CN202373516U - Double-opening-speed permanent-magnet operation mechanism - Google Patents
Double-opening-speed permanent-magnet operation mechanism Download PDFInfo
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- CN202373516U CN202373516U CN2011204628929U CN201120462892U CN202373516U CN 202373516 U CN202373516 U CN 202373516U CN 2011204628929 U CN2011204628929 U CN 2011204628929U CN 201120462892 U CN201120462892 U CN 201120462892U CN 202373516 U CN202373516 U CN 202373516U
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Abstract
The utility model discloses a double-opening-speed permanent-magnet operation mechanism. The double-opening-speed permanent-magnet operation mechanism comprises a permanent-magnet iron core, an exciting coil and an opening speed reduction coil, wherein the exciting coil is used for generating magnetic field force and driving the permanent-magnet iron core to move to the closing direction and the opening direction, the upper end of the permanent-magnet iron core is connected with an opening spring, the lower end of the permanent-magnet iron core is connected with an opening-closing driving rod, the opening speed reduction coil is used for generating a magnetic field force so as to prevent the permanent-magnet iron core from moving to the opening direction, so that the action of the opening spring is decelerated. The high-speed opening impaction of an iron core of a permanent magnet bonded with rubidium, ferrum and boron is changed to the low-speed opening impaction due to the low opening speed, the brittle rubidium-ferrum-boron permanent magnet material is protected substantially due to the low impaction speed, meanwhile, the speed of the stretching suffered by a corrugated pipe of a vacuum pipe slows down due to the low opening speed, the opening overshoot of a whole circuit breaker is overcome, the tensile deformation of the corrugated pipe is protected, and the mechanical lives of the vacuum pipe and the circuit breaker can be prolonged substantially.
Description
Technical field
The utility model relates to the operating mechanism of vacuum circuit-breaker, relates in particular to a kind of pair of opening velocity permanent-magnet manipulating mechanism.
Background technology
Since 1961 succeeded in developing first vacuum circuit-breaker, the technical merit of vacuum circuit-breaker was improved rapidly.Along with the development of vacuum tube novel contact configurations and new material, the connecting-disconnecting function of vacuum circuit-breaker constantly promotes, and electric life increases greatly.Vacuum circuit-breaker is applied to electric power system more and more widely as the switch of controlling and distribute electric energy to use, and is keeping leading position in middle pressure field.
Key property of high-voltage switch gear is exactly a reliability; Show in the fault statistics of operation power and experiment station; The distinct issues of China's high-voltage switch gear are exactly machinery and Insulation Problems; This is comparatively backward compared with developed countries, the advanced company in developed country, and all numerous and confused now proposition is also released the non-maintaining electric equipment products of a new generation.China's high voltage switchgear will accomplish really that product is non-maintaining still very difficult.In fact, simplified structure as much as possible in product design, helpful to improving reliability of products.Whole missions of circuit breaker; Be the branch that is embodied in contact after all, close action; Realize through operating mechanism and divide, close action, so the quality of the service behaviour of operating mechanism and quality, play a part very important the service behaviour and the reliability of primary cut-out.And, also gone through the development of several generations as main element---the operating mechanism of vacuum circuit-breaker.From initial electromagnetic mechanism, develop into the spring operating mechanism of present extensive use, and present stage the permanent-magnet operating mechanism ripe and that popularize gradually of just marching toward.
Electromagnetic mechanism the earliest, because harsh to power requirement---need special-purpose big capacity power source screen power supply, and impact during operation greatly, the operating time is long, and is eliminated by market gradually, the substitute is spring operating mechanism.
The spring operating mechanism principle is to make the combined floodgate spring in the operating mechanism be compressed to the energy storage state through external force (hand rotation crank or use universal motor); This time; The combined floodgate spring has stored enough energy, and is buckled mechanism's pinning at this energy storage state by mechanism.When needing to close a floodgate; Press switch knob or make the closing coil action make mechanism buckle mechanism's dropout with hand with the signal of telecommunication; Thereby mechanism discharges the power of combined floodgate spring storage is closing a floodgate switch in a flash; In making process, sluice separating spring also is stretched simultaneously and has laid in enough strength separating brake when needing with preparation.Also need buckle mechanism and make mechanism when closing position fasten mechanism for preventing switch one separating brake again that closes a floodgate immediately this time, and sluice separating spring is released energy.Switch just is in "on" position always.When needing separating brake, press opening button or make switching winding action make the switch operating mechanism thread off, make switch at separating brake in a flash thereby mechanism discharges power that sluice separating spring stores with the signal of telecommunication with hand.This spring operating mechanism it utilize universal motor that spring is carried out energy pre-storage, utilizes spring can carry out breaking-closing operating, thereby low to power requirement, alternating current-direct current all can be operated, and power supply is not had impact, therefore had been used widely in recent years.
Permanent magnet mechanism adopts a kind of brand-new operation principle and structure, mainly divides two kinds of Monostable permanent magnetic mechanism and bistable-state permanent magnet mechanisms according to its principle and structure.So-called bistable-state permanent magnet mechanism refers at the end that closes a floodgate, separating brake end and all adopts permanent magnet to keep, and the action that divides, closes a floodgate is to drive moving iron core through two magnetizing coil energisings respectively to accomplish.Be characterized in simple in structure, good reliability.But bistable-state permanent magnet mechanism can't be realized manual brake separating.Even after adding man-operating mechanism and making its stable position of break away from closing a floodgate, can not be with opening velocity to the separating brake position, but relevant with manpower (the perhaps strength of exterior portions brake mechanism).Switch often can not reach the opening velocity that needs and test failure when needs cut-off short circuit current like this.Therefore the engineer develops Monostable permanent magnetic mechanism again on this basis.So-called Monostable permanent magnetic mechanism; Referring at the end that closes a floodgate adopts permanent magnet to keep; Then adopt spring to keep at the separating brake end; Feed motion is to drive moving iron core through the energising of combined floodgate magnetizing coil to accomplish, and in the process of closing a floodgate, separating brake is kept spring energy-storage simultaneously, and the separating brake action is to keep spring to accomplish by discharging separating brake.Advantage: because the action of the separating brake of Monostable permanent magnetic mechanism is to accomplish by tripping spring, so the just-off speed of its separating brake and average mark lock speed is superior to bistable-state permanent magnet mechanism, can better mate with the separating brake spring load characteristic curve of circuit breaker.In addition, this Monostable permanent magnetic mechanism with sluice separating spring can be realized the manual emergency separating brake.After manpower made it break away from closing position, tripping spring provided enough opening velocities, makes its reliable separating brake.
Research shows, the failure rate of switchgear is directly proportional with the quantity of its part, the structure more complicated of spring operating mechanism, and number of parts many (being about about 200) requires that machining accuracy is high, manufacturing process is complicated, and cost is high, and reliability of products is difficult for assurance.Compare with the conventional spring operating mechanism of circuit breaker; The part count of permanent magnet mechanism has reduced 70%; Complicated mechanical snap close and tripping system have been cancelled; Thereby have irreplaceable advantage: fault is few, reliable, the life-span long (can reach more than several ten thousand times), need not to lubricate, and is highly suitable for the ask for something reliability is high, operation is frequent occasion such as power supply, colliery, steel-making, railway etc.Therefore, permanent-magnet structure is used fast in recent years and is developed.
Although permanent magnet mechanism can make the vacuum circuit-breaker life-span be increased to more than several ten thousand times, but still can not satisfy some to requiring higher field mechanical endurance.These fields are such as electric railway, per 50 kilometers transmission & distribution power stations, and motor-car is going to next supply station; Shift to an earlier date cut-off breaker, slide to next supply station, get into this supply station after; Close a floodgate immediately, obtain the electric power energy, make the dynamic operation of EMUs from this supply station.When finishing, need shift to an earlier date cut-off breaker in this supply station distance travelled again, close a floodgate again after getting into next supply station, go round and begin again, every day is separating brake, combined floodgate repeatedly, separating brake, combined floodgate.So, even the permanent-magnet breaker that uses is now also finished using several ten thousand mechanical enduranves very soon, need safeguard circuit breaker, change permanent magnet mechanism and vacuum tube.
Why to change permanent magnet mechanism when safeguarding? This is because its iron core of permanent magnet mechanism of existing structure generally is as matrix by mild steel; With PU glue bond rubidium iron boron permanent magnet, it is whole to make rubidium iron boron permanent magnet and mild steel form the iron core with certain mechanical strength and enough suction at this mild steel circumference.Enough suction makes this iron core that enough repulsive forces of making every effort to overcome clothes contact stage clip and air lock spring can be arranged and has enough remaining forces to remain on closing position.Certain mechanical strength can so that iron core not by switch close a floodgate, bump damages during separating brake.This repeatedly high-speed impact can cause the vibrations of rubidium iron boron permanent magnet broken, loses enough suction, because rubidium iron boron permanent magnet is a kind of fragility magnetite.
Why to change vacuum tube when safeguarding? During frequent machinery folding, the bellows in the vacuum tube wherein can receive and stretch fast and compress, so generally can only reach 20,000 the mechanical endurance of vacuum tube.If breaker open operation buffer design or improper use, overshoot meeting that circuit breaker produces when separating brake strengthens the bellows amount of being stretched and strengthens, and life-span of bellows is produced harmful effect more.
Existing circuit breaker all is that the requirement circuit breaker can close and runs disconnected short circuit current jointly, and circuit breaker must have than higher divide-shut brake speed like this.Such as a rated voltage 12KV; Rated current 1250A; The vacuum circuit-breaker of rated short circuit drop-out current 31.5KA is wanted to cut-off the short circuit current (31.5KA) greater than 25 times of rated current (1250A), and the speed of circuit breaker must be in this scope: closing speed 0.6-1.0m/s; Opening velocity 0.8-1.2m/s.Be lower than this speed, possibly when cut-offfing rated short circuit current, cut-off failure.So design wants during breaker mechanism assurance mechanism can provide such divide-shut brake speed to circuit breaker.On such design starting point, the mechanical endurance of a vacuum circuit-breaker general maximum (not occurring under the unusual situation) just 20,000 times.Circuit breaker is when actual motion, and under the occasion of the numerous folding of picture frequency, what cut-off repeatedly is rated current rather than short circuit current, and rated current is 1/25 of a short circuit current.Short circuit current just just produces when breaking down in system's operation; This time control system can to find short circuit to occur unusual, relay needs action immediately, makes switch quick acting switching-off immediately; Otherwise distribution system will be burnt out or caused bigger loss, and this situation is more rare when normal operation.
So; If existing permanent magnet mechanism its mechanical endurance 20,000 times; Vacuum tube mechanical endurance 20,000 times, circuit breaker needs change permanent magnet mechanism and vacuum tube simultaneously after using these 20,000 mechanical enduranves, and this more is undoubtedly a pretty troublesome thing in the use field in multimachine tool life-span for needs.
Summary of the invention
To the shortcoming of prior art, the purpose of the utility model provides a kind of pair of opening velocity permanent-magnet manipulating mechanism, can on existing permanent magnet mechanism circuit-breaker basis, increase substantially the circuit breaker bulk life time.
To achieve these goals; The technical scheme of the utility model is: 1, a kind of pair of opening velocity permanent-magnet manipulating mechanism; It comprises the permanent magnetism iron core, is used to produce magnetic field force and drives the permanent magnetism iron core to the magnetizing coil that closes a floodgate, the separating brake direction is moved that this permanent magnetism iron core upper end connects sluice separating spring, lower end connection divide-shut brake drive rod; It is characterized in that it comprises that also being used to produce magnetic field force stops the separating brake deceleration coil of permanent magnetism iron core to the motion of separating brake direction.
Preferably; Permanent magnetism iron core, magnetizing coil and separating brake deceleration coil groups are put into the mild steel barrel shrond; At this barrel shrond upper and lower cover plate is set; The permanent magnetism iron core can be arranged at the center in the mild steel barrel shrond up or down, and magnetizing coil is arranged on the bottom in the mild steel barrel shrond, and separating brake deceleration coil is arranged on the top in the mild steel barrel shrond.
Preferably; Two opening velocity permanent-magnet manipulating mechanisms also comprise manual switching-off device; This manual switching-off device comprises manual brake separating cam and manual brake separating bar; The manual brake separating cam is connected with the manual brake separating bar, and the manual brake separating bar is connected with permanent magnetism iron core upper end, and sluice separating spring is arranged between permanent magnetism iron core and the manual brake separating bar; A kind of in addition structure is, the manual brake separating bar passes sluice separating spring and is connected with permanent magnetism iron core upper end, and sluice separating spring is limited between the upper cover plate of manual brake separating bar and mild steel barrel shrond.
Preferably, the permanent magnetism iron core evenly is arranged in around the cylindrical mild steel iron core by fan-shaped nd-fe-b magnet, firmly forms with the PU glue bond again.
Compared with prior art; The utility model do not occur short circuit unusual, when relay does not move; By the permanent magnet mechanism control circuit board a smaller electric current being provided is separating brake deceleration coil to the another one coil; Separating brake deceleration coil produces a magnetic field force that stops the permanent magnetism iron core to the motion of separating brake direction, in order to reduce the responsiveness of sluice separating spring after obtaining this little electric current.Low opening velocity will make the iron core high speed separating brake bump that is bonded with rubidium iron boron permanent magnet become low speed separating brake bump; The slack-off rubidium iron boron permanent magnet material to fragility of stroke speed has significantly protection; Simultaneously; The speed that low opening velocity also will make the bellows of vacuum tube stretched is slack-off, and the separating brake overshoot of whole circuit breaker will be overcome, and this also plays a protective role to the stretcher strain of vacuum tube bellows; Also will improve greatly the mechanical endurance of vacuum tube, thereby will increase substantially the mechanical endurance of whole circuit breaker.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further to specify.
Fig. 1 is the combined floodgate structural representation of the two opening velocity permanent-magnet manipulating mechanisms of the utility model.
Fig. 2 is the separating brake structural representation of the two opening velocity permanent-magnet manipulating mechanisms of the utility model.
Fig. 3 is the vacuum tube structure sketch map.
Fig. 4 is the structural representation that the utility model is applied to vacuum circuit-breaker.
Embodiment
See also Fig. 1 and Fig. 2; The permanent magnetism iron core 1 of present embodiment evenly is arranged in around the cylindrical mild steel iron core by seven fan-shaped nd-fe-b magnets; Firmly make it into as a wholely again with the PU glue bond, this permanent magnetism iron core end face has certain suction makes circuit breaker adhesive to remain on the switch closing position.This permanent magnetism iron core 1 and magnetizing coil 2 and separating brake deceleration coil 3 are assembled into the cylindrical housing 4 of a mild steel; Again at these barrel shrond 4 upper and lower cover plate 5 and lower covers 6 loaded onto respectively; Fastening with screw; Refill divide-shut brake drive rod 7 and sluice separating spring 8 and complete permanent-magnet manipulating mechanism of manual brake separating cam mechanism 9 compositions with two opening velocities and manual brake separating function.
Two opening velocity permanent-magnet manipulating mechanism operation principles of present embodiment are: when the vacuum tube circuit breaker need close a floodgate; Control circuit board is given bigger electric current of magnetizing coil; Coil produces a more intense magnetic field; This bigger magnetic field force drives the permanent magnetism iron core and moves to the combined floodgate direction; Iron core is pushed switch to closing position rapidly when motion, will be contained in stroke of sluice separating spring compression of permanent magnet mechanism outside simultaneously, finally leans on the residue suction of permanent magnetism iron core that circuit breaker is remained on closing position always.When circuit breaker needs separating brake; Circuit board is given opposite smaller electric current of magnetizing coil, and coil produces an opposite more weak magnetic field, and this magnetic field force only need overcome the smaller residue confining force of permanent magnetism iron core at closing position; When the permanent magnetism iron core has just left mild steel lower cover end face; The suction of magnet reduces greatly, at this moment under the promotion of sluice separating spring, the permanent magnetism iron core drive switch to separating brake direction rapid movement to the separating brake position.This opening velocity is very high, generally reaches 0.8-1.2m/s.
In order to reduce the opening velocity of circuit breaker when cut-offfing rated current; Control system do not occur short circuit unusual, when relay does not move; By the permanent magnetism operating mechanism control circuit plate a smaller electric current being provided is separating brake deceleration coil to the another one coil; This separating brake deceleration coil produces a magnetic field force that stops the permanent magnetism iron core to the motion of separating brake direction, in order to reduce the responsiveness of sluice separating spring after obtaining this little electric current.Like this, in the circuit breaker application scenario of frequent movement, with the mechanical endurance of improving circuit breaker greatly.When distribution occur short circuit unusual, when relay moves immediately, the permanent magnet mechanism control circuit board then do not provide this in order to the electric current that slows down to the separating brake coil that slows down.Be this time this separating brake deceleration coil inoperative.
Because separating brake is mainly to lean on sluice separating spring to realize, realize that manual brake separating only need overcome the residue confining force of permanent magnetism iron core, the confining force=permanent magnet wicking of permanent magnetism iron core residue is made a concerted effort-switch contact pressure-sluice separating spring power.So utilize rotating cam mechanism that the residue confining force of smaller permanent magnetism iron core is backed down, move the realization separating brake rapidly by sluice separating spring then.Not action of whole permanent magnet mechanism control circuit board during manual brake separating, so separating brake deceleration coil also is failure to actuate, manual brake separating speed is not affected, and can reach the opening velocity that needs.
See also Fig. 3 and Fig. 4, vacuum circuit-breaker comprises two opening velocity permanent-magnet manipulating mechanisms 17 and vacuum tube 18, connects between two opening velocity permanent-magnet manipulating mechanisms 17 and the vacuum tube 18 and is encapsulated in the shell.Vacuum tube 18 mainly is made up of fixed contact and moving contact; Fixed contact and integral body of static conductive rod 10 formation extend to ceramic package 11 outsides and are used to be connected the circuit breaker end of incoming cables, and moving contact extends to ceramic package 11 outsides with moving conductive rod 12 and integral body of bellows 13 formation and is used to be connected the circuit breaker leading-out terminal; Quiet cover plate 14 is with ceramic package 11 and move cover plate 15, bellows 13 is welded into a shell contact system 16 is sealed in this housings, and the inside vacuumizes, and makes contact system 16 in this vacuum tube the inside divide-shut brake action, so the called after vacuum switch tube.This permanent magnet mechanism with two opening velocities and manual brake separating function is applied on the vacuum circuit-breaker, can make vacuum circuit-breaker have two opening velocities and manual brake separating function, improves mechanical endurance greatly.
Claims (5)
1. two opening velocity permanent-magnet manipulating mechanism; It comprises the permanent magnetism iron core, is used to produce magnetic field force and drives the permanent magnetism iron core to the magnetizing coil that closes a floodgate, the separating brake direction is moved; This permanent magnetism iron core upper end connects sluice separating spring; The lower end connects the divide-shut brake drive rod, it is characterized in that, it comprises that also being used to produce magnetic field force stops the separating brake deceleration coil of permanent magnetism iron core to the motion of separating brake direction.
2. according to claim 1 pair of opening velocity permanent-magnet manipulating mechanism; It is characterized in that; Said permanent magnetism iron core, magnetizing coil and separating brake deceleration coil groups are put into the mild steel barrel shrond, at this barrel shrond upper and lower cover plate are set, and the permanent magnetism iron core can be arranged at the center in the mild steel barrel shrond up or down; Magnetizing coil is arranged on the bottom in the mild steel barrel shrond, and separating brake deceleration coil is arranged on the top in the mild steel barrel shrond.
3. according to claim 1 pair of opening velocity permanent-magnet manipulating mechanism; It is characterized in that; It also comprises manual switching-off device, and this manual switching-off device comprises manual brake separating cam and manual brake separating bar, and the manual brake separating cam is connected with the manual brake separating bar; The manual brake separating bar is connected with permanent magnetism iron core upper end, and sluice separating spring is arranged between permanent magnetism iron core and the manual brake separating bar.
4. according to claim 2 pair of opening velocity permanent-magnet manipulating mechanism; It is characterized in that; It also comprises manual switching-off device, and this manual switching-off device comprises manual brake separating cam and manual brake separating bar, and the manual brake separating cam is connected with the manual brake separating bar; The manual brake separating bar passes sluice separating spring and is connected with permanent magnetism iron core upper end, and sluice separating spring is limited between the upper cover plate of manual brake separating bar and mild steel barrel shrond.
5. according to claim 1 pair of opening velocity permanent-magnet manipulating mechanism is characterized in that, said permanent magnetism iron core evenly is arranged in around the cylindrical mild steel iron core by fan-shaped nd-fe-b magnet, firmly forms with the PU glue bond again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204628929U CN202373516U (en) | 2011-11-18 | 2011-11-18 | Double-opening-speed permanent-magnet operation mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204628929U CN202373516U (en) | 2011-11-18 | 2011-11-18 | Double-opening-speed permanent-magnet operation mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373516U true CN202373516U (en) | 2012-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204628929U Expired - Fee Related CN202373516U (en) | 2011-11-18 | 2011-11-18 | Double-opening-speed permanent-magnet operation mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202373516U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426974A (en) * | 2011-11-18 | 2012-04-25 | 埃尔凯电器（珠海）有限公司 | Dual-brake-separating speed permanent magnetic operating mechanism and vacuum circuit breaker |
| CN103903923A (en) * | 2014-04-21 | 2014-07-02 | 国家电网公司 | Disconnector and operating mechanism thereof |
-
2011
- 2011-11-18 CN CN2011204628929U patent/CN202373516U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426974A (en) * | 2011-11-18 | 2012-04-25 | 埃尔凯电器（珠海）有限公司 | Dual-brake-separating speed permanent magnetic operating mechanism and vacuum circuit breaker |
| CN103903923A (en) * | 2014-04-21 | 2014-07-02 | 国家电网公司 | Disconnector and operating mechanism thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20141118 |
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| EXPY | Termination of patent right or utility model |