CN111627782A - Combination of three-station disconnecting switch and circuit breaker suitable for inflating cabinet - Google Patents
Combination of three-station disconnecting switch and circuit breaker suitable for inflating cabinet Download PDFInfo
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- CN111627782A CN111627782A CN202010590103.3A CN202010590103A CN111627782A CN 111627782 A CN111627782 A CN 111627782A CN 202010590103 A CN202010590103 A CN 202010590103A CN 111627782 A CN111627782 A CN 111627782A
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- contact
- drive screw
- circuit breaker
- driving
- isolating switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H89/00—Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
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- Electromagnetism (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
一种适用于充气柜的三工位隔离开关与断路器的组合，在充气柜的密封安装板的同一侧安装有断路器的固封极柱和三工位隔离开关的开关装置，固封极柱位于开关装置的下方并为开关装置提供支撑安装位点；开关装置包括传动丝杠以及沿传动丝杠轴向方向依次设置的接地触头座、中间触头、静触头座，所述传动丝杠与固封极柱同向平行设置，接地触头座安装于密封安装板，中间触头与静触头座由固封极柱支撑，所述中间触头包括用于与接地触头座或静触头座配合的动触头，所述动触头在传动丝杠的驱动下可在传动丝杠的两端之间做直线运动或在传动丝杠的两端之间摆动。本组合可以使刀闸式、直动式三工位隔离开关共同设置在同一充气柜中，降低了对充气柜的设计要求。
A combination of a three-position isolating switch and a circuit breaker suitable for an inflatable cabinet, a solid-sealing pole of the circuit breaker and a switch device of the three-position isolating switch are installed on the same side of a sealing mounting plate of the inflatable cabinet, and the solid-sealing pole is installed. The column is located below the switch device and provides a support and installation site for the switch device; the switch device includes a drive screw and a ground contact seat, an intermediate contact, and a static contact seat arranged in sequence along the axial direction of the drive screw. The lead screw and the solid-sealed pole are arranged in parallel in the same direction, the grounding contact seat is installed on the sealing mounting plate, the intermediate contact and the static contact seat are supported by the solid-sealing pole, and the middle contact includes a ground contact seat for connecting with the grounding contact seat. Or a moving contact matched with a static contact seat, the moving contact can perform linear motion between the two ends of the drive screw or swing between the two ends of the drive screw under the drive of the drive screw. The combination can make the knife gate type and the direct-acting three-position isolating switch co-located in the same inflatable cabinet, which reduces the design requirements for the inflatable cabinet.
Description
Technical Field
The invention relates to the field of medium-voltage circuit breakers, in particular to a combination of a three-station isolating switch and a circuit breaker, which is suitable for an inflating cabinet.
Background
At present, three-position isolating switches arranged in an inflatable cabinet are divided into a direct-acting type and a disconnecting link type, wherein the direct-acting type three-position isolating switches are small in size, uniform in electric field distribution and high in cost, and the disconnecting link type three-position isolating switches are low in cost, good in radiating effect and nonuniform in electric field distribution. Because the two three-position isolating switches have different transmission modes, the operating mechanism is not uniform and has different movement tracks, when the three-position isolating switch is of a direct-acting type, the solid-sealed polar pole of the circuit breaker and the three-position isolating switch are kept in parallel, the movement track of the moving contact of the three-position isolating switch is a straight line, and when the three-position isolating switch is of a knife switch type, the solid-sealed polar pole of the circuit breaker and the three-position isolating switch need to be kept in vertical arrangement, because the movement track of the moving contact of the three-position isolating switch is an arc line, and the space occupied in the cabinet body by the mutually vertical combination mode is larger, in addition, the combination of the two three-position isolating switches and the circuit breaker is difficult to form a uniform combination mode in the inflatable cabinet, and the combination mode of the two three-position isolating switches and the circuit breaker is difficult to share, therefore, but also is not beneficial to the flexible use of two three-position isolating switches.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a combination of a three-position disconnecting switch and a circuit breaker, which has a simple structure and high reliability and is suitable for an inflatable cabinet.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-position isolating switch and a breaker are combined, the three-position isolating switch and the breaker are arranged on a sealing mounting plate in an inflatable cabinet, a solid-sealed polar pole of the breaker and a switching device of the three-position isolating switch are arranged on the same side of the sealing mounting plate, and the solid-sealed polar pole is positioned below the switching device and provides a supporting mounting site for the switching device; the switching device comprises a transmission lead screw, and a grounding contact seat, an intermediate contact and a static contact seat which are sequentially arranged, wherein the transmission lead screw and a solid-sealed pole are arranged in parallel in the same direction, the grounding contact seat is arranged on a sealing mounting plate, the intermediate contact and the static contact seat are supported by the solid-sealed pole, a first wiring end which can fixedly mount the intermediate contact and can rotatably mount the intermediate contact is arranged on one side of the middle part of the solid-sealed pole, the intermediate contact comprises a moving contact which is used for being matched with the grounding contact seat or the static contact seat, the intermediate contact is fixedly connected with the first wiring end, the moving contact moves linearly between two ends of the transmission lead screw under the driving of the transmission lead screw, or the intermediate contact is rotatably connected with the first wiring end, and the moving contact swings between two ends of the.
Further, first wiring end includes that one end stretches out the outer connecting plate that is used for being connected with switching device's middle contact of insulating casing, and the outer one end of connecting plate stretching out insulating casing is as connecting portion, be equipped with the bolt hole that runs through on the connecting portion, connecting portion set up along the axial of solid utmost point post, the central axis of bolt hole is mutually perpendicular with the axial of solid utmost point post of sealing.
Furthermore, the middle contact comprises a first moving contact sleeved on the transmission screw rod, and when the transmission screw rod rotates, the transmission screw rod enables the first moving contact to do linear motion between two ends of the transmission screw rod.
Furthermore, the middle contact also comprises a tee middle contact seat, the lower part of the tee middle contact seat is connected to the first wiring end of the solid-sealed polar pole, the upper part of the tee middle contact seat is sleeved on the transmission screw rod, and the first moving contact can slidably penetrate through the upper part of the tee middle contact seat when linearly moving on the transmission screw rod.
Furthermore, two side edges of the lower part of the middle contact seat protrude outwards to form two connecting convex edges which are arranged at opposite intervals and used for being connected with the first wiring end, and the connecting convex edges are provided with connecting holes.
Furthermore, the middle contact comprises a second moving contact and a driving piece, the second moving contact is provided with a connecting end and a free end, the connecting end is rotatably connected with the first wiring end of the solid-sealed pole, the free end is used for being matched with the grounding contact seat or the static contact seat, the second moving contact is provided with a guide groove used for being matched with the driving piece, the driving piece is installed on the transmission screw rod, under the driving of the transmission screw rod, the driving piece does linear motion between the two ends of the transmission screw rod, and meanwhile, the driving piece enables the second moving contact to swing at the two ends of the transmission screw rod through being matched with the edges of the two sides of the guide groove and is used for being matched with the grounding contact seat.
Further, the second moving contact includes the dish spring of two relative settings, the one end of two dish springs rotates as the link and seals the first wiring end of utmost point post admittedly and is connected, the tip of two dish springs of link is equipped with dish spring connecting hole, and leaves the space that supplies first wiring end to stretch into between the tip of two dish springs, the other end of two dish springs links together as the free end of second moving contact, leave the space that supplies drive screw to pass between two dish springs, be equipped with the guide way at the middle part of every dish spring.
Furthermore, the driving piece is a direct-acting threaded sleeve sleeved on the transmission screw rod, threads matched with the outer side wall of the transmission screw rod are arranged on the inner side wall of the driving piece, and the driving piece can do linear motion on the transmission screw rod when the transmission screw rod rotates; the side wall of the driving piece is in spacing fit with the two sides of the guide groove and is used for enabling the second moving contact to swing between the two ends of the transmission screw rod, after the second moving contact swings towards one end of the transmission screw rod, the driving piece makes linear motion on the transmission screw rod, and the side wall of the driving piece is in sliding fit with the guide groove.
Furthermore, the contact position of the grounding contact seat is positioned above the connection part of the transmission screw rod and the sealing installation plate, the static contact on the static contact seat is positioned above the connection part of the static contact seat and the transmission screw rod, and the static contact corresponds to the contact position of the grounding contact seat.
Further, be equipped with first through wires hole at one side outer wall of insulating casing, first wiring end stretches out insulating casing through first through wires hole and is arranged in being connected with the middle contact among the switching device first fenestrate peripheral encircleing is provided with annular bulge, the connecting plate is the connecting plate of rectangle, and one end is equipped with the breach that can block with one side looks of first through wires hole, stretches out the outer one end of first through wires hole as connecting portion, connecting portion protrusion is protruding in annular bulge.
Furthermore, one end of the solid-sealed polar pole is used as a supporting end to be connected with the sealing mounting plate, the other end of the solid-sealed polar pole is a second wiring end, a supporting boss is arranged on one side, close to the switch device, of the second wiring end, a first wiring end is arranged in the middle of the solid-sealed polar pole, and the static contact base is arranged on the supporting boss.
Furthermore, the middle contact is connected with the first wiring end of the solid-sealed polar pole through a bolt, and a pressure equalizing structure for improving electric field distribution is arranged at the connection position of the bolt.
Furthermore, the three-station isolating switch further comprises a first operating mechanism used for driving the transmission lead screw to rotate, the circuit breaker further comprises a second operating mechanism connected with the solid-sealed pole, and the first operating mechanism and the second operating mechanism are mounted on the other side of the sealed mounting plate.
The invention relates to a combination of a three-position isolating switch and a circuit breaker, which is suitable for an inflatable cabinet, wherein an embedded pole is arranged in parallel with a transmission screw rod of a switching device in the same direction, the embedded pole can be fixedly provided with a middle contact and can be rotatably provided with the middle contact, a movable contact can do linear motion between two ends of the transmission screw rod under the drive of the transmission screw rod, or the middle contact is rotatably connected with a first terminal, the movable contact swings between two ends of the transmission screw rod, the motion trail of the movable contact is uniformly arranged on the plane where the transmission screw rod is located, the linear motion trail of the movable contact corresponds to the motion trail of the movable contact of a direct-acting three-position isolating switch, the swing of the movable contact corresponds to the motion trail of the movable contact of a knife-switch type three-position isolating switch, and can simultaneously meet the space requirements of different three-position isolating switches The direct-acting three-position isolating switch is arranged in the inflatable cabinet together, the design requirement on the inflatable cabinet is reduced, and the direct-acting three-position isolating switch and the disconnecting link three-position isolating switch can be flexibly replaced and can be widely applied.
In addition, the first wiring end and the middle contact of the switch device form a plug-in structure, so that the connection stability of the switch device and the solid-sealed pole column is enhanced; in addition, a voltage-sharing structure for improving electric field distribution is arranged at the joint of the first wiring end and the middle contact, so that the problem of uneven electric field distribution is prevented.
Drawings
FIGS. 1-5 are schematic structural diagrams of a three-position disconnecting switch and circuit breaker combination suitable for an inflatable cabinet (direct-acting three-position disconnecting switch) according to the present invention;
FIG. 6 is an enlarged view of portion B of FIG. 5;
FIG. 7 is an enlarged view of section C of FIG. 5;
FIG. 8 is a schematic structural diagram of a three-way middle contact block in a combination of a three-position disconnecting switch and a circuit breaker suitable for an inflatable cabinet according to the present invention;
FIGS. 9-12 are schematic structural views of a three-position disconnector and circuit breaker combination suitable for use in gas-filled cabinets of the present invention (knife-switch three-position disconnector);
FIGS. 13-15 are schematic structural views of a sealed pole in a combination of a three-position disconnecting switch and a circuit breaker for an inflatable cabinet according to the present invention;
FIGS. 16-17 are schematic structural views of a seal post and a seal mounting plate in a three-position disconnector and circuit breaker combination suitable for use in an inflatable cabinet according to the present invention;
fig. 18 is a schematic structural diagram of a sealing mounting plate in a combination of a three-position disconnecting switch and a circuit breaker suitable for an air-filled cabinet.
Detailed Description
The following description will further describe a specific embodiment of a combination of a three-position disconnecting switch and a circuit breaker suitable for an air-filled cabinet according to the present invention with reference to the embodiments shown in fig. 1 to 18. A three-position disconnector and circuit breaker combination suitable for gas-filled cabinets of the invention is not limited to the description of the following embodiments.
A three-position isolating switch and a breaker are combined and suitable for an inflatable cabinet, the three-position isolating switch and the breaker are arranged on a sealing mounting plate 8 in the inflatable cabinet, the three-position isolating switch comprises a first operating mechanism 1 and a switch device connected with the first operating mechanism 1, and the breaker comprises a second operating mechanism 6 and an embedded pole 7 connected with the second operating mechanism 6; the switching device and the solid-sealed polar pole 7 are arranged on one side of the sealed mounting plate 8, and the first operating mechanism 1 and the second operating mechanism 6 are arranged on the other side of the sealed mounting plate 8; the embedded pole 7 is located below the switching device and provides a supporting mounting site for the switching device.
The switch device comprises a transmission screw rod 5, and a grounding contact seat 2, an intermediate contact 3 and a static contact seat 4 which are sequentially arranged along the axial direction of the transmission screw rod 5, wherein the transmission screw rod 5 and a solid-sealed pole 7 are arranged in parallel in the same direction, the transmission screw rod 5 is positioned above the solid-sealed pole 7, the transmission screw rod 5 is driven by a first operating mechanism 1 to rotate, the grounding contact seat 2 is installed on a sealing installation plate 8, the intermediate contact 3 and the static contact seat 4 are supported by the solid-sealed pole 7, a first wiring end 74 and a second wiring end 75 are arranged on the solid-sealed pole 7, the first wiring end 74 is connected with the intermediate contact 3, preferably, the first wiring end 74 is in plug-in fit with the intermediate contact 3, and the second wiring end 75 is connected with a busbar in an. The middle contact 3 comprises a moving contact matched with the grounding contact seat 2 or the fixed contact seat 4, and when the middle contact 3 is fixedly connected with the first wiring terminal 74, the moving contact can do linear motion between two ends of the transmission screw rod 5 under the driving of the transmission screw rod 5, or when the middle contact 3 is rotatably connected with the first wiring terminal 74, the moving contact swings between two ends of the transmission screw rod 5.
Preferably, the transmission screw 5 penetrates through the sealing mounting plate 8 and is supported on the static contact base 4, the grounding contact base 2 and the static contact base 4 are oppositely arranged along the axial direction of the transmission screw 5, the static contact base 4 is preferably an L-shaped static contact base 4, the L-shaped static contact base 4 comprises a short arm 41 and a long arm 42, the short arm 41 is supported on a supporting boss 77, two ends of the transmission screw 5 are supported on the long arm 42 and the sealing mounting plate 8, and a static contact 43 used for being matched with a moving contact is arranged on one side of the long arm 42 facing the sealing mounting plate 8 in a protruding mode.
In the combination, the linear motion track of the moving contact and the motion of the moving contact in the direct-acting three-position isolating switch are both driven by the transmission lead screw 5, so that the first embodiment suitable for the direct-acting three-position isolating switch is provided.
The combination mode of the three-position disconnecting switch and the circuit breaker with the moving contact moving linearly on the transmission screw 5 is described in detail with reference to fig. 1-8, and the switching device comprises the transmission screw 5, and a grounding contact base 2, an intermediate contact 3 and a static contact base 4 which are sequentially arranged along the axial direction of the transmission screw 5.
As shown in fig. 1-2, the grounding contact block 2 is disposed on the sealing mounting plate 8, the driving screw 5 penetrates through the middle portion of the grounding contact block 2, the contact position of the grounding contact block 2 surrounds the connection portion between the driving screw 5 and the grounding contact block 2, the stationary contact block 4 includes an L-shaped structure, the L-shaped structure includes a short arm 41 and a long arm 42, the short arm 41 is supported on a supporting boss 77 of the stationary-sealed pole 7, two ends of the driving screw 5 are supported on the long arm 42 and the sealing mounting plate 8, a stationary contact 43 for being engaged with the first movable contact 301 is disposed on one side of the long arm 42 facing the sealing mounting plate 8, and the stationary contact 43 is located at the connection portion with the driving screw 5 and surrounds the periphery of the connection portion.
As shown in fig. 1 to 5, the middle contact 3 includes a first moving contact 301 and a three-way middle contact base 302 sleeved on the transmission screw 5, a lower portion of the three-way middle contact base 302 is connected to a middle portion of the embedded pole 7, an upper portion of the three-way middle contact base 302 is sleeved on the transmission screw 5, the first moving contact 301 can slidably penetrate through the upper portion of the three-way middle contact base 302 when the transmission screw 5 makes a linear motion, and two ends of the first moving contact 301 can be respectively matched with the grounding contact base 2 and the static contact base 4.
As shown in fig. 4, the first moving contact 301 is a conductive slider slidably engaged with the three-way middle contact base 302, a through hole for the transmission screw 5 to pass through is formed in the middle of the first moving contact 301, a thread engaged with the outer sidewall of the transmission screw 5 is formed on the inner sidewall of the through hole, and when the transmission screw 5 rotates, the transmission screw 5 makes the first moving contact 301 perform linear motion between the two ends of the transmission screw 5 for engaging with the grounding contact base 2 and the static contact base 4, respectively. When the transmission screw 5 is driven by the first operating mechanism 1 to rotate in the forward direction, the first movable contact 301 rotates to the end, away from the sealing mounting plate 8, of the transmission screw 5 and is matched with the static contact base 4; when the driving screw 5 is driven by the first operating mechanism 1 to move in a reverse direction, the first movable contact 301 rotates to one end close to the sealing mounting plate 8 to be matched with the grounding contact block 2.
As shown in fig. 4-8, the upper portion of the three-way middle contact base 302 is provided with a sliding cavity for slidably engaging with the first moving contact 301, as shown in fig. 8, the upper portion of the three-way middle contact base 302 is hollow cylindrical, a cavity provided at the upper portion serves as the sliding cavity for the first moving contact 301 to slidably engage, two ends of the first moving contact 301 can extend out of the sliding cavity under the driving of the driving screw 5 to be externally used for engaging with the grounding contact base 2 or the static contact base 4, and when one end of the first moving contact 301 engages with the grounding contact base 2 or the static contact base 4, the other end of the first moving contact 301 is still located in the sliding cavity. An electrically conductive contact finger is arranged at one end of the tee joint middle contact base 302 close to the static contact base 4, the electrically conductive contact finger is matched with one end of the first moving contact 301 far away from the static contact base 4, and the first moving contact 301 is kept electrified when being matched with the static contact base 4. Contact seat 302 becomes cylindrically in the middle of the tee bend, and one end is connected with the upper portion middle part, makes the whole T type structure that becomes of contact seat 302 in the middle of the tee bend, moves the outside outstanding formation two relative connection chimbs 303 in one end both sides edge of contact seat 302 lower part in the middle of the tee bend, in figure 8, two connection chimbs 303 are the rectangle connect chimb 303 be equipped with the connecting hole and install the bolt in the connecting hole, it is used for being connected with solid utmost point post 7 to leave the clearance between two connection chimbs 303, preferably seal the first wiring end 74 of utmost point post 7 admittedly and can insert two and connect the clearance between the chimb 303, under the common cooperation of connecting chimb 303 and bolt, make first wiring end 74 and tee bend middle contact seat 302 form grafting structure. Further, a pressure equalizing structure for improving electric field distribution is arranged at the bolt mounting position, and preferably, the connecting hole is a countersunk hole for optimizing electric field distribution.
In the present combination, the motion trajectory of the moving contact swinging between the two ends of the driving screw 5 is the same as the motion trajectory of the moving contact in the disconnecting link type three-position disconnecting switch, thus providing a second embodiment applicable to the disconnecting link type three-position disconnecting switch.
The combination of a three-position disconnecting switch and a circuit breaker with a movable contact swinging between two ends of a transmission screw 5 is described in detail with reference to fig. 9-12, the switching device comprises the transmission screw 5, and a grounding contact seat 2, a middle contact 3 and a static contact seat 4 which are sequentially arranged along the axial direction of the transmission screw 5,
as shown in fig. 9 and 10, the grounding contact block 2 is arranged on the sealing mounting plate 8, the contact point position of the grounding contact block 2 is located at one side of the driving screw 5, and corresponding to the contact position of the static contact, the static contact holder 4 comprises an L-shaped structure, the L-shaped structure comprises a short arm 41 and a long arm 42, the short arm 41 is supported on the supporting boss 77, the two ends of the drive screw 5 are supported on the long arm 42 and the sealing mounting plate 8, a static contact 43 used for being matched with the first movable contact 301 is arranged on one side of the long arm 42 facing the sealing installation plate 8, the static contact 43 is positioned on one side of the connection part of the long arm 42 and the transmission screw rod 5, in fig. 10, the contact position of the grounding contact block 2 is located above the connection position of the transmission screw 5 and the seal mounting plate 8, the stationary contact 43 is located above the connection position of the long arm 42 and the transmission screw 5, and the stationary contact 43 corresponds to the contact position of the grounding contact block 2.
As shown in fig. 11 to 12, the intermediate contact 3 includes a second movable contact 311 and a driving element 312, the second movable contact 311 is rotatably installed on the first terminal 74 of the embedded pole 7, the second movable contact 311 is provided with a guide slot 313 for being engaged with the driving element 312, the driving element 312 is installed on the transmission lead screw 5, under the driving of the transmission lead screw 5, the driving element 312 makes a linear motion between two ends of the transmission lead screw 5, and meanwhile, the driving element 312 makes the second movable contact 311 swing at two ends of the transmission lead screw 5 by being engaged with two side edges of the guide slot 313 for being engaged with the grounding contact block 2 or the static contact block 4.
As shown in fig. 10, the second movable contact 311 has a connection end 311a and a free end 311b, the connection end 311a is rotatably connected to the first terminal 74 of the embedded pole 7, the free end 311b is used for being matched with the grounding contact holder 2 or the fixed contact holder 4, a guiding slot 313 in the shape of a long circular hole is disposed between the connection end 311a and the free end 311b, the driving member 312 is mounted on the transmission screw 7, two ends of the driving member 312 are provided with protruding structures extending into the guiding slot 313 for sliding fit, the protruding structures of the driving member 312 slide in the guiding slot 313, and the protruding structures are matched with two side edges of the guiding slot 313 so that the driving member 312 can drive the free end 311b of the second movable contact 311 to swing at two ends of the transmission screw 5 when making a linear motion. Preferably, one end of the guide groove 313 is used as a limiting end 313a (see fig. 11), the limiting end 313a is located at one end close to the connecting end 311a, and when the second movable contact 311 rotates to be perpendicular to the driving screw 5, the limiting end 313a is matched with the protruding structure of the driving element 312.
With reference to fig. 9-12, a structure of the second moving contact 311 is provided, where the second moving contact 311 includes two disc springs disposed opposite to each other, one end of each of the two disc springs is used as a connection end 311a to be rotatably connected to the embedded pole 7, preferably, a disc spring connection hole is disposed at an end of each of the two disc springs forming the connection end 311a, a gap for the first connection end 74 to extend into is left between the ends of the two disc springs, the first connection end 74 extends into the gap to form a rotatable plug-in structure with the connection end 311a of the second moving contact 311, and a bolt passes through the disc spring connection hole and the bolt hole to be installed, so that connection stability between the second moving contact 311 and the first connection end 74 is enhanced. The connecting end 311a of the second movable contact 311 is preferably connected to the first terminal 74 by a bolt, and a voltage equalizing structure for improving electric field distribution is provided at the bolt connection, and in this embodiment, a voltage equalizing ring is preferably provided at the bolt installation position. The other ends of the two disc springs are connected together to form a free end 311b of the second movable contact 311, a gap for the transmission lead screw 5 to pass through is reserved between the two disc springs, a long circular hole-shaped guide groove 313 is arranged in the middle of each disc spring, and preferably, one end of the guide groove 313, which is close to the connecting end 311a, is used as a limiting end 313 a.
It should be noted that, after the driving element 312 drives the second moving contact 311 to rotate, the displacement length of the driving element 312 continuously doing linear motion along the driving screw 5 has a certain influence on the matching between the second moving contact 311 and the grounding contact base 2 and the static contact base 4, and as the displacement length of the driving element 312 continuously doing linear motion is prolonged, the driving element 312 continuously matches with the guiding slot 313, so that the free end 311b of the second moving contact 311 is further turned to the grounding contact base 2 or the static contact base 4, which is favorable for enhancing the matching stability of the free end 311b, because the movement range of the driving element 312 is usually between the grounding contact base 2 and the static contact base 4, that is, the stroke of the driving element 312 is smaller than the distance between the grounding contact base 2 and the static contact base 4, the guiding slot 313 may be a hole with two closed ends, or an open slot with one closed end and located on the side of the guiding slot 313 close to, preferably, a limit end 313a is provided in the guide slot 313, the limit slot 313a is located on one side of the guide slot 313 close to the connection end 311a, and the closed limit end 313a is engaged with the driving element 312 when the second movable contact 311 rotates to a position perpendicular to the driving screw 5. Of course, the guide groove 313 may be a strip-shaped groove with two open ends, and the limiting end 313a is not provided at this time; the shape of the second moving contact 311 is not limited to a disc spring, and may also be a rod or other structure capable of swinging, and certainly, the second moving contact 311 may also be formed by only a single disc spring, but the connection structure of the single disc spring and the first terminal 74 is not an insertion structure, and the single disc spring, the driving member 312 and the transmission screw 5 are poor in matching stability, and easily incline to one side, which results in poor matching with the grounding contact base 2 or the static contact base 4.
The driving part 312 is a linear-motion threaded sleeve sleeved on the transmission screw 5, the inner side wall of the driving part 312 is provided with threads matched with the outer side wall of the transmission screw 5, and when the transmission screw 5 rotates, the driving part 312 can make linear motion on the transmission screw 5; the side wall of the driving element 312 is in spacing fit with two sides of the guide groove 313 to enable the second moving contact 311 to swing between two ends of the transmission screw 5, preferably, two side walls of the driving element 312 are respectively provided with a circular protruding structure for being matched with the spacing groove 313, after the second moving contact 311 swings towards one end of the transmission screw 5, the driving element 312 makes a linear motion on the transmission screw 5, and the side wall of the driving element 312 is in sliding fit with the guide groove 313. As shown in fig. 9 to 12, the second movable contact 311 is perpendicular to the transmission screw 5 in the initial state, so that the guide slot 313 of the second movable contact 311 is also perpendicular to the transmission screw 5, and the driving element 312 is located at the position-limiting end 313a of the guide slot 313. When the driving screw 5 is driven by the first operating mechanism 1 to rotate in the forward direction, the driving member 312 generates a tendency of linear motion toward the direction approaching the stationary contact base 4 under the action of the driving screw 5, meanwhile, the circular protrusion structures on the side wall of the driving member 312 are in limit fit with the two side edges of the guide groove 313, the movement tendency of the driving member 312 causes the second movable contact 311 to rotate and causes the free end 311b of the second movable contact 311 to turn toward the stationary contact base 4, along with the continuous rotation of the driving screw 5, the guide groove 313 gradually inclines toward the direction approaching the stationary contact base 4 from the previous direction perpendicular to the driving screw 5, the driving member 312 continues to perform linear motion toward the stationary contact base 4 on the driving screw 5, and meanwhile, the driving member 312 also slides toward the direction far from the limit end 313a along the guide groove 313, and when the second movable contact 311 does not need to be matched with the stationary contact base 4, the driving screw 5 rotates reversely, the driving piece 312 slides along the direction that the guide groove 313 is close to the limit end 313a and makes a linear motion on the driving screw 5 away from the stationary contact base 4, when the driving piece 312 slides to the limit end 313a of the guide groove 313, the driving piece 312 is in limit fit with two sides of the limit groove 313 to enable the second movable contact 311 to rotate and return to an initial state, and at the moment, a circular limit protruding structure on the driving piece 312 is matched with the limit end 313 a; similarly, when the driving screw 5 is driven by the first operating mechanism 1 to rotate in the opposite direction, the driving member 312 generates a tendency of linear motion toward the direction approaching the grounding contact block 2 under the action of the driving screw 5, and meanwhile, the circular protrusion structures on the side walls of the driving member 312 are in limit fit with the two side edges of the limit groove 313, the movement tendency 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 to the grounding contact block 2, along with the continuous rotation of the driving screw 5, the guide groove 313 inclines gradually from the direction perpendicular to the driving screw 5 to the direction approaching the grounding contact block 2, the driving member 312 performs linear motion toward the grounding contact block 2 on the driving screw 5, and meanwhile, the driving member 312 also slides along the guide groove 313 to the direction far from the limit end 313a, and when the second moving contact 311 does not need to be matched with the grounding contact block 2, the driving screw 5 rotates forward, the driving member 312 slides along the guiding groove 313 toward the direction close to the limiting end 313a and makes a linear motion on the driving screw 5 away from the grounding contact block 2, the second moving contact 311 rotates and returns to the initial state by the limiting matching of the driving member 312 and the edges of the two sides of the guiding groove 313, and at this time, the circular limiting protrusion structure on the driving member 312 is matched with the limiting end 313 a.
As shown in fig. 13-18, the embedded pole 7 for supporting the switchgear includes an insulating housing 71, one end of the insulating housing 71 is used as a supporting end for supporting and connecting with the sealing mounting plate 8, see fig. 16-18, the other end face of the insulating housing 71 is provided with a second threading hole, the outer wall of the same side of the insulating housing 71 is provided with a first threading hole and a supporting boss 77, the central axis of the first threading hole coincides with the central axis of the supporting boss 77, the first perforation is located in the middle of the insulating housing 71, the supporting boss 77 is located on the side away from the supporting end for supporting the stationary contact base 4 in the switchgear, a conductive member chamber 72 and a sealed vacuum interrupter 73 are provided inside the insulating housing 71, a moving end 731 of the vacuum interrupter 73 for connecting with 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 the first threading, the static end 732 of the vacuum arc extinguish chamber 73, which is used for being connected with the static contact of the circuit breaker, is provided with a second wiring terminal 75, the second wiring terminal 75 corresponds to the second threading hole, the second wiring terminal 75 is connected with a busbar in the gas-filled cabinet through the second threading hole, and the second wiring terminal 75 at the end part is favorable for being connected with the busbar of the gas-filled cabinet, so that the circuit connection in the gas-filled cabinet is simple.
As shown in fig. 15 and 16, at least two through holes 76 are formed in the side wall of the conductive component cavity 72, the through holes 76 are located on one side close to the sealing and mounting plate 8, the through holes 76 are used for dissipating heat inside the solid-sealed polar pole 7, and meanwhile, a detection probe used for detecting the internal temperature of the solid-sealed polar pole 7 can be placed into the conductive component cavity 72 through the through holes 76 without damaging the solid-sealed polar pole 7, so that the problem that the traditional solid-sealed polar pole 7 is not easy to bury is solved. Preferably, two opposite through holes 76 are formed in the sidewall of the conductive member chamber 72, and the two opposite through holes 76 are used for convection heat dissipation of the conductive member chamber 72.
Further, it is preferable that the insulating housing 71 is made of a dark insulating material, the insulating housing 71 is generally formed by casting epoxy resin, and the dark insulating housing 71 is made by adding a dark pigment with high emissivity into the epoxy resin material, so that the heat dissipation effect of the insulating housing 71 is improved; the outer surface of the insulating shell 71 is preferably frosted, which is beneficial to increase the surface area and heat dissipation capacity.
As shown in fig. 15 and 16, a movable guide rod connected to the movable end 731 of the vacuum interrupter 73 is disposed in the conductive member chamber 72, the movable guide rod is disposed in the conductive member chamber 72 in a penetrating manner, one end of the movable guide rod is connected to the movable end 731, the other end of the movable guide rod passes through the conductive member chamber 72, the supporting end and the sealing mounting plate 8 to be connected to the operating mechanism, the inner diameter of the conductive member chamber 72 is larger than the inner diameter of the vacuum interrupter 73, so that the sidewall of one side of the conductive member chamber 72 is smoothly connected to the sidewall of one side of the vacuum interrupter 73, the sidewall of the other side of the conductive member chamber 72 is located outside the sidewall of the other side of the vacuum interrupter 73, the sidewall of the other side of the conductive member chamber 72 is connected to the sidewall of the other side of the vacuum interrupter 73, and the first wiring hole is disposed at the connection position, so as to increase the volume of, affecting the product performance.
As shown in fig. 15 and 16, the first terminal 74 includes a flexible connection 741 and a connection plate 742, one end of the flexible connection 741 is used for connecting with the movable end 731 of the vacuum interrupter 73 and one end of the movable guide rod, the other end of the flexible connection 741 is connected with the connection plate 742, the connection plate 742 is disposed along the axial direction of the embedded pole 7, and one end of the connection plate 742 protrudes out of the insulating housing 71 through the first threading hole for connecting with the middle contact 3 of the switchgear. Preferably, the connecting plate 742 is a rectangular connecting plate 742, a notch 742a which can be engaged with one side of the first threading hole is formed in one end of the connecting plate which is used for being connected with the flexible connection 741, the end extending out of the first threading hole serves as a connecting portion, the protruding height of the connecting portion is larger than the height of the supporting boss 77, a through bolt hole is formed in the connecting portion, the connecting portion is arranged along the axial direction of the solid-sealed pole 7, the central axis of the bolt hole is perpendicular to the axial direction of the solid-sealed pole 7, and the connecting portion is connected with the intermediate contact 3 in the switch device to form a plug-in structure, so that the intermediate contact 3 can be supported while wiring is achieved. Specifically, when the three-position disconnecting switch is of a direct-acting type, preferably, the intermediate contact 3 of the three-position disconnecting switch is as described in the first embodiment, the intermediate contact 3 includes a three-way intermediate contact base 302, the lower portion of the three-way intermediate contact base 302 is communicated with the upper portion, two side edges of the lower portion of the three-way intermediate contact base 302 protrude outwards to form two connecting convex edges 303 arranged at intervals oppositely and used for being connected with the first terminal 74, the connecting convex edges 303 are provided with connecting holes and are provided with bolts, a connecting portion of the first terminal 74 extends into a space between the two connecting convex edges 303, the bolt holes correspond to the connecting holes, and the first terminal 74 and the three-way intermediate contact base 302 form a plug-in structure under the common cooperation of the connecting convex edges; in the case that the three-position disconnecting switch is a disconnecting link type three-position disconnecting switch, preferably, the middle contact 3 of the three-position disconnecting switch is as described in the second embodiment, the middle contact block 302 includes the second movable contact 311, the second movable contact 311 is connected by two disc springs arranged oppositely, 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 a bolt (see fig. 3-6, 9-12).
As shown in fig. 17 to 18, the insulating housing 71 is provided with mounting holes 711 for connecting to the seal mounting plate 8, the mounting holes 711 are through holes, the seal mounting plate 8 is provided with fixing holes 81 corresponding to the mounting holes 711, the fixing holes 81 are female screw holes that do not penetrate through both sides of the seal mounting plate 8, and air leakage points are prevented when the insulating housing 71 is connected to the seal mounting plate 8, and in fig. 18, four fixing holes 81 are provided for each insulating housing 71. As shown in fig. 17, it is preferable that a bellows 79 is provided inside the support end of the insulating housing 71, the insulating housing 71 is sealingly connected to the seal mounting plate 8 by the bellows 79, the bellows 79 is provided inside the support end of the insulating housing 71, the bellows 79 is provided with a seal ring mounting groove, and the bellows 79 and the seal mounting plate 8 are sealed by an O-ring.
An embodiment of the embedded pole 7 is described with reference to fig. 6-7 and 13-18, the embedded pole 7 includes an insulating housing 71, the insulating housing 71 is a hollow cylinder with one closed end and one open end, a second threading hole is arranged on the end surface of the closed end, the open end is used as a supporting end to be supported and fixed on the sealing installation plate 8, a rectangular first threading hole is arranged in the middle of the outer side wall of the hollow cylinder, an annular bulge 78 is arranged around the periphery of the first perforation, a circular supporting boss 77 is convexly arranged on the outer side wall of the closed end of the hollow cylinder, the first threading hole is coincided with the central axis of the supporting boss 77, the protruding height of the annular protrusion 78 is equal to that of the supporting boss 77, one end of the connecting plate extending out of the first threading hole is used as a connecting part, the connecting part protrudes out of the annular protrusion 78, and the annular protrusion 78 and the connecting part are together in inserted fit with the lower part of the tee joint middle contact seat 302; two opposite through holes 76 are formed in the side wall of the insulating shell 71 between the supporting end and the first threading hole, the central axis of one through hole 76 coincides with the central axis of the first threading hole, preferably, the side wall of one side close to the supporting end protrudes outwards to enable the side wall of one side of the solid-sealed polar pole 7 to be a stepped surface with one higher end and one lower end, so that two parts with different inner diameters are formed in the insulating shell 71, wherein the conductive piece cavity 72 corresponds to the higher end, namely the conductive piece cavity 72 corresponds to the part with a larger inner diameter, the vacuum arc-extinguishing chamber 73 corresponds to the lower end, namely the vacuum arc-extinguishing chamber 73 corresponds to the part with a smaller inner diameter, and the first threading hole corresponds to the joint of the higher end and the lower end, namely the joint of the conductive piece cavity 72 and the vacuum arc-extinguishing chamber 73 is correspondingly arranged at. Preferably, as shown in fig. 7 and 13-15, the supporting end of the insulating housing 71 protrudes outward in the radial direction to form a convex edge, the convex edge is provided with a mounting hole 711 for connecting with the sealing mounting plate 8, the mounting hole 711 is a through hole, one side of 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 thread hole which does not penetrate through two sides of the sealing mounting plate 8, the existing fixing hole 81 is a through hole, and the mounting hole 711 is an internal thread hole, and the structure of the matching connection reduces the air leakage point of the sealing mounting plate 8. Preferably the support end is equipped with bellows 79, and insulating casing 71 passes through bellows 79 and 8 sealing connection of sealing mounting panel, and bellows 79 passes sealing mounting panel 8 and has further increased insulating casing 71 and 8 support stability of sealing mounting panel, is equipped with the sealing washer mounting groove in one side that bellows 79 passed sealing mounting panel 8, the uncovered orientation sealing mounting panel 8 of sealing washer mounting groove is sealed through installing O shape sealing washer in sealing mounting groove to the fixed orifices 81 that is used for fixed bellows 79 also is the internal thread hole, prevents to produce the gas leakage point on sealing mounting panel 8.
In the application, the size of the cavity of the vacuum arc-extinguishing chamber 73 is preferably controlled by changing the pouring thickness of the epoxy resin, and under the condition that the outer diameter size of the insulating shell 71 is not changed, the size of the cavity of the insulating shell 71 is determined by adjusting the thickness of the poured epoxy resin or the encapsulation thickness of the vacuum arc-extinguishing chamber 73, so that the vacuum arc-extinguishing chamber can be suitable for 12kV and 24kV voltage levels, 630A-1600A current levels and can accommodate different types of vacuum arc-extinguishing chambers 73, and the limitation that the cavity of the insulating shell 71 designed in the traditional scheme can only be suitable for one or more types of vacuum arc-extinguishing chambers 73 with the same voltage level. In engineering application, the invention can be applied to the inflatable cabinet with the voltage class of 12kV and 24kV and the current class of 630A-1600A only by replacing the vacuum arc-extinguishing chamber 73 and the flexible connection 741, and can meet the requirements of electrical insulation distance and electric strength resistance.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010590103.3A CN111627782A (en) | 2020-06-24 | 2020-06-24 | Combination of three-station disconnecting switch and circuit breaker suitable for inflating cabinet |
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| CN202010590103.3A CN111627782A (en) | 2020-06-24 | 2020-06-24 | Combination of three-station disconnecting switch and circuit breaker suitable for inflating cabinet |
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| CN111627782A true CN111627782A (en) | 2020-09-04 |
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| CN202010590103.3A Pending CN111627782A (en) | 2020-06-24 | 2020-06-24 | Combination of three-station disconnecting switch and circuit breaker suitable for inflating cabinet |
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| CN112688223A (en) * | 2020-12-07 | 2021-04-20 | 平高集团有限公司 | Inflating cabinet |
| CN112713024A (en) * | 2020-12-28 | 2021-04-27 | 甘肃长城电工电器工程研究院有限公司 | Medium-voltage environment-friendly switch assembly |
| CN112736752A (en) * | 2020-12-25 | 2021-04-30 | 天水长城开关厂集团有限公司 | Isolator of aerify cabinet star connection and triangle-shaped wiring conversion |
| CN117595133A (en) * | 2023-10-30 | 2024-02-23 | 江苏双汇电力发展股份有限公司 | Direct-acting type inflatable high-voltage switch cabinet and working method thereof |
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