CN115347495A

CN115347495A - Environment-friendly gas-insulated vacuum-opening-closing power distribution switch cabinet

Info

Publication number: CN115347495A
Application number: CN202211015785.0A
Authority: CN
Inventors: 王东
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-11-15

Abstract

The invention relates to an environment-friendly gas-insulated vacuum switching distribution switch cabinet, which comprises a sealed air chamber, a cable chamber and a mechanism control chamber, wherein the sealed air chamber is provided with a gas inlet and a gas outlet; the sealed gas chamber comprises a gas tank and a three-phase load switch or an isolation breaker combination, and the gas tank is of a full-sealed structure and is filled with environment-friendly insulating gas; the load switch or the isolation breaker combination is formed by connecting a vacuum switching unit and a three-station switch in series; the mechanism control chamber comprises an operating mechanism for electrical and mechanical control and interlocking; the operating mechanism controls the on/off of the vacuum switch unit in a crank arm guide rod driving mode, controls the on/off of the three-position switch in a gear and rack transmission mode, and realizes the combined on/off and grounding operations of the load switch or the isolating circuit breaker in a matching mode of the crank arm guide rod driving mode and the gear and rack transmission mode. The vacuum switch has the beneficial effects of simple structure, convenience in operation and low cost based on environment-friendly gas insulation and vacuum switching.

Description

Environment-friendly gas-insulated vacuum-opened and closed power distribution switch cabinet

[ technical field ] A

The invention relates to the technical field of distribution electric appliances, in particular to an environment-friendly gas-insulated vacuum-switching distribution switch cabinet.

[ background ] A method for producing a semiconductor device

The widely used distribution switch (cabinet) at present comprises a load switch (cabinet), a combined electrical appliance (cabinet), a circuit breaker (cabinet) and the like, and in order to improve the insulation and breaking performance, SF is mostly adopted ₆ (Sulfur hexafluoride) gas as insulating and breaking medium, using SF ₆ The high-voltage switch cabinet has excellent insulation and arc extinguishing performance, adopts a full-sealed and full-insulated mode, ensures that insulation and disconnection are not influenced by the environment, has small volume and simple installation and use, and is economical and practical compared with a conventional switch cabinet, thereby being widely applied to a medium-voltage power distribution system and a user side. But SF ₆ Is an artificial synthetic gas with strong greenhouse effect, and the greenhouse effect is about CO ₂ 23900 times of carbon dioxide, and is difficult to participate in natural circulation, and has a long shelf life of 3200 years, and has serious consequences in long-term use and discharge.

For this reason, efforts are being made worldwide to find SF ₆ But this goal has not been ideal to date; meanwhile, other solutions are actively carried out, such as solid insulation, normal-pressure air insulation load switches (cabinets) and the like, and like environment-friendly gas insulation gas-filled cabinets, technical routes and structural modes of nitrogen, dry air or other environment-friendly gas insulation and vacuum opening and closing units are adopted, which are applied to a certain extent but bring other problems, for example, epoxy resin adopted by the solid insulation cabinets is a material which is difficult to degrade, and the treatment and degradation of waste epoxy resin after a large amount of use can become an environment-friendly problem; the normal-pressure air insulation is not fully sealed insulation actually, and can still be affected by condensation and atmospheric pollution to different degrees after long-term operation; although the mode of the environmental protection gas insulation and vacuum switching unit has rationality, the current structure generally adopts the structural mode of a breaker cabinet of the SF6 gas insulation and vacuum switching unit, namely, an isolating switch (or a three-position switch) adopts a knife switch mode, and is independently separated from the vacuum switching unit, an operating mechanism is respectively equipped, so that the structure of a load switch (cabinet) is like the breaker (cabinet), even the breaker (cabinet) is used as the load switch (cabinet), and the isolating switch (or the three-position switch) generally adopts the knife switch mode, thereby being not beneficial to the optimization of an electric field and reducing the volumeAnd the improvement of the dynamic and thermal tolerance level is not facilitated, so that the structure and the function are repeated, the operation is complex, the cost is high, and the popularization and the application of the power distribution and new energy fields are influenced.

The invention relates to an environment-friendly gas insulation and vacuum switching technology, which makes technical improvement on a power distribution switch cabinet.

[ summary of the invention ]

The invention aims to provide a power distribution switch cabinet based on environment-friendly gas insulation and vacuum opening and closing, which is simple in structure, convenient to operate and low in cost.

In order to achieve the purpose, the technical scheme adopted by the invention is that the environment-friendly gas-insulated vacuum switching power distribution switch cabinet comprises a sealed gas chamber, a cable chamber and a mechanism control chamber; the sealed air chamber comprises an air box, a pressure relief device arranged outside the air box, and a three-phase load switch or an isolation circuit breaker combination arranged in the air box, wherein the air box is of a full-sealed structure and is filled with environment-friendly insulating gas; the load switch or the isolation breaker combination is formed by connecting a vacuum switching unit and a three-station switch in series; the cable chamber comprises a cable sleeve for cable connection; the mechanism control room comprises an operating mechanism for electrical and mechanical control and interlocking; the three-phase load switch or the isolation breaker combination is connected with the bus through the bus sleeve to realize the expansion of the bus between the cabinets, and is connected with the cable sleeve through the connecting conductor to realize the cable connection; the operating mechanism controls the on/off of the vacuum switch unit in a crank arm guide rod driving mode, controls the on/off of the three-position switch in a gear and rack transmission mode, and realizes the combined on/off and grounding operations of the load switch or the isolating circuit breaker in a matching mode of the crank arm guide rod driving mode and the gear and rack transmission mode.

Preferably, the three-station switch comprises a moving contact, a fixed contact, a grounding fixed contact, a moving contact seat, a gear, a rack, a support frame, a first transmission shaft and a series flexible connection; the vacuum switching unit comprises a vacuum arc extinguish chamber, a second transmission shaft, a driving crank arm, a movable guide rod, a contact pressure spring, an upper support, a middle support, a lower support, a left support plate and a right support plate, wherein the vacuum arc extinguish chamber comprises a vacuum movable contact and a vacuum static contact; the operating mechanism comprises a first output shaft and a second output shaft.

Preferably, the support frame is fixed on a left support plate on the side surface of the vacuum opening and closing unit, one end of the series flexible connection is connected with a movable guide rod of the vacuum opening and closing unit, and the other end of the series flexible connection penetrates through the support plate to be connected with the movable contact base, so that the series connection of the vacuum opening and closing unit and the three-station switch is formed; the movable contact passes through the movable contact seat and the support frame in sequence and is in conductive connection with the movable contact in a sliding electrical contact mode; the rack is embedded in the right side surface of the moving contact, the gear is fixed on the first transmission shaft, one end of the first transmission shaft protrudes out of the air box through a rotary seal and is linked with a first output shaft of the operating mechanism, the other end of the first transmission shaft in the air box penetrates through the support frame to obtain a rotary support, and the three-phase synchronous linkage of the moving contact is realized in the support frame through the engagement of the gear and the rack; the static contact is fixed on the bus, and the grounding static contact is fixed on a first fixed bracket provided with a three-phase short circuit grounding bar and is connected with a grounding system of the gas tank; when the first transmission shaft rotates to drive the gear to rotate clockwise or anticlockwise under the driving of the operating mechanism, the rack is driven and the movable contact is driven to move up and down, so that the three-position switch is switched on and off and grounded, namely, the movable contact is switched on when being inserted into the fixed contact, the movable contact is switched on when being inserted into the grounded fixed contact and grounded, and the movable contact is kept or returns to the middle position.

Preferably, the vacuum moving contact is contacted or separated relative to the vacuum fixed contact to form the on-off of the vacuum arc-extinguishing chamber and the vacuum opening and closing unit; the upper end, the middle end and the lower end of the vacuum arc extinguish chamber are fixed by the upper support, the middle support and the lower support, and two sides of the vacuum arc extinguish chamber are fixed by the left support plate and the right support plate; one end of the series flexible connection is connected with the movable guide rod, the other end of the series flexible connection is connected with the movable contact base of the three-position switch, and the other end of the movable guide rod is connected with the vacuum movable contact in the vacuum arc extinguish chamber; one end of the second transmission shaft protrudes out of the air box through a rotary seal to be linked with a second output shaft of the operating mechanism, and the other end of the second transmission shaft is arranged in the air box and drives the three-phase movable guide rod and the vacuum moving contact to move up and down through the rotary sliding of the pin shafts of the driving crank arm and the movable guide rod so as to realize the opening or closing of the three-phase vacuum arc extinguish chamber.

Preferably, the vacuum switching unit and the three-position switch are driven by the operating mechanism to realize the combined switching-on, switching-off and grounding operations of the load switch or the isolating circuit breaker through the combination, switching-off and grounding of the vacuum moving contact and the moving contact; the moving contact moves upwards to be inserted into the fixed contact to realize connection with a bus under the driving of an operating mechanism, and then the vacuum moving contact is quickly closed to complete the switching-on operation and reach a switching-on state; the vacuum moving contact is quickly separated under the driving of the operating mechanism, and then the moving contact moves downwards to reach an isolation position to complete the brake separating operation and return to a brake separating state; the moving contact continuously moves downwards under the driving of the operating mechanism to insert the grounding fixed contact to be connected with a grounding loop, and then the vacuum moving contact is closed again to finish the grounding operation and reach a grounding state.

Preferably, the moving contact, the fixed contact, the grounding fixed contact and the moving contact seat all adopt cylindrical or cylindrical structures, and the sliding electrical contact modes among the moving contact, the fixed contact, the grounding fixed contact and the moving contact seat are coaxial circular electrical contact modes.

Preferably, the vacuum arc-extinguishing chamber and the movable contact base are fixed in a solid material pouring and sealing mode.

Preferably, the three-position switch is simplified to be used as an isolating switch, the grounding fixed contact and the first fixing support thereof are structurally omitted, and the three-position switch is only switched on and off in function and is switched on and off with the switching on and off of the vacuum switching unit in a switching on and off manner.

Preferably, the bus sleeve is of an inner cone type, is installed in the sealed air chamber, and realizes the connection and expansion of the bus between the switch cabinets through a bus connector on the side surface of the sealed air chamber; or the bus sleeve is of an outer conical shape, is installed outside the sealed air chamber, and is connected and expanded with the insulated bus at the top of the sealed air chamber together with the insulated bus.

The environment-friendly gas-insulated vacuum-switching power distribution switch cabinet has the following beneficial effects: on the basis of an environment-friendly gas insulation and vacuum opening and closing unit and a full-sealed full-insulation mode, the three functions of closing, opening (isolating) and grounding of a load switch cabinet or a breaker cabinet are realized by the series combination of the vacuum opening and closing unit and a three-position switch and the cooperation and transfer of the vacuum opening and closing unit and the three-position switch under the matching drive of a crank arm guide rod driving mode and a gear rack driving mode of an operating mechanism, the vacuum opening and closing unit, the three-position switch and the operating mechanism can be integrated, the environment-friendly gas insulation of the power distribution switch cabinet is realized by fully utilizing the advantages of the vacuum opening and closing, the internal structure and the function combination of the load switch cabinet or the breaker cabinet are simplified, one operating mechanism can be shared, the structure is simplified, the cost is reduced, the operation and the interlocking are simplified, the environment-friendly development of the voltage and current grades and the functions and the application is promoted, and the green development of the power distribution switch cabinet and the power distribution system is promoted.

[ description of the drawings ]

Fig. 1 is a three-dimensional view of an environmentally-friendly gas-insulated vacuum-switching power distribution switchgear.

Fig. 2 is a left side view of the environment-friendly gas-insulated vacuum switching power distribution switchgear with hidden sealed air chamber 1, cable chamber 2 and left side plate of mechanism control chamber 3.

Fig. 3 is a front view of the sealed air chamber behind the left side plate and the rear cover plate of the hidden sealed air chamber of the environment-friendly gas-insulated vacuum switching distribution switch cabinet.

Fig. 4 is a left view of the sealed air chamber behind the hidden sealed air chamber left side plate and the rear cover plate of the environment-friendly gas-insulated vacuum switching power distribution switch cabinet.

Fig. 5 is a rear view of the sealed air chamber behind the left side plate and the rear cover plate of the hidden sealed air chamber of the environment-friendly gas-insulated vacuum switching power distribution switch cabinet.

Fig. 6 is a rear view of an environmentally-friendly gas-insulated vacuum-openable power distribution switchgear with a vacuum opening and closing unit of a concealed sealed gas chamber and a three-position switch connected in series.

Fig. 7 is a schematic diagram of a switching-on state of an environment-friendly gas-insulated vacuum switching power distribution switchgear.

Fig. 8 is a schematic diagram of an open state of an environment-friendly gas-insulated vacuum-opened/closed distribution switchgear.

Fig. 9 is a schematic diagram of a grounding state of an environmental-friendly gas-insulated vacuum switching distribution switchgear.

Reference numerals and components referred to in the drawings are as follows: 1. the device comprises a sealed air chamber, a 2, a cable chamber, a 3, a mechanism control chamber, a 4, a three-phase load switch or an isolation breaker combination, a 5, a bus sleeve, a 6, a cable sleeve, a 7, an operating mechanism, a 8, a connecting conductor, a 9, a vacuum opening and closing unit, a 10, a three-position switch, a 11, an air tank, a 12, a pressure relief device, a 13, a bus, a 14, a movable contact, a 15, a fixed contact, a 16, a grounding fixed contact, a 17, a movable contact seat, a 18, a gear, a 19, a rack, a 20, a support frame, a 21, a series flexible connection, a 22, a left support plate, a 23, a right support plate, a 24, an upper support, a 25, a middle support, a 26, a lower support, a 27, a vacuum arc extinguish chamber, a 27.1, a vacuum movable contact, a 27.2, a vacuum fixed contact, a 28, a second transmission shaft, a 29, a driving crank arm, a 30, a first transmission shaft, a 31, a first fixed support, a lower connecting terminal, a 33, a movable guide rod, a pin shaft, a 37, a first output shaft, a second output shaft, a 39 and a contact pressure spring.

[ detailed description ] A

The invention is further described with reference to the following examples and with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Examples

This embodiment realizes a distribution cubical switchboard that environmental protection gas insulation, vacuum opened and shut.

The embodiment relates to an environment-friendly gas-insulated vacuum-switching power distribution switch cabinet, wherein a load switch or an isolation circuit breaker combination is formed by connecting a vacuum switching unit 9 which is arranged on one side up and down and a three-position switch 10 which is arranged on the other side up and down in series.

Fig. 1 is a three-dimensional view of an environmentally-friendly gas-insulated vacuum-switching power distribution switchgear. As shown in fig. 1, the environment-friendly gas-insulated vacuum-openable and closable distribution switchgear according to the present embodiment is a load switchgear or a breaker cabinet (hereinafter, referred to as a "cabinet"), and includes a sealed gas chamber 1, a cable chamber 2, and a mechanism control chamber 3. Fig. 2 is a left side view of the environment-friendly gas-insulated vacuum switching power distribution switchgear with hidden sealed air chamber 1, cable chamber 2 and left side plate of mechanism control chamber 3. As shown in fig. 2, in the distribution switchgear with environmental protection, gas insulation and vacuum switching in this embodiment, the sealed gas chamber 1 is located at the upper part of the rear of the switchgear and is completely sealed, the sealed gas chamber 1 contains a three-phase load switch or an isolation breaker combination 4 and is filled with environmental protection insulating gas, on the three-phase load switch or the isolation breaker combination 4, a bus 13 is connected through bus sleeves 5 at both sides to expand a bus between the cabinets, the lower part of the three-phase load switch or the isolation breaker combination 4 is connected with a cable sleeve 6 through a connecting conductor 8 to realize cable connection, and the front of the three-phase load switch or the isolation breaker combination 4 is connected with an operating mechanism 7; the cable chamber 2 is arranged at the lower part of the cabinet and comprises a cable sleeve 6 for connecting a cable, and the mechanism control chamber 3 is arranged at the upper front part of the cabinet and comprises an operating mechanism 7 and electric and mechanical control and interlocking devices thereof.

Fig. 3 is a front view of the sealed air chamber behind the left side plate and the rear cover plate of the hidden sealed air chamber of the environment-friendly gas-insulated vacuum switching distribution switch cabinet. Fig. 4 is a left view of the sealed air chamber behind the hidden sealed air chamber and the rear cover plate of the environment-friendly gas-insulated vacuum switching distribution switch cabinet. Fig. 5 is a rear view of the sealed air chamber behind the left side plate and the rear cover plate of the hidden sealed air chamber of the environment-friendly gas-insulated vacuum switching power distribution switch cabinet. As shown in fig. 3, fig. 4, and fig. 5, in the power distribution switchgear with environmental protection gas insulation and vacuum switching according to this embodiment, the sealed gas chamber 1 includes a gas tank 11, a pressure relief device 12 and an operating mechanism 7 installed outside the gas tank 11, a load switch or isolation breaker assembly 4 and a bus 13 and a connecting conductor 8 installed in the gas tank 11, and a fully sealed structure formed by a bus bushing 5 and a cable bushing 6 penetrating through the gas tank 11 and filled with the environmental protection insulating gas, the load switch or isolation breaker assembly 4 is formed by connecting in series the vacuum switching unit 9 arranged vertically on one side and the three-position switch 10 arranged vertically on the other side (or other series connection forms, for example, the three-position switch 10 is connected in series vertically and vertically arranged vacuum switching unit 9, and is matched with the operating mechanism 7 to meet the requirements of the switching on, switching off (isolation) and grounding functions of the load switch or isolation breaker assembly 4, and the load switch or isolation breaker assembly 4 adopts a rear, middle, and front three-phase longitudinal (or other arrangement forms, for example, a horizontal arrangement form, a left-phase gas insulation and right gas insulation type gas environment (for example, a dry environment, etc.), and the environment is friendly nitrogen environment).

Fig. 6 is a rear view of an environmentally-friendly gas-insulated vacuum-openable power distribution switchgear with a vacuum opening and closing unit of a concealed sealed gas chamber and a three-position switch connected in series. As shown in fig. 6, in the distribution switchgear with environmental protection, gas insulation and vacuum switching in this embodiment, the three-position switch 10 includes a moving contact 14, a fixed contact 15, a grounded fixed contact 16, a moving contact 17 and other contact systems, a gear 18, a rack 19, a support frame 20, a first transmission system and a first support system such as a first transmission shaft 30 and other series flexible connection 21, and the like, the support frame 20 is fixed on a left support plate 22 on the side of the vacuum switching unit 9, one end of the series flexible connection 21 is connected to a moving guide 33 of the vacuum switching unit 9, and the other end thereof passes through the support plate 22 and is connected to the moving contact 17, so as to form a series connection between the vacuum switching unit 9 and the three-position switch 10, the moving contact 17 and the conductive connection 21 are installed on the support frame 20, the moving contact 14 sequentially passes through the moving contact 17 and the support frame 20 and forms a conductive connection with the moving contact 17 in a sliding electrical contact manner, the rack 19 is embedded in the right side surface of the movable contact 14, the gear 18 is fixed on the first transmission shaft 30, one end of the first transmission shaft 30 protrudes out of the air tank 11 through a rotary seal and is linked with a first output shaft 37 of the operating mechanism 7, the other end of the first transmission shaft 30 in the air tank 11 penetrates through the support frame 20 to obtain a rotary support, and is engaged with the rack through the gear 18 in the support frame 20 to realize three-phase synchronous linkage of the movable contact 14, the static contact 15 is fixed on the bus 13, the grounding static contact 16 is fixed on a first fixed support 31 provided with a three-phase short circuit grounding bar and is connected with a grounding system of the air tank 11, and when the first transmission shaft 30 rotates to drive the gear 18 to rotate clockwise or counterclockwise under the driving of the operating mechanism 7, the rack 19 is driven and the movable contact 14 is driven to move up and down, so that the three-position switch 10 is switched on (brake), switched off (brake) and grounded (grounded), that is, the movable contact 14 is switched on when inserted into the static contact 15, the movable contact 14 is grounded when inserted into the grounded static contact 16, and the movable contact 14 is kept or returns to the middle position to be switched off; the moving contact 14, the fixed contact 15, the grounding fixed contact 16, the moving contact seat 17 and the like all adopt a cylindrical, cylindrical or combined structure to improve the electric field distribution of the three-position switch 10, and the sliding electrical contact modes among the moving contact and the fixed contact are all coaxial circular electrical contact modes (such as a mode of adopting a watchband contact finger, a spring contact finger or a plum blossom contact) to improve the electrical insulation, electrical contact and peak tolerance (dynamic stability) performances of the three-position switch 10.

As shown in fig. 6, the vacuum switching unit 9 of the present embodiment includes a vacuum arc-extinguishing chamber 27, a vacuum moving contact 27.1 and a vacuum static contact 27.2 contained therein, a second transmission shaft 28, a driving crank 29, a moving guide rod 33, a contact pressure spring 39, and other second transmission systems, and an upper support 24, a middle support 25, a lower support 26, a left support plate 22, and a right support plate 23, wherein the vacuum moving contact 27.1 contacts or separates from the vacuum static contact 27.2 to form a combination and separation of the vacuum arc-extinguishing chamber 27 and the vacuum switching unit 9, the upper, middle, and lower ends of the vacuum arc-extinguishing chamber 27 are fixed by the upper support 24, the middle support, 25, and the lower support 26, the two sides are fixed by the left support plate 22 and the right support plate 23, one end of the series soft connection 21 is connected to the moving guide rod 33, the other end of the second transmission shaft 28 protrudes out of the air tank 11 through a rotary seal to be linked with a second output shaft 38 of the operating mechanism 7, the other end of the second transmission shaft 28 is arranged in the air tank 11 and drives the three-phase movable guide rod 33 and the vacuum movable contact 27.1 to move up and down through a pin 33.1 of the driving crank 29 and the movable guide rod 33 in a rotary sliding manner so as to realize the opening or closing (i.e. opening or closing current) of the three-phase vacuum arc extinguish chamber 27, and the vacuum opening and closing unit 9 can also adopt a solid material pouring (fixing and sealing) mode to fix the vacuum arc extinguish chamber 27 and the movable contact 17 and the like so as to simplify the structure and ensure the mechanical and electrical properties. The vacuum opening and closing unit 9 is fixed in the air box 11 through the left support plate 22 and the right support plate 23 and is led out through a lower wiring end 32.

Fig. 7 is a schematic diagram of a switching-on state of an environment-friendly gas-insulated vacuum switching power distribution switchgear. Fig. 8 is a schematic diagram of an open state of an environment-friendly gas-insulated vacuum-opened/closed distribution switchgear. Fig. 9 is a schematic diagram of an environment-friendly gas-insulated vacuum-opened/closed grounding state of a power distribution switchgear. As shown in fig. 7, 8, and 9, in the distribution switchgear with environmental protection, gas insulation, and vacuum switching according to this embodiment, the vacuum switching unit 9 and the three-position switch 10 are driven by the operating mechanism 7 to implement the switching-on, switching-off (isolating) and grounding operations of the load switch or the isolating breaker assembly 4 through the combination, switching-off and grounding cooperation of the vacuum moving contact 27.1 and the moving contact 14, that is, the moving contact 14 moves upward to insert into the static contact 15 to implement the connection with the bus 13 under the driving of the operating mechanism 7, and then the vacuum moving contact 27.1 is quickly closed to complete the switching-on operation and reach the switching-on state; under the drive of the operating mechanism 7, the vacuum moving contact 27.1 is firstly separated quickly, and then the moving contact 14 firstly moves downwards to reach an isolation position to complete the opening (isolation) operation and return to an opening (isolation) state; the moving contact 14 continues to move downwards under the driving of the operating mechanism 7 to be inserted into the grounding fixed contact 16 to connect a grounding loop, and then the vacuum moving contact 27.1 is closed again to complete the grounding operation and reach a grounding state.

Further, the three-position switch 10 can be simplified to be used as an isolation (two-position) switch, so that the grounding fixed contact 16 and the first fixed support 31 thereof are structurally omitted, and the switching-on and switching-off of the cabinet are realized by the switching-on and switching-off functions of the grounding fixed contact and the first fixed support 31 thereof, and the switching-on and switching-off of the cabinet are realized by the switching-on and switching-off of the vacuum switching-on and switching-off unit 9; the three-position switch 10, the disconnecting switch, and the load switch or the disconnecting device combination 4 may be integrated into a whole or may be formed as a single component (such as an independent three-position switch, a disconnecting switch, a load switch, a disconnecting breaker, etc.) to be applied to other structures or types of switch cabinets, and the gas tank 11 may be made of metal or may be made of an insulating material by casting.

Further, the bus bar sleeve 5 can be of an inner cone type, is installed in the sealed air chamber 1, and is connected and expanded (in a side expanding mode) with a bus bar between switch cabinets through a bus bar connector at the side of the sealed air chamber 1; the bus bar connecting structure can also be in an external conical shape, is arranged outside the sealed air chamber 1, and realizes the connection and expansion of the bus bar between the switch cabinets together with the insulated bus bar at the top of the sealed air chamber 1 (top expansion mode); similarly, the cable sleeve 6 may be an inner cone or an outer cone to meet the requirements of different users and facilitate the connection of cables.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and additions can be made without departing from the principle of the present invention, and these should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a distribution cubical switchboard that environmental protection gas insulation, vacuum opened and shut, includes sealed air chamber, cable chamber and mechanism control room, its characterized in that: the sealed air chamber comprises an air box, a pressure relief device arranged outside the air box, and a three-phase load switch or an isolation circuit breaker combination arranged in the air box, wherein the air box is of a full-sealed structure and is filled with environment-friendly insulating gas; the load switch or the isolation breaker combination is formed by connecting a vacuum switching unit and a three-station switch in series; the cable chamber comprises a cable sleeve for cable connection; the mechanism control chamber comprises an operating mechanism for electrical and mechanical control and interlocking; the gas box is internally provided with a bus, a connecting conductor and a bus sleeve penetrating through the gas box, the three-phase load switch or the isolation breaker combination is connected with the bus through the bus sleeve to realize the expansion of the bus between the cabinets, and the three-phase load switch or the isolation breaker combination is connected with the cable sleeve through the connecting conductor to realize cable connection; the operating mechanism controls the on/off of the vacuum switch unit in a crank arm guide rod driving mode, controls the on/off of the three-position switch in a gear and rack transmission mode, and realizes the combined on/off and grounding operations of the load switch or the isolating circuit breaker in a matching mode of the crank arm guide rod driving mode and the gear and rack transmission mode.

2. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 1, wherein: the three-station switch comprises a moving contact, a fixed contact, a grounding fixed contact, a moving contact base, a gear, a rack, a support frame, a first transmission shaft and a series flexible connection; the vacuum switching unit comprises a vacuum arc extinguish chamber, a second transmission shaft, a driving crank arm, a movable guide rod, a contact pressure spring, an upper support, a middle support, a lower support, a left support plate and a right support plate, wherein the vacuum arc extinguish chamber comprises a vacuum movable contact and a vacuum static contact; the operating mechanism comprises a first output shaft and a second output shaft.

3. The environment-friendly gas-insulated vacuum-switching power distribution switchgear according to claim 2, characterized in that: the support frame is fixed on a left support plate on the side surface of the vacuum opening and closing unit, one end of the series flexible connection is connected with a movable guide rod of the vacuum opening and closing unit, and the other end of the series flexible connection penetrates through the support plate to be connected with the movable contact base, so that the series connection of the vacuum opening and closing unit and the three-station switch is formed; the movable contact seat and the conductive series flexible connection are arranged on the support frame, and the movable contact sequentially penetrates through the movable contact seat and the support frame and is in conductive connection with the movable contact seat in a sliding electrical contact mode; the rack is embedded in the right side face of the moving contact, the gear is fixed on the first transmission shaft, one end of the first transmission shaft protrudes out of the air box through a rotary seal and is linked with a first output shaft of the operating mechanism, the other end of the first transmission shaft in the air box penetrates through the support frame to obtain a rotary support, and the gear is meshed with the rack in the support frame to realize three-phase synchronous linkage of the moving contact; the static contact is fixed on the bus, and the grounding static contact is fixed on a first fixing bracket provided with a three-phase short circuit grounding bar and connected with a grounding system of the gas tank; when the first transmission shaft rotates to drive the gear to rotate clockwise or anticlockwise under the driving of the operating mechanism, the rack is driven and the movable contact is driven to move up and down, so that the three-position switch is switched on and off and grounded, namely, the movable contact is switched on when being inserted into the fixed contact, the movable contact is switched on when being inserted into the grounded fixed contact and grounded, and the movable contact is kept or returns to the middle position.

4. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 3, wherein: the vacuum moving contact is contacted or separated relative to the vacuum static contact to form the closing and opening of the vacuum arc-extinguishing chamber and the vacuum opening and closing unit; the upper end, the middle end and the lower end of the vacuum arc extinguish chamber are fixed by the upper support, the middle support and the lower support, and two sides of the vacuum arc extinguish chamber are fixed by the left support plate and the right support plate; one end of the series flexible connection is connected with the movable guide rod, the other end of the series flexible connection is connected with the movable contact base of the three-position switch, and the other end of the movable guide rod is connected with the vacuum movable contact in the vacuum arc extinguishing chamber; one end of the second transmission shaft protrudes out of the air box through a rotary seal to be linked with a second output shaft of the operating mechanism, and the other end of the second transmission shaft is arranged in the air box and drives the three-phase movable guide rod and the vacuum moving contact to move up and down through the rotary sliding of the pin shafts of the driving crank arm and the movable guide rod so as to realize the opening or closing of the three-phase vacuum arc-extinguishing chamber.

5. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 4, wherein: the vacuum switching unit and the three-position switch are driven by the operating mechanism to realize the combined switching-on, switching-off and grounding operations of the load switch or the isolating circuit breaker through the combination, switching-off and grounding cooperation of the vacuum moving contact and the combination, switching-off and grounding of the three-position switch; the moving contact moves upwards to be inserted into the fixed contact to realize connection with a bus under the driving of the operating mechanism, and then the vacuum moving contact is quickly closed to complete the switching-on operation and reach a switching-on state; the vacuum moving contact is quickly separated under the driving of the operating mechanism, and then the moving contact moves downwards to reach an isolation position to complete the brake separating operation and return to a brake separating state; the moving contact continuously moves downwards under the driving of the operating mechanism to insert the grounding fixed contact to be connected with a grounding loop, and then the vacuum moving contact is closed again to finish the grounding operation and reach a grounding state.

6. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 5, wherein: the moving contact, the static contact, the grounding static contact and the moving contact seat all adopt cylindrical and cylindrical structures, and the sliding electric contact modes among the moving contact, the static contact, the grounding static contact and the moving contact seat are coaxial circular electric contact modes.

7. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 4, wherein: and fixing the vacuum arc-extinguishing chamber and the movable contact base in a solid material pouring and sealing mode.

8. The environmentally friendly gas insulated, vacuum switching power distribution switchgear of claim 5, wherein: the three-station switch is simplified to be used as an isolating switch, the grounding fixed contact and the first fixed support thereof are structurally omitted, and the three-station switch is only switched on and off in function and is switched on and off with the switching on and off of the vacuum switching unit.

9. The environment-friendly gas-insulated vacuum-switching power distribution switchgear according to claim 1, characterized in that: the bus sleeve is of an inner conical shape, is installed in the sealed air chamber, and realizes the connection and expansion of buses among switch cabinets through a bus connector on the side surface of the sealed air chamber; or the bus sleeve is of an outer conical shape, is installed outside the sealed air chamber, and is connected and expanded with the insulated bus at the top of the sealed air chamber together with the insulated bus.