Integrated tulip contact and grounding switch

Abstract

The invention relates to the technical field of high-voltage switch equipment, in particular to an integrated tulip contact and a grounding switch. According to the integrated tulip contact provided by the invention, the tulip contact is formed by only one integrally-formed metal conductive piece, and compared with a traditional tulip contact formed by assembling a plurality of independent components such as a contact finger, a supporting frame and a tension spring, the integrated tulip contact adopts an integrated forming process, so that the components such as a spring and the supporting frame are omitted, the assembly process is reduced, and the assembly efficiency is improved. The production efficiency is improved, the cost is reduced, the failure risk of the elastic component is avoided, and the integrated structure has no loosening hidden danger and adapts to high-temperature, vibration and other harsh environments. And through a special structural design, the integrated tulip contact can provide effective contact pressure only by virtue of self elasticity, and the fatigue life can reach the use standard of the high-voltage grounding switch.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switchgear, and in particular to an integrated plum blossom contact and a grounding switch. Background Art

[0002] In the field of high-voltage electrical equipment, plum blossom contacts are key conductive sliding connection components, and their performance plays a decisive role in the operational stability and reliability of the entire equipment. Existing plum blossom contacts, such as those described in patents CN104900428A and CN204117867U, generally suffer from several issues that are difficult to ignore. Traditional plum blossom contacts are usually assembled from multiple independent components such as contact fingers, support frames, and tension springs. This structure results in low contact surface utilization and relatively high resistance. Taking the common plum blossom contact with an outsole spring, a copper stamped main current-carrying contact finger, and an aluminum frame as an example, its structure is complex and the assembly process is cumbersome. It requires the assistance of tooling and fixtures, which not only consumes a lot of manpower and material resources, but also increases the probability of error. In addition, because the spring is exposed, it is prone to annealing failure due to prolonged heat exposure, or the spring may fall off due to external factors. Once a short circuit fault occurs in the main circuit, a large short-circuit current is generated, and the contact fingers may scatter under the action of the strong electric force, causing the entire contact to explode, posing a huge safety risk to the high-voltage switch, seriously threatening the normal operation of the equipment and the personal safety of the operator. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide an integrated plum blossom contact and grounding switch.

[0004] The technical solution adopted by the present invention is as follows: an integrated plum blossom contact, including several metal conductive contacts, which are distributed in a ring shape. The metal conductive contacts have a front end and a rear end. The front ends and rear ends of adjacent metal conductive contacts are alternately connected to form a continuously bent integrated plum blossom contact body. The integrated plum blossom contact body is integrally formed. The integrated plum blossom contact body has a front end opening formed around the front end of the metal conductive contact and a rear end opening formed around the rear end of the metal conductive contact. The integrated plum blossom contact body can be elastically deformed to make the front end opening elastic.

[0005] The metal conductive contacts are tilted relative to the center axis L of the integrated plum blossom contact body. Adjacent metal conductive contacts are tilted in opposite directions relative to the center axis L and at equal angles, so that adjacent metal conductive contacts are connected to form a V-shaped structure.

[0006] The metal conductive contact piece has a contact protrusion in the middle, and the distance between the contact protrusions of the two metal conductive contact pieces on opposite sides is smaller than the distance between the front ends. The inner side surface of the metal conductive contact piece forms a first guiding surface between the front end and the contact protrusion, and the surface of the contact protrusion is an arc-shaped surface.

[0007] The connection portion between the two metal conductive contact pieces connected through the front end includes a contact finger section from the front end to the contact protrusion, so that the two metal conductive contact pieces connected through the front end form a contact finger with two roots.

[0008] The rear end has an inwardly protruding limiting protrusion, and a connecting section is formed between the contact protrusion and the rear end. The connecting section is in an outwardly convex arc shape, and the connecting section and the limiting protrusion have a rounded transition.

[0009] A grounding switch includes a static contact and a moving contact, wherein the static contact includes the integrated plum blossom contact as described above, and the front end opening of the integrated plum blossom contact body cooperates with the moving contact to allow the moving contact to be plugged in and out, and during the insertion of the moving contact, the front end opening is stretched open and the metal conductive contact piece is elastically abutted against the surface of the moving contact.

[0010] The static contact includes a static contact seat having a mounting groove for mounting the integrated plum blossom contact body, and the integrated plum blossom contact body does not protrude relative to the static contact seat in the mounting groove.

[0011] A certain distance is provided between the outer wall of the metal conductive contact piece and the inner wall of the installation groove in the closed state.

[0012] The metal conductive contact piece has a contact convex portion in the middle, the distance between the contact convex portions of two metal conductive contact pieces on opposite sides is smaller than the distance between the front ends, and the inner side surface of the metal conductive contact piece forms a first guiding surface between the front end and the contact convex portion; The movable contact has an annular groove that matches the contact protrusion, and a second guiding surface is provided at the front end of the annular groove; The surface of the contact convex portion is an arc-shaped surface, and the cross-section of the annular groove is an arc-shaped surface matching the contact convex portion.

[0013] The rear end has an inwardly protruding limiting protrusion; A fixing ring is provided in the static contact seat, a limiting annular groove is provided on the outer periphery of the fixing ring, and the limiting protrusion is located in the limiting annular groove; The fixing ring is fixedly connected to the static contact seat via a threaded fastener.

[0014] The beneficial effects of the present invention are as follows: The present invention provides an integrated plum blossom contact, i.e., a plum blossom contact formed solely from a single, integrally formed metal conductive member. Compared to conventional plum blossom contacts assembled from multiple independent components, such as contact fingers, support frames, and tension springs, the integrated plum blossom contact of the present invention utilizes an integrated molding process, eliminating components such as springs and support frames, reducing assembly steps, improving production efficiency, lowering costs, and avoiding the risk of elastic component failure. Furthermore, the integrated structure eliminates the risk of loosening and is adaptable to harsh environments such as high temperatures and vibrations. Furthermore, through a unique structural design, the integrated plum blossom contact relies solely on its own elasticity to provide effective contact pressure, ensuring a fatigue life that meets the operating standards of a high-voltage grounding switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0016] Figure 1 This is a schematic structural diagram of an integrated plum blossom contact according to an embodiment of the present invention; Figure 2 This is a front view of an integrated plum blossom contact according to an embodiment of the present invention; Figure 3 A cross-sectional view of an integrated plum blossom contact according to an embodiment of the present invention at one angle; Figure 4 A cross-sectional view of an integrated plum blossom contact according to an embodiment of the present invention from another angle; Figure 5 This is a schematic structural diagram of a grounding switch according to an embodiment of the present invention; Figure 6 is a cross-sectional view of a grounding switch according to an embodiment of the present invention; Figure 7 for Figure 6 A magnified schematic diagram of part A; Figure 8 This is a structural diagram of a static contact seat according to an embodiment of the present invention; Figure 9 This is a schematic structural diagram of a moving contact according to an embodiment of the present invention; Figure 10 This is a schematic structural diagram of a fixing ring according to an embodiment of the present invention; In the figure, metal conductive contact -100, front end -110, rear end -120, contact protrusion -130, first guiding surface -140, limiting protrusion -150, integrated plum blossom contact body -200, front end opening -210, rear end opening -220, moving contact -300, annular groove -310, second guiding surface -320, moving contact rotating frame -330, static contact seat -400, mounting groove -410, fixing ring -500, limiting annular groove -510, insulator -600, frame -700. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] The terms used herein, such as "up," "down," "front," "back," "left," "right," "inside," "outside," "top," "bottom," and "side," are intended solely to refer to the accompanying drawings. These terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit its scope.

[0019] The present invention provides an integrated plum blossom contact, comprising a plurality of metal conductive contact pieces 100, wherein the plurality of metal conductive contact pieces 100 are distributed in a ring shape and the plurality of metal conductive contact pieces 100 are connected as one. The purpose is to form the plum blossom contact through an integrated metal conductive part, eliminate the support frame, tension spring and other components of the traditional plum blossom contact, reduce the assembly process, improve production efficiency, reduce costs, and avoid the risk of elastic component failure. However, if the contact fingers of the traditional plum blossom contact are simply connected as one, it is not easy to meet the use requirements of the high-voltage switchgear. For example, all the contact fingers are connected as one through a bottom connecting ring, and the free ends of the contact fingers are plugged in and out of the moving contact. The integrated plum blossom contact formed in this way cannot guarantee effective contact pressure and meet the requirements of the grounding switch in the high-voltage switch cabinet for tens of thousands or even hundreds of thousands of plug-in and pull-out times. Therefore, the design difficulty of the integrated plum blossom contact is essentially how to meet the requirements of the grounding switch for contact pressure and fatigue life by only using a plum blossom contact composed of an integrated metal conductive part.

[0020] The integrated plum blossom contact provided by the present invention comprises a metal conductive contact piece 100 having a front end 110 and a rear end 120. The front ends and rear ends 120 of adjacent metal conductive contact pieces 100 are alternately connected to form an integrated plum blossom contact body 200 with continuous bending. Figure 1-Figure 2The figure shows a specific embodiment of the present invention. The integrated plum blossom contact body 200 has a front opening 210 formed around the front end 110 of the metal conductive contact 100 and a rear opening 220 formed around the rear end 120 of the metal conductive contact 100. The front opening 210 is used to cooperate with the movable contact 300 to allow the movable contact 300 to be inserted and removed. The integrated plum blossom contact body can be elastically deformed to make the front opening 210 elastic. When the movable contact 300 is inserted, it can be stretched open, so that the metal conductive contact 100 generates a certain elastic force and forms effective contact pressure with the movable contact 300. In this structure, during the insertion process of the movable contact, the entire integrated plum blossom contact body 200 will essentially bear the pressure of the movable contact 300 to stretch the front opening 210, thereby improving fatigue life.

[0021] like Figure 2 As shown, the metal conductive contact piece 100 is tilted relative to the direction of the central axis L of the integrated plum blossom contact body 200. The adjacent metal conductive contact pieces 100 are tilted in opposite directions relative to the central axis L and have the same tilt angle. The tilt relative to the central axis L here refers to Figure 2 From the perspective shown in the center main view, adjacent metal conductive contacts 100 on either side of the central axis L are tilted relative to the vertical central axis L, with the two metal conductive contacts 100 tilting in opposite directions and at equal angles. In this structure, adjacent metal conductive contacts 100 form an inverted V-shape with their upper ends connected, or a straight V-shape with their lower ends connected. The uniform, centrally symmetrical arrangement of the metal conductive contacts 100 ensures uniform stress distribution on each metal conductive contact 100 during the insertion of the moving contact.

[0022] like Figure 3 As shown, the metal conductive contact 100 has a contact protrusion 130 near the front end 110. The distance between the contact protrusions 130 of the two metal conductive contacts 100 on opposite sides is smaller than the distance between the front ends 110. The inner side of the metal conductive contact 100 forms a first guiding surface 140 between the front end 110 and the contact protrusion 130. The surface of the contact protrusion 130 is an arc-shaped surface, which can increase the contact pressure and area with the mating component and reduce friction damage during the plugging and unplugging process. Furthermore, the connection between the two metal conductive contacts 100 connected by the front end 110 includes a contact finger segment from the front end 110 to the contact protrusion 130, so that the two metal conductive contacts 100 connected by the front end 110 form a contact finger with two roots.

[0023] like Figure 4As shown, the rear end 120 has an inwardly protruding stopper 150. Between the contact protrusion 130 and the rear end 120 is a connecting section 160. This connecting section 160 is outwardly convex and has a rounded transition to the stopper 150. The stopper 150 is provided for the fixed installation of the integrated plum blossom contact. The rear end forms a composite structure of an arc-shaped transition and a micro-boss. The arc-shaped transition reduces stress concentration, while the micro-boss bears some of the load during insertion and removal, distributing stress from the root to the boss, preventing fatigue fracture at the root after long-term use.

[0024] The integrated plum blossom contact body 200 of the present invention adopts an integrated molding process to ensure the connection stability of each connection. Specifically, common contact materials such as copper alloy can be used. The integrated molding process can adopt precision forging technology, precision casting technology, metal powder injection molding technology, metal 3D printing technology and other processes.

[0025] Figure 5 The structure of a grounding switch is shown, which specifically includes a frame 700, an insulator 600 fixed to the frame 700, a static contact assembly fixed to the upper end of the insulator 600, a movable contact turret 330 rotatably set on the frame 700, and a movable contact 300 fixed to the movable contact turret 330. Driving the movable contact turret 330 to rotate can move the movable contact 300 closer to or farther away from the static contact assembly, thereby achieving closing and opening of the grounding switch.

[0026] like Figure 6 、 Figure 7 As shown, the static contact assembly includes a static contact seat 400 and an integrated plum blossom contact body 200 of the present invention. Figure 8 As shown, the static contact seat 400 has a mounting groove 410 for mounting the integrated plum blossom contact body 200. The integrated plum blossom contact body 200 does not protrude relative to the static contact seat 400 in the mounting groove 410. The front end opening 210 of the integrated plum blossom contact body 200 is close to the opening of the mounting groove 410, thereby cooperating with the moving contact 300 to allow the moving contact 300 to perform plugging and unplugging actions. When the moving contact 300 approaches, the moving contact 300 acts on the front end opening 210 of the integrated plum blossom contact body 200 and stretches the front end opening 210, and then inserts it into the inner cavity of the integrated plum blossom contact body 200, so that the metal conductive contact 100 elastically abuts against the surface of the moving contact 300. A certain distance is provided between the outer wall of the metal conductive contact 100 and the inner wall of the mounting groove 410 in the closed state and the open state.

[0027] Further, such as Figure 9As shown, the movable contact 300 has an annular groove 310 that cooperates with the contact protrusion 130 and a second guiding surface 320 is provided at the front end of the annular groove 310. The cross section of the annular groove 310 is an arc-shaped surface that cooperates with the contact protrusion 130 to achieve a larger contact area between the two.

[0028] Furthermore, a fixing ring 500 is provided in the static contact seat 400. Figure 10 As shown, the retaining ring 500 is provided with a limiting annular groove 510 on its outer circumference, and the limiting protrusion 150 is located within the limiting annular groove 510. The retaining ring 500 is fixedly connected to the static contact holder 400 via a threaded fastener. Specifically, the threaded fastener is a bolt and nut assembly. The limiting annular groove 510 is provided with a recess for accommodating the nut. The bolt passes through the mounting bracket on the insulator 600, the static contact holder 400, the retaining ring 500, and is threadedly connected to the nut.

[0029] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An integrated plum blossom contact, comprising a plurality of metal conductive contact pieces (100), wherein the plurality of metal conductive contact pieces (100) are distributed in a ring shape, and characterized in that: The metal conductive contact piece (100) has a front end (110) and a rear end (120), and the front ends and rear ends (120) of adjacent metal conductive contact pieces (100) are alternately connected to form a continuously bent one-piece plum blossom contact body (200). The one-piece plum blossom contact body (200) is integrally formed, and the one-piece plum blossom contact body (200) has a front end opening (210) formed around the front end (110) of the metal conductive contact piece (100) and a rear end opening (220) formed around the rear end (120) of the metal conductive contact piece (100). The one-piece plum blossom contact body (200) can be elastically deformed so that the front end opening (210) has elasticity.

2. The integrated plum blossom contact according to claim 1, characterized in that: The metal conductive contact pieces (100) are arranged tilted relative to the direction of the central axis L of the integrated plum blossom contact body (200); adjacent metal conductive contact pieces (100) are tilted in opposite directions relative to the central axis L and at equal tilt angles, so that adjacent metal conductive contact pieces (100) are connected to form a V-shaped structure.

3. The integrated plum blossom contact according to claim 1, characterized in that: The metal conductive contact piece (100) has a contact convex portion (130) near the front end (110), the spacing between the contact convex portions (130) of two metal conductive contact pieces (100) located on opposite sides is smaller than the spacing between the front ends (110), the inner side surface of the metal conductive contact piece (100) forms a first guiding surface (140) between the front end (110) and the contact convex portion (130), and the surface of the contact convex portion (130) is an arc-shaped surface.

4. The integrated plum blossom contact according to claim 3, characterized in that: The connection portion between the two metal conductive contact pieces (100) connected via the front end (110) includes a contact finger segment from the front end (110) to the contact protrusion (130), so that the two metal conductive contact pieces (100) connected via the front end (110) form a contact finger with two roots.

5. The integrated plum blossom contact according to claim 3, characterized in that: The rear end (120) has an inwardly protruding limiting protrusion (150), and a connecting section (160) is provided between the contact protrusion (130) and the rear end (120). The connecting section (160) is in an outwardly convex arc shape, and the connecting section (160) and the limiting protrusion (150) have a rounded transition.

6. A grounding switch comprising a static contact and a movable contact (300), characterized in that: The static contact comprises an integrated plum blossom contact as claimed in claim 1 or 2, wherein the front opening (210) of the integrated plum blossom contact body (200) cooperates with the moving contact (300) to allow the moving contact (300) to perform plugging and unplugging actions, and during the insertion process of the moving contact (300), the front opening (210) is stretched open and the metal conductive contact piece (100) is elastically abutted against the surface of the moving contact (300).

7. The grounding switch according to claim 6, characterized in that: The static contact comprises a static contact seat (400), the static contact seat (400) having a mounting groove (410) for mounting the integrated plum blossom contact body (200), and the integrated plum blossom contact body (200) does not protrude relative to the static contact seat (400) in the mounting groove (410).

8. The grounding switch according to claim 7, characterized in that: A certain distance is provided between the outer wall of the metal conductive contact piece (100) in the closed state and the inner wall of the installation slot (410).

9. The grounding switch according to claim 7, characterized in that: The metal conductive contact piece (100) has a contact convex portion (130) in the middle, the distance between the contact convex portions (130) of two metal conductive contact pieces (100) located on opposite sides is smaller than the distance between the front ends (110), and the inner side surface of the metal conductive contact piece (100) forms a first guiding surface (140) between the front end (110) and the contact convex portion (130); The movable contact (300) has an annular groove (310) that cooperates with the contact convex portion (130), and a second guiding surface (320) is provided at the front end of the annular groove (310); The surface of the contact convex portion (130) is an arc-shaped surface, and the cross-section of the annular groove (310) is an arc-shaped surface that matches the contact convex portion (130).

10. The grounding switch according to claim 7, characterized in that: The rear end (120) has an inwardly protruding limiting protrusion (150); A fixing ring (500) is provided in the static contact seat (400), a limiting annular groove (510) is provided on the outer periphery of the fixing ring (500), and the limiting protrusion (150) is located in the limiting annular groove (510); The fixing ring (500) is fixedly connected to the static contact seat (400) via a threaded fastener.

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