Isolating switch contact seat structure with shielding function
By installing a detachable shield and contact structure on the disconnector switch contact base, the problem of uneven electric field distribution is solved, resulting in better insulation performance and economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 国电博纳(北京)电力设备有限公司
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional contact structure can easily lead to uneven electric field distribution during electrical connection, affecting insulation performance.
Design a shielded disconnect switch contact structure, including a detachably connected shield and a contact. The shield is connected to the contact through a clearance hole, and the inner wall is provided with a spring finger groove. The shield is made of aluminum with a thickness of 1-2 mm and a smooth surface to avoid electric field concentration.
It improves the insulation performance of the contact base, reduces its size, lowers production costs, and uses lightweight and environmentally friendly materials.
Smart Images
Figure CN224190865U_ABST
Abstract
Description
A shielded disconnector contact structure Technical Field
[0001] This utility model belongs to the field of high voltage switch technology, specifically, it relates to a shielded isolating switch contact structure. Background Technology
[0002] Gas-insulated metal-enclosed switchgear (GIS) plays an irreplaceable role in modern power systems due to its significant advantages of small footprint, high reliability, and ease of maintenance. As a core component of GIS, the disconnecting switch undertakes crucial responsibilities such as isolating power sources, performing switching operations, and ensuring maintenance safety. The contact structure is the key to achieving electrical connections within the disconnecting switch, and its performance directly affects the stability and reliability of the GIS equipment.
[0003] Traditional contactor structures rely solely on the contact base to establish an electrical connection with the contact. However, if the contact base is positioned too close to other conductors, it can negatively impact the electric field distribution, leading to uneven electric field distribution and poor contact base insulation performance. Therefore, improving the insulation performance of contactor structures has become a pressing issue for those skilled in the art. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a shielded isolating switch contact base structure, including: a detachably connected shielding cover and a contact base;
[0005] The main body of the contact seat is cylindrical. One end of the contact seat has a cavity for accommodating the grounding switch contact, and the other end of the contact seat has a protruding connecting part.
[0006] The shielding cover is fitted with a contact seat, and the top of the shielding cover has a clearance hole that is opposite to the cavity of the contact seat, which is suitable for making way for the grounding switch contact.
[0007] The connecting part has a connecting hole that communicates with the cavity of the contact base, which is suitable for connecting the contact base to external equipment.
[0008] In one possible implementation, a spring finger groove is provided on the inner sidewall of the contact seat, and the spring finger groove is suitable for placing the spring finger.
[0009] In one possible implementation, two spring contact finger slots are provided, and the two spring contact finger slots are arranged adjacent to each other on the inner sidewall of the contact seat.
[0010] In one possible implementation, the shielding cover includes a shielding head and a shielding tail. The shielding head has an arc-shaped cross-section, and the shielding tail has an annular plate-like structure whose outer diameter matches the bottom diameter of the shielding head.
[0011] In one possible implementation, two or more first mounting holes are provided on the side of the contact seat where the connecting portion is located, and the two or more first mounting holes are arranged sequentially around the circumference of the contact seat.
[0012] In one possible implementation, the shield tail has two or more second mounting holes along its circumference;
[0013] The second mounting hole corresponds one-to-one with the first mounting hole, so that the shielding cover and the contact base can be connected through the first mounting hole and the second mounting hole.
[0014] In one possible implementation, the thickness of the shielding cover ranges from 1 to 2 mm.
[0015] In one possible implementation, the shield is made of aluminum.
[0016] Beneficial effects: The contact structure of this application, by setting a shield and fastening the shield onto the contact, effectively isolates the electric field distribution of the contact itself from other electric fields, making the electric field distribution of the contact itself more uniform and effectively improving the insulation of the contact. Moreover, the contact in the shielded disconnector contact structure of this application is cylindrical, which is smaller in volume than the traditional elliptical contact, effectively reducing production costs and improving economic efficiency.
[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description
[0018] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:
[0019] Figure 1 is a cross-sectional view of a shielded isolating switch contact structure according to an embodiment of the present invention;
[0020] Figure 2 is a schematic diagram of a traditional contact seat;
[0021] Figure 3 is a cross-sectional view of a contact seat according to an embodiment of the present invention;
[0022] Figure 4 is a top view of a shielding cover according to an embodiment of the present invention;
[0023] Figure 5 is a cross-sectional view of a shielding cover according to an embodiment of the present invention;
[0024] Figure 6 is a schematic diagram showing the connection between this utility model and other devices;
[0025] Figure 7 is a side view of one side of the contact structure connection portion according to an embodiment of the present invention;
[0026] The attached diagram lists the components represented by each number as follows:
[0027] Shielding cover 100, shielding head 110, clearance hole 111, shielding tail 120, contact seat 200, chamber 210, connecting part 220, connecting hole 221, first mounting hole 222, spring contact finger groove 230, second mounting hole 240, basin insulator 300, housing 400.
[0028] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation
[0029] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.
[0030] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application or to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0032] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.
[0033] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.
[0034] Figure 1 shows a cross-sectional view of a shielded disconnector contact structure according to this application. Referring to Figure 1, this application provides a shielded disconnector contact structure, including a detachably connected shield 100 and a contact 200. The main body of the contact 200 is cylindrical. One end of the contact 200 has a cavity 210 for accommodating a grounding switch contact, and the other end of the contact 200 has a protruding connecting portion 220. The shield 100 is fastened to the contact 200. The top of the shield 100 has a clearance hole 111, which is opposite to the cavity 210 of the contact 200, and is suitable for making way for the grounding switch contact. The connecting portion 220 has a connecting hole 221, which communicates with the cavity 210 of the contact 200, and is suitable for connecting the contact 200 to equipment.
[0035] The shield 100 has a smooth surface, which is suitable for preventing electric field concentration; the contact base 200 is suitable for electrically connecting the contacts to external equipment.
[0036] Figure 2 shows a schematic diagram of a conventional contact base. Referring to Figure 2, this application, by setting a shield 100 and fastening it onto the contact base 200, can effectively isolate the contact base's own electric field from other electric fields, thus not affecting the contact base's own electric field distribution, thereby effectively improving the contact base's insulation. Furthermore, the smooth surface of the shield 100 avoids sharp edges and corners, effectively preventing electric field concentration, further improving the contact base's insulation. Moreover, the contact base 200 of this application is smaller in size and easier to process than conventional contact bases, effectively reducing production costs.
[0037] In one possible implementation, the chamber 210 is cylindrical and expands outward along the opening of the contact seat 200.
[0038] In one possible implementation, the contact 200 matches the clearance hole 111 provided in the shield 100, so that the contact 200 extends into the inner cavity of the shield 100 through the clearance hole 111, and the window of the clearance hole 111 abuts against the side edge of the contact 200 away from the connecting portion 220, thereby fastening the shield 100 onto the contact 200.
[0039] In one possible implementation, as shown in Figure 3, a spring finger groove 230 is provided on the inner sidewall of the contact base 200. The spring finger groove 230 is suitable for placing a spring finger. The spring finger is used to press the contact firmly when the contact is inserted into the cavity 210 of the contact base 200, so as to ensure the stability of the contact between the contact and the contact base 200.
[0040] In one possible implementation, two spring finger grooves 230 are provided, and the two spring finger grooves 230 are arranged adjacent to each other on the inner wall of the contact seat 200.
[0041] In one possible implementation, as shown in Figures 4 and 5, the shield 100 includes a shield head 110 and a shield tail 120. The shield head 110 has an arc-shaped cross-section, and the shield tail 120 has an annular plate structure with its outer diameter matching the bottom diameter of the shield head 110. The shield tail 120 is designed to be integrally formed with the bottom of the shield head 110. It should be noted that the central hole of the shield tail 120 matches the connecting portion 220 of the contact 200, so that the connecting portion 220 of the contact 200 passes through the central hole of the shield tail 120, and the main body of the contact 200 is engaged on the inner surface of the shield tail 120.
[0042] In one possible implementation, two or more first mounting holes 222 are provided on the side of the contact base 200 where the connecting portion 220 is located, and the two or more first mounting holes 222 are arranged sequentially around the circumference of the contact base 200. The central axis of each of the two or more first mounting holes 222 is parallel to the central axis of the contact base 200.
[0043] In one possible implementation, the first mounting hole 222 has 6 openings.
[0044] In one possible implementation, the shield tail 120 has two or more second mounting holes 240 along its circumference, and the second mounting holes 240 correspond one-to-one with the first mounting holes 222, so as to connect the shield cover 100 and the contact seat 200 through the first mounting holes 222 and the second mounting holes 240.
[0045] In one possible implementation, the second mounting hole 240 has 6 openings.
[0046] In one possible implementation, when assembling the contact 200 and the shield 100, the contact 200 is inserted into the inner cavity of the shield 100 through the clearance hole 111 at the top of the shield 100, with the window of the clearance hole 111 abutting against the edge of the shield 100 opposite to the connecting portion 220. Simultaneously, the connecting portion 220 of the contact 200 protrudes from the inner cavity of the shield 100 through the central hole at the tail of the shield 100, and the contact 200 is secured to the tail portion 120 of the shield, thus securing the contact 200 within the inner cavity of the shield 100. Furthermore, the first mounting hole 222 and the second mounting hole 240 are aligned one-to-one, thereby achieving a detachable connection between the contact 200 and the shield 100 via bolts.
[0047] In one possible implementation, the thickness of the shield 100 ranges from 1 to 2 mm. It should be noted that the thickness of the shield is selected based on the actual electric field strength and shielding effect, and is preferably 2 mm.
[0048] In one possible implementation, the shield 100 is made of aluminum, preferably aluminum 1060. Compared to shields 100 made of other materials, aluminum 1060 shields 100 can form a dense aluminum oxide film on their surface, resulting in better corrosion resistance. Furthermore, aluminum 1060 shields 100 are lighter than materials such as iron and copper, effectively reducing component weight and thus lessening the burden on equipment. Simultaneously, aluminum 1060 shields 100 have high recyclability, with a recycling rate only about 5% of the energy consumption in primary aluminum production. After recycling, they can be processed into other products through rolling, extrusion, forging, and stretching, which helps conserve resources and protect the environment.
[0049] In one possible implementation, Figure 6 shows a schematic diagram of the connection between the contact of this application and other devices. Referring to Figure 6, by aligning the connection hole 221 of the connection portion 220 of the contact of this application with the mounting hole of the basin insulator 300, a screw is inserted through the cavity 210 of the contact and the contact is mounted on the basin insulator 300 through the connection hole 221 and the mounting hole of the device. The basin insulator 300 with the contact mounted is then connected to the device housing 400 so that the contact is mounted on the device for use.
[0050] In one possible implementation, a screw within the connection hole 221 electrically connects an external device to a contact, thereby enabling conductivity.
[0051] In one possible implementation, as shown in Figure 7, four connection holes 221 are provided.
[0052] Therefore, this application provides a shielded disconnector contact structure. This contact, through the combination of a shield 100 and a contact 200, effectively improves the insulation performance of the contact. Specifically, the main body of the contact 200 in this application is a cylindrical structure, which is smaller in volume than traditional contactors. Furthermore, the shield 100, which matches the contact 200, has a smooth surface, avoiding electric field concentration caused by sharp edges, thereby effectively improving the insulation performance of the contact. The thickness of the shield 100 is further set to a range of 1-2 mm, allowing adjustment of the thickness according to actual shielding performance requirements to optimize the insulation performance of the contact, thus effectively improving its insulation properties.
[0053] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A shielded disconnector contact structure, characterized in that, include: A detachable shield and a contact base are provided; the main body of the contact base is cylindrical, one end of the contact base has a cavity for accommodating a grounding switch contact, and the other end of the contact base has a protruding connecting part; the shield is fastened to the contact base, and the top of the shield is provided with a clearance hole that is opposite to the cavity of the contact base, which is suitable for making way for the grounding switch contact; the connecting part is provided with a connecting hole that communicates with the cavity of the contact base, which is suitable for connecting the contact base to an external device.
2. The shielded disconnector contact structure according to claim 1, characterized in that, A spring finger groove is provided on the inner side wall of the contact seat, and the spring finger groove is suitable for placing a spring finger.
3. The shielded disconnector contact structure according to claim 2, characterized in that, The spring contact finger groove is provided in two places, and the two spring contact finger grooves are arranged adjacent to each other on the inner side wall of the contact seat.
4. The shielded disconnector contact structure according to claim 1, characterized in that, The shielding cover includes a shielding head and a shielding tail. The shielding head has an arc-shaped cross-section, and the shielding tail has an annular plate structure with an outer diameter that matches the bottom diameter of the shielding head.
5. The shielded disconnector contact structure according to claim 4, characterized in that, Two or more first mounting holes are provided on the side of the contact seat where the connecting part is located, and the two or more first mounting holes are arranged sequentially around the circumference of the contact seat.
6. The shielded disconnector contact structure according to claim 5, characterized in that, The shield tail has two or more second mounting holes along its circumference; the second mounting holes correspond one-to-one with the first mounting holes, so as to connect the shield to the contact seat through the first mounting holes and the second mounting holes.
7. The shielded disconnector contact structure according to claim 1, characterized in that, The thickness of the shielding cover ranges from 1 to 2 mm.
8. The shielded disconnector contact structure according to claim 1, characterized in that, The shielding cover is made of aluminum.