Double-shielding structure, vacuum arc-extinguishing chamber and solid insulator

Abstract

The utility model relates to the field of switch contact operating mechanisms, and provides a double-shielding structure, a vacuum arc-extinguishing chamber and a solid insulator, and the double-shielding structure comprises a middle cover plate, an inner shielding net and an outer shielding net. The middle cover plate is connected with a fracture needing to be shielded; the inner shielding net is sleeved on the middle cover plate and is positioned in the fracture; the outer shielding net is sleeved outside the inner shielding net, and the two ends of the outer shielding net are at least sleeved on the outer edges of the two ends of the fracture. And the chamber body can be coated outside the vacuum arc extinguishing chamber in a pouring or assembling manner. By designing the shielding net at the connection point between the insulator and the shielding cover plate, the connection point between the insulator and the cover plate can be shielded, the problem of poor electrical performance of the connection point is eliminated, and the safety and reliability of the vacuum arc-extinguishing chamber are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical shielding, in particular to a double shielding structure, a vacuum interrupter and a solid insulator. Background Art

[0002] In electrical equipment, electrical shielding is often required at the disconnection point (such as between adjacent insulators) to meet electrical requirements.

[0003] Taking a vacuum circuit breaker as an example, the structure of the vacuum circuit breaker includes a solid insulator and a vacuum interrupter which are cast or assembled into a mold. Then, the vacuum interrupter and its conductive connection isolate main conductive encapsulation modules such as disconnector switches, earthing switches, main busbars and branch busbars, forming a module with full insulation and full sealing performance. The surface that can be touched by people is coated with a conductive or semi-conductive shielding layer, which can be directly and reliably grounded ring main unit and similar related structure products. At present, for the shielding scheme of the vacuum interrupter in the market, due to technical limitations, nylon shielding nets or aluminum covers are usually used for shielding at the moving end and the static end of the product. The two ends of the shielding net are connected by screws, and for the middle section, the sealing electrode powder is welded. Due to technical reasons, it is chosen not to be processed, which limits the electrical requirements, especially for higher requirements of higher voltage levels. If it is used in a high-voltage environment, there are structural defects, which are likely to cause electrical problems in the product, such as partial discharge, power frequency or impulse and other problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double shielding structure, aiming at improving and solving the problem of electrical defects at the electrical disconnection point.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions: A double shielding structure, comprising:

[0006] An intermediate cover plate, which is connected to the disconnection point to be shielded;

[0007] An inner shielding net, which is sleeved on the intermediate cover plate and is located in the disconnection point;

[0008] An outer shielding net, which is sleeved outside the inner shielding net, and at least both ends of the outer shielding net are sleeved on the outer edges at both ends of the disconnection point.

[0009] Further, at least one end of the inner shielding net is provided with an inwardly turned-up portion that abuts against the outer shielding net.

[0010] Further, the inner shielding net is arranged in a semi-open structure, and the outer shielding net is a sleeve structure with both ends conducting.

[0011] A vacuum interrupter is also disclosed, which includes an insulator and a breaking port that divides the insulator into two parts, and the breaking port is provided with the double shielding structure as described above.

[0012] Further, it further includes an upper cover plate disposed at the top end of the insulator and a lower cover plate disposed at the bottom end of the insulator. An inlet terminal shielding net is disposed above the upper cover plate, and an outlet terminal shielding net is disposed below the lower cover plate.

[0013] Further, it further includes a rubber coating layer that coats the outer surfaces of the insulator, the upper cover plate, and the lower cover plate.

[0014] Further, it further includes an inlet contact and a moving contact that docks or separates from the inlet contact. The inlet contact is fixed on the lead-out port of the upper cover plate, and the moving contact is connected to the lead-out port of the lower cover plate through a bellows.

[0015] Further, metallized welding surfaces are provided on the end surfaces of the insulator and the breaking port, and the middle cover plate is welded to the breaking port;

[0016] The upper cover plate is welded between the upper end surface of the insulator and the inlet contact;

[0017] One end of the lower cover plate is welded to the lower end surface of the insulator, and the other end of the lower cover plate is hermetically sealed on the bellows.

[0018] A solid insulator is also disclosed, which includes the vacuum interrupter as described above and a chamber body cast on the vacuum interrupter.

[0019] Further, a grounding layer is provided on the outer side surface of the chamber body.

[0020] After adopting the above technical solutions, compared with the background technology, the present utility model has the following advantages:

[0021] 1. The present utility model proposes a double shielding structure for the welding joint of the electrical breaking port. Through the double shielding of the inner shielding net and the outer shielding net, the problem of poor electrical connection at the connection point in the middle section is eliminated, so that it meets the higher electrical requirements of higher voltage levels;

[0022] 2. The double shielding net structure of the present utility model is simple in structure, and the inner shielding net adopts a semi-open structure, which is easy to assemble;

[0023] 3. The contour shape of the vacuum arc-extinguishing chamber of the present utility model is composed of an insulator and a shielding cover plate. Then, an inner shielding net is installed on the middle cover plate at the fracture, and an outer shielding net is sleeved outside the inner shielding net. An inlet terminal shielding net is installed at the upper cover plate, and an outlet terminal shielding net is installed at the lower cover plate to form a vacuum arc-extinguishing chamber inside the chamber body, and the chamber body can be coated outside the vacuum arc-extinguishing chamber by pouring or assembling. Through the design of the shielding net, the connection points between the insulator and the cover plate can be shielded, eliminating the problem of poor electrical connection at the connection points and improving the safety and reliability of the vacuum arc-extinguishing chamber;

[0024] 4. The present utility model is provided with a rubber coating layer outside the vacuum arc-extinguishing chamber, so that the insulation performance between the insulator and the chamber body is good, reducing the shrinkage effect of the product caused by thermal cycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the double shielding structure described in the present utility model;

[0026] Figure 2 is a structural diagram of the inner shielding net described in the present utility model;

[0027] Figure 3 is a structural cross-sectional view of the vacuum arc-extinguishing chamber described in the present utility model;

[0028] Figure 4 is a partial structural diagram of the vacuum arc-extinguishing chamber described in the present utility model;

[0029] Figure 5 is a structural cross-sectional view of the solid insulator of the present utility model without the chamber body being poured;

[0030] DESCRIPTION OF THE REFERENCE NUMERALS:

[0031] 10. Chamber body; 101. Vacuum arc-extinguishing chamber; 102. Inlet terminal shielding net; 103. Outlet terminal shielding net; 104. Outer shielding net; 105. Inner shielding net; 106. Inlet terminal; 107. Grounding layer;

[0032] 1011. Inlet contact; 1012. Moving contact; 1013. Bellows;

[0033] 1051. Inner turned-up part;

[0034] 20. Insulator; 201. Fracture; 202. Rubber coating layer;

[0035] 30. Shielding cover plate; 301. Upper cover plate; 302. Middle cover plate; 303. Lower cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more explicit, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] In addition, it should be noted that: The terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element of the present utility model must have a specific orientation. Therefore, it should not be construed as a limitation of the present utility model.

[0038] When an element is referred to as "fixed to" or "arranged on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] Unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] Please refer to Figure 1 and Figure 2 As shown, this embodiment provides a double shielding structure, which includes an intermediate cover plate 302, an inner shielding net 104 and an outer shielding net 104. Among them, the inner shielding net 105 is sleeved on the intermediate cover plate 302 and is located in the fracture 201; for the outer shielding net 104, the outer shielding net 104 is sleeved outside the inner shielding net 105, and the length of the outer shielding net 104 is greater than the length of the fracture 201, so that its two ends are sleeved at least on the outer edges of both ends of the fracture 201.

[0042] In this embodiment, the inner shielding net 105 is arranged in a semi-open structure and tightly holds the intermediate cover plate 302. The outer shielding net 104 is a sleeve structure with both ends conducting, so as to form a complete closed whole-net structure. Through size control, the outer shielding net 104 is tightly pressed on the inner shielding net 104 to form effective contact.

[0043] In this embodiment, an inwardly turned-up portion 1051 that abuts against the outer shielding net 104 is provided at at least one end of the inner shielding net 105. The inwardly turned-up portion 1051 can be a rolled circle, so that an open circular ring protrusion is formed at each end of the inner shielding net 105. During installation, it is installed on the middle cover plate 302 through the opening, and then the outer shielding net 104 is installed by sleeving. The dimensions of both ends of the outer shielding net 104 are strictly controlled in the middle area to form a coverage of the solder joints; and there are gaps at both ends. Since the inner shielding net 105 is in a semi-closed state, it can be easily installed through the deformation of the shielding net. The outer shielding net 104 is installed by sleeving from the upper end down through reasonable dimension design, and is tightly pressed onto the two inwardly turned-up portions 1051 of the inner shielding net 105 to form an abutting contact. The height of the outer shielding net 104 is higher than the welded part of the fracture 201, achieving effective connection and completely shielding the solder joints at the same time.

[0044] Embodiment 2

[0045] Please refer to Figure 3 - Figure 4 As shown, this embodiment provides a vacuum interrupter, including an insulator 20 and a shielding cover plate 30. A fracture 201 that divides the insulator 20 into two parts is provided in the middle of the insulator 20; the shielding cover plate 30 includes an upper cover plate 301 provided between the top end of the insulator 20 and the incoming line port of the vacuum arc extinguishing chamber 101, a middle cover plate 302 provided on the fracture 201, and a lower cover plate 303 provided between the bottom end of the insulator 20 and the outgoing line port of the vacuum arc extinguishing chamber 101; an incoming line end shielding net 102 is provided in the chamber body 10 corresponding to the upper cover plate 301, an outgoing line end shielding net 103 is provided in the chamber body 10 corresponding to the lower cover plate 303, an outer shielding net 104 is provided in the chamber body 10 corresponding to the middle cover plate 302, an inner shielding net 105 is provided on the middle cover plate 302, and the inner shielding net 105 is located between the outer shielding net 104 and the middle cover plate 302; the length of the outer shielding net 104 is greater than the length of the fracture 201, so that at least both ends of it are sleeved on the outer edges of both ends of the fracture 201.

[0046] In this embodiment, the insulator 20 can be made of ceramic material.

[0047] Subsequently, at the connection points between the insulator 20 and the upper cover plate 301, the insulator 20 and the middle cover plate 302, and the insulator 20 and the lower cover plate 303, they can be hermetically connected by welding. For each connection point, the incoming line end shielding net 102, the outgoing line end shielding net 103, and the outer shielding net 104 are installed correspondingly to eliminate the problems of electrical defects (such as partial discharge, power frequency or impulse, etc.) existing at the connection points, so as to ensure the safety and reliability of the vacuum interrupter.

[0048] Further, on the end faces of the insulator 20 and the fracture 201 in this embodiment, there are metallized welding surfaces (not marked in the figure), and the middle cover plate 302 is welded and arranged on the fracture 201; the upper cover plate 301 is welded and arranged between the upper end face of the insulator 20 and the incoming line contact 1011; one end of the lower cover plate 303 is welded and arranged on the lower end face of the insulator 20, and the other end of the lower cover plate 303 is hermetically arranged on the corrugated pipe 1013.

[0049] The manufacturing steps of the vacuum interrupter are as follows:

[0050] First, form the outer frame of the vacuum arc extinguishing chamber 101 through the insulator 20 and the shielding cover plate 30 (as Figure 2 shown). That is, the middle cover plate 302 is fixed on the fracture 201 by high-temperature silver welding; similarly, the upper cover plate 301 and the lower cover plate 303 are also connected by high-temperature silver welding. The lower cover plate 303 and the corrugated pipe 1013 can be hermetically connected by means of a sealing ring to complete the assembly and fixation of the outer contour of the vacuum arc extinguishing chamber 101.

[0051] Second, install the corresponding shielding nets at the positions of the corresponding welding points (i.e., the above connection points) to prevent electrical problems (as Figure 3 shown). That is, first, the inner shielding net 105 is sleeved on the middle end plate, and then the outer shielding net 104 is sleeved. The length of the outer shielding net 104 is greater than the length of the fracture 201, forming an effect of shielding the solder joints at the fracture 201 (there will be defects such as sharp corners, non-bonding, and dead corners after welding). Similarly, the solder joints at the upper cover plate 301 have an incoming line end shielding net 102, and the solder joints at the lower cover plate 303 have an outgoing line end shielding net to eliminate the electrical problems caused by the solder joints.

[0052] Specifically, as Figure 1 and Figure 2 shown, a double-layer shielding net structure is adopted for the welding points at the fracture 201. In this embodiment, the inner shielding net 105 is arranged in a semi-open structure and tightly holds the middle cover plate 302 of the vacuum interrupter. The outer shielding net 104 is a sleeve structure with both ends conducting, used for a complete closed whole-net structure. Through size control, the inner shielding net 105 tightly presses between the outer shielding net 104 and the vacuum interrupter to form an effective contact.

[0053] As Figure 2As shown in the figure, in this embodiment, an inwardly turned and rolled-up portion 1051 that abuts against the outer shielding net 104 is provided at at least one end of the inner shielding net 105. The inwardly turned and rolled-up portion 1051 can be a rolled circle, so that an open ring protrusion is formed at each end of the inner shielding net 105. During installation, it is installed on the intermediate cover plate 302 through the opening, and then the outer shielding net 104 is installed by sleeving. The dimensions of both ends of the outer shielding net 104 are strictly controlled in the intermediate area of the vacuum interrupter to form a coverage of the solder joints; and there are gaps at both ends. Since the inner shielding net 105 is in a semi-closed state, it can be easily installed through the deformation of the shielding net. The outer shielding net 104 is designed with reasonable dimensions and is sleeved and installed from the upper end of the vacuum interrupter, tightly pressed onto the two inwardly turned and rolled-up portions 1051 of the inner shielding net 105 to form an abutting contact. The height of the outer shielding net 104 is higher than the welded part of the vacuum interrupter, achieving effective connection while completely shielding the solder joints.

[0054] Through the deformable characteristics of the shielding net, the outer shielding net 104 is pressed onto the inner shielding net 105. The inner shielding net 105 is tightly pressed onto the intermediate shielding cover plate 30 of the vacuum interrupter through the compression of the outer shielding, so that the three metal nets (outer shielding net 104, inner shielding net 105, and intermediate end plate) are tightly connected. The defects of the welding and pouring processes of the vacuum interrupter are shielded by the outer shielding net, and the problems of poor electricity in the vacuum interrupter are eliminated.

[0055] Further, as Figure 3 shown in the figure, in this embodiment, an incoming line contact 1011 with one end fixed on the lead-out port of the upper cover plate 301 is provided in the vacuum arc extinguishing chamber 101; a moving contact 1012 that is docked or separated from the incoming line contact is provided at the lead-out port of the vacuum arc extinguishing chamber 101, and a bellows 1013 is provided between the moving contact 1012 and the lead-out port.

[0056] As Figure 4 shown in the figure, this embodiment further includes a rubber coating layer. The rubber coating layer 202 is a hierarchical structure formed by a silicone-based glue, covering the outer surfaces of the insulator (20), the upper cover plate (301), and the lower cover plate (303). In this way, the bonding between the ceramic material insulator 20 and the epoxy resin chamber body can be formed, ensuring good insulation performance between the epoxy resin chamber body and the silicone, between the silicone and the ceramic, and being less affected by the shrinkage of the product due to thermal cycling, improving the practicality and safety of use.

[0057] Embodiment III

[0058] Please refer to Figure 5 shown in the figure. This embodiment provides a solid insulator, including the vacuum interrupter described in Embodiment I and a chamber body 10 poured on the vacuum interrupter.

[0059] In this embodiment, the vacuum interrupter can eliminate the problem of poor electrical performance of the product caused by the solder joints in the vacuum interrupter, that is, problems such as partial discharge, power frequency or impulse, etc., and improve the safety and reliability of the vacuum circuit breaker.

[0060] In this embodiment, the chamber body 10 can be made of epoxy resin material, providing functions such as insulation, support and fixation for the internal vacuum arc extinguishing chamber 101. It is molded by pouring in a mold to inject an epoxy resin material chamber body 10 outside the vacuum arc extinguishing chamber 101 (as Figure 1 shown), thus completing the manufacturing process of the vacuum interrupter.

[0061] As Figure 1 shown, in this embodiment, an incoming line terminal 106 is arranged inside the incoming line port of the vacuum arc extinguishing chamber 101. The incoming line terminal 106 can be a copper-made power connection block, used as a connection point for the entry of voltage and current.

[0062] As Figure 1 shown, in this embodiment, a grounding layer 107 is arranged on the outer side surface of the chamber body 10. The grounding layer 107 can be a conductive zinc layer, a conductive tin layer or a conductive semiconductor nano-coating, etc., and can be connected to the grounding layer 107 for grounding to ensure personal touch safety.

[0063] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A double shielding structure, characterized in that, Comprising: An intermediate cover plate (302), the intermediate cover plate (302) being connected to the break (201) to be shielded; An inner shielding net (105), the inner shielding net (105) being sleeved on the intermediate cover plate (302) and located in the break (201); An outer shielding net (104), the outer shielding net (104) being sleeved outside the inner shielding net (105), and at least both ends of the outer shielding net (104) being sleeved on the outer edges of both ends of the break (201).

2. The double shielding structure according to claim 1, wherein: At least one end of the inner shielding net (105) is provided with an inwardly turned-up portion (1051) that abuts against the outer shielding net (104).

3. The double shielding structure according to claim 1, characterized in that: The inner shielding net (105) is arranged in a semi-open structure, and the outer shielding net (104) is a sleeve structure with both ends conducting.

4. A vacuum interrupter, characterized in that: Comprising an insulator (20) and a break (201) that divides the insulator (20) into two parts, and the break (201) is provided with the double shielding structure according to any one of claims 1-3.

5. The vacuum interrupter according to claim 4, wherein: Further comprising an upper cover plate (301) arranged at the top end of the insulator (20) and a lower cover plate (303) arranged at the bottom end of the insulator (20), an inlet terminal shielding net (102) is arranged above the upper cover plate (301), and an outlet terminal shielding net (103) is arranged below the lower cover plate (303).

6. The vacuum interrupter according to claim 5, wherein: Further comprising a rubber coating layer (202), the rubber coating layer (202) covering the outer surfaces of the insulator (20), the upper cover plate (301) and the lower cover plate (303).

7. The vacuum interrupter according to claim 5, characterized in that: Further comprising an inlet contact (1011) and a moving contact (1012) that docks or separates from the inlet contact (1011), the inlet contact (1011) is fixed on the lead-out port of the upper cover plate (301), and the moving contact (1012) is connected to the lead-out port of the lower cover plate through a bellows (1013).

8. The vacuum interrupter according to claim 7, characterized in that: A metallized welding surface is provided on the end face of the insulator (20) and the end face of the break (201), and the intermediate cover plate (302) is welded to the break (201); The upper cover plate (301) is welded between the upper end face of the insulator (20) and the inlet contact (1011); One end of the lower cover plate (303) is welded to the lower end face of the insulator (20), and the other end of the lower cover plate (303) is hermetically arranged on the bellows (1013).

9. A solid insulator, characterized in that: Comprising a vacuum interrupter according to any one of claims 4-8 and a chamber body (10) cast on the vacuum interrupter.

10. The solid insulator according to claim 9, characterized in that: A grounding layer (107) is provided on the outer side surface of the chamber body (10).

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