CN113161917B

CN113161917B - Alternating current metal-enclosed switchgear

Info

Publication number: CN113161917B
Application number: CN202110329937.3A
Authority: CN
Inventors: 铁政; 陈益平; 张轩
Original assignee: Znint Electric Share Holding Co ltd
Current assignee: Znint Electric Share Holding Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2023-02-28
Anticipated expiration: 2041-03-29
Also published as: CN113161917A

Abstract

The invention discloses alternating current metal enclosed switchgear which comprises a cabinet body, a bus chamber, a load switch chamber, a fusing device, a grounding chamber, a circuit breaker and a cable chamber, wherein the bus chamber is arranged above the inside of the cabinet body, the load switch chamber is arranged below the bus chamber and used for being communicated with a cable and controlling power transmission of the cable, the fusing device is arranged below the load switch chamber and used for protecting a short circuit of a power distribution branch line in the equipment, the circuit breaker is arranged at the right end of the fusing device and used for cutting off and connecting a load circuit, the cable chamber is arranged below the fusing device, the grounding chamber is arranged in a cavity at the lower left corner of the cable chamber, and the grounding device is arranged in the grounding chamber.

Description

Alternating current metal-enclosed switchgear

Technical Field

The invention relates to the technical field of electrical switchgear, in particular to alternating current metal-enclosed switchgear.

Background

The switch cabinet is an electrical device, the exterior line of the switch cabinet firstly enters a main control switch in the cabinet and then enters a branch control switch, and each branch is arranged according to the requirement. The main function is to open and close, control and protect the electric equipment in the process of generating, transmitting, distributing and converting electric energy in the electric power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism and various protection devices. In the existing alternating current metal closed switch equipment, a switch control device is frequently used, and a switch closer is greatly abraded, so that a conductor cable is not firmly contacted, a loosening condition occurs, and a circuit fault is caused; and, when the switch is cut off, the voltage at the moment of cutting off is overlarge, a mass of gas which has extremely high temperature, emits strong light and can conduct electricity is easily generated in the contact gap, and sparks appear at the joint to cause circuit failure, even cause hazards such as fire and the like.

Accordingly, one skilled in the art provides an ac metal enclosed switchgear to solve the problems set forth in the above background art.

Disclosure of Invention

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an exchange metal enclosed switchgear, its includes the cabinet body, generating line room, load switch room, fusing device, earthing room, circuit breaker and cable chamber, the internal portion top of cabinet is equipped with the generating line room, the load switch room is installed to generating line room below for the intercommunication cable, control cable power transmission, load switch room below is equipped with the fusing device, protects the short circuit of distribution branch line in the equipment, fusing device right-hand member department is equipped with the circuit breaker for cut off and put through load circuit, fusing device below is equipped with the cable chamber, install the earthing room in the lower left corner cavity of cable chamber, install earthing device in the earthing room.

According to a preferable technical scheme of the invention, a plurality of groups of bus bars are linearly and horizontally arranged in the bus chamber, three groups of bus connecting columns are arranged in one group of bus bars, a crescent elastic clamp which is pressed downwards vertically is arranged at the upper end of each bus connecting column to clamp a cable connecting end, a strip-shaped sliding groove is formed in a transverse plate for fixing the bus connecting columns, and a crescent elastic clamp which is clamped transversely is arranged in the strip-shaped sliding groove to position the bus connecting columns.

As a preferred technical scheme of the invention, the load switch chamber comprises an insulation box, SF6 conduits and a knife switch control device, wherein the upper end and the lower end of the insulation box are correspondingly provided with three groups of cylindrical embedding cavities which are horizontally arranged, conductor columns are embedded in the cylindrical embedding cavities, the connecting ends of the conductor columns are double-layer clamping heads, and the knife switch control device is arranged between the upper double-layer clamping heads and the lower double-layer clamping heads and used for controlling the connection and disconnection of the upper conductor column and the lower conductor column;

the SF6 conduit is transversely arranged at the center of the insulation box, and the SF6 conduit is

Type communicating pipe is the level setting, and is located violently pipe is violently managed for the multistage thick, the tubule is linked together in the center in the SF6 pipe, the tubule transversely runs through plug-in strip controlling means, be equipped with the drainage fan in the thick pipe, be located the leftmost end SF6 density testing stand is installed in drainage fan left side in the thick pipe, is located looksAir guide holes with upward and downward openings are formed in the thick pipe between the adjacent switch blade control devices and the front and rear guide pipes, the drainage fan at the air guide hole is arranged in an inclined manner at an angle of 45 degrees, and a guide plate frame is arranged above the air guide holes;

and an SF6 density monitoring box is arranged on the left side of the SF6 conduit and is connected with the SF6 density detection frame through a lead, and an SF6 supply tank at the right end of the central transverse pipe is communicated.

As a preferred technical scheme of the invention, the switch blade control device comprises an annular seat, a tensioning foot plate, a transmission disc and a cylindrical ring box, wherein the transmission disc is embedded into the upper and lower double-layer clamping head by the outer ring surface, the center of the transmission disc is transversely embedded and fixed with the cylindrical ring box, the wall of the cylindrical ring box is provided with a gas dispersing hole, the left end and the right end of the cylindrical ring box are coaxially fixed with a T-shaped auxiliary cylinder, the left ring wall of the T-shaped auxiliary cylinder is sleeved on the outer side wall of a short pipe and is in rotating connection with the short pipe, the left ring wall is fixedly sleeved with the annular seat, and the outer side wall of the annular seat close to the surface of the transmission disc is also hinged with a telescopic rod;

annular seat leans on upper end department articulated to be connected with vertical tensioning sole, tensioning sole installs the stopper that parallels with double-deck clamping piece head outside inclined plane topmost, with be equipped with horizontal slide rail on the tensioning sole face that double-deck clamping piece head outside vertical surface corresponds, sliding connection has the tensioning casting die that presses to double-deck clamping piece head outside vertical surface on the horizontal slide rail, annular seat leans on lower extreme department articulated to be connected with the tensioning rod, the tensioning rod slopes right and is connected with tensioning casting die left end is articulated, the telescopic link leans on inboard face department articulated connection to the left bank and tensioning sole center.

As a preferred technical solution of the present invention, the inside of the conducting disc is embedded with Y-shaped conductors, two sets of the Y-shaped conductors are symmetrically arranged up and down, and elastic conductor sheets are arranged in interlayer sheets at the upper ends of the Y-shaped conductors, the elastic conductor sheets are connected by a transverse tension spring, and the elastic conductor sheets are convex arc-shaped curved surfaces.

As a preferred technical scheme of the invention, the inside of the cylindrical ring box is coaxially embedded with a mesh conduit, the left end and the right end of the mesh conduit penetrate through the T-shaped auxiliary cylinder and are fixed with the inner wall of the short pipe, the center of the mesh conduit is fixedly sleeved with a conducting sandwich disc, the upper end and the lower end of the conducting sandwich disc are U-shaped clamping pieces, the lower end of the Y-shaped conductor is embedded into the U-shaped clamping pieces and connected, and the bottom ends of the U-shaped clamping pieces above and below are connected through a fuse.

As a preferable technical scheme of the invention, a push handle is fixed on the outer side wall of the T-shaped auxiliary barrel, the push handle is opened when the push handle inclines upwards by 45 degrees, and the push handle is disconnected when the push handle inclines downwards by 45 degrees.

As a preferred technical solution of the present invention, the fuse device includes a cable receiving plate, a stretching assembly and a fixed horizontal plate, the cable receiving plate is provided with an elastic pressing member corresponding to a lower end connector end of the conductor column below the elastic pressing member, left and right ends of the cable receiving plate are fixed to a horizontal straight plate of an L-shaped conduit plate, the stretching assembly is fixed to left and right ends of the fixed horizontal plate, a lower end of a vertical plate of the L-shaped conduit plate is connected to a bottom end face of a vertical sliding frame in the stretching assembly, a stretching spring is provided in a center of the stretching assembly, an upper end of the stretching spring is connected to a fixed column in the center of the vertical sliding frame, and the vertical sliding frame is slidably connected to an inner side wall of a fixed box outside the vertical sliding frame;

and adjacent be equipped with the control card post between the elasticity casting die, the control card post runs through the cable and accepts the vertical spout sliding connection that board and rear side set up, the control card post is linked together with stretching subassembly, circuit breaker in proper order through the wire, through circuit breaker control card post pops out, stretch and draw the subassembly pull-down cable and accept the board.

Compared with the prior art, the invention provides an alternating current metal-enclosed switchgear, which has the following beneficial effects:

1. according to the invention, the plurality of strip-shaped sliding grooves are formed in the transverse flat plate for installing the bus bar, and the crescent elastic clamps are arranged at the connecting ends of the upper ends of the bus connecting columns, so that after the cables are connected, the cable is prevented from falling off due to traction generated by the cable, when the bus connecting columns need to be added, the operation process is simple and efficient, through the arrangement structures of the knife switch control device and the SF6 guide tube, the conductor columns are enabled to be tightly connected with the conducting disc in real time in the long-term switching-on and switching-off process, gaps are prevented from being generated, poor contact is caused, and electric power use is influenced, arc extinguishing is performed by matching with SF6, the installation operation and safe operation space of equipment is ensured, and through the fusing device, the cable can be quickly separated in an integrated manner, further expansion after equipment faults are generated is prevented, and the use safety of the equipment is improved.

2. In the knife switch control device and the SF6 conduit design structure, the tensioning rod and the telescopic rod are matched for use, so that the tensioning foot plate is tightly attached to the outer surface of the conductor column, the connection firmness is improved, the conductor column and the conducting disc are in an inner clamping type conducting connection mode, and a Y-shaped conductor structure is adopted, so that the conductors can tend to expand outwards, the conductors are connected more tightly and are not easy to fall off, wherein double-layer local conducting areas are arranged, the local conducting areas are different in area and tend to separate from each other in advance, and arc extinguishing and prevention can be fully performed on the generation of electric arcs by utilizing the SF6 flow rate and the density at the cylindrical ring box under the condition that the two areas are large, so that the safety performance of the device is further improved.

Drawings

FIG. 1 is a schematic structural diagram of an AC metal-enclosed switchgear of the present invention;

FIG. 2 is an enlarged schematic view of a partial structure of the AC metal-enclosed switch of the present invention;

FIG. 3 is an enlarged view of a portion of the knife control device of the present invention;

FIG. 4 is an enlarged view of the structure at A of the present invention;

FIG. 5 is an enlarged view of a portion of the push handle of the present invention;

in the figure: 1. a cabinet body; 2. a bus bar chamber; 3. a load switch chamber; 4. a fusing device; 5. a ground chamber; 6. a circuit breaker; 7. a cable chamber; 31. an insulating case; 32. a conductor post; 33. a knife switch control device; 34. an SF6 conduit; 35. an SF6 density monitoring box; 36. an SF6 supply tank; 37. a guide plate frame; 331. an annular seat; 332. tensioning the foot plate; 333. a conductive disc; 334. a T-shaped auxiliary cylinder; 335. a cylindrical ring box; 3351. a mesh catheter; 3352. a conductive sandwich disk; 336. tensioning the pressing piece; 337. a limiting block; 338. a Y-shaped conductor; 3381. an elastic conductor sheet; 339. a tension rod; 3310. a telescopic rod; 3311. pushing the handle; 341. an SF6 density detection frame; 342. a drainage fan; 41. a cable receiving plate; 42. fixing the transverse plate; 43. an L-shaped duct plate; 44. an elastic pressing member; 45. controlling the clamping column; 46. and stretching the assembly.

Detailed Description

Referring to fig. 1, the present invention provides a technical solution: the utility model provides an exchange metal enclosed switchgear, its includes the cabinet body 1, bus-bar room 2, load switch room 3, fusing device 4, earthing room 5, circuit breaker 6 and

cable chamber

7, 1 inside top of the cabinet body is equipped with bus-bar room 2, load switch room 3 is installed to 2 belows in the bus-bar room for the intercommunication cable, control cable power transmission, 3 below of load switch room are equipped with fusing device 4, protect the short circuit of distribution branch line in the equipment, 4 right-hand member departments of fusing device are equipped with circuit breaker 6 for cut off and put through the load circuit, 4 below of fusing device are equipped with the cable chamber, install earthing room 5 in the 7 lower left corner cavity of cable chamber, install earthing device in the earthing room 5.

In this embodiment, be linear horizontal arrangement in the generating line room 2 and set up multiunit generating line row, it is a set of generating line row is equipped with three group's generating line spliced poles, just generating line spliced pole upper end is equipped with the vertical crescent elastic clamp that pushes down, presss from both sides tightly cable connection end, and is used for fixing set up the bar spout in the horizontal flat board of generating line spliced pole, the crescent elastic clamp that is equipped with horizontal centre gripping in the bar spout fixes a position the generating line spliced pole, improves cable connection's fixed strength and stability on generating line spliced pole and the generating line spliced pole, avoids the tractive of cable to rock, leads to cable and generating line spliced pole link to drop.

Referring to fig. 2 and 3, in this embodiment, the load switch chamber 3 includes an insulation box 31, an SF6 conduit 34, and a knife switch control device 33, where the upper and lower ends of the insulation box 31 are correspondingly provided with three sets of cylindrical embedded cavities, the cylindrical embedded cavities are embedded with conductor posts 32, the connection ends of the conductor posts 32 are double-layer clip heads, and the knife switch control device 33 is provided between the upper and lower double-layer clip heads to control the connection and disconnection of the upper and lower conductor posts 32;

the SF6 conduit 34 is transversely arranged at the center of the insulation box 31, and the SF6 conduit 34 is

The type communicating pipe is horizontally arranged, the central transverse pipe in the SF6 conduit is formed by a plurality of sections of thick thin pipes which are communicated, the thin pipes transversely penetrate through the knife switch control device 33, a drainage fan 342 is arranged in each thick pipe, an SF6 density detection frame 341 is installed on the left side of the drainage fan 342 in each thick pipe at the leftmost end, air guide holes with upward and downward openings are formed in the thick pipes between the adjacent knife switch control devices 33 and the conduits in the front and the rear, the drainage fan 342 at the air guide holes is inclined by 45 degrees, and a guide plate frame 37 is arranged above the air guide holes;

an SF6 density monitoring box 35 is arranged on the left side of the SF6 guide pipe 34 and is connected with the SF6 density detection frame 341 through a lead, and an SF6 supply tank 36 at the right end of the central transverse pipe is communicated with the central transverse pipe;

as the best embodiment, under the cooperation of the drainage fan 342, the guide plate frame 37 and the SF6 guide pipe 34, the SF6 gas is promoted to form a regular flowing trend in the insulation box 34, and the SF6 gas density is detected in real time by the SF6 density detection frame 341, so that the concentration of the SF6 reaches the optimal concentration required for arc extinction, and the impact force generated by the gas flow is utilized to further disperse and prevent the electric arc, thereby ensuring the safe operation of the equipment.

Referring to fig. 4, in this embodiment, the switch blade control device 33 includes an annular seat 331, a tensioning foot plate 332, a conducting disc 333 and a cylindrical ring box 335, the conducting disc 333 is embedded into the inside of the upper and lower double-layer clip heads by the outer ring surface, and the center of the conducting disc 333 is transversely embedded and fixed with the cylindrical ring box 335, the wall of the cylindrical ring box 335 is provided with an air dispersing hole, the left and right ends of the cylindrical ring box 335 are coaxially fixed with a T-shaped auxiliary cylinder 334, the left ring wall of the T-shaped auxiliary cylinder 334 is sleeved on the outer wall of the short tube for rotation connection, the annular seat 331 is fixedly sleeved on the left ring wall, and the outer wall of the annular seat 331 near the plate surface of the conducting disc 333 is further hinged with a telescopic rod 3310;

the annular seat 331 is hinged and connected with a vertical tensioning foot plate 332 near the upper end, the uppermost end of the tensioning foot plate 332 is provided with a limiting block 337 parallel to an inclined plane outside the double-layer clamping piece, a transverse sliding rail is arranged on the surface of the tensioning foot plate 332 corresponding to the vertical plane outside the double-layer clamping piece, the transverse sliding rail is connected with a tensioning pressing piece 336 pressing against the vertical plane outside the double-layer clamping piece in a sliding manner, the annular seat 331 is hinged and connected with a tensioning rod 339 near the lower end, the tensioning rod 339 inclines rightwards and is hinged and connected with the left end of the tensioning pressing piece 336, and the telescopic rod 3310 inclines leftwards and is hinged and connected with the surface of the inner side of the center of the tensioning foot plate 332;

as a preferred embodiment, the tension rod 339 is in a stretched state in real time, the telescopic rod 3310 is in a tensioned state, and the range of the inclination angle of the tension rod 339 is 60 ° to 80 ° from the right horizontal plane, wherein the gap between the tension pressing piece 332 and the side surface of the conducting disc 33 needs to be slightly smaller than the thickness of the single-piece conductor of the dual-layer clip head, the surface of the tension pressing piece 332 contacting the single-piece conductor is a curved surface, so as to be in sliding fit, reduce friction, push the tension pressing piece 332 to slide leftward, press down the tension rod 339, and simultaneously drive it to rotate outward, and stop to form an inclination of 70 ° from the right horizontal plane, thereby providing the best clamping tension for laterally clamping the single-piece conductor.

Referring to fig. 5, in the present embodiment, the Y-shaped conductors 338 are embedded in the conducting disc 333, two sets of Y-shaped conductors 338 are symmetrically arranged up and down, an elastic conductor sheet 3381 is disposed in a sandwich sheet at the upper end of each Y-shaped conductor 338, the elastic conductor sheets 3381 are connected by a transverse tension spring, and the elastic conductor sheets 3381 are convex arc-shaped curved surfaces, wherein a sector area of the elastic conductor sheet 3381 is a 30 ° included angle area for the conductors of the Y-shaped conductors 338 to communicate, and the area surface of the remaining conducting disc 333 is an insulating surface.

In this embodiment, a mesh guide pipe 3351 is coaxially embedded in the cylindrical ring box 335, the left end and the right end of the mesh guide pipe 3351 penetrate through the T-shaped auxiliary cylinder 334 to be fixed to the inner wall of the short pipe, a conductive interlayer disc 3352 is fixedly sleeved at the center of the mesh guide pipe 3351, the upper end and the lower end of the conductive interlayer disc 3352 are U-shaped clamping pieces, the lower end of the Y-shaped conductor 338 is embedded in the U-shaped clamping pieces to be connected, and the bottom ends of the U-shaped clamping pieces above and below are connected through a fuse;

as the best embodiment, the U-shaped clamping piece transmitted to the sandwich plate 3352 is transmitted to the area with an included angle of 20 degrees, which is smaller than the main conductive area of the elastic conductor piece 3381, in the process of breaking the brake, the U-shaped clamping piece tends to be separated from the conductive surface at the lower end of the Y-shaped conductor 338 in advance, meanwhile, the SF6 flow rate guided by the drainage fan 342 passing through the inside of the mesh conduit 3351 is larger, so that the SF6 can achieve the best arc extinguishing effect, and meanwhile, when the current is abnormally increased to a certain height and heat degree, the fuse can fuse and cut off the current by itself, thereby protecting the safe operation of the circuit.

In this embodiment, a push handle 3311 is fixed to the outer side wall of the T-shaped auxiliary tube 334, the push handle 3311 is inclined upward by 45 ° to be opened, the push handle 3311 is inclined downward by 45 ° to be opened, and an insulating flexible sealing sleeve is sleeved outside the push handle 3311.

In this embodiment, the fuse device 4 includes a cable receiving plate 41, a stretching assembly 46, and a fixing horizontal plate 42, where an elastic pressing member 44 is installed on the cable receiving plate 41, and corresponds to a lower end joint end of the conductor column 33 below, the left and right ends of the cable receiving plate 41 are fixed to a horizontal plate of an L-shaped conduit plate 43, the stretching assembly 46 is fixed to the left and right ends of the fixing horizontal plate 42, the lower end of a vertical plate of the L-shaped conduit plate 43 is connected to a bottom end face of a vertical sliding frame in the stretching assembly 46, an extension spring is disposed in the center of the stretching assembly 46, the upper end of the extension spring is connected to a fixed column in the center of the vertical sliding frame, and the vertical sliding frame is slidably connected to an inner side wall of an outer fixing box thereof;

and it is adjacent be equipped with control card post 45 between the elastic pressing part 44, control card post 45 runs through the vertical spout sliding connection that cable accepting board 41 and rear side set up, control card post 45 is linked together with stretching subassembly 46, circuit breaker 6 through the wire in proper order, through circuit breaker 6 control card post 45 pops out, stretching subassembly 46 pulls down cable accepting board 41.

In the specific implementation, the cable is fixed through the cable chamber 7 and connected with the connecting piece at the upper left end of the cable chamber 7, the cable bearing plate 41 is pushed upwards, the elastic pressing piece 44 connected with the cable is embedded into the conductor post 32 transmission groove at the lower end of the insulating box 31 for fixing, at the moment, the control clamping post 45 is embedded into the vertical sliding groove for clamping and connecting, the stretching assembly 46 is in a stretching state, after the cable is connected on the bus bar in the bus chamber 2, the cables are further pressed and fixed by the crescent elastic clamp, the bus bar is added quickly by structural design of a strip-shaped sliding groove and the like arranged in the transverse flat plate, after the cables are all connected, the T-shaped auxiliary cylinder 334 fixed at the lower end of the push handle 3311 is pushed upwards by the push handle 3311 to rotate along the outer wall surface of the short tube, so as to drive the tensioning foot plate 332, the cylindrical ring box 335 and the conducting disc 333 to rotate upwards, the elastic conductor sheet 3381 at the upper end of the Y-shaped conductor 338 is slowly contacted with the inner side of the double-layer clip head at the connecting end of the conductor column 32, the outer side limiting block 337 is matched with the inclined surface at the connecting end of the conductor column 32 for limiting, the tensioning pressing piece 336 is further pressed against the tensioning rod 339 by the transverse tension generated by the left and right side surfaces of the conductor column 32, so that the double-layer clip head is tightly attached to the Y-shaped conductor 338, by pushing the push handle 3311 downward, the Y-shaped conductor 338 is disengaged from the double-layered clip head, and here, driven synchronously by the drainage fan 342, the SF6 gas is guided to blow to the connecting end of the Y-shaped conductor 338 to extinguish the arc generated when the Y-shaped conductor is disconnected, the SF6 gas has certain flow velocity to assist in dispersing the arc and organizing the generation of the arc, the density of the SF6 is detected in real time by the SF6 density detecting rack 341, so that the SF6 is supplied to the SF6 supply tank 36 in time, and the regular flow of the internal SF6 is promoted by the diversion plate rack 37.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. The utility model provides an exchange metal enclosed switchgear, its includes cabinet body (1), bus-bar room (2), load switch room (3), fusing device (4), earthing room (5), circuit breaker (6) and cable chamber (7), its characterized in that: a bus chamber (2) is arranged above the inside of the cabinet body (1), a load switch chamber (3) is arranged below the bus chamber (2) and used for communicating a cable and controlling power transmission of the cable, a fuse device (4) is arranged below the load switch chamber (3) and used for protecting a short circuit of a power distribution branch line in equipment, a circuit breaker (6) is arranged at the right end of the fuse device (4) and used for cutting off and connecting a load circuit, a cable chamber is arranged below the fuse device (4), a grounding chamber (5) is arranged in a cavity at the lower left corner of the cable chamber (7), and a grounding device is arranged in the grounding chamber (5);

the load switch chamber (3) comprises an insulation box (31), SF6 guide pipes (34) and a knife switch control device (33), wherein the upper end and the lower end of the insulation box (31) are correspondingly provided with three groups of cylindrical embedded cavities which are horizontally arranged, conductor columns (32) are embedded in the cylindrical embedded cavities, the connecting ends of the conductor columns (32) are double-layer clamping heads, the knife switch control device (33) is arranged between the double-layer clamping heads above and below the double-layer clamping heads to control the connection and disconnection of the conductor columns (32) above and below the double-layer clamping heads;

the SF6 pipe (34) transversely sets up the center in insulating case (31), SF6 pipe (34) are the level setting, and are located the center in the SF6 pipe is violently managed and is linked together for the multistage is thick, the tubule transversely runs through plug-in strip controlling means (33), be equipped with drainage fan (342) in the thick pipe, be located the leftmost end in the thick pipe drainage fan (342) left side is installed SF6 density and is detected frame (341), be located adjacent all set up opening in thick pipe between plug-in strip controlling means (33) and the pipe of front and back upwards, decurrent air guide hole has all been seted up, drainage fan (342) slope 45 of air guide hole department sets up, just the air guide hole top still is equipped with diversion grillage (37);

an SF6 density monitoring box (35) is arranged on the left side of the SF6 guide pipe (34) and is connected with the SF6 density detecting frame (341) through a lead, and an SF6 supply tank (36) is arranged at the right end of the central transverse pipe and is communicated with the central transverse pipe; the knife switch control device (33) comprises an annular seat (331), a tensioning foot plate (332), a conducting disc (333) and a cylindrical ring box (335), wherein the conducting disc (333) is embedded into the upper and lower double-layer clamping head by the outer ring surface, the center of the conducting disc (333) is transversely embedded and fixed with the cylindrical ring box (335), the wall of the cylindrical ring box (335) is provided with an air dispersing hole, the left end and the right end of the cylindrical ring box (335) are coaxially fixed with a T-shaped auxiliary cylinder (334), the left ring wall of the T-shaped auxiliary cylinder (334) is sleeved on the outer side wall of the short pipe to be rotatably connected, the annular seat (331) is fixedly sleeved on the left ring wall, and the outer side wall of the annular seat (331) close to the plate surface of the conducting disc (333) is also hinged with a telescopic rod (3310);

the clamping device is characterized in that a vertical tensioning foot plate (332) is hinged to the upper end of the annular seat (331) in a position close to the upper end, a limiting block (337) parallel to an inclined surface on the outer side of the double-layer clamping piece is mounted at the uppermost end of the tensioning foot plate (332), a transverse sliding rail is arranged on the surface of the tensioning foot plate (332) corresponding to the vertical surface on the outer side of the double-layer clamping piece, a tensioning pressing piece (336) pressing the vertical surface on the outer side of the double-layer clamping piece is connected to the transverse sliding rail in a sliding mode, a tensioning rod (339) is hinged to the lower end of the annular seat (331) in a position close to the lower end, the tensioning rod (339) inclines rightwards and is hinged to the left end of the tensioning pressing piece (336), and the telescopic rod (3310) inclines leftwards and is hinged to the position close to the inner side of the center of the tensioning foot plate (332);

y-shaped conductors (338) are embedded into the conducting disc (333) and are symmetrically arranged in two groups up and down, elastic conductor sheets (3381) are arranged in a sandwich sheet at the upper end of each Y-shaped conductor (338), the elastic conductor sheets (3381) are connected through transverse tensioning springs, and the elastic conductor sheets (3381) are in an outer convex arc-shaped curved surface;

a push handle (3311) is fixed on the outer side wall of the T-shaped auxiliary barrel (334), the push handle (3311) is opened when inclined upwards by 45 degrees, and the push handle (3311) is disconnected when inclined downwards by 45 degrees;

a mesh guide pipe (3351) is coaxially embedded in the cylindrical ring box (335), the left end and the right end of the mesh guide pipe (3351) penetrate through the T-shaped auxiliary cylinder (334) and are fixed with the inner wall of the short pipe, a conductive sandwich plate (3352) is fixedly sleeved in the center of the mesh guide pipe (3351), the upper end and the lower end of the conductive sandwich plate (3352) are provided with U-shaped clamping pieces, the lower end of the Y-shaped conductor (338) is embedded into the U-shaped clamping pieces and connected, and the bottom ends of the U-shaped clamping pieces above and below are connected through a fuse;

the fusing device (4) comprises a cable bearing plate (41), a stretching assembly (46) and a fixed transverse plate (42), an elastic pressing piece (44) is mounted on the cable bearing plate (41) and corresponds to the joint end of the lower end of the conductor column (32) below, the left end and the right end of the cable bearing plate (41) are fixed with a horizontal straight plate of an L-shaped guide pipe plate (43), the stretching assembly (46) is fixed at the left end and the right end of the fixed transverse plate (42), the lower end of the vertical plate of the L-shaped guide pipe plate (43) is connected with the bottom end face of a vertical sliding frame in the stretching assembly (46), an extension spring is arranged in the center of the stretching assembly (46), the upper end of the extension spring is connected with a fixed column in the center of the vertical sliding frame, and the vertical sliding frame is connected with the inner side wall of the fixed box outside the vertical sliding frame in a sliding manner;

and adjacent be equipped with control card post (45) between elasticity casting die (44), control card post (45) run through the cable and accept vertical spout sliding connection that board (41) and rear side set up, control card post (45) are linked together with stretching subassembly (46), circuit breaker (6) in proper order through the wire, through circuit breaker (6) control card post (45) pop out, stretch and draw subassembly (46) pull-down cable and accept board (41).

2. An ac metal enclosed switchgear as claimed in claim 1, wherein: it sets up multiunit generating line row, and is a set of to be linear horizontal arrangement in generating line room (2) generating line row is equipped with three group's generating line spliced poles, just generating line spliced pole upper end is equipped with the vertical crescent elasticity clamp that pushes down, presss from both sides tightly cable connection end, and is used for fixing set up the bar spout in the horizontal flat board of generating line spliced pole, be equipped with the crescent elasticity clamp of horizontal centre gripping in the bar spout, fix a position the generating line spliced pole.