Isolation switch moving contact, contact base assembly and three-position switch

Abstract

The invention relates to the field of high-voltage air circuit breaker parts without arc extinguishing or arc preventing devices, in particular to an isolating switch moving contact, a contact base assembly and a three-position switch. The three-position switch comprises a contact and contact seat assembly, the contact and contact seat assembly comprises an isolating switch moving contact, the isolating switch moving contact comprises a moving contact body, guide protection heads are arranged at the two ends of the moving contact body respectively, and the diameter of each guide protection head is larger than that of the moving contact body. One end of the guide protection head, which is deviated from the moving contact body, is provided with a plug-in guide surface, and the plug-in guide surface is used for being matched with an inner hole opening of a jack of the isolation static contact or the grounding static contact; and an avoiding groove corresponding to the guide groove is formed in the peripheral surface of the guide protection head and corresponds to the end part of the guide block. The isolating switch moving contact can solve the problems that an existing isolating switch moving contact is damaged due to abrasion in use, and the manufacturing cost is high.

Description

Technical Field

[0001] The invention relates to the field of high-voltage air circuit breaker parts without arc extinguishing or arc protection devices, and in particular to a disconnector movable contact and contact seat assembly and a three-position switch. Background Art

[0002] The three-position switch integrates the functions of the isolating switch and the grounding switch. The switch is opened and closed by moving the moving contact of the isolating switch. Since the moving contact of the isolating switch can only be in one position in the three-position switch, it can achieve mechanical locking to prevent misoperation and improve the safety and reliability of the power system. On the other hand, the three-position switch also has the advantages of simple structure, long service life and low cost. Due to the above advantages, the three-position switch is widely used in fully enclosed combination electrical appliances or composite electrical appliances.

[0003] Existing three-position switches usually use a direct-acting screw nut structure to drive the moving contact of the isolating switch to switch the closing position, the isolating position, and the grounding position. For example, a direct-acting three-position switch provided in the Chinese invention patent application with application publication number CN118522593A includes an intermediate contact, a movable contact, and an insulating screw rod. The movable contact is provided with an internal thread matching the insulating screw rod thread. A linear guide mechanism is provided between the intermediate contact and the movable contact. The linear guide mechanism includes a guide screw hole provided on the intermediate contact and a strip guide groove provided on the outer wall of the movable contact. A guide bolt is provided in the insulating screw hole, and the end of the guide bolt is located in the strip guide groove. When the insulating screw rod rotates to drive the movable contact to guide and move, the linear guide mechanism of the three-position switch limits the rotation of the movable contact, so that the movable contact is guided to move back and forth in the axial direction of the intermediate contact.

[0004] However, during the switching process of the three-position switch of the device, one end of the movable contact will leave the middle moving contact seat, move toward the static contact seat and insert into the static contact seat. Since the end of the movable contact that has left is in a suspended state during the movement toward the static contact seat, the suspended end of the movable contact is easily deflected downward under the action of gravity. When the downwardly deflected end is inserted into the static contact seat, the moving contact of the switch and the static contact seat are easily scratched. Too many scratches will damage the moving contact of the switch and affect the working performance of the moving contact of the switch. In addition, since the end of the moving contact of the switch inserted into the static contact seat is deflected downward, after being inserted into the static contact seat, the contact fingers above the static contact seat are difficult to fully contact with the contact fingers above the moving contact of the switch, resulting in insufficient conductive efficiency. In order to meet the conductive efficiency, the number of contact fingers needs to be increased. Since the contact fingers contain precious metals, the large number of contact fingers leads to high manufacturing costs. Summary of the invention

[0005] The object of the present invention is to provide a movable contact of an isolating switch, so as to solve the problem that the movable contact of the existing isolating switch is subject to wear and tear during use, resulting in damage, and has high manufacturing cost.

[0006] Another object of the present invention is to provide a contact seat assembly to solve the problem that the movable contact of the isolating switch of the existing contact seat assembly may be worn and damaged during use and the manufacturing cost is high.

[0007] The present invention also aims to provide a three-position switch to solve the problem that the movable contact of the isolating switch of the contact seat assembly of the existing three-position switch is subject to wear and tear during use, resulting in damage and the manufacturing cost is high.

[0008] In order to solve the above problems, the movable contact of the isolating switch of the present invention adopts the following technical solutions: The present invention provides a moving contact of an isolating switch, the moving contact of the isolating switch comprising a moving contact body, plugging sections for plugging with an isolating static contact and a grounding static contact are respectively arranged at both ends of the moving contact body, contact fingers are arranged on the plugging sections, a guide block extending along the length direction of the moving contact body is also arranged on the moving contact body, a guide groove for cooperating with a stop screw on a moving contact seat is arranged on the guide block, guide protection heads are respectively arranged at both ends of the moving contact body, the diameter of the guide protection head is larger than the diameter of the moving contact body, and smaller than the outer diameter of the corresponding contact finger and the inner diameter of the isolating static contact or the grounding static contact, a plugging guide surface is arranged at one end of the guide protection head facing away from the moving contact body, the plugging guide surface is used to cooperate with the inner hole of the socket of the isolating static contact or the grounding static contact to guide the moving contact body to be inserted into the isolating static contact or the grounding static contact, and an avoidance groove corresponding to the guide groove is also arranged on the outer peripheral surface of the guide protection head corresponding to the end of the guide block.

[0009] Furthermore, the plug-in guide surface is formed by a chamfered surface provided at the end of the guide protection head.

[0010] Furthermore, the guide protection head comprises a circular ring-shaped sleeve and a support plate arranged in the sleeve. The support plate is located between two ends of the sleeve and has an avoidance hole in the middle for avoiding the lead screw.

[0011] Furthermore, the guide protection head is sleeved on the corresponding end of the moving contact body and is interference fit with the moving contact body, and the support plate constitutes a limit plate of the corresponding end of the moving contact body.

[0012] Furthermore, a plurality of weight-reducing holes are arranged on the support plate around the avoidance hole.

[0013] Furthermore, the contact finger is a watch strap contact finger.

[0014] Furthermore, the chamfer forming the chamfered surface is a C chamfer.

[0015] Beneficial effects: The present invention provides an improved moving contact of an isolating switch. Compared with the prior art, the present device is equipped with a guide protection head, which combines guiding and supporting functions in one. On the one hand, the plug-in guide surface arranged on the guide protection head can guide the insertion of the moving contact of the isolating switch at the beginning of the contact between the moving contact of the isolating switch and the isolating static contact or the grounding static contact, so that the scratch between the suspended end of the moving contact of the isolating switch and the isolating static contact or the grounding static contact occurs at the guide protection head, thereby avoiding damage to the moving contact body. On the other hand, since the diameter of the guide protection head is larger than the diameter of the moving contact body and smaller than the diameter of the contact fingers, the guide protection head can support the moving contact of the isolating switch after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, thereby ensuring the coaxiality of the moving contact of the isolating switch with the isolating static contact or the grounding static contact after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, so that the contact fingers on the moving contact of the isolating switch are in full contact with the contact fingers on the isolating static contact or the grounding static contact, thereby improving the conductive efficiency. Therefore, the number of contact fingers on the moving contact body of the moving contact of the isolating switch can be reduced, and the cost of making the contact fingers can be reduced. The avoidance groove arranged on the guide protection head also avoids the interference of the stop screw with the guiding movement of the guide protection head.

[0016] The contact seat assembly of the present invention adopts the following technical solutions: The present invention provides a contact seat assembly, which comprises a movable contact of an isolating switch and a movable contact seat. The movable contact of the isolating switch comprises a movable contact body, plugging sections for plugging with an isolating static contact and a grounding static contact are respectively arranged at both ends of the movable contact body, contact fingers are arranged on the plugging sections, a guide block extending along the length direction of the movable contact body is also arranged on the movable contact body, a guide groove for cooperating with a stop screw on the movable contact seat is arranged on the guide block, guide protection heads are respectively arranged at both ends of the movable contact body, the diameter of the guide protection head is larger than the diameter of the movable contact body, and smaller than the outer diameter of the corresponding contact finger and the inner diameter of the isolating static contact or the grounding static contact, a plugging guide surface is arranged at one end of the guide protection head facing away from the movable contact body, the plugging guide surface is used to cooperate with the inner hole of the socket of the isolating static contact or the grounding static contact, so as to guide the movable contact body to be inserted into the isolating static contact or the grounding static contact, and an avoidance groove corresponding to the guide groove is also arranged on the outer peripheral surface of the guide protection head corresponding to the end of the guide block.

[0017] Furthermore, the plug-in guide surface is formed by a chamfered surface provided at the end of the guide protection head.

[0018] Furthermore, the guide protection head comprises a circular ring-shaped sleeve and a support plate arranged in the sleeve. The support plate is located between two ends of the sleeve and has an avoidance hole in the middle for avoiding the lead screw.

[0019] Furthermore, the guide protection head is sleeved on the corresponding end of the moving contact body and is interference fit with the moving contact body, and the support plate constitutes a limit plate of the corresponding end of the moving contact body.

[0020] Furthermore, a plurality of weight-reducing holes are arranged on the support plate around the avoidance hole.

[0021] Furthermore, the contact finger is a watch strap contact finger.

[0022] Furthermore, the chamfer forming the chamfered surface is a C chamfer.

[0023] Beneficial effects: The present invention provides an improved contact seat assembly. Compared with the prior art, the movable contact of the isolating switch of the device is equipped with an installation guide protection head, which combines guiding and supporting functions in one. On the one hand, the plug-in guide surface arranged on the guide protection head can guide the insertion of the movable contact of the isolating switch at the beginning of the contact between the movable contact of the isolating switch and the isolating static contact or the grounding static contact, so that the scratch between the suspended end of the movable contact of the isolating switch and the isolating static contact or the grounding static contact occurs at the guide protection head, thereby avoiding damage to the movable contact body. On the other hand, since the diameter of the guide protection head is larger than the diameter of the moving contact body and smaller than the diameter of the contact fingers, the guide protection head can support the moving contact of the isolating switch after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, thereby ensuring the coaxiality of the moving contact of the isolating switch with the isolating static contact or the grounding static contact after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, so that the contact fingers on the moving contact of the isolating switch are in full contact with the contact fingers on the isolating static contact or the grounding static contact, thereby improving the conductive efficiency. Therefore, the number of contact fingers on the moving contact body of the moving contact of the isolating switch can be reduced, and the cost of making the contact fingers can be reduced. The avoidance groove arranged on the guide protection head also avoids the interference of the stop screw with the guiding movement of the guide protection head.

[0024] The three-position switch of the present invention adopts the following technical solutions: The present invention provides a three-position switch, which comprises a contact contact seat assembly, wherein the contact contact seat assembly comprises an isolating switch moving contact and a moving contact seat, wherein the isolating switch moving contact comprises a moving contact body, wherein plug-in sections for plugging with an isolating static contact and a grounding static contact are respectively arranged at both ends of the moving contact body, wherein the plug-in sections are provided with contact fingers, wherein the moving contact body is further provided with a guide block extending in the length direction thereof, wherein the guide block is provided with a guide groove for cooperating with a stop screw on the moving contact seat, wherein the moving contact body is provided with a guide block for plugging ... A guide protection head is separately provided, the diameter of which is larger than the diameter of the moving contact body, and smaller than the outer diameter of the corresponding contact finger and the inner diameter of the isolating static contact or the grounding static contact; an end of the guide protection head facing away from the moving contact body is provided with a plug-in guide surface, and the plug-in guide surface is used to cooperate with the inner hole of the socket of the isolating static contact or the grounding static contact to guide the moving contact body to be inserted into the isolating static contact or the grounding static contact; an avoidance groove corresponding to the guide groove is also provided on the outer peripheral surface of the guide protection head corresponding to the end of the guide block.

[0025] Furthermore, the plug-in guide surface is formed by a chamfered surface provided at the end of the guide protection head.

[0026] Furthermore, the guide protection head comprises a circular ring-shaped sleeve and a support plate arranged in the sleeve. The support plate is located between two ends of the sleeve and has an avoidance hole in the middle for avoiding the lead screw.

[0027] Furthermore, the guide protection head is sleeved on the corresponding end of the moving contact body and is interference fit with the moving contact body, and the support plate constitutes a limit plate of the corresponding end of the moving contact body.

[0028] Furthermore, a plurality of weight-reducing holes are arranged on the support plate around the avoidance hole.

[0029] Furthermore, the contact finger is a watch strap contact finger.

[0030] Furthermore, the chamfer forming the chamfered surface is a C chamfer.

[0031] Beneficial effects: The present invention provides an improved three-position switch. Compared with the prior art, a guide protection head is installed on the moving contact of the isolating switch of the contact seat assembly of the device. The guide protection head combines guiding and supporting functions. On the one hand, the plug-in guide surface arranged on the guide protection head can guide the insertion of the moving contact of the isolating switch at the beginning of the contact between the moving contact of the isolating switch and the isolating static contact or the grounding static contact, so that the scratch between the suspended end of the moving contact of the isolating switch and the isolating static contact or the grounding static contact occurs at the guide protection head, thereby avoiding damage to the moving contact body. On the other hand, since the diameter of the guide protection head is larger than the diameter of the moving contact body and smaller than the diameter of the contact finger, the guide protection head can support the moving contact of the isolating switch after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, thereby ensuring the coaxiality of the moving contact of the isolating switch with the isolating static contact or the grounding static contact after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, so that the contact fingers on the moving contact of the isolating switch are in full contact with the contact fingers on the isolating static contact or the grounding static contact, thereby improving the conductive efficiency. Therefore, the number of contact fingers on the moving contact body of the moving contact of the isolating switch can be reduced, and the cost of making the contact fingers can be reduced. The avoidance groove arranged on the guide protection head avoids the interference of the stop screw with the guiding movement of the guide protection head. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a partial structural schematic diagram of an embodiment of a three-position switch of the present invention; Figure 2 for Figure 1 The sectional view of the assembly of the moving contact seat and the moving contact of the isolating switch; Figure 3 for Figure 1 Schematic diagram of the structure of the movable contact of the isolating switch; Figure 4 for Figure 1 Schematic diagram of the guide protection head structure.

[0033] In the figure: 1. Isolating static contact; 2. Isolating switch moving contact; 21. Guide protection head; 211. Sleeve; 212. Support plate; 213. Avoidance groove; 214. Avoidance hole; 215. Weight reduction hole; 22. Strap contact finger; 23. Moving contact body; 24. Guide block; 25. Guide groove; 26. Chamfered surface; 3. Stop screw; 4. Moving contact seat; 5. Insulating screw rod; 6. Grounding static contact; 7. Mounting plate. DETAILED DESCRIPTION

[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0035] The inventive concept of the disconnector moving contact of the present invention is described below: That is, by guiding the moving contact of the isolating switch at the beginning of its contact with the isolating static contact or the grounding static contact, the damage to the moving contact body is reduced, and after the moving contact of the isolating switch is inserted into the isolating static contact or the grounding static contact, the coaxiality of the moving contact of the isolating switch and the isolating static contact or the grounding static contact is improved to improve the conductive efficiency. The improved conductive efficiency can reduce the number of contact fingers on the moving contact of the isolating switch, thereby reducing the manufacturing cost.

[0036] Based on the above invention concept, Figure 2-Figure 4 As shown, the movable contact 2 of the isolating switch of the present invention includes a movable contact body 23, and plug-in sections for plugging with the isolating static contact 1 and the grounding static contact 6 are respectively provided at both ends of the movable contact body 23, and contact fingers are provided on the plug-in sections. The movable contact 2 of the isolating switch can be electrically connected with the isolating static contact 1 and the grounding static contact 6 through the contact fingers. A guide block 24 extending along the length direction thereof is also provided on the movable contact body 23, and a guide groove 25 for cooperating with the stop screw 3 on the movable contact seat 4 is provided on the guide block 24, so that the movable contact body 23 can only be guided and moved in the extension direction of the guide groove 25, and cannot rotate.

[0037] A guide protection head 21 is provided at both ends of the moving contact body 23, and the diameter of the guide protection head 21 is larger than the diameter of the moving contact body 23, so as to improve the centering ability of the moving contact body 23 and improve the coaxiality of the moving contact of the isolating switch after being inserted into the isolating static contact 1 and the grounding static contact 6. In addition, the diameter of the guide protection head 21 is smaller than the outer diameter of the corresponding contact finger and the inner diameter of the isolating static contact 1 or the grounding static contact 6, so that the guide protection head 21 can be smoothly inserted into the isolating static contact 1 or the grounding static contact 6 without affecting the contact finger on the moving contact 2 of the isolating switch and the corresponding isolating static contact 6. The contact finger on the isolating static contact 1 or the grounding static contact 6 is contacted, and the end of the guide protection head 21 away from the moving contact body 23 is provided with a plug-in guide surface, which is used to cooperate with the inner hole of the socket of the isolating static contact 1 or the grounding static contact 6 to guide the moving contact body 23 to be inserted into the isolating static contact 1 or the grounding static contact 6. The end corresponding to the guide block 24 on the outer peripheral surface of the guide protection head 21 is also provided with an avoidance groove 213 corresponding to the guide groove 25 to prevent the guide protection head 21 from being stopped by the anti-rotation screw 3 when moving with the moving contact body 23. And because the movable contact 2 of the isolating switch is supported by the guide protection head 21 instead of the movable contact body 23 after insertion, the diameter of the movable contact body 23 can be reduced, saving the manufacturing cost.

[0038] Based on the above main concepts, different embodiments are provided below for illustration.

[0039] In Example 1, by Figure 2-Figure 4As shown, this embodiment is mainly a specific introduction to the structure of the guide protection head 21. In one embodiment, the guide protection head is an integrally formed cone, a connection structure connected to the moving contact body is provided on the plane of the cone, a avoidance hole for avoiding the lead screw is provided in the axial direction of the cone, and the cone surface of the cone is the plug-in guide surface. In order to prevent short circuits from causing damage to the equipment, the guide protection head is made of insulating material. In a better embodiment, as Figure 2-Figure 4 As shown, in order to reduce the manufacturing cost and reduce the weight of the guide protection head, the guide protection head 21 includes a circular sleeve 211 and a support plate 212 arranged in the sleeve 211. The plug-in guide surface is located at the end of the sleeve 211 away from the moving contact body 23, and is composed of a chamfered surface 26 provided at the end of the guide protection head 21. The chamfer of the chamfered surface 26 is a C chamfer. The support plate 212 is located at both ends of the sleeve 211 and has an avoidance hole 214 in the middle for avoiding the screw. In order to prevent equipment damage caused by short circuit, the guide protection head 21 is made of insulating material.

[0040] In one embodiment, a light hole is provided on the support plate, a threaded hole corresponding to the light hole of the support plate is provided at the end of the moving contact body, the guide protection head is connected to the moving contact body through an insulating bolt, and the support plate constitutes a limit plate at the corresponding end of the moving contact of the disconnector. In a better embodiment, Figure 2-Figure 4 As shown, for easy installation, the guide protection head 21 is made of insulating rubber, which is sleeved on the corresponding end of the moving contact body 23 and has an interference fit with the moving contact body 23, and the support plate 212 constitutes a limit plate at the corresponding end of the moving contact body.

[0041] In one embodiment, no weight-reducing hole is provided on the guide protection head, and the movable contact of the disconnector can still be used normally. However, due to the heavy weight of the movable contact end of the disconnector, the end is displaced a large distance under the action of gravity when in the suspended state, and is severely worn. In a better embodiment, as shown in FIG. Figure 2-Figure 4 As shown, in order to reduce the weight of the guide protection head 21 and prevent excessive wear, a weight-reducing hole is provided on the guide protection head 21. The weight-reducing hole can be one or more. The weight-reducing hole 215 is circular. Of course, the weight-reducing hole can also be square or diamond-shaped, etc., as long as it does not affect the use. When there are multiple weight-reducing holes, the multiple weight-reducing holes 215 are evenly arranged around the circumference of the moving contact 2 of the isolating switch. Of course, they can also be unevenly arranged around the circumference of the moving contact 2 of the isolating switch, and any method that does not affect the use of the moving contact 2 of the isolating switch is acceptable.

[0042] In one embodiment, the contact fingers of the isolating switch moving contact 2, the isolating static contact 1, and the grounding static contact 6 are all strap contact fingers 22. In other embodiments, the contact fingers may also be spring contact fingers or plum blossom contact fingers.

[0043] With the help of Figure 2-Figure 4As shown, the present invention also provides a contact seat assembly, which includes a moving contact seat 4 and a moving contact 2 of an isolating switch. The moving contact 2 of the isolating switch is the moving contact 2 of the isolating switch described in the above embodiment. The contact seat assembly also includes a moving contact seat 4. The moving contact 2 of the isolating switch is installed in the moving contact seat 4 and can be guided to reciprocate in the moving contact seat 4. A limiting hole corresponding to the position of the guide groove 213 is opened on the moving contact seat 4. A stop screw 3 is installed on the limit block. The lower end of the stop screw 3 extends into the guide groove to limit the rotation of the switch moving contact 2.

[0044] With the help of Figure 1-Figure 4 As shown, the present invention also provides a three-position switch, which includes a contact seat assembly, a grounding static contact 6, and an isolating static contact 1. The contact seat assembly is the contact seat assembly described in the above embodiment. The grounding static contact 6 is installed on a mounting plate 7. The isolating switch moving contact 2, the moving contact seat 4, the grounding static contact 6, and the isolating static contact 1 are coaxial. The three-position switch also includes an insulating screw rod 5. The isolating switch moving contact 2 is provided with an internal thread that matches the external thread of the insulating screw rod 5. When the insulating screw rod 5 rotates, it can drive the isolating switch moving contact 2 to guide reciprocating motion in the direction of its own axis to switch the closing position, the isolating position, and the grounding position. When the isolating switch moving contact 2 is only in contact with the moving contact seat 4, it is the isolation position. When the isolating switch moving contact 2 is connected between the moving contact seat 4 and the isolating contact, it is the closing position. When the isolating switch moving contact 2 is connected between the moving contact seat 4 and the grounding contact, it is the grounding position.

[0045] When the three-position switch is in use, assuming that the initial position of the three-position switch is the grounding position, at this time, the isolating switch moving contact 2 is connected between the grounding static contact 6 and the moving contact seat 4, the insulating screw 5 passes through the grounding static contact and is threadedly connected to the isolating switch moving contact 2, a guide block 24 is provided on the isolating switch moving contact 2, a guide groove 213 is provided on the guide block 24, a limit hole is provided on the moving contact seat 4, and the lower part of the stop screw 3 in the limit hole is inserted into the guide groove 213 to stop the isolating switch moving contact 2, so that the insulating screw 5 is connected to the isolating switch. The moving contact 2 of the isolating switch forms a screw nut structure, and the moving contact 2 of the isolating switch can be guided and moved in the axial direction of the moving contact seat 4. In order to prevent the guide protection head 21 from interfering with the guided movement of the moving contact 2 of the isolating switch, a avoidance hole 214 corresponding to the guide groove 213 is provided on the guide protection head 21. At this time, the insulating screw 5 is rotated, and the insulating screw 5 drives the moving contact 2 of the isolating switch to move toward the direction of the isolating static contact 1. When the contact fingers on the moving contact 2 of the isolating switch are separated from the contact fingers on the grounding static contact 6, the three-position switch is switched to the isolation position.

[0046] After the three-position switch is switched to the isolation position, the insulating screw rod 5 continues to be rotated to move toward the isolation static contact 1. At this time, due to the loss of support, the end of the isolating switch moving contact 2 close to the isolation static contact 1 is deviated downward under the action of gravity. When the isolating switch moving contact 2 first contacts with the isolation static contact 1, the chamfered surface 26 of the guide protection head 21 on the isolating switch moving contact 2 can guide the downward-deflected isolating switch moving contact 2 to be smoothly inserted into the isolation static contact 1. After being inserted for a distance, the end face of the support plate 212 close to the isolation static contact 1 abuts against the isolation static contact 1 to limit the axial position of the isolating switch moving contact 2. The three-position switch is switched to the closing position. Since the diameter of the guide protection head 21 is slightly larger than the inner hole of the socket of the isolation static contact 1, the alignment of the isolating switch moving contact 2 and the isolation static contact 1 can be ensured. At this time, the contact fingers on the isolating switch moving contact 2 are in full contact with the contact fingers on the isolation static contact 1 to ensure the conductive efficiency.

[0047] The operation of the three-position switch when it is in other positions is similar to the above operation and will not be repeated here.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A movable contact of an isolating switch, comprising a movable contact body, wherein plug-in sections for plugging with an isolating static contact and a grounding static contact are respectively arranged at both ends of the movable contact body, wherein the plug-in sections are provided with contact fingers, and the movable contact body is further provided with a guide block extending along its length direction, wherein the guide block is provided with a guide groove for cooperating with a stop screw on a movable contact seat, wherein the movable contact body is provided with a guide block extending along its length direction, wherein the guide block is provided with a guide groove for cooperating with a stop screw on a movable contact seat, wherein the movable contact body is provided with a guide block extending along its length direction, wherein the guide block is provided with a guide block ... Guide protection heads are respectively provided at both ends of the moving contact body, the diameter of the guide protection head is larger than the diameter of the moving contact body, and smaller than the outer diameter of the corresponding contact finger and the inner diameter of the isolating static contact or the grounding static contact, and a plug-in guide surface is provided at the end of the guide protection head facing away from the moving contact body, and the plug-in guide surface is used to cooperate with the inner hole of the socket of the isolating static contact or the grounding static contact to guide the moving contact body to be inserted into the isolating static contact or the grounding static contact, and an avoidance groove corresponding to the guide groove is also provided on the outer peripheral surface of the guide protection head corresponding to the end of the guide block.

2. The movable contact of the isolating switch according to claim 1, characterized in that: The plug-in guide surface is formed by a chamfered surface provided at the end of the guide protection head.

3. The movable contact of the disconnector according to claim 1 or 2, characterized in that: The guide protection head comprises a circular sleeve body and a support plate arranged in the sleeve body. The support plate is located between the two ends of the sleeve body and has an avoidance hole in the middle for avoiding the lead screw.

4. The movable contact of the isolating switch according to claim 3, characterized in that: The guide protection head is sleeved on the corresponding end of the moving contact body and is interference fit with the moving contact body, and the support plate constitutes a limit plate of the corresponding end of the moving contact body.

5. The movable contact of the isolating switch according to claim 3, characterized in that: A plurality of weight-reducing holes are also arranged on the support plate around the avoidance hole.

6. The movable contact of the isolating switch according to claim 3, characterized in that: The contact finger is a watch strap contact finger.

7. The movable contact of the isolating switch according to claim 1, characterized in that: The contact finger is a watch strap contact finger.

8. The movable contact of the isolating switch according to claim 2, characterized in that: The chamfer forming the chamfered surface is a C chamfer.

9. A contact seat assembly, characterized in that: The contact and contact seat assembly comprises an isolating switch movable contact and a movable contact seat, and the isolating switch movable contact is the isolating switch movable contact according to any one of claims 1 to 8.

10. A three-position switch, characterized in that: The three-position switch comprises a contact seat assembly, and the contact seat assembly is the contact seat assembly according to claim 9.

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