A combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet

Abstract

A combination of a three-position disconnector and a circuit breaker suitable for use in an inflatable cabinet. The circuit breaker's sealed pole and the switch mechanism for the three-position disconnector are mounted on the same side of the cabinet's sealed mounting plate. The sealed pole is located below the switch mechanism and provides a support and mounting location for the switch mechanism. The switch mechanism includes a drive screw and a grounding contact holder, an intermediate contact, and a static contact holder arranged in sequence along the drive screw's axial direction. The drive screw is arranged in the same direction and parallel to the sealed pole. The grounding contact holder is mounted on the sealed mounting plate. The intermediate contact and the static contact holder are supported by the sealed pole. The intermediate contact includes a movable contact for mating with the grounding contact holder or the static contact holder. Driven by the drive screw, the movable contact can move linearly or swing between the ends of the drive screw. This combination allows knife-type and direct-acting three-position disconnectors to be co-located in the same inflatable cabinet, reducing the design requirements for the inflatable cabinet.

Description

Technical Field

[0001] The present invention relates to the field of medium-voltage circuit breakers, and in particular to a combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet. Background Art

[0002] At present, the three-position disconnectors installed in the inflatable cabinet are divided into two types: direct-acting and knife-switch types. The direct-acting three-position disconnectors are smaller in size and have a uniform electric field distribution, but are more expensive. The knife-switch three-position disconnectors are lower in cost and have good heat dissipation effects, but have an uneven electric field distribution. Since the transmission methods of these two three-position disconnectors are different, the operating mechanisms are not unified and have different motion trajectories. When the three-position disconnector is direct-acting, the sealed pole of the circuit breaker is parallel to the three-position disconnector, and the motion trajectory of the moving contact of the three-position disconnector is a straight line. When the three-position disconnector is knife-switch type, the sealed pole of the circuit breaker and the three-position disconnector need to be vertically set. Since the motion trajectory of the moving contact of the three-position disconnector is an arc, and the mutually perpendicular combination occupies a large space in the cabinet, in addition, it is difficult for the combination of the two three-position disconnectors and the circuit breaker to form a unified combination in the gas-filled cabinet, and the two combination methods are difficult to share. Therefore, it is necessary to design an gas-filled cabinet for each combination method, which not only increases the design cost, but also is not conducive to the flexible use of the two three-position disconnectors. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet with a simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet, wherein the three-position disconnector and the circuit breaker are arranged on a sealed mounting plate in the inflatable cabinet, and a sealed pole of the circuit breaker and a switch device of the three-position disconnector are installed on the same side of the sealed mounting plate. The sealed pole is located below the switch device and provides a support and installation site for the switch device; the switch device includes a transmission screw and a grounding contact seat, an intermediate contact, and a static contact seat arranged in sequence. The transmission screw is arranged in parallel with the sealed pole in the same direction, and the grounding contact seat is arranged Installed on the sealed mounting plate, the intermediate contact and the static contact seat are supported by the sealed pole, and a first terminal on which the intermediate contact can be fixedly installed and rotatably installed is provided on one side of the middle part of the sealed pole. The intermediate contact includes a moving contact for cooperating with the grounding contact seat or the static contact seat. The intermediate contact is fixedly connected to the first terminal, and the moving contact moves linearly between the two ends of the transmission screw under the drive of the transmission screw, or the intermediate contact is rotatably connected to the first terminal, and the moving contact swings between the two ends of the transmission screw under the drive of the transmission screw.

[0006] Furthermore, the first terminal includes a connecting plate with one end extending out of the insulating housing for connecting to the intermediate contact of the switching device, and the end of the connecting plate extending out of the insulating housing serves as a connecting portion, and a bolt hole is provided on the connecting portion. The connecting portion is arranged along the axial direction of the sealed pole, and the central axis of the bolt hole is perpendicular to the axial direction of the sealed pole.

[0007] Furthermore, the intermediate contact includes a first movable contact sleeved on the transmission screw. When the transmission screw rotates, the transmission screw causes the first movable contact to perform linear motion between the two ends of the transmission screw.

[0008] Furthermore, the intermediate contact also includes a three-way intermediate contact seat, the lower part of the three-way intermediate contact seat is connected to the first terminal of the sealed pole, and the upper part of the three-way intermediate contact seat is sleeved on the transmission screw. The first moving contact can slide through the upper part of the three-way intermediate contact seat when it makes a linear motion on the transmission screw.

[0009] Furthermore, both side edges of the lower portion of the intermediate contact seat protrude outward to form two relatively spaced connection ridges for connecting to the first terminal, and connection holes are provided on the connection ridges.

[0010] Furthermore, the intermediate contact includes a second moving contact and a driving member, the second moving contact has a connecting end and a free end, the connecting end is rotatably connected to the first terminal of the sealed pole, and the free end is used to cooperate with the grounding contact seat or the static contact seat, and a guide groove for cooperating with the driving member is provided on the second moving contact, and the driving member is installed on the transmission screw. Under the drive of the transmission screw, the driving member performs a linear motion between the two ends of the transmission screw, and at the same time, the driving member cooperates with the two side edges of the guide groove to make the second moving contact swing at the two ends of the transmission screw for cooperating with the grounding contact seat or the static contact seat.

[0011] Furthermore, the second moving contact includes two relatively arranged disc springs, one end of the two disc springs serving as a connecting end and being rotatably connected to the first terminal of the sealed pole, the ends of the two disc springs at the connecting end are provided with disc spring connecting holes, and a gap is left between the ends of the two disc springs for the first terminal to extend into, the other ends of the two disc springs are connected together as the free end of the second moving contact, a gap is left between the two disc springs for the transmission screw to pass through, and a guide groove is provided in the middle of each disc spring.

[0012] Furthermore, the driving member is a linear threaded sleeve mounted on the transmission screw, and the inner side wall of the driving member is provided with a thread that cooperates with the outer side wall of the transmission screw. When the transmission screw rotates, the driving member can make a linear motion on the transmission screw; the side walls of the driving member and the two side limits of the guide groove are matched to make the second moving contact swing between the two ends of the transmission screw. After the second moving contact swings toward one end of the transmission screw, the driving member makes a linear motion on the transmission screw and the side walls of the driving member and the guide groove are slidably matched.

[0013] Furthermore, the contact position of the grounding contact seat is located above the connection between the transmission screw and the sealing mounting plate, and the static contact on the static contact seat is located above the connection between the static contact seat and the transmission screw, and the static contact corresponds to the contact position of the grounding contact seat.

[0014] Furthermore, a first wire threading hole is provided on the outer wall of one side of the insulating shell, and the first terminal extends out of the insulating shell through the first wire threading hole for connection with the intermediate contact in the switching device. An annular protrusion is provided around the outer periphery of the first wire threading hole. The connecting plate is a rectangular connecting plate, and one end is provided with a notch that can be engaged with one side of the first wire threading hole. The end extending out of the first wire threading hole serves as a connecting portion, and the connecting portion protrudes from the annular protrusion.

[0015] Furthermore, one end of the sealed pole is connected to the sealing mounting plate as a supporting end, the other end of the sealed pole is a second terminal and a supporting boss is provided on the side of the second terminal close to the switching device, a first terminal is provided in the middle of the sealed pole, and the static contact seat is provided on the supporting boss.

[0016] Furthermore, the intermediate contact is connected to the first terminal of the sealed pole via bolts, and a voltage balancing structure for improving electric field distribution is provided at the connection of the bolts.

[0017] Furthermore, the three-position disconnector further includes a first operating mechanism for driving the transmission screw to rotate, and the circuit breaker further includes a second operating mechanism connected to the sealed pole, and the first operating mechanism and the second operating mechanism are installed on the other side of the sealed mounting plate.

[0018] The present invention provides a combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet, wherein the sealed pole and the transmission screw of the switch device are arranged in the same direction and in parallel, the sealed pole can fix the intermediate contact and can rotatably install the intermediate contact, and the moving contact can make a linear motion between the two ends of the transmission screw under the drive of the transmission screw, or the intermediate contact is rotatably connected to the first terminal, and the moving contact swings between the two ends of the transmission screw, and the motion trajectory of the moving contact is uniformly set on the plane where the transmission screw is located, wherein the linear motion trajectory of the moving contact corresponds to the motion trajectory of the moving contact of the direct-acting three-position disconnector, and the swinging of the moving contact corresponds to the motion trajectory of the moving contact of the knife-switch type three-position disconnector, which can simultaneously meet the space requirements of different three-position disconnectors. This combination can enable the knife-switch type three-position disconnector and the direct-acting three-position disconnector to be set together in an inflatable cabinet, reducing the design requirements for the inflatable cabinet, and the direct-acting and knife-switch type three-position disconnectors can be flexibly replaced and can be widely used.

[0019] In addition, the first terminal and the middle contact of the switching device form a plug-in structure, which enhances the connection stability between the switching device and the sealed pole; in addition, a voltage-equalizing structure that improves the electric field distribution is provided at the connection between the first terminal and the middle contact to prevent the problem of uneven electric field distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1-5 This is a structural diagram of a combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet (a direct-acting three-position disconnector);

[0021] Figure 6 yes Figure 5 A magnified view of part B in FIG;

[0022] Figure 7 yes Figure 5 Enlarged view of part C in FIG;

[0023] Figure 8 This is a structural schematic diagram of a three-way middle contact seat in a combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to the present invention;

[0024] Figure 9-12This is a structural diagram of a combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet (a knife-type three-position disconnector);

[0025] Figure 13-15 This is a structural schematic diagram of a sealed pole in a combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet according to the present invention;

[0026] Figure 16-17 This is a structural schematic diagram of a sealed pole and a sealed mounting plate in a combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet according to the present invention;

[0027] Figure 18 The present invention is a structural schematic diagram of a sealing mounting plate in a combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet. DETAILED DESCRIPTION

[0028] The following is combined with Figures 1 to 18 The following examples further illustrate a specific embodiment of a combination of a three-position disconnector and a circuit breaker for an inflatable cabinet according to the present invention. The following examples are not limited to the following embodiments.

[0029] A combination of a three-position disconnector and a circuit breaker suitable for an inflatable cabinet, wherein the three-position disconnector and the circuit breaker are arranged on a sealed mounting plate 8 in the inflatable cabinet, the three-position disconnector includes a first operating mechanism 1 and a switching device connected to the first operating mechanism 1, and the circuit breaker includes a second operating mechanism 6 and a sealed pole 7 connected to the second operating mechanism 6; the switching device and the sealed pole 7 are installed on one side of the sealed mounting plate 8, and the first operating mechanism 1 and the second operating mechanism 6 are installed on the other side of the sealed mounting plate 8; the sealed pole 7 is located below the switching device and provides a support and installation site for the switching device.

[0030] The switch device includes a transmission screw 5 and a grounding contact seat 2, an intermediate contact 3, and a static contact seat 4 arranged in sequence along the axial direction of the transmission screw 5. The transmission screw 5 is arranged in the same direction and parallel to the sealed pole 7. The transmission screw 5 is located above the sealed pole 7. The transmission screw 5 rotates under the drive of the first operating mechanism 1. The grounding contact seat 2 is installed on the sealing mounting plate 8. The intermediate contact 3 and the static contact seat 4 are supported by the sealed pole 7. A first terminal 74 and a second terminal 75 are provided on the sealed pole 7. The first terminal 74 is connected to the intermediate contact 3. Preferably, the first terminal 74 is plugged into the intermediate contact 3, and the second terminal 75 is connected to the busbar in the inflatable cabinet. The intermediate contact 3 includes a moving contact for cooperating with the grounding contact seat 2 or the static contact seat 4. When the intermediate contact 3 is fixedly connected to the first terminal 74, the moving contact can make a linear motion between the two ends of the transmission screw 5 under the drive of the transmission screw 5, or when the intermediate contact 3 is rotationally connected to the first terminal 74, the moving contact swings between the two ends of the transmission screw 5.

[0031] Preferably, the transmission screw 5 passes through the sealing mounting plate 8 and is supported on the static contact seat 4. The grounding contact seat 2 and the static contact seat 4 are arranged opposite to each other along the axial direction of the transmission screw 5. The static contact seat 4 is preferably an L-shaped static contact seat 4. The L-shaped static contact seat 4 includes a short arm 41 and a long arm 42. The short arm 41 is supported on the support boss 77. The two ends of the transmission screw 5 are supported on the long arm 42 and the sealing mounting plate 8. A static contact point 43 for cooperating with the moving contact is protruding from the side of the long arm 42 facing the sealing mounting plate 8.

[0032] In this combination, the linear motion trajectory of the moving contact and the movement of the moving contact in the direct-acting three-position disconnector are both driven by the transmission screw 5, thereby providing a first embodiment suitable for the direct-acting three-position disconnector.

[0033] Combine Figure 1-8 The present invention introduces in detail the combination of a three-position disconnector and a circuit breaker in which the movable contact performs linear motion on the transmission screw 5. The switch device includes a transmission screw 5 and a grounding contact seat 2, an intermediate contact 3, and a static contact seat 4 arranged in sequence along the axial direction of the transmission screw 5.

[0034] like Figure 1-2As shown, the grounding contact seat 2 is arranged on the sealing mounting plate 8, the transmission screw 5 passes through the middle of the grounding contact seat 2, and the contact position of the grounding contact seat 2 surrounds the connection between the transmission screw 5 and the grounding contact seat 2. The static contact seat 4 includes an L-shaped structure, and the L-shaped structure includes a short arm 41 and a long arm 42. The short arm 41 is supported on the support boss 77 of the sealed pole 7, and the two ends of the transmission screw 5 are supported on the long arm 42 and the sealing mounting plate 8. A static contact 43 for cooperating with the first moving contact 301 is provided on the side of the long arm 42 facing the sealing mounting plate 8. The static contact 43 is located at the connection with the transmission screw 5 and surrounds the outer periphery of the connection.

[0035] like Figure 1-5 As shown, the intermediate contact 3 includes a first moving contact 301 and a three-way intermediate contact seat 302 which are sleeved on the transmission screw 5. The lower part of the three-way intermediate contact seat 302 is connected to the middle part of the sealed pole 7, and the upper part of the three-way intermediate contact seat 302 is sleeved on the transmission screw 5. When the first moving contact 301 makes a linear motion on the transmission screw 5, it can slide through the upper part of the three-way intermediate contact seat 302. The two ends of the first moving contact 301 can respectively cooperate with the grounding contact seat 2 and the static contact seat 4.

[0036] like Figure 4 As shown, the first moving contact 301 is a conductive slider that slidably cooperates with the three-way intermediate contact base 302. A through-hole for the transmission screw 5 to pass through is provided in the middle of the first moving contact 301. The inner sidewall of the through-hole is provided with a thread that cooperates with the outer sidewall of the transmission screw 5. When the transmission screw 5 rotates, the transmission screw 5 causes the first moving contact 301 to perform linear motion between the two ends of the transmission screw 5 to cooperate with the grounding contact base 2 and the static contact base 4, respectively. When the transmission screw 5 rotates in the forward direction under the drive of the first operating mechanism 1, the first moving contact 301 rotates to the end of the transmission screw 5 away from the sealing mounting plate 8 to cooperate with the static contact base 4. When the transmission screw 5 moves in the reverse direction under the drive of the first operating mechanism 1, the first moving contact 301 rotates to the end close to the sealing mounting plate 8 to cooperate with the grounding contact base 2.

[0037] like Figure 4-8 As shown, the upper portion of the three-way intermediate contact seat 302 is provided with a sliding cavity for slidingly cooperating with the first moving contact 301. Figure 8As shown in , the upper portion of the three-way intermediate contact base 302 is hollow cylindrical. The cavity provided in the upper portion serves as a sliding cavity for the sliding engagement of the first movable contact 301. Driven by the transmission screw 5, both ends of the first movable contact 301 can be extended out of the sliding cavity to engage with the grounding contact base 2 or the static contact base 4. When one end of the first movable contact 301 engages with the grounding contact base 2 or the static contact base 4, the other end of the first movable contact 301 remains within the sliding cavity. Conductive contact fingers are provided at the end of the three-way intermediate contact base 302 near the static contact base 4. These conductive contact fingers engage with the end of the first movable contact 301 away from the static contact base 4, maintaining electrical continuity when the first movable contact 301 engages with the static contact base 4. The lower part of the three-way intermediate contact seat 302 is cylindrical, and one end is connected to the middle part of the upper part, so that the three-way intermediate contact seat 302 is a T-shaped structure as a whole. The edges of both sides of one end of the lower part of the three-way intermediate movable contact seat 302 protrude outward to form two opposite connecting convex edges 303. Figure 8 In the embodiment, the two connecting flanges 303 are rectangular, with connecting holes provided on the connecting flanges 303 and bolts installed in the connecting holes. A gap is left between the two connecting flanges 303 for connection to the sealed pole 7. Preferably, the first terminal 74 of the sealed pole 7 can extend into the gap between the two connecting flanges 303. With the cooperation of the connecting flanges 303 and the bolts, the first terminal 74 forms a plug-in structure with the three-way intermediate contact seat 302. Furthermore, a voltage balancing structure is provided at the location where the bolts are installed to improve the electric field distribution. Preferably, the connecting hole is configured as a countersunk hole to optimize the electric field distribution.

[0038] In this combination, the swinging motion trajectory of the moving contact between the two ends of the transmission screw 5 is the same as the motion trajectory of the moving contact in the knife-type three-position disconnector, thus providing a second embodiment suitable for the knife-type three-position disconnector.

[0039] Combine Figure 9-12 This article introduces in detail a combination of a three-position disconnector and a circuit breaker in which the movable contact swings between the two ends of a transmission screw 5. The switch device includes a transmission screw 5 and a grounding contact seat 2, an intermediate contact 3, and a static contact seat 4 arranged in sequence along the axial direction of the transmission screw 5.

[0040] like Figure 9 、 10As shown, the grounding contact seat 2 is arranged on the sealing mounting plate 8, and the contact position of the grounding contact seat 2 is located on one side of the transmission screw 5 and corresponds to the contact position of the static contact. The static contact seat 4 includes an L-shaped structure, and the L-shaped structure includes a short arm 41 and a long arm 42. The short arm 41 is supported on the support boss 77, and the two ends of the transmission screw 5 are supported on the long arm 42 and the sealing mounting plate 8. A static contact 43 for cooperating with the first moving contact 301 is provided on the side of the long arm 42 facing the sealing mounting plate 8. The static contact 43 is located on one side of the connection between the long arm 42 and the transmission screw 5. Figure 10 In the figure, the contact position of the grounding contact seat 2 is located above the connection between the transmission screw 5 and the sealing mounting plate 8, and the static contact 43 is located above the connection between the long arm 42 and the transmission screw 5. The static contact 43 corresponds to the contact position of the grounding contact seat 2.

[0041] like Figure 11-12 As shown, the intermediate contact 3 includes a second moving contact 311 and a driving member 312. The second moving contact 311 is rotatably mounted on the first terminal 74 of the sealed pole 7. A guide groove 313 is provided on the second moving contact 311 for cooperating with the driving member 312. The driving member 312 is mounted on the transmission screw 5. Under the drive of the transmission screw 5, the driving member 312 makes a linear motion between the two ends of the transmission screw 5. At the same time, the driving member 312 cooperates with the two side edges of the guide groove 313 to make the second moving contact 311 swing at the two ends of the transmission screw 5 for cooperating with the grounding contact seat 2 or the static contact seat 4.

[0042] like Figure 10 As shown, the second moving contact 311 has a connecting end 311a and a free end 311b. The connecting end 311a is rotatably connected to the first terminal 74 of the sealed pole 7, and the free end 311b is used to cooperate with the grounding contact seat 2 or the static contact seat 4. A long circular hole-shaped guide groove 313 is provided between the connecting end 311a and the free end 311b. The driving member 312 is installed on the transmission screw 7. A protrusion structure that extends into the guide groove 313 and slides in cooperation is provided at both ends of the driving member 312. The protrusion structure of the driving member 312 slides in the guide groove 313 and cooperates with the two side edges of the guide groove 313 so that the driving member 312 can drive the free end 311b of the second moving contact 311 to swing at both ends of the transmission screw 5 when performing linear motion. Preferably, one end of the guide groove 313 serves as a limit end 313a (see Figure 11 ), the limiting end 313a is located at one end close to the connecting end 311a. When the second moving contact 311 rotates to be perpendicular to the transmission screw 5, the limiting end 313a cooperates with the protruding structure of the driving member 312.

[0043] Combine Figure 9-12A second moving contact 311 is provided. The second moving contact 311 includes two disc springs disposed opposite each other, one end of each disc spring serving as a connection end 311a that is rotatably connected to the sealed pole 7. Preferably, disc spring connection holes are provided at the ends of the two disc springs forming the connection end 311a, and a gap is left between the ends of the two disc springs for the first terminal 74 to extend into. The first terminal 74 extends into the gap to form a rotatable plug-in structure with the connection end 311a of the second moving contact 311. Bolts are inserted through the disc spring connection holes and bolt holes for installation, thereby enhancing the connection stability between the second moving contact 311 and the first terminal 74. Preferably, the connection end 311a of the second moving contact 311 is connected to the first terminal 74 via bolts, and a voltage grading structure for improving electric field distribution is provided at the bolt connection. In this embodiment, a voltage grading ring is preferably provided at the bolt installation location. The other ends of the two disc springs are connected together as the free end 311b of the second moving contact 311. A gap is left between the two disc springs for the transmission screw 5 to pass through. A long circular hole-shaped guide groove 313 is provided in the middle of each disc spring. Preferably, the end of the guide groove 313 close to the connecting end 311a serves as the limiting end 313a.

[0044] It should be noted that after the driving member 312 drives the second moving contact 311 to rotate, the displacement length of the driving member 312 continuing to make linear motion along the transmission screw 5 has a certain influence on the cooperation between the second moving contact 311 and the grounding contact seat 2 and the static contact seat 4. As the displacement length of the driving member 312 continues to extend, the driving member 312 continues to cooperate with the guide groove 313, so that the free end 311b of the second moving contact 311 is further turned toward the grounding contact seat 2 or the static contact seat 4, which is conducive to enhancing the cooperation stability of the free end 311b. Due to the movement range of the driving member 312 Usually between the grounding contact seat 2 and the static contact seat 4, that is, the stroke of the driving member 312 is less than the distance between the grounding contact seat 2 and the static contact seat 4, the guide groove 313 can be a hole closed at both ends, or it can be an open groove with one end closed and the other end open, and the closed end is located on the side of the guide groove 313 close to the connecting end 311a. Preferably, a limiting end 313a is provided in the guide groove 313, and the limiting groove 313a is located on the side of the guide groove 313 close to the connecting end 311a. The closed limiting end 313a cooperates with the driving member 312 when the second moving contact 311 rotates to a position perpendicular to the transmission screw 5. Of course, the guide groove 313 can also be a strip groove with both ends open, and the limit end 313a is not set in this case; the shape of the second moving contact 311 is not limited to the disc spring, and it can also be a rod or other structure that can achieve swinging. Of course, the second moving contact 311 can also be formed by only a single disc spring, but the connection structure between the single disc spring and the first terminal 74 is not a plug-in structure, and the matching stability of the single disc spring, the driving member 312 and the transmission screw 5 is poor, and it is easy to tilt to one side, resulting in poor matching with the grounding contact seat 2 or the static contact seat 4.

[0045] The driving member 312 is a linear threaded sleeve mounted on the transmission screw 5. The inner side wall of the driving member 312 is provided with a thread that matches the outer side wall of the transmission screw 5. When the transmission screw 5 rotates, the driving member 312 can make a linear motion on the transmission screw 5. The side walls of the driving member 312 and the two side limits of the guide groove 313 are used to make the second moving contact 311 swing between the two ends of the transmission screw 5. Preferably, a circular protrusion structure for matching with the limit groove 313 is provided on each of the two side walls of the driving member 312. After the second moving contact 311 swings toward one end of the transmission screw 5, the driving member 312 makes a linear motion on the transmission screw 5 and the side walls of the driving member 312 and the guide groove 313 slide together. Figure 9-12As shown, the second moving contact 311 is perpendicular to the transmission screw 5 in the initial state, so the guide groove 313 on the second moving contact 311 is also perpendicular to the transmission screw 5, and the driving member 312 is located at the limit end 313a of the guide groove 313. When the transmission screw 5 rotates in the positive direction under the drive of the first operating mechanism 1, the driving member 312 has a tendency to move linearly in the direction close to the static contact seat 4 under the action of the transmission screw 5. At the same time, the circular protrusion structure on the side wall of the driving member 312 cooperates with the two side edge limits of the guide groove 313. The movement trend of the driving member 312 causes the second moving contact 311 to rotate and the free end 311b of the second moving contact 311 to turn toward the static contact seat 4. As the transmission screw 5 continues to rotate, the guide groove 313 gradually tilts from the previous direction perpendicular to the transmission screw 5 to the direction close to the static contact seat 4, and the driving member 312 continues to move on the transmission screw 5 to approach the static contact seat 4. The second movable contact 311 rotates back to the original position, and the circular limiting protrusion structure on the driving member 312 is in the same position as the limiting protrusion structure on the driving member 312. Similarly, when the transmission screw 5 rotates in the opposite direction under the drive of the first operating mechanism 1, the driving member 312 tends to move linearly in the direction close to the grounding contact seat 2 under the action of the transmission screw 5. At the same time, the circular protrusion structure on the side wall of the driving member 312 cooperates with the two side edges of the limiting groove 313. The movement trend of the driving member 312 causes the second moving contact 311 to rotate and the free end 311b of the second moving contact 311 to turn toward the grounding contact seat 2. As the transmission screw 5 continues to rotate, the guide groove 313 gradually tilts from the previous direction perpendicular to the transmission screw 5 to the direction close to the grounding contact seat 2, and the driving member 312 The transmission screw 5 makes a linear motion in the direction close to the grounding contact seat 2, and at the same time, the driving member 312 also slides along the guide groove 313 in the direction away from the limit end 313a, and when the second moving contact 311 does not need to cooperate with the grounding contact seat 2, the transmission screw 5 rotates forward, and the driving member 312 slides along the guide groove 313 in the direction close to the limit end 313a and makes a linear motion away from the grounding contact seat 2 on the transmission screw 5, and the driving member 312 and the two side edges of the guide groove 313 are limited to cooperate to cause the second moving contact 311 to rotate and return to its initial state. At this time, the circular limit protrusion structure on the driving member 312 cooperates with the limit end 313a.

[0046] like Figure 13-18As shown, the sealed pole 7 for supporting the switch device includes an insulating shell 71, one end of the insulating shell 71 is used as a supporting end for supporting and connecting with the sealed mounting plate 8 (see 16-18), and the other end face of the insulating shell 71 is provided with a second threading hole, and the outer wall on the same side of the insulating shell 71 is provided with a first threading hole and a supporting boss 77 whose central axes coincide with each other. The first threading hole is located in the middle of the insulating shell 71, and the supporting boss 77 is located on the side away from the supporting end for supporting the static contact seat 4 in the switch device. A conductive component chamber 72 and a sealed vacuum interrupter 7 are provided inside the insulating shell 71. 3. A moving end 731 of the vacuum interrupter 73, which is used to connect to the moving contact of the circuit breaker, is provided with a first terminal 74. The first terminal 74 extends out of the insulating housing 71 through a first wire hole for connection to the intermediate contact 3 in the switch device. A static end 732 of the vacuum interrupter 73, which is used to connect to the static contact of the circuit breaker, is provided with a second terminal 75. The second terminal 75 corresponds to the second wire hole. The second terminal 75 is connected to the busbar in the gas cabinet through the second wire hole. The second terminal 75 located at the end is conducive to connection with the busbar of the gas cabinet, making the line connection in the gas cabinet simpler.

[0047] like Figure 15 、 16 As shown, at least two through holes 76 are provided on the side wall of the conductive member chamber 72. The through holes 76 are located on the side close to the sealing mounting plate 8. The through holes 76 are used to dissipate heat from the interior of the sealed pole 7. At the same time, a detection probe for detecting the internal temperature of the sealed pole 7 can be placed into the conductive member chamber 72 through the through holes 76 without destroying the sealed pole 7, thereby solving the problem of the difficulty of burying the traditional sealed pole 7. Preferably, two opposing through holes 76 are provided on the side wall of the conductive member chamber 72. The two opposing through holes 76 are used for convection heat dissipation of the conductive member chamber 72.

[0048] Furthermore, the insulating shell 71 is preferably made of a dark insulating material. Usually, the insulating shell 71 is formed by casting epoxy resin. The dark insulating shell 71 is made by adding a dark pigment with high emissivity to the epoxy resin material, thereby improving the heat dissipation effect of the insulating shell 71; the outer surface of the insulating shell 71 is preferably frosted, which is conducive to increasing the surface area and increasing the heat dissipation.

[0049] like Figure 15 、 16As shown, a moving guide rod connected to the moving end 731 of the vacuum arc extinguishing chamber 73 is provided in the conductive member chamber 72, and the moving guide rod is arranged throughout the conductive member chamber 72, one end of the moving guide rod is connected to the moving end 731, and the other end passes through the conductive member chamber 72, the support end and the sealing mounting plate 8 and is connected to the operating mechanism. The inner diameter of the conductive member chamber 72 is larger than the inner diameter of the vacuum arc extinguishing chamber 73, so that one side wall of the conductive member chamber 72 is smoothly connected to one side wall of the vacuum arc extinguishing chamber 73, and the other side wall of the conductive member chamber 72 is located outside the other side wall of the vacuum arc extinguishing chamber 73. The other side wall of the conductive member chamber 72 is connected to the other side wall of the vacuum arc extinguishing chamber 73, and the first wiring hole is provided at the connection, which increases the volume of the conductive member chamber 72 and provides sufficient activity space for the moving guide rod to prevent a large amount of heat from accumulating at the connection between the moving guide rod and the first wiring terminal 74 and the moving end 731, affecting product performance.

[0050] like Figure 15 、 16As shown, the first terminal 74 includes a flexible connection 741 and a connecting plate 742. One end of the flexible connection 741 is used to connect to the moving end 731 of the vacuum interrupter 73 and one end connected to the moving guide rod, and the other end of the flexible connection 741 is connected to the connecting plate 742. The connecting plate 742 is arranged along the axial direction of the sealed pole 7, and one end of the connecting plate 742 extends out of the insulating housing 71 through the first wire threading hole for connection to the middle contact 3 of the switching device. Preferably, the connecting plate 742 is a rectangular connecting plate 742, and a notch 742a that can be engaged with one side of the first wire threading hole is provided at one end thereof for connecting to the soft connection 741, and the end extending out of the first wire threading hole serves as a connecting portion, and the protruding height of the connecting portion is greater than the height of the supporting boss 77 and a penetrating bolt hole is provided at the connecting portion. The connecting portion is arranged along the axial direction of the sealed pole 7, and the central axis of the bolt hole is perpendicular to the axial direction of the sealed pole 7. The connecting portion is connected to the intermediate contact 3 in the switch device to form a plug-in structure, which can provide support for the intermediate contact 3 while realizing wiring. Specifically, when the three-position disconnector is a direct-acting type, the intermediate contact 3 of the three-position disconnector is preferably as described in the first embodiment, and the intermediate contact 3 includes a three-way intermediate contact seat 302, the lower part of the three-way intermediate contact seat 302 is connected to the upper part, and the two side edges of the lower part protrude outward to form two relatively spaced connecting flanges 303 for connecting to the first terminal 74. A connecting hole is provided on the connecting flange 303 and a bolt is installed in the connecting hole. The connecting portion of the first terminal 74 extends between the two connecting flanges 303, and the bolt hole is aligned with the connecting hole. Correspondingly, under the cooperation of the connecting flange 303 and the bolt, the first terminal 74 and the three-way intermediate contact seat 302 form a plug-in structure; when the three-position disconnector is a knife-type three-position disconnector, the intermediate contact 3 of the three-position disconnector is preferably as described in the second embodiment, the intermediate contact seat 302 includes a second moving contact 311, and the second moving contact 311 is connected by two oppositely arranged disc springs, and a gap is left between the two disc springs, so that the first terminal 74 can extend into the gap between the connecting ends 311a and form a plug-in structure through the bolt (see the plug-in structure for details). Figure 3-6 , 9-12).

[0051] like Figure 17-18 As shown, the insulating housing 71 is provided with a mounting hole 711 for connecting to the sealing mounting plate 8. The mounting hole 711 is a through hole. The sealing mounting plate 8 is provided with a fixing hole 81 corresponding to the mounting hole 711. The fixing hole 81 is an internal threaded hole that does not pass through both sides of the sealing mounting plate 8 to prevent leakage points from being generated when the insulating housing 71 is connected to the sealing mounting plate 8. Figure 18 In the embodiment, each insulating housing 71 corresponds to four fixing holes 81. Figure 17As shown, a bellows 79 is preferably provided inside the supporting end of the insulating shell 71, and the insulating shell 71 is sealed with the sealing mounting plate 8 through the bellows 79. The bellows 79 is arranged inside the supporting end of the insulating shell 71, and the bellows 79 has its own sealing ring mounting groove. The bellows 79 and the sealing mounting plate 8 are sealed by an O-ring.

[0052] Combine Figure 6-7 13-18 introduce an embodiment of a sealed pole 7, which includes an insulating shell 71. The insulating shell 71 is a hollow cylinder with one end closed and the other end open. A second threading hole is provided on the end face of the closed end, and the open end is supported and fixed on the sealing mounting plate 8 as a supporting end. A rectangular first threading hole is provided in the middle of the outer wall of the hollow cylinder, and an annular protrusion 78 is provided around the outer periphery of the first threading hole. A circular supporting boss 77 is protruded from the outer wall of the closed end of the hollow cylinder. The first threading hole coincides with the central axis of the supporting boss 77, and the protruding height of the annular protrusion 78 is equal to that of the supporting boss 77. The end of the connecting plate extending out of the first threading hole serves as a connecting portion, and the connecting portion protrudes from the annular protrusion 78. The annular protrusion 78 and the connecting portion are together with The lower part of the three-way intermediate contact seat 302 is plugged in and matched; two opposite through holes 76 are provided on the side wall of the insulating shell 71 between the support end and the first threading hole, and the central axis of one of the through holes 76 coincides with the central axis of the first threading hole. Preferably, the side wall close to the support end protrudes outward so that the side wall of the sealed pole 7 is a step surface with one end higher and the other end lower, thereby forming two parts with different inner diameters inside the insulating shell 71, wherein the conductive component chamber 72 corresponds to the higher end, that is, the conductive component chamber 72 corresponds to the part with a larger inner diameter, and the vacuum arc extinguishing chamber 73 corresponds to the lower end, that is, the vacuum arc extinguishing chamber 73 corresponds to the part with a smaller inner diameter, and the first threading hole corresponds to the junction of the higher end and the lower end, that is, the first threading hole is correspondingly arranged at the junction of the conductive component chamber 72 and the vacuum arc extinguishing chamber 73. Preferably as Figure 7 、 13-15, the supporting end of the insulating shell 71 protrudes radially outward to form a convex edge, and a mounting hole 711 for connecting with the sealing mounting plate 8 is provided on the convex edge. The mounting hole 711 is a through hole, and a fixing hole 81 corresponding to the mounting hole 711 is provided on one side of the sealing mounting plate 8. The fixing hole 81 is an internal threaded hole that does not pass through both sides of the sealing mounting plate 8. Compared with the existing structure in which the fixing hole 81 is a through hole and the mounting hole 711 is an internal threaded hole, this mating connection structure reduces the leakage points of the sealing mounting plate 8. Preferably, the support end is provided with a bellows 79, and the insulating shell 71 is sealedly connected to the sealing mounting plate 8 through the bellows 79. The bellows 79 passes through the sealing mounting plate 8 to further increase the support stability of the insulating shell 71 and the sealing mounting plate 8. A sealing ring mounting groove is provided on the side where the bellows 79 passes through the sealing mounting plate 8. The opening of the sealing ring mounting groove faces the sealing mounting plate 8, and is sealed by installing an O-ring in the sealing mounting groove. The fixing hole 81 used to fix the bellows 79 is also an internal threaded hole to prevent leakage points from being generated on the sealing mounting plate 8.

[0053] In the present application, the cavity size of the vacuum interrupter 73 is preferably controlled by changing the epoxy resin casting thickness. Without changing the outer diameter of the insulating shell 71, the cavity size of the insulating shell 71 is determined by adjusting the thickness of the cast epoxy resin or the thickness of the encapsulation of the vacuum interrupter 73. This method is applicable to 12kV and 24kV voltage levels, 630A to 1600A current levels, and can accommodate different models of vacuum interrupters 73. This breaks the limitation that the cavity of the insulating shell 71 designed in the traditional solution can only be applicable to one or several vacuum interrupters 73 of the same voltage level. In engineering applications, the present invention only needs to replace the vacuum interrupter 73 and the flexible connector 741, and can be applied to inflatable cabinets with 12kV and 24kV voltage levels and 630A to 1600A current levels, and can meet the requirements of electrical insulation distance and dielectric strength.

[0054] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A combination of a three-position disconnector and a circuit breaker suitable for use in a gas cabinet, wherein the three-position disconnector and the circuit breaker are arranged on a sealed mounting plate (8) in the gas cabinet, and a sealed pole (7) of the circuit breaker and a switch device of the three-position disconnector are mounted on the same side of the sealed mounting plate (8), characterized in that: The sealed pole (7) is located below the switch device and provides a support and installation site for the switch device; the switch device includes a transmission screw (5) and a grounding contact seat (2), an intermediate contact (3), and a static contact seat (4) arranged in sequence, the transmission screw (5) and the sealed pole (7) are arranged in the same direction and parallel, the grounding contact seat (2) is installed on the sealing installation plate (8), the intermediate contact (3) and the static contact seat (4) are supported by the sealed pole (7), the intermediate contact (3) is a first intermediate contact or a second intermediate contact, and a first terminal (74) capable of fixedly installing the first intermediate contact and rotatably installing the second intermediate contact is provided on one side of the middle part of the sealed pole (7). The first intermediate contact comprises a first moving contact (301) sleeved on the transmission screw (5) and a three-way intermediate contact seat (302); the lower portion of the three-way intermediate contact seat (302) is connected to the first terminal (74) of the sealed pole (7); the upper portion of the three-way intermediate contact seat (302) is sleeved on the transmission screw (5); when the transmission screw (5) rotates, the transmission screw (5) causes the first moving contact (301) to perform linear motion between the two ends of the transmission screw (5) for cooperating with the grounding contact seat (2) or the static contact seat (4); the first moving contact (301) can slide through the upper portion of the three-way intermediate contact seat (302) when performing linear motion on the transmission screw (5); The second intermediate contact comprises a second moving contact (311) and a driving member (312), wherein the second moving contact (311) has a connecting end (311a) and a free end (311b), wherein the connecting end (311a) is rotatably connected to the first terminal (74) of the sealed pole (7), and the free end (311b) is used to cooperate with the grounding contact seat (2) or the static contact seat (4), and a guide groove (313) for cooperating with the driving member (312) is provided on the second moving contact (311), and the driving member (312) is mounted on the transmission screw (5). Under the drive of the transmission screw (5), the driving member (312) performs a linear motion between the two ends of the transmission screw (5), and at the same time, the driving member (312) cooperates with the two side edges of the guide groove (313) to make the second moving contact (311) swing at the two ends of the transmission screw (5), so as to cooperate with the grounding contact seat (2) or the static contact seat (4).

2. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The first terminal (74) includes a connecting plate (742) with one end extending out of the insulating housing (71) for connecting to the intermediate contact (3) of the switch device, and the end of the connecting plate (742) extending out of the insulating housing (71) serves as a connecting portion, and a bolt hole is provided through the connecting portion. The connecting portion is arranged along the axial direction of the sealed pole (7), and the central axis of the bolt hole is perpendicular to the axial direction of the sealed pole (7).

3. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The two side edges of the lower portion of the intermediate contact seat (302) protrude outward to form two relatively spaced connection ridges (303) for connecting to the first terminal (74), and a connection hole is provided on the connection ridges (303).

4. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The second moving contact (311) includes two disc springs arranged opposite to each other, one end of the two disc springs serving as a connecting end (311a) and being rotatably connected to the first terminal (74) of the sealed pole (7), the ends of the two disc springs at the connecting end (311a) being provided with disc spring connecting holes, and a gap for the first terminal (74) to extend therethrough being left between the ends of the two disc springs, the other ends of the two disc springs being connected together as the free end (311b) of the second moving contact (311), a gap for the transmission screw (5) to pass through being left between the two disc springs, and a guide groove (313) being provided in the middle of each disc spring.

5. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The driving member (312) is a linear thread sleeve sleeved on the transmission screw (5); the inner side wall of the driving member (312) is provided with a thread matched with the outer side wall of the transmission screw (5); when the transmission screw (5) rotates, the driving member (312) can make a linear motion on the transmission screw (5); the side wall of the driving member (312) and the two sides of the guide groove (313) are limited and matched to make the second moving contact (311) swing between the two ends of the transmission screw (5); after the second moving contact (311) swings toward one end of the transmission screw (5), the driving member (312) makes a linear motion on the transmission screw (5) and the side wall of the driving member (312) and the guide groove (313) are slidably matched.

6. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The contact position of the grounding contact seat (2) is located above the connection between the transmission screw (5) and the sealing mounting plate (8), and the static contact (43) on the static contact seat (4) is located above the connection between the static contact seat (4) and the transmission screw (5), and the static contact (43) corresponds to the contact position of the grounding contact seat (2).

7. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 2, characterized in that: A first threading hole is provided on an outer wall of one side of the insulating housing (71), and the first terminal (74) extends out of the insulating housing (71) through the first threading hole for connection with the intermediate contact (3) in the switch device. An annular protrusion (78) is provided around the outer periphery of the first threading hole. The connecting plate (742) is a rectangular connecting plate (742), one end of which is provided with a notch (742a) that can be engaged with one side of the first threading hole, and the end extending out of the first threading hole serves as a connecting portion, and the connecting portion protrudes from the annular protrusion (78).

8. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: One end of the sealed pole (7) is connected to the sealing mounting plate (8) as a supporting end, the other end of the sealed pole (7) is a second terminal (75), and a supporting boss (77) is provided on a side of the second terminal (75) close to the switch device, a first terminal (74) is provided in the middle of the sealed pole (7), and the static contact seat (4) is arranged on the supporting boss (77).

9. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The intermediate contact (3) is connected to the first terminal (74) of the sealed pole (7) via bolts, and a voltage balancing structure for improving electric field distribution is provided at the connection point of the bolts.

10. The combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet according to claim 1, characterized in that: The three-position disconnector further comprises a first operating mechanism (1) for driving a transmission screw (5) to rotate, and the circuit breaker further comprises a second operating mechanism (6) connected to the sealed pole (7), and the first operating mechanism (1) and the second operating mechanism (6) are mounted on the other side of the sealed mounting plate (8).

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