Three-position switch and GIS

Abstract

The invention relates to the technical field of three-position switches, in particular to a three-position switch and a GIS. The three-position switch comprises an installation plate used for being installed on a gas box, a grounding contact is fixed to the installation plate, a moving contact supporting seat is further installed on the installation plate in a suspended mode through a first-stage insulation supporting rod set perpendicular to the installation plate, the moving contact supporting seat and the grounding contact are coaxial, and a moving contact is assembled in the moving contact supporting seat in a sliding mode. The other side of the moving contact supporting seat is coaxially provided with an isolation contact supporting seat through a secondary insulation supporting rod group, and the secondary insulation supporting rod group and the primary insulation supporting rod group are arranged in parallel. The isolating contact supporting seat, the moving contact supporting seat and the grounding contact are coaxially assembled to form a compact and highly integrated three-position switch, and the occupied length of the three-position switch in the axial direction is only the distance between the isolating contact supporting seat and the mounting plate, so that the axial occupied space of the three-position switch is reduced, and the service life of the three-position switch is prolonged. The miniaturization of the three-position switch and the further compression of the volume are realized.

Description

Technical Field

[0001] The invention relates to the technical field of three-position switches, and in particular to a three-position switch and a GIS. Background Art

[0002] The three-position switch integrates the functions of an isolating switch and a grounding switch, and can realize the operation of three working positions: the closing position, the isolating position and the grounding position. In the prior art, for example, the Chinese invention patent with the authorization announcement number CN109859980B discloses an inflatable cabinet and a direct-acting three-position switch thereof, wherein the direct-acting three-position switch comprises a single-phase switch module, the single-phase switch module comprises an isolating contact seat, a grounding contact seat, a moving contact seat and a moving contact guided and slidably assembled on the moving contact seat, and the direct-acting three-position switch also comprises a module insulating support plate capable of fixing the three-phase switch, the module insulating support plate is U-shaped, specifically comprising a horizontal support plate and a left vertical support plate and a right vertical support plate respectively fixed at both ends thereof, the right vertical support plate being used for fixed connection with the gas chamber, the moving contact seat being fixed on the horizontal support plate, the grounding contact seat being fixedly mounted on the right vertical support plate, and the isolating contact seat being fixed on the left vertical support plate.

[0003] However, the module insulating support plate used for coaxially fixing the isolating contact seat, the grounding contact seat and the moving contact seat in the above-mentioned direct-acting three-position switch includes a horizontal support plate and a left vertical support plate and a right vertical support plate on both sides. The existence of these support plates occupies additional space, which inevitably increases the occupied volume of the switch module, thereby affecting the miniaturization of the three-position switch, is not conducive to reducing the space occupied by GIS equipment, and does not conform to the current development trend. Summary of the invention

[0004] The object of the present invention is to provide a three-position switch to solve the problem that the modular insulating support plate for fixing the contacts of the three-position switch in the prior art occupies extra space, which affects the miniaturization of the three-position switch. The object of the present invention is also to provide a GIS including the above three-position switch to solve the problem that the modular insulating support plate for fixing the contacts of the three-position switch in the prior art occupies extra space, which further increases the space occupied by the GIS equipment.

[0005] To achieve the above-mentioned purpose, the technical solution of the three-position switch provided by the present invention is: the three-position switch includes a mounting plate for installation on the gas box, a grounding contact is fixed on the mounting plate, and the mounting plate is also suspended with a moving contact support seat through a primary insulating support rod group perpendicular to it, the moving contact support seat is coaxial with the grounding contact and the moving contact is slidably assembled therein, and an isolating contact support seat is coaxially mounted on the other side of the moving contact support seat through a secondary insulating support rod group, and the secondary insulating support rod group is arranged parallel to the primary insulating support rod group.

[0006] As a further improvement, the isolating contact support seat and the moving contact support seat are both cross-shaped support seats.

[0007] As a further improvement, the primary insulating support rod group and the secondary insulating support rod group are staggered in the up-and-down directions of the moving contact support seat.

[0008] As a further improvement, the first-level insulating support rod group and the second-level insulating support rod group both include insulating support rods symmetrically arranged at the upper and lower ends of the moving contact support seat, and the second-level insulating support rod group is at the end position of the moving contact support seat, and the first-level insulating support rod group is arranged on the inner side of the second-level insulating support rod group.

[0009] As a further improvement, a first stop structure is provided on the moving contact support seat for cooperating with the end of the insulating support rod for positioning.

[0010] As a further improvement, a second stop structure is provided on the isolating contact support seat for cooperating with the end of the insulating support rod for positioning.

[0011] As a further improvement, the first stop structure and the second stop structure are connecting members with grooves or annular protrusions.

[0012] As a further improvement, the moving contact has a central inner hole, a transmission screw is passed through the central inner hole, and the other end of the transmission screw is used to be connected to the operating mechanism.

[0013] As a further improvement, the moving contact is a rod-shaped conductor, and the middle parts of the isolating contact support seat and the moving contact support seat both have an adaptive cylindrical inner cavity.

[0014] The beneficial effect is: the present invention provides a new three-position switch, which can coaxially fix the isolating contact support seat, the moving contact support seat and the grounding contact on the mounting plate by arranging a primary insulating support rod group and a secondary insulating support rod group between the mounting plate and the isolating contact support seat, thereby forming a compact and highly integrated three-position switch module, and the primary and secondary insulating support rod groups do not exceed the radial outside of the moving contact support seat and the isolating contact support seat. The radial length occupied by the three-position switch module is only the radial length of the moving contact support seat and the isolating contact support seat, and the axial length occupied is only the distance between the isolating contact support seat and the mounting plate. No other connecting parts are required on the outside of the isolating contact support seat. Compared with the prior art, the overall occupied space of the three-position switch is reduced, realizing the miniaturization of the three-position switch and further compression of the volume, which is beneficial to optimize and improve the internal space utilization rate of GIS equipment.

[0015] To achieve the above-mentioned purpose, the technical solution of GIS provided by the present invention is: GIS includes an air box, the air box is filled with dry air, a three-position switch is installed on the air box, the three-position switch includes a mounting plate for mounting on the air box, a grounding contact is fixed on the mounting plate, the mounting plate is also suspended with a moving contact support seat through a primary insulating support rod group perpendicular to the mounting plate, the moving contact support seat is coaxial with the grounding contact and the moving contact is slidably mounted therein, and an isolating contact support seat is coaxially mounted on the other side of the moving contact support seat through a secondary insulating support rod group, and the secondary insulating support rod group is arranged in parallel with the primary insulating support rod group.

[0016] As a further improvement, the isolating contact support seat and the moving contact support seat are both cross-shaped support seats.

[0017] As a further improvement, the primary insulating support rod group and the secondary insulating support rod group are staggered in the up-and-down directions of the moving contact support seat.

[0018] As a further improvement, the first-level insulating support rod group and the second-level insulating support rod group both include insulating support rods symmetrically arranged at the upper and lower ends of the moving contact support seat, and the second-level insulating support rod group is at the end position of the moving contact support seat, and the first-level insulating support rod group is arranged on the inner side of the second-level insulating support rod group.

[0019] As a further improvement, a first stop structure is provided on the moving contact support seat for cooperating with the end of the insulating support rod for positioning.

[0020] As a further improvement, a second stop structure is provided on the isolating contact support seat for cooperating with the end of the insulating support rod for positioning.

[0021] As a further improvement, the first stop structure and the second stop structure are connecting members with grooves or annular protrusions.

[0022] As a further improvement, the moving contact has a central inner hole, a transmission screw is passed through the central inner hole, and the other end of the transmission screw is used to be connected to the operating mechanism.

[0023] As a further improvement, the moving contact is a rod-shaped conductor, and the middle parts of the isolating contact support seat and the moving contact support seat both have an adaptive cylindrical inner cavity.

[0024] The beneficial effect is as follows: the present invention provides a GIS improved on the basis of the prior art, in which a brand-new three-position switch is installed. The three-position switch can coaxially fix the isolating contact support seat, the moving contact support seat and the grounding contact on the mounting plate by means of a primary insulating support rod group and a secondary insulating support rod group arranged between the mounting plate and the isolating contact support seat, thereby forming a compact and highly integrated three-position switch module. Moreover, the primary and secondary insulating support rod groups do not exceed the radial outer sides of the moving contact support seat and the isolating contact support seat. The radial length occupied by the three-position switch module is only the radial length of the moving contact support seat and the isolating contact support seat, and the axial length occupied is only the distance between the isolating contact support seat and the mounting plate. No other connecting parts are required on the outer side of the isolating contact support seat. Compared with the prior art, the overall occupied space of the three-position switch is reduced, thereby realizing the miniaturization of the three-position switch and further compressing its volume, which is beneficial to optimizing and improving the internal space utilization rate of the GIS equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional structural diagram of an embodiment of a three-position switch provided by the present invention; Figure 2 A side view of an embodiment of a three-position switch provided by the present invention; Figure 3 The figure is a side view of an embodiment of a three-position switch provided by the present invention during assembly.

[0026] In the figure: 1. Mounting plate; 2. Grounding contact; 3. Moving contact support seat; 4. Isolating contact support seat; 5. Moving contact; 6. Insulating support rod; 7. Transmission screw; 8. Connecting piece. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] The direct-acting three-position switch disclosed in the prior art cited in the background technology installs and fixes the moving contact seat and the isolating contact seat through the module insulating support plate, but the left vertical support plate outside the isolating contact seat and the horizontal support plate at the bottom, as the main components of the module insulating support plate, occupy additional space, and their size and shape directly determine the overall profile of the three-position switch, making it difficult to further reduce the three-position switch, resulting in a decrease in space utilization in GIS equipment, further increasing the space occupied by GIS equipment, and affecting the layout planning of power grid facilities. Based on this, the present invention provides a three-position switch and GIS to solve the problems existing in the above-mentioned prior art.

[0029] The overall design concept of the three-position switch and GIS provided by the present invention is: using the mounting plate and the insulating rod group to realize the coaxial arrangement of the grounding contact, the moving contact support seat, and the isolating contact support seat, forming a compact and independent three-position switch module, realizing miniaturization and efficient assembly.

[0030] Specifically, as a basic technical solution, Figure 1-3 As shown, the GIS includes an air box, and the three-position switch is installed on the air box through a mounting plate 1. The mounting plate 1 also constitutes one side of the air box wall. The air box is filled with dry air. This GIS is an environmentally friendly product. The three-position switch also includes a grounding contact 2, a moving contact support seat 3 equipped with a moving contact, and an isolating contact support seat 4 equipped with an isolating contact. The grounding contact 2 is fixed on the mounting plate 1, and the moving contact support seat 3 is suspended on the mounting plate 1 through a primary insulating support rod group perpendicular to the mounting plate 1. The other side of the moving contact support seat 3 is fixed with an isolating contact support seat 4 through a secondary insulating support rod group also perpendicular to the mounting plate 1, thereby realizing the coaxial assembly of the grounding contact 2, the moving contact support seat 3, and the isolating contact support seat 4. When the moving contact 5 is in the inner cavity of the moving contact support seat 3 and the isolating contact support seat 4 at the same time, the circuit closing is realized; when the moving contact 5 is only in the inner cavity of the moving contact support seat 3, the circuit opening is realized; when the moving contact 5 is in the inner cavity of the moving contact support seat 3 and the grounding contact 2 at the same time, the grounding closing is realized.

[0031] The isolation contact support seat 2 and the moving contact support seat 3 can be fixed on the mounting plate through the primary insulating support rod group and the secondary insulating support rod group, and are coaxial with the grounding contact 4, forming a compact, highly integrated independent three-position switch module, and the primary and secondary insulating support rod groups are located between the mounting plate 1 and the isolation contact support seat 4, and do not exceed the radial extension length of the moving contact support seat and the isolation contact support seat. The radial length occupied by the three-position switch module is the radial extension length of the moving contact support seat and the isolation contact support seat, and the occupied axial length is only the distance from the mounting plate to the isolation contact support seat. The side of the isolation contact support seat away from the mounting plate does not require additional connectors, thereby reducing the overall space occupied by the three-position switch and realizing the miniaturization of the three-position switch. When the three-position switch is assembled in the GIS equipment, the saved space can be used for the arrangement of other electrical or mechanical components, which is conducive to further realizing the miniaturization of the GIS equipment, thereby adapting to the development needs of the power grid.

[0032] Secondly, the three-position switch reduces unnecessary support structures and connectors, thereby reducing the number of connection points between components, reducing possible fault points during assembly and connection, and reducing the risk of failure caused by poor or loose connections. Not only does it improve the structural stability of the three-position switch, but it also integrates the various components of the three-position switch into an integrated module, making the assembly process more intuitive and simple. The three-position switch module can be pre-debugged, so the on-site assembly time of GIS equipment is greatly shortened. Operators only need to install the debugged three-position switch directly into the gas box, which is conducive to improving the overall project progress and reducing labor costs.

[0033] Based on the overall introduction of the GIS of the present invention above, a more specific embodiment is provided below on the basis of the overall introduction: This embodiment focuses on a detailed description of a primary insulating support rod group and a secondary insulating support rod group.

[0034] In order to further save the occupied length of the three-position switch in the axial direction, the primary insulating support rod group and the secondary insulating support rod group are staggered in the vertical direction of the moving contact support seat 3. In this embodiment, in order to facilitate the arrangement of the two-stage insulating rod group, the isolation contact support seat 1 and the moving contact support seat 3 are both cross-shaped support seats, and the primary insulating support rod group and the secondary insulating support rod group connected to the left and right sides of the moving contact support seat 3 are respectively connected to different positions in the vertical direction of the moving contact support seat 3, which also avoids mutual interference between the primary and secondary insulating support rod groups.

[0035] Specifically, both the first-level insulating support rod group and the second-level insulating support rod group include insulating support rods 6. Compared with the support plates in the prior art, the insulating support rods 6 occupy a smaller area, thereby further simplifying the overall structure of the three-position switch and reducing the overall weight of the three-position switch.

[0036] In order to improve the stability of the three-position switch during assembly and operation, insulating support rods 6 are symmetrically arranged in the upper and lower directions of the moving contact support seat 3 for connection with the mounting plate 1. Correspondingly, the moving contact support seat 3 and the isolating contact support seat 4 are also connected by insulating support rods 6 symmetrically arranged on the upper and lower sides of the moving contact support seat 3. More specifically, the first-level insulating support rod group includes four insulating support rods 6, and the two insulating support rods 6 are symmetrically distributed on the upper and lower sides of the moving contact support seat 3 with the center of the moving contact support seat 3 as the center, thereby improving the connection stability between the moving contact support seat 3 and the mounting plate 1. The second-level insulating support rod group includes four insulating support rods 6, and the two insulating support rods 6 are also symmetrically distributed on the upper and lower sides of the moving contact support seat 3, thereby improving the assembly stability of the isolating contact support seat 4. Of course, in the actual assembly process, an appropriate number of insulating support rods can be selected according to the level of the GIS equipment. In this embodiment, each group has four insulating support rods, which can achieve stable assembly of the three-position switch. Of course, in other embodiments, the primary insulating support rod group and the secondary insulating support rod group may also include six or eight insulating support rods, respectively realizing stable assembly with the moving contact support seat and the isolating contact support seat on the mounting plate.

[0037] In a more preferred embodiment, the secondary insulating support rod group is arranged at the positions of both ends of the moving contact support seat 3, and the primary insulating support rod group is located inside the secondary insulating support rod group, thereby further improving the installation stability of the isolation contact support seat. Figure 2 As shown, when both the primary and secondary insulating support rod groups include four insulating support rods 6 symmetrically arranged in the upper and lower parts, every two insulating support rods 6 are arranged horizontally in parallel, and the four insulating support rods connecting the isolating contact support seat 4 and the moving contact support seat 3 are located on the outside of the four insulating support rods between the moving contact support seat 3 and the mounting plate 1, thereby avoiding interference, making the insulating support rods on both sides of the moving contact support seat better fixed on the moving contact support seat, and reducing the occupied length in the axial direction. Of course, in other embodiments, the secondary insulating support rod group can also be set at the end position of the moving contact support seat, and the primary insulating support rod group can be set on the inner side of the secondary insulating support rod group, which can still reduce the occupied length in the axial direction of the three-position switch.

[0038] Based on the overall introduction of the GIS of the present invention above, a more specific embodiment is provided below on the basis of the overall introduction: This embodiment focuses on a detailed description of how to improve the assembly accuracy of the moving contact support seat and the isolating contact support seat.

[0039] like Figure 1-3As shown, a first stop structure is provided on the moving contact support seat 3, and after one end of the insulating support rod 6 in the above-mentioned first-level insulating support rod group is fixed to the mounting plate 1 by welding or bolts, the other end of the insulating support rod 6 is installed in cooperation with the first stop structure. Correspondingly, a second stop structure is provided on the isolating contact support seat 4, and the two ends of the insulating support rod 6 are installed in cooperation with the first and second stop structures respectively. The positioning stop serves as an accurate position mark on the moving contact support seat 3 and the isolating contact support seat 4, and can cooperate with the end of the insulating support rod 6 to ensure accurate positioning during the process of fixing the moving contact support seat 3 and the isolating contact support seat 4, and the cooperation between the insulating support rod 6 and the moving contact support seat 3 and the isolating contact support seat 4 limits the possible deviation of the moving contact support seat 3 during the working process, thereby ensuring the long-term stable operation of the three-position switch. It also reduces the adjustment and calibration work during the installation process, making the installation process of the three-position switch more concise and efficient.

[0040] In this embodiment, if Figure 3 As shown, the first stop structure and the second stop structure can both be connectors 8 fixed on the moving contact support seat 3 and the isolating contact support seat 4. Of course, the connector 8 can also be fixed on the mounting plate to fix the primary insulating support rod group. Specifically, a groove is provided on the connector 8, and the end of the insulating support rod 6 can be inserted into the groove of the connector 8 for assembly. Or the connector 8 has an annular protrusion, whose inner diameter is slightly smaller than the diameter of the insulating support rod 6, and can be assembled with the insulating support rod 6 by inserting it to form an interference fit. The above-mentioned connector 8 with a groove or annular protrusion is easy to install with the insulating support rod 6, which is conducive to the rapid assembly of the three-position switch. And the connection is reliable, reducing the risk of failure caused by poor contact or loose components.

[0041] Based on the overall introduction of the GIS of the present invention above, a more specific embodiment is provided below on the basis of the overall introduction: This embodiment focuses on the detailed description of the specific structure of the contacts in the three-position switch.

[0042] like Figure 1-2 As shown, both the isolating contact support seat 4 and the moving contact support seat 3 are cross-shaped support seats, which are not only conducive to the arrangement of the two-stage insulating rod group, that is, the vertical extension sections of the isolating contact support seat 4 and the moving contact support seat 3 are used for the arrangement of the two-stage insulating rod group, and the horizontal extension sections are the inner cavities for the moving contact to be installed and moved, and also make it possible to have no other obstacles between the single-phase switch modules. At the same time, the moving contact installed in the inner cavity of the moving contact support seat has a central inner hole, and the central inner hole is penetrated by a transmission screw 7, and the other end of the transmission screw 7 is used to connect with the operating mechanism, and the moving contact is opened and closed through the operating mechanism.

[0043] In this embodiment, the moving contact 5 is a rod-shaped conductor, and accordingly, the middle of the isolating contact support seat 4 and the moving contact support seat 3 both have an adapted cylindrical inner cavity. The rod-shaped conductor is a regular geometric shape such as a cylinder. Compared with conductors of other complex shapes, the rod-shaped conductor reduces the electric field distortion caused by the irregular shape of the conductor. Electric field distortion is a phenomenon in which the local electric field strength increases abnormally, which may cause local discharge or breakdown, and the rod-shaped conductor maintains the uniformity of the electric field by reducing the electric field distortion.

[0044] The specific structure of the three-position switch embodiment of the present invention is the same as the three-position switch structure in the GIS embodiment introduced above, and will not be described in detail herein.

[0045] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0046] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A three-position switch, characterized in that: It includes a mounting plate for installation on the gas box, a grounding contact is fixed on the mounting plate, and a moving contact support seat is suspended on the mounting plate through a primary insulating support rod group perpendicular to the mounting plate. The moving contact support seat is coaxial with the grounding contact and the moving contact is slidably mounted therein. An isolating contact support seat is coaxially mounted on the other side of the moving contact support seat through a secondary insulating support rod group. The secondary insulating support rod group is arranged parallel to the primary insulating support rod group.

2. The three-position switch according to claim 1 is characterized in that: The isolating contact support seat and the moving contact support seat are both cross-shaped support seats.

3. The three-position switch according to claim 2 is characterized in that: The primary insulating support rod group and the secondary insulating support rod group are staggered in the up-and-down directions of the moving contact support seat.

4. The three-position switch according to claim 3 is characterized in that: The first-level insulating support rod group and the second-level insulating support rod group both include insulating support rods symmetrically arranged at the upper and lower ends of the moving contact support seat, and the second-level insulating support rod group is located at the end position of the moving contact support seat, and the first-level insulating support rod group is arranged on the inner side of the second-level insulating support rod group.

5. The three-position switch according to claim 4 is characterized in that: The moving contact support seat is provided with a first stop structure for cooperating with the end of the insulating support rod for positioning.

6. The three-position switch according to claim 5 is characterized in that: The isolating contact support seat is provided with a second stop structure for cooperating with the end of the insulating support rod for positioning.

7. The three-position switch according to claim 6 is characterized in that: The first stop structure and the second stop structure are connecting parts with grooves or annular protrusions.

8. The three-position switch according to any one of claims 1 to 7, characterized in that: The moving contact has a central inner hole, a transmission screw rod is passed through the central inner hole, and the other end of the transmission screw rod is used to be connected with the operating mechanism.

9. The three-position switch according to claim 8, characterized in that: The moving contact is a rod-shaped conductor, and the middle parts of the isolating contact support seat and the moving contact support seat are both provided with an adaptive cylindrical inner cavity.

10. A GIS, comprising an air box, characterized in that: The air box is filled with dry air, and a three-position switch as described in any one of claims 1 to 9 is installed on the air box.

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