CN112259389B - Operating mechanism of unidirectional on-load tap-changer - Google Patents
Operating mechanism of unidirectional on-load tap-changer Download PDFInfo
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- CN112259389B CN112259389B CN202011098480.1A CN202011098480A CN112259389B CN 112259389 B CN112259389 B CN 112259389B CN 202011098480 A CN202011098480 A CN 202011098480A CN 112259389 B CN112259389 B CN 112259389B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/38—Driving mechanisms, i.e. for transmitting driving force to the contacts using spring or other flexible shaft coupling
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Abstract
The invention discloses an operating mechanism of a unidirectional on-load tap-changer. The input assembly comprises an input gear and an output gear, the input gear is driven by external force to rotate, the input gear is connected with the output gear through a same-direction transmission path and a reverse transmission path, when the rotation direction of the input gear is in the same direction as that of the output gear, the input gear drives the output gear to rotate through the same-direction transmission path, and when the rotation direction of the input gear is reverse to that of the output gear, the input gear drives the output gear to rotate through the reverse transmission path, and the output gear always rotates in the same direction. A stored energy assembly including a spring and a positioning device is connected to the input assembly. The output assembly is connected to the energy storage assembly. The output gear of the input assembly rotates to drive the energy storage assembly to act, the positioning device is located at the locking position, the spring of the energy storage assembly stores energy, the output assembly is locked, the output gear rotates to the release position, the positioning device releases the output assembly to unlock, and the spring of the energy storage assembly releases energy to drive the output assembly to rotate.
Description
Technical Field
The invention relates to the field of power equipment, in particular to an operating mechanism of an on-load tap-changer.
Background
On-load tap changers require switching between different winding taps. The operating mechanism is used for driving the on-load tapping switch to change. The traditional combined on-load tap-changer operating mechanisms are all gun bolt release mechanisms, and the operating characteristics of the conventional combined on-load tap-changer operating mechanisms are that the operating direction of an output assembly is bidirectional rotation, namely back and forth rotation. The trigger release mechanism is divided into an eccentric wheel type and a crank slider type according to different movement modes, and the eccentric wheel type and the crank slider type have the common characteristics that the trigger release mechanism outputs back and forth rotation no matter the input direction. The following describes the principle of the structure of the trigger release mechanism in the transmission technology by taking the eccentric wheel structure as an example.
Fig. 1a and 1b disclose a schematic diagram of an eccentric bolt release mechanism used in the prior art. Wherein fig. 1a discloses the principle of the cross-section operation of the release mechanism of an eccentric bolt, and fig. 1b discloses the principle of the top operation of the release mechanism of an eccentric bolt. It should be noted that fig. 1a and 1b are schematic diagrams, so that the structure is abstracted, only components related to the operation principle are shown, and the rest of the components are hidden. The components shown in fig. 1a and 1b are different from each other at different viewing angles.
Referring to fig. 1a and 1b, the eccentric bolt-releasing mechanism includes: eccentric 101, upper slide box 102, lower slide box 103, cam disk 104, claw 105, energy storage spring 106, return spring 107, slide rail 108, slider 109, guide rail 110, bracket 111, stopper 112, rotary shaft 113, and damper 114. A guide rail 110 is arranged between the upper slide box 102 and the lower slide box 103, and an energy storage spring 106 is arranged on the guide rail 110 between the upper slide box and the lower slide box. The eccentric wheel 101 is connected to a rotating shaft 113, the rotating shaft 113 is an input shaft, and the rotating shaft 113 is driven to rotate so as to drive the eccentric wheel 101 to rotate. The upper slide box 102 is provided with a stop block 112, and when the eccentric wheel 101 rotates, the stop block 112 is pushed, and the upper slide box 102 is driven to move by the stop block 112. The cam plate 104 is connected to the slide-down case 103, and the circular arc surface of the cam plate 104 has a stepped surface by which the claw 105 can lock the cam plate 104. When the pawl 105 locks the cam plate 104, the position of the slide-down cassette 103 is also locked. The eccentric wheel bolt release mechanism is integrally mounted on the bracket 111. When the eccentric wheel 101 rotates, the upper slide box 102 is driven to move along the guide rail 110. Since the pawl 105 locks the cam plate 104 at this time so that the lower slide box 103 remains stationary in its original position, the upper slide box 102 and the lower slide box 103 undergo a relative movement which compresses the charge spring 106 between the upper and lower slide boxes. When the eccentric 101 rotates and moves the upper slide box 102 to the release position, the side arms 121 (shown with reference to fig. 2) on the upper slide box 102 push the pawls 105 so that the pawls 105 move away from the stepped surface on the cam plate 104. When the pawl 105 no longer locks the cam plate 104, the slide-down cassette 103 is also released. At this time, the energy storage spring 106 releases energy to drive the lower slide box 103 to move and the cam plate 104 to rotate. Referring to fig. 1b, the cam plate 104 is provided with a bumper 114 in its rotated into position. The shock absorber 114 can reduce the shock of each operation of the cam plate 104 and the slide down box 103, and can extend the mechanical life. After the releasing action is completed, the pawl 105 on the other side catches the stepped surface on the other side of the cam plate 104 under the action of the return spring 107. The slide down box 103 and cam plate 104 are again locked and the entire cam bolt face release mechanism returns to its original state ready for the next action. Referring to fig. 1b, it can be seen that the pawl 105 catches the cam plate 104 from the other side after one action is completed, so that the cam plate 104 rotates in the opposite direction upon the next action. That is, the cam plate 104 changes the direction of rotation after each actuation, and rotates back and forth. Therefore, the cam plate as output always rotates back and forth regardless of whether the input shaft rotates clockwise or counterclockwise.
Fig. 2 discloses a block diagram of an eccentric bolt release mechanism used in the prior art. Fig. 2 is a specific implementation of the principle of the eccentric bolt face release mechanism shown in fig. 1a and 1 b. In fig. 2, eccentric 101, upper slide box 102, lower slide box 103, cam plate 104, pawl 105, guide rail 110, bracket 111, stop 112, spindle 113 and side arm 121 on upper slide box 102 are disclosed.
The reciprocating release mechanism is capable of providing a unidirectional rotational output. Figures 3a and 3b disclose a schematic of a reciprocating release mechanism. The basic composition of the reciprocating release mechanism includes a tension spring S and a rotatable crank arm R. One end of a tension spring with strong tension is fixed on a point B on the crank arm, and the other end of the tension spring is fixed on a point C. The crank arm rotates around the circle center A. The turning arm is turned to the position with the farthest point C, which is the position of dead point D. When the tension spring is in a natural state, the crank arm is positioned at the position closest to the fixed point C, and the tension spring does not store energy. Under the drive of external force, the crank arm rotates clockwise at an angular velocity omega, and the angular velocity omega is the driving angular velocity and is a relatively low rotating speed. Before the crank arm rotates to reach the dead point D, the tension spring is gradually stretched to store energy. Referring to fig. 3b, after the turning arm rotates to reach and pass the dead point D, the tension spring is released, and the tension spring contracts to release energy, and at this time, the turning arm is driven to rotate clockwise at a high angular velocity ω1 (the releasing direction is the same as the energy storing direction). The angular speed omega 1 is a conversion angular speed, the conversion angular speed omega 1 obtained by energy release of a tension spring is utilized, and a groove pulley is driven by a groove pulling piece to drive a main shaft of the on-load tap changer to complete primary conversion. In the reciprocating release mechanism shown in fig. 3a and 3b, the rotation direction of the output component, namely the crank arm, is always the same direction, and the crank arm stores energy and releases energy respectively at different stages of each rotation, so that unidirectional rotation output is realized.
Disclosure of Invention
The invention provides an operating mechanism of a unidirectional on-load tap-changer, which is matched with a reciprocating release mechanism to realize unidirectional output.
According to an embodiment of the present invention, an operating mechanism of a unidirectional on-load tap-changer is provided, including: input subassembly, energy storage subassembly and output subassembly. The input assembly comprises an input gear and an output gear, the input gear is driven by external force to rotate, the input gear is connected with the output gear through a same-direction transmission path and a reverse transmission path, when the rotation direction of the input gear is in the same direction as that of the output gear, the input gear drives the output gear to rotate through the same-direction transmission path, and when the rotation direction of the input gear is reverse to that of the output gear, the input gear drives the output gear to rotate through the reverse transmission path, and the output gear always rotates in the same direction. The energy storage assembly is connected to the input assembly, and the energy storage assembly includes a spring and a positioning device. The output assembly is connected to the energy storage assembly. The output gear of the input assembly rotates to drive the energy storage assembly to act, the positioning device is located at a locking position, the spring of the energy storage assembly stores energy, the output assembly is locked, the output gear rotates to a release position, the positioning device releases the output assembly to unlock, the spring of the energy storage assembly releases energy to drive the output assembly to rotate, the output assembly rotates to the next locking position, and the positioning device locks the output assembly again.
In one embodiment, the equidirectional transmission path of the input assembly includes an equidirectional transmission shaft to which the input gear is connected and an equidirectional overrunning clutch mounted on the equidirectional transmission shaft to which the output gear is connected. When the rotation direction of the input gear is same as that of the output gear, the same-direction overrunning clutch is meshed with the same-direction transmission shaft, the input gear drives the output gear to rotate in the same direction through the same-direction transmission shaft and the same-direction overrunning clutch, and when the rotation direction of the input gear is opposite to that of the output gear, the same-direction overrunning clutch is in hollow with the same-direction transmission shaft.
In one embodiment, the reverse drive path of the input assembly includes a first transition gear, a second transition gear, a third transition gear, a reverse drive shaft, and a reverse overrunning clutch, the input gear is meshed with the first transition gear, the first transition gear is connected to the reverse overrunning clutch, the reverse overrunning clutch is mounted on the reverse drive shaft, the reverse drive shaft is connected to the second transition gear, the second transition gear is meshed with the third transition gear, and the third transition gear is meshed with the output gear. When the rotation direction of the input gear is reverse to that of the output gear, the output gear drives the first transition gear to rotate, the reverse overrunning clutch is meshed with the reverse transmission shaft, the first transition gear drives the reverse transmission shaft to rotate through the reverse overrunning clutch, the reverse transmission shaft drives the second transition gear to rotate, the second transition gear drives the third transition gear to rotate, the third transition gear drives the output gear to rotate, the rotation direction of the output gear is reverse to that of the input gear, and when the rotation direction of the input gear is in the same direction as that of the output gear, the reverse overrunning clutch is empty with the reverse transmission shaft.
In one embodiment, the energy storage assembly includes: crank pivot, connecting rod, slide bar, slider and spring. The crank rotating shaft is connected with the output gear, the crank rotating shaft rotates along with the output gear, the connecting rod is arranged on the crank rotating shaft, the sliding block is rotationally arranged at the end part of the connecting rod, the sliding block is sleeved on the sliding rod and can slide along the sliding rod, and the spring is arranged on the sliding rod. The output gear rotates to drive the crank rotating shaft to rotate, the crank rotating shaft drives the connecting rod and drives the sliding block to slide along the sliding rod through the connecting rod, and when the positioning device is positioned at the locking position, the sliding block pushes the spring to compress, and the spring stores energy.
In one embodiment, the output assembly is an output rotary table, the sliding rod is arranged on the output rotary table, when the positioning device is located at the locking position, the output assembly is locked, the spring stores energy, the positioning device is released, the output rotary table is unlocked, and the spring releases energy to drive the output rotary table to rotate.
In one embodiment, the positioning device of the energy storage assembly comprises a bolt, a roller and a positioning groove, the bolt is arranged on the output rotary table, the positioning groove is arranged on the frame of the operating mechanism, the roller is arranged on the crank rotary shaft, the bolt is inserted into one positioning groove, the positioning device is positioned at a locking position, the output rotary table is locked, the output gear drives the crank rotary shaft to rotate to a release position, the roller pushes the bolt to withdraw from the positioning groove, the positioning device releases the output rotary table to unlock, the spring releases energy to drive the output rotary table to rotate, the bolt rotates along with the output rotary table and is inserted into the next positioning groove, and the positioning device locks the output rotary table again.
In one embodiment, the output assembly further comprises a buffer device, the buffer device comprises a damping piece and a blocking piece, the damping piece is mounted on the output rotary table to rotate along with the output rotary table, the blocking piece is mounted on the frame of the operating mechanism, the damping piece is in contact with the blocking piece before the output rotary table rotates to the next locking position, and the damping piece enables the rotation speed of the output rotary table to be reduced.
In one embodiment, the frame of the operating mechanism comprises a lower bracket and an upper bracket, the input assembly is mounted on the lower bracket and distributed on two sides of the lower bracket, and the energy storage assembly and the output assembly are mounted between the lower bracket and the upper bracket.
In one embodiment, the blocking pieces and the positioning grooves are provided on the upper bracket, and the blocking pieces and the positioning grooves are provided to be uniformly distributed along the circumference.
The operating mechanism of the unidirectional on-load tap-changer has the following characteristics and advantages: the overrunning clutch forms a same-direction transmission path and a reverse transmission path, so that the output gear always outputs rotation in a single direction no matter the input gear rotates clockwise or anticlockwise in the input assembly. The crank rotating shaft and the sliding block form a connecting rod mechanism to realize energy storage of the spring, so that large-rotation-angle input can be realized. A plurality of damping and buffering devices are arranged to reduce the impact of the output turntable on the mechanism and prolong the mechanical life of the operating mechanism.
Drawings
Fig. 1a and 1b disclose a schematic diagram of an eccentric bolt release mechanism used in the prior art.
Fig. 2 discloses a block diagram of an eccentric bolt release mechanism used in the prior art.
Figures 3a and 3b disclose a schematic of a reciprocating release mechanism.
Fig. 4 discloses a schematic diagram of the input assembly in the operating mechanism of the unidirectional on-load tap-changer according to an embodiment of the invention.
Fig. 5a, 5b and 5c disclose schematic diagrams of the energy storage assembly in the operating mechanism of the unidirectional on-load tap-changer according to an embodiment of the invention.
Fig. 6a and 6b disclose exploded structural views of an operating mechanism of a unidirectional on-load tap-changer according to an embodiment of the invention.
Fig. 7a and 7b disclose a combined structural view of an operating mechanism of a unidirectional on-load tap-changer according to an embodiment of the invention.
Detailed Description
The invention provides an operating mechanism of a unidirectional on-load tap-changer, which comprises an input assembly, an energy storage assembly and an output assembly. The input assembly comprises an input gear and an output gear, the input gear is driven by external force to rotate, the input gear is connected with the output gear through a same-direction transmission path and a reverse transmission path, when the rotation direction of the input gear is in the same direction as that of the output gear, the input gear drives the output gear to rotate through the same-direction transmission path, and when the rotation direction of the input gear is reverse to that of the output gear, the input gear drives the output gear to rotate through the reverse transmission path, and the output gear always rotates in the same direction. The energy storage assembly is connected to the input assembly, and the energy storage assembly includes a spring and a positioning device. The output assembly is connected to the energy storage assembly. The output gear of the input assembly rotates to drive the energy storage assembly to act, the positioning device is located at the locking position, the spring of the energy storage assembly stores energy, the output assembly is locked, the output gear rotates to the release position, the positioning device releases the output assembly to unlock, the spring of the energy storage assembly releases energy to drive the output assembly to rotate, the output assembly rotates to the next locking position, and the positioning device locks the output assembly again.
In the following description, the terms "same direction", "opposite direction" will be used. The definition of "same direction" and "reverse direction" herein refers only to the relative rotation direction of the input gear and the output gear, and the same direction transmission shaft, the reverse transmission shaft, the same direction overrunning clutch and the reverse overrunning clutch are divided according to the names of transmission paths, and do not limit the actual rotation direction.
The input assembly in the operating mechanism of the unidirectional on-load tap-changer is of a unidirectional output structure, the input assembly comprises an input gear and an output gear, the input gear is driven by external force to rotate, and the input gear is connected with the output gear through a same-direction transmission path and a reverse transmission path. When the rotation direction of the input gear is in the same direction as that of the output gear, the input gear drives the output gear to rotate through the same-direction transmission path, and when the rotation direction of the input gear is reverse to that of the output gear, the input gear drives the output gear to rotate through the reverse transmission path. So that the output gear always rotates in the same direction. Fig. 4 discloses a schematic diagram of the input assembly in the operating mechanism of the unidirectional on-load tap-changer according to an embodiment of the invention.
The input assembly equidirectional drive path includes an equidirectional drive shaft 402 and an equidirectional overrunning clutch 403. The input gear 401 is connected to the same-direction transmission shaft 402, the same-direction overrunning clutch 403 is mounted on the same-direction transmission shaft 402, and the output gear 404 is connected to the same-direction overrunning clutch 403. The output gear 404 is configured to rotate in a single direction, and the output rotation direction of the output gear 404 is fixed to be clockwise or counterclockwise according to different application requirements. When the rotational direction of the output gear 404 is determined, the same rotational direction of the input gear as the output gear is referred to as "same direction", and conversely as "reverse direction". When the rotation direction of the input gear 401 is the same as that of the output gear 404, the same-direction overrunning clutch 403 is meshed with the same-direction transmission shaft 402, and the input gear 401 drives the output gear 404 to rotate in the same direction through the same-direction transmission shaft 402 and the same-direction overrunning clutch 403. When the rotation direction of the input gear 401 is opposite to that of the output gear 404, the same-direction overrunning clutch 403 and the same-direction transmission shaft 402 are in the idle state, and when the same-direction overrunning clutch and the same-direction transmission shaft are in the idle state, the same-direction transmission path does not transmit power.
The reverse drive path of the input assembly includes a first transition gear 405, a second transition gear 408, a third transition gear 409, a reverse drive shaft 407, and a reverse overrunning clutch 406. The input gear 401 meshes with a first transition gear 405. The first transition gear 405 is connected to a reverse overrunning clutch 406, the reverse overrunning clutch 406 being mounted on a reverse drive shaft 407. The counter drive shaft 407 is connected to a second transition gear 408, the second transition gear 408 is meshed with a third transition gear 409, and the third transition gear 409 is meshed with the output gear 404. When the rotation direction of the input gear 401 is reverse to that of the output gear 404, the same-direction transmission path is in an idle state, and no power transmission is performed. At this time, the output gear 401 drives the first transition gear 405 to rotate, and the reverse overrunning clutch 406 is meshed with the reverse transmission shaft 407. The first transition gear passes through 405 and drives reverse drive shaft 407 to rotate through reverse overrunning clutch 506. The reverse transmission shaft 407 drives the second transition gear 408 to rotate, and the second transition gear 408 drives the third transition gear 408 to rotate. The third transition gear 409 rotates the output gear 404. The direction of rotation of the output gear 404 is reversed from the direction of rotation of the input gear 401 by successive gear mesh reversals and transfers. When the rotation direction of the input gear 401 is the same as that of the output gear 404, the reverse overrunning clutch 406 and the reverse transmission shaft 407 are empty. At this time, although the input gear 401 drives the first transition gear 405 to rotate, the reverse overrunning clutch 406 and the reverse transmission shaft 407 are empty, so that the rotation is not transmitted to the second transition gear 408, and the reverse transmission path does not transmit power. At this time, the same direction transmission path is in a working state to transmit power.
By arranging the same-direction transmission path and the reverse transmission path, when the rotation direction of the input gear is the same as or reverse to that of the output gear, the same-direction transmission path and the reverse transmission path work alternately, so that the output gear is ensured to rotate and output in a single direction all the time. In the embodiment shown in fig. 4, each gear is respectively disposed at two sides of the frame 410, the co-rotating transmission shaft 402 and the counter-rotating transmission shaft 407 pass through the frame 410 to realize the linkage of the gears, and a bearing 411 is disposed at the position where the transmission shaft passes through the frame. The gear is also provided with a bearing at the position of the rack, and the gear realizes rotation through the bearing.
Fig. 5a, 5b and 5c disclose schematic diagrams of the energy storage assembly in the operating mechanism of the unidirectional on-load tap-changer according to an embodiment of the invention. The energy storage assembly includes: crank shaft 501, connecting rod 502, slide bar 503, slider 504, and spring 505. The energy storage assembly also includes a positioning assembly, the positioning assembly including: latch 506, roller 507 and detent 508. The output component connected to the energy storage component is an output turntable 509. The crank shaft 501 is connected to the output gear, and the crank shaft 501 rotates following the output gear. The connecting rod 502 is mounted on the crank shaft 501. A slider 503 is mounted at the end of the link 502, the slider 503 being fitted over the slide bar 504 and being able to slide along the slide bar 504. Spring 505 is mounted on slide bar 504. The slide bar 504 is mounted on an output turntable 509. The latch 506 is mounted on an output turntable 509 and the detent 508 is provided on the housing of the operating mechanism. The roller 507 is mounted on the crank shaft 501. When the latch 506 is inserted into one of the detents 508, the detent is in the latched position and the output dial 509 is latched against rotation.
Referring to fig. 5a and 5b, in the process of rotating from fig. 5a to fig. 5b, the output gear rotates to drive the crank shaft 501 to rotate at the angular velocity ω, and the crank shaft 501 drives the link 502 and drives the slider 503 to slide along the slide bar 504 through the link 502. When the positioning device is in the locked position, the position of the output dial 509 is fixed, so that the slider 503 will push the spring 505 to compress, and the spring 505 stores energy.
In the position shown in fig. 5b, the output gear rotates the crank shaft 501 to the release position. The roller 507 mounted on the crank shaft 501 rotates to a position where the latch 506 is located. In the state shown in fig. 5b, the crank shaft 501 continues to rotate at an angular velocity ω. In the released position, the roller 507 pushes the latch 506 out of the detent 508. When the latch 506 exits the detent 508, the detent releases and unlocks the output dial 509.
After the output rotary table 509 is unlocked, the process of fig. 5b to 5c is a process that the spring releases energy to drive the output rotary table to rotate. After the output rotary table is released, the positioning device is released, the output rotary table is unlocked, and the spring releases energy to drive the output rotary table 509 to rotate at the angular speed omega 1. The angular velocity ω1 is a rotational speed driven by the release of energy from the spring, and the rotational speed of the angular velocity ω1 is greater than the angular velocity ω. A latch 506 mounted on an output rotary table 509 follows the output rotary table and is inserted into a next detent 508 in the housing. After the bolt is reinserted into the positioning groove, the positioning device locks the output rotary table again. Comparing fig. 5c and 5a, the energy storage assembly and the output assembly are rotated through an angle after one energy storage and release process when the output turntable is locked again, and the energy storage assembly and the output assembly are operated cyclically in this way.
Fig. 6a and 6b disclose exploded structural views of an operating mechanism of a unidirectional on-load tap-changer according to an embodiment of the invention. Fig. 7a and 7b disclose a combined structural view of an operating mechanism of a unidirectional on-load tap-changer according to an embodiment of the invention. Fig. 6a, 6b, 7a and 7b are specific implementations of the combination of the principle of the input assembly shown in fig. 4 and the principle of the energy storage assembly and the output assembly shown in fig. 5a, 5b and 5 c. Referring to fig. 6a, 6b, 7a and 7b, the input, energy storage and output components of the operating mechanism are mounted on a frame. In the illustrated embodiment, the frame includes a lower bracket 601 and an upper bracket 602. The input assembly is mounted on the lower bracket 601 and distributed on both sides of the lower bracket 601, and the energy storage assembly and the output assembly are mounted between the lower bracket 601 and the upper bracket 602. In the illustrated embodiment, the input gear 401, the first transition gear 405, and the reverse overrunning clutch 406 in the input assembly are mounted below the lower bracket 601. The output gear 404, the equidirectional overrunning clutch 403, the second transition gear 408 and the third transition gear 409 are mounted above the lower bracket 601. The same direction transmission shaft 402 and the reverse transmission shaft 407 pass through the lower bracket 601 to transmit. The crank shaft 501 in the energy storage assembly and the output assembly is connected with the output gear 404, and the crank shaft 501 rotates along with the output gear 404. The connecting rod 502 is mounted on the crank shaft 501. The slider 503 is rotatably mounted at the end of the connecting rod 502, because the connecting rod 502 will rotate along the crank shaft 501, in order to ensure that the slider 503 can slide along the slide rod 504 smoothly all the time, the slider 503 needs to have a relative rotation capability with the connecting rod 502. The slider 503 is sleeved on the slide bar 504 and can slide along the slide bar 504. Spring 505 is mounted on slide bar 504. The slide bar 504 is mounted on an output turntable 509. The latch 506 is mounted on an output dial 509. The roller 507 is mounted on the crank shaft 501. The detent 508 is provided on the upper bracket 602 of the operating mechanism. In the illustrated embodiment, the detent 508 is provided at the bottom of the upper bracket 602. Referring to fig. 6b, a plurality of detents 508 are provided circumferentially evenly distributed about the bottom of the upper bracket 602. In the illustrated embodiment, the output assembly further includes a damping device including a damper 510 and a stop 511. The damping member 510 is mounted on the output rotary table 509 to rotate with the output rotary table 509. The blocking piece 511 is mounted on the frame of the operating mechanism. In the illustrated embodiment, the blocking pieces 511 are provided on the upper bracket 602, and the number of blocking pieces 511 is also a plurality, and the plurality of blocking pieces 511 are provided so as to be uniformly distributed on the upper bracket 602 along the circumference. After each release rotation of the output rotary table 509, the damping member 510 contacts one of the blocking blocks 511 before rotating to the next locking position, and the damping member 510 reduces the rotational speed of the output rotary table 509, which reduces the impact of the output rotary table on the whole mechanism, and reduces the rotational speed of the output rotary table 509 even when the next locking position is reached, so that the latch 506 can be inserted into the next positioning slot 508 more easily.
The operating mechanism of the unidirectional on-load tap-changer has the following characteristics and advantages: the overrunning clutch forms a same-direction transmission path and a reverse transmission path, so that the output gear always outputs rotation in a single direction no matter the input gear rotates clockwise or anticlockwise in the input assembly. The crank rotating shaft and the sliding block form a connecting rod mechanism to realize energy storage of the spring, so that large-rotation-angle input can be realized. A plurality of damping and buffering devices are arranged to reduce the impact of the output turntable on the mechanism and prolong the mechanical life of the operating mechanism.
It should also be noted that the above-recited embodiments are merely specific examples of the present invention. It is apparent that the present invention is not limited to the above embodiments, and similar changes or modifications will be apparent to those skilled in the art from the present disclosure, and it is intended to be within the scope of the present invention. The embodiments described above are intended to provide those skilled in the art with a full range of modifications and variations to the embodiments described above without departing from the inventive concept thereof, and therefore the scope of the invention is not limited by the embodiments described above, but is to be accorded the broadest scope consistent with the innovative features recited in the claims.
Claims (8)
1. An operating mechanism for a unidirectional on-load tap-changer, comprising:
the input assembly comprises an input gear and an output gear, the input gear is driven by external force to rotate, the input gear is connected with the output gear through a same-direction transmission path and a reverse transmission path, when the rotation direction of the input gear is in the same direction as that of the output gear, the input gear drives the output gear to rotate through the same-direction transmission path, and when the rotation direction of the input gear is in reverse direction to the output gear, the input gear drives the output gear to rotate through the reverse transmission path, and the output gear always rotates in the same direction;
the energy storage assembly is connected to the input assembly and comprises a spring and a positioning device;
the output assembly is connected to the energy storage assembly;
the positioning device is positioned at a locking position, a spring of the energy storage assembly stores energy, the output assembly is locked, the output gear rotates to a release position and is released to unlock the output assembly, the spring of the energy storage assembly releases energy to drive the output assembly to rotate, the output assembly rotates to the next locking position, and the positioning device locks the output assembly again;
wherein, the energy storage assembly includes: crank shaft, connecting rod, slide bar, slide block and spring;
the crank rotating shaft is connected with the output gear, the crank rotating shaft rotates along with the output gear, the connecting rod is arranged on the crank rotating shaft, the sliding block is rotatably arranged at the end part of the connecting rod, the sliding block is sleeved on the sliding rod and can slide along the sliding rod, and the spring is arranged on the sliding rod;
the output gear rotates to drive the crank rotating shaft to rotate, the crank rotating shaft drives the connecting rod and drives the sliding block to slide along the sliding rod through the connecting rod, and when the positioning device is positioned at the locking position, the sliding block pushes the spring to compress, and the spring stores energy.
2. The operating mechanism of the unidirectional on-load tap-changer of claim 1, wherein the unidirectional transmission path of the input assembly comprises a unidirectional transmission shaft and a unidirectional overrunning clutch, the input gear is connected to the unidirectional transmission shaft, the unidirectional overrunning clutch is mounted on the unidirectional transmission shaft, and the output gear is connected to the unidirectional overrunning clutch;
when the rotation direction of the input gear is same as that of the output gear, the same-direction overrunning clutch is meshed with the same-direction transmission shaft, the input gear drives the output gear to rotate in the same direction through the same-direction transmission shaft and the same-direction overrunning clutch, and when the rotation direction of the input gear is opposite to that of the output gear, the same-direction overrunning clutch is in hollow with the same-direction transmission shaft.
3. The operating mechanism for the one-way on-load tap-changer of claim 2 wherein the reverse drive path of the input assembly includes a first transition gear, a second transition gear, a third transition gear, a reverse drive shaft, and a reverse overrunning clutch, the input gear being in mesh with the first transition gear, the first transition gear being connected to the reverse overrunning clutch, the reverse overrunning clutch being mounted on the reverse drive shaft, the reverse drive shaft being connected to the second transition gear, the second transition gear being in mesh with the third transition gear, the third transition gear being in mesh with the output gear;
when the rotation direction of the input gear is reverse to that of the output gear, the output gear drives the first transition gear to rotate, the reverse overrunning clutch is meshed with the reverse transmission shaft, the first transition gear drives the reverse transmission shaft to rotate through the reverse overrunning clutch, the reverse transmission shaft drives the second transition gear to rotate, the second transition gear drives the third transition gear to rotate, the third transition gear drives the output gear to rotate, the rotation direction of the output gear is reverse to that of the input gear, and when the rotation direction of the input gear is in the same direction as that of the output gear, the reverse overrunning clutch is empty with the reverse transmission shaft.
4. The operating mechanism of the unidirectional on-load tap-changer of claim 1, wherein the output assembly is an output turntable, the slide bar is mounted on the output turntable, and the output assembly is locked when the positioning device is in the locking position, the spring stores energy, the positioning device releases, the output turntable unlocks, and the spring releases energy to drive the output turntable to rotate.
5. The operating mechanism of the unidirectional on-load tap-changer of claim 4, wherein the positioning device of the energy storage assembly comprises a bolt, a roller and a positioning groove, the bolt is arranged on the output turntable, the positioning groove is arranged on a rack of the operating mechanism, the roller is arranged on the crank rotating shaft, the bolt is inserted into one positioning groove, the positioning device is positioned at a locking position, the output turntable is locked, the output gear drives the crank rotating shaft to rotate to a releasing position, the roller pushes the bolt to withdraw from the positioning groove, the positioning device releases to unlock the output turntable, the spring releases energy to drive the output turntable to rotate, the bolt follows the output turntable to rotate and is inserted into the next positioning groove, and the positioning device locks the output turntable again.
6. The operating mechanism of the unidirectional on-load tap-changer of claim 5, wherein the output assembly further comprises a buffer device, the buffer device comprises a damping member and a blocking block, the damping member is mounted on the output turntable to rotate along with the output turntable, the blocking block is mounted on the frame of the operating mechanism, the damping member contacts with the blocking block before the output turntable rotates to the next locking position, and the damping member reduces the rotation speed of the output turntable.
7. The operating mechanism for a one-way on-load tap-changer of claim 6 wherein the frame of the operating mechanism includes a lower bracket and an upper bracket, the input assembly being mounted on and distributed on both sides of the lower bracket, the energy storage assembly and the output assembly being mounted between the lower bracket and the upper bracket.
8. The operating mechanism for a one-way on-load tap changer of claim 6 wherein the stop blocks and the positioning slots are disposed on the upper bracket, the stop blocks and the positioning slots being disposed circumferentially uniformly.
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| CN202011098480.1A CN112259389B (en) | 2020-10-14 | 2020-10-14 | Operating mechanism of unidirectional on-load tap-changer |
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| CN112259389B true CN112259389B (en) | 2023-06-20 |
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| CN116164141B (en) * | 2023-02-12 | 2024-04-23 | 上海交通大学 | Pressure release valve device of on-load tap-changer |
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