Contact assembly and switch device

Abstract

The invention relates to the technical field of electric switches, in particular to a contact assembly and switch equipment, the contact assembly comprises a contact seat and a contact finger, the contact seat is provided with a mounting ring groove, the contact finger is provided with a limiting end mounted in the mounting ring groove and a contact end extending out of the mounting ring groove, and the groove side wall of the mounting ring groove comprises an inner groove side wall and an outer groove side wall which are oppositely arranged. The limiting end of the contact finger and the groove side wall of the mounting ring groove are provided with a limiting convex part and a limiting groove respectively, the limiting convex part extends into the limiting groove, and the limiting groove is provided with a stopping part which is used for forming stopping fit with the limiting convex part in the direction from the groove bottom to the groove opening of the mounting ring groove; the pull-out force applied by the adaptive feeler lever on the contact finger can act on the part where the limiting convex part and the limiting groove form the stop fit, and when one side of the contact end of the contact finger is provided with the inward turning edge of the arc striking cover head, collision impact on the inward turning edge which is weak and serves as a main arc ablation bearing part can be avoided, the service life of the arc striking cover head can be guaranteed, and the service life of the arc striking cover head is prolonged. And reliable use can be ensured.

Description

Technical Field

[0001] This invention relates to the field of electrical switch technology, and more specifically to a contact assembly and a switching device. Background Technology

[0002] With the development of power systems, the requirements for the reliability of power system operation are increasing, and the application of sulfur hexafluoride gas-insulated metal-enclosed switchgear (i.e., GIS equipment) is becoming more and more widespread. Grounding switches are important components in GIS equipment, and have the function of ensuring reliable grounding of equipment and lines. Existing grounding switches, such as the grounding switch disclosed in Chinese invention patent CN105448549B, include a moving contact and a stationary contact arranged vertically opposite each other. The moving contact includes a vertically extending contact rod, and the stationary contact includes a shield and contact fingers mounted on its inner wall. The shield and contact fingers constitute a contact assembly, and the shield constitutes a contact seat. The shield has a mounting ring groove, and each contact finger is installed in the mounting ring groove to form an annular contact. A compression spring is installed between the contact finger and the outer groove sidewall of the mounting ring groove so that the contact finger presses against the inner groove sidewall of the mounting ring groove. The upper end of the contact finger is located in the mounting ring groove, and the lower end extends out of the mounting ring groove to contact the moving contact. The end of the contact finger located in the mounting ring groove is a limiting end, and the end located outside the mounting ring groove is a contact end. The shield has an arc-inducing cover, and the lower end of the arc-inducing cover has an inwardly turned edge located below the lower end face of the contact finger.

[0003] In this type of contact finger installation, during circuit breaking, due to the significant friction between the contact rod and the contact finger, the contact rod pulls out, causing the contact finger to move downwards. The lower end of the contact finger is stopped and limited by the inner edge of the arc-starting cover to prevent the contact finger from coming out of the mounting ring groove. However, the circuit breaking speed is often very fast, and the contact rod will cause the contact finger to collide with the inner edge of the arc-starting cover downwards, impacting the inner edge. Since the inner edge is relatively thin and is the main part that bears the arc erosion, it is easy to deform or damage the inner edge, which is detrimental to reliability and affects the service life of the shield. Summary of the Invention

[0004] The purpose of this invention is to provide a contact assembly that solves the problem that the current contact assembly relies on the inner edge of the arc-starting cover to limit the contact finger and prevent the contact finger from falling out of the mounting ring groove, which causes collision and impact on the inner edge and affects reliability; the purpose of this invention is also to provide a switching device to solve the above problems.

[0005] The technical solution of the contact assembly of the present invention is as follows: A contact assembly includes a contact base and a contact finger. The contact base has a mounting ring groove, and the contact finger has a limiting end that fits into the mounting ring groove and a contact end that extends out of the mounting ring groove. The groove sidewall of the mounting ring groove includes an inner groove sidewall and an outer groove sidewall that are disposed opposite to each other. One of the limiting end of the contact finger and the groove sidewall of the mounting ring groove has a limiting protrusion, and the other has a limiting groove. The limiting protrusion extends into the limiting groove, and the limiting groove has a stop portion for forming a stop engagement with the limiting protrusion in the direction from the bottom to the opening of the mounting ring groove.

[0006] Furthermore, the limiting groove is provided on the inner side wall of the mounting ring groove, and the limiting protrusion is provided at the limiting end of the touch finger.

[0007] Furthermore, the contact seat includes a base and a support that are separately arranged. The base has a support connecting part for connecting the support. The support connecting part of the base and the outer wall of the support are used to form the inner groove sidewall of the mounting annular groove. The base and the support have opposite sides in the direction from the bottom to the opening of the mounting annular groove. The opposite sides of the base and the support are used to form the limiting groove.

[0008] Furthermore, the base has a support connection and a support thread connection.

[0009] Furthermore, a movable gap is provided between the groove wall of the limiting groove and the limiting protrusion to allow the contact finger to swing relative to the contact seat.

[0010] Furthermore, the inner sidewall of the mounting ring groove is uniformly provided with positioning grooves that correspond one-to-one with the contact fingers along its circumference, and each contact finger is installed in the positioning groove.

[0011] Furthermore, the mounting ring groove is provided with a leaf spring for pressing the contact finger against the inner groove sidewall of the mounting ring groove, the outer side of the contact finger faces the outer groove sidewall of the mounting ring groove, and a slot is provided on the outer side of the contact finger for the end of the leaf spring to be inserted.

[0012] Furthermore, a through groove is provided in the middle of the outer side of the finger, the through groove having two opposite groove walls in the length direction of the finger, and the slot having an opening located on the groove wall of the through groove.

[0013] Furthermore, the outer groove sidewall of the mounting ring groove has a hollow structure, and a retaining ring is provided inside the mounting ring groove. The retaining ring is located between the outer groove sidewall of the mounting ring groove and the contact finger. A leaf spring abuts between the retaining ring and the contact finger, and the leaf spring is used to press the contact finger against the inner groove sidewall of the mounting ring groove.

[0014] The beneficial effects of the contact assembly of the present invention are as follows: The present invention improves upon the contact assembly of the prior art by providing a limiting protrusion and a limiting groove on the limiting end of the contact finger located in the mounting ring groove and on the side wall of the mounting ring groove, respectively. The limiting groove has a stop portion that forms a stop engagement with the limiting protrusion in the direction from the bottom to the opening of the mounting ring groove. In this way, the limiting protrusion and the limiting groove cooperate to keep the contact finger in the position of the mounting ring groove, preventing the contact finger from coming out of the groove opening side of the mounting ring groove. When the circuit is opened, the pull-out force applied by the adapted contact rod to the contact finger will act on the part where the limiting protrusion and the limiting groove form a stop engagement, resulting in stable force bearing. When there is an inward-turned edge of the arc-starting cover on one side of the contact end of the contact finger, it can avoid collision and impact on the weak and mainly arc-erosion-bearing part of the inward-turned edge, which is beneficial to ensuring its service life and reliable use.

[0015] The technical solution of the switching device of the present invention is as follows: A switching device includes a contact assembly, which includes a contact base and a contact finger. The contact base has a mounting ring groove, and the contact finger has a limiting end that fits into the mounting ring groove and a contact end that extends out of the mounting ring groove. The groove sidewall of the mounting ring groove includes an inner groove sidewall and an outer groove sidewall that are disposed opposite to each other. One of the limiting end of the contact finger and the groove sidewall of the mounting ring groove has a limiting protrusion, and the other has a limiting groove. The limiting protrusion extends into the limiting groove, and the limiting groove has a stop portion for forming a stop engagement with the limiting protrusion in the direction from the bottom to the opening of the mounting ring groove.

[0016] Furthermore, the limiting groove is provided on the inner side wall of the mounting ring groove, and the limiting protrusion is provided at the limiting end of the touch finger.

[0017] Furthermore, the contact seat includes a base and a support that are separately arranged. The base has a support connecting part for connecting the support. The support connecting part of the base and the outer wall of the support are used to form the inner groove sidewall of the mounting annular groove. The base and the support have opposite sides in the direction from the bottom to the opening of the mounting annular groove. The opposite sides of the base and the support are used to form the limiting groove.

[0018] Furthermore, the base has a support connection and a support thread connection.

[0019] Furthermore, a movable gap is provided between the groove wall of the limiting groove and the limiting protrusion to allow the contact finger to swing relative to the contact seat.

[0020] Furthermore, the inner sidewall of the mounting ring groove is uniformly provided with positioning grooves that correspond one-to-one with the contact fingers along its circumference, and each contact finger is installed in the positioning groove.

[0021] Furthermore, the mounting ring groove is provided with a leaf spring for pressing the contact finger against the inner groove sidewall of the mounting ring groove, the outer side of the contact finger faces the outer groove sidewall of the mounting ring groove, and a slot is provided on the outer side of the contact finger for the end of the leaf spring to be inserted.

[0022] Furthermore, a through groove is provided in the middle of the outer side of the finger, the through groove having two opposite groove walls in the length direction of the finger, and the slot having an opening located on the groove wall of the through groove.

[0023] Furthermore, the outer groove sidewall of the mounting ring groove has a hollow structure, and a retaining ring is provided inside the mounting ring groove. The retaining ring is located between the outer groove sidewall of the mounting ring groove and the contact finger. A leaf spring abuts between the retaining ring and the contact finger, and the leaf spring is used to press the contact finger against the inner groove sidewall of the mounting ring groove.

[0024] The beneficial effects of the switchgear of the present invention are as follows: The present invention improves upon the contact assembly of the switchgear in the prior art by providing a limiting protrusion and a limiting groove on the limiting end of the contact finger located in the mounting ring groove and on the side wall of the mounting ring groove, respectively. The limiting groove has a stop portion for forming a stop engagement with the limiting protrusion in the direction from the bottom to the opening of the mounting ring groove. In this way, the limiting protrusion and the limiting groove cooperate to keep the contact finger in the position of the mounting ring groove, preventing the contact finger from coming out of the groove opening side of the mounting ring groove. When the circuit is opened, the pull-out force applied by the adapted contact rod to the contact finger will act on the part where the limiting protrusion and the limiting groove form a stop engagement, resulting in stable force bearing. When there is an inward-turned edge of the arc-inducing cover on one side of the contact end of the contact finger, it can avoid collision and impact on the weak and mainly arc-erosion-bearing part of the inward-turned edge, which is beneficial to ensuring its service life and reliable use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the switching device of the present invention; Figure 2 for Figure 1 A schematic diagram of the contact assembly in the diagram; Figure 3 for Figure 2 A schematic diagram of one perspective of the finger in the image; Figure 4 for Figure 2 A schematic diagram of the finger from another perspective; Figure 5 for Figure 2 A half-sectional view of the positioning bracket in the middle; Figure 6 for Figure 2 Side view of the positioning bracket in the image.

[0026] In the diagram: 1. Housing; 2. Operating mechanism; 3. Opening and closing mechanism; 4. Moving contact rod; 5. Insulating basin; 6. Stationary side support conductor; 7. Contact assembly; 70. Limiting groove; 71. Base; 72. Positioning bracket; 720. Internal thread section; 721. Positioning boss; 722. Positioning groove; 73. Shielding cover body; 74. Arc-starting cover head; 75. Contact finger; 751. Limiting protrusion; 752. Through groove; 753. Slot; 76. Leaf spring; 77. Retaining ring. Detailed Implementation

[0027] The contact assembly of the present invention has a limiting protrusion and a limiting groove respectively provided at the limiting end of the contact finger located in the mounting ring groove and on the side wall of the mounting ring groove. The limiting groove has a stop portion for forming a stop engagement with the limiting protrusion in the direction from the bottom to the opening of the mounting ring groove. In this way, the limiting protrusion and the limiting groove cooperate to keep the contact finger in the position of the mounting ring groove, preventing the contact finger from coming out of the groove opening side of the mounting ring groove. When the circuit is opened, the pull-out force applied by the adapted contact rod to the contact finger will act on the part where the limiting protrusion and the limiting groove form a stop engagement, and the force bearing is stable. When there is an inward folded edge of the arc-starting cover on the contact end side of the contact finger, it can avoid collision and impact on the weak inward folded edge, which is the main part that bears the arc ablation, thus helping to ensure its service life and reliable use.

[0028] Embodiments of the switching device of the present invention: The switching device in this embodiment is a fast grounding switch, which is a type of grounding switch capable of closing short-circuit currents. For example... Figure 1 As shown, the fast grounding switch includes a housing 1, an operating mechanism 2, an opening and closing mechanism 3, a moving contact, an insulating basin 5, a stationary side support conductor 6, and a stationary contact. The moving contact includes a moving contact rod 4, and the stationary contact is a contact assembly 7. The insulating basin 5 is fixed to the housing 1, and the stationary side support conductor 6 is fixedly connected to the insulating basin 5 by bolts. The contact assembly 7 is fixed in the inner cavity of the stationary side support conductor 6 by bolts. The opening and closing mechanism 3 is fixed to the housing 1. The operating mechanism 2 is installed externally on the opening and closing mechanism 3, and the moving contact rod 4 is connected internally. The opening and closing mechanism 3 is connected to the operating mechanism 2 by transmission. Under the drive of the operating mechanism 2, the opening and closing mechanism 3 drives the moving contact rod 4 to move, causing the moving contact to separate and engage with the stationary contact, thereby realizing the opening and closing operation of the fast grounding switch.

[0029] In this embodiment, the moving contact rod 4 moves up and down, and the insertion direction of the moving contact and the stationary contact is up and down. The moving contact rod 4 is inserted downward into the contact assembly 7 to achieve closing, and moves upward away from the contact assembly 7 to achieve opening.

[0030] like Figure 1 and Figure 2As shown, the contact assembly 7 includes a contact base, a contact finger 75, a leaf spring 76, and a retaining ring 77. The contact base has a mounting ring groove, and the contact finger 75, leaf spring 76, and retaining ring 77 are installed in the mounting ring groove. The contact finger 75 has a limiting end that enters the mounting ring groove and a contact end that extends out of the mounting ring groove. The groove sidewall of the mounting ring groove includes an inner groove sidewall and an outer groove sidewall that are disposed opposite to each other. The limiting end of the contact finger 75 and the groove sidewall of the mounting ring groove are respectively provided with a limiting protrusion 751 and a limiting groove 70. The limiting protrusion 751 extends into the limiting groove 70 to maintain the position of the contact finger 75 in the mounting ring groove and prevent the contact finger 75 from coming out of the mounting ring groove.

[0031] The contact assembly 7 includes a base 71, a positioning bracket 72, and a shielding cover coaxially arranged. The shielding cover includes a shielding cover body 73 and an arc-starting cover head 74. The arc-starting cover head 74 has an inwardly turned edge located directly above the contact finger 75. The inwardly turned edge of the arc-starting cover head 74 is spaced apart from the upper end of the contact finger 75, allowing the upper end of the contact finger 75 to swing under the pressure of the moving contact rod 4 when it is inserted into the insertion hole formed by the contact fingers 75. When the moving contact rod 4 is pulled out of the insertion hole formed by the contact fingers 75, the upper end of the contact finger 75 will not hit the inwardly turned edge of the arc-starting cover head 74 through the cooperation of the limiting protrusion 751 and the limiting groove 70. The arc-starting cover head 74 is made of copper-tungsten alloy and is bolted to the shielding cover body 73, providing both shielding against electric fields and resistance to arc erosion.

[0032] The base 71 includes an integrally formed lower plate and an upper cylinder. The outer diameter of the upper cylinder is smaller than that of the lower plate. The lower plate and the upper cylinder are coaxially arranged and have an internal hole that runs vertically through them. The positioning bracket 72 is a cylindrical structure and is fixedly connected to the upper end of the upper cylinder of the base 71. The shielding cover body 73 is mounted on the upper cylinder of the positioning bracket 72 and the base 71. The lower end of the shielding cover body 73 is fixedly connected to the lower plate of the base 71. The shielding cover body 73 is spaced apart from the positioning bracket 72 and the upper cylinder of the base 71 to form an installation ring groove. The part of the inner wall of the shielding cover body 73 that is radially opposite to the upper cylinder of the positioning bracket 72 and the base 71 forms the outer groove sidewall of the installation ring groove. Correspondingly, the part of the outer wall of the positioning bracket 72 and the base 71 that is radially opposite to the shielding cover body 73 forms the inner groove sidewall of the installation ring groove. The installation ring groove is formed by the separately arranged shielding cover, base 71 and positioning bracket 72, which facilitates the installation of the contact finger 75, leaf spring 76 and retaining ring 77 in the installation ring groove.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the length direction of the contact finger 75 is vertical, and the upper end of the contact finger 75 forms a contact end that extends out of the mounting ring groove for contact with the moving contact rod 4. The groove opening of the mounting ring groove faces upward and has a groove bottom, and the lower end of the contact finger 75 can be supported on the groove bottom of the mounting ring groove. Under the elastic pressing action of the leaf spring 76, the contact finger 75 is pressed on the positioning bracket 72, that is, pressed on the inner groove side wall of the mounting ring groove. The leaf spring 76 abuts between the retaining ring 77 and the contact finger 75. The retaining ring 77 is located between the outer groove side wall of the mounting ring groove and the contact finger 75, that is, between the inner wall of the shielding cover body 73 and the contact finger 75. The shielding cover body 73 has a radially penetrating hollow structure, that is, the outer groove side wall of the mounting ring groove has a hollow structure. The hollow structure facilitates heat dissipation. At the same time, the retaining ring 77 is a circular ring, which supports each leaf spring 76 and avoids some leaf springs 76 lacking a support point due to the hollow structure on the outer groove side wall of the mounting ring groove. The lower end of the retaining ring 77 can be supported on the upper side of the lower plate of the base 71. The inner wall of the shielding cover body 73 is provided with a downward step surface so as to block the upper end of the retaining ring 77 and limit the position of the retaining ring 77.

[0034] The outer surface of the contact finger 75 faces the outer groove sidewall of the mounting ring groove, while the inner and outer surfaces of the contact finger 75 are opposite to each other in the thickness direction of the contact finger 75. A through groove 752 is provided in the middle of the outer surface of the contact finger 75, which extends along the width direction of the contact finger 75. The through groove 752 has two opposite groove walls in the length direction of the contact finger 75. At the upper and lower ends of the outer surface of the contact finger 75, there are retaining grooves 753. The retaining grooves 753 have openings on the groove walls of the through groove 752 to facilitate manufacturing and to avoid deformation of the leaf spring 76. The groove width of the retaining groove 753 is smaller than the width of the contact finger 75 and is adapted to the width of the leaf spring 76. Each contact finger 75 corresponds to one leaf spring 76. The leaf spring 76 is an elastic element used to apply top pressure to the contact finger 75. The two retaining grooves 753 allow the two ends of the leaf spring 76 to be engaged to cooperate with the retaining ring 77 to maintain the relative position of the leaf spring 76 and the contact finger 75.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the center hole of the positioning bracket 72 is connected to the center hole of the base 71. The lower part of the center hole of the positioning bracket 72 is provided with an internal thread section 720, and the upper part of the upper cylinder of the base 71 is provided with an external thread section, so that the positioning bracket 72 is threadedly connected to the base 71. The positioning bracket 72 constitutes a support, and the external thread section provided on the upper part of the upper cylinder of the base 71 constitutes a support connection part for connecting the support. The positioning bracket 72 is threadedly connected to the base 71, which helps to ensure the centering setting and provides a basis for the centering of the moving contact rod 4 and the contact finger 75. The outer wall of the positioning bracket 72 includes an upper section, a middle section, and a lower section. The length of the middle section of the outer wall of the positioning bracket 72 is greater than the length of the upper and lower sections. The middle section of the positioning bracket 72 is provided with a plurality of positioning protrusions 721 evenly along the circumferential direction. The positioning protrusions 721 extend in the vertical direction, and a positioning groove 722 is formed between two adjacent positioning protrusions 721. The positioning groove 722 corresponds one-to-one with the contact finger 75, so that the inner groove sidewall of the mounting ring groove is provided with positioning grooves 722 corresponding one-to-one with the contact finger 75 evenly along its circumference. The contact finger 75 is installed in the positioning groove 722. The positioning groove 722 is a vertical through groove 752. The upper and lower ends of the contact finger 75 extend out of the positioning groove 722. The evenly distributed positioning grooves 722 are used to position each contact finger 75, ensuring that each contact finger 75 is evenly distributed in the circumferential direction so that each contact finger 75 is in uniform contact with the moving contact rod 4, satisfying the effective current flow under the thermal stability of the grounding circuit. The positioning boss 721 is a fan-shaped boss, which makes the opposite two sides of the positioning groove 722 parallel and opposite, which facilitates the installation of the contact finger 75 and ensures reliable positioning.

[0036] The outer diameter of the lower section of the outer wall of the positioning bracket 72 is larger than the outer diameter of the lower part of the upper cylinder of the base 71. The outer diameter of the lower part of the upper cylinder of the base 71 is smaller than the outer diameter of the upper part. The lower end face of the positioning bracket 72 is opposite to the upper side of the lower plate of the base 71, and forms the opposite side of the base 71 and the support in the direction from the bottom to the opening of the mounting annular groove. The lower end face of the positioning bracket 72, the upper side of the lower plate of the base 71, and the lower outer wall of the upper cylinder of the base 71 together form a limiting groove 70. The limiting groove 70 is an annular groove that runs radially outward along the base 71, so that the limiting protrusions 751 of each contact finger 75 can extend into it. The lower outer wall of the upper cylinder of the base 71 forms the bottom wall of the limiting groove 70. The lower end face of the positioning bracket 72 and the upper side of the lower plate of the base 71 form the two side walls of the limiting groove 70. The positioning bracket 72 and the base 71 form a limiting groove 70, which facilitates the installation of the touch finger 75. Moreover, the limiting groove 70 is set on the inner side wall of the mounting ring groove. The elastic force of the leaf spring 76 can keep the limiting protrusion 751 of the touch finger 75 in the limiting groove 70, which is conducive to reliable limiting.

[0037] The contact end and limiting end of the contact finger 75 are both thicker than the middle part. The middle part of the contact finger 75 is installed in the positioning groove 722. The limiting protrusion 751 is provided at the limiting end of the contact finger 75 and protrudes inward. The upper surface of the limiting protrusion 751 is a smooth surface. The upper side wall of the limiting groove 70 forms a stop part to form a stop engagement with the limiting protrusion 751 in the direction from the bottom to the opening of the mounting ring groove, so as to restrict the upward movement of the contact finger 75. There is a movable gap between the groove wall of the limiting groove 70 and the limiting protrusion 751 to allow the contact finger 75 to swing relative to the contact seat. When the moving contact rod 4 is inserted into the insertion hole formed by the contact ends of each contact finger 75, the moving contact rod 4 pushes each contact finger 75 outward, causing each contact finger 75 to swing. At this time, the movable gap in the limiting groove 70 can be used to allow the limiting protrusion 751 to move, ensuring that the contact finger 75 swings smoothly.

[0038] The lower end face of the shielding cover body 73 is provided with a threaded hole, and the outer edge of the lower plate body is provided with a bolt through hole corresponding to the threaded hole. The stationary side support conductor 6 is provided with a bolt through hole corresponding to the bolt through hole, so that the shielding cover and the base 71 can be fixed together on the stationary side support conductor 6 by bolts. The diameter of the bolt through hole on the stationary side support conductor 6 is larger than that of the threaded hole on the lower end face of the shielding cover body 73. The gap between the bolt and the hole wall of the bolt through hole can be used to make fine adjustment of the installation position of the contact assembly 7, which helps to ensure good alignment between the moving contact rod 4 and the contact assembly 7.

[0039] In other embodiments, a limiting protrusion may be provided on the inner sidewall of the mounting ring groove, and a limiting groove may be provided at the limiting end of the touch finger. The limiting protrusion may be formed by providing an outward flange at the lower end of the positioning bracket.

[0040] In other embodiments, a limiting protrusion protruding outward can be provided on the touch finger, and a limiting groove can be provided on the outer groove sidewall of the mounting ring groove. The limiting groove can be provided on the lower end inner wall of the shield body. In this case, the retaining ring can be provided above the limiting protrusion so that the limiting protrusion can extend into the limiting groove.

[0041] In other embodiments, the positioning bracket and the base can also be integrally formed, in which case the limiting groove is an integrally formed groove.

[0042] In other embodiments, the positioning bracket can also be fixedly connected to the base by bolts, and an inner ring platform is provided on the inner wall of the positioning bracket, which is fixed to the upper end surface of the base by bolts.

[0043] In other embodiments, the support can also be a cylinder with a cylindrical outer wall, in which case the positioning groove is no longer provided.

[0044] In other embodiments, an internal thread can be provided on the base and an external thread can be provided on the support to achieve a threaded connection between the base and the support.

[0045] In other embodiments, the limiting protrusion and the limiting groove may also be in spherical contact fit.

[0046] Embodiments of the contact assembly of the present invention: The contact assembly in this embodiment has the same structure as the contact assembly in the above-described embodiment of the switching device, and will not be described again here.

[0047] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A contact assembly, comprising a contact base and a contact finger, wherein the contact base is provided with a mounting annular groove, the contact finger has a limiting end for inserting into the mounting annular groove and a contact end extending out of the mounting annular groove, and the groove sidewall of the mounting annular groove includes an inner groove sidewall and an outer groove sidewall disposed opposite to each other, characterized in that, The limiting end of the touch finger and the groove sidewall of the mounting ring groove are provided with a limiting protrusion on one side and a limiting groove on the other side. The limiting protrusion extends into the limiting groove, and the limiting groove has a stopping part for forming a stopping engagement with the limiting protrusion in the direction from the bottom of the groove to the opening of the groove.

2. The contact assembly according to claim 1, characterized in that, The limiting groove is provided on the inner side wall of the mounting ring groove, and the limiting protrusion is provided at the limiting end of the touch finger.

3. The contact assembly according to claim 2, characterized in that, The contact seat includes a base and a support that are separately arranged. The base has a support connecting part for connecting the support. The support connecting part of the base and the outer wall of the support are used to form the inner groove sidewall of the mounting annular groove. The base and the support have opposite sides in the direction from the bottom to the opening of the mounting annular groove. The opposite sides of the base and the support are used to form the limiting groove.

4. The contact assembly according to claim 3, characterized in that, The base has a support connection and a support thread connection.

5. The contact assembly according to any one of claims 1-4, characterized in that, A movable gap is provided between the groove wall of the limiting groove and the limiting protrusion to allow the contact finger to swing relative to the contact seat.

6. The contact assembly according to any one of claims 1-4, characterized in that, The inner sidewall of the mounting ring groove is uniformly provided with positioning grooves that correspond one-to-one with the contact fingers along its circumference, and each contact finger is installed in the positioning groove.

7. The contact assembly according to any one of claims 1-4, characterized in that, The mounting ring groove is equipped with a leaf spring for pressing the contact finger against the inner groove sidewall of the mounting ring groove. The outer side of the contact finger faces the outer groove sidewall of the mounting ring groove, and the outer side of the contact finger is provided with a slot for the end of the leaf spring to be inserted.

8. The contact assembly according to claim 7, characterized in that, A through groove is provided in the middle of the outer side of the finger. The through groove has two opposite groove walls in the length direction of the finger. The slot has an opening located on the groove wall of the through groove.

9. The contact assembly according to any one of claims 1-4, characterized in that, The outer groove sidewall of the mounting ring groove has a hollow structure, and a retaining ring is provided inside the mounting ring groove. The retaining ring is located between the outer groove sidewall of the mounting ring groove and the contact finger. A leaf spring abuts between the retaining ring and the contact finger. The leaf spring is used to press the contact finger against the inner groove sidewall of the mounting ring groove.

10. A switching device, characterized in that, Includes the contact assembly described in any one of claims 1-9.

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