Isolating switch built-in outdoor vacuum circuit breaker

Abstract

The present invention discloses an outdoor vacuum circuit breaker with a built-in isolating switch, comprising a housing, a first sleeve, a second sleeve, a vacuum interrupter, and an isolating switch; the first sleeve and the second sleeve are respectively arranged on opposite sides of the housing, an insulating box is fixed in the housing, the isolating switch and the vacuum interrupter are installed in different chambers on the insulating box, and a first conductor, a second conductor, a third conductor, and the vacuum interrupter are injection-molded and fixed in the insulating box; the vacuum interrupter is arranged vertically, the lower end of the static conductive rod in the lower part of the vacuum interrupter is fixedly connected to the third conductor, the outer end of the dynamic conductive rod at one end of the vacuum interrupter is connected to the first conductor via a flexible connecting conductor, the isolating knife is rotatably mounted on the third conductor, the contact knife seat is connected to the second conductor, and a first drive mechanism and a second drive mechanism are provided above the insulating box in the housing. The outdoor vacuum circuit breaker of the present invention has a reasonable structure, an optimized design, is easy to assemble, is conducive to improving production efficiency, and has good product stability.

Description

Technical Field

[0001] The invention relates to an outdoor vacuum circuit breaker with built-in isolating switch, and belongs to the field of high-voltage circuit breaker structure design. Background Art

[0002] Outdoor vacuum circuit breakers play a key role in smart distribution networks. Some existing outdoor vacuum circuit breakers on the market typically have an external disconnector. These are relatively large, and because the disconnector is external, they are susceptible to salt spray, moisture, and other factors, which can affect the switching performance of the switchgear. To address this issue, outdoor vacuum circuit breakers with built-in disconnectors are now available on the market, eliminating the shortcomings of outdoor vacuum circuit breakers with external disconnectors. However, these types of outdoor vacuum circuit breakers with built-in disconnectors also have shortcomings. During assembly, the components that make up the disconnector, the vacuum interrupter, and the internal conductor components must be fixed and installed separately. This installation in the relatively narrow space inside the box can cause many inconveniences. Summary of the Invention

[0003] To this end, the present invention aims to provide an outdoor vacuum circuit breaker with a built-in isolating switch that is easy to assemble and produce.

[0004] The technical solution for achieving the purpose of the present invention is:

[0005] An outdoor vacuum circuit breaker with a built-in isolating switch, comprising a box, a first bushing, a second bushing, a vacuum interrupter and an isolating switch;

[0006] The first bushing and the second bushing are respectively arranged on opposite sides of the box body; an insulating box is fixed in the box body; the disconnector and the vacuum interrupter are installed in different chambers of the insulating box; a first conductor electrically connected to the conductor inside the first bushing, a second conductor electrically connected to the conductor inside the second bushing, a third conductor located between the disconnector and the vacuum interrupter, and the vacuum interrupter are injection-molded and fixed in the insulating box;

[0007] The vacuum interrupter is vertically arranged, the static conductive rod at one end of the vacuum interrupter is fixedly connected to the third conductor, the outer end of the dynamic conductive rod at one end of the vacuum interrupter is connected to the first conductor through a soft connecting conductor, the isolating knife in the disconnector is rotatably installed on the third conductor, the contact knife seat that cooperates with the isolating knife in the disconnector is connected to the second conductor, and a first driving mechanism that drives the isolating knife to rotate and a second driving mechanism that drives the dynamic conductive rod to move up and down are provided in the box.

[0008] In the above technical solution, the first driving mechanism includes a first driving shaft rotatably arranged on the box body and a first linkage assembly connecting the first driving shaft and the isolation knife. When the first driving shaft is driven to rotate by external force, the isolation knife is driven to rotate through the first linkage assembly to contact or separate from the contact knife seat.

[0009] In the above technical solution, the first linkage assembly includes a first crank arm fixed on the first driving shaft and an insulating connecting plate with both ends movably connected to the first crank arm and a fixed plate through connecting shafts, and the fixed plate is fixed on the isolation knife;

[0010] A fixing sleeve hole and a first limiting slot are formed on the first crank arm, and the fixing sleeve hole is locked by a locking screw after being sleeved on the first driving shaft. One end of the insulating connecting plate is suitable for being inserted into the first limiting slot and connected through a connecting shaft. A second limiting slot is provided on the other end of the insulating connecting plate, and one end of the fixing plate is suitable for being inserted into the second limiting slot and connected through another connecting shaft.

[0011] In the above technical solution, the second driving mechanism includes a second driving shaft rotatably arranged on the box body and a second linkage assembly connecting the second driving shaft and the moving conductive rod. When the second driving shaft is driven to rotate by external force, the moving conductive rod is driven up and down by the second linkage assembly to contact or separate from the static conductive rod; the second linkage assembly includes a second crank arm fixed on the second driving shaft and an insulating pull rod whose two ends are respectively connected to the second crank arm and the moving conductive rod.

[0012] In the above technical solution, the insulating pull rod includes an insulating shell, a first pull rod insert injection-molded and fixed at one end of the insulating shell and connected to the moving conductive rod, a second pull rod insert injection-molded and fixed at the other end of the insulating shell, a movable link arranged in the second pull rod insert and movable up and down, a limit sleeve fixed at the end of the second pull rod insert for limiting the movable link in the second pull rod insert, and a compression spring arranged in the second pull rod insert to provide an outward elastic force for the movable link, the movable link movably passes through the limit sleeve, and has a resisting step on the movable link that contacts the inner end of the limit sleeve, and the outer end of the movable link is connected to the second crank arm through a connecting rod.

[0013] In the above technical solution, the limiting sleeve is fixed to the second pull rod insert by screwing.

[0014] In the above technical solution, a limit baffle is fixed at the contact knife seat in the insulating box, and the isolation knife contacts the limit baffle when it is matched with the contact knife seat.

[0015] In the above technical solution, the contact blade seat and the second conductor are integrally formed.

[0016] In the above technical solution, an isolation wall is formed in the insulation box between the vacuum interrupter and the disconnector.

[0017] In the above technical solution, an oil buffer is fixed in the box body, a buffer crank arm is fixed on the second driving shaft near the oil buffer, a roller is fixed on the buffer crank arm, and the roller presses against the piston rod on the oil buffer during the process of the second driving shaft driving the vacuum interrupter to open the circuit breaker.

[0018] In the above technical solution, the outer part of the insulating box is integrally formed with a first insulating socket and a second insulating socket that respectively cover the first conductor and the second conductor; the outer end of the first conductor extends out of the first insulating socket and is provided with a first contact that is plugged into and matched with the conductor inside the first sleeve; the inner end of the first sleeve extends into the box and has a first plug-in sleeve that is plugged into and matched with the first insulating socket; the outer end of the second conductor extends out of the second insulating socket and is provided with a second contact that is plugged into and matched with the conductor inside the second sleeve; the inner end of the second sleeve extends into the box and has a second plug-in sleeve that is plugged into and matched with the first insulating socket; and sealing rings are pressed between the first insulating socket and the first plug-in sleeve and between the first insulating socket and the second plug-in sleeve.

[0019] The present invention has positive effects: in the present invention, by fixing the insulating box in the box body and arranging the isolating switch and the vacuum interrupter in different chambers on the insulating box, the isolating switch and the vacuum interrupter are kept at a relatively large distance in space, thereby ensuring safety, and further, the first conductor, the second conductor, the third conductor and the vacuum interrupter are integrally injection-molded on the insulating box, thereby reducing subsequent assembly steps. When assembling an outdoor vacuum circuit breaker, the relevant components on the insulating box can be assembled externally first, and then the insulating box as a whole can be placed in the box body and fixed, thereby facilitating assembly production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of an outdoor vacuum circuit breaker in the present invention;

[0021] Figure 2 for Figure 1 A bottom view of the outdoor vacuum circuit breaker shown;

[0022] Figure 3 For the Figure 2 Sectional view taken along line AA;

[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 This is a structural diagram of the first linkage component in the present invention.

[0025] The reference numerals shown in the figure are: 1-box; 2-first bushing; 3-second bushing; 4-vacuum interrupter; 5-isolating switch; 6-insulating box; 7-first conductor; 8-second conductor; 9-third conductor; 10-isolating knife; 11-knife contact seat; 12-first driving shaft; 13-first turning arm; 130-fixing plate; 131-fixing sleeve hole; 132-first limiting slot; 133-locking screw; 14-insulating connecting plate; 141-second limiting slot; 15-second driving shaft; 16-second driving mechanism; 17-soft connecting guide Body; 18-insulating pull rod; 19-second turning arm; 20-insulating shell; 21-first pull rod insert; 22-second pull rod insert; 23-movable connecting rod; 231-resisting step; 24-compression spring; 25-limiting sleeve; 26-connecting rod; 27-limiting baffle; 28-partition wall; 29-oil buffer; 30-buffer turning arm; 31-roller; 32-piston rod; 33-first insulating socket; 34-second insulating socket; 35-first contact; 36-first plug sleeve; 37-second contact; 38-second plug sleeve; 39-third turning arm. DETAILED DESCRIPTION

[0026] The specific structure of the outdoor vacuum circuit breaker of the present invention is described below with reference to the accompanying drawings:

[0027] An outdoor vacuum circuit breaker with built-in isolating switch, such as Figures 1 to 4As shown, it includes a box body 1, a first bushing 2, a second bushing 3, a vacuum interrupter 4 and a disconnector 5; the first bushing 2 and the second bushing 3 are respectively arranged on opposite sides of the box body 1, an insulating box 6 is fixed in the box body 1, the disconnector 5 and the vacuum interrupter 4 are installed in different cavities on the insulating box 6, and a first conductor 7 electrically connected to the inner conductor of the first bushing 2, a second conductor 8 electrically connected to the inner conductor of the second bushing 3, a third conductor 9 between the disconnector 5 and the vacuum interrupter 4, and the vacuum interrupter 4 are injection-molded and fixed in the insulating box 6. Empty arc extinguishing chamber 4; the vacuum arc extinguishing chamber 4 is vertically arranged, the static conductive rod at one end of the vacuum arc extinguishing chamber 4 is fixedly connected to the third conductor 9, the outer end of the dynamic conductive rod at one end of the vacuum arc extinguishing chamber 4 is connected to the first conductor 7 through a soft connecting conductor 17, the isolating knife 10 in the isolating switch 5 is rotatably installed on the third conductor 9, the contact knife seat 11 in the isolating switch 5 that cooperates with the isolating knife 10 is connected to the second conductor 8, and a first driving mechanism for driving the isolating knife 10 to rotate and a second driving mechanism 16 for driving the dynamic conductive rod to move up and down are provided in the box body 1. In this embodiment, the insulating box 6 is fixed in the box body 1, and the isolating switch 5 and the vacuum interrupter 4 are arranged in different chambers on the insulating box 6, so that the isolating switch 5 and the vacuum interrupter 4 are kept at a relatively large distance in space to ensure safety. Furthermore, the first conductor 7, the second conductor 8, the third conductor 9 and the vacuum interrupter 4 are integrally injection-molded on the insulating box 6, thereby reducing subsequent assembly steps. When assembling the outdoor vacuum circuit breaker, the relevant components on the insulating box 6 can be assembled externally first, and then the insulating box 6 as a whole can be placed in the box body 1 and fixed, which is more convenient for assembly production.

[0028] In this embodiment, the first driving mechanism includes a first driving shaft 12 rotatably arranged on the housing 1 and a first linkage assembly connecting the first driving shaft 12 and the isolation knife 10. When the first driving shaft 12 is driven by an external force to rotate, the isolation knife 10 is driven to rotate through the first linkage assembly to contact or separate with the contact knife seat 11; when the isolation switch is opened or closed, the first driving shaft 12 is driven to rotate by the driving mechanism outside the housing 1, and when the first driving shaft 12 rotates, the isolation knife 10 is driven to open or close through the first linkage assembly. As a further improvement scheme, see Figure 5As shown, the first linkage assembly includes a first crank arm 13 fixed on the first drive shaft 12 and an insulating connecting plate 14 whose two ends are movably connected to the first crank arm 13 and a fixed plate 130 through a connecting shaft, and the fixed plate 130 is fixed to the isolation knife 10; the first crank arm 13 is formed with a fixing sleeve hole 131 and a first limiting slot 132, and the fixing sleeve hole 131 is locked by a locking screw 133 after being sleeved with the first drive shaft 12, thereby fixing the first crank arm 13 on the first drive shaft 12, and one end of the insulating connecting plate 14 is suitable for being inserted into the first limiting slot 132 and passing through a connecting shaft. The second limiting slot 141 is provided on the other end of the insulating connecting plate 14, and one end of the fixing plate 130 is suitable for being inserted into the second limiting slot 141 and connected through another connecting shaft. The first linkage assembly made of the above structure has good connection stability, and is adapted to be plugged in with one end of the insulating connecting plate 14 through the first limiting slot 132, and one end of the fixing plate 130 is adapted to be plugged in with the second limiting slot 141. In this way, the connection joint can be effectively limited in the axial direction of the connecting shaft, so that the force generated when the first driving shaft 12 rotates can be effectively transmitted to the isolation knife 10 through the first crank arm 13, the insulating connecting plate 14 and the fixing plate 130.

[0029] Furthermore, the second driving mechanism 16 includes a second driving shaft 15 rotatably arranged on the box body 1 and a second linkage assembly connecting the second driving shaft 15 and the moving conductive rod. When the second driving shaft 15 is driven by external force to rotate, the moving conductive rod is driven up and down by the second linkage assembly to contact or separate from the static conductive rod; the second linkage assembly includes a second crank arm 19 fixed on the second driving shaft 15 and an insulating pull rod 18 connecting the second crank arm 19 and the moving conductive rod at both ends. When the driving mechanism outside the box body 1 drives the second driving shaft 15 to rotate, it drives the second crank arm 19 to rotate, and then drives the moving conductive rod up and down through the insulating pull rod 18 to control the partial closing inside the vacuum interrupter 4.

[0030] As an implementation method of this embodiment, please refer to Figure 3 and Figure 4The insulating pull rod 18 includes an insulating shell 20, a first pull rod insert 21 injection-molded and fixed at one end of the insulating shell 20 and connected to the moving conductive rod, a second pull rod insert 22 injection-molded and fixed at the other end of the insulating shell 20, a movable link 23 movable up and down and arranged in the second pull rod insert 22, a limiting sleeve 25 fixed at the end of the second pull rod insert 22 for limiting the movable link 23 in the second pull rod insert 22, and a compression spring 24 arranged in the second pull rod insert 22 to provide an outward elastic force for the movable link 23, the movable link 23 movably passes through the limiting sleeve 25, and has a resisting step 231 on the movable link 23 that contacts the inner end of the limiting sleeve 25, and the outer end of the movable link 23 is connected to the second crank arm 19 through a connecting rod 26.

[0031] The insulating pull rod 18 has elasticity. When the vacuum interrupter is closed (i.e. when the dynamic and static conductive rods are in contact), the insulating pull rod 18 undergoes axial expansion and contraction to provide elastic buffering, thereby providing a certain degree of protection for the dynamic and static conductive rods.

[0032] In this embodiment, the limit sleeve 25 is fixed to the second pull rod insert 22 by screwing. In actual operation, the limit sleeve 25 can also be fixed to the second pull rod insert 22 by welding. The advantage of using the screw connection is that the preload force of the compression spring can be adjusted by adjusting the fitting depth between the limit sleeve 25 and the second pull rod insert 22 as needed during assembly.

[0033] In this embodiment, a limiting baffle 27 is fixed at the contact knife seat 11 in the insulating box 6, and the isolation knife 10 contacts the limiting baffle 27 when it is matched with the contact knife seat 11. When the isolation knife 10 is driven by the first driving mechanism to rotate to the closed position, that is, contacts the contact knife seat 11, the limiting baffle 27 contacts the isolation knife 10 to limit the staying position of the isolation knife 10, thereby ensuring the reliability of the contact between the isolation knife 10 and the contact knife seat 11.

[0034] In this embodiment, the blade contact seat 11 and the second conductor 8 are integrally formed, thereby reducing the number of parts and the number of assembly steps.

[0035] In this embodiment, an isolation wall 28 is formed in the insulating box 6 between the vacuum interrupter 4 and the disconnector 5 , and the isolation wall 28 strengthens the isolation to ensure safety.

[0036] Furthermore, an oil buffer 29 is fixed in the box body 1, and a buffer crank arm 30 is fixed on the second driving shaft 15 at a position close to the oil buffer 29, and a roller 31 is fixed on the buffer crank arm 30. When the second driving shaft 15 drives the vacuum interrupter 4 to open, the roller 31 presses against the piston rod 32 on the oil buffer 29. When the second driving shaft 15 is controlled to rotate to drive the vacuum interrupter to open, the roller 31 contacts the piston rod 32 on the oil buffer when the buffer crank arm 30 rotates, thereby playing a damping and buffering role, thereby avoiding malfunctions of related components due to strong collisions.

[0037] In this embodiment, the outer part of the insulating box 6 is integrally formed with a first insulating sleeve 33 and a second insulating sleeve 34 that respectively cover 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 with a first contact 35 that is plugged into the inner conductor of the first sleeve 2. The inner end of the first sleeve 2 extends into the box body 1 and has a first plug-in sleeve 36 that is plugged into the first insulating sleeve 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 that is plugged into the inner conductor of the second sleeve 3. The inner end of the second sleeve 3 extends into the box body 1 and has a There is a second plug-in sleeve 38 that is plugged into and matched with the first insulating socket 33, and a sealing ring is compressed between the first insulating socket 33 and the first plug-in sleeve 36 and between the first insulating socket 33 and the second plug-in sleeve 39; in this embodiment, the first contact 35 is plugged into the conductor in the first sleeve 2, and the second contact is plugged into the conductor in the second sleeve 3 to form a connection, which is fast and easy to assemble. On this basis, the first plug-in sleeve 36 is plugged into and matched with the first insulating socket 33, and the second plug-in sleeve 38 is matched with the second insulating socket 33, thereby achieving a good insulation protection effect; by compressing the sealing ring, the gap is sealed to block the possible creepage path, thereby improving safety.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all embodiments here. However, obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An outdoor vacuum circuit breaker with a built-in isolating switch, comprising a box (1), a first bushing (2), a second bushing (3), a vacuum interrupter (4) and an isolating switch (5); characterized in that: The first bushing (2) and the second bushing (3) are respectively arranged on opposite sides of the box body (1); an insulating box (6) is fixed in the box body (1); the disconnector (5) and the vacuum interrupter (4) are installed in different chambers on the insulating box (6); a first conductor (7) electrically connected to the inner conductor of the first bushing (2), a second conductor (8) electrically connected to the inner conductor of the second bushing (3), a third conductor (9) between the disconnector (5) and the vacuum interrupter (4), and the vacuum interrupter (4) are injection-molded and fixed in the insulating box (6); The vacuum interrupter (4) is vertically arranged, a static conductive rod at one end of the vacuum interrupter (4) is fixedly connected to the third conductor (9), an outer end of a dynamic conductive rod at one end of the vacuum interrupter (4) is connected to the first conductor (7) via a soft connecting conductor (17), an isolating knife (10) in the isolating switch (5) is rotatably mounted on the third conductor (9), a contact knife seat (11) in the isolating switch (5) that cooperates with the isolating knife (10) is connected to the second conductor (8), and a first driving mechanism for driving the isolating knife (10) to rotate and a second driving mechanism (16) for driving the dynamic conductive rod to move up and down are provided in the box (1); the contact knife seat (11) and the second conductor (8) are integrally formed; The second driving mechanism (16) includes a second driving shaft (15) rotatably arranged on the box body (1) and a second linkage assembly connecting the second driving shaft (15) and the moving conductive rod, and when the second driving shaft (15) is driven to rotate by an external force, the moving conductive rod is driven to move up and down through the second linkage assembly to contact or separate from the static conductive rod; the second linkage assembly includes a second crank arm (19) fixed on the second driving shaft (15) and an insulating pull rod (18) with two ends respectively connecting the second crank arm (19) and the moving conductive rod; The insulating pull rod (18) includes an insulating shell (20), a first pull rod insert (21) injection-molded and fixed to one end of the insulating shell (20) and connected to the movable conductive rod, a second pull rod insert (22) injection-molded and fixed to the other end of the insulating shell (20), a movable link (23) movable up and down in the second pull rod insert (22), a limiting sleeve (25) fixed at the end of the second pull rod insert (22) for limiting the movable link (23) in the second pull rod insert (22), and a compression spring (24) provided in the second pull rod insert (22) for providing an outward elastic force for the movable link (23), the movable link (23) movably passes through the limiting sleeve (25), and has a resisting step (231) on the movable link (23) that contacts the inner end of the limiting sleeve (25), and the outer end of the movable link (23) is connected to the second crank arm (19) through a connecting rod (26).

2. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: The first driving mechanism comprises a first driving shaft (12) rotatably arranged on the housing (1) and a first linkage assembly connecting the first driving shaft (12) and the isolation knife (10). When the first driving shaft (12) is driven to rotate by an external force, the isolation knife (10) is driven to rotate through the first linkage assembly to contact or separate from the contact knife seat (11).

3. The isolating switch built-in outdoor vacuum circuit breaker according to claim 2, characterized in that: The first linkage assembly comprises a first crank arm (13) fixed on the first driving shaft (12) and an insulating connecting plate (14) having two ends movably connected to the first crank arm (13) and a fixed plate (130) via connecting shafts, wherein the fixed plate (130) is fixed on the isolation knife (10); A fixing sleeve hole (131) and a first limiting slot (132) are formed on the first crank arm (13); the fixing sleeve hole (131) is sleeved with the first driving shaft (12) and locked by a locking screw (133); one end of the insulating connecting plate (14) is suitable for being inserted into the first limiting slot (132) and connected through a connecting shaft; a second limiting slot (141) is provided on the other end of the insulating connecting plate (14); one end of the fixing plate (130) is suitable for being inserted into the second limiting slot (141) and connected through another connecting shaft.

4. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: The limiting sleeve (25) is fixed to the second pull rod insert (22) by screw connection.

5. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: A limit baffle (27) is fixed at the contact knife seat (11) in the insulating box (6), and the isolation knife (10) contacts the limit baffle (27) when it is mated with the contact knife seat (11).

6. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: An isolation wall (28) is formed in the insulating box (6) between the vacuum interrupter (4) and the disconnector (5).

7. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: An oil buffer (29) is fixed in the box body (1), a buffer crank arm (30) is fixed on the second driving shaft (15) at a position close to the oil buffer (29), a roller (31) is fixed on the buffer crank arm (30), and the roller (31) presses against the piston rod (32) on the oil buffer (29) during the process of the second driving shaft (15) driving the vacuum interrupter (4) to open.

8. The isolating switch built-in outdoor vacuum circuit breaker according to claim 1, characterized in that: The insulating box (6) is provided with a first insulating socket (33) and a second insulating socket (34) which respectively cover the first conductor (7) and the second conductor (8). The outer end of the first conductor (7) extends out of the first insulating socket (33) and is provided with a first contact (35) which is plugged into and matched with the inner conductor of the first sleeve (2). The inner end of the first sleeve (2) extends into the box (1) and is provided with a first plug (36) which is plugged into and matched with the first insulating socket (33). The outer end of the second conductor (8) extends out of the second insulating socket (34) and is provided with a second contact (37) which is plugged into and matched with the inner conductor of the second sleeve (3). The inner end of the second sleeve (3) extends into the box (1) and is provided with a second plug (38) which is plugged into and matched with the first insulating socket (33). A sealing ring is compressed between the first insulating socket (33) and the first plug (36) and between the second insulating socket (34) and the second plug (38).

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