CN110931317B - Direct current circuit breaker and self-locking device thereof - Google Patents
Direct current circuit breaker and self-locking device thereof Download PDFInfo
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- CN110931317B CN110931317B CN201910889160.9A CN201910889160A CN110931317B CN 110931317 B CN110931317 B CN 110931317B CN 201910889160 A CN201910889160 A CN 201910889160A CN 110931317 B CN110931317 B CN 110931317B
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- 238000011084 recovery Methods 0.000 claims description 6
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- 239000011148 porous material Substances 0.000 claims description 2
- 230000003578 releasing effect Effects 0.000 abstract description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1009—Interconnected mechanisms
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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
- H01H9/20—Interlocking, locking, or latching mechanisms
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Abstract
The invention provides a direct current circuit breaker and a self-locking device thereof, which can lock the circuit breaker after the circuit breaker is opened, and can carry out switching-on operation only after the self-locking device is unlocked, so as to solve the potential safety hazard of the circuit breaker in the prior art. The self-locking device of the direct current circuit breaker comprises a first locking piece and a second locking piece, wherein the first locking piece is in transmission connection with a shifting fork which transmits closing operation force in the direct current circuit breaker so as to synchronously move along the releasing direction of the shifting fork with the shifting fork, and is provided with a self-locking position corresponding to the releasing state of the shifting fork and an unlocking position corresponding to the restoring state of the shifting fork; the guide movement directions of the first locking piece and the second locking piece are vertical; one of the two locking pieces is provided with a locking pin, and the other locking piece is provided with a locking pin clamping inlet; and the opening edge of the locking pin clamping inlet forms a locking pin stopping edge which is used for supporting the locking pin in a sliding manner when the first locking piece and the second locking piece move relatively along the tripping action direction of the shifting fork.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a direct current circuit breaker and a self-locking device thereof.
Background
The subway traction power supply system in China mostly adopts a direct current power supply mode, and a subway traction substation converts alternating current into direct current through a rectifier and then transmits the direct current to a direct current traction contact network through a direct current cable through a direct current breaker. The direct current circuit breaker is installed in a subway train or a traction power supply system, is used for controlling the introduction and the disconnection of a direct current power supply and also plays a role in protecting the power supply system.
The dc circuit breaker in the prior art has different structures, for example, a dc circuit breaker disclosed in patent documents with an authorization publication number of CN102592897B and an authorization publication date of 2013.07.03, in which a movable contact capable of swinging and a fixed contact are provided, and switching on and off is realized by swinging of the movable contact and contacting and disconnecting with the fixed contact. If the patent application publication No. CN107706043A, application publication No. 2018.02.16 discloses a vacuum dc fast circuit breaker, which includes an insulating box, and a spring mechanism, a moving contact, a stationary contact, an overcurrent tripping device, and an electromagnetic driving device are disposed in the insulating box. The moving contact and the static contact are assembled in the vacuum tube, the moving contact is connected with a conductive sliding rod, and the reciprocating motion of the conductive sliding rod can drive the moving contact to be in contact with and separated from the static contact so as to correspondingly realize the switching-on and switching-off of the circuit breaker.
In the second patent application document, a ratchet wheel is installed at the end part, far away from a moving contact, of a conductive sliding rod, a shifting fork matched with the ratchet wheel in a transmission mode is arranged in an electromagnetic driving device, an electromagnetic mechanism in the electromagnetic driving device can push the shifting fork, the shifting fork has a closing action direction corresponding to the closing action of a direct current circuit breaker at the moment, the shifting fork is matched with the ratchet wheel to drive the conductive sliding rod to overcome the elastic force of a spring mechanism, a spring is compressed to store energy, and moving and static contacts are conducted to achieve closing of the circuit breaker. When a large current exceeding a set value passes through an electric loop, the overcurrent tripping device triggers to act, a tripping push rod in the overcurrent tripping device is driven by electromagnetic force and can move upwards to push a shifting fork, the shifting fork can be separated from a ratchet wheel to be matched with the ratchet wheel when moving upwards along with the tripping push rod, the tripping action direction corresponding to the overcurrent tripping action of the direct-current circuit breaker is provided at the moment, the ratchet wheel is separated from a clamping groove of the shifting fork, the conductive slide rod is not pushed by the shifting fork any more, and the spring mechanism releases energy to drive the conductive slide rod to move so as to realize the opening of the circuit breaker. When the large current disappears, the tripping push rod can be restored to the initial state under the action of the return spring. However, if the circuit breaker is forcibly switched on in an overcurrent tripping state, the large current passing through the circuit breaker can not only damage equipment, but also harm the personal safety of operators.
Disclosure of Invention
The invention aims to provide a self-locking device of a direct current circuit breaker, which can lock the circuit breaker after the circuit breaker is opened and can carry out switching-on operation only after the self-locking device is unlocked so as to solve the potential safety hazard of the circuit breaker in the prior art; another object of the present invention is to provide a dc circuit breaker, which can lock the circuit breaker after opening the circuit breaker and can perform a closing operation only after the self-locking device is unlocked, and thus is highly safe.
In order to achieve the purpose, the direct current breaker adopts the following technical scheme:
the direct current circuit breaker comprises a shifting fork used for transmitting closing operation force, wherein the shifting fork is provided with a closing action direction corresponding to the closing action of the direct current circuit breaker and a tripping action direction corresponding to the overcurrent tripping action of the direct current circuit breaker; the shift fork has dropout state and recovery state in dropout action direction, and direct current circuit breaker still is provided with self-lock device, self-lock device includes first locking piece and second locking piece, wherein: the first locking piece is arranged in the direct current circuit breaker in a guiding mode along the tripping action direction of the shifting fork, is in transmission connection with the shifting fork which transmits closing operation force in the direct current circuit breaker so as to synchronously act with the shifting fork, and is provided with a self-locking position corresponding to the tripping state of the shifting fork and an unlocking position corresponding to the recovery state of the shifting fork; the second locking piece is arranged in the direct current circuit breaker in a guiding mode, and the guiding movement direction of the second locking piece is perpendicular to the guiding movement direction of the first locking piece; one of the first locking piece and the second locking piece is provided with a locking pin, and the other locking piece is provided with a locking pin clamping inlet; a lock pin stopping edge is formed at the edge of the lock pin clamping inlet and used for sliding support of the lock pin when the first locking piece and the second locking piece move relatively along the tripping action direction of the shifting fork; the second locking piece is connected with a return spring which applies elastic acting force to the second locking piece so that the peripheral surface of the lock pin elastically pushes against the lock pin stopping edge; the locking pin clamping inlet is used for clamping the locking pin when the first locking piece is in the self-locking position so as to prevent the first locking piece from moving to the unlocking position; the self-locking device of the direct current circuit breaker is also provided with an unlocking piece which is used for pushing the second locking piece to overcome the acting force of the reset spring to act so as to separate the lock pin from the lock pin clamping opening.
The beneficial effects are that: the self-locking device comprises a first locking piece and a second locking piece which can be arranged in a guiding mode and can be locked with each other, the first locking piece is in transmission connection with the shifting fork, the first locking piece is connected with the shifting fork through a connecting structure or enables the shifting fork to be abutted against the first locking piece, and the arrangement mode can be determined according to working conditions; the first locking piece can move to the self-locking position along the tripping action direction of the shifting fork when the shifting fork is in a tripping state, the first locking piece in the self-locking position can limit the shifting fork to reset through matching with the second locking piece, the shifting fork cannot provide closing operation force for the direct current circuit breaker after being limited, thereby realizing the purpose of locking the circuit breaker to ensure that the circuit breaker cannot be closed, the self-locking device provides guarantee for equipment safety and personal safety of operators, the safety of the direct current circuit breaker is directly improved, and the first locking piece and the second locking piece are matched through the locking pin and the locking pin clamping opening, locking and unlocking are simple, only the locking pin is withdrawn from the locking pin clamping opening to unlock the self-locking device, and the structure is simple.
Furthermore, a slot is formed in the side edge of one of the first locking piece and the second locking piece, a lock pin arranged on the other of the first locking piece and the second locking piece is clamped in the slot, the inner wall of the slot is matched with the lock pin in a blocking mode to enable the first locking piece to be in a self-locking position, and the slot forms the lock pin clamping inlet.
The beneficial effects are that: the slot for the locking pin to be clamped from one side is used as the locking pin clamping inlet, so that the structure is simple and the processing is convenient.
Furthermore, be provided with the fixing base that supplies the direction setting of first locking piece among the self-lock device, first locking piece is the plate body structure, is provided with the locating pin of following first locking piece direction of motion interval arrangement on the fixing base, is provided with the slot hole that supplies the locating pin to pass on the first locking piece, and the locating pin is in order to guide the direction removal of first locking piece with the pore wall direction cooperation of slot hole.
The beneficial effects are that: the first locking piece is guided to act by the matching of the positioning pin and the long hole, the technology is mature, and the structure is simple.
Furthermore, an unlocking plate is movably arranged in the self-locking device and is perpendicular to the direction of guiding movement of the second locking piece, the unlocking plate is provided with a pushing inclined plane which pushes the second locking piece to move so as to enable the lock pin to be separated from the lock pin clamping opening in a matched mode, and the unlocking plate forms an unlocking piece.
The beneficial effects are that: the pushing inclined plane is used to drive the second locking piece to move, and the second locking piece can gradually move along the pushing inclined plane, so that the action is stable.
Furthermore, a manual locking mechanism for pushing the first locking piece to the self-locking position under manual operation is further arranged in the self-locking device.
The beneficial effects are that: the manual locking mechanism is added in the self-locking device, so that an operator can actively lock the circuit breaker, the working condition that the direct-current circuit breaker can be used is increased, and the applicability is improved.
In order to achieve the purpose, the self-locking device of the direct current circuit breaker adopts the following technical scheme:
direct current circuit breaker's self-lock device, its characterized in that: including first locking piece and second locking piece, wherein: the first locking piece is arranged on the corresponding fixed seat in a guiding manner, is used for being in transmission connection with a shifting fork for transmitting closing operation force in the direct-current circuit breaker so as to synchronously act with the shifting fork along the tripping action direction of the shifting fork, and is provided with a self-locking position corresponding to the tripping state of the shifting fork and an unlocking position corresponding to the recovery state of the shifting fork; the second locking piece is arranged on the corresponding fixed seat in a guiding mode, and the guiding movement direction of the second locking piece is perpendicular to the guiding movement direction of the first locking piece; one of the first locking piece and the second locking piece is provided with a locking pin, and the other locking piece is provided with a locking pin clamping inlet; a lock pin stopping edge is formed at the edge of the lock pin clamping inlet and used for sliding support of the lock pin when the first locking piece and the second locking piece move relatively along the tripping action direction of the shifting fork; the second locking piece is connected with a return spring which applies elastic acting force to the second locking piece so that the peripheral surface of the lock pin elastically pushes against the lock pin stopping edge; the locking pin clamping inlet is used for clamping the locking pin when the first locking piece is in the self-locking position so as to prevent the first locking piece from moving to the unlocking position; the self-locking device of the direct current circuit breaker is also provided with an unlocking piece which is used for pushing the second locking piece to overcome the acting force of the reset spring to act so as to separate the lock pin from the lock pin clamping opening.
The beneficial effects are that: the self-locking device comprises a first locking piece and a second locking piece which can be arranged in a guiding mode and can be locked with each other, the first locking piece is in transmission connection with the shifting fork, the first locking piece is connected with the shifting fork through a connecting structure or enables the shifting fork to be abutted against the first locking piece, and the arrangement mode can be determined according to working conditions; the first locking piece can move to the self-locking position along the tripping action direction of the shifting fork when the shifting fork is in a tripping state, the first locking piece in the self-locking position can limit the shifting fork to reset through matching with the second locking piece, the shifting fork cannot provide closing operation force for the direct current circuit breaker after being limited, thereby realizing the purpose of locking the circuit breaker to ensure that the circuit breaker cannot be closed, the self-locking device provides guarantee for equipment safety and personal safety of operators, the safety of the direct current circuit breaker is directly improved, and the first locking piece and the second locking piece are matched through the locking pin and the locking pin clamping opening, locking and unlocking are simple, only the locking pin is withdrawn from the locking pin clamping opening to unlock the self-locking device, and the structure is simple.
Furthermore, a slot is formed in the side edge of one of the first locking piece and the second locking piece, a lock pin arranged on the other of the first locking piece and the second locking piece is clamped in the slot, the inner wall of the slot is matched with the lock pin in a blocking mode to enable the first locking piece to be in a self-locking position, and the slot forms the lock pin clamping inlet.
The beneficial effects are that: the slot for the locking pin to be clamped from one side is used as the locking pin clamping inlet, so that the structure is simple and the processing is convenient.
Furthermore, the first locking piece is of a plate structure, the fixing seat is provided with positioning pins which are arranged at intervals along the movement direction of the first locking piece, the first locking piece is provided with a long hole for the positioning pin to penetrate through, and the positioning pin is matched with the hole wall of the long hole in a guiding mode to guide the first locking piece to move in a guiding mode.
The beneficial effects are that: the first locking piece is guided to act by the matching of the positioning pin and the long hole, the technology is mature, and the structure is simple.
Furthermore, an unlocking plate is movably arranged in the self-locking device and is perpendicular to the direction of guiding movement of the second locking piece, the unlocking plate is provided with a pushing inclined plane which pushes the second locking piece to move so as to enable the lock pin to be separated from the lock pin clamping opening in a matched mode, and the unlocking plate forms an unlocking piece.
The beneficial effects are that: the pushing inclined plane is used to drive the second locking piece to move, and the second locking piece can gradually move along the pushing inclined plane, so that the action is stable.
Furthermore, a manual locking mechanism for pushing the first locking piece to the self-locking position under manual operation is further arranged in the self-locking device.
The beneficial effects are that: the manual locking mechanism is added in the self-locking device, so that an operator can actively lock the circuit breaker, the working condition that the direct-current circuit breaker can be used is increased, and the applicability is improved.
Drawings
Fig. 1 is a schematic view of a matching structure of a moving contact portion and a fixed contact portion with a self-locking device in an embodiment 1 of a dc circuit breaker according to the present invention;
fig. 2 is a schematic structural view of a self-locking device in embodiment 1 of the dc circuit breaker of the present invention;
fig. 3 is a first side view of the self-locking device in embodiment 1 of the dc circuit breaker of the present invention;
fig. 4 is a second side view of the self-locking device in embodiment 1 of the dc circuit breaker of the present invention;
in the figure: 10-a first fixing plate; 11-a first locator pin; 12-a second locating pin; 20-self-locking plate; 21-slotting; 22-a first slot; 23-a connecting plate; 30-a latch plate; 31-a latch plate roller; 32-second slot; 33-a locking pin; 34-self-locking plate rollers; 40-a shift fork push rod; 41-moving contact; 411-a lock block; 42-a stationary contact; 43-a shifting fork; 431-locking buckle; 44-bus bar; 45-stationary core; 46-a movable iron core; 47-inclined air gap; 50-manually locking the plate; 60-a third fixing plate; 61-folding edges; 70-unlocking plate; 80-a second fixing plate; 91-a reset tension spring; 92-an unlocking spring; 93-upper lock plate spring; 94-return spring.
Detailed Description
The present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1, embodiment 1 of the dc circuit breaker of the present invention: the direct current circuit breaker is a high-capacity direct current air circuit breaker and is used in the field of rail transit. The main structure of the dc circuit breaker will now be described with reference to fig. 1: the contact system of the direct current circuit breaker mainly comprises a busbar 44, a movable contact 41 capable of swinging is hinged to the end portion of the busbar 44, a fixed contact 42 is arranged on the side of the movable contact 41, and the movable contact 41 swings towards the fixed contact 42 to realize closing. The direct current circuit breaker is also provided with a driving device for driving the movable contact to swing, the driving device is provided with a shifting fork 43 matched with the movable contact 41, the side surface of the shifting fork 43 is provided with a lock 431, and the side surface of the movable contact 41 is provided with a lock block 411 matched with the lock 431. When the shifting fork 43 moves towards the right, the locking bar 431 abuts against the locking block 411 on the side surface of the movable contact 41, and the movable contact 41 is driven to swing towards the fixed contact 42 so as to realize closing. When the shifting fork 43 is in the extended state, the lock 431 is always engaged with the lock block 411 to keep the moving contact 41 in contact with the stationary contact 42, and the shifting fork 43 in this state provides a closing operation force for the moving contact 41. When the shifting fork 43 moves towards the left, the movable contact 41 is separated from the fixed contact 42 under the action of the movable contact return spring to realize opening.
Besides, an overcurrent tripping device is further arranged in the direct current circuit breaker, the overcurrent tripping device comprises a static iron core 45 and a movable iron core 46 which are arranged at intervals along the horizontal direction, and a shifting fork push rod 40 arranged above the movable iron core 46, the static iron core 45 and the movable iron core 46 jointly enclose a square structure, and the busbar 44 penetrates through the square structure. An inclined air gap 47 is arranged between the static iron core 45 and the movable iron core 46, and one end of the inclined air gap 47 close to the movable iron core 46 is higher than one end of the inclined air gap 47 close to the static iron core 45. The movable iron core 46 and the static iron core 45 are formed by laminating silicon steel sheets, have good magnetic permeability, and after the movable contact 41 is connected with the static contact 42, current flows through the busbar 44, and the current in the busbar 44 generates a magnetic field which passes through the static iron core 45 and the movable iron core 46. When the current in the busbar 44 reaches the set value of the maximum current limiting, the electromagnetic attraction generated by the magnetic field on the two iron cores can enable the movable iron core 46 to overcome the elastic force of the return spring of the movable iron core and move towards the static iron core 45, and because the inclined air gap 47 is formed between the two iron cores, the opposite surfaces of the two iron cores are provided with inclined edges, the attraction of the static iron core 45 to the movable iron core 46 can enable the movable iron core 46 to horizontally move towards the static iron core 45 and can drive the movable iron core 46 to move upwards. The movable iron core 46 will contact the shift fork push rod 40 during the upward movement and push the shift fork push rod 40 to move upward. The shifting fork push rod 40 drives the shifting fork 43 to move, so that the locking buckle 431 on the shifting fork 43 is disengaged from the locking block 411 on the movable contact 41, and the movable contact 41 is not limited by the shifting fork 43 any more and is disengaged from the static contact 42. The direct current circuit breaker is also provided with a self-locking device, the circuit breaker can be locked after being opened, and the switching-on operation can be carried out only after the self-locking device is unlocked.
As shown in fig. 2, the self-locking device includes a first fixing plate 10 separately disposed in the circuit breaker as a fixing base, the first fixing plate 10 extends in the vertical direction, the self-locking device further includes a self-locking plate 20 disposed in parallel with the first fixing plate 10 and as a first locking member, two first positioning pins 11 disposed at intervals in the vertical direction are disposed on the first fixing plate 10, a first long hole 22 corresponding to the first positioning pin 11 is disposed on the self-locking plate 20, and the self-locking plate 20 can be guided and moved in the up-and-down direction relative to the first fixing plate 10 by the guide cooperation of the first positioning pin 11 and the first long hole 22. A space is provided between the first fixing plate 10 and the self-locking plate 20, a locking pin plate 30 as a second locking member is provided in the space, a second positioning pin 12 engaged with the locking pin plate 30 is also provided on the first fixing plate 10, a second long hole 32 engaged with the second positioning pin 12 in a guiding manner is provided on the locking pin plate 30, the second long hole 32 extends in a horizontal direction, and the locking pin plate 30 moves horizontally by engagement of the second positioning pin 12 and the second long hole 32.
As shown in fig. 3 and 4, the lower end of the main body of the self-locking plate 20 is provided with a connecting plate 23 perpendicular to the plane of the main body of the self-locking plate 20, a second fixing plate 80 fixed on the circuit breaker housing is arranged below the connecting plate 23 at an interval, a return tension spring 91 is arranged between the second fixing plate 80 and the self-locking plate 20, and the return tension spring 91 provides an acting force for driving the self-locking plate 20 to move downwards integrally. A return spring 94 is disposed on the first fixing plate 10 at a side opposite to the second positioning pin 12 in the horizontal direction, one end of the return spring 94 is connected to the first fixing plate 10, and the other end is connected to the latch plate 30, and the return spring 94 can provide an acting force for driving the latch plate 30 to move toward the self-locking plate 20.
The connecting plate 23 is connected to the return spring 91, and is also used to fix the shift fork push rod 40, and the shift fork push rod 40 is used as an input end, and moves up when receiving the electromagnetic force from the moving iron core, and drives the self-locking plate 20 to move upward against the elastic force of the return spring 94. When the current is large in the direct current circuit breaker, the overcurrent tripping device works, the shifting fork push rod 40 drives the shifting fork 43 to act, the shifting fork 43 has a corresponding tripping action direction, namely, the upward acting direction, the shifting fork 43 is in a tripping state when the lock catch 431 on the shifting fork 43 is separated from the lock catch 411 on the movable contact 41, when the current is stable and the shifting fork push rod 40 falls, the shifting fork 43 is not limited by the shifting fork push rod 40 any more, the shifting fork 43 can swing downwards under the action of a shifting fork reset spring, and the shifting fork 43 at the moment is in a restoring state.
The side edge of the self-locking plate 20 is provided with a slot 21 as a locking pin clamping inlet, the opening edge of the slot 21 forms a locking pin stopping edge, and the locking pin stopping edge is used for supporting the locking pin in a sliding manner when the self-locking plate 20 and the locking pin plate 30 move relatively along the releasing action direction of the shifting fork. The lock pin plate 30 is provided with a lock pin 33 with the axis vertical to the plate surface of the lock pin plate 30, the distance between the lock pin 33 on the lock pin plate 30 and the slot 21 is closer and closer in the process that the self-locking plate 20 moves upwards along with the shifting fork push rod 40, the lock pin 33 is always attached to the side edge of the self-locking plate 20 in the motion process of the self-locking plate 20 under the action of the return spring 94, and the lock pin plate 30 cannot move due to the blocking and matching of the lock pin 33 and the self-locking plate 20. When the lock pin 33 and the slot 21 reach the same height, the lock pin 33 and the side edge of the self-locking plate 20 are not stopped, the lock pin 33 enters the slot 21 along with the movement of the lock pin plate 30, at this time, the self-locking plate 20 is limited by the lock pin 33 to be in a self-locking position, the self-locking plate 20 cannot move, so that the shifting fork push rod 40 connected with the self-locking plate 20 is also stopped, the shifting fork push rod 40 jacks up the end part of the shifting fork 43, and the movable contact 41 is disconnected from the fixed contact 42. The shift fork 43 is placed above the shift fork pusher 40, and at this time, the shift fork 43 cannot provide a closing operation force, and the dc circuit breaker cannot perform a closing operation.
A lock pin plate roller 31 is provided at an end of the lock pin plate 30, the lock pin plate roller 31 is a cylinder, the rotation axis of the lock pin plate is parallel to the plane of the lock pin plate 30, the lock pin plate 30 is provided with a connecting arm extending outwards, and the roller 31 is rotatably fitted on the connecting arm, and a space is provided between the roller 31 and the corresponding side of the first fixing plate 10, and an unlocking plate 70 for cooperating with the roller 31 to move the latch plate 30 away from the self-locking plate 20 against the urging force of the return spring 94 is disposed in the space, the unlocking plate 70 serving as an unlocking member, the plate surface is arranged along the horizontal direction, the side edge of the unlocking plate 70 corresponding to the roller 31 is provided with an inclined part for pushing the locking plate roller 31 and the locking plate 30 to act, the width of the plate body at the side of the inclined part close to the locking plate roller 31 is smaller than that at the side far away from the locking plate roller 31, and the inclined part forms a pushing inclined surface corresponding to the peripheral surface of the locking plate roller 31. The unlocking plate 70 is provided with a third fixing plate 60 in front of the unlocking movement direction, an unlocking spring 92 is arranged between the third fixing plate 60 and the end part of the unlocking plate 70, and the unlocking spring 92 can provide elastic force for driving the unlocking plate 70 to move so as to enable the pushing inclined plane to be far away from the lock pin plate roller 31.
An operator pushes the unlocking plate 70, the unlocking plate 70 is matched with the locking pin plate roller 31 through an inclined part on the side edge of the unlocking plate 70 to drive the locking pin plate 30 to be far away from the self-locking plate 20, the locking pin 33 on the locking pin plate 30 is withdrawn from the slot 21 on the self-locking plate 20, the self-locking plate 20 is in an unlocking position at the moment and is not limited by the locking pin 33, the locking pin moves downwards under the action of the reset tension spring 91, the shifting fork push rod 40 is separated from the shifting fork 43 in the process of moving along with the self-locking plate 20, after the shifting fork 43 is reset, the lock catch 430 on the shifting fork 43 can be aligned with the lock block 411 on the moving contact 41, and the shifting fork 43 is horizontally pushed at the moment to drive the moving contact 41 to swing towards the static contact 42, so that closing is realized.
Specifically, the connecting plate 23 is provided with a shaft body, the shaft body is sleeved with a roller bearing forming the self-locking plate roller 34, and an outer ring of the roller bearing can rotate freely. The manual locking plate 50 is arranged below the self-locking plate roller 34, the manual locking plate 50 is arranged in a mode that the plate surface is parallel to the vertical direction, a folded edge 61 is arranged on a third fixing plate 60 in the self-locking device, a guide hole for enabling the end part of the manual locking plate 50 to penetrate through and guiding the manual locking plate 50 to move is formed in the folded edge 61, the manual locking plate 50 can only be movably arranged along the horizontal direction, and the side edge of the manual locking plate 50 corresponding to the self-locking plate roller 34 is an inclined edge and is always tightly attached to the self-locking plate roller 34. When the manual locking plate 50 moves, the self-locking plate roller 34 can be pushed up by the inclined edge, so that the self-locking plate roller 34 drives the self-locking plate 20 and the shifting fork push rod 40 to move upwards, and the self-locking plate 20 is locked by the lock pin 33. An upper lock plate spring 93 for resetting the manual upper lock plate 50 is arranged between the end part of the manual upper lock plate 50 and a shaft body on the connecting plate 23, a folded edge 61 is arranged on the third fixing plate 60, a guide hole for allowing the end part of the manual upper lock plate 50 to pass through and guiding the manual upper lock plate 50 to act is arranged on the folded edge 61, and the manual upper lock plate 50 and the self-lock plate roller 34 correspondingly form a manual upper lock mechanism for allowing an operator to manually operate to realize self-locking of the direct current circuit breaker.
When the direct current circuit breaker is tripped due to overcurrent or is manually and emergently opened, the magnetic field intensity of large current in the busbar 44 on the static iron core 45 and the movable iron core 46 is increased, the electromagnetic attraction between the movable iron core 46 and the static iron core 45 is greater than the elastic force of a movable iron core reset spring, the movable iron core 46 moves obliquely upwards close to the static iron core 45, the shifting fork push rod 40 is driven to move upwards in the process that the movable iron core 46 rises, and the shifting fork push rod 40 drives the self-locking plate 20 to move upwards by overcoming the elastic force of the reset tension spring 91 through the connecting plate 23 when moving. The vertical distance between the lock pin 33 on the lock pin plate 30 and the slot 21 on the self-locking plate 20 is closer and closer until the lock pin 33 enters the slot 21 as a lock pin clamping entrance, at which time the self-locking plate 20 cannot move upwards any more due to the limitation of the lock pin 33. The shifting fork push rod 40 pushes up the shifting fork 43 in the upward moving process, and the shifting fork 43 can synchronously move along with the shifting fork push rod 40 and the self-locking plate 20 and swing downwards and upwards under the pushing action of the shifting fork push rod 40. After the shifting fork 43 swings, the lock 431 is disengaged from the lock block 411, the movable contact 41 is disengaged from the fixed contact 42 under the action of the movable contact return spring, the movable contact 41 loses the closing operation force provided by the shifting fork 43, and the circuit breaker is in an opening state. Meanwhile, the position of the shifting fork push rod 40 is locked by the self-locking plate 20, so that the shifting fork 43 is in a tripping state, the lock 431 on the shifting fork 43 is disengaged from the lock block 411 on the moving contact 41, the moving contact 41 cannot be driven to swing by the shifting fork 43, and the direct current circuit breaker cannot perform closing operation.
When the closing operation is required, the locking of the self-locking device to the shifting fork should be firstly released, the operator pushes the unlocking plate 70, the unlocking plate 70 is matched with the locking pin plate roller 31 through the inclined part of the side edge of the unlocking plate 70 to drive the locking pin plate 30 to be far away from the self-locking plate 20 in the horizontal direction, the locking pin 33 on the locking pin plate 30 is withdrawn from the notch 21 on the self-locking plate 20, at the moment, the movement of the self-locking plate 20 in the vertical direction is not limited by the locking pin 33 any more, the elastic force provided by the reset tension spring 91 downwards moves the self-locking plate 20, and the shifting fork push rod 40 is separated from the shifting fork 43 in the process of moving along with the self-locking plate 20, the shifting fork 43 is not limited by the shifting fork push rod 40 any more, the lock 431 on the shifting fork 43 after resetting is aligned with the lock block 411 of the movable contact 41, the shifting fork 43 is horizontally pushed to enable the shifting fork 43 to drive the movable contact 41 to swing to realize closing, and the operator can perform closing operation at the moment.
If an operator needs to actively lock the direct current circuit breaker, the manual locking plate 50 can be pushed, the inclined edge of the manual locking plate 50 can also push the self-locking plate roller 32 in the process of the direct movement of the manual locking plate 50 to lift the self-locking plate 20, the self-locking plate 20 moves upwards against the acting force of the reset tension spring 91, the slot 21 serving as a locking pin clamping inlet is in locking fit with the locking pin 33, the shifting fork push rod 40 pushes up the shifting fork 43 in the process of moving upwards to enable the shifting fork 43 to swing upwards, after the shifting fork 43 swings, the locking buckle 431 is disengaged from the locking block 411, the movable contact 41 is disengaged from the fixed contact 42 under the action of the movable contact reset spring, the movable contact 41 loses the closing operation force provided by the shifting fork 43, and the circuit breaker is in a switching-off state. Meanwhile, the position of the shifting fork push rod 40 is locked by the self-locking plate 20, so that the shifting fork 43 is in a tripping state, the lock 431 on the shifting fork 43 is disengaged from the lock block 411 on the moving contact 41, the moving contact 41 cannot be driven to swing by the shifting fork 43, and the direct current circuit breaker cannot perform closing operation.
Embodiment 2 of the direct current breaker of the present invention: the contact part matched with the self-locking device in the direct current circuit breaker can also adopt other forms, for example, the internal arrangement mode of the direct current circuit breaker disclosed in the patent application document with the application publication number of CN107706043A is adopted, a conductive sliding rod is assembled in the direct current circuit breaker in a guiding way, one end of the conductive sliding rod is connected with a movable contact, the other end of the conductive sliding rod is provided with a ratchet wheel, the shifting fork can push the ratchet wheel to move when moving towards a conductive push rod, and the ratchet wheel drives the conductive push rod to move so as to enable the movable contact to be contacted with a fixed contact, thereby realizing closing. A shifting fork push rod in the tripping and closing device is arranged below a shifting fork and is controlled by electromagnetic force, when overlarge current or manual emergency opening occurs in the circuit breaker, the electromagnetic force is generated to enable the shifting fork push rod to move upwards, the shifting fork push rod pushes the shifting fork to enable the shifting fork to be separated from a ratchet wheel, a moving contact is separated from a static contact under the action of a reset spring to achieve opening, meanwhile, the shifting fork push rod is connected to a self-locking plate of the self-locking device, the shifting fork push rod moves upwards to drive the self-locking plate to move upwards, a lock pin on the lock pin plate is clamped into an opening serving as a lock pin clamping inlet, the position of the shifting fork push rod is locked by the self-locking device, the shifting fork is lapped on the shifting fork push rod at the moment and cannot be matched with the ratchet wheel on the conductive slide rod, and the direct-current circuit breaker cannot be closed when the shifting fork push rod is locked. After the self-locking device is unlocked, the shifting fork push rod falls, the shifting fork is matched with the ratchet wheel again, and at the moment, an operator can drive the shifting fork to horizontally move to drive the moving contact to be in contact with the fixed contact, so that closing operation is completed.
In other embodiments, the structure of the first locking element may take other forms, for example, a rod body is used as the first locking element, a locking pin clamping inlet matched with the second locking element is arranged on the rod body, a locking pin matched with the locking pin clamping inlet is arranged on the second locking element, and the shifting fork can be limited by the outer circumferential surface of the rod body when the first locking element moves; a block-like structure may also be used as the first locking member.
In embodiment 2, the shift fork is taken on the shift fork push rod, does not set up connection structure between the two, in other embodiments, can be provided with the slot hole on the shift fork push rod, and the shift fork passes through the slot hole and articulates on the shift fork push rod, can drive the shift fork action and spacing the shift fork during the shift fork push rod action, the shift fork also can realize accomplishing the branch combined floodgate action through the relative motion of slot hole and shift fork push rod.
In the above embodiments 1 and 2, the fixing seat for installing the first locking member is separately provided, and in other embodiments, the fixing seat for installing the locking member may be made by using a housing of the dc circuit breaker, a plate body of another mechanism, or other structural members, instead of separately providing the fixing seat.
In other embodiments, the guide structure for guiding the first locking member and the second locking member to move may be replaced by a rail, and the first locking member and the second locking member are disposed on the rail to realize the guiding movement.
In other embodiments, the operator can directly push the manual locking plate to move or directly pull the manual locking plate to move, and a driving mechanism for driving the manual locking plate to move is not provided.
The self-locking device of the direct current circuit breaker has the same structure and effect as those of the self-locking device in the embodiment of the direct current circuit breaker, so the embodiment of the self-locking device of the direct current circuit breaker is not repeated.
The above-mentioned embodiments, the objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The direct current circuit breaker comprises a shifting fork used for transmitting closing operation force, wherein the shifting fork is provided with a closing action direction corresponding to the closing action of the direct current circuit breaker and a tripping action direction corresponding to the overcurrent tripping action of the direct current circuit breaker; the shift fork has dropout state and recovery state, its characterized in that in dropout action direction:
the direct current circuit breaker still is provided with self-lock device, self-lock device includes first locking piece and second locking piece, wherein:
the first locking piece is arranged in the direct current circuit breaker in a guiding mode along the tripping action direction of the shifting fork, is in transmission connection with the shifting fork which transmits closing operation force in the direct current circuit breaker so as to synchronously act with the shifting fork, and is provided with a self-locking position corresponding to the tripping state of the shifting fork and an unlocking position corresponding to the recovery state of the shifting fork;
the second locking piece is arranged in the direct current circuit breaker in a guiding mode, and the guiding movement direction of the second locking piece is perpendicular to the guiding movement direction of the first locking piece;
one of the first locking piece and the second locking piece is provided with a locking pin, and the other locking piece is provided with a locking pin clamping inlet;
a lock pin stopping edge is formed at the edge of the lock pin clamping inlet and used for sliding support of the lock pin when the first locking piece and the second locking piece move relatively along the tripping action direction of the shifting fork; the second locking piece is connected with a return spring which applies elastic acting force to the second locking piece so that the peripheral surface of the lock pin elastically pushes against the lock pin stopping edge;
the locking pin clamping inlet is used for clamping the locking pin when the first locking piece is in the self-locking position so as to prevent the first locking piece from moving to the unlocking position;
the self-locking device of the direct current circuit breaker is also provided with an unlocking piece which is used for pushing the second locking piece to overcome the acting force of the reset spring to act so as to separate the lock pin from the lock pin clamping opening.
2. The direct current circuit breaker according to claim 1, characterized in that: the side edge of one of the first locking piece and the second locking piece is provided with a groove for the locking pin arranged on the other one of the first locking piece and the second locking piece to be clamped, the inner wall of the groove is in blocking fit with the locking pin so that the first locking piece is in a self-locking position, and the groove forms the locking pin clamping inlet.
3. The direct current circuit breaker according to claim 1 or 2, characterized in that: be provided with the fixing base that supplies the direction setting of first locking piece in the self-locking device, first locking piece is the plate body structure, is provided with the locating pin of following first locking piece direction of motion interval arrangement on the fixing base, is provided with the slot hole that supplies the locating pin to pass on the first locking piece, and the locating pin is in order to guide the first locking piece direction removal with the pore wall direction cooperation of slot hole.
4. The direct current circuit breaker according to claim 1 or 2, characterized in that: the self-locking device is internally provided with an unlocking plate which is movably arranged in a direction vertical to the guide movement direction of the second locking piece, the unlocking plate is provided with a pushing inclined plane which pushes the second locking piece to move so as to enable the lock pin to be separated from the lock pin clamping opening, and the unlocking plate forms an unlocking piece.
5. The direct current circuit breaker according to claim 1, characterized in that: the self-locking device is also provided with a manual locking mechanism for pushing the first locking piece to the self-locking position under manual operation.
6. Direct current circuit breaker's self-lock device, its characterized in that:
including first locking piece and second locking piece, wherein:
the first locking piece is arranged on the corresponding fixed seat in a guiding manner, is used for being in transmission connection with a shifting fork for transmitting closing operation force in the direct-current circuit breaker so as to synchronously act with the shifting fork along the tripping action direction of the shifting fork, and is provided with a self-locking position corresponding to the tripping state of the shifting fork and an unlocking position corresponding to the recovery state of the shifting fork;
the second locking piece is arranged on the corresponding fixed seat in a guiding mode, and the guiding movement direction of the second locking piece is perpendicular to the guiding movement direction of the first locking piece;
one of the first locking piece and the second locking piece is provided with a locking pin, and the other locking piece is provided with a locking pin clamping inlet;
a lock pin stopping edge is formed at the edge of the lock pin clamping inlet and used for sliding support of the lock pin when the first locking piece and the second locking piece move relatively along the tripping action direction of the shifting fork; the second locking piece is connected with a return spring which applies elastic acting force to the second locking piece so that the peripheral surface of the lock pin elastically pushes against the lock pin stopping edge;
the locking pin clamping inlet is used for clamping the locking pin when the first locking piece is in the self-locking position so as to prevent the first locking piece from moving to the unlocking position;
the self-locking device of the direct current circuit breaker is also provided with an unlocking piece which is used for pushing the second locking piece to overcome the acting force of the reset spring to act so as to separate the lock pin from the lock pin clamping opening.
7. The self-locking device of a direct current circuit breaker according to claim 6, characterized in that: the side edge of one of the first locking piece and the second locking piece is provided with a groove for the locking pin arranged on the other one of the first locking piece and the second locking piece to be clamped, the inner wall of the groove is in blocking fit with the locking pin so that the first locking piece is in a self-locking position, and the groove forms the locking pin clamping inlet.
8. The self-locking device of a direct current circuit breaker according to claim 6 or 7, characterized in that: the first locking piece is of a plate structure, the fixing seat is provided with positioning pins which are arranged at intervals along the movement direction of the first locking piece, the first locking piece is provided with a long hole for the positioning pin to penetrate through, and the positioning pin is matched with the hole wall of the long hole in a guiding mode to guide the first locking piece to move in a guiding mode.
9. The self-locking device of a direct current circuit breaker according to claim 6 or 7, characterized in that: the self-locking device is internally provided with an unlocking plate which is movably arranged in a direction vertical to the guide movement direction of the second locking piece, the unlocking plate is provided with a pushing inclined plane which pushes the second locking piece to move so as to enable the lock pin to be separated from the lock pin clamping opening, and the unlocking plate forms an unlocking piece.
10. The self-locking device of a direct current circuit breaker according to claim 6, characterized in that: the self-locking device is also provided with a manual locking mechanism for pushing the first locking piece to the self-locking position under manual operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889160.9A CN110931317B (en) | 2019-09-19 | 2019-09-19 | Direct current circuit breaker and self-locking device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889160.9A CN110931317B (en) | 2019-09-19 | 2019-09-19 | Direct current circuit breaker and self-locking device thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN110931317A CN110931317A (en) | 2020-03-27 |
| CN110931317B true CN110931317B (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910889160.9A Active CN110931317B (en) | 2019-09-19 | 2019-09-19 | Direct current circuit breaker and self-locking device thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111968891B (en) * | 2020-08-17 | 2022-11-04 | 浙江思创电力科技股份有限公司 | Locking device and circuit breaker |
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| EP0300270A1 (en) * | 1987-07-22 | 1989-01-25 | BBC Brown Boveri AG | Latch arrangement for a high-speed circuit breaker |
| US6242703B1 (en) * | 1998-01-14 | 2001-06-05 | General Electric Company | Bell alarm with automatic reset for small frame air circuit breaker |
| CN201199511Y (en) * | 2008-05-16 | 2009-02-25 | 常熟开关制造有限公司(原常熟开关厂） | Trip locking safety device for circuit breaker |
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| CN107452530A (en) * | 2017-09-15 | 2017-12-08 | 无锡新宏泰电器科技股份有限公司 | A kind of circuit breaker switching-off locking device |
| CN208061939U (en) * | 2018-03-30 | 2018-11-06 | 福建中能电气有限公司 | A kind of breaker open operation blocking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0300270A1 (en) * | 1987-07-22 | 1989-01-25 | BBC Brown Boveri AG | Latch arrangement for a high-speed circuit breaker |
| US6242703B1 (en) * | 1998-01-14 | 2001-06-05 | General Electric Company | Bell alarm with automatic reset for small frame air circuit breaker |
| CN201199511Y (en) * | 2008-05-16 | 2009-02-25 | 常熟开关制造有限公司(原常熟开关厂） | Trip locking safety device for circuit breaker |
| CN203871286U (en) * | 2014-06-12 | 2014-10-08 | 谢忠夫 | Opening and locking device of air circuit breaker |
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| CN110931317A (en) | 2020-03-27 |
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