Switch shielding ring and three-position switch

Abstract

The utility model relates to the field of devices for preventing discharge to non-current-carrying components, in particular to a switch shielding ring and a three-position switch. The utility model is used for solving the problems in the prior art that after the shielding ring is sleeved at the end part of the conductor, the shielding ring and the conductor need to be coated by an insulating material, the manufacturing process is complicated, and the cost is higher. The switch shielding ring comprises an insulation shielding ring and a connecting ring arranged in the insulation shielding ring, a ring hole of the connecting ring is exposed out of the inner ring surface of the insulation shielding ring and is used for being connected with an electric conductor, the axial length of the connecting ring is smaller than that of the insulation shielding ring, and the two ends of the connecting ring are located in the insulation shielding ring. Therefore, the shielding ring wrapped by the insulating part can be used as an independent part to be installed at the end part of the electric conductor, the shielding ring with a smaller volume can be directly processed, the process is simple, and meanwhile, when the three-position switch is assembled, the assembly of the main body structure is not influenced by the shielding ring, and the manufacturing and assembly cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of devices for preventing discharge to non-current-carrying components, in particular to a switch shielding ring and a three-position switch. Background Art

[0002] The three-position switch is an important electrical component on the switchgear. In the prior art, a shielding ring is often installed at the end of the high-voltage conductor of the three-position switch to increase the withstand voltage of the high-voltage conductor. The Chinese utility model patent with the authorization announcement number CN202712019U discloses a three-position switch with an insulating layer coated on the outer surface. The three-position switch includes a grounding conductor, an intermediate conductor, and an isolation conductor, which are spaced in sequence and coaxially arranged. It also includes a screw that passes through the grounding conductor and the intermediate conductor. The other end of the screw is threadedly connected to the moving conductor to drive the moving conductor to move linearly when the screw rotates. Shielding rings are respectively installed at the right end of the grounding conductor and the left and right ends of the intermediate conductor, and an insulating layer is coated on the outer surfaces of the grounding conductor and the shielding ring, the intermediate conductor and the shielding ring, and the isolation conductor. In this way, the insulation requirements of the conductor under high voltage are met, the electric field at the end of the conductor is optimized, and the reliable operation of the product is achieved. However, in actual manufacturing, the shielding ring needs to be sleeved on the conductor and the whole formed by the two needs to be covered with insulating material. The process is complicated and difficult to process. In addition, the shielding ring and the insulating layer need to be respectively provided on the grounding conductor, the intermediate conductor and the isolation conductor before assembly can be carried out. The assembly efficiency is low, which increases the manufacturing cost. Utility Model Content

[0003] The present invention aims to provide a switch shielding ring that solves the problem in the prior art that, after the shielding ring is sleeved onto the end of a conductor, both need to be covered with insulating material, resulting in a complex manufacturing process and high cost. The present invention also aims to provide a three-position switch that solves the problem in the prior art that, after the shielding ring is installed on the end of a conductor in a three-position switch, both need to be covered with insulating material, resulting in a complex manufacturing process and high cost.

[0004] In order to solve the above technical problems, the switch shielding ring of the utility model includes an insulating shielding ring and a connecting ring arranged inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect with the conductor. The axial length of the connecting ring is smaller than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring.

[0005] The present invention addresses the problem in the prior art that after the shielding ring is sleeved on the end of the static contact, the two need to be covered with insulating material, resulting in a complex manufacturing process and high cost. A new technical solution is proposed. A connecting ring is provided inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect to the conductor. The axial length of the connecting ring is less than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring. In this way, the shielding ring can be installed as a separate part at the end of the conductor to optimize the electric field at the end of the conductor. Compared with the prior art, the present invention can directly process the smaller shielding ring, with a simple process, convenient manufacturing, and saved manufacturing costs. At the same time, when assembling the three-position switch, the assembly of the main structure is not affected by the shielding ring, saving manufacturing and assembly costs.

[0006] Furthermore, the connecting ring is a metal ring.

[0007] Furthermore, the insulating shielding ring is coated on the outside of the connecting ring by casting.

[0008] Furthermore, a threaded structure is provided on the ring hole of the connecting ring, and is fixedly connected to the conductor through the threaded structure.

[0009] Another aspect of the present invention provides a three-position switch, which includes a grounding static contact, an intermediate static contact, and an isolating static contact. A switch shielding ring is installed at at least one position of the end of the grounding static contact, the two ends of the intermediate static contact, and the end of the isolating static contact. The switch shielding ring includes an insulating shielding ring and a connecting ring arranged inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect to the conductor. The axial length of the connecting ring is smaller than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring.

[0010] The present invention addresses the problem in the prior art that after installing a shielding ring at the end of the conductor of a three-position switch, the conductor and the shielding ring still need to be covered with insulating material, resulting in a complex manufacturing process and high cost. A new technical solution is proposed. A connecting ring is provided inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect to the conductor. The axial length of the connecting ring is less than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring. In this way, the shielding ring can be installed as a separate part at the end of the conductor of the three-position switch to optimize the electric field at the end of the conductor. Compared with the prior art, the present invention can directly process the smaller shielding ring, which is simple to process, easy to manufacture, and saves manufacturing costs. At the same time, when assembling the three-position switch, the assembly of the main structure is not affected by the shielding ring, saving manufacturing and assembly costs.

[0011] Furthermore, the connecting ring is a metal ring.

[0012] Further, the insulating shielding ring is coated by pouring outside the connecting ring.

[0013] Further, the ring hole of the connecting ring is provided with a threaded structure, and is fixedly connected with the electric conductor through the threaded structure. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the switch shielding ring of the utility model;

[0015] Figure 2 It is Figure 1 It is a sectional view of A-A surface;

[0016] Figure 3 It is a structural schematic view of the switch shielding ring and the electric conductor connection of the utility model;

[0017] Figure 4 It is Figure 3 It is a sectional view of B-B surface;

[0018] Figure 5 It is a structural schematic view of the direct-acting type grounding switch of the utility model.

[0019] In the drawing: 1, insulating shielding ring; 2, connecting ring; 3, electric conductor; 4, switch shielding ring; 5, grounding conductor; 6, intermediate conductor; 7, isolation conductor; 8, moving contact; 9, screw rod. DETAILED DESCRIPTION

[0020] The Chinese utility model patent with the authorized announcement number CN202712019U discloses a three-station switch, the three-station switch includes three static contacts that are sequentially spaced and coaxially arranged and a moving contact that can be guided to move along the axis of the grounding conductor, the center conductor and the isolation conductor and can be in conductive contact with the three, a shielding ring is installed at the end of part of the static contact, and an insulating layer is coated on the outer surface of the shielding ring and the static contact. In this way, the insulating requirement of the electric conductor under high voltage is met, and reliable operation of the product is realized. However, in actual manufacturing, the shielding ring needs to be sleeved on the electric conductor, and the whole formed by the two is coated with insulating material, so the process is complex, the processing is difficult, the manufacturing cost is increased, and the shielding ring and the insulating layer need to be respectively arranged on the grounding conductor, the intermediate conductor and the isolation conductor before assembly, so the assembly efficiency is low, and the manufacturing cost is increased.

[0021] Based on the problems existing in the above-mentioned technical solutions, the present invention proposes a new technical solution. The core concept of the present invention is: a connecting ring is provided inside the insulating shielding ring, the ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect to the conductor, the axial length of the connecting ring is less than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring. In this way, the shielding ring can be installed as a separate part at the end of the conductor of the three-position switch to optimize the electric field at the end of the conductor. Compared with the existing technology, the present invention can directly process the smaller shielding ring, which is simple to process, easy to manufacture, and saves manufacturing costs. At the same time, when assembling the three-position switch, the assembly of the main structure is not affected by the shielding ring, saving manufacturing and assembly costs.

[0022] Based on the above utility model concept, a switch shielding ring of the utility model includes: Figure 1 、 Figure 2 The insulating shielding ring 1 and the connecting ring 2 disposed within it are shown. The insulating shielding ring is cylindrical, with a cylindrical outer surface and a smooth, curved contour at the transition from the outer surface to the side. The inner circumference is rounded at the ends, preventing tip discharge and optimizing the electric field around the insulating shielding ring. The annular hole of the connecting ring 2 exposes the inner surface of the insulating shielding ring 1 and is used to connect to the conductor 3. The axial length of the connecting ring 2 is shorter than that of the insulating shielding ring 1, and both ends of the connecting ring 2 are located within the insulating shielding ring 1. Thus, the insulating shielding ring 1 encloses the ends of the connecting ring 2, preventing tip discharge at the ends of the connecting ring 2 and improving the protective effectiveness of the insulating shielding ring 1. In this way, the switch shielding ring can be installed as a separate part at the end of the conductor 3 to optimize the electric field at the end of the conductor 3, which helps to improve the overall stability and reliability of the equipment and reduce the equipment failure rate due to electrical problems. The utility model can directly process smaller shielding rings, with simple processes and convenient manufacturing, saving manufacturing costs. At the same time, the connection structure of the switch shielding ring makes it easier to disassemble and assemble it with the conductor, saving installation and maintenance costs.

[0023] In this embodiment, the connecting ring 2 is a cylindrical ring, and the distances between the two ends of the connecting ring 2 and the two ends of the insulating shielding ring 1 are not consistent. Figure 3 、 Figure 4As shown, the distance between the end of the connecting ring 2 where the moving contact is inserted and the end of the insulating shielding ring 1 is greater than the distance between the end of the connecting ring 2 where the conductor 3 is connected and the end of the insulating shielding ring 1. Furthermore, in this embodiment, the axial length of the connection portion between the conductor 3 and the connecting ring 2 is consistent with the axial length of the connecting ring 2, and a step is provided at the end of the connection portion to stop the connection between the conductor 3 and the connecting ring 2. When the conductor 3 is connected to the connecting ring 2, the end of the conductor 3 is also located at the end of the connecting ring 2, that is, the conductive contact portion between the conductor 3 and the moving contact is also located at the end of the connecting ring 2. Under high voltage conditions, corona may occur around the conductive contact portion. This arrangement allows the conductive contact portion to be located inside the insulating member, maximizing the insulation of the equipment and ensuring safe operation of the equipment. At the same time, the end of the connecting ring 2 near the conductive contact portion is located inside the insulating shielding ring 1, avoiding local discharge caused by the tip of the connecting ring 2 end, thereby ensuring the shielding effect of the insulating shielding ring 1.

[0024] In this embodiment, the connecting ring 2 is a metal ring. The metal ring has excellent electrical conductivity and can further even out the electric field at the conductive contact portion when the conductor 3 and the moving contact are in conductive contact, thereby preventing tip discharge and corona. Furthermore, in other embodiments, the connecting ring can also be made of a semiconductor material or an insulating material.

[0025] In this embodiment, the insulating shielding ring 1 is coated on the outside of the connecting ring 2 by casting. In this way, the insulating shielding ring 1 and the connecting ring 2 can fit tightly together, avoiding the phenomenon of electric field concentration caused by the presence of air gaps or bubbles at the junction between the two when the conductor 3 and the moving contact are in conductive contact. At the same time, the one-piece insulating shielding ring 1 will not have any process defects during manufacturing and has good processability. In addition, in other embodiments, the connecting ring can also be bonded to the inner ring surface of the insulating shielding ring. Of course, a threaded structure can also be provided on the outer ring surface of the connecting ring and the inner ring surface of the insulating shielding ring to achieve a reliable connection between the two through threads.

[0026] In this embodiment, the connection structure is a threaded structure on the ring hole of the connecting ring 2. The inner surface of the connecting ring 2 is provided with internal threads, and the end of the conductor 3 is provided with external threads. This threaded structure provides a secure connection between the two. Furthermore, in other embodiments, the connecting ring can also be bonded or welded to the end of the conductor. Of course, in other embodiments, the connecting ring can also be forcefully attached to the end of the conductor.

[0027] Another aspect of the present invention provides a three-position switch, the three-position switch comprising: Figure 5The grounding static contact 5, the intermediate static contact 6 and the isolating static contact 7 are coaxially arranged and spaced in sequence, and also include a screw 9 that crosses the grounding static contact 5 and the intermediate static contact 6. One end of the screw is sealed with the grounding static contact 5, and the other end is threadedly connected to the moving contact 8. In this way, when the screw rotates, the moving contact 8 can be guided and moved along the axis of the grounding static contact 5, the intermediate static contact 6 and the isolating static contact 7. The end of the grounding static contact 5, the two ends of the intermediate static contact 6 and the end of the isolating static contact 7 are provided with contact fingers. When the moving contact 8 moves to the intermediate static contact 6 and the isolating static contact When the moving contact 8 is between the contacts 7, the contact fingers at both ends of the moving contact 8 contact with the contact fingers at the ends of the middle static contact 6 and the isolating static contact 7, and the three-position switch is in the isolating closing position; when the moving contact 8 moves to the inner cavity of the middle static contact 6, the contact fingers at both ends of the moving contact 8 contact with the contact fingers at both ends of the middle static contact 6, and the three-position switch is in the isolating opening position; when the moving contact 8 moves to the middle of the middle static contact 6 and the grounding static contact 5, the contact fingers at both ends of the moving contact 8 contact with the contact fingers at the ends of the middle static contact 6 and the grounding static contact 5, and the three-position switch is in the grounding closing position. A shielding ring is installed at at least one position at the end of the grounding static contact 5, the ends of the middle static contact 6, and the end of the isolating static contact 7. The specific structure of the shielding ring is the same as that of the switch shielding ring 4, so it will not be repeated here.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A switch shielding ring, characterized in that: It includes an insulating shielding ring and a connecting ring arranged inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect with the conductor. The axial length of the connecting ring is smaller than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring.

2. The switch shielding ring according to claim 1, characterized in that: The connecting ring is a metal ring.

3. The switch shielding ring according to claim 1 or 2, characterized in that: The insulating shielding ring is covered on the outside of the connecting ring by casting.

4. The switch shielding ring according to claim 1 or 2, characterized in that: A thread structure is provided on the ring hole of the connecting ring, and is fixedly connected to the conductor through the thread structure.

5. A three-position switch, characterized in that: It includes a grounding static contact, an intermediate static contact and an isolating static contact. A switch shielding ring is installed at at least one position of the end of the grounding static contact, the two ends of the intermediate static contact and the end of the isolating static contact. The switch shielding ring includes an insulating shielding ring and a connecting ring arranged inside the insulating shielding ring. The ring hole of the connecting ring exposes the inner ring surface of the insulating shielding ring and is used to connect with the conductor. The axial length of the connecting ring is smaller than the axial length of the insulating shielding ring, and both ends of the connecting ring are located inside the insulating shielding ring.

6. The three-position switch according to claim 5, characterized in that: The connecting ring is a metal ring.

7. The three-position switch according to claim 5 or 6, characterized in that: The insulating shielding ring is covered on the outside of the connecting ring by casting.

8. The three-position switch according to claim 5 or 6, characterized in that: A thread structure is provided on the ring hole of the connecting ring, and is fixedly connected to the conductor through the thread structure.

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