CN213483645U

CN213483645U - Low-voltage vacuum circuit breaker with electric isolation for feed switch

Info

Publication number: CN213483645U
Application number: CN202023176634.2U
Authority: CN
Inventors: 于继辉; 牛鑫; 蒋文权; 何茂; 李安军
Original assignee: Henan Province Jiyuan City Xinke Mine Electric Appliance Co ltd
Current assignee: Henan Province Jiyuan City Xinke Mine Electric Appliance Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-06-18
Anticipated expiration: 2030-12-25

Abstract

The utility model provides a feed switch is with low pressure vacuum circuit breaker who takes electric isolation for solve among the current mining low voltage power supply unit isolator and vacuum load switch separately install or both distance is far away, lead to overhauing inconvenient, cause technical problem such as dangerous accident easily. The utility model discloses a flame proof shell is equipped with isolator and vacuum circuit breaker in the flame proof shell respectively, and vacuum circuit breaker fixes on flame proof shell, the top is equipped with the connecting plate, installs actuating mechanism on the connecting plate, and isolator fixes in one side of connecting plate and is connected with actuating mechanism, and actuating mechanism and vacuum circuit breaker all connect the control unit, and isolator and vacuum circuit breaker are connected with manual input unit respectively. The utility model has two control modes of automatic and manual operation, realizes more convenient and safe maintenance of the mine electric power, and reduces the cost of the mine underground low-voltage power distribution; the integrated structure is compact, small, safe and reliable, is convenient for line maintenance, and has an isolation function.

Description

Low-voltage vacuum circuit breaker with electric isolation for feed switch

Technical Field

The utility model relates to a mining vacuum distribution technical field in the pit, concretely relates to low pressure vacuum circuit breaker with electric isolation for feed switch.

Background

The flameproof feed switch of the low-voltage vacuum circuit breaker combination device with the isolation function is mainly responsible for power supply, power distribution and circuit protection of underground low-voltage circuits, and along with continuous improvement of mechanization and automation degree of coal mine production, electrical equipment is widely used, underground power supply capacity is continuously increased, and higher requirements are provided for reliability and safety of an underground power supply system. Along with the continuous promotion of automation level, the operation of explosion-proof electrical equipment in pit is more and more important reliable and stable, and haulage winch, band conveyer, drain pump and auxiliary ventilating fan that use in the pit motor such as are low voltage electrical equipment, and the low pressure feed switch for low voltage electrical equipment power supply is then crucial. The maintainer overhauls low voltage power supply equipment often according to standard regulation, and isolator and vacuum load switch all separately install among the current mining low voltage power supply equipment, and some distance is very far away, and is very inconvenient at the maintenance in-process, and especially vacuum circuit breaker is because its contact is in the vacuum chamber, and its on-off state can not observe, and when the contact adhesion, even vacuum circuit breaker is at the off-state, its output line also is charged state, causes dangerous accident like this easily. The underground coal mine power supply automation is an important component of intelligent mine construction, the remote power cut and transmission is a core function of the power supply automation, and if no physical isolation exists, the remote power cut and transmission does not have reliable safety guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model provides a disconnecting switch and vacuum load switch separately install or both distance are far away among the current mining low voltage power supply unit, lead to overhauing inconvenient, cause dangerous accident scheduling problem easily, the utility model provides a feed switch is with low pressure vacuum circuit breaker with electronic isolation has automatic manual two kinds of control mode, and it is more convenient, safe to realize the mining electrician maintenance, reduces the cost of mining low pressure distribution in the pit simultaneously.

In order to solve the technical problem, the utility model discloses a following technical scheme: the utility model provides a feed switch is with low pressure vacuum circuit breaker with electric isolation, includes the flame proof shell, be equipped with isolator and vacuum circuit breaker in the flame proof shell respectively, and vacuum circuit breaker's bottom is fixed on the bottom plate of flame proof shell, the top is equipped with the connecting plate, installs actuating mechanism on the connecting plate, and isolator fixes in one side of connecting plate and is connected with actuating mechanism, actuating mechanism and vacuum circuit breaker all connect control unit, and isolator and vacuum circuit breaker are connected with manual input unit respectively.

The executing mechanism comprises a bottom plate, the bottom plate is fixed on the connecting plate, a first driving assembly used for driving a main shaft of the isolating switch and a second driving assembly used for driving the first driving assembly are respectively arranged on the bottom plate, the first driving assembly is connected with the isolating switch, and the second driving assembly is connected with the first driving assembly.

The first driving assembly comprises a push rod, a screw rod and a nut seat, the push rod and the screw rod are both horizontally arranged on the nut seat, the push rod is arranged along the radial direction of the bottom plate, and the screw rod is arranged along the axial direction of the bottom plate; the push rod is connected with a main shaft of the isolating switch through a hinge piece, two ends of the screw rod are respectively and rotatably connected with the bottom plate through bearing assemblies, and the screw rod is connected with the second driving assembly; the nut seat is connected with the bottom plate in a sliding mode through the sliding assembly.

The nut seat is respectively provided with a through hole matched with the push rod and a threaded hole matched with the screw rod, the through hole and the threaded hole are arranged along the horizontal direction, the through hole is positioned above the threaded hole, and the axes of the through hole and the threaded hole are mutually vertical; the push rod penetrates through the through hole of the nut seat, the threaded hole of the nut seat is connected with a nut in an internal thread mode, and the lead screw is connected with the nut in a threaded mode.

The sliding assembly comprises a linear sliding rail, the linear sliding rail is fixed on the bottom plate and arranged along the central axis of the bottom plate, a sliding block is connected to the linear sliding rail in a sliding mode, and the sliding block is fixedly connected with the nut seat.

The second driving assembly comprises a motor, a manual input shaft, a first bevel gear, a second bevel gear and a third bevel gear, the motor is connected with the control unit, and the second bevel gear and the third bevel gear are respectively positioned on two sides of the first bevel gear and are meshed with the first bevel gear; the screw rod is fixedly connected with the first bevel gear, the output shaft of the motor is fixedly connected with the second bevel gear through a bearing assembly, the manual input shaft is fixedly connected with the third bevel gear through a bearing assembly, and the manual input shaft is connected with the manual input unit of the isolating switch.

The bearing assembly comprises a bearing and a bearing seat, the bearing is arranged on the bearing seat, and the bearing seat is fixed on the bottom plate through a support frame; the bearing assembly is provided with four groups, wherein the bearings of the two groups of bearing assemblies are respectively and rotatably connected with the two end parts of the screw rod, the bearings of the group of bearing assemblies are fixedly connected with an output shaft of the motor, and the bearings of the group of bearing assemblies are fixedly connected with the manual input shaft.

The support frame includes that first support and second support, and first support and second support are U type structure and horizontal symmetry and set up the both ends at the bottom plate, and the opening that first support and second supported sets up relatively, and bottom, the second of first support and second support all be equipped with bearing frame assorted pilot hole, the bearing frame of four groups bearing assembly is located the pilot hole that corresponds respectively.

The manual input unit of the isolating switch comprises a manual input shaft sleeve of the isolating switch, and the manual input shaft is connected with the manual input shaft sleeve of the isolating switch through two milled planes; the manual input unit of the vacuum circuit breaker comprises a manual input shaft sleeve of the circuit breaker, and the manual input shaft sleeve of the isolating switch and the manual input shaft sleeve of the circuit breaker both extend to the outside of the flameproof shell.

The isolating switch is provided with an isolating switch input wiring end and an isolating switch output wiring end respectively, the vacuum circuit breaker is provided with a circuit breaker input wiring end and a circuit breaker output wiring end respectively, the isolating switch output wiring end and the circuit breaker input wiring end are fixedly connected through bolts, the isolating switch input wiring end is connected with the input cable, and the circuit breaker output wiring end is connected with the output cable.

The utility model discloses a set up isolator and vacuum circuit breaker respectively in flame proof shell, form the low pressure vacuum circuit breaker composite set that a colliery flame proof type feed switch used and had isolation function, the switching-on and switching-off state that utilizes actuating mechanism drive isolator to control actuating mechanism and vacuum circuit breaker coordination work by the control unit or manual input unit, the realization has automation simultaneously, two kinds of manual control mode, the electric maintenance is more convenient on the ore deposit, safety, reduce the cost of mining low voltage distribution in the pit simultaneously. The utility model has the advantages of compact integral structure, small volume, safety and reliability, convenient line maintenance and isolation function.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a front view of the present invention;

fig. 3 is a left side view of the present invention;

fig. 4 is a front view of the actuator of the present invention;

FIG. 5 is a view from direction F-F of FIG. 4;

fig. 6 is a top view of the actuator of the present invention.

In the figure, 1 is a flameproof housing, 2 is a disconnecting switch, 3 is a connecting plate, 4 is an actuating mechanism, 5 is a vacuum circuit breaker, 6 is a control unit, 7 is a manual input shaft sleeve of the disconnecting switch, 8 is a manual input shaft sleeve of the circuit breaker, 9 is an input terminal of the disconnecting switch, 10 is a hinge plate, 11 is an output terminal of the disconnecting switch, 12 is an input terminal of the circuit breaker, 13 is an output terminal of the circuit breaker, 14 is a second support, 15 is a bearing, 16 is a bearing seat, 17 is a first bevel gear, 18 is a nut, 19 is a push rod, 20 is a lead screw, 21 is a first support, 22 is a sliding block, 23 is a linear sliding rail, 24 is a bottom plate, 26 is a motor, 27 is a second bevel gear, 28 is a nut seat, 29 is a manual input shaft, and 30 is a.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the utility model provides a feed switch is with low pressure vacuum circuit breaker with electric isolation, including flame proof shell 1, be equipped with isolator 2 and vacuum circuit breaker 5 in the flame proof shell 1 respectively, and vacuum circuit breaker 5's bottom is fixed on flame proof shell 1's bottom plate, top fixedly connected with connecting plate 3, and fixed mounting has actuating mechanism 4 on connecting plate 3, and isolator 2 fixes on connecting plate 3's curb plate and is connected with actuating mechanism 4, actuating mechanism 4 and vacuum circuit breaker 5 all connect control unit 6, and control unit 6 fixes the front below at flame proof shell 1 left side wall. In this embodiment, the control unit 6 may adopt a controller of STM32F103VET6 model as a "brain" of a low-voltage vacuum load circuit breaker combination device used for mining underground flameproof feeding and having an isolation function, and detect and control the coordinated work of the actuating mechanism 4, the vacuum circuit breaker 5 and the like through a signal line, and further control the on-off state of the disconnector 2 by driving the actuating mechanism 4.

As shown in fig. 4, the actuator 4 includes a bottom plate 24, the bottom plate 24 is fixed on the support plane of the connecting plate 3, the bottom plate 24 is respectively provided with a first driving assembly for driving the main shaft of the isolating switch 2 and a second driving assembly for driving the first driving assembly, the first driving assembly is connected to the isolating switch 2, and the second driving assembly is connected to the first driving assembly. The structural design realizes that the first driving component can be driven to work by the second driving component, and then the main shaft position of the isolating switch 2 is driven to change by the first driving component, so that the switching-on and switching-off states of the isolating switch 2 are controlled.

In this embodiment, as shown in fig. 5, the first driving assembly includes a push rod 19, a lead screw 20 and a nut seat 28, the push rod 19 and the lead screw 20 are both horizontally disposed on the nut seat 28, the push rod 19 is disposed along a radial direction of the bottom plate 24, and the lead screw 20 is disposed along an axial direction of the bottom plate 24. Specifically, the nut seat 28 is provided with a through hole matched with the push rod 19 and a threaded hole matched with the screw rod 20, the through hole and the threaded hole are both arranged along the horizontal direction, the through hole is positioned above the threaded hole, and the axes of the through hole and the threaded hole are mutually vertical. The push rod 19 is inserted into the through hole of the nut seat 28 and connected with the main shaft of the isolating switch 2 through the hinge piece 10, so as to drive the main shaft of the isolating switch 2 to change state. The nut 18 is connected with the threaded hole of the nut seat 28 in a threaded manner, the screw rod 20 is connected with the nut 18 in a threaded manner, the screw rod 20 is connected with the second driving assembly, two ends of the screw rod 20 are respectively connected with the bottom plate 24 in a rotating manner through bearing assemblies, and the nut seat 28 is connected with the bottom plate 24 in a sliding manner through a sliding assembly, so that the nut seat 28 can be driven to move when the screw rod 20 rotates. Further, the sliding assembly comprises a linear sliding rail 23, the linear sliding rail 23 is fixed on the bottom plate 24 and is arranged along the central axis of the bottom plate 24, a sliding block 22 is connected on the linear sliding rail 23 in a sliding manner, the sliding block 22 can freely slide back and forth on the linear sliding rail 23, the linear sliding rail 23 plays a role in guiding and bearing, and the nut seat 28 is fixedly connected with the sliding block 22. The structure realizes that the screw rod 20 can be driven to rotate under the driving of the second driving component, because the screw rod 20 is in threaded connection with the nut 18, the nut 18 is in threaded connection with the nut seat 28, and the nut seat 28 is fixedly connected with the sliding block 22, when the screw rod 20 rotates, the nut seat 28 obtains power and drives the sliding block 22 to move along the linear sliding rail 23, namely, the nut seat 28 moves along the direction of the linear sliding rail 23, so as to drive the push rod 19 to move, and the push rod 19 is used for driving the main shaft of the isolating switch 2, when the push rod 19 moves, the main shaft state of the isolating switch 2 is changed, and further, the on-off state of the isolating switch 2 is controlled.

As shown in fig. 6, the second driving assembly includes a motor 26, a manual input shaft 29, a first bevel gear 17, a second bevel gear 27 and a third bevel gear 30, the motor 26 is connected to the control unit 6, and the control unit 6 can control the start and stop of the motor 26. The second bevel gear 27 and the third bevel gear 30 are respectively located at two sides of the first bevel gear 17 and are both meshed with the first bevel gear 17, the rear part of the screw rod 20 is fixedly connected with the first bevel gear 17, and the first bevel gear 17 is used for transmitting power and changing the power direction. An output shaft of the motor 26 is fixedly connected with the second bevel gear 27 through a bearing assembly, and the second bevel gear 27 can be driven to rotate by starting the motor 26, so that the first bevel gear 17 is driven to rotate, and the screw rod 20 is driven to rotate. The manual input shaft 29 is fixedly connected with the third bevel gear 30 through a bearing assembly, the manual input shaft 29 is connected with a manual input unit of the isolating switch 2, the manual input shaft 29 is driven to rotate through the manual input unit of the isolating switch 2, and the manual input shaft 29 drives the third bevel gear 30 to rotate, so that the first bevel gear 17 is driven to rotate, and the screw rod 20 is driven to rotate. Namely, two control modes of automatic switching on and switching off of the isolating switch 2 are realized.

In this embodiment, the bearing assembly includes a bearing 15 and a bearing seat 16, the bearing 15 is disposed on the bearing seat 16, and the bearing seat 16 is fixed on the bottom plate 24 by a support frame. The support frame include first support 21 and second support 14, preferably first support 21 and second support 14 are U type structure and horizontal symmetry sets up the both ends at bottom plate 24, and the both sides bottom of first support 21 and second support 14 all is equipped with the hem, and first support 21 and second support 14 are fixed on bottom plate 24 through the hem that corresponds respectively. The openings of the first support 21 and the second support 14 are oppositely arranged, and two ends of the linear slide rail 23 are respectively positioned in the frame of the U-shaped structure of the first support 21 and the second support 14, so as to facilitate the assembly of each driving component. Further, the bearing assemblies are provided with four groups, wherein the bearings 15 of the two groups of bearing assemblies are respectively and rotatably connected with two end portions of the screw rod 20, the bearings 15 of the one group of bearing assemblies are fixedly connected with an output shaft of the motor 26, the bearings 15 of the one group of bearing assemblies are fixedly connected with a manual input shaft 29, assembling holes matched with the bearing seats 16 are respectively formed in the bottoms of the first support 21 and the second support 14 and two side portions of the second support 14, and the bearing seats 16 of the four groups of bearing assemblies are respectively located in the corresponding assembling holes.

The isolating switch 2 and the vacuum circuit breaker 5 are respectively connected with respective manual input units. The manual input unit of the isolating switch 2 comprises an isolating switch manual input shaft sleeve 7, and the manual input shaft 29 is fixedly connected with the isolating switch manual input shaft sleeve 7 through two milled planes. The manual input unit of the vacuum circuit breaker 5 comprises a breaker manual input bushing 8. The isolating switch manual input shaft sleeve 7 and the breaker manual input shaft sleeve 8 both penetrate through the right side wall of the explosion-proof shell 1 and extend to the outside of the explosion-proof shell 1, and manual operation is facilitated.

The isolating switch 2 and the vacuum circuit breaker 5 are both provided with automatic and manual control modes, wherein the isolating switch automatically closes and opens the brake power transmission line: the motor 26 → the second bevel gear 27 → the first bevel gear 17 → the lead screw 20 → the nut 18 → the nut seat 28 → the push rod 19 → the hinge plate 10 → the main shaft of the isolating switch 2, that is, the motor 26 is started by the control unit 6, the output shaft of the motor 26 drives the second bevel gear 27 to rotate, the second bevel gear 27 drives the first bevel gear 17 to synchronously rotate, the first bevel gear 17 drives the lead screw 20 to rotate, and when the lead screw 20 rotates, the nut seat 28 moves along the direction of the linear slide rail 23, so as to drive the push rod 19 to move, further drive the main shaft of the isolating switch 2 to change the state, and realize the control of the closing and opening states of the. The manual closing and opening power transmission route of the isolating switch is as follows: the manual input shaft sleeve 7 of the isolating switch → the manual input shaft 29 → the third bevel gear 30 → the first bevel gear 17 → the screw rod 20 → the nut 18 → the nut seat 28 → the push rod 19 → the hinge plate 10 → the main shaft of the isolating switch 2, namely, the manual input shaft sleeve 7 of the isolating switch drives the manual input shaft 29 to rotate, the manual input shaft 29 drives the third bevel gear 30 to rotate, the third bevel gear 30 drives the first bevel gear 17 to synchronously rotate, the first bevel gear 17 drives the screw rod 20 to rotate, and finally drives the push rod 19 to move, so that the state of the main shaft of the isolating switch 2 is changed, and the closing and opening states of the isolating switch 2 are controlled. The automatic control of the vacuum interrupter 5 is performed by the control unit 6, and the manual control is performed by the interrupter manual input bushing 8. This embodiment is through setting up automatic, two kinds of control mode of manual, realizes that the electrician maintains more conveniently, safety on the ore deposit, reduces the cost of mining low pressure distribution in the pit simultaneously, "getting through the last kilometer" for wisdom mine construction.

Isolator 2 is last to be equipped with isolator input wiring end 9 and isolator output wiring end 11 respectively, is equipped with circuit breaker input wiring end 12 and circuit breaker output wiring end 13 on the vacuum circuit breaker 5 respectively, and isolator output wiring end 11 and circuit breaker input wiring end 12 pass through bolt fixed connection, and isolator input wiring end 9 is connected with input cable, and circuit breaker output wiring end 13 is connected with output cable, promptly the utility model discloses a power transmission route map does: input cable → disconnector input terminal 9 → blade of disconnector 2 → disconnector output terminal 11 → breaker input terminal 12 → vacuum breaker 5 → breaker output terminal 13 → output cable.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a feed switch is with low pressure vacuum circuit breaker with electric isolation, includes flame proof shell (1), its characterized in that: the explosion-proof shell is characterized in that a disconnecting switch (2) and a vacuum circuit breaker (5) are arranged in the explosion-proof shell (1) respectively, the bottom of the vacuum circuit breaker (5) is fixed on a bottom plate of the explosion-proof shell (1), a connecting plate (3) is arranged at the top of the explosion-proof shell, an executing mechanism (4) is installed on the connecting plate (3), the disconnecting switch (2) is fixed on one side of the connecting plate (3) and is connected with the executing mechanism (4), the executing mechanism (4) and the vacuum circuit breaker (5) are connected with a control unit (6) respectively, and the disconnecting switch (2) and the vacuum circuit breaker (5) are connected.

2. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 1, characterized in that: the actuating mechanism (4) comprises a bottom plate (24), the bottom plate (24) is fixed on the connecting plate (3), a first driving assembly used for driving a main shaft of the isolating switch (2) and a second driving assembly used for driving the first driving assembly are respectively arranged on the bottom plate (24), the first driving assembly is connected with the isolating switch (2), and the second driving assembly is connected with the first driving assembly.

3. A low-voltage vacuum circuit breaker with galvanic isolation for a feed switch according to claim 2, characterized in that: the first driving assembly comprises a push rod (19), a screw rod (20) and a nut seat (28), the push rod (19) and the screw rod (20) are horizontally arranged on the nut seat (28), the push rod (19) is arranged along the radial direction of the bottom plate (24), and the screw rod (20) is arranged along the axial direction of the bottom plate (24); the push rod (19) is connected with a main shaft of the isolating switch (2) through a hinge piece (10), two ends of the screw rod (20) are respectively and rotatably connected with the bottom plate (24) through bearing assemblies, and the screw rod (20) is connected with the second driving assembly; the nut seat (28) is connected with the bottom plate (24) in a sliding mode through a sliding assembly.

4. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 3, characterized in that: the nut seat (28) is respectively provided with a through hole matched with the push rod (19) and a threaded hole matched with the screw rod (20), the through hole and the threaded hole are arranged along the horizontal direction, the through hole is positioned above the threaded hole, and the axes of the through hole and the threaded hole are mutually vertical; the push rod (19) penetrates through a through hole of the nut seat (28), a nut (18) is connected with the threaded hole of the nut seat (28) in an internal thread mode, and the screw rod (20) is connected with the nut (18) in a threaded mode.

5. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 3, characterized in that: the sliding assembly comprises a linear sliding rail (23), the linear sliding rail (23) is fixed on the bottom plate (24) and arranged along the central axis of the bottom plate (24), a sliding block (22) is connected to the linear sliding rail (23) in a sliding mode, and the sliding block (22) is fixedly connected with the nut seat (28).

6. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 3 or 5, characterized in that: the second driving assembly comprises a motor (26), a manual input shaft (29), a first bevel gear (17), a second bevel gear (27) and a third bevel gear (30), the motor (26) is connected with the control unit (6), and the second bevel gear (27) and the third bevel gear (30) are respectively positioned on two sides of the first bevel gear (17) and are meshed with the first bevel gear (17); the screw rod (20) is fixedly connected with the first bevel gear (17), an output shaft of the motor (26) is fixedly connected with the second bevel gear (27) through a bearing assembly, the manual input shaft (29) is fixedly connected with the third bevel gear (30) through a bearing assembly, and the manual input shaft (29) is connected with a manual input unit of the isolating switch (2).

7. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 6, characterized in that: the bearing assembly comprises a bearing (15) and a bearing seat (16), the bearing (15) is arranged on the bearing seat (16), and the bearing seat (16) is fixed on a bottom plate (24) through a supporting frame; the bearing assembly is provided with four groups, wherein the bearings (15) of the two groups of bearing assemblies are respectively and rotatably connected with two ends of the screw rod (20), the bearings (15) of the one group of bearing assemblies are fixedly connected with an output shaft of the motor (26), and the bearings (15) of the one group of bearing assemblies are fixedly connected with a manual input shaft (29).

8. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 7, characterized in that: the support frame includes that first support (21) and second support (14), first support (21) and second support (14) are U type structure and horizontal symmetry and set up the both ends at bottom plate (24), the opening of first support (21) and second support (14) sets up relatively, and the bottom of first support (21) and second support (14), two lateral parts of second support (14) all are equipped with the assembly hole with bearing frame (16) assorted, bearing frame (16) of four groups of bearing assemblies are located the assembly hole that corresponds respectively.

9. A low-voltage vacuum circuit breaker with galvanic isolation for a feeder switch according to claim 6, characterized in that: the manual input unit of the isolating switch (2) comprises an isolating switch manual input shaft sleeve (7), and the manual input shaft (29) is connected with the isolating switch manual input shaft sleeve (7) through two milled planes; the manual input unit of the vacuum circuit breaker (5) comprises a circuit breaker manual input shaft sleeve (8), and the isolating switch manual input shaft sleeve (7) and the circuit breaker manual input shaft sleeve (8) both extend to the outside of the flameproof shell (1).

10. The low-voltage vacuum circuit breaker with electric isolation for feed switch according to any one of claims 1 to 5, 7, 8, 9, characterized in that: isolator (2) are last to be equipped with isolator input wiring end (9) and isolator output wiring end (11) respectively, are equipped with circuit breaker input wiring end (12) and circuit breaker output wiring end (13) on vacuum circuit breaker (5) respectively, and isolator output wiring end (11) and circuit breaker input wiring end (12) pass through bolt fixed connection, and isolator input wiring end (9) are connected with input cable, and circuit breaker output wiring end (13) are connected with output cable.