A three-phase common-box type three-position disconnector with earthing function

Abstract

The present invention belongs to the technical field of isolating and grounding switches, and relates to a three-phase common-box type three-position isolating and grounding switch, comprising a housing, within which are disposed three sets of isolating and grounding devices and a three-phase linkage device; the housing comprises a main tube, on which are disposed three pairs of mutually perpendicular horizontal and vertical support tubes; each set of isolating and grounding devices comprises a vertical isolating static contact, a vertical moving contact, a horizontal isolating static contact, a horizontal moving contact, and a grounding static contact; the vertical moving contact and the horizontal moving contact are arranged vertically within a moving contact support seat, the vertical isolating static contact being disposed within an upper support tube, the support tube being disposed within a lower support tube, the horizontal isolating static contact being disposed within a rear support tube, and the grounding static contact being disposed within a front support tube; the three-phase linkage device comprising a transmission shaft and three gear transmission devices, the gear transmission devices being disposed on the transmission shaft. This solves the problems of current three-phase common-box isolating switches, such as large housings, heavy weight, and high costs, and the need for busbar power outages for on-site GIS expansion and maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of isolating and grounding switches, and relates to a three-phase common box type three-station isolating and grounding switch. Background Art

[0002] At present, with the development of the electric power economy, GIS products are increasingly used. GIS products of high voltage level 252kV and above mainly adopt a three-phase sub-box structure. The three-phase sub-box structure has the characteristics of large footprint, large number of gas chambers, high probability of gas leakage and long installation and maintenance cycle, which reduces the reliability of GIS and increases manufacturing costs and subsequent operation and maintenance costs.

[0003] Existing three-phase common housing structures are either three-phase continuous casting or cylindrical with three phases arranged in a triangle. Three-phase continuous casting common housings have smaller dimensions at the intersections between adjacent cylinders, resulting in a smaller outer surface and weaker heat dissipation. Furthermore, due to the larger dimensions of three-phase straight-line casting, the process is difficult and the yield rate is low, which increases the housing cost. In contrast, cylindrical housings with a three-phase triangular arrangement accumulate heat in the three-phase flow circuit, causing a rapid rise in heat inside the housing. This places higher demands on the housing's heat dissipation efficiency, requiring a sufficiently large surface area. Furthermore, due to the longer interphase insulation distances for high-voltage products of 252kV and above, the diameter of the three-phase common cylindrical housing is larger, increasing the volume and weight of the cylindrical housing, which in turn increases the weight of the entire GIS product and the gas volume used in the air chamber, thus increasing costs.

[0004] The shell structure is affected by the internal disconnector structure, and it is difficult to improve the structure. In addition, the structural designs of major mainstream GIS at home and abroad are basically the same, that is, there is only one isolation fracture between the spare expansion bay or the in-operation bay and the operating busbar. During operation, it is easy to cause discharge and breakdown of the isolation fracture, causing personal injury and equipment failure. Therefore, the busbar of the previously built project needs to be shut down, which will extend the construction period, waste manpower and material resources, and cause direct or indirect economic losses after the power outage. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-phase common box type three-station isolating grounding switch to solve the problems of large housing and heavy weight of the current three-phase common box isolating switch, high cost of the three-phase separate box isolating switch, and the need for busbar power outage for on-site GIS expansion and maintenance.

[0006] The present invention is achieved through the following technical solutions:

[0007] A three-phase common box type three-position isolating and grounding switch, comprising a housing and a drive device arranged outside the housing, three sets of isolating and grounding devices and a three-phase linkage device are arranged inside the housing; the three sets of isolating and grounding devices are connected through the three-phase linkage device;

[0008] The outer shell includes a main cylinder, on which are provided three pairs of mutually perpendicular horizontal and vertical support cylinders. Two interfaces are provided along the axial direction of the main cylinder, and the drive device is installed at one of the interfaces. The vertical support cylinders include an upper support cylinder located above the main cylinder and a lower support cylinder located below the main cylinder. The horizontal support cylinders include a rear support cylinder located behind the main cylinder and a front support cylinder located in front of the main cylinder.

[0009] Each set of isolation and grounding devices includes a vertical isolation static contact, a vertical moving contact, a moving contact support seat, a horizontal isolation static contact, a horizontal moving contact, a grounding static contact and a support cylinder; the moving contact support seat is fixed to the support cylinder; the vertical moving contact and the horizontal moving contact are vertically arranged in the moving contact support seat, the vertical moving contact is located between the vertical isolation static contact and the support cylinder; the horizontal moving contact is located between the horizontal isolation static contact and the grounding static contact;

[0010] The vertical isolating static contact is arranged in the upper support tube, the supporting tube is arranged in the lower support tube, the horizontal isolating static contact is arranged in the rear support tube, and the grounding static contact is arranged in the front support tube;

[0011] The three-phase linkage device includes a transmission shaft and three gear transmission devices. The gear transmission device is arranged on the transmission shaft. Each gear transmission device is correspondingly arranged in the moving contact support seat to simultaneously drive the vertical moving contact and the horizontal moving contact to reciprocating linear motion.

[0012] Furthermore, the horizontal support tubes are distributed in a line at equal distances along the axis of the main tube, and the vertical support tubes are distributed in a line at equal distances along the axis of the main tube.

[0013] Furthermore, the vertical moving contact and the horizontal moving contact are arranged vertically and coplanarly;

[0014] The gear transmission device includes a first gear, a second gear, a first rack and a second rack; the first rack is arranged in a vertical direction, the second rack is arranged in a horizontal direction, and the first rack and the second rack are staggered;

[0015] The first gear and the second gear are arranged on the transmission shaft, the first gear is engaged with the first rack, the second gear is engaged with the second rack, the vertical moving contact is fixedly connected to the top of the first rack, and the second rack is arranged on the outer surface of the horizontal moving contact.

[0016] Furthermore, a cross bar is provided at the top end of the first rack, the vertical moving contact is fixed on the cross bar, and the vertical moving contact and the horizontal moving contact are arranged vertically and coplanarly.

[0017] Furthermore, the axis of the vertical moving contact and the axis of the horizontal moving contact are in an eccentric perpendicular relationship;

[0018] The drive shaft consists of three disconnected drive rods;

[0019] The gear transmission device includes a connecting rod, a first gear, a second gear, a first rack and a second rack; the first rack is arranged in a vertical direction, the second rack is arranged in a horizontal direction, and the first rack and the second rack are staggered; the first gear and the second gear are arranged on the connecting rod, the first gear is meshed with the first rack, and the second gear is meshed with the second rack;

[0020] The connecting rod and the transmission rod are staggered and connected, and the diameter of the connecting rod is smaller than that of the transmission rod;

[0021] The vertical moving contact is provided with an elongated hole for the connecting rod to pass through along its axial direction. The first rack is arranged on the inner wall of the vertical moving contact and is parallel to the elongated hole. The second rack is arranged on the outer surface of the horizontal moving contact.

[0022] Furthermore, the diameters of the two ends of the connecting rod are larger than the diameter of the middle section, and the two ends of the connecting rod are connected to the transmission rod by a key.

[0023] Furthermore, a first insulating partition is provided at the upper support tube, and a second insulating partition is provided at the rear support tube;

[0024] The vertical isolating static contact device is fixed on the first insulating partition, and the horizontal isolating static contact device is fixed on the second insulating partition.

[0025] Furthermore, the end of the transmission shaft is connected to the driving mechanism through a spline shaft.

[0026] Furthermore, the main tube is connected to the horizontal support tube and the vertical support tube by welding.

[0027] Furthermore, the vertical moving contact and the horizontal moving contact are electrically connected to the moving contact support seat through spring contacts.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention discloses a three-phase common box type three-position isolating and grounding switch, which comprises a shell and a driving device arranged on the outside of the shell, and three groups of isolating and grounding devices and a three-phase linkage device are arranged inside the shell; the three-phase linkage device connects the isolating and grounding devices inside the shell with the driving device, and the driving device drives the isolating and grounding devices to operate by driving the three-phase linkage device, thereby realizing double isolation synchronous opening, synchronous closing and grounding closing. The isolation opening state of the isolation and grounding device is also the grounding opening state. Therefore, after the isolation opening, the grounding position can be closed, and the isolation closing can only be performed after the grounding opening, thereby realizing the isolation and grounding three-position function. Each isolation and grounding device consists of two perpendicular isolation breaks and one grounding break, one of which is arranged horizontally with the grounding break. The dual isolation and grounding devices share a common drive unit, effectively reducing the number of drive units and minimizing the spacing between them. The vertical and horizontal moving contacts utilize an eccentric vertical structure, which facilitates the transmission structure layout of the vertical and horizontal moving contacts. This ensures that the gear and rack meshing positions are both located at the center of the moving contacts when the isolation and grounding devices are in the open state, resulting in a more compact dual-contact structure, smaller footprint, and higher overall economic efficiency. Based on an optimized internal structure, the outer shell is designed as an axial main tube, with the drive mechanism located at a port on one side of the main tube. Three pairs of mutually perpendicular horizontal and vertical branches are designed on the main tube. Under normal operation, all three phases flow simultaneously, allowing interphase heat to be convected through the main tube, resulting in high interphase heat convection efficiency. Furthermore, each phase's conductive circuit dissipates heat through the main tube, horizontal branches, and vertical branches, respectively. This large heat dissipation area significantly improves heat dissipation efficiency, thereby enhancing switch operation reliability.

[0030] Furthermore, the vertical moving contact and the horizontal moving contact are arranged vertically and coplanarly, and the vertical moving contact is installed at the end of the first rack. The vertical moving contact does not need to be slotted, and the overall processing technology of the vertical moving contact is simpler. While ensuring a certain current capacity, the diameter of the moving contact conductor is smaller, which can save the cost of the moving contact.

[0031] Furthermore, the vertical moving contact and the horizontal moving contact adopt an eccentric vertical structure, dividing the transmission shaft into three sections, and the diameter of the connecting rod is smaller than that of the transmission rod, in order to ensure that the transmission shaft can pass through the vertical moving contact while ensuring the flow capacity of the vertical moving contact.

[0032] Furthermore, the vertical moving contact and the horizontal moving contact are electrically connected to the moving contact support seat through the spring contact, ensuring that the main circuit is conductive after the double isolation switch is closed. After the isolation switch is grounded and closed, the vertical moving contact and the horizontal moving contact are grounded at the same time to ensure that the internal conductors are at the same potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the housing structure of a three-phase common box type three-station isolating and grounding switch of the present invention;

[0034] Figure 2 The first structure of the three-phase common box type three-station isolating grounding switch of the present invention corresponds to Figure 1 Schematic diagram of the top view of the structure (three-position isolating and grounding switch in the open position);

[0035] Figure 3 for Figure 2 Schematic diagram of the structure of the isolation grounding device;

[0036] Figure 4 for Figure 3 Schematic diagram of the corresponding three-dimensional structure;

[0037] Figure 5 The second structure of the three-phase common box type three-station isolating grounding switch of the present invention corresponds to Figure 1 Schematic diagram of the top view of the structure (three-position isolating and grounding switch in the open position);

[0038] Figure 6 for Figure 5 Schematic diagram of the structure of the isolation grounding device;

[0039] Figure 7 for Figure 6 Schematic diagram of the corresponding three-dimensional structure;

[0040] Figure 8 Schematic diagram of the connection structure of the three-phase linkage device in Example 2.

[0041] Among them: 1 is the first insulating partition; 2 is the vertical isolating static contact; 3 is the vertical moving contact; 4 is the moving contact support seat; 5 is the grounding static contact; 6 is the horizontal moving contact; 7 is the support cylinder; 8 is the horizontal isolating static contact; 9 is the second insulating partition; 10 is the three-phase linkage device; 11 is the housing; 12 is the drive mechanism, 13 is the isolation grounding device, 14 is the transmission shaft, 15 is the gear transmission device, and 16 is the spline shaft;

[0042] 111 is the main tube, 112 is the upper support tube, 113 is the lower support tube, 114 is the front support tube, and 115 is the rear support tube;

[0043] 151 is the second gear, 152 is the first gear, 153 is the first rack, 154 is the second rack, and 155 is the connecting rod. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0045] The components described and illustrated in the drawings and embodiments of the present invention may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but is merely an illustration of a selected embodiment of the present invention. All other embodiments derived by those skilled in the art based on the drawings and embodiments of the present invention without inventive step shall fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, element, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or devices shown to have such a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0048] like Figure 1 or Figure 2 As shown, the present invention discloses a three-phase common box type three-position isolating and grounding switch, including a housing 11 and a driving device arranged outside the housing 11, three groups of isolating and grounding devices 13 and a three-phase linkage device 10 are arranged in the housing 11; the three groups of isolating and grounding devices 13 are connected through the three-phase linkage device 10; each group of isolating and grounding devices 13 is integrated with two mutually perpendicular isolating fractures and one grounding fracture.

[0049] The shell 11 of the three-phase common box type three-position isolating and earthing switch consists of a main tube 111 and a branch tube. Two interfaces are provided at both ends of the axial direction of the main tube 111, and horizontal and vertical branch tubes and interfaces are provided in the radial direction of the main tube 111. Three phase axial branch tubes and interfaces are provided in the horizontal direction and vertical direction respectively, and each phase axial branch tube and interface are distributed in a line with equal distances along the axis of the main tube 111.

[0050] Under normal operating conditions, the three phases flow simultaneously, so the heat between the phases can be convected through the main tube 111, and the interphase heat convection efficiency is high; at the same time, each phase conductive circuit can dissipate heat through the main tube 111, horizontal and vertical branch tubes respectively, with a large heat dissipation area, greatly improving the heat dissipation efficiency, thereby improving the reliability of the switch operation.

[0051] The three-phase switches are equidistantly distributed along the axial direction of the main tube 111. Each phase can be assembled or repaired through the flange interfaces at both ends of the main tube 111. The dimensions of the flange interfaces at both ends of the main tube 111 are consistent with those of the main tube 111. The operating space is large, which is convenient for assembly and maintenance, greatly improving the efficiency of switch assembly and maintenance.

[0052] The three-phase common box type switch housing 11 provided by the present invention is formed by welding. Compared with the three-phase common box type switch housing 11 with the same air chamber pressure, the failure test pressure of the cast housing 11 is greater than the failure test pressure of the welded housing 11. In order to ensure the safety and reliability of the switch housing 11 during operation, the cast housing 11 is thicker than the welded housing 11. The three-phase common box type switch housing 11 provided by the present invention is lighter in weight, thereby improving the overall economy of the switch.

[0053] like Figure 1 As shown, the vertical support tube includes an upper support tube 112 located on the upper side of the main tube 111 and a lower support tube 113 located on the lower side of the main tube 111; the horizontal support tube includes a rear support tube 115 located on the rear side of the main tube 111 and a front support tube 114 located on the front side of the main tube 111.

[0054] like Figure 3-4 and Figure 6-7 As shown, the isolation grounding device 13 includes three groups of double-isolation three-station isolation grounding devices 13, and each group of double-isolation three-station isolation grounding devices 13 includes a vertical isolation static contact 2, a horizontal isolation static contact 8, a first insulating partition 1, a second insulating partition 9, a vertical moving contact 3, a horizontal moving contact 6, a moving contact support seat 4, a grounding static contact 5 and a support tube 7; the first insulating partition 1 is fixed to the upper support tube 112 in the vertical direction of the shell 11, and the second insulating partition 9 is fixed to the rear support tube 115 in the horizontal direction of the shell 11; the vertical isolation static contact 2 is fixed on the first insulating partition 1, and the water The flat isolating static contact 8 is fixed on the second insulating partition 9, the moving contact support seat 4 is placed in the middle of the horizontal and vertical support tubes of the outer shell 11, and each moving contact support seat 4 is respectively installed with a pair of mutually perpendicular vertical moving contacts 3 and horizontal moving contacts 6. The vertical moving contact 3 and the vertical isolating static contact 2 are coaxially opposite to each other, and the horizontal moving contact 6 and the horizontal isolating static contact 8 are coaxially opposite to each other. The grounding static contact 5 is located at the front interface in the horizontal direction of the outer shell 11 and is coaxially opposite to the horizontal moving contact 6. The support tube 7 is located at the lower interface in the vertical direction of the outer shell 11, and the axis of the support tube 7 is collinear with the axis of the vertical moving contact 3.

[0055] Figure 2 or Figure 5The driving device shown is located at an axial interface of the main cylinder 111 and is connected to the isolation grounding device 13 through a three-phase linkage device 10. The driving device drives the spline shaft 16 in the three-phase linkage device 10 to rotate, and the spline shaft 16 drives the transmission shaft 14 to rotate. The rotation of the transmission shaft 14 drives the gear transmission device 15 to rotate. The gear transmission device 15 drives the vertical moving contact 3 and the horizontal moving contact 6 in the isolation grounding device 13 to reciprocate along their axis, thereby realizing the isolation synchronous opening, synchronous closing or grounding closing of the three-phase isolation grounding device 13.

[0056] Figure 3 or Figure 6 The vertical moving contact 3 and the horizontal moving contact 6 in the isolation grounding device 13 shown are arranged vertically in the moving contact support base 4, and are connected to each other through the moving contact support base 4. The vertical moving contact 3 and the horizontal moving contact 6 are respectively provided with a rack structure along their axial direction. The racks of the two moving contacts are perpendicular to each other and mesh with the same gear transmission device 15. When the gear transmission device 15 rotates, the two moving contacts are driven to move synchronously, thereby ensuring that the two perpendicular moving contacts are respectively in contact or separated at the same time with the corresponding isolation static contacts, thereby realizing the double isolation of the isolation grounding device 13 and the synchronous reciprocating motion along its axial direction.

[0057] The vertical moving contact 3 and the horizontal moving contact 6 can be arranged vertically and coplanarly, or they can be arranged eccentrically and vertically. The following are two specific structures and their working principles.

[0058] The first structure:

[0059] like Figure 6 As shown, a cross bar is provided on the top of the first rack 153 , and the vertical moving contact 3 is fixed on the cross bar. The vertical moving contact 3 and the horizontal moving contact 6 are arranged vertically and coplanarly.

[0060] like Figure 2 and Figure 8 As shown, the three-phase linkage device 10 includes a spline shaft 16, a transmission shaft 14, and three sets of gear transmission devices 15, wherein the gear transmission device 15 is placed inside the moving contact support seat 4, and the three sets of moving contacts are connected through the transmission shaft 14; the gear transmission device 15 drives the three-phase moving contacts to move, thereby realizing the simultaneous closing, opening and grounding closing operations of the three-phase isolation grounding device 13, and ensuring the synchronization of the operation of the three-phase isolation grounding device 13.

[0061] like Figure 3As shown, when the three-position isolating grounding switch with double isolating breaks is in the isolating closed state, the vertical moving contact 3 and the vertical isolating static contact 2 are in the closed state, the horizontal moving contact 6 and the horizontal isolating static contact 8 are in the closed state, and the horizontal moving contact 6 and the grounding static contact 5 are in the open state. Upon receiving the isolation opening command, the drive mechanism 12 drives the transmission rod to rotate counterclockwise, driving the first gear 152 and the second gear 151 to rotate counterclockwise, driving the vertical moving contact 3 and the horizontal moving contact 6 to rotate with the gear transmission device 15 while moving synchronously away from the vertical isolating static contact 2 and the horizontal isolating static contact 8, realizing the double isolation synchronous opening operation. After the vertical moving contact 3 and the horizontal moving contact 6 are in the open position, the drive mechanism 12 stops driving.

[0062] The vertical moving contact 3 and the horizontal moving contact 6 are in the isolation and grounding equalization state. When the grounding closing command is received, the driving mechanism 12 drives the transmission rod to rotate counterclockwise, and the vertical moving contact 3 continues to move away from the vertical isolation static contact 2. At the same time, the horizontal moving contact 6 continues to move synchronously away from the horizontal isolation static contact 8. The vertical moving contact 3 moves toward the support tube 7, and the horizontal moving contact 6 moves toward the grounding static contact 5 device, thereby realizing grounding closing, and the driving mechanism 12 stops driving.

[0063] The second structure:

[0064] like Figure 5 and 6 As shown, the axis of the vertical moving contact 3 and the axis of the horizontal moving contact 6 are in an eccentric perpendicular relationship.

[0065] Under this structure, if Figure 8 As shown, the transmission shaft 14 is designed as three disconnected transmission rods; the gear transmission device 15 includes a connecting rod 155, a first gear 152, a second gear 151, a first rack 153 and a second rack 154; the first rack 153 is arranged in the vertical direction, the second rack 154 is arranged in the horizontal direction, and the first rack 153 and the second rack 154 are staggered; the first gear 152 and the second gear 151 are arranged on the connecting rod 155, the first gear 152 is engaged with the first rack 153, and the second gear 151 is engaged with the second rack 154; the connecting rod 155 is staggered with the transmission rod.

[0066] The vertical moving contact 3 is provided with a long hole along its axial direction for the connecting rod 155 to pass through. The first rack 153 is arranged on the inner wall of the vertical moving contact 3, and the first rack 153 is parallel to the direction of the long hole. The second rack 154 is arranged on the outer surface of the horizontal moving contact 6.

[0067] The transmission shaft 14 is divided into three sections, and the diameter of the connecting rod 155 is smaller than that of the transmission rod, in order to ensure that the transmission shaft 14 can pass through the vertical moving contact 3 while ensuring the flow capacity of the vertical moving contact 3 device.

[0068] The split structure of the transmission shaft 14 adopted in the second structure is of course also applicable to the first structure of the isolation grounding device 13 .

[0069] like Figure 6 As shown, the vertical moving contact 3 and the horizontal moving contact 6 are in the isolation and grounding equalizing switch state. When the isolation closing command is received, the driving mechanism 12 drives the transmission rod to rotate clockwise, driving the first gear 152 and the second gear 151 to rotate. The first gear 152 drives the vertical moving contact 3 to move toward the vertical isolation static contact 2. At the same time, the second gear 151 drives the horizontal moving contact 6 to move synchronously toward the horizontal isolation static contact 8, realizing the double isolation synchronous closing operation, and the driving mechanism 12 stops driving.

[0070] When the three-position isolating grounding switch with double isolation fractures is in the isolation closing state, upon receiving the isolation opening command, the driving mechanism 12 drives the transmission rod to rotate counterclockwise, driving the first gear 152 and the second gear 151 to rotate, and the first gear 152 drives the vertical moving contact 3 to move away from the vertical isolation static contact 2. At the same time, the second gear 151 drives the horizontal moving contact 6 to move synchronously away from the horizontal isolation static contact 8, realizing the double isolation synchronous opening operation. After the vertical moving contact 3 and the horizontal moving contact 6 are opened, the driving mechanism 12 stops driving.

[0071] The vertical moving contact 3 and the horizontal moving contact 6 are in the isolation and grounding equalization state. When the grounding closing command is received, the driving mechanism 12 drives the gear transmission device 15 to rotate counterclockwise, and the vertical moving contact 3 moves away from the vertical isolation static contact 2. At the same time, the horizontal moving contact 6 continues to move synchronously away from the horizontal isolation static contact 8. The vertical moving contact 3 moves toward the support tube 7, and the horizontal moving contact 6 moves toward the grounding static contact 5 device, thereby realizing grounding closing, and the driving mechanism 12 stops driving.

[0072] Figure 4 or Figure 7 The horizontal moving contact 6 of the isolation grounding device 13 shown is both an isolation moving contact and a grounding moving contact. Therefore, the isolation grounding device 13 realizes the mechanical interlocking of the isolation and grounding breaks through the same moving contact. When the isolation grounding device 13 is grounded and in the opening condition, it is also in the isolation opening condition, and the isolation closing can be performed. When the isolation is in the opening condition, the grounding place can be closed, thereby realizing the three-position functions of isolation closing, isolation grounding opening and grounding closing; at the same time, because the vertical moving contact 3 and the horizontal moving contact 6 are engaged with the same gear transmission device 15, the vertical moving contact 3 and the horizontal moving contact 6 reciprocate synchronously, and the vertical moving contact 3 and the horizontal moving contact 6 are connected to each other through the moving contact support seat 4, thereby realizing the synchronous opening, closing and grounding closing of the two moving contacts.

Claims

1. A three-phase common box type three-position isolating grounding switch, characterized in that: It comprises a housing (11) and a driving device arranged outside the housing (11); three sets of isolation grounding devices (13) and a three-phase linkage device (10) are arranged inside the housing (11); the three sets of isolation grounding devices (13) are connected via the three-phase linkage device (10); The housing (11) includes a main cylinder (111), three pairs of mutually perpendicular horizontal support cylinders and vertical support cylinders are provided on the main cylinder (111), two interfaces are provided along the axial direction of the main cylinder (111), and the driving device is installed at one of the interfaces; the vertical support cylinder includes an upper support cylinder (112) located on the upper side of the main cylinder (111) and a lower support cylinder (113) located on the lower side of the main cylinder (111); the horizontal support cylinder includes a rear support cylinder (115) located on the rear side of the main cylinder (111) and a front support cylinder (114) located on the front side of the main cylinder (111); Each set of isolation grounding devices (13) comprises a vertical isolation static contact (2), a vertical moving contact (3), a moving contact support seat (4), a horizontal isolation static contact (8), a horizontal moving contact (6), a grounding static contact (5) and a support tube (7); the moving contact support seat (4) is fixed on the support tube (7); the vertical moving contact (3) and the horizontal moving contact (6) are vertically arranged in the moving contact support seat (4), and the vertical moving contact (3) is located between the vertical isolation static contact (2) and the support tube (7); the horizontal moving contact (6) is located between the horizontal isolation static contact (8) and the grounding static contact (5); The vertical isolating static contact (2) is arranged in the upper support tube (112), the support tube (7) is arranged in the lower support tube (113), the horizontal isolating static contact (8) is arranged in the rear support tube (115), and the grounding static contact (5) is arranged in the front support tube (114); The three-phase linkage device (10) includes a transmission shaft (14) and three gear transmission devices (15), wherein the gear transmission devices (15) are arranged on the transmission shaft (14), and each gear transmission device (15) is correspondingly arranged in a movable contact support seat (4) for simultaneously driving the vertical movable contact (3) and the horizontal movable contact (6) to reciprocate linearly; When the vertical moving contact (3) and the horizontal moving contact (6) are arranged vertically and coplanarly, the gear transmission device (15) includes a first gear (152), a second gear (151), a first rack (153) and a second rack (154); the first rack (153) is arranged in a vertical direction, the second rack (154) is arranged in a horizontal direction, and the first rack (153) and the second rack (154) are staggered. The first gear (152) and the second gear (151) are arranged on the transmission shaft (14), the first gear (152) is meshed with the first rack (153), the second gear (151) is meshed with the second rack (154), the vertical moving contact (3) is fixedly connected to the top of the first rack (153), and the second rack (154) is arranged on the outer surface of the horizontal moving contact (6); When the axis of the vertical moving contact (3) and the axis of the horizontal moving contact (6) are in an eccentric vertical relationship, the transmission shaft (14) includes three transmission rods; the gear transmission device (15) includes a connecting rod (155), a first gear (152), a second gear (151), a first rack (153) and a second rack (154); the first rack (153) is arranged in a vertical direction, the second rack (154) is arranged in a horizontal direction, and the first rack (153) and the second rack (154) are staggered; the first gear (152) and the second gear (151) are arranged on the connecting rod (155), the first gear (152) is meshed with the first rack (153), and the second gear (151) is meshed with the second rack (154); The connecting rod (155) is staggeredly connected to the transmission rod, and the diameter of the connecting rod (155) is smaller than that of the transmission rod; The vertical moving contact (3) is provided with a long hole for the connecting rod (155) to pass through along its axial direction. The first rack (153) is arranged on the inner wall of the vertical moving contact (3), and the first rack (153) is parallel to the long hole. The second rack (154) is arranged on the outer surface of the horizontal moving contact (6).

2. A three-phase common box type three-station isolating and grounding switch according to claim 1, characterized in that: The horizontal support tubes are distributed in a straight line at equal distances along the axis of the main tube (111), and the vertical support tubes are distributed in a straight line at equal distances along the axis of the main tube (111).

3. The three-phase common box type three-station isolating and grounding switch according to claim 1, characterized in that: A crossbar is provided at the top end of the first rack (153), and the vertical moving contact (3) is fixed on the crossbar. The vertical moving contact (3) and the horizontal moving contact (6) are arranged vertically and coplanarly.

4. The three-phase common box type three-station isolating and grounding switch according to claim 1, characterized in that: The diameters of both ends of the connecting rod (155) are larger than the diameter of the middle section, and both ends of the connecting rod (155) are connected to the transmission rod by a key or a gear.

5. The three-phase common box type three-position isolating and grounding switch according to claim 1, characterized in that: The end of the transmission shaft (14) is connected to the driving mechanism (12) via a spline shaft (16).

6. The three-phase common box type three-station isolating and grounding switch according to claim 1, characterized in that: A first insulating partition (1) is provided at the upper support tube (112), and a second insulating partition (9) is provided at the rear support tube (115); The vertical isolating static contact (2) device is fixed on the first insulating partition (1), and the horizontal isolating static contact (8) device is fixed on the second insulating partition (9).

7. The three-phase common box type three-station isolating and grounding switch according to claim 1, characterized in that: The main tube (111) is connected to the horizontal support tube and the vertical support tube by welding.

8. The three-phase common box type three-position isolating and grounding switch according to claim 1, characterized in that: The vertical moving contact (3) and the horizontal moving contact (6) are electrically connected to the moving contact support seat (4) via spring contacts.

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