a first positioning groove, and the second sealing member has a second positioning groove. When the pair of sidewalls are installed in conjunction with the first sealing member and the second sealing member, the second snap-fit ​​protrusion on one side of the pair of sidewalls snaps into the first positioning groove, while the second snap-fit ​​protrusion on the other side snaps into the second positioning groove.

[0014] In a further specific embodiment of the present invention, the first sealing member has a first clearance cavity on the inner side facing the side plate, and the first positioning groove is located in the area of ​​the first clearance cavity. The second sealing member also has a second clearance cavity on the inner side facing the side plate, and the second positioning groove is located in the area of ​​the second clearance cavity. The first clearance cavity and the second clearance cavity are respectively used for the front parts of the pair of side walls to be engaged.

[0015] In yet another specific embodiment of the present invention, the first sealing member is further provided with a first fixing hole for connecting with one of the pair of side plates; the second sealing member is further provided with a second fixing hole for connecting with the other side plate.

[0016] In yet another specific embodiment of the present invention, the contact cover further includes a plurality of fins arranged side by side at intervals, the fins extending from the inside of the communicating portion toward the contact piece and inserted between adjacent contact pieces.

[0017] Because of the above-mentioned structure, this utility model allows the contact cover of the moving contact to be snapped onto the contact support via a locking connection structure. Compared with the existing threaded fixing method, this simplifies the assembly process, improves assembly efficiency, and reduces assembly costs. Attached Figure Description

[0018] Figure 1 This is an exploded view of the switch described in this utility model;

[0019] Figure 2 This is an explosion diagram of the moving contact described in this utility model;

[0020] Figure 3 This is a three-dimensional schematic diagram of one side of the contact cover described in this utility model;

[0021] Figure 4 This is a three-dimensional schematic diagram of the other side of the contact cover described in this utility model;

[0022] Figure 5 This is a three-dimensional schematic diagram of one side of the first insulating member described in this utility model;

[0023] Figure 6 This is a three-dimensional schematic diagram of the other side of the first insulating member described in this utility model;

[0024] Figure 7 This is a three-dimensional schematic diagram of one side of the second insulating member described in this utility model;

[0025] Figure 8 This is a three-dimensional schematic diagram of the other side of the second insulating member described in this utility model.

[0026] In the diagram: 1. Housing, 11. Base, 12. Base plate; 2. Contact system, 21. Moving contact, 211. Contact support, 212. Contact piece, 2121. Main contact piece, 2122. Arc contact piece, 213. Side plate, 2131. Snap-fit ​​groove, 214. Contact cover, 2141. Connecting part, 2142. Fin, 21421. Relief notch, 2143. Side wall, 21431. First snap-fit ​​boss, 21432. Second snap-fit ​​boss, 215. Insulating sealing element, 2151. First sealing element 21511. First plate, 21512. Flange, 21513. First fixing hole, 21514. First positioning groove, 21515. First recess, 21516. First clearance cavity, 2152. Second sealing member, 21521. Second plate, 21522. Second fixing hole, 21523. Second positioning groove, 21524. Second recess, 21525. Second clearance cavity, 216. Cable outlet, 217. Mounting base, 218. Hinge arm, 219. Rotating shaft, 22. Stationary contact. Detailed Implementation

[0027] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0028] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0029] Please see Figure 1 This utility model relates to a switch, which includes an isolating switch and a circuit breaker. Specifically, the switch includes a housing 1, which has a contact arc-extinguishing cavity. A contact system 2 is installed in the contact arc-extinguishing cavity. The arc-extinguishing chamber of the switch (not shown) is inserted into the contact arc-extinguishing cavity from the top opening of the contact arc-extinguishing cavity and is located above the contact system 2.

[0030] Furthermore, the housing 1 is assembled from a base 11 and a bottom plate 12. Typically, the base 11 and bottom plate 12 are fixed together by threaded fastening. The contact system 2 includes a moving contact 21 and a stationary contact 22. The moving contact 21 is mounted on the base 11, while the stationary contact 22 is mounted on the bottom plate 12. Specifically, the moving contact 21 is rotatably mounted, while the stationary contact 22 is fixedly mounted. Alternatively, the moving contact 21 and stationary contact 22 can be mounted on the same side of the housing 1, for example, both on the bottom plate 12. In this case, the base 11 can be considered a cover, covering the bottom plate 12.

[0031] like Figure 2 As shown, the moving contact 21 includes a contact support 211, contact pieces 212, and a contact cover 214. The contact support 211 includes a pair of side plates 213 mounted on both sides. The contact support 211 is made of an insulating material, such as thermosetting materials like DMC or BMC. The contact pieces 212 are rotatably mounted on the contact support 211 and include main contact pieces 2121 and arc contact pieces 2122 arranged side by side. Specifically, the arc contact pieces 2122 are located in the middle, while the main contact pieces 2121 are located on the left and right sides of the arc contact pieces 2122. More specifically, there is one set of arc contact pieces 2122, consisting of multiple pieces arranged side by side, while there are also multiple main contact pieces 2121, but they are divided into two groups, which are located on both sides of one set of arc contact pieces 2122. A pair of side plates 213 are respectively installed on the left and right sides of the contact support 211, providing mounting and positioning for other components of the moving contact 21. The side plates 213 are preferably metal side plates for better strength. A rotating shaft 219 passes through the contact piece 212 in the middle, and its two ends are rotatably mounted on the pair of side plates 213, thereby enabling the contact piece 212 to rotate relative to the side plates 213, and consequently, the contact piece 212 to rotate relative to the contact support 211. Alternatively, the two ends of the rotating shaft 219 can also be mounted on the contact support 211. The contact cover 214 is located on the side of the contact piece 212 facing the stationary contact 22 of the switch. The contact cover 214 is inserted from the front of the contact piece 212, i.e., from the side away from the contact support 211. The contact cover 214 is made of insulating material; preferably, it is made of thermoplastic material. The contact cover 214 is inserted into position from the front of the contact piece 212, and its two sides along its length (left and right sides) are engaged with the pair of side plates 213, thus completing the installation. This installation method replaces the original method of fastening the contact cover 214 with threaded parts, effectively improving installation efficiency.

[0032] See you later Figure 1 and Figure 2The moving contact 21 further includes a lead-out bar 216, a mounting base 217, and a hinge arm 218. The lead-out bar 216 is located at one end of the rotation center of the moving contact 21. The mounting base 217 is mounted on the lead-out bar 216 and fixed to the base 11 of the housing 1, thereby keeping the lead-out bar 216 fixed relative to the base 11. The lead-out bar 216 is electrically connected to one end of the contact piece 212 via a conductive flexible connection (not shown). One end of the hinge arm 218 is hinged to the contact support 211, specifically to the back of the contact support 211 away from the contact piece 212; the other end of the hinge arm 218 is connected to the operating mechanism of the switch (not shown). After the operating mechanism of the switch is activated, it drives the moving contact 21 to move via the hinge arm 218.

[0033] See Figure 3 and Figure 4 The contact cover 214 includes a connecting portion 2141, fins 2142, and a pair of sidewalls 2143. The connecting portion 2141 connects between the pair of sidewalls 2143, forming a "[" shape. The fins 2142 extend from the inside of the connecting portion 2141 toward the contact pieces 212 and are inserted between adjacent contact pieces 212. The fins 2142 are provided with clearance notches 21421 that open toward the rotating shaft 219, which are used to allow clearance from the rotating shaft 219. The pair of sidewalls 2143 are each provided with a first engaging boss 21431 on their inner side and a second engaging boss 21432 on their outer side.

[0034] See you later Figure 2 The side plate 213 has a snap-fit ​​groove 2131. When the contact cover 214 is installed on the moving contact 21, the front part of the side wall 2143 covers the outside of the side plate 213, the front part of the side wall 2143 snaps into the end of the side plate 213, and the first snap-fit ​​protrusion 21431 snaps into the snap-fit ​​groove 2131, completing the installation of the contact cover 214 and the side plate 213. Furthermore, the first snap-fit ​​protrusion 21431 can extend through the snap-fit ​​groove 2131 and snap onto the contact support 211.

[0035] Alternatively, the contact cover 214 can be engaged by the connecting portion 2141, that is, the connecting portion 2141 is engaged with the side plate 213 and / or the contact support 211. In this case, the contact cover 214 may no longer have a side wall 2143. For example, the side plate 213 and the contact support 211 may have openings, and both ends of the connecting portion 2141 may engage with these openings.

[0036] Similarly, the side wall 2143 of the contact cover 214 can also be snapped into the inside of the side plate 213. In this case, the side wall 2143 is located between the contact support 211 and the side plate 213. The side wall 2143 can be snapped onto the side plate 213 and / or the contact support 211. In this case, the snapping on the inside of the side wall 2143 is achieved by the first snapping boss 21431, while the snapping on the outside of the side wall 2143 is achieved by the second snapping boss 21432. In specific selection, the first snapping boss 21431 and the second snapping boss 21432 should be chosen according to actual needs.

[0037] Furthermore, each of the pair of side plates 213 is fitted with a separately molded insulating seal 215 to improve the insulation of the moving contact 21, i.e., to prevent the side plates 213 from breaking down with other metal components. In this description, "separately molded" means that the insulating seal 215 is not integrally molded with other components of the moving contact 21, such as the contact cover 214 or the contact support 211. However, the installation and mating relationship between the insulating seal 215 and other components of the moving contact 21 still falls within the scope of "separately molded" and is protected.

[0038] Specifically, the insulating sealing member 215 is a plate material, including a first sealing member 2151 and a second sealing member 2152. Both the first sealing member 2151 and the second sealing member 2152 are made of insulating material and are respectively installed on the two outer sides of a pair of side plates 213. The shape of the first sealing member 2151 matches a corresponding lateral recess on the contact support 211; the shape of the second sealing member 2152 matches a corresponding lateral recess on the contact support 211.

[0039] See you later Figure 2 The first sealing member 2151 is installed on the outer side of one of the pair of side plates 213, that is, the first sealing member 2151 covers the portion of the side plate 213. Preferably, the first sealing member 2151 covers the upper portion of the side plate 213 corresponding to the rotating end of the moving contact 21.

[0040] For details, see Figure 5 and Figure 6The first sealing member 2151 includes a first plate 21511, on which a first fixing hole 21513 and a first positioning groove 21514 are provided. Preferably, the first fixing hole 21513 is a circular hole and there are three of them, used to connect and fix the first sealing member 2151 to the corresponding side plate 213. The first positioning groove 21514 is a strip-shaped closed groove and is located close to the contact cover 214, used to cooperate with the contact cover 214 for installation. The first plate 21511 also forms a first recess 21515 and a first clearance cavity 21516 on the inner side facing the side plate 213. Preferably, there are three first recesses 21515, used to cover the screw caps of the screws on the corresponding side plate 213. The first clearance cavity 21516 is used for engaging the front portion of the side wall 2143 of the contact cover 214; therefore, the shape of the first clearance cavity 21516 needs to match the shape of the front portion of the side wall 2143. Furthermore, the first positioning groove 21514 is located within the area of ​​the first clearance cavity 21516.

[0041] The first sealing member 2151 also forms a flange portion 21512 on the side of the first plate 21511 and at the mounting location of the hinge arm 218. The flange portion 21512 matches the shape of the cavity on the corresponding side of the contact support 211, which can effectively prevent breakdown and achieve better insulation effect.

[0042] Still see Figure 2 The second sealing member 2152 is installed on the outside of the other side plate 213 of the pair of side plates 213, that is, the second sealing member 2152 covers the portion of the side plate 213. Preferably, the second sealing member 2152 covers the upper portion of the side plate 213 corresponding to the rotating end of the moving contact 21. To achieve better insulation, the shape of the second sealing member 2152 matches the lateral recess of the contact support 211, thereby effectively preventing breakdown.

[0043] For details, see Figure 7 and Figure 8The second sealing member 2152 includes a second plate 21521, on which a second fixing hole 21522 and a second positioning groove 21523 are provided. Preferably, the second fixing hole 21522 is a circular hole and there are three of them, used to connect and fix the second sealing member 2152 to the corresponding side plate 213. The second positioning groove 21523 is a strip-shaped closed groove and is located near the contact cover 214, used to cooperate with the contact cover 214 for installation. The second plate 21521 also forms a second recess 21524 and a second clearance cavity 21525 on the inner side facing the side plate 213. Preferably, there are three second recesses 21524, used to cover the screw caps of the screws on the corresponding side plate 213. The second clearance cavity 21525 is used for engaging the front portion of the side wall 2143 of the contact cover 214; therefore, the shape of the second clearance cavity 21525 needs to match the shape of the front portion of the side wall 2143. Furthermore, the second positioning groove 21523 is located within the area of ​​the second clearance cavity 21525.

[0044] Furthermore, in order to improve the installation effect of the contact cover 214 and at the same time improve the insulation of both sides of the moving contact 21 to prevent breakdown, this embodiment provides a first sealing member 2151 on both sides of the moving contact 21, that is, on the outside of one side plate 213 of a pair of side plates 213, and a second sealing member 2152 on the outside of the other side plate 213. Specifically, on one side of the moving contact 21, the first sealing member 2151 is fixed to the side plate 213 and covers the front part of the side wall 2143 of the contact cover 214. The second snap-fit ​​boss 21432 on the side wall 2143 is engaged in the first positioning groove 21514 on the first sealing member 2151, thereby enhancing the installation effect of the first sealing member 2151. On the other side of the moving contact 21, i.e., the side where the second sealing member 2152 is installed, the second sealing member 2152 is fixed to the side plate 213 and covers the front part of the side wall 2143. The second snap-fit ​​boss 21432 on the side wall 2143 is engaged in the second positioning groove 21523 on the second sealing member 2152.

[0045] Furthermore, to improve the insulation effect on both sides of the moving contact 21, an insulating layer can be applied to the side plate 213. Of course, referring to the above embodiment, the insulating layer may only be partially applied. Preferably, the insulating layer is applied to the upper portion of the side plate 213 corresponding to the rotating end of the moving contact 21. That is, the insulating layer can serve as one embodiment of the insulating sealing member 215.

[0046] In this invention, the side plate 213 is considered to be part of the contact support 211, and the snap-fit ​​structure between the contact cover 214, the contact support 211, and the side plate 213 included in the contact support 211 is collectively referred to as the locking connection structure.

[0047] The situation described above, where the contact cover 214 is snapped onto the side plate 213, can be achieved through structural interchange. Specifically, the locking connection structure includes one of a first snap-fit ​​boss 21431 and a snap-fit ​​groove 2131 located inside a pair of side walls 2143, while the side plate 213 has the other of the first snap-fit ​​boss 21431 and snap-fit ​​groove 2131, thus completing the snap-fit.

[0048] In another embodiment, the locking connection structure can be directly snapped onto the contact support 211.

Claims

1. A moving contact system for a switch, comprising a contact support (211), a contact piece (212), and a contact cover (214), wherein the contact piece (212) is rotatably disposed on the contact support (211), and the contact cover (214) is located on the side of the contact piece (212) facing the stationary contact (22) of the switch, characterized in that: The contact cover (214) is snapped onto the contact support (211) via a locking connection structure.

2. The moving contact system of a switch according to claim 1, characterized in that: The contact support (211) includes a pair of side plates (213), which are respectively disposed on the left and right sides of the contact support (211).

3. The moving contact system of a switch according to claim 2, characterized in that: The contact cover (214) includes a pair of sidewalls (2143) and a connecting portion (2141) connecting the pair of sidewalls (2143). When the contact cover (214) is installed on the moving contact (21) of the switch, the front part of the sidewall (2143) covers the outside of the side plate (213). The locking connection structure includes one of a first snap-fit ​​boss (21431) and a snap-fit ​​groove (2131) located inside the pair of sidewalls (2143). The side plate (213) has the other of the first snap-fit ​​boss (21431) and the snap-fit ​​groove (2131). The first snap-fit ​​boss (21431) engages with the snap-fit ​​groove (2131).

4. The moving contact system of a switch according to claim 2, characterized in that: The contact cover (214) includes a pair of sidewalls (2143) and a connecting portion (2141) connecting the pair of sidewalls (2143). When the contact cover (214) is installed on the moving contact (21) of the switch, the front part of the sidewall (2143) covers the outside of the side plate (213). The side plate (213) is provided with a snap-fit ​​groove (2131). The locking connection structure includes a first snap-fit ​​boss (21431) located inside the pair of sidewalls (2143). The first snap-fit ​​boss (21431) passes through the snap-fit ​​groove (2131) and is secured to the contact support (211).

5. The moving contact system of a switch according to claim 2, characterized in that: The contact cover (214) includes a pair of sidewalls (2143) and a connecting portion (2141) between the pair of sidewalls (2143), the sidewalls (2143) being snapped between the inside of the side plate (213) and the outside of the contact support (211).

6. The moving contact system of a switch according to claim 3, characterized in that: It also includes an insulating sealing member (215), which is a plate and includes a first sealing member (2151) and a second sealing member (2152). The first sealing member (2151) and the second sealing member (2152) are respectively installed on the two outer sides of a pair of side plates (213) and cover the front of the side wall (2143).

7. The moving contact system of a switch according to claim 6, characterized in that: The pair of sidewalls (2143) have a second snap-fit ​​boss (21432) formed on their outer surfaces. The first sealing member (2151) has a first positioning groove (21514), and the second sealing member (2152) has a second positioning groove (21523). When the pair of sidewalls (2143) are installed in conjunction with the first sealing member (2151) and the second sealing member (2152), the second snap-fit ​​boss (21432) on one side of the pair of sidewalls (2143) snaps into the first positioning groove (21514), while the second snap-fit ​​boss (21432) on the other side snaps into the second positioning groove (21523).

8. The moving contact system of a switch according to claim 7, characterized in that: The first sealing member (2151) has a first clearance cavity (21516) on the inner side facing the side plate (213), and the first positioning groove (21514) is located in the area of ​​the first clearance cavity (21516). The second sealing member (2152) also has a second clearance cavity (21525) on the inner side facing the side plate (213), and the second positioning groove (21523) is located in the area of ​​the second clearance cavity (21525). The first clearance cavity (21516) and the second clearance cavity (21525) are respectively used for the front parts of the pair of side walls (2143) to be engaged.

9. The moving contact system of a switch according to claim 6, characterized in that: The first sealing member (2151) is also provided with a first fixing hole (21513) for connecting with one of the pair of side plates (213); the second sealing member (2152) is also provided with a second fixing hole (21522) for connecting with the other side plate (213).

10. A moving contact system for a switch according to claim 3 or 4, characterized in that: The contact cover (214) further includes a plurality of fins (2142) arranged side by side at intervals, the fins (2142) extending from the inside of the connecting portion (2141) toward the contact piece (212) and inserted between adjacent contact pieces (212).

Images