CN113471011A

CN113471011A - Outdoor vacuum circuit breaker with built-in isolating switch

Info

Publication number: CN113471011A
Application number: CN202110690552.XA
Authority: CN
Inventors: 苏杭; 郭灿; 李志雄
Original assignee: Junlang Electric Co ltd
Current assignee: Junlang Electric Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-10-01

Abstract

The invention discloses an outdoor vacuum circuit breaker with an internally-arranged isolating switch, which comprises a box body, a first sleeve, a second sleeve, a vacuum arc extinguish chamber and the isolating switch, wherein the first sleeve is arranged on the box body; the first sleeve and the second sleeve are respectively arranged on two opposite sides of the box body, an insulating box is fixed in the box body, the isolating switch and the vacuum arc-extinguishing chamber are arranged in different cavities on the insulating box, and a first conductor, a second conductor, a third conductor and the vacuum arc-extinguishing chamber are fixed in the insulating box in an injection molding manner; the vertical setting of vacuum interrupter, the fixed conducting rod lower extreme of the interior lower part of vacuum interrupter links to each other with the third conductor is fixed, and the movable conducting rod outer end of the interior one end of vacuum interrupter is connected with first conductor through the flexible coupling conductor, keeps apart the sword and rotates and install on the third conductor, touches the tool holder and connect on the second conductor, and the top of box internal insulation box is equipped with first actuating mechanism and second actuating mechanism. The outdoor vacuum circuit breaker is reasonable in structure, convenient to assemble through optimized design, beneficial to improving the production efficiency and good in product use stability.

Description

Outdoor vacuum circuit breaker with built-in isolating switch

Technical Field

The invention relates to an outdoor vacuum circuit breaker with an internally-arranged isolating switch, belonging to the field of structural design of high-voltage circuit breakers.

Background

The outdoor vacuum circuit breaker plays a key role in an intelligent distribution network. Some outdoor vacuum circuit breakers on the market are generally externally provided with isolating switches, the outdoor vacuum circuit breaker is large in size, and the isolating switches are externally arranged, so that the outdoor vacuum circuit breaker is easily influenced by salt mist, humidity and the like, and the switching-on and switching-off performance of switch equipment is further influenced. To this kind of situation, also appeared in the market at present with the built-in outdoor vacuum circuit breaker of isolator, eliminated the outside outdoor vacuum circuit breaker of isolator and had not enough from this, however this kind of built-in outdoor vacuum circuit breaker of isolator also has not enough, need will constitute isolator's part, vacuum interrupter and internal conductor part fixed mounting respectively when the equipment, this kind of installation can bring a great deal of inconvenience in the operation of the relatively narrow and small box inner space.

Disclosure of Invention

In view of the above, the present invention is directed to provide an outdoor vacuum circuit breaker with an internal disconnecting switch, which is convenient to assemble and produce.

The technical scheme for realizing the purpose of the invention is as follows:

an outdoor vacuum circuit breaker with an internally-arranged isolating switch comprises a box body, a first sleeve, a second sleeve, a vacuum arc extinguish chamber and the isolating switch;

the first sleeve and the second sleeve are respectively arranged on two opposite sides of the box body, an insulating box is fixed in the box body, the isolating switch and the vacuum arc-extinguishing chamber are installed in different cavities on the insulating box, and a first conductor electrically connected with the first sleeve inner conductor, a second conductor electrically connected with the second sleeve inner conductor, a third conductor positioned between the isolating switch and the vacuum arc-extinguishing chamber are fixed in the insulating box in an injection molding manner;

vacuum interrupter is vertical setting, the quiet conducting rod of the interior one end of vacuum interrupter with the third conductor is fixed continuous, the moving conducting rod outer end of the interior one end of vacuum interrupter pass through the flexible coupling conductor with first conductor is connected, isolation sword in the isolator rotates and installs on the third conductor, in the isolator with isolation sword complex touches the tool rest and connects on the second conductor be equipped with the drive in the box isolation sword pivoted first actuating mechanism and drive move the second actuating mechanism that the conducting rod reciprocated.

In the above technical scheme, first actuating mechanism sets up including rotating first drive pivot on the box and connecting first drive pivot with keep apart the first linkage subassembly of sword, external drive the sword rotation is kept apart in the drive of first drive pivot through first linkage subassembly drive during rotation, in order with the contact blade seat contacts or separates.

In the technical scheme, the first linkage assembly comprises a first crank arm fixed on the first driving rotating shaft and an insulating connecting plate, two ends of the insulating connecting plate are respectively and movably connected with the first crank arm and a fixing plate through a connecting shaft, and the fixing plate is fixed on the isolating knife;

the shaping has fixed trepanning and first spacing slot on the first connecting lever, fixed trepanning with the locking screw locking is passed through after first drive pivot cup joints, insulating even board one end is suitable for and inserts in the first spacing slot and through a connecting axle through connection, insulating even is equipped with the spacing slot of second on the other end of board, fixed plate one end is suitable for and inserts in the spacing slot of second and through another connecting axle through connection.

In the above technical solution, the second driving mechanism includes a second driving rotating shaft rotatably disposed on the box body and a second linkage assembly connecting the second driving rotating shaft and the movable conducting rod, and the movable conducting rod is driven by the second linkage assembly to move up and down when the second driving rotating shaft is driven to rotate by an external force, so as to contact with or separate from the static conducting rod; the second linkage assembly comprises a second crank arm fixed on the second driving rotating shaft and an insulating pull rod, wherein two ends of the insulating pull rod are respectively connected with the second crank arm and the movable conducting rod.

In the technical scheme, the insulating pull rod comprises an insulating shell, a first pull rod insert, a second pull rod insert, a movable connecting rod, a limiting sleeve and a pressure spring, wherein the first pull rod insert is fixed at one end of the insulating shell in an injection molding mode and is connected with the movable conducting rod, the second pull rod insert is fixed at the other end of the insulating shell in an injection molding mode, the movable connecting rod is arranged in the second pull rod insert in an up-and-down mode, the end portion of the second pull rod insert is used for limiting the movable connecting rod in the second pull rod insert, the pressure spring is arranged in the second pull rod insert and provides outward elastic force for the movable connecting rod, the movable connecting rod movably penetrates through the limiting sleeve, a blocking step which is abutted against the inner end of the limiting sleeve is arranged on the movable connecting rod, and the outer end of the movable connecting rod is connected with the second crank arm through a connecting rod.

In the technical scheme, the limiting sleeve is fixed on the second pull rod insert in a threaded connection mode.

In the technical scheme, a limit baffle is fixed at the position of the contact cutter seat in the insulating box, and the isolation cutter is abutted against the limit baffle when the isolation cutter is matched with the contact cutter seat.

In the above technical scheme, the contact base and the second conductor are integrally formed.

In the technical scheme, a separation wall is formed between the vacuum arc extinguish chamber and the isolating switch in the insulating box.

In the technical scheme, an oil buffer is fixed in the box body, a buffering crank arm is fixed at a position, close to the oil buffer, on the second driving rotating shaft, a roller is fixed on the buffering crank arm, and the second driving rotating shaft drives the roller to press a piston rod on the oil buffer in the brake opening process of the vacuum arc extinguish chamber.

In the above technical scheme, a first insulating plug bush and a second insulating plug bush respectively covering the first conductor and the second conductor are integrally formed on the outer portion of the insulating box, the outer end of the first conductor extends out of the first insulating plug bush, a first contact in plug-in fit with the first sleeve inner conductor is arranged at the end of the first conductor, the inner end of the first sleeve extends into the box body and is provided with a first plug cylinder in plug-in fit with the first insulating plug bush, the outer end of the second conductor extends out of the second insulating plug bush, a second contact in plug-in fit with the second sleeve inner conductor is arranged at the end of the second conductor, the inner end of the second sleeve extends into the box body and is provided with a second plug cylinder in plug-in fit with the first insulating plug bush, and sealing rings are compressed between the first insulating plug bush and the first plug cylinder and between the first insulating plug bush and the second plug cylinder.

The invention has the positive effects that: according to the invention, the insulation box is fixed in the box body, and the isolating switch and the vacuum arc-extinguishing chamber are arranged in different cavities on the insulation box, so that the isolating switch and the vacuum arc-extinguishing chamber keep a relatively large distance in space, and the safety is ensured, and further, the first conductor, the second conductor, the third conductor and the vacuum arc-extinguishing chamber are integrally injected on the insulation box, so that the subsequent assembly processes are reduced.

Drawings

Fig. 1 is a perspective view of an outdoor vacuum circuit breaker according to the present invention;

fig. 2 is a bottom view of the outdoor vacuum circuit breaker of fig. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of FIG. 3 at B;

fig. 5 is a structural view of a first linkage assembly according to the present invention.

The reference symbols shown in the figures are: 1-a box body; 2-a first sleeve; 3-a second sleeve; 4-a vacuum arc-extinguishing chamber; 5-an isolating switch; 6-an insulating box; 7-a first conductor; 8-a second conductor; 9-a third conductor; 10-an isolation knife; 11-a contact holder; 12-a first drive shaft; 13-a first crank arm; 130-a fixed plate; 131-fixed trepanning; 132-a first spacing slot; 133-locking screws; 14-insulating connecting plates; 141-a second limit slot; 15-a second drive shaft; 16-a second drive mechanism; 17-a flexible connection conductor; 18-an insulating tie rod; 19-a second crank arm; 20-an insulating housing; 21-a first tie rod insert; 22-a second tie rod insert; 23-a movable connecting rod; 231-a resisting step; 24-a pressure spring; 25-a limit sleeve; 26-a tie rod; 27-a limit baffle; 28-partition walls; 29-oil buffer; 30-buffer crank arm; 31-a roller; 32-a piston rod; 33-a first insulating sleeve; 34-a second insulating sleeve; 35-a first contact; 36-a first cartridge; 37-a second contact; 38-a second cartridge; 39-third crank arm.

Detailed Description

The following description is made in conjunction with the accompanying drawings for describing the specific structure of the outdoor vacuum circuit breaker of the present invention:

an outdoor vacuum circuit breaker with built-in isolating switch is shown in figures 1 to 4 and comprises a box body 1, a first sleeve 2, a second sleeve 3, a vacuum arc-extinguishing chamber 4 and an isolating switch 5; the first sleeve 2 and the second sleeve 3 are respectively arranged on two opposite sides of the box body 1, an insulating box 6 is fixed in the box body 1, the isolating switch 5 and the vacuum arc-extinguishing chamber 4 are installed in different cavities on the insulating box 6, and a first conductor 7 electrically connected with an inner conductor of the first sleeve 2, a second conductor 8 electrically connected with an inner conductor of the second sleeve 3, a third conductor 9 between the isolating switch 5 and the vacuum arc-extinguishing chamber 4 are fixed in the insulating box 6 by injection molding; vacuum interrupter 4 is vertical setting, the quiet conducting rod of one end in the vacuum interrupter 4 with third conductor 9 is fixed continuous, the moving conducting rod outer end of one end in the vacuum interrupter 4 pass through flexible coupling conductor 17 with first conductor 7 is connected, isolator 10 in 5 rotates and installs on the third conductor 9, in isolator 5 with isolator 10 complex touches the tool holder 11 and connects on the second conductor 8 be equipped with the drive in the box 1 isolator 10 pivoted first actuating mechanism and drive move second actuating mechanism 16 that the conducting rod reciprocated. Through at box 1 internal fixation insulating box 6 in this embodiment to set up isolator 5 and vacuum interrupter 4 in the different cavities on insulating box 6, make isolator 5 and vacuum interrupter 4 keep great distance relatively in the space, guarantee the security, and further first conductor 7, second conductor 8, third conductor 9 and vacuum interrupter 4 an organic whole mould plastics on insulating box 6, thereby reduce subsequent equipment process, when assembling outdoor vacuum circuit breaker, can accomplish first after the assembly of relevant part on insulating box 6 in the outside, fix insulating box 6 is whole to be arranged in box 1 again, thereby be convenient for assembly production more.

In this embodiment, the first driving mechanism includes a first driving shaft 12 rotatably disposed on the box body 1 and a first linkage assembly connecting the first driving shaft 12 and the isolation knife 10, and when the first driving shaft 12 is driven to rotate by an external force, the isolation knife 10 is driven to rotate by the first linkage assembly so as to contact with or separate from the contact knife holder 11; when the isolating switch is switched on and off, the first driving rotating shaft 12 is driven to rotate by the driving mechanism outside the box body 1, and when the first driving rotating shaft 12 rotates, the isolating knife 10 is driven to perform on-off action by the first linkage component. As a further improvement, referring to fig. 5, the first linkage assembly includes a first crank arm 13 fixed on the first driving shaft 12 and an insulating connecting plate 14 having two ends respectively movably connected to the first crank arm 13 and a fixing plate 130 through a connecting shaft, and the fixing plate 130 is fixed on the isolating knife 10; first turning arm 13 goes up the shaping and has fixed trepanning 131 and first spacing slot 132, fixed trepanning 131 with first drive pivot 12 is cup jointed back and is locked through locking screw 133 to fix first turning arm 13 on first drive pivot 12, insulating even board 14 one end is suitable for inserting in first spacing slot 132 and through a connecting axle through connection, be equipped with second spacing slot 141 on insulating even board 14's the other end, fixed plate 130 one end is suitable for inserting in the spacing slot 141 of second and through another connecting axle through connection, and the first linkage subassembly that adopts above-mentioned structure to make is connected stability well, through first spacing slot 132 and insulating even board 14 one end adaptation grafting, fixed plate 130 one end and the spacing slot 141 adaptation grafting of second, so the joint is in the axis direction of connecting axle can be effectively spacing, thereby the effort that produces when first drive pivot 12 rotates can be through first turning arm 13, The insulating link plate 14 and the fixing plate 130 are effectively transferred to the isolating blade 10.

Further, the second driving mechanism 16 includes a second driving rotating shaft 15 rotatably disposed on the box body 1 and a second linkage assembly connecting the second driving rotating shaft 15 and the movable conducting rod, and when the second driving rotating shaft 15 is driven to rotate by external force, the movable conducting rod is driven to move up and down by the second linkage assembly so as to be in contact with or separated from the static conducting rod; the second linkage assembly comprises a second connecting lever 19 fixed on the second driving rotating shaft 15 and an insulating pull rod 18 with two ends connected with the second connecting lever 19 and the movable conducting rod respectively, the second connecting lever 19 is driven by a driving mechanism outside the box body 1 when the second driving rotating shaft 15 rotates, the second connecting lever 19 is driven to rotate, and then the movable conducting rod is driven by the insulating pull rod 18 to move up and down so as to control the switching-on and switching-off of the interior of the vacuum arc extinguish chamber 4.

As an implementation manner of this embodiment, referring to fig. 3 and 4 in particular, the insulating pull rod 18 includes an insulating housing 20, a first pull rod insert 21 injection-molded and fixed at one end of the insulating housing 20 and connected to the movable conductive rod, a second pull rod insert 22 injection-molded and fixed at the other end of the insulating housing 20, a movable connecting rod 23 movably disposed in the second pull rod insert 22 up and down, a position-limiting sleeve 25 fixed at an end of the second pull rod insert 22 for limiting the movable connecting rod 23 in the second pull rod insert 22, and a pressure spring 24 disposed in the second pull rod insert 22 for providing an outward elastic force to the movable connecting rod 23, wherein the movable connecting rod 23 movably penetrates through the position-limiting sleeve 25, and a resisting step 231 which is butted against the inner end of the limit sleeve 25 is arranged on the movable connecting rod 23, and the outer end of the movable connecting rod 23 is connected with the second crank arm 19 through a connecting rod 26.

The insulating pull rod 18 has elasticity, and when the switch-on inside of the vacuum arc-extinguishing chamber is controlled (namely, when the movable and static conducting rods are contacted), the insulating pull rod 18 expands and contracts axially to perform elastic buffering, so that the movable and static conducting rods are protected to a certain extent.

In this embodiment, the stop collar 25 is fixed to the second tie rod insert 22 through a screw connection mode, and in actual operation, the stop collar 25 can be fixed to the second tie rod insert 22 through a welding mode, and the screw connection mode has the advantage that the pretightening force of the pressure spring can be adjusted through adjusting the matching depth of the stop collar 25 and the second tie rod insert 22 according to needs during assembly.

In this embodiment, a limit baffle 27 is fixed at the position of the contact holder 11 in the insulating box 6, the isolation knife 10 is abutted to the limit baffle 27 when being matched with the contact holder 11, and when the isolation knife 10 is driven by the first driving mechanism to rotate to the closing position, namely, to be contacted with the contact holder 11, the isolation knife 10 is limited in the stop position by the abutment of the limit baffle 27 and the isolation knife 10, so that the contact reliability of the isolation knife 10 and the contact holder 11 is ensured.

In this embodiment, the contact holder 11 and the second conductor 8 are integrally formed, so that the number of parts is reduced, and the assembly process is reduced.

In this embodiment, a separation wall 28 is formed between the vacuum arc-extinguishing chamber 4 and the disconnecting switch 5 in the insulating box 6, and the separation is strengthened by the separation wall 28, so that the safety is ensured.

Further, 1 internal fixation of box has oil buffer 29, be close to in the second drive pivot 15 oil buffer 29's rigidity has buffering connecting lever 30, be fixed with roller 31 on the buffering connecting lever 30, second drive pivot 15 drives 4 separating brake in-process of vacuum interrupter roller 31 supports and presses piston rod 32 on the oil buffer 29, when control second drive pivot 15 rotates and drives vacuum interrupter separating brake, thereby it conflicts with piston rod 32 on the oil buffer to play the damping cushioning effect through roller 31 when buffering connecting lever 30 rotates, avoids relevant part to cause the trouble because of the violent collision.

In this embodiment, a first insulating sleeve 33 and a second insulating sleeve 34 respectively covering the first conductor 7 and the second conductor 8 are integrally formed on the outer portion of the insulating box 6, the outer end of the first conductor 7 extends out of the first insulating sleeve 33 and is provided with a first contact 35 at the end for plugging and matching with the conductor in the first sleeve 2, the inner end of the first sleeve 2 extends into the box body 1 and is provided with a first plug barrel 36 which is in plug fit with the first insulating plug bush 33, the outer end of the second conductor 8 extends out of the second insulating sleeve 34 and is provided with a second contact 37 at the end for plugging and matching with the conductor in the second sleeve 3, the inner end of the second sleeve 3 extends into the box body 1 and is provided with a second plug 38 which is in plug fit with the first insulating plug 33, sealing rings are pressed between the first insulating plug bush 33 and the first plug cylinder 36 and between the first insulating plug bush 33 and the second plug cylinder 39; in the embodiment, the first contact 35 is inserted into the conductor in the first sleeve 2, and the second contact is inserted into the conductor in the second sleeve 3 to form connection, so that the connection is fast and the assembly is convenient, on the basis, the first insertion tube 36 is inserted into the first insulating insertion sleeve 33 to be matched, and the second insertion tube 38 is matched with the second insulating insertion sleeve 33 to achieve a good insulating protection effect; the gap is blocked and a possible creepage path is blocked by compressing the sealing ring, so that the safety is improved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.

Claims

1. An outdoor vacuum circuit breaker with an internally-arranged isolating switch comprises a box body (1), a first sleeve (2), a second sleeve (3), a vacuum arc-extinguishing chamber (4) and the isolating switch (5); it is characterized in that the preparation method is characterized in that,

the first sleeve (2) and the second sleeve (3) are respectively arranged on two opposite sides of the box body (1), an insulating box (6) is fixed in the box body (1), the isolating switch (5) and the vacuum arc-extinguishing chamber (4) are installed in different cavities on the insulating box (6), and a first conductor (7) electrically connected with an inner conductor of the first sleeve (2), a second conductor (8) electrically connected with an inner conductor of the second sleeve (3), a third conductor (9) between the isolating switch (5) and the vacuum arc-extinguishing chamber (4) are fixed in the insulating box (6) through injection molding;

vacuum interrupter (4) are vertical setting, the quiet conducting rod of one end in vacuum interrupter (4) with third conductor (9) are fixed continuous, the moving conducting rod outer end of one end in vacuum interrupter (4) pass through flexible coupling conductor (17) with first conductor (7) are connected, isolation sword (10) in isolator (5) rotate to be installed on third conductor (9), in isolator (5) with isolation sword (10) complex touches blade holder (11) and connects on second conductor (8) be equipped with the drive in box (1) isolation sword (10) pivoted first actuating mechanism and drive move second actuating mechanism (16) that the conducting rod reciprocated.

2. The outdoor vacuum circuit breaker with built-in isolating switch as claimed in claim 1, wherein said first driving mechanism comprises a first driving shaft (12) rotatably disposed on said box (1) and a first linkage assembly connecting said first driving shaft (12) and said isolating blade (10), and when said first driving shaft (12) is driven by external force to rotate, said isolating blade (10) is driven by said first linkage assembly to rotate so as to contact with or separate from said contact blade seat (11).

3. The outdoor vacuum circuit breaker with built-in isolating switch as claimed in claim 1, wherein the first linkage assembly comprises a first crank arm (13) fixed on the first driving rotating shaft (12) and an insulating connecting plate (14) with two ends respectively movably connecting the first crank arm (13) and a fixing plate (130) through connecting shafts, the fixing plate (130) is fixed on the isolating knife (10);

first crank arm (13) are gone up the shaping and are had fixed trepanning (131) and first spacing slot (132), fixed trepanning (131) with first drive pivot (12) lock through locking screw (133) after cup jointing, insulating even board (14) one end is suitable for inserting in first spacing slot (132) and through a connecting axle through connection, insulating even is equipped with spacing slot (141) of second on the other end of board (14), fixed plate (130) one end is suitable for inserting in the spacing slot (141) of second and through another connecting axle through connection.

4. The outdoor vacuum circuit breaker with built-in isolating switch according to claim 1, characterized in that the second driving mechanism (16) comprises a second driving rotating shaft (15) rotatably disposed on the box body (1) and a second linkage assembly connecting the second driving rotating shaft (15) and the movable conducting rod, and when the second driving rotating shaft (15) is driven by external force to rotate, the movable conducting rod is driven by the second linkage assembly to move up and down so as to be in contact with or separate from the static conducting rod; the second linkage assembly comprises a second crank arm (19) fixed on the second driving rotating shaft (15) and an insulating pull rod (18) of which two ends are respectively connected with the second crank arm (19) and the movable conducting rod.

5. The outdoor vacuum circuit breaker of claim 4, wherein said insulating tie bar (18) comprises an insulating housing (20), a first tie bar insert (21) injection-molded and fixed at one end of said insulating housing (20) and connected to said movable conductive bar, a second tie bar insert (22) injection-molded and fixed at the other end of said insulating housing (20), a movable connecting rod (23) movably disposed in said second tie bar insert (22) up and down, a position-limiting sleeve (25) fixed at the end of said second tie bar insert (22) for limiting said movable connecting rod (23) in said second tie bar insert (22), and a pressure spring (24) disposed in said second tie bar insert (22) for providing an outward elastic force to said movable connecting rod (23), said movable connecting rod (23) movably penetrates said position-limiting sleeve (25), and a resisting step (231) which is abutted against the inner end of the limiting sleeve (25) is arranged on the movable connecting rod (23), and the outer end of the movable connecting rod (23) is connected with the second crank arm (19) through a connecting rod (26).

6. An outdoor vacuum circuit breaker with built-in disconnecting switch according to claim 5, characterized in that the limiting sleeve (25) is fixed to the second tie rod insert (22) by means of a screw connection.

7. An outdoor vacuum circuit breaker with built-in isolating switch according to claim 1, characterized in that a limit stop (27) is fixed in the insulating box (6) at the contact holder (11), and the isolating blade (10) abuts against the limit stop (27) when being matched with the contact holder (11).

8. An outdoor vacuum circuit breaker with built-in disconnector according to claim 1, characterized in that the contact holder (11) is formed integrally with the second conductor (8).

9. An outdoor vacuum circuit breaker with built-in disconnector according to claim 1, characterized in that a partition wall (28) is formed in the insulating box (6) between the vacuum interrupter (4) and the disconnector (5).

10. The outdoor vacuum circuit breaker with the built-in disconnecting switch according to claim 1, wherein an oil buffer (29) is fixed in the box body (1), a buffering crank arm (30) is fixed on the second driving rotating shaft (15) at a position close to the oil buffer (29), a roller (31) is fixed on the buffering crank arm (30), and the roller (31) is pressed against a piston rod (32) on the oil buffer (29) in the process that the second driving rotating shaft (15) drives the vacuum arc-extinguishing chamber (4) to open the brake.

11. The outdoor vacuum circuit breaker with built-in isolating switch according to claim 1, characterized in that the insulating box (6) is integrally formed with a first insulating sleeve (33) and a second insulating sleeve (34) at the outside thereof for respectively covering the first conductor (7) and the second conductor (8), the outer end of the first conductor (7) extends out of the first insulating sleeve (33) and is provided at the end with a first contact (35) in plug-fit with the inner conductor of the first bushing (2), the inner end of the first bushing (2) extends into the box (1) and is provided with a first barrel (36) in plug-fit with the first insulating sleeve (33), the outer end of the second conductor (8) extends out of the second insulating sleeve (34) and is provided at the end with a second contact (37) in plug-fit with the inner conductor of the second bushing (3), and the inner end of the second bushing (3) extends into the box (1) and is provided with the first insulating sleeve (33) ) And a second insert cylinder (38) is inserted and matched, and sealing rings are compressed between the first insulating insert sleeve (33) and the first insert cylinder (36) and between the first insulating insert sleeve (33) and the second insert cylinder (39).