Three-position switch major loop structure and direct-acting three-position switch

Abstract

The utility model relates to the field of circuit breakers with linear motion contacts, provides a main loop structure of a three-position switch and a direct-acting three-position switch, and aims to solve the problem that the creepage distance of the direct-acting three-position switch in the prior art affects the overall length of equipment, an insulation connecting piece between a middle contact seat and an isolation contact seat is improved. According to the direct-acting type three-position switch, the groove-shaped structure extending downwards is arranged on the insulating connecting piece, the creepage distance is increased on the premise that the distance between the isolating contact and the middle contact is not changed, and the problem that the creepage distance of a direct-acting type three-position switch in the prior art needs to be changed by changing the overall length of equipment is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit breaker with linear motion contact, especially to a three-position switch main circuit structure and direct-acting three-position switch. BACKGROUND

[0002] Three-position switch is a kind of switch with closing position, isolation position and grounding position, three-position switch integrates the function of isolating switch and grounding switch, and the conversion of position is completed by a moving contact;There is a direct-acting three-position switch in prior art, isolation contact seat, grounding contact seat and moving contact are arranged on the same axis, the working state of three-position switch is controlled by controlling the movement of moving contact along the axis, due to the characteristics of uniform electric field distribution and excellent insulation performance, direct-acting three-position switch is widely used in gas-filled switch cabinet;But due to the linear structure of direct-acting three-position switch, the centering requirement between moving contact and contact seat is high when switch is opened and closed, if there is angle deviation between moving contact and contact seat, friction and collision will occur between moving contact and two contact seats, causing circuit system failure.

[0003] In order to improve the centering between the above three contacts, a direct-acting three-position switch is provided in the Chinese utility model patent with publication number CN210722857U, upper and lower contact seats and middle contact seat are arranged on the same axis, isolation contact and grounding contact are respectively installed in upper and lower contact seats, moving contact is slidably installed in middle contact seat, the butt joint with isolation contact and grounding contact is realized by the up-down movement of moving contact along the axis, wherein, middle contact seat and upper contact seat are connected together through insulation connecting piece and take insulation connecting piece as the centering element for ensuring the height centering between middle contact seat and upper contact seat;Middle contact seat and upper contact seat can also be integrally casted by using epoxy resin, the centering of middle contact seat and upper contact seat is ensured in the mold and the epoxy resin part formed by casting is taken as insulation connecting piece, the height centering between middle contact seat and upper contact seat can be ensured by the two schemes.

[0004] But the problem of prior art is that, if isolation contact seat is arranged at the position of upper contact seat in three-position switch in prior art, isolation contact seat and middle contact seat are connected through integrated insulation connecting piece, if there is dirt on the surface of insulation connecting piece, when there is potential difference between isolation contact seat and middle contact seat, conduction current will be generated on the surface of insulation connecting piece, that is, creepage phenomenon, which affects the safety of power system, and isolation contact seat and middle contact seat in three-position switch of prior art are arranged at the middle position of insulation connecting piece, and the bottom of insulation connecting piece is provided with horizontal mounting arm matched with plane support frame, the creepage distance of insulation connecting piece arranged in this way is consistent with the spacing between middle contact seat and isolation contact seat;When the length of mounting arm is lengthened to increase the creepage distance, the spacing between middle contact seat and isolation contact seat is increased synchronously, which increases the overall length of equipment. Utility model content

[0005] The utility model discloses a three position switch main circuit structure, to solve the problem of the overall length of the equipment must be increased in the direct-acting three position switch of prior art because of the extension of the creepage distance, and the utility model also discloses a three position switch to solve the above technical problem.

[0006] To solve the above technical problem, the utility model provides a direct-acting three position switch contact connection support, including intermediate contact seat, isolation contact seat and the insulating connecting piece for coaxially fixed intermediate contact seat and isolation contact seat, the insulating connecting piece has the concave structure of downward extension, and the intermediate contact seat and isolation contact seat are installed at the upper end of insulating connecting piece.

[0007] Further, the inner side wall surface of the concave structure of insulating connecting piece is provided with the insulating spacer rib for extending the creepage distance below the intermediate contact seat and isolation contact seat.

[0008] Further, the insulating spacer rib is more than two and is arranged along the centering axis of the intermediate contact seat and isolation contact seat in parallel, and the insulating spacer rib is perpendicular to the centering axis of the intermediate contact seat and isolation contact seat.

[0009] Further, the concave structure includes the bottom straight section of transverse extension and the support arm of oblique upward extension connected at the both ends of bottom straight section, and the mounting arm of the intermediate contact seat and isolation contact seat is connected with the upper end of two support arms respectively.

[0010] Further, the intermediate contact seat, isolation contact seat and insulating connecting piece are integrated structure, and the insulating connecting piece is the epoxy resin cast molding piece.

[0011] Further, the insulating spacer rib is vertically arranged on the inner side bottom surface of the concave structure of insulating connecting piece.

[0012] Further, the insulating spacer rib is divided into two groups along the centering axis of the intermediate contact seat and isolation contact seat, and the bottom of insulating connecting piece is further provided with grounding insert between two groups of insulating spacer ribs.

[0013] Further, the reinforcing rib plate is arranged between the inner side wall surface of the concave structure of two groups of insulating spacer ribs and the corresponding concave structure.

[0014] Further, the bottom of insulating connecting piece is provided with the bottom plane for fixedly abutting with switch mounting part, and the lower surface of above-mentioned grounding insert is flush with the bottom plane.

[0015] Further, the grounding insert is metal sleeve, and the step hole is formed in the metal sleeve, and the end face of the small diameter section of step hole is flush with the bottom plane.

[0016] Further, the inner side wall surface bottom of the concave structure of the insulating connecting piece is further provided with an inner side plane, and the metal sleeve is sunk in the inner side plane; the inner side plane is further provided with an avoiding hole penetrating the inner hole of the stepped hole of the metal sleeve.

[0017] Beneficial effects:

[0018] The utility model improves the electric circuit containing isolation contact seat and intermediate contact seat in prior art direct action three position switch, provides a three position switch main circuit structure, sets up the concave structure of downward extension on the insulating connecting piece for coaxial fixing intermediate contact seat and isolation contact seat, sets up intermediate contact seat and isolation contact seat at the upper end of insulating connecting piece, prolongs the creepage distance under the condition of keeping the interval of intermediate contact seat and isolation contact seat unchanged through the insulating connecting piece with concave structure, reduces the risk of power system damage caused by the creepage on the insulating support, solves the problem of the overall length of equipment must be increased due to the prolongation of creepage distance in prior art direct action three position switch.

[0019] To solve the above technical problems, the utility model provides a direct action three position switch, including ground contact seat, movable contact and isolation switch circuit structure, wherein, isolation switch circuit structure, including intermediate contact seat, isolation contact seat and insulating connecting piece for coaxial fixing intermediate contact seat and isolation contact seat, the insulating connecting piece has the concave structure of downward extension, and intermediate contact seat and isolation contact seat are installed at the upper end of insulating connecting piece.

[0020] Further, the inner side wall surface of the concave structure of the insulating connecting piece is provided with an insulating spacer below the intermediate contact seat and the isolation contact seat for extending the creepage distance.

[0021] Further, the insulating spacer is more than two and is arranged in parallel along the center axis of the intermediate contact seat and the isolation contact seat, and the insulating spacer is perpendicular to the center axis of the intermediate contact seat and the isolation contact seat.

[0022] Further, the concave structure includes a bottom straight line segment extending horizontally and a support arm extending upwardly and obliquely connected to both ends of the bottom straight line segment, and the mounting arm where the intermediate contact seat and the isolation contact seat are located is connected to the upper end of the two support arms, respectively.

[0023] Further, the intermediate contact seat, the isolation contact seat and the insulating connecting piece are an integrated structure, and the insulating connecting piece is an epoxy resin cast molding piece.

[0024] Further, the insulating spacer is vertically arranged on the inner bottom surface of the concave structure of the insulating connecting piece.

[0025] Further, the insulating spacer is divided into two groups along the center axis of the intermediate contact seat and the isolation contact seat, and the bottom of the insulating connecting piece is further provided with a grounding insert between the two groups of insulating spacers.

[0026] Further, the two groups of insulation partitioning ribs are provided with reinforcing rib plates between the inner side wall surfaces of the corresponding concave structures.

[0027] Further, the bottom of the insulation connecting piece is provided with a bottom plane for fixedly abutting with the switch mounting piece, and the lower surface of the grounding insert is flush with the bottom plane.

[0028] Further, the grounding insert is a metal sleeve, and a stepped hole is formed in the metal sleeve, and the end surface of the small-diameter section of the stepped hole is flush with the bottom plane.

[0029] Further, the inner side wall surface of the concave structure of the insulation connecting piece is further provided with an inner side plane, and the metal sleeve is sunk in the inner side plane; and the inner side plane is further provided with an avoiding hole corresponding to the inner hole of the stepped hole of the metal sleeve.

[0030] Beneficial effects:

[0031] The utility model improves the electric circuit containing the isolation contact seat and the intermediate contact seat in the direct action type three position switch of prior art, provides a direct action type three position switch, sets down the concave structure on the insulation connecting piece for coaxially fixing the intermediate contact seat and the isolation contact seat, sets up the intermediate contact seat and the isolation contact seat at the upper end of the insulation connecting piece, prolongs the creepage distance through the insulation connecting piece with the concave structure under the condition of keeping the interval between the intermediate contact seat and the isolation contact seat unchanged, reduces the risk of causing the damage of power system due to the creepage on the insulation support, solves the problem that in the direct action type three position switch of prior art, the overall length of equipment must be changed when the creepage distance is changed. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is whole assembly structure schematic view of three position switch main circuit structure;

[0033] Figure 2 It is main view of three position switch main circuit structure;

[0034] Figure 3 It is main view cross section structure schematic view of three position switch main circuit structure;

[0035] Figure 4 It is main view cross section structure schematic view of intermediate contact seat;

[0036] Figure 5 It is side view structure schematic view of intermediate contact seat;

[0037] Figure 6 It is main view structure schematic view of isolation contact seat;

[0038] Figure 7 It is side view cross section structure schematic view of isolation contact seat;

[0039] Figure 8The sectional structure diagram of the grounding insert;

[0040] Figure 9 The sectional view of the direct-acting three-position switch overall assembly structure configured with the three-position switch main circuit structure.

[0041] In the figure: 1, insulation connecting piece; 11, insulation partition rib; 12, connecting arm; 13, reinforcing rib plate; 14, support arm; 15, mounting arm; 16, avoiding hole; 2, isolation contact seat; 3, intermediate contact seat; 32, key; 4, grounding insert; 41, stepped hole; 5, moving contact; 6, rotating driving device; 61, insulation screw; 62, chain wheel; 63, transmission rod; 7, mounting plate; 8, insulation sleeve; 9, spring contact finger; 10, grounding contact seat. DETAILED DESCRIPTION

[0042] The features and performances of the utility model are further described in detail in combination with the embodiments.

[0043] The principle and concept of the utility model are that, aiming at the electrical circuit containing the isolation contact seat and the intermediate contact seat in the prior art direct-acting three-position switch, the insulation connecting piece used to fix the intermediate contact seat and the isolation contact seat coaxially is improved, the concave structure extending downward is arranged on the insulation connecting piece, the creepage distance is lengthened without changing the interval of the isolation contact seat and the intermediate contact seat, and the problem that the overall length of the equipment must be changed to change the creepage distance in the prior art direct-acting three-position switch is solved.

[0044] On the basis of the above principle and concept, the utility model provides a three-position switch main circuit structure and various embodiments thereof for further explanation and illustration.

[0045] On the basis of the above principle, in a basic embodiment, such as the embodiment provided in the utility model, Figures 1-8 the three-position switch main circuit structure comprises the intermediate contact seat 3, the isolation contact seat 2 and the insulation connecting piece 1 used to connect the intermediate contact seat 3 and the isolation contact seat 2, the concave structure extending downward is further arranged on the insulation connecting piece 1, the inner side wall surface of the concave structure serves as the creepage surface, the creepage distance is lengthened without changing the interval of the intermediate contact seat 3 and the isolation contact seat 2, the risk of the creepage on the surface of the insulation connecting piece 1 is reduced, and the problem that the overall length of the equipment must be changed to change the creepage distance in the prior art direct-acting three-position switch is solved.

[0046] On the basis of the above embodiment, in an embodiment, such as the embodiment provided in the utility model, Figures 1-8In the provided embodiment, an insulation partition 11 is arranged on the inner side wall of the concave structure of the insulation connecting piece 1 below the intermediate contact 3 and the isolation contact 2, and the insulation partition 11 partitions the inner side wall of the concave structure. By arranging the insulation partition 11 on the inner side wall of the concave structure, the creepage distance is extended on the basis of the original concave structure.

[0047] On the basis of the above-mentioned embodiments, in one embodiment, as Figures 1-8 In the provided embodiment, the insulation connecting piece 1 comprises a connecting arm 12, the connecting arm 12 has a horizontally extending bottom linear segment, the two ends of the bottom linear segment are respectively provided with a support arm 14 extending upwardly and obliquely, and a vertical upwardly extending connecting arm 12 is further arranged on the support arm 14 at the two ends of the bottom linear segment. The above-mentioned intermediate contact 3 and the isolation contact 2 are respectively arranged on the mounting arm 15 at the two ends of the bottom linear segment. The above-mentioned grounding insert 4 is arranged on the connecting arm 12. The connecting arm 12, the two support arms 14 and the two mounting arms 15 constitute the above-mentioned insulation connecting piece 1 with the concave structure extending downwardly. The upper surface of the connecting arm 12, the inner side surface of the two support arms 14 and the side surface of the two mounting arms 15 form the inner side wall of the above-mentioned concave structure. The above-mentioned insulation partitions 11 are vertically arranged on the inner side wall of the concave structure and are perpendicular to the central axes of the intermediate contact 3 and the isolation contact 2.

[0048] By arranging the connecting arm 12 at the bottom and the support arm 14 and the mounting arm 15 on the connecting arm 12, the distance between the intermediate contact 3 and the isolation contact 2 and the grounding insert 4 is increased, and the possibility of the intermediate contact 3 and the isolation contact 2 discharging to the tip of the grounding insert 4 is reduced. The two insulation partitions 11 are arranged on the upper surface of the connecting arm 12, and a reinforcing rib plate 13 is further arranged between the insulation partition 11 and the support arm 14 to strengthen the structural strength of the insulation connecting piece 1.

[0049] The insulation connecting piece 1 with the channel-shaped cross section has a smaller volume and can be applied to a gas tank with a relatively compact installation structure under the condition that the creepage distance meets the requirements. In another embodiment, the insulation connecting piece 1 can also have a bowl-shaped cross section. The insulation connecting piece 1 arranged in this way can provide a longer creepage distance and better insulation performance.

[0050] When the insulation connecting piece 1 has a channel-shaped cross section as Figure 1 shown, in another embodiment, the insulation partition 11 can also be arranged below the isolation contact 2 and the intermediate contact 3 and perpendicular to the mounting arm 15. The insulation partition 11 can also be arranged on the inner side wall of the concave structure and perpendicular to the support arm 14. In another embodiment, the insulation connecting piece 1 has an arc-shaped cross section. At least two insulation partitions 11 can be arranged below the isolation contact 2 and the intermediate contact 3 along any radial direction of the bowl-shaped structure.

[0051] On the basis of the above-mentioned embodiments, in one embodiment, as provided in the above-mentioned embodiments, the intermediate contact seat 3, the isolation contact seat 2 and the insulating connecting piece 1 are of an integrated structure, and are formed by pouring and molding with epoxy resin. The intermediate contact seat 3 and the isolation contact seat 2 are placed in the epoxy resin pouring mold and kept coaxial in advance, and the epoxy resin piece after pouring and molding constitutes the above-mentioned insulating connecting piece 1. The integrally formed insulating connecting piece 1 has higher structural strength, thereby ensuring the overall structural stability of the three-position switch main circuit structure. Figures 1-8

[0052] On the basis of the above-mentioned embodiments, in one embodiment, as provided in the above-mentioned embodiments, the insulating partition rib 11 is vertically arranged on the inner side wall surface of the concave structure, and the vertically arranged insulating partition rib 11 has a vertical side surface, on which conductive dirt is not easy to accumulate, thereby enhancing the insulation performance of the insulating connecting piece 1. At the same time, the vertically arranged insulating partition rib 11 is convenient for demolding after pouring and molding. Figures 1-8

[0053] On the basis of the above-mentioned embodiments, in one embodiment, as provided in the above-mentioned embodiments, two groups of insulating partition ribs 11 are arranged on the center axis of the intermediate contact seat 3 and the isolation contact seat 2, and a grounding insert 4 is further arranged between the two groups of insulating partition ribs 11. The insulating connecting piece 1 with the grounding insert 4 arranged therein can lead part of the creeping electric field on the insulating connecting piece 1 to the grounding row, thereby enhancing the insulation performance of the insulating connecting piece 1. Figures 1-8

[0054] On the basis of the above-mentioned embodiments, in one embodiment, as provided in the above-mentioned embodiments, two groups of insulating partition ribs 11 arranged perpendicularly to the coaxial axis of the intermediate contact seat 3 and the isolation contact seat 2 and the inner side wall surface of the corresponding concave structure are further provided with reinforcing rib plates, thereby further enhancing the structural strength of the insulating connecting piece 1, preventing the insulating connecting piece 1 from shrinking and deforming during the process of cooling and solidification after injection molding, and further preventing the intermediate contact seat 3 and the isolation contact seat 2 from being no longer coaxial. Figures 1-8

[0055] On the basis of the above-mentioned embodiments, in one embodiment, as provided in the above-mentioned embodiments, the bottom of the insulating support piece 1 is provided with a bottom plane for fixedly abutting and fixing with the bottom of the switch mounting piece. The lower surface of the grounding insert 4 is flush with the bottom plane. The bottom plane arranged at the bottom of the insulating support piece 1 can more stably install the three-position switch main circuit structure on the mounting surface of the switch mounting piece, thereby enhancing the overall structural stability of the three-position switch main circuit structure. In another embodiment, the bottom of the inner side surface of the concave structure of the insulating support piece 1 is provided with an inner plane, the upper surface of the grounding insert 4 is flush with the inner plane, and the lower surface of the grounding insert 4 is sunken in the bottom of the insulating support piece 1. Figures 1-8

[0056] ​​​​​Based on the above embodiments, in one embodiment, such as Figures 1-8 In the provided embodiment, the grounding insert 4 is a metal sleeve installed on the bottom plane of the insulating connector 1. The metal sleeve also has a stepped hole 41, and the end face of the stepped hole 41 is flush with the bottom plane of the connecting arm 12. In another embodiment, the grounding insert 4 can also be a metal block embedded in the bottom plane of the insulating connector 1. The lower side of the metal block has a threaded hole. The fixing and grounding of the insulating connector on the mounting panel is achieved by the cooperation of the screw passing through the mounting panel and the threaded hole.

[0057] Based on the above embodiments, in one embodiment, such as Figures 1-8 In the provided embodiment, the bottom straight section of the connecting arm 12 also has a top plane. The metal sleeve, which serves as the grounding insert 4, is recessed within the top plane. The bottom straight section is also provided with a clearance hole 16 corresponding to the position of the stepped hole 41 on the metal sleeve. This clearance hole 16 is used to hide the bolt head when the bolt passes through the stepped hole and the three-position switch main circuit is installed on the switch mounting piece. The clearance hole 16, which is provided to accommodate the bolt head, can prevent the intermediate contact 3 or the isolation contact 2 from generating a tip discharge between the bolt head and the bolt head, thereby improving the overall safety of the three-position switch main circuit structure.

[0058] This utility model also provides a direct-acting three-position switch and various embodiments thereof for further explanation.

[0059] Based on the above embodiments, in one embodiment, such as Figure 9 The provided embodiments include a direct-acting three-position switch, such as... Figure 9 As shown, the device includes a grounding contact 10, a moving contact 5, and a disconnecting switch circuit structure. This disconnecting switch circuit structure is the main circuit structure of the three-position switch described in any of the above embodiments, which will not be elaborated further here. The intermediate contact 3 and the disconnecting contact 2 are cast into an integrated structure by epoxy resin casting process. The epoxy resin connector formed by casting constitutes the insulating connector 1 connecting the intermediate contact 3 and the disconnecting contact 2. The direct-acting three-position switch also includes a grounding contact 10 fixed on the mounting plate 7 and a moving contact 5 guided and inserted into the intermediate contact 3.

[0060] The ground contact seat 10 is further provided with a mounting hole penetrating the ground contact seat 10 along the centering axis of the isolation contact seat 2, the intermediate contact seat 3 and the ground contact seat 10; the direct-acting three-position switch further comprises a push-pull device for pushing and pulling the moving contact 5, the push-pull device comprises a sprocket 62 for providing torque, the sprocket 62 is further inserted with a transmission rod 63, the part of the transmission rod 63 inserted in the sprocket 62 is provided with a key groove and is fixedly installed with a key, the inner wall of the insertion hole of the sprocket 62 for inserting the transmission rod 63 is further provided with a key groove, the rotation is realized by matching the key groove on the sprocket 62 with the key on the transmission rod 63, the other end of the transmission rod 63 is fixedly provided with an insulating screw rod 61, the moving contact 5 is provided with a threaded hole matched with the insulating screw rod 61, the inner wall of the through hole of the intermediate contact seat 3 is provided with a key groove consistent with the length of the intermediate contact seat 3, the outer side wall of the moving contact 5 is provided with a key groove and is fixedly installed with a key, the rotation of the moving contact 5 is realized by matching the key groove on the intermediate contact seat 3 with the key installed on the moving contact 5, the insulating screw rod 61 penetrates the mounting hole on the ground contact seat 10 and drives the moving contact 5 to move along the centering axis of the isolation contact seat 2, the intermediate contact seat 3 and the ground contact seat 10, so as to realize the position conversion of the three-position switch; the moving contact 5 is further provided with a spring contact finger 9 to increase the contact area of the moving contact 5 and the isolation contact seat 2 and the ground contact seat 10, so as to ensure the reliability of the electrical connection.

[0061] The three-position switch main circuit structure and the direct-acting three-position switch improve the insulating connecting piece 1 for coaxially fixing the isolation contact seat 2 and the intermediate contact seat 3, the recess structure extending downward is arranged on the insulating connecting piece 1, the creepage distance is prolonged, meanwhile, the ground insert can guide part of the conduction current generated on the insulating connecting piece to the ground, so as to solve the problem that the overall length of the equipment must be increased due to the prolonged creepage distance in the direct-acting three-position switch of the prior art.

[0062] The above is only a preferred embodiment of the utility model, and does not limit the utility model, the patent protection scope of the utility model is subject to the claims, and equivalent structural changes made by referring to the contents of the specification and the drawings of the utility model should also be included in the protection scope of the utility model.

Claims

1. A three-position switch main circuit structure comprising a middle contact seat, an isolation contact seat and an insulating connecting piece for coaxially fixing the middle contact seat and the isolation contact seat, characterized in that, The insulating connecting piece has a concave structure extending downward, and the intermediate contact holder and the isolation contact holder are installed at the upper end of the insulating connecting piece.

2. The main circuit structure of a three-position switch according to claim 1, characterized in that, An insulating spacer rib is arranged on the inner side wall surface of the concave structure of the insulating connecting piece below the intermediate contact holder and the isolation contact holder to extend the creepage distance.

3. The three-position switch main circuit structure according to claim 2, characterized in that, The insulating spacer rib is more than two and is arranged along the center axis of the intermediate contact holder and the isolation contact holder, and the insulating spacer rib is perpendicular to the center axis of the intermediate contact holder and the isolation contact holder.

4. A three-position switch main circuit structure according to any one of claims 1 to 3, characterized in that, The concave structure comprises a transversely extending bottom straight segment and a support arm extending upward and obliquely connected to both ends of the bottom straight segment, and the installation arm where the intermediate contact holder and the isolation contact holder are arranged is connected to the upper end of the two support arms.

5. A three-position switch main circuit structure according to claim 2 or 3, characterized in that, The intermediate contact holder, the isolation contact holder and the insulating connecting piece are integrated, and the insulating connecting piece is an epoxy resin cast molding piece.

6. A three-position switch main circuit structure according to claim 5, characterized in that, The insulating spacer rib is vertically arranged on the inner bottom surface of the concave structure of the insulating connecting piece.

7. A three-position switch main circuit structure according to claim 6, characterized in that, The insulating spacer rib is divided into two groups along the center axis of the intermediate contact holder and the isolation contact holder, and the bottom of the insulating connecting piece is further provided with a grounding insert between the two groups of insulating spacer ribs.

8. A three-position switch main circuit structure according to claim 7, characterized in that, The two groups of insulating spacer ribs are provided with reinforcing rib plates between the inner side wall surfaces of the corresponding concave structures.

9. A three-position switch main circuit structure according to claim 8, characterized in that, The bottom of the insulating connecting piece is provided with a bottom plane for fixedly abutting with the switch mounting piece, and the lower surface of the grounding insert is flush with the bottom plane.

10. The three-position switch main circuit structure according to claim 9, characterized in that, The grounding insert is a metal sleeve, and a stepped hole is formed in the metal sleeve, and the end surface of the small diameter section of the stepped hole is flush with the bottom plane.

11. A three-position switch main circuit structure according to claim 10, characterized in that, The inner side plane is further arranged at the bottom of the inner side wall surface of the concave structure of the insulating connecting piece, and the metal sleeve is sunk in the inner side plane; and an avoiding hole corresponding to the inner hole of the stepped hole of the metal sleeve is further arranged on the inner side plane.

12. A direct-acting three-position switch comprising a grounded contact, a movable contact, and a disconnector circuit structure, characterized by The isolating switch circuit structure is the three-position switch main circuit structure of any one of claims 1-11.

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