CN116741565A - Three-station isolating switch device and inflatable cabinet - Google Patents

Abstract

The invention discloses a three-station isolating switch device and an inflatable cabinet, comprising: a disconnecting switch and an operating unit. The isolating switch and the operating unit are both arranged on the side plate of the air box, the isolating switch is positioned in the air box, and the operating unit is positioned on the outer side of the air box. The isolating switch is provided with a closing position, a separating position and a grounding position. The isolating switch comprises a plurality of moving contacts and a transmission unit, and the transmission unit is connected with the moving contacts. The operation unit is provided with a transmission shaft, the transmission shaft penetrates through the side plate and is connected with the transmission unit and used for driving the transmission unit to drive the plurality of moving contacts to synchronously rotate among a closing position, a separating brake position and a grounding position, and then the isolating switch is controlled to switch among closing, separating brake or grounding states. The three-station isolating switch device can reduce the air leakage risk and the production cost.

Description

Three-station isolating switch device and inflatable cabinet

Technical Field

The invention particularly relates to a three-station isolating switch device and an inflatable cabinet comprising the same.

Background

With the development of the power industry, the inflatable cabinets are increasingly applied, and the three-station isolating switch and the circuit breaker are used as main components of the inflatable cabinets, so that the importance of the function of the three-station isolating switch and the circuit breaker is self-evident.

The three-station isolating switch and the circuit breaker in the market at present are generally divided into three schemes, wherein the first scheme is a conventional split type, namely the three-station isolating switch is arranged in one gas tank, the circuit breaker is arranged in the other gas tank, and the scheme has higher cost; the second type is a direct-acting three-station disconnecting switch which is integrated with a breaker, the three-station disconnecting switch is arranged in an air box of the inflatable cabinet, and a disconnecting switch operating mechanism is arranged outside the air box. The isolating switch operating mechanism is connected with the three-station switch through a plurality of screw rods, the screw rods are required to penetrate through the side wall of the air box, so that the air box is easy to leak air, the probability of air leakage of the air box is gradually increased along with the abrasion of the screw rods, and in addition, the copper part consumption of the scheme is more, and the cost is higher; the third is that the lead screw drives the switch formula all-in-one, also because needs a plurality of lead screws to run through in the gas tank lateral wall, has increased the probability that the gas tank leaked gas to the contact in this scheme is the slice, can't improve the current-carrying capacity.

In summary, the existing three-station isolating switch device mainly has the problems of high air leakage risk, high cost and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing a three-station isolating switch device and an air charging cabinet aiming at the defects in the prior art, and the device can reduce the production cost while reducing the air leakage risk.

According to an embodiment of the first aspect of the present invention, there is provided a three-position disconnecting switch device comprising: a disconnecting switch and an operating unit. The isolating switch and the operating unit are both arranged on the side plate of the air box, the isolating switch is positioned in the air box, and the operating unit is positioned on the outer side of the air box. The isolating switch is provided with a closing position, a separating position and a grounding position. The isolating switch comprises a plurality of moving contacts and a transmission unit, and the transmission unit is connected with the moving contacts. The operation unit is provided with a transmission shaft, the transmission shaft penetrates through the side plate and is connected with the transmission unit, and the transmission shaft is used for driving the transmission unit to drive the plurality of moving contacts to synchronously rotate among a closing position, a separating brake position and a grounding position, so that the isolating switch is controlled to switch among closing, separating brake or grounding states.

Preferably, the device further comprises a circuit breaker, wherein the circuit breaker is arranged on the side plate and is positioned outside the air box. The isolating switch further comprises a grounding contact and a switching contact, wherein the grounding contact is located at the grounding position, the switching contact is located at the switching-on position, and the switching-off position is located between the grounding position and the switching-on position. The moving contact and the switching contact are electrically connected to a main circuit to be controlled, and the grounding contact is electrically connected to the circuit breaker. When the moving contact rotates to the closing position, the moving contact can be contacted with the closing contact, so that the main loop is conducted. When the moving contact rotates to the opening position, the main loop can be disconnected. When the moving contact rotates to the grounding position, the moving contact can be contacted with the grounding contact, so that the main loop is in a grounding state.

Preferably, the number of the switch-on contacts and the ground contacts is also plural, and both the number of the switch-on contacts and the ground contacts are the same as the number of the moving contacts. The plurality of the switch-on contacts, the plurality of the grounding contacts and the plurality of the moving contacts are all arranged side by side, and each moving contact is aligned with one switch-on contact and one grounding contact, so that the moving contacts can be contacted with the switch-on contacts and the grounding contacts in the rotating process.

Preferably, the device further comprises a plurality of sealing poles arranged side by side, and a plurality of sealing poles are positioned in the air box and mounted on the side plates. The upper side of each solid-sealed polar pole is provided with a static contact seat and a movable contact seat, the static contact seat is electrically connected with the circuit breaker, and the grounding contact is arranged on the static contact seat and is electrically connected with the circuit breaker through the static contact seat. The movable contact is rotatably connected to the movable contact seat.

Preferably, the solid-sealed polar pole comprises a pole main body, the pole main body is mounted on the side plate, and the static contact seat and the movable contact seat are both mounted on the pole main body. The inside vacuum interrupter that is equipped with of utmost point post main part, the static contact seat passes through vacuum interrupter with the circuit breaker electricity is connected.

Preferably, the device further comprises a plurality of insulators, the number of the insulators is the same as that of the switch-on contacts, and the switch-on contacts are arranged on the side plates through the insulators.

Preferably, the transmission unit comprises a rotating shaft, a swinging rod piece and a bevel gear set. The rotating shaft is horizontally arranged, and the extending direction of the central axis of the rotating shaft is parallel to the arrangement direction of the moving contacts. The number of the swinging rod pieces is the same as that of the moving contacts, one ends of the swinging rod pieces are connected with the rotating shaft, and the other ends of the swinging rod pieces are respectively connected with the moving contacts. One end of the bevel gear set is connected with the transmission shaft of the operation unit, and the other end of the bevel gear set is connected with the rotating shaft. The transmission shaft is used for driving the rotating shaft to rotate along the axis of the transmission shaft through the bevel gear group so as to drive the swinging rod piece to swing, and further drive the moving contact to rotate among a closing position, a separating position and a grounding position.

Preferably, the bevel gear set includes a first bevel gear and a second bevel gear. The first bevel gear is arranged on the transmission shaft, the second bevel gear is arranged on the rotating shaft, and the central axis of the first bevel gear is perpendicular to the central axis of the second bevel gear. The first bevel gear and the second bevel gear are in meshed transmission, and the transmission shaft drives the first bevel gear to rotate so as to drive the second bevel gear and the rotating shaft to rotate.

Preferably, the operation unit includes a controller and a motor. An output shaft of the motor is connected with the transmission shaft. The controller is electrically connected to the motor and used for controlling the steering of an output shaft of the motor so as to control the swinging direction of the moving contact.

According to an embodiment of the second aspect of the present invention, there is also provided an inflatable cabinet, including a cabinet body and the three-position disconnecting switch device described above. The air box is accommodated in the cabinet body, the three-station isolating switch device is installed on a side plate of the air box, and the isolating switch of the three-station isolating switch device is accommodated in the air box. The air box is filled with insulating gas for isolating the isolating switch from the outside.

According to the three-station isolating switch device, the transmission unit can be driven through the operation unit, so that the plurality of moving contacts are driven to synchronously rotate among the switching-on position, the switching-off position and the grounding position, and the isolating switch is controlled to be switched among the switching-on state, the switching-off state or the grounding state. In the prior art, the operating mechanism needs to control the rotation of the brake contacts respectively through a plurality of screw rods, and the switch device can control the rotation of a plurality of movable contacts only by one transmission shaft, so that the generation cost can be reduced. In addition, the switch device does not need to be provided with a plurality of through holes, so that the risk of air leakage can be reduced. Therefore, the switch device can reduce the production cost while reducing the air leakage risk.

Drawings

FIG. 1 is a schematic diagram of a three-position disconnector arrangement in some embodiments of the invention;

fig. 2 is a side view of a three-position disconnector arrangement in some embodiments of the invention.

In the figure: the device comprises a 1-side plate, a 2-connection contact, a 3-insulator, a 4-swinging rod piece, a 41-pull rod, a 42-crank arm, a 5-operation unit, a 51-transmission shaft, a 6-rotating shaft, a 7-moving contact, an 8-circuit breaker, a 9-grounding contact, a 10-solid sealing pole and an 11-bevel gear set.

Detailed Description

The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

In the description of the present invention, it should be noted that, the terms "upper", "lower", "upstream", "downstream", and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience and simplicity of description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

Example 1

Referring to fig. 1 and 2, the present invention discloses a three-position disconnecting switch device, which comprises a disconnecting switch and an operating unit 5.

Wherein, isolator and operating unit 5 are all installed on the curb plate 1 of gas tank, and isolator is located the gas tank, and operating unit 5 is located the gas tank outside. The isolating switch is provided with a closing position, a separating position and a grounding position. The isolating switch comprises a plurality of moving contacts 7 and a transmission unit, and the transmission unit is connected with the moving contacts 7. The operation unit 5 is provided with a transmission shaft 51, the transmission shaft 51 penetrates through the side plate 1 and is connected with the transmission unit, and the transmission shaft is used for driving the transmission unit to drive the plurality of moving contacts 7 to synchronously rotate among a closing position, a separating brake position and a grounding position, so as to control the isolating switch to switch among closing, separating brake or grounding states.

Specifically, the air box is formed by welding a plurality of aluminum plates, and the thickness of the side plate 1 is 3-5 mm. The gas tank is filled with insulating gas, such as SF6, for protecting important components, such as a disconnecting switch and a control circuit, located therein from moisture or salt and alkali attack. Therefore, in order to improve the insulating effect of the insulating gas, it is necessary to ensure the sealability of the gas tank.

At present, three-station isolating switches and circuit breaker all-in-one machines are connected through screw transmission, and one screw structure corresponds to one moving contact, so that a plurality of moving contacts are required to be controlled through a plurality of screws respectively. Because a plurality of lead screws all need run through the curb plate of gas tank, lead to the gas tank to leak gas easily, moreover, the lead screw can produce wearing and tearing in long-term use for the probability of gas tank gas leakage increases progressively.

In this embodiment, the isolating switch drives the transmission unit only through one transmission shaft 51, and further drives the plurality of moving contacts 7 to rotate, so that the risk of air leakage of the air box can be greatly reduced. The operation unit 5 drives the transmission unit through the transmission shaft 51 to drive the plurality of moving contacts 7 to synchronously rotate among the closing position, the opening position and the grounding position, so that the isolating switch can be controlled to switch among the closing state, the opening state or the grounding state.

Further, a through hole is formed in the side plate 1 for the transmission shaft 51 to pass through. In order to avoid leakage of insulating gas caused by a gap between the transmission shaft 51 and the through hole of the side plate 1, a magnetic fluid sealing unit is provided in the through hole. The magnetic fluid sealing unit comprises a bearing, magnetic fluid and a permanent magnet, and the transmission shaft penetrates through the bearing. Under the action of the stable magnetic field generated by the permanent magnet, the magnetic fluid is filled in the gap in the bearing to form an O-shaped sealing ring, and the gap in the bearing is blocked, so that the sealing effect is achieved. In particular, the magnetic fluid sealing unit may employ commercially available equipment.

Specifically, the operation unit 5 includes a controller and a motor. An output shaft of the motor is connected with the transmission shaft 51, and the controller is electrically connected with the motor and is used for controlling the steering of the output shaft of the motor and further controlling the swinging direction of the brake contact 7. As shown in fig. 2, when the moving contact 7 in the opening position rotates in the clockwise direction, it can be switched to the closing position; when rotated in the counterclockwise direction, it is possible to switch to the ground position.

Therefore, the three-station isolating switch device can automatically adjust the closing, opening and grounding states of the main loop, and simultaneously can reduce the risk of air leakage and reduce the production cost.

Referring to fig. 1, in the present embodiment, the three-position disconnecting switch device further includes a circuit breaker 8. The circuit breaker 8 is mounted on the side plate 1, which is located outside the gas tank. The disconnector further comprises a ground contact 9 and a contact-on contact 2, the ground contact 9 being in a ground position, the contact-on contact 2 being in a contact-on position, and the switch-off position being between the ground position and the contact-on position.

The moving contact 7 and the closing contact 2 are both electrically connected in the main circuit to be controlled, and the ground contact 9 is electrically connected to the circuit breaker 8. When the moving contact 7 rotates to the closing position, the moving contact can contact with the closing contact 2, so that the main circuit is conducted. When the movable contact 7 rotates to the opening position, it is in a state of not contacting with other contacts, and thus the main circuit can be disconnected. When the movable contact 7 of the isolating switch rotates to the grounding position, the movable contact can be contacted with the grounding contact 9, so that the main loop is in a grounding state.

Further, the number of the on contacts 2 and the ground contacts 9 is also plural, and both are the same as the number of the moving contacts 7. The plurality of contact contacts 2, the plurality of ground contacts 9 and the plurality of moving contacts 7 are all arranged side by side, and each moving contact 7 is aligned with one contact 2 and one ground contact 9, so that the moving contact 7 can be in contact with the contact contacts and the ground contacts during rotation.

Furthermore, the moving contact 7 adopts a contact finger structure, so that the current-carrying capacity of the isolating switch can be improved.

In this embodiment, the three-position disconnecting switch device further comprises a plurality of solid-sealed polar poles 10 arranged side by side. A plurality of solid sealed poles 10 are positioned inside the gas tank and mounted on the side plate 1. The upper side of each solid-sealed polar pole 10 is provided with a static contact seat and a movable contact seat, the static contact seat is electrically connected with the circuit breaker 8, and the grounding contact 9 is arranged on the static contact seat and is electrically connected with the circuit breaker 8 through the static contact seat. The movable contact 7 is rotatably connected to the movable contact seat.

The solid-sealed pole 10 includes a pole body, the pole body is mounted on the side plate 1, and the static contact seat and the movable contact seat are both mounted on the pole body. The inside vacuum interrupter that is equipped with of utmost point post main part, the static contact seat passes through vacuum interrupter and is connected with circuit breaker 8 electricity. The pole body penetrates through the side plate 1, and a sealing ring is arranged between the pole body and a gap of the side plate 1 so as to avoid leakage of insulating gas in the gas tank.

In addition, the three-station isolating switch device further comprises a plurality of insulators 3, the number of the insulators 3 is the same as that of the switching-on contacts 2, and the switching-on contacts 2 are arranged on the side plates 1 through the insulators 3. Preferably, the insulator 3 is made of epoxy resin material, so that electrification of the air box side plate 1 caused by electric leakage of the contact 2 can be effectively avoided.

Specifically, the grounding contact 9 and the moving contact 7 of the isolating switch are both installed on the solid-sealed polar pole 10, and the connecting contact 2 is installed on the side plate 1 through the insulator 3, so that the isolating switch and the circuit breaker 8 are assembled into an integrated machine, and the installation space can be saved and the cost can be reduced.

Referring to fig. 1 and 2, in the present embodiment, the transmission unit includes a rotation shaft 6, a swing link 4, and a bevel gear set 11. Specifically, the rotating shaft 6, the swinging rod 4 and the bevel gear set 11 are all installed on the solid-sealed pole 10. The rotating shaft 6 is horizontally arranged, and the extending direction of the central axis of the rotating shaft is parallel to the arrangement direction of the plurality of moving contacts. The number of the swinging rod pieces 4 is the same as that of the moving contacts, one ends of the swinging rod pieces 4 are connected with the rotating shaft 6, and the other ends of the swinging rod pieces 4 are respectively connected with the moving contacts. One end of the bevel gear set 11 is connected with a transmission shaft 51 of the operation unit 5, and the other end is connected with the rotation shaft 6. The transmission shaft 51 is used for driving the rotation shaft 6 to rotate along the axis of the transmission shaft through the bevel gear set 11 so as to drive the swinging rod piece 4 to swing, and further drive the moving contact to rotate among a closing position, a separating position and a grounding position.

Specifically, the swinging rod 4 includes a lever 42 and a pull rod 41, one end of the lever 42 is rotatably connected to the rotating shaft 6, the other end is rotatably connected to the pull rod 41, and the pull rod 41 is rotatably connected to the moving contact 7. As shown in fig. 2, when the rotating shaft 6 rotates clockwise, the moving contact 7 can be driven to rotate clockwise by the crank arm 42 and the pull rod 41, so that the moving contact 7 contacts with the switch-on contact 2, and the main circuit is conducted. When the rotating shaft 6 rotates in the anticlockwise direction, the moving contact 7 can be driven to rotate in the anticlockwise direction through the crank arm 42 and the pull rod 41, so that the moving contact 7 is in contact with the grounding contact 9, and further the cable side of the main loop is grounded.

Further, the bevel gear group 11 includes a first bevel gear and a second bevel gear. The first bevel gear is installed on the transmission shaft 51, the second bevel gear is installed on the rotating shaft 6, and the central axis of the first bevel gear is perpendicular to the central axis of the second bevel gear. The first bevel gear and the second bevel gear are meshed for transmission, and the transmission shaft 51 drives the first bevel gear to rotate, so that the second bevel gear and the rotating shaft 6 are driven to rotate.

Preferably, the transmission shaft 51, the rotating shaft 6, the first bevel gear and the second bevel gear are all made of stainless steel materials, so that the wear-resisting performance is good, and abrasion is not easy to generate.

It should be noted that, in the prior art, the plurality of screws respectively drive the plurality of moving contacts, and as each screw and the moving contact are independent, transmission errors occur between the plurality of screws after long-time use, so that the moving contacts cannot synchronously rotate. The switch device drives the plurality of crank arms 42 and the pull rod 41 through the rotating shaft 6, and further drives the plurality of moving contacts 7 to rotate, so that the switch device can always keep the plurality of moving contacts 7 to synchronously rotate.

The working process of the three-station isolating switch device is as follows: the operation unit 5 drives the crank arm 42 to rotate through the rotating shaft 6 and the bevel gear set 11, so that the insulation pull rod 41 drives the movable contact 7 arranged on the solid-sealed pole 10 to rotate, when the movable contact is rotated to be in contact with the contact-on contact 2, the main loop on state of the whole switch is realized, when the movable contact is rotated to be in contact with the grounding contact 9, the cable grounding state is realized, when the movable contact is rotated to be in a middle position, the movable contact is not in contact with the contact-on contact 2 nor in contact with the grounding contact 9, and the main loop off state is realized.

In summary, the three-station isolating switch device has the following advantages: the whole structure is simple, the use of spare parts can be reduced, and the isolating switch is arranged on the solid sealing pole 10 and the sealing aluminum plate of the circuit breaker 8 and is assembled with the circuit breaker 8 into a whole, so that the assembling efficiency is improved, and the risk and the cost of air leakage are reduced.

Example 2

The invention also discloses an inflatable cabinet, which comprises a cabinet body, an air box and the three-station isolating switch device in the embodiment 1.

Wherein, the gas tank holding is internal in the cabinet, and three station isolator installs on the curb plate 1 of gas tank, and three station isolator device's isolator holding is in the gas tank, is full of insulating gas in the gas tank for with isolator and external isolation.

The inflatable cabinet is particularly suitable for devices such as a secondary substation, an opening and closing station, a box-type substation and the like of a power system, and is particularly suitable for occasions with high power requirements such as airports, subways and railways.

The inflatable cabinet adopts an air tank which is insulated by air and is filled with sulfur hexafluoride gas, and the air tank is a metal closed tank body so as to avoid leakage of insulating gas therein. This cabinet of aerifing through adopting the three station isolator device in embodiment 1, can reduce the opening on the gas tank curb plate 1 to reduce the gas leakage risk.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (10)

1. A three-position disconnector arrangement comprising: a disconnecting switch and an operating unit (5);

the isolating switch and the operating unit (5) are both arranged on a side plate (1) of the air box, the isolating switch is positioned in the air box, and the operating unit (5) is positioned at the outer side of the air box;

the isolating switch is provided with a closing position, a separating position and a grounding position;

the isolating switch comprises a plurality of moving contacts (7) and a transmission unit, wherein the transmission unit is connected with the moving contacts (7);

the operation unit (5) is provided with a transmission shaft (51), and the transmission shaft penetrates through the side plate (1) and is connected with the transmission unit to drive the transmission unit so as to drive the plurality of moving contacts (7) to synchronously rotate among a closing position, a separating brake position and a grounding position, and further control the isolating switch to switch among closing, separating brake or grounding states.

2. The device according to claim 1, further comprising a circuit breaker (8), said circuit breaker (8) being mounted on said side plate (1), outside said gas tank;

the isolating switch further comprises a grounding contact (9) and a switching-on contact (2), wherein the grounding contact (9) is positioned at the grounding position, the switching-on contact (2) is positioned at the switching-on position, and the switching-off position is positioned between the grounding position and the switching-on position;

the moving contact (7) and the switching contact (2) are electrically connected to a main circuit to be controlled, and the grounding contact (9) is electrically connected to the circuit breaker (8);

when the moving contact (7) rotates to the closing position, the moving contact can be contacted with the closing contact (2) so as to conduct the main loop;

when the movable contact (7) rotates to the opening position, the main loop can be disconnected;

when the movable contact (7) rotates to the grounding position, the movable contact can be contacted with the grounding contact (9), so that the main loop is in a grounding state.

3. The device according to claim 2, characterized in that the number of the contact-making contacts (2) and the ground contacts (9) is also plural and both are the same as the number of the moving contacts (7),

the plurality of the switch-on contacts (2), the plurality of the grounding contacts (9) and the plurality of the moving contacts (7) are arranged side by side, and each moving contact (7) is aligned with one switch-on contact (2) and one grounding contact (9), so that the moving contact (7) can be contacted with the switch-on contact (2) and the grounding contact (9) in the rotating process.

4. A device according to claim 3, further comprising a plurality of solid sealed poles (10) arranged side by side, a plurality of said solid sealed poles (10) being located inside said gas tank and mounted on said side plates (1);

the upper side of each solid-sealed polar pole (10) is provided with a static contact seat and a movable contact seat, the static contact seat is electrically connected with the circuit breaker (8), and the grounding contact (9) is arranged on the static contact seat and is electrically connected with the circuit breaker (8) through the static contact seat; the movable contact (7) is rotatably connected to the movable contact seat.

5. The device according to claim 4, wherein the solid sealed pole (10) comprises a pole body mounted on the side plate (1), the stationary contact seat and the moving contact (7) seat are both mounted on the pole body,

the inside vacuum interrupter that is equipped with of utmost point post main part, the static contact seat passes through vacuum interrupter with circuit breaker (8) electricity is connected.

6. A device according to claim 3, further comprising a plurality of insulators (3), the number of insulators (3) being the same as the number of contact-making contacts (2), the contact-making contacts (2) being mounted on the side plate (1) by means of the insulators (3).

7. The device according to claim 1, characterized in that the transmission unit comprises a rotation shaft (6), a swinging rod (4) and a bevel gear set (11);

the rotating shaft (6) is horizontally arranged, the extending direction of the central axis of the rotating shaft is parallel to the arrangement direction of the plurality of moving contacts (7),

the number of the swinging rod pieces (4) is the same as that of the moving contacts (7), one ends of the swinging rod pieces (4) are connected with the rotating shaft (6), the other ends of the swinging rod pieces are respectively connected with the moving contacts (7),

one end of the bevel gear group (11) is connected with a transmission shaft of the operation unit (5), the other end is connected with the rotating shaft (6),

the transmission shaft (51) is used for driving the rotating shaft (6) to rotate along the axis of the transmission shaft through the bevel gear set (11) so as to drive the swinging rod piece (4) to swing, and further drive the moving contact (7) to rotate among a closing position, a separating position and a grounding position.

8. The device according to claim 7, characterized in that the bevel gear set (11) comprises a first bevel gear and a second bevel gear,

the first bevel gear is arranged on the transmission shaft, the second bevel gear is arranged on the rotating shaft (6), and the central axis of the first bevel gear is perpendicular to the central axis of the second bevel gear;

the first bevel gear and the second bevel gear are in meshed transmission, and the transmission shaft drives the first bevel gear to rotate so as to drive the second bevel gear and the rotating shaft (6) to rotate.

9. The device according to claim 1, characterized in that the operating unit (5) comprises a controller and a motor;

an output shaft of the motor is connected with the transmission shaft,

the controller is electrically connected to the motor and used for controlling the steering of an output shaft of the motor so as to control the swinging direction of the moving contact (7).

10. An inflatable cabinet, comprising a cabinet body, an air box, and the three-position disconnecting switch device according to any one of claims 1-9;

the three-station isolating switch device is arranged on a side plate (1) of the air box, the isolating switch of the three-station isolating switch device is arranged in the air box, and the air box is filled with insulating gas for isolating the isolating switch from the outside.