CN110957662A - Box-shared solid insulated switch - Google Patents

Abstract

The invention relates to a common-box type solid insulation switch, which comprises a circuit breaker and an isolation switch, wherein the circuit breaker comprises an upper semi-insulation box, a circuit breaking driving shaft is arranged in the upper semi-insulation box, the circuit breaking driving shaft is connected with a circuit breaking mechanism through a circuit breaking transmission device, three groups of wire inlet sleeves are arranged on one side of the upper semi-insulation box, a wire inlet connecting piece and a vacuum bulb are arranged in each wire inlet sleeve, a moving contact of the vacuum bulb is connected with the circuit breaking driving shaft through a pull rod assembly, and the pull rod assembly is; the isolating switch comprises a lower semi-insulating box, three groups of isolating knife assemblies, isolating driving shafts and grounding assemblies are arranged in the lower semi-insulating box, the isolating driving shafts are connected with an isolating mechanism through an isolating transmission device, three groups of outgoing line sleeves are arranged at the bottom of the lower semi-insulating box, outgoing line connecting pieces in the three groups of outgoing line sleeves are correspondingly connected with the three groups of isolating knife assemblies, and the upper semi-insulating box and the lower semi-insulating box are mutually buckled and connected through flanges. The device has the advantages of compact structure, convenience in maintenance and high reliability.

Description

Box-shared solid insulated switch

Technical Field

The invention relates to an insulating switch, in particular to a three-phase common-box type solid insulating switch with the voltage level of 12 kV.

Background

In the field of power transmission and distribution, the existing solid insulated switch usually adopts a three-phase unit combined structure form, and the problems of complex preparation process, high material cost, inconvenience in installation and debugging, more transmission parts and poor reliability exist in practical application.

Disclosure of Invention

The invention aims to provide a common-box type solid insulated switch which has the advantages of compact structure, low cost, convenience in installation and maintenance and high reliability.

In order to solve the problems in the prior art, the invention provides a common-box type solid insulation switch which comprises a circuit breaker and an isolation switch, wherein the circuit breaker comprises an upper semi-insulation box with a downward opening, an insulated circuit breaking driving shaft is arranged in an inner cavity of the upper semi-insulation box, the circuit breaking driving shaft is connected with a circuit breaking mechanism arranged outside the upper semi-insulation box through a circuit breaking transmission device, three groups of wire inlet sleeves connected with the upper semi-insulation box into a whole are arranged on one side of the upper semi-insulation box, a wire inlet connecting piece and a vacuum bulb are arranged in each wire inlet sleeve, one end of each wire inlet connecting piece extends out of each wire inlet sleeve, the other end of each wire inlet connecting piece is connected with a static contact of the vacuum bulb, a moving contact of the vacuum bulb is connected with the circuit breaking driving shaft through a conductive pull rod assembly, and; the isolating switch comprises a lower semi-insulating box with an upward opening, three groups of isolating knife assemblies and an isolating driving shaft for driving the three groups of isolating knife assemblies to synchronously act are arranged in an inner cavity of the lower semi-insulating box, the isolating driving shaft is made of insulating materials and is connected with an isolating mechanism arranged on the outer side of the lower semi-insulating box through an isolating transmission device, three groups of outgoing line sleeves connected with the lower semi-insulating box into a whole are arranged at the bottom of the lower semi-insulating box, one ends of outgoing line connecting pieces in the three groups of outgoing line sleeves respectively extend out of corresponding outgoing line sleeves, the other ends of the outgoing line connecting pieces in the three groups of outgoing line sleeves are correspondingly connected with the three groups of isolating knife assemblies, and a grounding assembly is further arranged; the upper semi-insulating box and the lower semi-insulating box are buckled with each other and connected through flanges, when the isolation switch-on is conducted, the three groups of isolation knife assemblies are correspondingly connected with the three isolation contacts, and when the ground switch-on is conducted, the three groups of isolation knife assemblies are respectively connected with the ground assembly.

Further, the invention relates to a common-box type solid insulation switch, wherein the pull rod assembly comprises a support, a positioning plate, two driving crank arms, a pull rod, a guide sleeve, two guide posts and a spring, the support is obliquely arranged, the upper end of the support is arranged on a circuit breaking driving shaft through a bearing, the lower end of the support is connected with the lower end of the positioning plate and an isolation contact and is jointly fixed on an upper half insulation box, the upper half part of the support is provided with the guide plate, the guide plate is provided with a first guide groove, the two driving crank arms are correspondingly arranged on two sides of the support and are fixed on the circuit breaking driving shaft, one end of the pull rod penetrates through a positioning hole on the positioning plate and is connected with a moving contact of a vacuum bubble, the guide sleeve is coaxially fixed at the other end of the pull rod, the guide sleeve is clamped on the guide plate through a second guide groove, the guide posts vertically penetrate through the guide sleeve and are arranged, the guide post is provided with two rollers which are correspondingly positioned in the driving grooves of the two driving crank arms, and the spring is sleeved on the pull rod, so that two ends of the spring are correspondingly pressed on the positioning plate and the guide sleeve.

Further, the invention relates to a common-box type solid insulated switch, wherein the guide sleeve and the pull rod are fixed in the following way: the guide sleeve is sleeved on the pull rod and fixed by the pin shaft, and a third guide groove corresponding to the second guide groove is formed in the pull rod.

Furthermore, the common-box type solid insulation switch comprises a support arm, the lower end of the support arm is fixed, and the support arm is connected with the outgoing line connecting piece, the upper end of the support arm is hinged with two symmetrical knife boards, the middle parts of the two knife boards are hinged with an I-shaped driving shaft connecting piece, one ends of the two knife boards, far away from the support arm, are provided with sleeves through limiting pin shafts, the sleeves are located between the two knife boards, and the lower end of the support arm is fixed with an isolation cover.

Furthermore, the common-box type solid insulation switch comprises an isolation driving shaft, wherein the isolation driving shaft comprises a shaft part and three sleeve parts which are integrated, one end of the shaft part is installed on the lower semi-insulation box through a bearing seat, the other end of the shaft part is inserted into an isolation transmission device through a hexagonal hole, and the three sleeve parts are correspondingly sleeved on driving shaft connecting pieces of the three groups of isolation knife assemblies.

Furthermore, the common-box solid insulation switch is characterized in that an insulation partition plate is arranged between adjacent pull rod assemblies in an inner cavity of the upper semi-insulation box, a gap is formed in the position, corresponding to the circuit-breaking driving shaft, of the insulation partition plate, and an insulation blocking disc used for blocking the gap is fixed on one side of the insulation partition plate of the circuit-breaking driving shaft.

Furthermore, the invention relates to a common-box type solid insulation switch, wherein an operation opening is formed in the other side, opposite to the wire inlet sleeve, of the upper half insulation box, an insulation cover plate is installed at the operation opening through screws, and a sealing gasket is arranged between the insulation cover plate and the upper half insulation box.

Furthermore, the common-box type solid insulation switch comprises a grounding connection plate fixed at the bottom of the inner cavity of the lower semi-insulation box, three L-shaped grounding cutters corresponding to the isolation cutter assemblies are fixed on the grounding connection plate, and the grounding connection plate is connected with a ground wire binding post arranged at the bottom of the lower semi-insulation box.

Further, the invention relates to a common-box type solid insulation switch, wherein a sealing ring groove is arranged at the joint of the lower semi-insulation box and the upper semi-insulation box, and a sealing ring is arranged in the sealing ring groove.

Furthermore, the invention relates to a common-box type solid insulated switch, wherein the circuit breaker, the isolating switch, the circuit breaking mechanism and the isolating mechanism are fixedly connected with the arranged support plate.

Compared with the prior art, the common-box type solid insulated switch has the following advantages: the invention sets a breaker and an isolating switch, the breaker is provided with an upper semi-insulating box with a downward opening, an insulated breaking driving shaft is arranged in the inner cavity of the upper semi-insulating box, the breaking driving shaft is connected with a breaking mechanism arranged on the outer side of the upper semi-insulating box through a breaking transmission device, three groups of wire inlet sleeves connected with the upper semi-insulating box into a whole are arranged on one side of the upper semi-insulating box, a wire inlet connecting piece and a vacuum bubble are arranged in each wire inlet sleeve, one end of each wire inlet connecting piece extends out of each wire inlet sleeve, the other end of each wire inlet connecting piece is connected with a static contact of the vacuum bubble, a moving contact of the vacuum bubble is connected with the breaking driving shaft through a conductive pull rod assembly, and three isolating contacts correspondingly connected with the pull rod; meanwhile, the isolating switch is provided with a lower semi-insulating box with an upward opening, three groups of isolating knife assemblies and an isolating driving shaft for driving the three groups of isolating knife assemblies to synchronously act are arranged in an inner cavity of the lower semi-insulating box, the isolating driving shaft is made of insulating materials and is connected with an isolating mechanism arranged on the outer side of the lower semi-insulating box through an isolating transmission device, three groups of outgoing line sleeves connected with the lower semi-insulating box into a whole are arranged at the bottom of the lower semi-insulating box, one ends of outgoing line connecting pieces in the three groups of outgoing line sleeves respectively extend out of the corresponding outgoing line sleeves, the other ends of the outgoing line connecting pieces in the three groups of outgoing line sleeves are correspondingly connected with the three groups of isolating knife assemblies, and a grounding assembly is arranged in the inner cavity; the upper semi-insulating box and the lower semi-insulating box are buckled with each other and connected through flanges, when isolation is switched on, the three groups of isolation knife assemblies are correspondingly connected with the three isolation contacts, and when grounding is switched on, the three groups of isolation knife assemblies are respectively connected with the grounding assembly. Therefore, the common-box type solid insulated switch with compact structure, low cost, convenient installation and maintenance and high reliability is formed. In practical application, the incoming lines of three-phase electricity are correspondingly connected with the three groups of incoming line sleeves, the outgoing lines of the three-phase electricity are correspondingly connected with the three groups of outgoing line sleeves, and the circuit breaking driving shaft is driven to act through the circuit breaking mechanism, so that the moving and static contacts of vacuum bubbles in the three groups of incoming line sleeves are contacted or separated, and the purpose of closing or opening the circuit breaker can be achieved; the isolation driving shaft is driven to act through the isolation mechanism, the three groups of isolation knife assemblies are correspondingly connected with or separated from the three isolation contacts, the switching-on or switching-off purpose of the isolation switch can be achieved, and the three groups of isolation knife assemblies are respectively connected with the grounding assembly, so that the grounding purpose can be achieved. The upper half insulation box and the lower half insulation box are correspondingly arranged on the circuit breaker and the isolating switch, the upper half insulation box and the lower half insulation box are mutually buckled to form the whole box body, and the three groups of circuit breaking and isolating parts are arranged in the same box body, so that the three-phase common-box type solid insulation switch is formed.

The common-box solid-insulated switch of the present invention will be described in further detail with reference to the embodiments shown in the drawings.

Drawings

Fig. 1 is a front view of a common box type solid insulated switch of the present invention;

fig. 2 is a left side view of a common case type solid insulation switch of the present invention;

fig. 3 is a first perspective view of a common-box type solid insulated switch according to the present invention;

fig. 4 is a second perspective view of a common-box type solid insulated switch according to the present invention;

FIG. 5 is a view taken along line A-A of FIG. 2;

FIG. 6 is a view taken along line B-B of FIG. 2;

fig. 7 is a front view of a circuit breaker in a common case type solid insulated switch according to the present invention;

fig. 8 is a bottom view of a circuit breaker in a common case type solid insulated switch according to the present invention;

fig. 9 is a perspective view of a circuit breaker in a common case type solid insulated switch according to the present invention;

fig. 10 is a front view of an isolator switch in a common case type solid insulated switch according to the present invention;

fig. 11 is a top view of an isolator switch in a common case type solid insulated switch according to the present invention;

fig. 12 is a perspective view of an isolator switch in a common case type solid insulated switch according to the present invention;

fig. 13 is a front view of a drawbar assembly in a common case type solid insulated switch according to the present invention;

fig. 14 is a perspective view of a draw bar assembly in a common case type solid insulated switch according to the present invention;

fig. 15 is an exploded view of a drawbar assembly in a common case type solid insulated switch according to the present invention;

fig. 16 is a front view of an isolation blade assembly in a common case type solid insulated switch according to the present invention;

fig. 17 is a perspective view of an isolation knife assembly in a common case type solid insulated switch according to the present invention;

fig. 18 is a perspective view of an isolation driving shaft in a common case type solid insulation switch according to the present invention.

Detailed Description

First, it should be noted that, the directional terms such as up, down, left, right, front, rear, etc. described in the present invention are only described with reference to the accompanying drawings for understanding, and are not intended to limit the technical solution and the claimed scope of the present invention.

As shown in fig. 1 to 18, an embodiment of a common-box type solid insulated switch according to the present invention includes a circuit breaker 1 and a disconnector 2. The circuit breaker 1 is provided with an upper half insulating case 11 with a downward opening, an insulated breaking drive shaft 12 is provided in an inner cavity of the upper half insulating case 11, and the breaking drive shaft 12 is connected to a breaking mechanism 3 provided outside the upper half insulating case 11 through a breaking transmission device 13. Three groups of wire inlet sleeves 14 connected with the upper semi-insulating box 11 into a whole are arranged on one side of the upper semi-insulating box 11, a wire inlet connecting piece 15 and a vacuum bubble 16 are arranged in each wire inlet sleeve 14, one end of each wire inlet connecting piece 15 extends out of each wire inlet sleeve 14, the other end of each wire inlet connecting piece 15 is connected with a static contact of each vacuum bubble 16, and a movable contact of each vacuum bubble 16 is connected with the circuit breaking driving shaft 12 through a conductive pull rod assembly 17. And three isolating contacts 18 correspondingly connected with the pull rod assembly 17 are arranged in the inner cavity of the upper semi-insulating box 11. The isolating switch 2 is provided with a lower semi-insulating box 21 with an upward opening, three groups of isolating knife assemblies 22 and an isolating driving shaft 23 for driving the three groups of isolating knife assemblies 22 to synchronously act are arranged in an inner cavity of the lower semi-insulating box 21, and the isolating driving shaft 23 is made of insulating materials and is connected with an isolating mechanism 4 arranged on the outer side of the lower semi-insulating box 21 through an isolating transmission device 24. Three groups of outlet bushings 25 connected with the lower semi-insulating box 21 into a whole are arranged at the bottom of the lower semi-insulating box, one ends of outlet connectors 26 in the three groups of outlet bushings 25 respectively extend out of the corresponding outlet bushings 25, and the other ends of the outlet connectors 26 in the three groups of outlet bushings 25 are correspondingly connected with the three groups of isolation knife assemblies 22. And a grounding assembly 27 is disposed in the interior cavity of the lower semi-insulating tank 21. During assembly, the upper semi-insulating box 11 and the lower semi-insulating box 21 are buckled with each other and connected through flanges, during isolation and switching-on, the three groups of isolation knife assemblies 22 are correspondingly connected with the three isolation contacts 18, and during grounding and switching-on, the three groups of isolation knife assemblies 22 are respectively connected with the grounding assembly 27.

The common-box type solid insulated switch with compact structure, low cost, convenient installation and maintenance and high reliability is formed by the structure. In practical application, the incoming lines of three-phase electricity are correspondingly connected with the three groups of incoming line sleeves 14, the outgoing lines of the three-phase electricity are correspondingly connected with the three groups of outgoing line sleeves 25, the circuit breaking driving shaft 12 is driven to act through the circuit breaking mechanism 3, and the moving and static contacts of the vacuum bubbles 16 in the three groups of incoming line sleeves 14 are contacted or separated, so that the purpose of closing or opening the circuit breaker 1 can be achieved; the isolation driving shaft 24 is driven to act by the isolation mechanism 4, so that the three groups of isolation knife assemblies 22 are correspondingly connected with or separated from the three isolation contacts 18, the switching-on or switching-off purpose of the isolation switch 2 can be realized, and the three groups of isolation knife assemblies 22 are respectively connected with the grounding assembly 27, so that the grounding purpose can be realized. The circuit breaker 1 and the isolating switch 2 are correspondingly provided with the upper semi-insulating box 11 and the lower semi-insulating box 21, the upper semi-insulating box 11 and the lower semi-insulating box 21 are mutually buckled to form a whole box body, and three groups of circuit breaking and isolating parts are arranged in the same box body to form the three-phase common-box type solid insulating switch. It should be noted that in practical applications, the upper semi-insulating box 11 and the lower semi-insulating box 21 are usually made of epoxy resin, and the disconnecting drive shaft 12 is usually a hexagonal shaft, but is not limited thereto; the isolation switch-on is that the isolating switch is in a switch-on state, namely that the outgoing line is communicated with the isolation contact through the isolating switch, and the grounding switch-on is that the isolating switch is in a grounding state, namely that the outgoing line is communicated with the grounding assembly through the isolating switch; the circuit breaking mechanism and the isolating mechanism are common equipment in the field, the circuit breaking mechanism is a circuit breaker operating mechanism and is used for operating a circuit breaker, and the isolating mechanism is an isolating switch operating mechanism and is used for operating an isolating switch, so that the details are not repeated.

As a specific embodiment, the present invention provides the lever assembly 17 with a bracket 171, a positioning plate 172, a driving crank 173, a lever 174, a guide sleeve 175, a guide post 176, and a spring 177. The holder 171 is disposed obliquely, the upper end of the holder 171 is mounted on the disconnecting drive shaft 12 via a bearing, the lower end of the holder 171 is connected to the lower end of the positioning plate 172 and the disconnecting contact 18 and fixed to the upper half insulating case 11, the guide plate 1711 is disposed on the upper half portion of the holder 171, and the first guide groove 1712 is disposed on the guide plate 1711. Two drive levers 173 are provided so that the two drive levers 173 are disposed on both sides of the bracket 171 and fixed to the disconnecting drive shaft 12. One end of the pull rod 174 passes through the positioning hole 1721 of the positioning plate 172 and is connected to the movable contact of the vacuum bulb 16, the guide sleeve 175 is coaxially fixed to the other end of the pull rod 174, and the guide sleeve 175 is clamped on the guide plate 1711 through the second guide slot 1751. The guiding post 176 vertically passes through the guiding sleeve 175 and is located in the first guiding slot 1712, two rollers 1761 are disposed on the guiding post 176, the two rollers 1761 are correspondingly located in the driving slots 1731 of the two driving crank arms 173, and the spring 177 is sleeved on the pull rod 174, and two ends of the spring are correspondingly pressed against the positioning plate 172 and the guiding sleeve 175. The pull rod assembly with the structure has the advantages of simple structure, convenience in disassembly and assembly, stability in transmission and reliability in connection, the driving connecting lever is driven to rotate by the circuit-breaking driving shaft, the guide post can drive the pull rod and the vacuum bubble moving contact through the guide sleeve under the dual actions of the driving groove of the driving connecting lever and the first guide groove of the support, the circuit breaker is further closed or opened, and the stability and the reliability of the action are enhanced through the spring. It should be noted that, in practical applications, the bracket, the positioning plate, the driving crank arm, the pull rod, the guide sleeve, the guide post and the spring are usually made of metal materials with conductive performance, so as to ensure the reliability of connection between the pull rod assembly and the isolation contact. As a specific embodiment, the present invention employs the following fixing methods for the guide sleeve 175 and the pull rod 174: the guide sleeve 175 is fitted over the pull rod 174 and fixed thereto by a pin, and a third guide groove 1741 corresponding to the second guide groove 1751 is provided in the pull rod 174.

As a specific embodiment, the present invention provides the following structure for the isolation knife assembly 22: the device comprises a support arm 221 with the lower end fixed and connected with the outgoing line connecting piece 26, two symmetrical knife boards 222 hinged at the upper end of the support arm 221, an I-shaped driving shaft connecting piece 223 hinged at the middle part of the two knife boards 222, a sleeve 224 installed at one end of the two knife boards 222 far away from the support arm 221 through a limiting pin shaft, the sleeve 224 is positioned between the two knife boards 222, and a separation cover 225 is fixed at the lower end of the support arm 221. The isolating knife assembly has the advantages of simple structure, reliable connection and strong adaptability. Meanwhile, the isolation driving shaft adopts the following structure: including integrative axial region 231 and three cover portion 232, make the one end of axial region 231 pass through bearing frame 233 and install on semi-insulating case 21 down, make the other end of axial region 231 peg graft with keeping apart transmission 24 through the hexagonal hole 234 that sets up to make three cover portions 232 correspond the cover on the drive shaft connecting piece 223 of three groups of isolation sword subassemblies 22. The isolation driving shaft has the advantages of simple structure, convenience in connection and good synchronism.

As an optimized scheme, in the present embodiment, an insulating partition plate 111 is disposed in the inner cavity of the upper semi-insulating box 11 and between adjacent tie rod assemblies 17, so that the insulating partition plate 111 is provided with a gap at a position corresponding to the disconnecting drive shaft 12, and an insulating blocking disc 121 for blocking the gap is fixed on one side of the insulating partition plate 111 of the disconnecting drive shaft 12. The arrangement can avoid the mutual influence between the pull rod assemblies through the insulating baffle plate, and the safety reliability and the practicability are enhanced. Meanwhile, the present embodiment provides the upper half insulation box 11 with an operation opening on the other side opposite to the wire inlet sleeve 14, and provides the operation opening with an insulation cover plate 19 by means of screws, and provides a gasket 191 between the insulation cover plate 19 and the upper half insulation box 11. The convenience of assembling the circuit breaker is improved through the operation opening, and the insulating property of the upper half insulating box is ensured through the insulating cover plate and the sealing gasket. In addition, the present embodiment adopts the following configuration for the grounding unit 27: the grounding connection plate 271 is fixed at the bottom of the inner cavity of the lower semi-insulating box 21, three L-shaped grounding knives 272 corresponding to the isolation knife assemblies 22 are fixed on the grounding connection plate 271, and the grounding connection plate 271 is connected with a ground wire binding post arranged at the bottom of the lower semi-insulating box 21. The grounding assembly with the arrangement has the characteristics of simple structure and reliable connection. In order to ensure the sealing and insulating performance between the lower semi-insulating box 21 and the upper semi-insulating box 11, the present embodiment further provides a sealing ring groove 211 at the joint of the lower semi-insulating box 21 and the upper semi-insulating box 11, and a sealing ring is disposed in the sealing ring groove 211.

It should be noted that, in practical applications, the circuit breaker 1, the disconnecting switch 2, the breaking mechanism 3 and the disconnecting mechanism 4 are all fixedly connected with the arranged support plate 5 to form a modular switchgear, so that the modular switchgear is conveniently and integrally assembled into a switchgear cabinet.

The above examples are only for describing the preferred embodiments of the present invention, and do not limit the scope of the claimed invention, and various modifications made by those skilled in the art according to the technical solutions of the present invention should fall within the scope of the invention defined by the claims without departing from the design concept of the present invention.

Claims (10)

1. A common-box type solid insulation switch comprises a circuit breaker (1) and a disconnecting switch (2), and is characterized in that the circuit breaker (1) comprises an upper semi-insulation box (11) with a downward opening, an insulated breaking driving shaft (12) is arranged in an inner cavity of the upper semi-insulation box (11), the breaking driving shaft (12) is connected with a breaking mechanism (3) arranged on the outer side of the upper semi-insulation box (11) through a breaking transmission device (13), three groups of inlet wire sleeves (14) connected with the upper semi-insulation box (11) into a whole are arranged on one side of the upper semi-insulation box (11), an inlet wire connecting piece (15) and a vacuum bulb (16) are arranged in the inlet wire sleeves (14), one end of the inlet wire connecting piece (15) extends out of the inlet wire sleeves (14), the other end of the inlet wire connecting piece (15) is connected with a static contact of the vacuum bulb (16), a moving contact of the vacuum bulb (16) is connected with, the inner cavity of the upper semi-insulating box (11) is also provided with three isolating contacts (18) correspondingly connected with the pull rod assembly (17); the isolating switch (2) comprises a lower semi-insulating box (21) with an upward opening, three groups of isolating knife assemblies (22) and an isolating driving shaft (23) for driving the three groups of isolating knife assemblies (22) to synchronously act are arranged in an inner cavity of the lower semi-insulating box (21), the isolating driving shaft (23) is made of an insulating material and is connected with an isolating mechanism (4) arranged on the outer side of the lower semi-insulating box (21) through an isolating transmission device (24), three groups of outgoing line sleeves (25) connected with the lower semi-insulating box (21) into a whole are arranged at the bottom of the lower semi-insulating box, one ends of outgoing line connecting pieces (26) in the three groups of outgoing line sleeves (25) respectively extend out of the corresponding outgoing line sleeves (25), the other ends of the outgoing line connecting pieces (26) in the three groups of outgoing line sleeves (25) are correspondingly connected with the three groups of isolating knife assemblies (22), and a grounding assembly (27) is further arranged; the upper semi-insulating box (11) and the lower semi-insulating box (21) are buckled with each other and connected through flanges, when the isolation switch-on is conducted, three groups of isolation knife assemblies (22) are correspondingly connected with three isolation contacts (18), and when the ground switch-on is conducted, the three groups of isolation knife assemblies (22) are respectively connected with a ground assembly (27).

2. A common-box type solid insulation switch according to claim 1, wherein the pull rod assembly (17) comprises a bracket (171), a positioning plate (172), two driving crank arms (173), a pull rod (174), a guide sleeve (175), a guide post (176) and a spring (177), the bracket (171) is obliquely arranged, the upper end of the bracket (171) is mounted on the circuit breaking driving shaft (12) through a bearing, the lower end of the bracket (171) is connected with the lower end of the positioning plate (172) and the isolation contact (18) and is jointly fixed on the upper half insulation box (11), the upper half part of the bracket (171) is provided with a guide plate (1711), the guide plate (1711) is provided with a first guide groove (1712), the two driving crank arms (173) are provided, the two driving crank arms (173) are correspondingly positioned at two sides of the bracket (171) and are fixed on the circuit breaking driving shaft (12), and one end of the pull rod (174) passes through the positioning plate (1721) on the positioning plate (172) and is connected with the vacuum bulb (16) The moving contacts are connected, the guide sleeve (175) is coaxially fixed at the other end of the pull rod (174), the guide sleeve (175) is clamped on the guide plate (1711) through a second guide groove (1751) which is arranged, the guide column (176) vertically penetrates through the guide sleeve (175) and is positioned in the first guide groove (1712), two rollers (1761) are arranged on the guide column (176), the two rollers (1761) are correspondingly positioned in the driving grooves (1731) of the two driving crank arms (173), and the spring (177) is sleeved on the pull rod (174) and two ends of the spring are correspondingly pressed on the positioning plate (172) and the guide sleeve (175).

3. A common-box solid insulated switch according to claim 2, characterized in that the guide sleeve (175) and the tie rod (174) are fixed in such a way that: the guide sleeve (175) is sleeved on the pull rod (174) and fixed by a pin shaft, and a third guide groove (1741) corresponding to the second guide groove (1751) is arranged on the pull rod (174).

4. A common-box type solid insulation switch according to claim 3, wherein the isolation knife assembly (22) comprises a support arm (221) fixed at the lower end and connected with the outgoing line connector (26), the upper end of the support arm (221) is hinged with two symmetrical knife boards (222), the middle parts of the two knife boards (222) are hinged with an I-shaped driving shaft connector (223), one ends of the two knife boards (222) far away from the support arm (221) are provided with sleeves (224) through limit pins, the sleeves (224) are arranged between the two knife boards (222), and the lower end of the support arm (221) is fixed with an isolation cover (225).

5. A common-box type solid insulation switch according to claim 4, characterized in that the isolation driving shaft (23) comprises an integrated shaft part (231) and three sleeve parts (232), one end of the shaft part (231) is installed on the lower semi-insulation box (21) through a bearing seat (233), the other end of the shaft part (231) is inserted into the isolation transmission device (24) through a hexagonal hole (234), and the three sleeve parts (232) are correspondingly sleeved on the driving shaft connecting parts (223) of the three groups of isolation knife assemblies (22).

6. A common-box type solid insulation switch according to claim 5, characterized in that an insulating partition plate (111) is arranged between adjacent pull rod assemblies (17) in the inner cavity of the upper semi-insulating box (11), a gap is arranged at the position of the insulating partition plate (111) corresponding to the position of the open circuit driving shaft (12), and an insulating blocking disk (121) for blocking the gap is fixed on one side of the insulating partition plate (111) of the open circuit driving shaft (12).

7. A common box type solid insulation switch according to claim 6, characterized in that the upper half insulation box (11) is provided with an operation opening at the other side opposite to the wire inlet bushing (14), the operation opening is provided with an insulation cover plate (19) through a screw, and a sealing gasket (191) is arranged between the insulation cover plate (19) and the upper half insulation box (11).

8. A common-box type solid insulation switch according to claim 7, characterized in that the grounding assembly (27) comprises a grounding connection plate (271) fixed at the bottom of the inner cavity of the lower semi-insulating box (21), three L-shaped grounding blades (272) corresponding to the isolating blade assembly (22) are fixed on the grounding connection plate (271), and the grounding connection plate (271) is connected with a ground wire terminal arranged at the bottom of the lower semi-insulating box (21).

9. A common box type solid insulation switch according to any of claims 1 to 8, characterized in that the lower half insulation box (21) is provided with a sealing ring groove (211) at the connection with the upper half insulation box (11), and a sealing ring is arranged in the sealing ring groove (211).

10. A common-box solid insulated switch according to any of claims 1-8, characterized in that the breaker (1), disconnector (2), breaking mechanism (3) and disconnector mechanism (4) are all fixedly connected to the provided support plate (5).

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