A double-isolated air-insulated switchgear

Abstract

The application discloses a kind of upper and lower isolation air insulation switch cabinet, including circuit breaker, upper isolating switch located above circuit breaker, lower isolating switch located below circuit breaker, upper isolating switch includes upper control shaft, fixed contact seat, cam and movable contact, cam is fixedly connected with upper control shaft, cam is used to push movable contact to realize the contact or disconnection between movable contact and fixed contact seat, upper control shaft includes outer cylinder, inner cylinder and inner rod arranged from inside to outside and coaxially arranged, the switch cabinet in the application is used to isolate circuit breaker up and down, realize the effective isolation of circuit breaker, improve the safety performance of electric power;At the same time, isolating switch can isolate all circuit breakers through inner cylinder, and can also isolate and control three circuit breakers respectively through inner rod, can isolate and control circuit breakers respectively according to different working conditions, compact structure, practical function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, and in particular to an upper and lower double-isolation air-insulated switch cabinet. BACKGROUND

[0002] The air-insulated switch cabinet is a kind of power equipment using dry and clean air as the main insulating medium. The components in the switch cabinet mainly include circuit breakers, disconnectors, operating mechanisms, transformers, and various protection devices. The disconnectors are generally connected in series with the circuit breakers and used for isolating the power supply of the main circuit. Generally, the three-phase disconnectors are arranged in parallel, and the same isolation shaft is used to control the simultaneous breaking of the three disconnectors. This will result in that one disconnector controls three-phase circuit breakers at the same time, and one phase of the circuit breaker fails to form an isolated circuit, and the disconnector will also disconnect the other circuit breakers that have not failed, affecting the operation of the other two-phase power grids. SUMMARY

[0003] The purpose of the present application is to solve the problem of simultaneous breaking of three-phase circuit breakers controlled by one isolation shaft in the existing switch cabinet, and to provide an upper and lower double-isolation air-insulated switch cabinet. The switch cabinet can realize the breaking of three-phase circuit breakers individually or simultaneously by one isolation shaft, and improve the working condition applicability.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The upper and lower double-isolation air-insulated switch cabinet comprises a circuit breaker, an upper disconnector located above the circuit breaker, a lower disconnector located below the circuit breaker, an upper isolation control assembly for controlling the opening and closing of the upper disconnector, a lower isolation control assembly for controlling the opening and closing of the lower disconnector, and a circuit breaker control mechanism. The upper disconnector comprises an upper control shaft, a fixed contact seat, a cam, and a movable contact. The cam is fixedly connected to the upper control shaft, and the cam is used to push the movable contact to realize the contact or disconnection between the movable contact and the fixed contact seat.

[0006] The upper control shaft comprises an outer cylinder, an inner cylinder, and an inner rod arranged coaxially from inside to outside. The outer cylinder comprises a first rotating shaft, a second rotating shaft, and a third rotating shaft corresponding to three phases and rotatably connected to each other. Three cams are fixedly sleeved on the first rotating shaft, the second rotating shaft, and the third rotating shaft, respectively. The inner cylinder penetrates the outer cylinder, and the inner rod penetrates the inner cylinder.

[0007] A control cavity is arranged inside the outer cylinder. A spline sleeve and a matching sleeve are arranged on the inner wall of the control cavity. The inner cylinder is fixedly arranged with spline protrusions matched with the spline sleeve and a sliding groove. A sliding block matched with the sliding groove is fixedly arranged on the inner rod. An independent control block matched with the matching sleeve is slidably sleeved on the inner rod. The sliding block is connected to the independent control block through a control elastic element.

[0008] The upper isolation control assembly comprises a brake block for braking the inner cylinder, a switch handle for rotating the inner cylinder, and a selection handle for controlling axial movement and rotation of the inner rod.

[0009] The upper and lower isolation air-insulated switch cabinet has the advantages that the upper and lower isolation air-insulated switch cabinet is used for upper isolation and lower circuit breaker, effectively isolates the circuit breaker, and improves the safety performance of electric power. Meanwhile, the isolation switch can isolate all circuit breakers through the inner cylinder, and can isolate three circuit breakers through the inner rod, respectively, and can control the circuit breakers to be isolated, respectively, according to different working conditions, has a compact structure, and is practical in function. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 is a structural schematic diagram of the upper and lower isolation air-insulated switch cabinet.

[0011] Figure 2 FIG. 2 is a structural schematic diagram of the upper control shaft of the switch cabinet.

[0012] Figure 3 FIG. 3 is a structural schematic diagram of the two control shafts of the switch cabinet.

[0013] Figure 4 FIG. 4 is a structural schematic diagram of the outer cylinder control cavity of the upper control shaft of the switch cabinet.

[0014] Figure 5 FIG. 5 is a structural schematic diagram of the radial surface of the upper control shaft of the switch cabinet.

[0015] Figure 6 FIG. 6 is a structural schematic diagram of the control shaft A of the switch cabinet.

[0016] Figure 7 FIG. 7 is a structural schematic diagram of the sliding sleeve of the switch cabinet.

[0017] Figure 8 FIG. 8 is a structural schematic diagram of the independent control block arrangement of the switch cabinet.

[0018] Figure 9 FIG. 9 is a structural schematic diagram of the upper isolation switch of the switch cabinet.

[0019] In the figure, 1 is a circuit breaker, 2 is an upper isolation switch, 3 is a lower isolation switch, 4 is a circuit breaker control mechanism, 5 is an upper isolation control assembly, 6 is a lower isolation control assembly, 7 is an upper control shaft, 8 is a lower control shaft, 9 is a fixed contact seat, 10 is a cam, 11 is a movable contact, 12 is a synchronous belt, and 13 is a synchronous rod.

[0020] 71 is an outer cylinder, 72 is an inner cylinder, 73 is an inner rod, 74 is an independent control block, 75 is a spline sleeve, 76 is a matching sleeve, 77 is a sliding block, 78 is a control elastic member, and 79 is a sliding groove.

[0021] 721, spline protrusion; 701, first rotating shaft; 702, second rotating shaft; 703, third rotating shaft;

[0022] 51, brake block; 52, switch handle; 53, selection handle; 54, sliding sleeve; 55, displacement block; 56, indicator needle; 57, limiting seat; 58, isolation elastic member; 551, selection mark;

[0023] 91, fixing seat; 92, first contact block; 93, second contact block; 94, extension plate; 95, communication elastic member; 921, first contact; 922, first elastic member; 931, second contact; 932, second elastic member; 111, arc striking plate; 112, communication plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0025] Referring to Figure 1 A double-isolation air-insulated switch cabinet is provided, which comprises a main box body, three circuit breakers 1 for controlling three-phase circuits, an upper isolation switch 2 arranged above each circuit breaker 1, a lower isolation switch 3 arranged below each circuit breaker 1, and an isolation control assembly 5 for controlling the opening and closing of the upper isolation switch 2, an isolation control assembly 6 for controlling the opening and closing of the lower isolation switch 3, and a circuit breaker control mechanism 4 arranged in a control box body on one side of the main box body.

[0026] Referring to Figure 2 The upper isolation switch 2 comprises an upper control shaft 7, a fixed contact seat 9, a cam 10 and a movable contact 11. The cam 10 is fixedly connected to the upper control shaft 7, the upper control shaft 7 is rotatably connected to the switch cabinet, and the upper control shaft 7 drives the cam 10 to rotate, and the cam 10 is used to push the movable contact 11 to realize the contact or disconnection between the movable contact 11 and the fixed contact seat 9, thereby realizing the conduction and disconnection of the upper isolation switch.

[0027] Referring to Figure 3 , Figure 4 and Figure 5 The upper control shaft 7 comprises an outer cylinder 71, an inner cylinder 72 and an inner rod 73 arranged coaxially from inside to outside. The inner cylinder 72 penetrates the outer cylinder 71 and extends from one end of the outer cylinder 71, and the extending end of the inner cylinder 72 is located in the control box body. The inner rod 73 penetrates the inner cylinder 72 and extends from one end of the inner cylinder 72, and the extending end of the inner rod 73 is located in the control box body. The outer cylinder 71, the inner cylinder 72 and the inner rod 73 are rotatably connected.

[0028] The outer cylinder 71 comprises a first rotating shaft 701, a second rotating shaft 702 and a third rotating shaft 703 which are connected with each other in rotation, and the cam 10 is arranged on each of the first rotating shaft 701, the second rotating shaft 702 and the third rotating shaft 703, and the position of the cam 10 corresponds to the position of the three-phase corresponding disconnector.

[0029] Further, the control cavity is arranged inside the outer cylinder 71, the inner wall of the control cavity is provided with the spline sleeve 75 and the matching sleeve 76, the inner cylinder 72 is fixedly arranged in the control cavity and provided with the spline protrusion 721 matched with the spline sleeve 75, and when the spline protrusion 721 of the inner cylinder 72 is located inside the spline sleeve 75, the inner cylinder 72 can drive the outer cylinder 71 to rotate.

[0030] In addition, the inner cylinder 72 is further provided with the sliding groove 79 in the control cavity of the outer cylinder 71, the sliding block 77 matched with the sliding groove 79 is fixedly arranged on the inner rod 73, the independent control block 74 matched with the matching sleeve 76 is slidingly sleeved on the inner rod 73, and the sliding block 77 is connected with the independent control block 74 through the control elastic element 78. When the spline sleeve 75 is matched with the spline protrusion 721 of the inner cylinder 72, the control elastic element 78 is used to support the independent control block 74 away from the matching sleeve 76, and when the inner cylinder 72 moves axially, the control elastic element 78 can be used to pull the independent control block 74 into the matching sleeve 76.

[0031] In the embodiment, the inner rod 73 drives the independent control block 74 to cooperate with the matching sleeve 76 through axial movement. When one independent control block 74 of the inner rod 73 is located inside the corresponding matching sleeve 76, the inner rod 73 can independently control the corresponding rotating shaft of the matching sleeve 76.

[0032] Reference Figure 5 and Figure 8 The corresponding independent control block 74 and the matching sleeve 76 inside the control cavity of the first rotating shaft 701, the second rotating shaft 702 and the third rotating shaft 703 are square in shape, but the arrangement angles of the independent control blocks 74 are different, and the independent control block 74 inside the control cavity of the first rotating shaft 701, the second rotating shaft 702 and the third rotating shaft 703 needs to be rotated to the corresponding angle to enter the inside of the corresponding matching sleeve 76 to realize matching.

[0033] Reference Figure 6 The upper isolation control assembly 5 comprises the brake block 51 for braking the inner cylinder 72, the switch handle 52 for rotating the inner cylinder 72 and the selection handle 53 for controlling the axial movement and rotation of the inner rod 73.

[0034] The switch handle 52 is fixedly connected with the inner cylinder 72, and the rotation of the inner cylinder 72 can be realized by actuating the switch handle 52. The brake block 51 is installed on one side of the inner cylinder 72, and the brake block 51 is in contact with or separated from the inner cylinder 72 through the driving element to realize the braking and movement of the inner cylinder 72.

[0035] The selection handle 53 is fixedly connected to the end of the inner rod 73 extending from the inner cylinder 72, and rotating the selection handle 53 can realize the rotation of the inner rod 73, and axially pushing the selection handle 53 can realize the axial movement of the inner rod 73.

[0036] Reference Figure 6 The part of the inner rod 73 extending from the inner cylinder 72 is provided with the indicating needle 56 and the displacement block 55, the indicating needle 56 is fixedly connected to the inner rod 73, the displacement block 55 is axially non-sliding and rotationally connected to the inner rod 73, the displacement block 55 is provided with selection marks 551 matched with the phases, the inner rod 73 is rotated to make the indicating needle 56 point to the corresponding selection mark 551, for adjusting the angle of the independent control block 74 on the inner rod 73, so that the angle of one of the independent control blocks 74 matches the matching sleeve 76, and then the inner rod 73 is axially pushed to make the independent control block 74 enter the inside of the corresponding matching sleeve 76, to complete the matching of one of the independent control blocks 74 and the corresponding matching sleeve 76, and realize the independent control of the inner rod 73 on the first rotating shaft 701, the second rotating shaft 702 or the third rotating shaft 703.

[0037] Further, the inner rod 73 is externally provided with a sliding sleeve 54 matched with the displacement block 55, the sliding sleeve 54 is used to limit the rotation of the displacement block 55. The cabinet is provided with a limiting seat 57 on the side of the displacement block 55 close to the upper isolation switch 2, a separation elastic element 58 is arranged between the limiting seat 57 and the displacement block 55, the separation elastic element 58 is used to separate the limiting seat 57 and the displacement block 55, so that the inner rod 73 is located at the initial position. When the inner rod 73 is located at the initial position, the spline sleeve 75 matches the spline protrusion 721 of the inner cylinder 72. The switch handle 52 can control the rotation of the entire outer cylinder 71 through the inner cylinder 72.

[0038] In the embodiment, the control state of the control shaft 7 of the upper and lower double-isolation air insulation switch cabinet has the following two kinds:

[0039] (I) Inner cylinder control state. In this state, the separation elastic element 58 is in an extended state, the inner rod 73 is located at the initial position, the spline sleeve 75 of the first rotating shaft control cavity 701, the second rotating shaft control cavity 702 and the third rotating shaft control cavity 703 respectively matches the spline protrusion 721 of the inner cylinder 72, the independent control block 74 is separated from the matching sleeve 76, the switch handle 52 can control the rotation of the entire outer cylinder 71 through the inner cylinder 72, and the simultaneous opening and closing of the three upper isolation switches 2 is realized.

[0040] (II) The inner rod control state is taken as an example to control the first rotating shaft 701. Before entering this state, the inner rod 73 needs to be pushed first, the slider 77 on the inner rod 73 pushes the inner cylinder 72 to move relative to the outer cylinder 73, so that the spline protrusion 721 of the inner cylinder 72 is separated from the spline sleeve 75 of the outer cylinder 73, then the inner rod 73 is rotated, the indicator needle 56 points to the selection mark 551 corresponding to the control of the first rotating shaft 701, so that the angle of the independent control block 74 in the control cavity of the first rotating shaft 701 matches the matching sleeve 76; then the inner rod 73 is continuously pushed, the slider 77 pulls the independent control block 74 through the control elastic element 78, so that the independent control block 74 in the control cavity of the first rotating shaft 701 enters the inside of the corresponding matching sleeve 76, the matching of the independent control block 74 and the corresponding matching sleeve 76 is completed, and the independent control of the inner rod 73 on the first rotating shaft 701 is realized.

[0041] Even if the slider 77 pulls the independent control blocks 74 of the second rotating shaft 702 and the third rotating shaft 703 through the corresponding control elastic elements 78, since the angles of the independent control blocks 74 in the control cavities of the second rotating shaft 702 and the third rotating shaft 703 do not match the matching sleeves 76, the independent control blocks 74 in the control cavities of the second rotating shaft 702 and the third rotating shaft 703 do not enter the inside of the matching sleeves 76, and only the stretching of the control elastic elements 78 exists.

[0042] It is worth noting that, in order to keep the spline sleeve 75 and the spline protrusion 721 of the inner cylinder 72 re-matched, the number of splines on the spline sleeve 75 in the embodiment is even. When the inner rod 73 and the inner cylinder 72 are controlled, the rotation angle of the inner rod 73 and the inner cylinder 72 in one switch is 180°, that is, the inner rod 73 and the inner cylinder 72 realize the opening and closing of the isolation switch through 180° rotation, which is used to keep the matching of the spline sleeve 75 and the spline protrusion 721 of the inner cylinder 72 after the rotation of the inner rod 73 and the inner cylinder 72. The angle between adjacent independent control blocks 74 is twice the corresponding central angle of the spline, which is used to keep the matching of the spline sleeve 75 and the spline protrusion 721 of the inner cylinder 72 after the rotation of the independent control block 74 matching the matching sleeve 76.

[0043] Embodiment 2

[0044] Reference Figure 3 Different from embodiment 1, the lower isolation switch 3 and the upper isolation switch 2 in the embodiment are the same in structure, and the lower control shaft 8 of the lower isolation switch 3 is the same in structure as the upper control shaft 7. The inner rod 73 of the upper control shaft 7 is connected with the inner rod of the lower control shaft 8 through the synchronous belt 12 and the synchronous rod 13. The synchronous belt 12 is used to realize the synchronous rotation of the inner rod 73 of the upper control shaft 7 and the inner rod of the lower control shaft 8, and the synchronous rod 13 is used to realize the synchronous axial movement of the inner rod 73 of the upper control shaft 7 and the inner rod of the lower control shaft 8, so as to realize the synchronous connection and disconnection of the upper control shaft 7 and the lower control shaft 8.

[0045] Embodiment 3

[0046] Unlike the embodiments 1 and 2, the reference Figure 9 In the embodiment, the fixed contact seat 9 of the upper and lower isolation air insulated switch cabinet comprises a fixed seat 91 and symmetrically arranged first and second contact blocks 92 and 93. The first contact block 92 is provided with a first contact 921 on one side and connected with the fixed seat 91 through a first elastic member 922 on the other side. The second contact block 93 is provided with a second contact 931 on one side and connected with the fixed seat 91 through a second elastic member 932 on the other side. The movable contact 11 is located between the first and second contact blocks 92 and 93 and is provided with a communication plate 111 for conducting the first and second contacts 921 and 931. When the two ends of the communication plate 111 of the movable contact 11 are in contact with the first and second contacts 921 and 931 respectively, the disconnector is in a conducting state.

[0047] One end of the movable contact 11 is provided with an extension plate 94 connected with the fixed seat 91 through a communication elastic member 95. The communication elastic member 95 is used to support the movable contact 11 so that the movable contact 11 is not located between the first and second contact blocks 92 and 93. The cam 10 is used to push the movable contact 11 into the first and second contact blocks 92 and 93 to realize the communication of the first and second contacts 921 and 931.

[0048] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A double-isolation air-insulated switchgear, comprising a circuit breaker (1), an upper isolation switch (2) located above the circuit breaker (1), a lower isolation switch (3) located below the circuit breaker (1), an upper isolation control assembly (5) for controlling the opening and closing of the upper isolation switch (2), a lower isolation control assembly (6) for controlling the opening and closing of the lower isolation switch (3), and a circuit breaker control mechanism (4), characterized in that, The upper isolation switch (2) comprises an upper control shaft (7), a fixed contact seat (9), a cam (10) and a movable contact (11), the cam (10) is fixedly connected with the upper control shaft (7), and the cam (10) is used for pushing the movable contact (11) to realize contact or disconnection between the movable contact (11) and the fixed contact seat (9); The upper control shaft (7) comprises an outer cylinder (71), an inner cylinder (72) and an inner rod (73) arranged coaxially from outside to inside, the outer cylinder (71) comprises a first rotating shaft (701), a second rotating shaft (702) and a third rotating shaft (703) corresponding to three phases and being rotatably connected with each other, and the three cams (10) are respectively fixedly sleeved on the first rotating shaft (701), the second rotating shaft (702) and the third rotating shaft (703); the inner cylinder (72) penetrates the outer cylinder (71), and the inner rod (73) penetrates the inner cylinder (72); A control cavity is arranged in the outer cylinder (71), a spline sleeve (75) and a matching sleeve (76) are arranged on the inner wall of the control cavity, the inner cylinder (72) is fixedly provided with spline protrusions (721) matched with the spline sleeve (75) and a sliding groove (79) in the control cavity; When the spline protrusions (721) of the inner cylinder (72) are located in the spline sleeve (75), the inner cylinder (72) drives the outer cylinder (71) to rotate; The inner rod (73) is fixedly provided with a sliding block (77) matched with the sliding groove (79), the inner rod (73) is slidably sleeved with an independent control block (74) matched with the matching sleeve (76), and the sliding block (77) is connected with the independent control block (74) through a control elastic element (78); when the spline sleeve (75) is matched with the spline protrusions (721) of the inner cylinder (72), the control elastic element (78) is used for supporting the independent control block (74) away from the matching sleeve (76); when the inner cylinder (72) moves axially, the control elastic element (78) is used for pulling the independent control block (74) into the matching sleeve (76); the inner rod (73) drives the independent control block (74) to cooperate with the matching sleeve (76) through axial movement; when one independent control block (74) of the inner rod (73) is located in the corresponding matching sleeve (76), the inner rod (73) is used for independently controlling the corresponding rotating shaft of the matching sleeve (76); The independent control block (74) and the matching sleeve (76) in the control cavity of the first rotating shaft (701), the second rotating shaft (702) and the third rotating shaft (703) are all square, the independent control blocks (74) of the first rotating shaft (701), the second rotating shaft (702) and the third rotating shaft (703) are arranged at different angles, and the independent control block (74) is rotated to the corresponding angle to realize matching with the matching sleeve (76); The upper isolation control assembly (5) comprises a brake block (51) used for braking the inner cylinder (72), a switch handle (52) used for rotating the inner cylinder (72) and a selection handle (53) used for controlling axial movement and rotation of the inner rod (73). The inner rod (73) is externally provided with a sliding sleeve (54) matched with the displacement block (55), the sliding sleeve (54) is used for limiting the rotation of the displacement block (55), the cabinet body is provided with a limiting seat (57) on the side of the displacement block (55) close to the upper disconnecting switch (2), a separation elastic element (58) is arranged between the limiting seat (57) and the displacement block (55), the separation elastic element (58) is used for separating the limiting seat (57) and the displacement block (55), so that the inner rod (73) is located at the initial position, when the inner rod (73) is located at the initial position, the spline sleeve (75) is matched with the spline protrusion (721) of the inner cylinder (72), the switch handle (52) controls the rotation of the entire outer cylinder (71) through the inner cylinder (72).

2. The double insulated air switchgear according to claim 1, wherein, The switch handle (52) is fixedly connected with the inner cylinder (72), and the brake block (51) is installed on one side of the inner cylinder (72).

3. The double insulated air switchgear according to claim 1, wherein, The selection handle (53) is fixedly connected with the end of the inner rod (73) extending out of the inner cylinder (72). The part of the inner rod (73) extending out of the inner cylinder (72) is provided with an indicating needle (56) and a displacement block (55), the indicating needle (56) is fixedly connected with the inner rod (73), the displacement block (55) is axially slidably and rotatably connected with the inner rod (73), the displacement block (55) is provided with selection marks (551) matched with phases, and the inner rod (73) is used for indicating the corresponding selection mark (551) pointed by the indicating needle (56) by rotating.

4. The double insulated air switchgear according to claim 1, 2 or 3, characterized in that, The lower disconnecting switch (3) and the upper disconnecting switch (2) are the same in structure, the lower control shaft (8) of the lower disconnecting switch (3) is the same in structure as the upper control shaft (7). The inner rod (73) of the upper control shaft (7) and the inner rod of the lower control shaft (8) are connected through a synchronous belt (12) and a synchronous rod (13).

5. The double insulated air switchgear according to claim 4, wherein, The fixed contact seat (9) comprises a fixed seat (91) and symmetrically arranged first and second contact blocks (92) and (93), one side of the first contact block (92) is provided with a first contact (921), the other side of the first contact block (92) is connected with the fixed seat (91) through a first elastic element (922), one side of the second contact block (93) is provided with a second contact (931), and the other side of the second contact block (93) is connected with the fixed seat (91) through a second elastic element (932). The movable contact (11) is located between the first and second contact blocks (92) and (93) and is connected with the fixed seat (91) through a communication elastic element (95). The movable contact (11) is provided with a communication plate (111) for conducting the first and second contacts (921) and (931).

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