A switchgear cabinet

Abstract

The application belongs to the technical field of power distribution switchgear, and particularly relates to a switch cabinet. The switch cabinet of the application is characterized in that the main busbar assembly, the isolating static contact component, the three-position switch, the vacuum arc-extinguishing chamber component and the insulating pull rod are respectively installed on the support, so that the integration of the internal structure of the switch cabinet is improved, the main busbar assembly, the isolating static contact component, the three-position switch, the vacuum arc-extinguishing chamber component and the insulating pull rod can be installed in the cabinet shell together with the support, the installation process of the switch cabinet is simplified, and the production and manufacturing of the product are facilitated. In addition, the cable bus is arranged on the left and right sides of the cabinet shell, and the height dimension space of the cabinet shell is well saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power distribution switchgear, and particularly relates to a switch cabinet. BACKGROUND

[0002] In the power distribution switchgear, circuit control needs to be realized by cooperation of circuit breaker switches, disconnectors and grounding switches. In conventional power distribution switchgear, the three are independent structures and are not designed in an integrated manner. For example, circuit breaker switches VS1, VD4 and ZN28, disconnector GN19 and grounding switch JN15 are all independent units. Traditional switchgear combines three-position switches (circuit breaker switches, disconnectors and grounding switches) of multiple functional switches through the design of a shell to realize the functions and performance of the overall power distribution switchgear. The circuit breaker switches adopt a handcart type structure and achieve the insulation performance of the switchgear in the way of epoxy resin solid insulation. Once the insulation is damaged, it will be a permanent accident and the insulation cannot be restored. The switchgear combining multiple functional units has the advantage that the replaceable elements can be easily found during maintenance, but its size is large and a large installation space is required.

[0003] A three-position switch is a switch element integrating the functions of a disconnector and a grounding switch, which has a closing position, an opening position and a grounding position. The three-position switch integrates the functions of the disconnector and the grounding switch and is completed by one blade, so that mechanical interlocking can be realized to prevent the main circuit from being closed with the grounding switch. In addition to the above functions, the application of the three-position switch in the power distribution switchgear can also effectively reduce the size of the power distribution switchgear. However, the existing power distribution switchgear applying the three-position switch still has the problems of low integration, large installation space, complex structure and high use of consumables. SUMMARY

[0004] The application aims to overcome the problems of low integration and large installation space of the existing power distribution switchgear and provide a switch cabinet integrating a three-position switch, a vacuum arc-extinguishing chamber component and a main busbar assembly on a bracket for convenient production and manufacturing.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] The switch cabinet comprises a cabinet shell, a conductive assembly and a three-position switch, the switch chamber is provided with the three-position switch; the cabinet shell is provided with a switch chamber and a cable chamber arranged from top to bottom; the conductive assembly is arranged in the switch chamber and comprises a support, a main busbar assembly, an isolation static contact member, a vacuum arc chamber member and an insulation pull rod arranged on the support from top to bottom; a busbar cable passing area is formed between the cabinet shell side walls and the support; the isolation static contact member is connected to the lower end of the main busbar assembly; the vacuum arc chamber member is arranged on the upper side of the insulation pull rod; the busbar cable passing area is provided with a cable busbar; one end of the cable busbar is connected to the cable sleeve of the cable chamber; the other end of the cable busbar is connected to the movable contact part of the lower end of the vacuum arc chamber member through a flexible connecting piece; the fixed contact part of the upper end of the vacuum arc chamber member is connected to the three-position switch; when the insulation pull rod is driven, the movable contact part and the fixed contact part of the lower end of the vacuum arc chamber member are pushed to realize the power connection, so that the cable busbar realizes the power connection with the main busbar assembly through the vacuum arc chamber member and the three-position switch;

[0007] The three-position switch comprises a gate mechanism movably arranged between the isolation static contact member and the vacuum arc chamber member, which is used for controlling the conduction or disconnection of the cable sleeve through the vacuum arc chamber member and the isolation static contact member, and is used for controlling the conduction or disconnection of the cable sleeve through the vacuum arc chamber member and the grounding loop.

[0008] Compared with the prior art, the switch cabinet of the present application installs the main busbar assembly, the isolation static contact member, the three-position switch, the vacuum arc chamber member and the insulation pull rod on the support respectively, thereby improving the integration of the internal structure of the switch cabinet, facilitating the installation of the main busbar assembly, the isolation static contact member, the three-position switch, the vacuum arc chamber member and the insulation pull rod together with the support in the cabinet shell, simplifying the installation process of the switch cabinet and facilitating product production and manufacturing. In addition, the cable busbar is arranged on the left and right sides of the cabinet shell, which effectively saves the height dimension space of the cabinet shell.

[0009] Further, the support comprises a bottom mounting beam at the bottom, a top positioning frame at the top and insulation isolation frames at the two sides, the two insulation isolation frames are respectively connected to the two sides of the top positioning frame and the bottom mounting beam, and the insulation isolation frames are provided with heat dissipation holes arranged in the vertical direction; in this way, the support has good heat dissipation function and avoids high-temperature work of internal electrical elements.

[0010] Further, the bottom mounting beam is made of metal material, the support further comprises insulation plates at the two sides, the insulation plates are respectively connected to the opposite outer sides of the two insulation isolation frames and are arranged between the cable busbar and the bottom mounting beam, and the outer side of the cable busbar is sleeved with an insulation heat shrink tube; in this way, the insulation plates arranged between the cable busbar and the bottom mounting beam can effectively avoid the generation of arc and other dangerous factors between the two, thereby ensuring the safety of product use.

[0011] Further, the insulating isolation frame is provided with an internally open plug-in slot at the lower end, the bottom mounting beam is respectively limitedly mounted in the corresponding plug-in slot, and the insulating isolation frame and the bottom mounting beam are fixed through screw connection. Through such arrangement, the mounting connection between the insulating isolation frame and the bottom mounting beam is more stable, the insulation performance requirement is met, and the product has good reliability.

[0012] Further, the main bus assembly is arranged on the upper side of the top positioning frame, and further comprises a top mounting beam, the top mounting beam is connected with the main bus assembly through an insulating support member, the bracket is connected on the front wall plate and the rear wall plate of the switch chamber through the top mounting beam to fix the conductive assembly, and the bottom mounting beam extends out of the front and rear sides of the insulating isolation frame in the longitudinal direction, and the front and rear sides of the bottom mounting beam are respectively connected on the front wall plate and the rear wall plate of the switch chamber to support the conductive assembly. Through such arrangement, the assembly connection between the bracket and the cabinet shell is stable, and the product has good structural stability.

[0013] Further, the main bus assembly comprises a main bus member and side expansion sleeves connected on both sides of the main bus member, the isolation static contact member is arranged at the bottom of the top positioning frame, the main bus member is arranged at the top of the top positioning frame and electrically connected with the upper end of the isolation static contact member, the main bus member extends to both sides, the side expansion sleeves are respectively connected on the side wall plates of the switch chamber, the side expansion sleeves are in Z-shaped form, the upper end of the side expansion sleeve is connected with the outer end of the main bus member, and the lower end of the main bus member penetrates through the side wall plate of the switch chamber to form a busbar power expansion port. Through such arrangement, the Z-shaped main bus member can keep the busbar power expansion port at the outer end of the expansion bus at a specified height, improve the use versatility of the switch cabinet, and further save the height of the cabinet shell to meet the height requirement of the standardized side expansion sleeve of the normal pressure sealed switch cabinet.

[0014] Further, the bracket further comprises a bottom support arranged on the upper side of the bottom mounting beam, the vacuum arc-extinguishing chamber member is supported on the upper side of the bottom support, the insulating pull rod is arranged on the bottom mounting beam through a transmission structure, one side of the bottom support extends out of the busbar cable passing area through the insulating isolation frame, and the other end of the cable bus is connected on the outer side of the bottom support to fix the connection with the flexible connecting piece. The circuit on-off between the vacuum arc-extinguishing chamber member and the cable bus is realized through the circuit breaker operating mechanism which is used to drive the insulating pull rod to relatively move through the transmission structure, so that the movable contact part of the vacuum arc-extinguishing chamber member is closed or opened with the fixed contact part through the conductive rod. Through such arrangement, the on-off of the cable bus and the vacuum arc-extinguishing chamber member is controlled through the circuit breaker operating mechanism, the operation mode is simple, and the control effect of the on-off of the cable bus is good.

[0015] Further, the transmission structure comprises a main shaft rotatably connected to the bottom mounting beam and a crank arm connected to the main shaft, the outer end of the crank arm is rotatably connected to the insulating pull rod, and the circuit breaker operating mechanism is used to drive the main shaft to rotate relatively; in this way, the transmission structure is simple in structure and convenient to manufacture.

[0016] Further, the gate mechanism comprises a movable contact member and a three-position operating mechanism, one end of the movable contact member is elastically hinged to the upper end of the vacuum arc-extinguishing chamber member through a disc spring assembly, the other end of the movable contact member is a movable contact, and the three-position operating mechanism is used to drive the movable contact member to swing relatively so as to make the movable contact of the movable contact member close with the isolation static contact member, thereby conducting the electrical connection between the main busbar assembly and the cable sleeve, or make the movable contact separate from the isolation static contact member, thereby breaking the electrical connection between the main busbar assembly and the cable sleeve; in this way, the gate mechanism is simple in structure and good in effect of controlling the on-off of the main busbar assembly and the cable sleeve.

[0017] Further, the switch chamber side wall plate is provided with a grounding loop member connected to a grounding loop, the isolation static contact member is provided with an isolation static contact, the grounding loop member is provided with a three-phase grounding static contact, and the three positions of the three-position switch correspond to a closed position in which the movable contact contacts the isolation static contact, an isolation position in which the movable contact is suspended between the three-phase grounding static contact and the isolation static contact, and a grounding position in which the movable contact contacts the three-phase grounding static contact.

[0018] Further, the isolation static contact member is provided with a movable knife buffer member away from the movable contact, the movable contact is buffered and stopped on the movable knife buffer member when the movable contact is closed in place relatively to the isolation static contact member, and the lower end of the isolation static contact member is provided with an electric field control member; the grounding loop member is provided with a grounding buffer member away from the movable contact member, and the movable contact is buffered and stopped on the grounding buffer member when the movable contact is closed in place relatively to the grounding loop member; in this way, the movable contact member is effectively limited from moving excessively, and the limiting and buffering effect of the movable contact member is good. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic view of a switch cabinet.

[0020] Figure 2 A schematic view of a conductive assembly.

[0021] Figure 3 A perspective view of a conductive assembly.

[0022] Figure 4 A schematic view of an insulating isolation frame.

[0023] Explanation of reference numerals: cabinet shell 1, conductive assembly 2, three-position switch 3, switch chamber 4, cable chamber 5, support 6, isolated static contact member 22, vacuum interrupter member 23, insulating pull rod 24, busbar cable passing area 25, bottom mounting beam 61, top positioning frame 62, insulating isolation frame 63, heat dissipation hole 631, insulating plate 64, plug-in slot 632, top mounting beam 65, side expansion sleeve 211, main busbar member 212, bottom support 66, moving contact support member 67, cable busbar 241, main shaft 242, crank arm 243, isolated static contact 31, isolated position 32, ground return member 33, moving knife buffer 28, ground buffer 29, first lateral connecting frame 26, second lateral connecting frame 27, moving contact member 34, operating shaft 35, insulating connecting rod 36, plug 81, socket 82, plug-in part 83, pin hole 84, insulating baffle 88, insulating support member 60, flexible connecting member 245, cable sleeve 51, moving contact 231, fixed contact 232, support beam 213. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described below with reference to the accompanying drawings. In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Reference should be made to Figures 1 to 4The switch cabinet of the present application comprises a cabinet shell 1, a conductive assembly 2 and a three-position switch 3; the cabinet shell 1 is provided with a switch chamber 4 and a cable chamber 5 arranged from top to bottom, and the three-position switch 3 is arranged in the switch chamber 4; the conductive assembly 2 is arranged in the switch chamber 4 and comprises a support 6 and a main busbar assembly, an isolation static contact member 22, a vacuum arc-extinguishing chamber member 23 and an insulation pull rod 24 arranged on the support 6 from top to bottom; a busbar cable passing area 25 is formed between the two inner side walls of the cabinet shell 1 and the support 6; the isolation static contact member 22 is connected to the lower end of the main busbar assembly; the vacuum arc-extinguishing chamber member 23 is arranged on the upper side of the insulation pull rod 24; a cable busbar 241 connected to the cable sleeve 51 of the cable chamber 5 is arranged in the busbar cable passing area 25; one end of the cable busbar 241 is connected to the cable sleeve 51 of the cable chamber 5, and the other end of the cable busbar 241 is connected to the movable contact part 231 at the lower end of the vacuum arc-extinguishing chamber member 23 through a flexible connecting part 245; the fixed contact part 232 at the upper end of the vacuum arc-extinguishing chamber member 23 is connected to the three-position switch 3; when the insulation pull rod 24 is driven, the movable contact part 231 at the lower end of the vacuum arc-extinguishing chamber member 23 and the fixed contact part 232 are pushed to realize power connection, so that the cable busbar 241 realizes power connection with the main busbar assembly through the vacuum arc-extinguishing chamber member 23 and the three-position switch 3; the three-position switch 3 comprises a gate mechanism movably arranged between the isolation static contact member 22 and the vacuum arc-extinguishing chamber member 23, which is used to control the conduction or disconnection of the cable sleeve 51 through the vacuum arc-extinguishing chamber member 2 and the isolation static contact member 22, and is used to control the conduction or disconnection of the cable sleeve 51 through the vacuum arc-extinguishing chamber member 23 and the grounding loop.

[0026] Compared with the prior art, the switch cabinet of the present application improves the integration of the internal structure of the switch cabinet by installing the three-position switch 3, the main busbar assembly, the isolation static contact member 22, the vacuum arc-extinguishing chamber member 23 and the insulation pull rod 24 on the support 6, so that the main busbar assembly, the isolation static contact member 22, the three-position switch 3, the vacuum arc-extinguishing chamber member 23 and the insulation pull rod 24 can be installed in the cabinet shell 1 together with the support 6, which simplifies the installation process of the switch cabinet and facilitates product production and manufacturing. In addition, the cable busbar 241 is arranged on the left and right sides of the cabinet shell 1, which saves the height dimension space of the cabinet shell 1.

[0027] In one embodiment, the cable busbar 241 and the cable sleeve 51 are respectively provided with an insulating material on the outside, for example, the cable busbar 241 is sleeved with an insulating tube, and the cable sleeve 51 is sleeved with an insulating cap.

[0028] Referring to Figures 1 to 3In an embodiment, the bracket 6 comprises a bottom mounting beam 61 at the bottom, a top positioning frame 62 at the top, and two insulation isolation frames 63 at the two sides, the two insulation isolation frames 63 are respectively connected at the two sides of the top positioning frame 62 and the bottom mounting beam 61, so that the bracket 6 forms a frame structure, and the insulation isolation frame 63 is provided with a plurality of heat dissipation holes 631 arranged in the vertical direction; in this way, the bracket 6 has good heat dissipation function, and high-temperature work of internal electrical elements is avoided.

[0029] Referring to Figures 1 to 4 In an embodiment, the bottom mounting beam 61 is made of metal material, and the bottom mounting beam 61 is preferably made of iron material, which has the characteristics of high strength and hardness; the bracket 6 further comprises two insulation plates 64 at the two sides, the height of the insulation plate 64 is 1.2 to 3 times the height of the bottom mounting beam 61, the insulation plate 64 is respectively connected to the opposite outer sides of the two insulation isolation frames 63 and is arranged between the cable bus 241 and the bottom mounting beam 61, and the outer side of the cable bus 241 is sleeved with an insulation heat shrink tube; in this way, by arranging the insulation plate 64 between the cable bus 241 and the bottom mounting beam 61, the risk factors such as electric arc between the two are avoided, and the safety of product use is ensured.

[0030] Referring to Figures 1 to 3 In an embodiment, the lower end of the insulation isolation frame 63 is provided with an insertion clamping groove 632 with an inner opening, the two sides of the bottom mounting beam 61 are respectively limitedly installed in the corresponding insertion clamping grooves 632, and the insulation isolation frame 63 and the bottom mounting beam 61 are further fixed by screw connection; in this way, the installation and connection between the insulation isolation frame 63 and the bottom mounting beam 61 are more stable, the insulation performance requirement is met, and the product use reliability is good.

[0031] Referring to Figures 1 to 4 In an embodiment, the main bus assembly is arranged on the upper side of the top positioning frame 62, and further comprises a top mounting beam 65, the lower side of the top mounting beam 65 is connected to the upper side of the main bus assembly through an insulation support member 60, the bracket 6 is connected to the front wall plate and the rear wall plate of the switch chamber 4 through the top mounting beam 65 to fix the conductive assembly 2, the top mounting beam 65 and the top wall plate of the switch chamber 4 are connected by screw connection, and the bottom mounting beam 61 extends out of the front and rear sides of the insulation isolation frame 63 in the longitudinal direction, and the front and rear sides of the bottom mounting beam 61 are respectively connected to the front wall plate and the rear wall plate of the switch chamber 4 by screw connection to support the conductive assembly 2; in this way, the assembly and connection between the bracket 6 and the cabinet shell 1 are stable, and the product structure stability is good.

[0032] Referring to Figures 1 to 4In an embodiment, the conductive assemblies 2 and the three-position switches 3 are provided in three groups respectively, and the three groups of conductive assemblies 2 and three-position switches 3 are installed in the cabinet shell 1 along the longitudinal direction, the three groups of conductive assemblies 2 share the same bottom mounting beam 61 and top mounting beam 65, and the adjacent supports 6 are separated by the insulating baffle 88.

[0033] Referring to Figures 1 to 4 In an embodiment, the main bus assembly includes a main bus member 212 and side expansion sleeves 211 connected to both sides of the main bus member 212, the isolation static contact member 22 is arranged at the bottom of the top positioning frame 62, the main bus member 212 is arranged at the top of the top positioning frame 62 and is electrically connected to the upper end of the isolation static contact member 22, the main bus member 212 extends to both sides respectively, the outer ends of the two side expansion sleeves 211 are connected to the side wall plates of the switch chamber 4 respectively, the side expansion sleeves 211 are in the shape of a Z letter, the upper end of the side expansion sleeve 211 is connected to the outer end of the main bus member 212, and the lower end of the main bus member 212 penetrates the side wall plate of the switch chamber 4 to form a busbar power expansion port; in this way, the Z-shaped main bus member 212 can keep the busbar power expansion port at the outer end of the expansion bus at a specified height, improve the versatility of the switch cabinet, and also meet the height requirement of the standardized side expansion sleeve 211 of the normal pressure sealed switch cabinet, and the Z-shaped side expansion sleeve 211 can make the cable bus outside the cabinet shell connected to the corresponding side expansion sleeve 211 from both sides, meet the standardized height requirement of the cable sleeve 51 outside the cabinet shell and the side expansion sleeve, and further save the height of the cabinet shell 1.

[0034] In an embodiment, the left wall plate and the right wall plate of the switch chamber 4 are provided with support beams 213 on the upper side and the lower side of the side expansion sleeve 211 respectively, so that the side expansion sleeve 211 has better support force when connecting external cables.

[0035] Referring to Figures 1 to 4In an embodiment, the bracket 6 further comprises a bottom support 66 arranged on the upper side of the bottom mounting beam 61, the lower part of the vacuum interrupter component 23 is supported on the upper side of the bottom support 66, one side of the bottom support 6 extends out of the busbar cable passing area 25 through the insulation isolation frame 63, the other end of the cable bus 241 is connected to the outside of the bottom support 6 to fix the connection with the flexible connecting piece 245, the insulation pull rod 24 is arranged on the bottom mounting beam 61 through a transmission structure, and a circuit breaker operating mechanism (not shown in the figure) is further arranged, the circuit breaker operating mechanism is used to drive the insulation pull rod 24 to relatively move through the transmission structure, so that the cable bus 241 drives the conductive rod in the vacuum interrupter component 23 to close or open, and the circuit between the vacuum interrupter component 23 and the cable bus 241 is realized. Through such an arrangement, the opening and closing actions of the cable bus 241 and the vacuum interrupter component 23 are controlled by the circuit breaker operating mechanism, the operation mode is simple, and the control effect of the cable bus 241 is good.

[0036] Referring to Figure 1 In an embodiment, the transmission structure comprises a main shaft 242 rotatably connected to the bottom mounting beam 61 and a crank arm 243 connected to the main shaft 242, the outer end of the crank arm 243 is rotatably connected to the bottom of the insulation pull rod 24, and the circuit breaker operating mechanism is used to drive the main shaft 242 to relatively rotate in the forward and reverse directions, and further drives the insulation pull rod 24 to move up and down through the crank arm 243. Through such an arrangement, the transmission structure is simple in arrangement and convenient for production and manufacturing. The circuit breaker operating mechanism can adopt an existing mechanical device for driving the main shaft 242 to relatively rotate.

[0037] Referring to Figures 1 to 3 In an embodiment, the gate mechanism comprises a movable contact component 34 and a three-position operating mechanism (not shown in the figure), one end of the movable contact component 34 is elastically hinged to the fixed contact part 232 at the upper end of the vacuum interrupter component 23 through a disc spring assembly, and the other end of the movable contact component 34 is a movable contact, and the three-position operating mechanism is used to drive the movable contact component 34 to relatively swing so that the movable contact of the movable contact component 34 is closed with the isolation static contact component 22, so as to conduct the electrical connection between the main bus assembly and the cable sleeve 51, or the movable contact is opened with the isolation static contact component 22, so as to disconnect the electrical connection between the main bus assembly and the cable sleeve 51. Through such an arrangement, the gate mechanism is simple in structure, and the control effect of the main bus assembly and the cable sleeve 51 is good.

[0038] Referring to Figure 1In an embodiment, the bracket 6 further comprises a moving contact support member 67 arranged on the upper side of the bottom support 66, the vacuum interrupter member 23 is connected to the upper side of the moving contact support member 67 and penetrates through the upper side of the moving contact support member 67, and the lower end of the moving contact member 34 is rotatably connected to the upper end of the vacuum interrupter member 23.

[0039] Referring to Figures 1 to 4 In an embodiment, the side wall plate of the switch chamber 4 is provided with a grounding circuit member 33 connected with a grounding circuit, the end of the isolation stationary contact member 22 is provided with an isolation stationary contact 31, and the grounding circuit member 33 is provided with three-phase grounding stationary contacts. The three positions of the three-position switch 3 correspond to a closed position in which the moving contact is in contact with the isolation stationary contact 31, an isolation position in which the moving contact is suspended between the three-phase grounding stationary contacts and the isolation stationary contact 31, and a grounding position in which the moving contact is in contact with the three-phase grounding stationary contacts.

[0040] Referring to Figure 1 In an embodiment, the isolation stationary contact member 22 is provided with a moving knife buffer 28 away from the moving contact, the moving contact is buffered and stopped on the moving knife buffer 28 when the moving contact member 34 is closed to the position relative to the isolation stationary contact member 22, and the lower end of the isolation stationary contact member 22 is provided with an electric field control member (not shown). The grounding circuit member 33 is provided with a grounding buffer 29 away from the moving contact member, the moving contact is buffered and stopped on the grounding buffer 29 when the moving contact member 34 is closed to the position relative to the grounding circuit member 33, and the moving knife buffer 28 and the grounding buffer 29 are made of insulating materials, preferably made of silica gel materials. In this way, the moving contact member 34 is effectively limited from excessive movement, and the limiting and buffering effect of the moving contact member 34 is good.

[0041] Referring to Figures 1 to 4 In an embodiment, the bracket 6 is further provided with a first lateral connecting frame 26 and a second lateral connecting frame 27, the two sides of the bracket 6 are connected to the two side wall plates of the cabinet shell 1 through the first lateral connecting frame 26 and the second lateral connecting frame 27, respectively, the three-position operating mechanism comprises a driving device, an operating shaft 35 and an insulating connecting rod 36, the operating shaft 35 is arranged on the first lateral connecting frame 26, the two ends of the insulating connecting rod 36 are connected to the operating shaft 35 and the moving contact member 34, respectively, and the driving device can adopt an existing mechanical device for driving the main shaft 242 to rotate. The grounding circuit member 33 is arranged on the top of the second lateral connecting frame 27, so that the grounding circuit member 33 has better supporting force when the moving contact member 34 is closed to the grounding circuit member 33.

[0042] Referring to Figures 1 to 4In one embodiment, the top positioning frame 62, the movable contact support member 67 and the bottom support 66 are connected with the insulating isolation frame 63 through a mortise and tenon structure, which comprises a bolt 81, a mortise 82 arranged on the insulating isolation frame 63, and a plug-in part 83 arranged on both sides of the positioning plate, the plug-in part 83 being provided with a pin hole 84 arranged in the vertical direction, and after the plug-in part 83 is inserted into the corresponding mortise 82, the top positioning plate, the movable contact support member 67 and the bottom support 66 are fixedly connected with the insulating isolation frame 63 through the bolt 81 and the pin hole 84, and the insulating isolation frame 63, the bolt 81, the top positioning frame 62, the movable contact support member 67 and the bottom support 66 are respectively made of insulating materials.

[0043] Those skilled in the art can make modifications and variations to the above embodiments according to the disclosure and teachings of the specification. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present application shall fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. Switchgear, characterized in that, include: The cabinet shell is equipped with a switch room and a cable room arranged from top to bottom. The switch room is equipped with a three-position switch; A conductive assembly is arranged in the switch room, comprising a bracket and a main busbar assembly, an isolating static contact component, a vacuum interrupter component and an insulating pull rod arranged on the bracket from top to bottom; a busbar cable passing area is formed between the two side walls of the cabinet and the bracket; the isolating static contact component is connected to the lower end of the main busbar assembly; the vacuum interrupter component is arranged on the upper side of the insulating pull rod; a cable bus is arranged in the busbar cable passing area; one end of the cable busbar is connected to the cable bushing of the cable room; the other end of the cable busbar is connected to the moving contact portion at the lower end of the vacuum interrupter component through a flexible connector; the fixed contact portion at the upper end of the vacuum interrupter component is connected to the three-position switch; when the insulating pull rod is driven, it is used to push the moving contact portion and the fixed contact portion at the lower end of the vacuum interrupter component to achieve electrical connection, so that the cable busbar is electrically connected to the main busbar assembly through the vacuum interrupter component and the three-position switch; A three-position switch, comprising a gate mechanism movably arranged between the isolating static contact component and the vacuum interrupter component, for controlling the connection or disconnection of the cable bushing with the isolating static contact component through the vacuum interrupter component, and for controlling the connection or disconnection of the cable bushing with the grounding circuit through the vacuum interrupter component; The bracket includes a bottom mounting beam at the bottom, a top positioning frame at the top, and insulating isolation frames at both sides, wherein the two insulating isolation frames are respectively connected to both sides of the top positioning frame and the bottom mounting beam; The bracket also includes a bottom support member arranged on the upper side of the bottom mounting beam, the lower part of the vacuum arc chamber component is supported on the upper side of the bottom support member, the insulating pull rod is arranged on the bottom mounting beam through a transmission structure, one side of the bottom support member extends out of the bus cable passing area through the insulating isolation frame, the other end of the cable bus is connected to the outside of the bottom support member to fix the connection with the soft connector, and also includes a circuit breaker operating mechanism, the circuit breaker operating mechanism is used to drive the insulating pull rod to move relative to each other through the transmission structure, so that the moving contact part of the vacuum arc chamber component is closed or opened through the conductive rod and the fixed contact part, thereby realizing the circuit connection between the vacuum arc chamber component and the cable bus.

2. The switch cabinet according to claim 1, characterized in that: The bottom mounting beam is made of metal material, and the bracket also includes insulating plates located on both sides. The insulating plates are respectively connected to the opposite outer sides of the two insulating isolation frames and are arranged between the cable bus and the bottom mounting beam. The outer side of the cable bus is covered with an insulating heat shrink tube.

3. The switch cabinet according to claim 2, characterized in that: The lower end of the insulating isolation frame is provided with a plug-in slot with an inner opening, and both sides of the bottom mounting beam are respectively limitedly mounted in the corresponding plug-in slots.

4. The switch cabinet according to claim 1, characterized in that: The main busbar assembly is arranged on the upper side of the top positioning frame and also includes a top mounting beam. The top mounting beam is connected to the main busbar assembly through an insulating support member. The bracket is connected to the front wall plate and the rear wall plate of the switch room through the top mounting beam to fix the conductive assembly. The bottom mounting beam extends longitudinally out of the front and rear sides of the insulating isolation frame. The front and rear sides of the bottom mounting beam are respectively connected to the front wall plate and the rear wall plate of the switch room to support the conductive assembly.

5. The switch cabinet according to any one of claims 2 to 4, characterized in that: The main busbar assembly includes side expansion sleeves and main busbar components on both sides. The isolating static contact component is arranged at the bottom of the top positioning frame. The main busbar is arranged at the top of the top positioning frame and is electrically connected to the upper end of the isolating static contact. The main busbar components extend to both sides respectively. The side expansion sleeves are respectively connected to the two side wall panels of the switch room. The side expansion sleeves are Z-shaped. The upper end of the side expansion sleeve is connected to the outer end of the main busbar component, and the lower end of the side expansion sleeve passes through the side wall panel of the switch room to form a busbar power expansion port.

6. The switch cabinet according to claim 1, characterized in that: The transmission structure includes a main shaft rotatably connected to the bottom mounting beam and a crank arm connected to the main shaft. The outer end of the crank arm is rotatably connected to the insulating pull rod. The circuit breaker operating mechanism is used to drive the main shaft to rotate relative to it.

7. The switch cabinet according to claim 1, characterized in that: The gate mechanism includes a moving contact component and a three-position operating mechanism. One end of the moving contact component is elastically hinged to the upper end of the vacuum interrupter component through a disc spring assembly. The other end of the moving contact component is a moving contact. The three-position operating mechanism is used to drive the moving contact component to swing relative to each other so that the moving contact of the moving contact component and the isolating static contact component are closed, thereby conducting the electrical connection between the main busbar assembly and the cable sheath, or to open the moving contact and the isolating static contact component, thereby disconnecting the electrical connection between the main busbar assembly and the cable sheath.

8. The switch cabinet according to claim 7, characterized in that: The switch room side wall plate is provided with a grounding circuit component connected to the grounding circuit, the isolating static contact component is provided with an isolating static contact, and the grounding circuit component is provided with a three-phase grounding static contact. The three positions of the three-position switch respectively correspond to a closing position in which the moving contact contacts the isolating static contact, an isolation position in which the moving contact is suspended between the three-phase grounding static contact and the isolating static contact, and a grounding position in which the moving contact contacts the three-phase grounding static contact. A moving blade buffer is provided on the side of the isolating static contact member away from the moving contact. When the moving contact is closed relative to the isolating static contact member, the moving contact buffer is stopped on the moving blade buffer. An electric field control member is provided at the lower end of the isolating static contact member. A grounding buffer is provided on the side of the grounding loop component away from the moving contact. When the moving contact is closed relative to the grounding loop component, the moving contact is buffered and stopped on the grounding buffer.

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