A solid insulation switch cabinet parallel three-position circuit breaker opening and closing device

Abstract

This invention discloses a three-position circuit breaker opening and closing device for a solid-insulated switchgear, within the field of circuit breaker technology. It includes a feeder bushing, which is connected to the circuit breaker pole via a feeder sealing connection structure and a lower sealing connection structure of the circuit breaker. The circuit breaker pole is connected to the three-position switch pole via an upper sealing connection structure of the circuit breaker and a lower sealing connection structure of the three-position switch. The three-position switch pole is connected to the busbar bushing via an upper sealing connection structure of the three-position switch and a lower sealing connection structure of the busbar. The feeder bushing collects multiple voltages and connects them to the circuit breaker pole. The circuit breaker pole enables the switching between the voltage after the feeder and the three-position switch pole. The three-position pole enables the switching of isolation opening, closing, and grounding opening and closing. Finally, the voltage is connected to the busbar cable or copper busbar through the busbar bushing. This device achieves segmented installation while retaining the opening and closing functions, and offers better conductivity, sealing, and safety.

Description

Technical Field

[0001] This invention relates to a switching device for a three-position parallel circuit breaker in a solid-insulated switchgear, within the field of circuit breaker technology. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. In the prior art, segmented assembly structures are designed for easy installation and disassembly, and circuit breakers are connected using this structure. However, this segmented structure itself does not have opening and closing functions, cannot be used independently, and its joints lack sufficient conductivity and sealing. Summary of the Invention

[0003] The purpose of this invention is to provide a three-position circuit breaker opening and closing device for a solid-insulated switchgear, which can achieve segmented installation, inherit the opening and closing functions, and has better conductivity, sealing performance, and safety.

[0004] To achieve the above objectives, the present invention provides a three-position circuit breaker opening and closing device for a solid-insulated switchgear, comprising a feeder bushing, wherein the feeder bushing is connected to the circuit breaker pole via a feeder sealing connection structure and a lower sealing connection structure of the circuit breaker, the circuit breaker pole is connected to the three-position switch pole via an upper sealing connection structure of the circuit breaker and a lower sealing connection structure of the three-position switch, and the three-position switch pole is connected to the busbar bushing via an upper sealing connection structure of the three-position switch and a lower sealing connection structure of the busbar.

[0005] Compared with the prior art, the beneficial effects of the present invention are that the feeder bushing, circuit breaker pole, three-position switch pole, and bus bushing are spliced ​​together through corresponding sealed connection structures. The feeder bushing gathers multiple voltages and connects them to the circuit breaker pole. The circuit breaker pole realizes the switching between the voltage after the feeder and the three-position switch pole. The three-position pole realizes the switching of isolation opening, closing, and grounding opening and closing. Finally, the voltage is connected to the bus cable or copper busbar through the bus bushing. It can realize segmented installation and inherit the opening and closing functions, and has better conductivity and sealing and is safer.

[0006] As a further improvement of the present invention, the feeder bushing includes a feeder insulating shell, in which multiple feeder interfaces are arranged side by side. The lower end of the feeder interface is connected to the bottom of the feeder insulating shell, and the upper end of the feeder interface is connected to the lower end of the feeder copper column. The lower part of the feeder copper column is hollow and connected to the upper end of the feeder interface. The upper end of the feeder copper column is connected to the feeder copper core. The feeder copper core is located on the upper part of the feeder insulating shell. An external connecting pipe is provided on one side of the feeder insulating shell. An auxiliary copper column is provided inside the external connecting pipe. An auxiliary insertion port is opened on the outer side of the auxiliary copper column. The inner side of the auxiliary copper column is connected to one end of the feeder copper core. The top of one side of the feeder insulating shell is connected to a feeder sealing connection structure. A feeder connecting copper rod is provided inside the feeder sealing connection structure. The lower end of the feeder connecting copper rod is connected to one end of the feeder copper core.

[0007] Cables requiring parallel connection can be sequentially inserted into a feeder interface. The exposed conductors at the cable ends after stripping are further inserted into the hollow part of the feeder copper post, thus electrically connecting with the feeder copper post. Since the feeder copper post is connected to the feeder copper core, and the feeder copper core is connected to the auxiliary copper post and the feeder connecting copper rod, the cable is electrically connected to the auxiliary copper post and the feeder connecting copper rod. In this way, the voltage on the cable is paralleled at the feeder copper core, and the paralleled voltage is conducted to the circuit breaker pole through the feeder connecting copper rod. The auxiliary line socket on the outer end of the auxiliary copper post can be connected to the cable of a voltage transformer or surge arrester, serving the purpose of voltage measurement or safety protection.

[0008] As a further improvement of the present invention, the circuit breaker pole includes a circuit breaker insulating shell, a vacuum bulb is disposed inside the circuit breaker insulating shell, one end of the vacuum bulb is connected to the upper end of the lower connecting copper rod of the circuit breaker, and the other end of the vacuum bulb is connected to the lower end of the upper connecting copper rod of the circuit breaker. An insulating channel for inserting an insulating rod is provided inside the circuit breaker insulating shell, one end of the insulating channel is connected to the other end of the vacuum bulb, and the other end of the insulating channel passes through the other side of the feeder insulating shell. The top middle part of the circuit breaker insulating shell is connected to the upper sealing connection structure of the circuit breaker. The upper connecting copper rod of the circuit breaker is disposed inside the upper sealing connection structure of the circuit breaker, and the lower connecting copper rod of the circuit breaker is disposed inside the lower sealing connection structure of the circuit breaker. The lower sealing connection structure of the circuit breaker is disposed at the bottom of one side of the circuit breaker insulating shell.

[0009] In this way, the copper rod connecting the bottom of the circuit breaker is connected to the copper rod connecting the feeder, thereby conducting the parallel voltage to one end of the vacuum bulb. The insulating pull rod is inserted into the insulating channel and connected to the other end of the vacuum bulb. By pulling the insulating pull rod outward, the vacuum bulb is pulled, thus tripping the circuit breaker and disconnecting the parallel voltage from the copper rod connecting the top of the circuit breaker. Conversely, opening the connection makes the two connected, allowing the parallel voltage to be conducted from the copper rod connecting the bottom of the circuit breaker and the vacuum bulb to the copper rod connecting the top of the circuit breaker, and then to the three-position pole.

[0010] As a further improvement of the present invention, the three-position switch pole includes a three-position insulating shell, and a three-position vacuum interrupter is disposed inside the three-position insulating shell. One end of the three-position vacuum interrupter is connected to the lower end of the three-position upper connecting copper rod. The three-position upper connecting copper rod is disposed within the three-position upper sealing connection structure. The three-position upper sealing connection structure is disposed at the top of one side end of the three-position insulating shell. The other end of the three-position vacuum interrupter is connected to the opening at the other side end of the three-position insulating shell. The middle part of the three-position vacuum interrupter is connected to the upper end of the three-position lower connecting copper rod. The three-position lower connecting copper rod is disposed within the three-position lower sealing connection structure. The three-position lower sealing connection structure is disposed at the bottom middle position of the three-position insulating shell, and the other end is connected to the lower end of the grounding copper rod. The upper end of the grounding copper rod extends out of the top of the three-position insulating shell.

[0011] In this way, the connecting copper rod of the three-position lower circuit breaker is connected to the connecting copper rod of the circuit breaker, so that the voltage after paralleling can be conducted to the vacuum interrupter of the three-position circuit breaker. The insulating wire rod is inserted into the opening at the other end of the insulating shell of the three-position circuit breaker and connected to the vacuum interrupter of the three-position circuit breaker. The rotating insulating wire rod slowly drives the conductor in the middle of the vacuum interrupter of the three-position circuit breaker to switch between isolation, opening and closing and grounding. Only when the circuit breaker is closed can the parallel voltage be conducted to the connecting copper rod of the three-position circuit breaker.

[0012] As a further improvement of the present invention, the busbar bushing includes a busbar insulating shell, one end of which is connected to a busbar lower sealing connection structure, and the other end of which is vertically upwardly provided with a busbar upper connecting pipe. A busbar copper rod is provided inside the busbar insulating shell, the busbar lower sealing structure, and the busbar upper connecting pipe. The upper end of the busbar copper rod passes through the busbar upper connecting pipe and has an installation hole.

[0013] In this way, the lower end of the busbar copper rod is connected to the connecting copper rod on the three-position, so as to conduct the parallel voltage to the busbar bushing. The upper end of the busbar copper rod has a mounting hole, which is connected to the busbar cable bolt through the mounting hole, so as to conduct the parallel voltage to the busbar cable.

[0014] As a further improvement of the present invention, the feeder sealing connection structure includes a feeder upper connecting pipe, the lower end of which is connected to the top of one side of the feeder insulation shell, a feeder flange is provided in the middle of the feeder upper connecting pipe, the upper part of the feeder upper connecting pipe is machined into a frustum shape, a feeder connecting copper rod is disposed in the feeder upper connecting pipe, and a feeder upper insertion port is opened on the upper part of the feeder connecting copper rod; the circuit breaker lower sealing connection structure includes a circuit breaker lower connecting pipe, the lower end of which is connected to the bottom of one side of the circuit breaker insulation shell, a frustum-shaped circuit breaker lower slot matching the upper part of the feeder upper connecting pipe is opened in the circuit breaker lower connecting pipe, a circuit breaker lower connecting copper rod is disposed in the circuit breaker lower connecting pipe, a watch strap contact finger is provided on the lower outer periphery of the circuit breaker lower connecting copper rod, the upper part of the feeder upper connecting pipe is inserted into the circuit breaker lower slot, and the lower part of the circuit breaker lower connecting copper rod is inserted into the feeder upper insertion port on the upper part of the feeder connecting copper rod, and the feeder flange is bolted to the bottom of the circuit breaker lower connecting pipe.

[0015] This method involves inserting the upper part of the feeder connecting pipe into the lower slot of the circuit breaker, and simultaneously inserting the lower part of the circuit breaker's lower connecting copper rod into the feeder insertion port on the upper part of the feeder connecting copper rod. Then, the feeder flange is fixedly connected to the bottom of the circuit breaker's lower connecting pipe using bolts. This allows the feeder bushing and the circuit breaker pole to be spliced ​​together, making the splicing simple and convenient. The interlocking of the frustum-shaped structures, combined with the interlocking of the copper rods, forms a double-interlocking connection, making the connection more robust. Additionally, the copper rods are equipped with dial indicators, which allow the feeder connecting copper rod and the circuit breaker's lower connecting copper rod to slide and connect, ensuring more effective connection between conductors, guaranteeing good conductivity, and reducing temperature rise.

[0016] As a further improvement of the present invention, the upper sealing connection structure of the circuit breaker includes an upper connecting pipe of the circuit breaker, the lower end of which is connected to the middle top of the circuit breaker insulating shell, an inverted frustum-shaped upper slot of the circuit breaker is formed inside the upper connecting pipe, an upper connecting copper rod of the circuit breaker is disposed inside the upper connecting pipe, and a watch strap contact finger is provided on the upper outer periphery of the upper connecting copper rod of the circuit breaker; the three-position sealing connection structure includes a lower connecting pipe of the three positions, the upper end of which is connected to the middle bottom of the three-position insulating shell, and the three... A three-position flange is installed in the middle of the lower connecting pipe. The lower part of the lower connecting pipe is machined into an inverted frustum shape to match the slot on the circuit breaker. The lower connecting copper rod is installed in the lower connecting pipe. The lower part of the lower connecting copper rod has a lower insertion port. The lower part of the lower connecting pipe is inserted into the slot on the circuit breaker, and the upper part of the connecting copper rod on the circuit breaker is inserted into the lower insertion port at the bottom of the lower connecting copper rod. The three-position flange is bolted to the top of the upper connecting pipe on the circuit breaker.

[0017] The lower part of the three-position lower connecting pipe is inserted into the slot on the circuit breaker, and the upper part of the connecting copper rod on the circuit breaker is inserted into the lower socket of the three-position lower connecting copper rod. The three-position flange is bolted to the top of the connecting pipe on the circuit breaker. This allows the circuit breaker pole and the three-position pole to be spliced ​​together. The splicing is simple and convenient. The interlocking of the frustum-shaped structure with the interlocking of the copper rods forms a double interlocking connection, which is more secure. At the same time, the copper rod is equipped with a watchband contact finger, which allows the three-position lower connecting copper rod and the circuit breaker upper connecting copper rod to slide and connect, ensuring more effective connection between conductors, good conductivity, and reduced temperature rise.

[0018] As a further improvement of the present invention, the three-station upper sealing connection structure includes a three-station upper connecting pipe, the lower end of which is connected to the top of one side of the three-station insulating shell. An inverted frustum-shaped three-station upper slot is formed inside the three-station upper connecting pipe. A three-station upper connecting copper rod is disposed inside the three-station upper connecting pipe. A watch strap contact finger is provided on the upper outer periphery of the three-station upper connecting copper rod. The busbar sealing connection structure includes a busbar lower connecting pipe, the upper end of which is connected to the bottom of one end of the busbar insulating shell. A busbar flange is provided in the middle of the busbar lower connecting pipe. The lower part of the busbar lower connecting pipe is machined into an inverted frustum-shaped shape to match the three-station upper slot. The lower part of the busbar copper rod is disposed in the busbar lower connecting pipe. A busbar lower insertion port is formed on the lower part of the busbar copper rod. The lower part of the busbar lower connecting pipe is inserted into the three-station upper slot, and the upper part of the three-station upper connecting copper rod is inserted into the busbar lower insertion port on the lower part of the busbar copper rod. The busbar flange is bolted to the top of the three-station upper connecting pipe.

[0019] In this way, the lower part of the busbar connecting pipe is inserted into the slot on the three-position busbar, while the upper part of the connecting copper rod on the three-position busbar is inserted into the busbar insertion port at the lower part of the copper rod on the busbar. The busbar flange is bolted to the top of the connecting pipe on the three-position busbar. This allows the three-position pole and the busbar sleeve to be spliced ​​together. The splicing is simple and convenient. The frustum-shaped structure interlocks with the copper rods to form a double insertion, making the connection more secure. At the same time, the copper rods are equipped with watch strap contacts, which allow the connecting copper rods on the three-position busbar and the connecting copper rods on the busbar to slide and connect, ensuring more effective connection between conductors, good conductivity, and reduced temperature rise.

[0020] As a further improvement of the present invention, a polyester sealing sleeve is provided on the upper outer periphery of the feeder connecting pipe, the lower outer periphery of the three-position lower connecting pipe, and the lower outer periphery of the busbar connecting pipe.

[0021] When the connecting pipe on the feeder is inserted into the lower slot of the circuit breaker, the polyester sealing sleeve will be squeezed, completely filling the gap between the connecting pipe on the feeder and the lower slot of the circuit breaker, thus ensuring the sealing between the two. Similarly, the gap between the lower connecting pipe of the three-position circuit breaker and the upper slot of the circuit breaker, as well as the gap between the lower connecting pipe of the busbar and the upper slot of the three-position circuit breaker, will also be filled by the squeezing of the polyester sealing sleeve after they are inserted into each other, ensuring the sealing performance.

[0022] As a further improvement of the present invention, the feeder bushing, the circuit breaker pole, and the three-position switch pole are all located on the same vertical plane.

[0023] The feeder bushing, circuit breaker pole, and three-position switch pole occupy very little horizontal space after being spliced ​​together, effectively saving space inside the cabinet. The busbar bushing can be installed at different angles relative to the three-position pole according to the different phase sequences, so as to facilitate the differentiation of different phase sequences. Attached Figure Description

[0024] Figure 1 This is a perspective view of the present invention.

[0025] Figure 2 This is an exploded view of the present invention.

[0026] Figure 3 This is a cross-sectional view of the present invention.

[0027] Among them, 1 is the busbar bushing, 11 is the upper connection pipe of the busbar, 12 is the busbar insulation shell, 13 is the busbar flange, 14 is the lower connection pipe of the busbar, 15 is the mounting hole, and 16 is the busbar copper rod. 2. Three-position pole post; 21. Three-position upper connecting pipe; 22. Three-position flange; 23. Three-position lower connecting pipe; 24. Three-position insulating shell; 25. Three-position upper connecting copper rod; 26. Three-position lower connecting copper rod; 27. Three-position vacuum interrupter; 28. Grounding copper rod. 3 Circuit breaker pole, 31 Circuit breaker lower connecting pipe, 32 Circuit breaker upper connecting pipe, 33 Circuit breaker insulating shell, 34 Circuit breaker lower connecting copper rod, 35 Vacuum bulb, 36 Circuit breaker upper connecting copper rod, 37 Insulation channel. 4. Feeder sleeve, 41. Feeder upper connecting pipe, 42. Feeder flange, 43. External connecting pipe, 44. Feeder insulation shell, 45. Feeder connecting copper rod, 46. Auxiliary line socket, 47. Auxiliary line copper post, 48. Feeder copper core, 49. Feeder copper post, 410. Feeder interface. 5. Watch strap finger contacts. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings: like Figure 1-3The solid-insulated switchgear parallel three-position circuit breaker opening and closing device shown includes a feeder bushing 4. The feeder bushing 4 is connected to the circuit breaker pole 3 through the cooperation of the feeder sealing connection structure and the lower sealing connection structure of the circuit breaker. The circuit breaker pole 3 is connected to the three-position switch pole through the cooperation of the upper sealing connection structure of the circuit breaker and the lower sealing connection structure of the three-position switch. The three-position switch pole is connected to the busbar bushing 1 through the cooperation of the upper sealing connection structure of the three-position switch and the lower sealing connection structure of the busbar.

[0029] The feeder bushing 4 includes a feeder insulation shell 44, inside which multiple feeder interfaces 410 are arranged side by side. The lower end of each feeder interface 410 is connected to the bottom of the feeder insulation shell 44, and the upper end of each feeder interface 410 is connected to the lower end of a feeder copper post 49. The lower part of the feeder copper post 49 is hollow and connected to the upper end of the feeder interface 410. The upper end of the feeder copper post 49 is connected to a feeder copper core 48, which is located on the upper part of the feeder insulation shell 44. An external connecting pipe 43 is provided on one side of the feeder insulation shell 44. An auxiliary copper post 47 is provided inside the external connecting pipe 43. An auxiliary wire socket 46 is provided on the outer side of the auxiliary copper post 47. The inner side of the auxiliary copper post 47 is connected to one end of the feeder copper core 48. The top of one side of the feeder insulation shell 44 is connected to the feeder sealing connection structure. A feeder connecting copper rod 45 is provided inside the feeder sealing connection structure. The lower end of the feeder connecting copper rod 45 is connected to one end of the feeder copper core 48.

[0030] The circuit breaker pole 3 includes a circuit breaker insulating shell 33, inside which a vacuum bulb 35 is installed. One end of the vacuum bulb 35 is connected to the upper end of the lower connecting copper rod 34 of the circuit breaker, and the other end of the vacuum bulb 35 is connected to the lower end of the upper connecting copper rod 36 of the circuit breaker. An insulating channel 37 for inserting an insulating pull rod is opened inside the circuit breaker insulating shell 33. One end of the insulating channel 37 is connected to the other end of the vacuum bulb 35, and the other end of the insulating channel 37 passes through the other side of the feeder insulating shell 44. The top middle part of the circuit breaker insulating shell 33 is connected to the upper sealing connection structure of the circuit breaker. The upper connecting copper rod 36 of the circuit breaker is set inside the upper sealing connection structure of the circuit breaker, and the lower connecting copper rod 34 of the circuit breaker is set inside the lower sealing connection structure of the circuit breaker. The lower sealing connection structure of the circuit breaker is set at the bottom of one side of the circuit breaker insulating shell 33.

[0031] The three-position switch pole includes a three-position insulating shell 24, inside which is a three-position vacuum interrupter 27. One end of the three-position vacuum interrupter 27 is connected to the lower end of the three-position upper connecting copper rod 25, which is located within a three-position upper sealing connection structure. The three-position upper sealing connection structure is located at the top of one side of the three-position insulating shell 24. The other end of the three-position vacuum interrupter 27 is connected to an opening on the other side of the three-position insulating shell 24. The middle part of the three-position vacuum interrupter 27 is connected to the upper end of the three-position lower connecting copper rod 26, which is located within a three-position lower sealing connection structure. The three-position lower sealing connection structure is located at the bottom middle position of the three-position insulating shell 24. The other end of the lower connecting copper rod 26 is connected to the lower end of a grounding copper rod 28, the upper end of which extends beyond the top of the three-position insulating shell 24.

[0032] The busbar bushing 1 includes a busbar insulation shell 12. One end of the busbar insulation shell 12 is connected to the bottom of the busbar lower sealing connection structure. The other end of the busbar insulation shell 12 is provided with a busbar upper connecting pipe 11 vertically upward. A busbar copper rod 16 is provided inside the busbar insulation shell 12, the busbar lower sealing structure and the busbar upper connecting pipe 11. The upper end of the busbar copper rod 16 passes through the busbar upper connecting pipe 11 and has an installation hole 15.

[0033] The feeder sealing connection structure includes a feeder upper connecting pipe 41, the lower end of which is connected to the top of one side of the feeder insulation shell 44. A feeder flange 42 is provided in the middle of the feeder upper connecting pipe 41, and the upper part of the feeder upper connecting pipe 41 is machined into a frustoconical shape. A feeder connecting copper rod 45 is disposed in the feeder upper connecting pipe 41, and a feeder upper insertion port is opened on the upper part of the feeder connecting copper rod 45. The circuit breaker lower sealing connection structure includes a circuit breaker lower connecting pipe 31, the lower end of which is connected to the bottom of one side of the circuit breaker insulation shell 33. The circuit breaker lower connecting pipe 31 has a frustoconical circuit breaker lower slot that matches the upper part of the feeder connecting pipe 41. The circuit breaker lower connecting copper rod 34 is set inside the circuit breaker lower connecting pipe 31. The lower outer periphery of the circuit breaker lower connecting copper rod 34 is provided with a watch strap contact finger 5. The upper part of the feeder connecting pipe 41 is inserted into the circuit breaker lower slot, and the lower part of the circuit breaker lower connecting copper rod 34 is inserted into the feeder insertion port at the upper part of the feeder connecting copper rod 45. The feeder flange 42 is bolted to the bottom of the circuit breaker lower connecting pipe 31.

[0034] The circuit breaker upper sealing connection structure includes an upper circuit breaker connecting pipe 32, the lower end of which is connected to the middle top of the circuit breaker insulating shell 33. An inverted frustum-shaped upper circuit breaker slot is formed inside the upper circuit breaker connecting pipe 32. An upper circuit breaker connecting copper rod 36 is disposed inside the upper circuit breaker connecting pipe 32, and a watch strap contact finger 5 is provided on the upper outer periphery of the upper part of the upper circuit breaker connecting copper rod 36. The three-position sealing connection structure includes a three-position lower connecting pipe 23, the upper end of which is connected to the middle bottom of the three-position insulating shell 24. A three-position flange 22 is provided in the middle of 23. The lower part of the three-position lower connecting pipe 23 is machined into an inverted frustum shape to match the slot on the circuit breaker. The three-position lower connecting copper rod 26 is set in the three-position lower connecting pipe 23. The lower part of the three-position lower connecting copper rod 26 has a three-position lower insertion port. The lower part of the three-position lower connecting pipe 23 is inserted into the slot on the circuit breaker, and the upper part of the circuit breaker upper connecting copper rod 36 is inserted into the three-position lower insertion port at the lower part of the three-position lower connecting copper rod 26. The three-position flange 22 is bolted to the top of the circuit breaker upper connecting pipe 32.

[0035] The three-position sealing connection structure includes a three-position upper connecting pipe 21, the lower end of which is connected to the top of one side of the three-position insulating shell 24. An inverted frustum-shaped three-position upper slot is formed inside the three-position upper connecting pipe 21. A three-position upper connecting copper rod 25 is disposed inside the three-position upper connecting pipe 21, and a watch strap contact finger 5 is provided on the upper outer periphery of the three-position upper connecting copper rod 25. The busbar sealing connection structure includes a busbar lower connecting pipe 14, the upper end of which is connected to the bottom of one end of the busbar insulating shell 12. A busbar flange 13 is provided in the middle of the lower connecting pipe 14. The lower part of the lower connecting pipe 14 is machined into an inverted frustum shape to match the slot on the three-station. The lower part of the busbar copper rod 16 is placed in the lower connecting pipe 14. The lower part of the busbar copper rod 16 has a busbar insertion port. The lower part of the lower connecting pipe 14 is inserted into the slot on the three-station, and the upper part of the connecting copper rod 25 on the three-station is inserted into the busbar insertion port at the lower part of the busbar copper rod 16. The busbar flange 13 is bolted to the top of the connecting pipe 21 on the three-station.

[0036] Polyester sealing sleeves are provided on the upper outer periphery of the feeder connecting pipe 41, the lower outer periphery of the three-position lower connecting pipe 23, and the lower outer periphery of the busbar connecting pipe 14. The feeder bushing 4, the circuit breaker pole 3, and the three-position switch pole are all on the same vertical plane.

[0037] In this invention, all outermost layers are made of insulating material.

[0038] The feeder sleeve 4 has four rows of feeder interfaces 410, allowing up to four feeder cables to be inserted simultaneously. The inner diameter of the feeder interface 410 matches the outer diameter of the feeder cable. After stripping the wires from the end of the feeder cable, the conductor is exposed. After the feeder cable is inserted into the feeder interface 410, the exposed conductor is further inserted into the hollow part of the feeder copper post 49 until the top of the conductor contacts the top of the hollow part of the feeder copper post 49. The inner diameter of the hollow part of the feeder copper post 49 matches the outer diameter of the conductor. In this way, the conductor of the feeder cable and the feeder copper post 410 are connected. 9. A good electrical connection is formed. Since the feeder copper post 49 is connected to the feeder copper core 48, and the feeder copper core 48 is connected to the auxiliary copper post and the feeder connecting copper rod 45, the conductor of the feeder cable is electrically connected to the auxiliary copper post and the feeder connecting copper rod 45. In this way, the voltage on the feeder cable is paralleled at the feeder copper core 48, and the paralleled voltage is transmitted through the feeder connecting copper rod 45. The auxiliary line socket 46 at the outer end of the auxiliary copper post 47 can be connected to the cable of the voltage transformer or the surge arrester to play the role of voltage measurement or safety protection.

[0039] When the feeder bushing 4 and the circuit breaker pole 3 are assembled together, the upper part of the feeder connecting pipe 41 is inserted into the lower slot of the circuit breaker, and the lower part of the lower connecting copper rod 34 of the circuit breaker is simultaneously inserted into the feeder insertion port at the upper part of the feeder connecting copper rod 45. Then, the feeder flange 42 is fixedly connected to the bottom of the lower connecting pipe 31 of the circuit breaker using bolts. This allows the feeder bushing 4 and the circuit breaker pole 3 to be spliced ​​together, which is simple and convenient. The interlocking of the frustum-shaped structures, combined with the interlocking of the copper rods, forms a double interlocking connection, making the connection more secure. Simultaneously, the copper rods are equipped with watch strap contacts 5, which allow the feeder connecting copper rod 45 and the lower connecting copper rod 34 of the circuit breaker to slide and connect, ensuring more effective connection between conductors, good conductivity, and reduced temperature rise. When the feeder connecting pipe 41 is inserted into the lower slot of the circuit breaker, the polyester sealing sleeve is compressed, completely filling the gap between the feeder connecting pipe 41 and the lower slot of the circuit breaker, thus ensuring the seal between them.

[0040] After the feeder bushing 4 and the circuit breaker pole 3 are assembled, the lower connecting copper rod 34 of the circuit breaker is connected to the feeder connecting copper rod 45. This allows the voltage after paralleling to be conducted from the feeder connecting copper rod 45 and the lower connecting copper rod 34 of the circuit breaker to one end of the vacuum bulb 35. Meanwhile, the insulating pull rod is inserted into the insulating channel 37 and connected to the other end of the vacuum bulb 35. Pulling the vacuum bulb 35 outward with the insulating pull rod will open the circuit breaker, thus disconnecting the voltage after paralleling from the upper connecting copper rod 36 of the circuit breaker. Conversely, opening the circuit breaker will connect the two, allowing the voltage after paralleling to be conducted from the lower connecting copper rod 34 and the vacuum bulb 35 to the upper connecting copper rod 36 of the circuit breaker.

[0041] When the circuit breaker pole 3 and the three-position pole 2 are assembled, the lower part of the three-position lower connecting pipe 23 is inserted into the slot on the circuit breaker, and the upper part of the circuit breaker upper connecting copper rod 36 is inserted into the three-position lower insertion port at the lower part of the three-position lower connecting copper rod 26. The three-position flange 22 is bolted to the top of the circuit breaker upper connecting pipe 32. In this way, the circuit breaker pole 3 and the three-position pole 2 can be spliced ​​together. The splicing is simple and convenient. The interlocking of the frustum-shaped structure with the interlocking of the copper rods forms a double interlocking, which makes the connection more secure. At the same time, the copper rod is equipped with a watch strap contact finger 5. Through the watch strap contact finger 5, the three-position lower connecting copper rod 26 and the circuit breaker upper connecting copper rod 36 can be slidably connected to ensure more effective connection between conductors, ensure good conductivity and reduce temperature rise. When the lower connecting pipe 23 of the third position is inserted into the slot on the circuit breaker, the polyester sealing sleeve will be squeezed to completely fill the gap between the lower connecting pipe 23 of the third position and the slot on the circuit breaker, thereby ensuring the sealing between the two.

[0042] After the circuit breaker pole 3 and the three-position pole 2 are assembled, the lower connecting copper rod 26 of the three-position pole and the upper connecting copper rod 36 of the circuit breaker are connected, so that the voltage after paralleling can be conducted to the three-position vacuum interrupter 27. The insulating thread is inserted into the opening on the other side of the insulating shell 24 of the three-position pole and connected to the three-position vacuum interrupter 27. The rotating insulating thread slowly drives the conductor in the middle of the three-position vacuum interrupter 27 to switch between isolation, opening and closing and grounding. Only when the circuit is closed can the parallel voltage be conducted to the upper connecting copper rod 25 of the three-position pole.

[0043] When assembling the three-position pole 2 with the busbar bushing 1, the lower part of the busbar lower connecting pipe 14 is inserted into the slot on the three-position pole, while the upper part of the connecting copper rod 25 on the three-position pole is inserted into the busbar lower insertion port at the lower part of the busbar copper rod 16. The busbar flange 13 is bolted to the top of the connecting pipe 21 on the three-position pole. This allows the three-position pole 2 and the busbar bushing 1 to be spliced ​​together. The splicing is simple and convenient, and the interlocking of the frustum-shaped structure with the insertion of the copper rods forms a double insertion, making the connection more secure. At the same time, the copper rod is equipped with a strap contact finger 5, which allows the connecting copper rod 25 on the three-position pole and the busbar connecting copper rod to slide and connect, ensuring more effective connection between conductors, good conductivity, and reduced temperature rise. When the lower part of the busbar lower connecting pipe 14 is inserted into the slot on the three-position pole, the polyester sealing sleeve is compressed, completely filling the gap between the busbar lower connecting pipe 14 and the slot on the three-position pole, thus ensuring the sealing between the two.

[0044] After the three-position pole 2 and bus bushing 1 are assembled, the lower end of the bus copper rod 16 is connected to the connecting copper rod 25 on the three-position pole, so as to conduct the parallel voltage to the bus bushing 1. The upper end of the bus copper rod 16 has a mounting hole 15, which is connected to the bus cable bolt through the mounting hole 15, so as to conduct the parallel voltage to the bus cable.

[0045] After the feeder bushing 4, circuit breaker pole 3, and three-position switch pole are spliced ​​together, they are all on the same vertical plane. As a result, the horizontal space occupied by these three is very small, effectively saving space inside the cabinet. If there are two or more lines, the busbar bushing 1 can be installed at different angles relative to the three-position pole 2 according to the different phase sequences, so as to facilitate the differentiation of different phase sequences.

[0046] This invention is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A switching device for a three-position circuit breaker in a solid-insulated switchgear, characterized in that: This includes a feeder bushing, which is connected to the circuit breaker pole via a combination of the feeder sealing connection structure and the circuit breaker lower sealing connection structure. The circuit breaker pole is connected to the three-position switch pole via a combination of the circuit breaker upper sealing connection structure and the three-position lower sealing connection structure. The three-position switch pole is connected to the busbar bushing via a combination of the three-position upper sealing connection structure and the busbar lower sealing connection structure.

2. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 1, characterized in that: The feeder bushing includes a feeder insulation shell, inside which multiple feeder interfaces are arranged side by side. The lower end of each feeder interface is connected to the bottom of the feeder insulation shell, and the upper end of each feeder interface is connected to the lower end of a feeder copper pillar. The lower part of the feeder copper pillar is hollow and connected to the upper end of the feeder interface. The upper end of the feeder copper pillar is connected to the feeder copper core, which is located on the upper part of the feeder insulation shell. An external connecting pipe is provided on one side of the feeder insulation shell, and an auxiliary copper pillar is provided inside the external connecting pipe. An auxiliary insertion port is opened on the outer side of the auxiliary copper pillar, and the inner side of the auxiliary copper pillar is connected to one end of the feeder copper core. The top of one side of the feeder insulation shell is connected to a feeder sealing connection structure, and a feeder connecting copper rod is provided inside the feeder sealing connection structure. The lower end of the feeder connecting copper rod is connected to one end of the feeder copper core.

3. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 2, characterized in that: The circuit breaker pole includes a circuit breaker insulating shell, inside which a vacuum bulb is installed. One end of the vacuum bulb is connected to the upper end of the lower connecting copper rod of the circuit breaker, and the other end of the vacuum bulb is connected to the lower end of the upper connecting copper rod of the circuit breaker. An insulating channel for inserting an insulating rod is opened inside the circuit breaker insulating shell. One end of the insulating channel is connected to the other end of the vacuum bulb, and the other end of the insulating channel passes through the other side of the feeder insulating shell. The top middle part of the circuit breaker insulating shell is connected to the upper sealing connection structure of the circuit breaker. The upper connecting copper rod of the circuit breaker is set inside the upper sealing connection structure of the circuit breaker, and the lower connecting copper rod of the circuit breaker is set inside the lower sealing connection structure of the circuit breaker. The lower sealing connection structure of the circuit breaker is located at the bottom of one side of the circuit breaker insulating shell.

4. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 2, characterized in that: The three-position switch pole includes a three-position insulating shell, inside which is a three-position vacuum interrupter. One end of the three-position vacuum interrupter is connected to the lower end of the upper connecting copper rod, and the other end is connected to the lower end of the grounding copper rod. The upper end of the grounding copper rod extends out of the top of the three-position insulating shell. The upper connecting copper rod is located within the upper sealing connection structure, which is located at the top of one side of the three-position insulating shell. The other end of the three-position vacuum interrupter is connected to an opening on the other side of the three-position insulating shell. The middle part of the three-position vacuum interrupter is connected to the upper end of the lower connecting copper rod, which is located within the lower sealing connection structure, which is located at the bottom center of the three-position insulating shell.

5. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 4, characterized in that: The busbar bushing includes a busbar insulation shell. One end of the busbar insulation shell is connected to the bottom of the busbar lower sealing connection structure. The other end of the busbar insulation shell is vertically upwardly provided with a busbar upper connecting pipe. A busbar copper rod is provided inside the busbar insulation shell, the busbar lower sealing structure, and the busbar upper connecting pipe. The upper end of the busbar copper rod passes through the busbar upper connecting pipe and has an installation hole.

6. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 5, characterized in that: The feeder sealing connection structure includes a feeder upper connecting tube, the lower end of which is connected to the top of one side of the feeder insulation shell, a feeder flange is provided in the middle of the feeder upper connecting tube, the upper part of the feeder upper connecting tube is machined into a frustum shape, a feeder connecting copper rod is placed in the feeder upper connecting tube, and a feeder upper insertion port is opened on the upper part of the feeder connecting copper rod. The circuit breaker lower sealing connection structure includes a circuit breaker lower connecting pipe. The lower end of the lower connecting pipe is connected to the bottom of one side of the circuit breaker insulation shell. A frustum-shaped circuit breaker lower slot matching the upper part of the feeder line connecting pipe is opened inside the circuit breaker lower connecting pipe. A circuit breaker lower connecting copper rod is set inside the circuit breaker lower connecting pipe. A watch strap contact finger is set on the lower outer periphery of the circuit breaker lower connecting copper rod. The upper part of the feeder line connecting pipe is inserted into the circuit breaker lower slot, and the lower part of the circuit breaker lower connecting copper rod is inserted into the feeder line insertion port at the upper part of the feeder line connecting copper rod. The feeder flange is bolted to the bottom of the circuit breaker lower connecting pipe.

7. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 6, characterized in that: The sealing connection structure on the circuit breaker includes an upper connecting pipe on the circuit breaker. The lower end of the upper connecting pipe is connected to the middle top of the circuit breaker insulation shell. An inverted frustum-shaped slot is opened inside the upper connecting pipe. An upper connecting copper rod is set inside the upper connecting pipe. A watch strap contact finger is provided on the upper outer periphery of the upper connecting copper rod. The three-position sealed connection structure includes a three-position lower connecting pipe, the upper end of which is connected to the bottom middle of the three-position insulating shell. A three-position flange is provided in the middle of the three-position lower connecting pipe. The lower part of the three-position lower connecting pipe is machined into an inverted frustum shape to match the upper slot of the circuit breaker. A three-position lower connecting copper rod is placed in the three-position lower connecting pipe. A three-position lower insertion port is opened at the lower part of the three-position lower connecting copper rod. The lower part of the three-position lower connecting pipe is inserted into the upper slot of the circuit breaker, and the upper part of the upper connecting copper rod of the circuit breaker is inserted into the lower insertion port of the lower connecting copper rod. The three-position flange is bolted to the top of the upper connecting pipe of the circuit breaker.

8. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 7, characterized in that: The three-position sealing connection structure includes a three-position connecting tube. The lower end of the three-position connecting tube is connected to the top of one side of the three-position insulating shell. An inverted frustum-shaped three-position slot is opened inside the three-position connecting tube. A three-position connecting copper rod is set inside the three-position connecting tube. A watch strap contact finger is set on the upper outer periphery of the three-position connecting copper rod. The busbar sealing connection structure includes a lower busbar connecting pipe. The upper end of the lower busbar connecting pipe is connected to the bottom of one end of the busbar insulation shell. A busbar flange is provided in the middle of the lower busbar connecting pipe. The lower part of the lower busbar connecting pipe is machined into an inverted frustum shape to match the slot on the three-position. The lower part of the busbar copper rod is placed in the lower busbar connecting pipe. A lower busbar insertion port is opened in the lower part of the busbar copper rod. The lower part of the lower busbar connecting pipe is inserted into the slot on the three-position, and the upper part of the connecting copper rod on the three-position is inserted into the lower busbar insertion port of the lower part of the busbar copper rod. The busbar flange is bolted to the top of the connecting pipe on the three-position.

9. The switching device for a three-position circuit breaker in a solid-insulated switchgear according to claim 8, characterized in that: Polyester sealing sleeves are provided on the upper outer periphery of the feeder line connecting pipe, the lower outer periphery of the three-position lower connecting pipe, and the lower outer periphery of the busbar connecting pipe.

10. A switching device for a three-position circuit breaker in a solid-insulated switchgear according to any one of claims 1-9, characterized in that: The feeder bushing, circuit breaker pole, and three-position switch pole are all located on the same vertical plane.

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