Double-break isolating switch

Abstract

The utility model provides a double-break disconnecting switch, which is characterized in that a plurality of cavities are arranged in a shell, double-break switch devices are arranged in the cavities, a first static contact and a second static contact are arranged in the cavities, and a moving contact seat is fixed in the cavities through an insulating table. The first extension end of the moving contact seat is provided with a first movable cavity for the first moving contact to move, the second extension end of the moving contact seat is provided with a second movable cavity for the second moving contact to move, and the driving mechanism drives the first transmission assembly to drive the first moving contact to extend out of the first movable cavity to be in contact with the first static contact. The second transmission assembly is driven to drive the second moving contact to extend out of the second moving cavity to be in contact with the second static contact, or the first transmission assembly is driven to drive the first moving contact to be separated from the first static contact, and the second transmission assembly is driven to drive the second moving contact to be separated from the second static contact; therefore, the double-break switch devices in the plurality of cavities can be switched on or switched off synchronously.

Description

Technical Field

[0001] The utility model relates to the field of disconnectors, in particular to a double-break disconnector. Background Art

[0002] A gas-insulated metal-enclosed switchgear (GIS, GAS INSULATED SWITCHGEAR) is a switchgear composed of a circuit breaker, a disconnector, an earthing switch, a current transformer, a voltage transformer, a lightning arrester, a bushing, a busbar, etc. SF6 gas is used as the insulating and arc-extinguishing medium inside it. Because of its characteristics such as small floor area and full enclosure, it is widely used in substations at all levels. The function of the disconnector is to isolate the circuit in the open position, reliably isolate the de-energized part (such as the circuit breaker) from the energized part (such as the busbar), and ensure that there is an insulation distance that meets the specified requirements between the contacts; in the closed position, it conducts the circuit, carries the normal working current and the short-circuit current under abnormal conditions, and can switch the bus transfer current and the bus charging current.

[0003] However, since there is only one isolation break (an isolation break formed by a moving contact and a static contact) between the spare expansion interval or the in-service interval of the existing GIS product and the operating busbar, during the interval expansion installation and on-site AC withstand voltage test, if the break is accidentally broken down, the internal electrical insulation cannot be guaranteed, which will affect the safety of the equipment and personnel on both sides. Therefore, there is an urgent need for a disconnector with two series-disconnected points in the circuit. Summary of the Utility Model

[0004] In view of this, the embodiment of the utility model provides a double-break disconnector, which can ensure the internal electrical insulation by another break when one break is accidentally broken down, so as to improve the safety of the equipment and personnel on both sides of the disconnector break.

[0005] To achieve the above object, the embodiment of the utility model provides the following technical solutions:

[0006] A double-break disconnector includes: a housing, a plurality of double-break switch devices, and a plurality of driving mechanisms;

[0007] A plurality of cavities are formed in the housing;

[0008] A plurality of double-break switch devices are arranged in the plurality of cavities;

[0009] The double-break switch device includes an insulating platform, a moving contact seat, a first moving contact, a second moving contact, a first transmission component, a second transmission component, a first static contact, and a second static contact;

[0010] The first static contact and the second static contact are both arranged in the cavity;

[0011] The moving contact seat is fixed in the cavity through the insulating platform;

[0012] The moving contact seat has a first protruding end and a second protruding end. A first moving cavity for the movement of the first moving contact is provided at the first protruding end;

[0013] A second moving cavity for the movement of the second moving contact is provided at the second protruding end;

[0014] The driving mechanism is used to drive the first transmission component to drive the first moving contact to extend from the first moving cavity to contact the first static contact, and drive the second transmission component to drive the second moving contact to extend from the second moving cavity to contact the second static contact, or drive the first transmission component to drive the first moving contact to separate from the first static contact, and drive the second transmission component to drive the second moving contact to separate from the second static contact, so as to realize the synchronous closing or opening of the double-break switch device in multiple cavities.

[0015] Preferably, the first moving cavity is coaxially arranged with the first static contact;

[0016] The second moving cavity is coaxially arranged with the second static contact.

[0017] Preferably, the cavity includes a first channel and a second channel;

[0018] The first channel is opened along the vertical direction of the housing;

[0019] The second channel is opened along the horizontal direction of the housing, and the second channel communicates with the lower end of the first channel;

[0020] The first end of the moving contact seat is arranged in the first channel, and the second end is arranged in the second channel;

[0021] The first static contact is arranged at the second end of the first channel;

[0022] The second static contact is arranged at the first end of the second channel.

[0023] Preferably, the driving mechanism includes: a power mechanism and a transmission shaft;

[0024] The housing is provided with a channel for the transmission shaft to pass through, and the channel communicates with multiple cavities;

[0025] The transmission shaft is rotatably arranged in the channel;

[0026] One end of the transmission shaft is in transmission connection with the power mechanism, and the power mechanism drives the first transmission component and the second transmission component in multiple cavities to act simultaneously through the transmission shaft.

[0027] Preferably, the first transmission component is the same as the second transmission component;

[0028] The first transmission component includes: a driven gear, a transmission gear, a transmission lead screw, a bearing and a transmission nut;

[0029] The driving lead screw is arranged in the first moving cavity through bearings;

[0030] The driven gear is arranged on the transmission shaft;

[0031] The driving gear is arranged at the first end of the driving lead screw and meshes with the driven gear;

[0032] A receiving cavity for the driving lead screw to extend into is formed at the first end of the first moving contact;

[0033] The driving nut is arranged at the first end of the first moving contact;

[0034] The driving lead screw is in threaded fit with the driving nut.

[0035] Preferably, the transmission shaft is composed of a first sub-transmission shaft and a plurality of second sub-transmission shafts;

[0036] One end of the first sub-transmission shaft is in transmission connection with the power mechanism, and the other end is in transmission connection with another second sub-transmission shaft through a second sub-transmission shaft, wherein the second sub-transmission shaft is arranged between adjacent cavities;

[0037] Both the first sub-transmission shaft and the second sub-transmission shaft include an insulating tube and a connector, and connectors are provided at both ends of the insulating tube.

[0038] Preferably, the insulating tube is made of vacuum-impregnated epoxy fiberglass cloth,

[0039] and / or the connector is made of aluminum alloy.

[0040] Preferably, it further includes: an operating shaft and a plurality of earthing switches arranged outside the housing, wherein the number of earthing switches corresponds to the number of cavities;

[0041] The power mechanism also drives the plurality of earthing switches to open and close synchronously through the operating shaft.

[0042] Preferably, the operating shaft includes: a first connecting shaft and a plurality of second connecting shafts;

[0043] One end of the first connecting shaft is in transmission connection with the power mechanism, and the other end is in transmission connection with another second connecting shaft through a second connecting shaft, wherein the second connecting shaft is arranged between adjacent earthing switches.

[0044] Preferably, the power mechanism includes: a motor, a first bevel gear, a second bevel gear, a worm, a worm gear, a first sprocket, a second sprocket and a chain;

[0045] The first bevel gear is arranged on the rotating shaft of the motor;

[0046] The second bevel gear is arranged at one end of the worm and meshes with the first bevel gear;

[0047] The worm meshes with the worm gear;

[0048] The transmission shaft is connected to the worm gear and is coaxially arranged with the worm gear;

[0049] The first sprocket is arranged on the worm gear and is coaxially arranged with the worm gear;

[0050] The first sprocket is drivingly connected to the second sprocket through a chain;

[0051] The second sprocket is connected to the operating shaft and is coaxially arranged with the operating shaft.

[0052] Based on the above-mentioned double-break disconnecting switch provided by the present utility model, by opening a plurality of cavities in the housing, and arranging double-break switch devices in the plurality of cavities, and arranging both the first static contact and the second static contact in the cavity, the moving contact seat is fixed in the cavity through an insulating platform. The moving contact seat has a first protruding end and a second protruding end. The first protruding end is provided with a first moving cavity for the movement of the first moving contact, and the second protruding end is provided with a second moving cavity for the movement of the second moving contact. And the driving mechanism drives the first transmission component to drive the first moving contact to protrude from the first moving cavity to contact the first static contact, and drives the second transmission component to drive the second moving contact to protrude from the second moving cavity to contact the second static contact, or drives the first transmission component to drive the first moving contact to separate from the first static contact, and drives the second transmission component to drive the second moving contact to separate from the second static contact, so as to realize the synchronous closing or opening of the double-break switch devices in the plurality of cavities. Through the above-mentioned disclosed double-break disconnecting switch, during the interval expansion installation and on-site AC withstand voltage test, if one of the breaks formed by the moving contact and the static contact is accidentally broken down, the other break formed by the moving contact and the static contact can ensure the internal electrical insulation, effectively improving the safety of the equipment and personnel on both sides of the disconnecting switch. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0054] Figure 1 It is a schematic structural diagram of a double-break disconnecting switch provided by an embodiment of the present utility model;

[0055] Figure 2 It is a schematic structural diagram of the double-break switch device provided by an embodiment of the present utility model;

[0056] Figure 3 It is a schematic top view structural diagram of the double-break disconnecting switch provided by an embodiment of the present utility model;

[0057] Figure 4 Structural schematic diagram of the power mechanism provided by the embodiment of the present utility model;

[0058] Figure 5 Synchronization closing schematic diagram of the double-break switch device and the earthing switch provided by the embodiment of the present utility model;

[0059] Figure 6 Synchronization opening schematic diagram of the double-break switch device and the earthing switch provided by the embodiment of the present utility model.

[0060] Wherein, the housing 1, the first channel 11, the second channel 12; the power mechanism 21, the motor 211, the first bevel gear 212, the second bevel gear 213, the worm 214, the worm gear 215, the first sprocket 216, the second sprocket 217, the chain 218, the transmission shaft 22, the first sub-transmission shaft 221, the second sub-transmission shaft 222; the insulating platform 31, the moving contact seat 32, the first moving contact 33, the second moving contact 34, the first transmission assembly 35, the driven gear 351, the driving gear 352, the transmission screw 353, the bearing 354, the transmission nut 355, the second transmission assembly 36, the first static contact 37, the second static contact 38; the operating shaft 4, the first connecting shaft 41, the second connecting shaft 42; the earthing switch 5. Detailed implementation manners

[0061] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0062] The embodiment of the present utility model provides a double-break disconnector, see Figures 1 to 6 , Figure 1 which is the structural schematic diagram of the double-break disconnector. The double-break disconnector includes: a housing 1, a plurality of double-break switch devices and a plurality of driving mechanisms;

[0063] A plurality of cavities are formed in the housing 1;

[0064] A plurality of double-break switch devices are arranged in the plurality of cavities;

[0065] The double-break switch device includes an insulating platform 31, a moving contact seat 32, a first moving contact 33, a second moving contact 34, a first transmission assembly 35, a second transmission assembly 36, a first static contact 37 and a second static contact 38;

[0066] Both the first static contact 37 and the second static contact 38 are arranged in the cavity;

[0067] The moving contact seat 32 is fixed in the cavity through the insulating platform 31;

[0068] The moving contact seat 32 has a first protruding end and a second protruding end. The first protruding end is provided with a first moving cavity for the movement of the first moving contact 33;

[0069] The second protruding end is provided with a second moving cavity for the movement of the second moving contact 34;

[0070] The driving mechanism is used to drive the first transmission component 35 to drive the first moving contact 33 to extend from the first moving cavity to contact the first static contact 37, and to drive the second transmission component 36 to drive the second moving contact 34 to extend from the second moving cavity to contact the second static contact 38, or to drive the first transmission component 35 to drive the first moving contact 33 to separate from the first static contact 37, and to drive the second transmission component 36 to drive the second moving contact 34 to separate from the second static contact 38, so as to realize the synchronous closing or opening of the double-break switch devices in multiple cavities.

[0071] In the embodiment of the present utility model, by providing a plurality of cavities in the housing 1, and providing double-break switch devices in each of the plurality of cavities, and arranging both the first static contact 37 and the second static contact 38 in the cavity, the moving contact seat 32 is fixed in the cavity through the insulating platform 31. The moving contact seat 32 has a first protruding end and a second protruding end. The first protruding end is provided with a first moving cavity for the movement of the first moving contact 33, and the second protruding end is provided with a second moving cavity for the movement of the second moving contact 34. And the driving mechanism is used to drive the first transmission component 35 to drive the first moving contact 33 to extend from the first moving cavity to contact the first static contact 37, and to drive the second transmission component 36 to drive the second moving contact 34 to extend from the second moving cavity to contact the second static contact 38, or to drive the first transmission component 35 to drive the first moving contact 33 to separate from the first static contact 37, and to drive the second transmission component 36 to drive the second moving contact 34 to separate from the second static contact 38, so as to realize the synchronous closing or opening of the double-break switch devices in multiple cavities. Through the double-break disconnector disclosed above, during the interval extension installation and on-site AC withstand voltage test, if one of the breaks formed by the moving contact and the static contact breaks down accidentally, the break formed by the other moving contact and the static contact can ensure the internal electrical insulation, effectively improving the safety of the equipment and personnel on both sides of the disconnector.

[0072] Preferably, the first static contact 37 is fixed in the first moving cavity through an insulating disc, and the second static contact 38 is fixed in the second moving cavity through an insulating disc.

[0073] Specifically, the first moving cavity is coaxially arranged with the first static contact 37;

[0074] The second moving cavity is coaxially arranged with the second static contact 38.

[0075] It should be noted that the first movable chamber is coaxially arranged with the first static contact 37, and the second movable chamber is coaxially arranged with the second static contact 38, so that under the drive of the first transmission component 35, it can be ensured that the first movable contact 33 can be accurately docked with the first static contact 37 after being extended, and under the action of the second transmission component 36, the second movable contact 34 can be accurately docked with the second static contact 38 after being extended.

[0076] Specifically, the cavity includes a first channel 11 and a second channel 12;

[0077] The first channel 11 is opened along the vertical direction of the housing 1;

[0078] The second channel 12 is opened along the horizontal direction of the housing 1, and the second channel 12 is connected to the lower end of the first channel 11;

[0079] The first end of the moving contact seat 32 is arranged in the first channel 11, and the second end is arranged in the second channel 12;

[0080] The first stationary contact 37 is disposed at the second end of the first channel 11;

[0081] The second stationary contact 38 is disposed at a first end of the second channel 12 .

[0082] It should be noted that the cavity is set as a first channel 11 and a second channel 12, and the first channel 11 is opened along the vertical direction of the body, the second channel 12 is opened along the horizontal direction of the shell 1, and the second channel 12 is connected to the lower end of the first channel 11, the first end of the moving contact seat 32 is set in the first channel 11, and the second end is set in the second channel 12, the first static contact 37 is set at the second end of the first channel 11, and the second static contact 38 is set at the first end of the second channel 12, which can effectively reduce the size of the double-break disconnector.

[0083] Specifically, the driving mechanism includes: a power mechanism and a transmission shaft 22;

[0084] The housing 1 is provided with a passage for the transmission shaft 22 to pass through, and the passage is connected to a plurality of cavities;

[0085] The transmission shaft 22 is rotatably disposed in the channel;

[0086] One end of the transmission shaft 22 is transmission-connected to the power mechanism, and the power mechanism drives the first transmission components 35 and the second transmission components 36 in the multiple cavities to move simultaneously through the transmission shaft 22 .

[0087] It should be noted that by opening a channel in the housing 1 for the transmission shaft 22 to pass through and connecting the channel to multiple cavities, the transmission shaft 22 is rotatably arranged in the channel. One end of the transmission shaft 22 is in transmission connection with the power mechanism. The power mechanism drives the first transmission assembly 35 and the second transmission assembly 36 in multiple cavities to act simultaneously through the transmission shaft 22. Furthermore, the first transmission assembly 35 can drive the first moving contact 33 to extend out and the second transmission assembly 36 can drive the second moving contact 34 to extend out synchronously, or the first transmission assembly 35 can drive the first moving contact 33 to separate from the first static contact 37 and the second transmission assembly 36 can drive the second moving contact 34 to separate from the second static contact 38 synchronously, realizing the synchronous closing or opening of the double-break switch device in the cavity.

[0088] Furthermore, the first transmission assembly 35 is the same as the second transmission assembly 36;

[0089] The first transmission assembly 35 includes: a driven gear 351, a transmission gear 352, a transmission lead screw 353, a bearing 354, and a transmission nut 355;

[0090] The transmission lead screw 353 is arranged in the first moving cavity through the bearing 354;

[0091] The driven gear 351 is arranged on the transmission shaft 22;

[0092] The transmission gear 352 is arranged at the first end of the transmission lead screw 353 and meshes with the driven gear 351;

[0093] A receiving cavity for the transmission lead screw 353 to extend into is opened at the first end of the first moving contact 33;

[0094] The transmission nut 355 is arranged at the first end of the first moving contact 33;

[0095] The transmission lead screw 353 is in threaded cooperation with the transmission nut 355.

[0096] It should be noted that the first transmission assembly 35 and the second transmission assembly 36 are set to be the same, and the first transmission assembly 35 is set to include a driven gear 351, a transmission gear 352, a transmission lead screw 353, a bearing 354, and a transmission nut 355. The transmission lead screw 353 is arranged in the first movable cavity through the bearing 354, the driven gear 351 is arranged on the transmission shaft 22, the transmission gear 352 is arranged at the first end of the transmission lead screw 353 and meshes with the driven gear 351. A receiving cavity for the transmission lead screw 353 to extend into is formed at the first end of the first moving contact 33. The transmission nut 355 is arranged at the first end of the first moving contact 33, and the transmission lead screw 353 is in threaded cooperation with the transmission nut 355. Thus, when the transmission shaft 22 rotates, it can drive the transmission lead screw 353 to rotate through the meshing of the driven gear 351 and the transmission gear 352. Since the transmission lead screw 353 is in threaded cooperation with the transmission nut 355, when the transmission lead screw 353 rotates, the transmission nut 355 can drive the first moving contact 33 to move axially along the first movable cavity, so as to drive the first moving contact 33 to extend or retract.

[0097] Specifically, the transmission shaft 22 is composed of a first sub-transmission shaft 221 and a plurality of second sub-transmission shafts 222;

[0098] One end of the first sub-transmission shaft 221 is in transmission connection with the power mechanism, and the other end is in transmission connection with another second sub-transmission shaft 222 through a second sub-transmission shaft 222, wherein the second sub-transmission shafts 222 are arranged between adjacent cavities;

[0099] Both the first sub-transmission shaft 221 and the second sub-transmission shafts 222 are insulated and include an insulating tube and a joint. Specifically, joints are provided at both ends of the insulating tube.

[0100] It should be noted that the transmission shaft is set to be the first sub-transmission shaft 221 and a plurality of second sub-transmission shafts 222. One end of the first sub-transmission shaft 221 is in transmission connection with the power mechanism, and the other end is in transmission connection with another second sub-transmission shaft 222 through a second sub-transmission shaft 222, and the second sub-transmission shafts 222 are arranged between adjacent cavities, thereby ensuring insulation between different cavities.

[0101] Specifically, the insulating tube is made of vacuum-impregnated epoxy fiberglass cloth,

[0102] and / or the joint is made of aluminum alloy.

[0103] It should be noted that the insulating tube can be made of vacuum-impregnated epoxy fiberglass cloth or other insulating materials, and those skilled in the art can select according to requirements.

[0104] The joint can be made of aluminum alloy or other materials, and those skilled in the art can select according to requirements.

[0105] Furthermore, the double-break disconnecting switch further includes an operating shaft 4 and a plurality of earthing switches 5 disposed outside the housing 1, wherein the number of the earthing switches 5 corresponds to the number of cavities;

[0106] The power mechanism also drives the plurality of earthing switches 5 to open and close synchronously through the operating shaft 4.

[0107] It should be noted that by providing the operating shaft 4 and the plurality of earthing switches 5, and setting the number of the earthing switches 5 to be the same as the number of cavities, and then disposing the earthing switches 5 outside the housing 1, and driving the plurality of earthing switches 5 to open and close synchronously through the power mechanism via the operating shaft 4, the synchronous opening and closing of the plurality of earthing switches 5 is achieved.

[0108] Specifically, the operating shaft 4 includes a first connecting shaft 41 and a plurality of second connecting shafts 42;

[0109] One end of the first connecting shaft 41 is in transmission connection with the power mechanism, and the other end is in transmission connection with another second connecting shaft 42 through a second connecting shaft 42, wherein the second connecting shafts 42 are disposed between adjacent earthing switches 5.

[0110] It should be noted that one end of the first connecting shaft 41 is in transmission connection with the power mechanism, the other end is in transmission connection with another second connecting shaft 42 through a second connecting shaft 42, and the second connecting shafts 42 are disposed between adjacent earthing switches 5, which can effectively ensure the conduction between adjacent earthing switches 5 while ensuring the synchronous opening and closing of adjacent earthing switches 5.

[0111] Specifically, the power mechanism includes a motor 211, a first bevel gear 212, a second bevel gear 213, a worm 214, a worm gear 215, a first sprocket 216, a second sprocket 217 and a chain 218;

[0112] The first bevel gear 212 is disposed on the rotating shaft of the motor 211;

[0113] The second bevel gear 213 is disposed at one end of the worm 214 and meshes with the first bevel gear 212;

[0114] The worm 214 meshes with the worm gear 215;

[0115] The transmission shaft 22 is connected to the worm gear 215 and is coaxially arranged with the worm gear 215;

[0116] The first sprocket 216 is disposed on the worm gear 215 and is coaxially arranged with the worm gear 215;

[0117] The first sprocket 216 is in transmission connection with the second sprocket 217 through the chain 218;

[0118] The second sprocket 217 is connected to the operating shaft 4 and is coaxially arranged with the operating shaft 4.

[0119] It should be noted that the first bevel gear 212 is arranged on the rotating shaft of the motor 211, the second bevel gear 213 is arranged at one end of the worm 214 and meshes with the first bevel gear 212. The worm 214 meshes with the worm gear 215. The transmission shaft 22 is connected to the worm gear 215 and is coaxially arranged with the worm gear 215. The first sprocket 216 is arranged on the worm gear 215 and is coaxially arranged with the worm gear 215. The first sprocket 216 is drivingly connected to the second sprocket 217 through a chain 218. The second sprocket 217 is connected to the operating shaft 4 and is coaxially arranged with the operating shaft 4. Thus, driven by the motor 211, the worm 214 can be driven to rotate through the meshing of the first bevel gear 212 and the second bevel gear 213. When the worm 214 rotates, the worm gear 215 can be driven to rotate. Since the worm gear 215 is coaxially arranged with the transmission shaft 22, the first transmission assembly 35 and the second transmission assembly 36 can be driven to act through the transmission shaft 22. And the second sprocket 217 is drivingly connected to the first sprocket 216 arranged on the worm gear 215 through a chain 218. Therefore, when the worm gear 215 rotates, the second sprocket 217 can be driven to rotate through the chain 218, and then the operating shaft 4 can be driven to rotate. Finally, the operating shaft 4 drives the earthing switch 5 to open and close.

[0120] Preferably, the insulating platform 31 of the present application is provided with a static earthing end and a groove for installing spring fingers, and is slidably connected to the moving contact of the earthing switch 5, thereby forming a composite earthing switch 5 structure.

[0121] Preferably, guide rings are installed on both sides of the first moving contact 33 and the second moving contact 34. A plurality of sliding grooves are formed in the first moving cavity and the second moving cavity. The guide ring of the first moving contact 33 is slidably engaged with the sliding groove in the first moving cavity, which can ensure that the first moving contact 33 can be accurately docked with the first static contact 37 during the sliding process of the first moving contact 33.

[0122] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-break disconnecting switch, characterized in that, Comprising: A housing, a plurality of double-break switch devices, and a plurality of drive mechanisms; A plurality of cavities are formed in the housing; The double-break switch devices are provided in the plurality of cavities; The double-break switch device includes an insulating platform, a moving contact seat, a first moving contact, a second moving contact, a first transmission assembly, a second transmission assembly, a first static contact, and a second static contact; The first static contact and the second static contact are both arranged in the cavity; The moving contact seat is fixed in the cavity through the insulating platform; The moving contact seat has a first extending end and a second extending end, and a first moving cavity for the first moving contact to move is formed in the first extending end; A second moving cavity for the second moving contact to move is formed in the second extending end; The drive mechanism is used to drive the first transmission assembly to drive the first moving contact to extend from the first moving cavity to contact the first static contact, and drive the second transmission assembly to drive the second moving contact to extend from the second moving cavity to contact the second static contact, or drive the first transmission assembly to drive the first moving contact to separate from the first static contact, and drive the second transmission assembly to drive the second moving contact to separate from the second static contact, so as to realize synchronous closing or opening of the double-break switch devices in the plurality of cavities.

2. The double-break disconnecting switch according to claim 1, characterized in that, The first moving cavity is coaxially arranged with the first static contact; The second moving cavity is coaxially arranged with the second static contact.

3. The double-break disconnecting switch according to claim 1, characterized in that, The cavity includes a first channel and a second channel; The first channel is formed along the vertical direction of the housing; The second channel is formed along the horizontal direction of the housing, and the second channel communicates with the lower end of the first channel; The first end of the moving contact seat is arranged in the first channel, and the second end is arranged in the second channel; The first static contact is arranged at the second end of the first channel; The second static contact is arranged at the first end of the second channel.

4. The double-break disconnecting switch according to claim 3, characterized in that, The drive mechanism includes: a power mechanism and a transmission shaft; A channel for the transmission shaft to pass through is formed in the housing, and the channel communicates with the plurality of cavities; The transmission shaft is rotatably arranged in the channel; One end of the transmission shaft is in transmission connection with the power mechanism, and the power mechanism drives the first transmission assembly and the second transmission assembly in the plurality of cavities to act simultaneously through the transmission shaft.

5. The double-break disconnecting switch according to claim 4, characterized in that, The first transmission assembly is the same as the second transmission assembly; The first transmission assembly includes: a driven gear, a transmission gear, a transmission screw rod, a bearing, and a transmission nut; The transmission screw rod is arranged in the first moving cavity through the bearing; The driven gear is arranged on the transmission shaft; The transmission gear is arranged at the first end of the transmission screw rod and meshes with the driven gear; A receiving cavity for the transmission screw rod to extend into is formed at the first end of the first moving contact; The transmission nut is arranged at the first end of the first moving contact; The transmission screw rod is in threaded cooperation with the transmission nut.

6. The double-break disconnecting switch according to claim 4, characterized in that, The transmission shaft is composed of a first sub-transmission shaft and a plurality of second sub-transmission shafts; One end of the first sub-drive shaft is in transmission connection with the power mechanism, and the other end is in transmission connection with another second sub-drive shaft through one of the second sub-drive shafts, wherein the second sub-drive shaft is arranged between adjacent cavities; Both the first sub-drive shaft and the second sub-drive shaft are insulated and each includes an insulating tube and a joint, wherein joints are provided at both ends of the insulating tube.

7. The double-break disconnecting switch according to claim 6, characterized in that, The insulating tube is made of vacuum-impregnated epoxy glass cloth, and / or the joint is made of aluminum alloy.

8. The double-break disconnecting switch according to claim 4, characterized in that, It further includes: an operating shaft and a plurality of earthing switches arranged outside the housing, wherein the number of the earthing switches corresponds to the number of the cavities; The power mechanism also drives the plurality of earthing switches to open and close synchronously through the operating shaft.

9. The double-break disconnecting switch according to claim 8, wherein The operating shaft includes: a first connecting shaft and a plurality of second connecting shafts; One end of the first connecting shaft is in transmission connection with the power mechanism, and the other end is in transmission connection with another second connecting shaft through one of the second connecting shafts, wherein the second connecting shaft is arranged between adjacent earthing switches.

10. The double-break disconnecting switch according to claim 8, characterized in that, The power mechanism includes: a motor, a first bevel gear, a second bevel gear, a worm, a worm gear, a first sprocket, a second sprocket and a chain; The first bevel gear is arranged on the rotating shaft of the motor; The second bevel gear is arranged at one end of the worm and meshes with the first bevel gear; The worm meshes with the worm gear; The drive shaft is connected to the worm gear and is coaxially arranged with the worm gear; The first sprocket is arranged on the worm gear and is coaxially arranged with the worm gear; The first sprocket is in transmission connection with the second sprocket through the chain; The second sprocket is connected to the operating shaft and is coaxially arranged with the operating shaft.

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