CN114420513B - Flexible quick breaker driving mechanism - Google Patents
Flexible quick breaker driving mechanism Download PDFInfo
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- CN114420513B CN114420513B CN202210054967.2A CN202210054967A CN114420513B CN 114420513 B CN114420513 B CN 114420513B CN 202210054967 A CN202210054967 A CN 202210054967A CN 114420513 B CN114420513 B CN 114420513B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 64
- 210000001503 joint Anatomy 0.000 claims abstract 2
- 230000003139 buffering effect Effects 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000036632 reaction speed Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007849 functional defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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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
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
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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
- H01H71/66—Power reset mechanisms
- H01H71/68—Power reset mechanisms actuated by electromagnet
-
- 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
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
- H01H2071/328—Electromagnetic mechanisms having permanently magnetised part using a spring for having minimal force on armature while maximal force on trip pin
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a flexible quick breaker driving mechanism, which belongs to the technical field of breakers and comprises a solid-sealed polar pole, a box body and a permanent magnet driving mechanism; the permanent magnet driving mechanism comprises a movable iron core, a closing overtravel spring, a closing spring seat, a push rod, an upper end cover, a sleeve and a lower end cover; the closing spring seat is inserted into the upper end cover, and the bottom of the closing spring seat is connected with the movable iron core; the switching-on overtravel spring is arranged in the switching-on spring seat, and two ends of the switching-on overtravel spring are in butt joint with the ejector rod and the movable iron core; and a closing coil and a separating coil are arranged in the sleeve. The closing coil is electrified, the movable iron core compresses the closing overtravel spring, impact kinetic energy is buffered, and bouncing is reduced; the closing over-travel spring has a pressing force on the moving contact, so that the contact is ensured to be reliably closed, and a reasonable over-travel distance is provided so as to be suitable for the contact wear allowance; the contact pre-tightening force and the over-travel range can be conveniently adjusted by integrating the contact pre-tightening force and the over-travel range into the permanent magnet driving mechanism. The opening coil is electrified, and the closing over-travel spring provides initial opening power to ensure the rapid opening speed.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a flexible quick circuit breaker driving mechanism.
Background
With the increasing complexity of the grid structure and load characteristics, many sensitive electrical loads connected to the power system are extremely susceptible to short-term disturbances from the power system, such as voltage drops and voltage spikes, and therefore increasingly stringent requirements are placed on the quality of electrical energy and operational reliability. Therefore, in order to protect sensitive industrial loads and to improve the power quality of the power system, it is required that the protective device high-voltage switch has a very high opening and closing speed. For example, a new parallel capacitor phase-selecting switching technology for reactive compensation requires that a switch is fast, no bounce and long service life are required to be closed, and only the performance of the switch can show the excellent electric energy quality index of the technology.
At present, a spring operating mechanism, an electromagnetic operating mechanism and a hydraulic operating mechanism are generally adopted for providing power for switching on or switching off, the switching-on time of the spring operating mechanism, the electromagnetic operating mechanism and the hydraulic operating mechanism is generally 40 ms-60 ms, and the switching-off time is generally 20 ms-40 ms. The shortest opening time is also greater than 20ms, and the longer the fault current is, the stronger the impact on the power grid and the damage to the equipment. Therefore, the high-voltage switch adopting the traditional operating mechanism is difficult to realize the requirement of quick switching-on and switching-off.
The domestic quick switch using the principle of electromagnetic repulsion mostly adopts a disc spring bistable structure, and the opening and closing needs to overcome the huge energy storage of the disc spring, so that high direct current voltage is needed, huge repulsive force is generated, the volume is increased, the repulsive force disc is broken, and serious closing bounce, opening and closing bounce and quick switch contact damage are more easily caused.
And the current breaker over-travel distance is very troublesome to adjust, and a special endoscope is required to extend into the solid-sealed polar pole, and the detection of relevant parts is required to detect whether the over-travel is qualified.
By combining the above situations, the prior art has some functional defects, so that the product can not meet the requirement of quick switching; the electromagnetic repulsion driving mechanism can achieve the quick index naturally, but the application range of the quick switch is limited due to the technical index problems of service life, closing bounce and the like which cannot be solved. This is a disadvantage of the prior art.
Disclosure of Invention
In order to solve the problems, the invention provides the flexible quick breaker driving mechanism, the closing overtravel spring is integrated into the permanent magnet driving mechanism, the contact pretightening force and the overtravel range can be conveniently and accurately adjusted, the opening speed is high, and closing bouncing is effectively avoided.
The invention is realized by the following technical scheme:
A flexible quick breaker driving mechanism comprises a solid-sealed polar pole, a box body and a permanent magnet driving mechanism;
The solid-sealed polar pole comprises a wire inlet end, a vacuum arc-extinguishing chamber, a wire outlet end and an insulating pull rod, wherein the wire outlet end is connected with a soft copper bar, and the vacuum arc-extinguishing chamber is internally provided with a fixed contact and a movable contact which are respectively connected with the wire inlet end and the soft copper bar;
the bottom of the box body is connected and installed with the bottom of the solid sealing polar pole;
the permanent magnet driving mechanism comprises a movable iron core, a closing over-travel spring, a closing spring seat, a push rod connected with the lower end of the insulating pull rod, and an upper end cover, a sleeve and a lower end cover which are sequentially connected from top to bottom, wherein the upper end cover is connected with the box body; the closing spring seat is inserted in the middle of the upper end cover in a sliding way, and the bottom of the closing spring seat is connected with the movable iron core; the switching-on overtravel spring is arranged in the switching-on spring seat, and the upper end and the lower end of the switching-on overtravel spring are respectively abutted with the bottom end of the ejector rod and the movable iron core; and a closing coil and a separating coil which respectively have upper and lower electromagnetic driving forces on the movable iron core are also arranged in the sleeve.
The invention further improves that a brake separating spring seat is arranged on the lower end cover, and a brake separating buffer spring elastically supporting the movable iron core is arranged in the brake separating spring seat.
The invention further improves that the upper end of the brake separating buffer spring is provided with a brake separating buffer block, and the upper end of the brake separating spring seat is inwards folded to form a turnup for limiting the upward movement of the brake separating buffer block.
The invention further improves that the lower side of the lower end cover is provided with a fixed end cover which is abutted with the lower end of the opening buffer spring.
The invention further improves, also comprises a buffer balancing weight, and the upper part of the upper end cover is provided with a guide piece for vertically sliding and guiding the buffer balancing weight; and a supporting block for buffering the impact of the balancing weight is arranged on the upper part of the closing spring seat.
According to a further improvement of the invention, a limiting piece for limiting the downward movement of the buffer balancing weight is arranged on the guide piece.
The invention further improves that a magnetic shoe is arranged between the closing coil and the opening coil, and a transition iron ring is arranged on the inner side of the magnetic shoe.
The invention further improves that the closing coil comprises a closing coil framework, a closing main coil and a separating auxiliary coil, wherein the closing main coil and the separating auxiliary coil are wound on the closing coil framework, and the number of turns of the closing main coil is larger than that of the separating auxiliary coil; the opening coil comprises an opening coil framework, an opening main coil and a closing auxiliary coil, wherein the opening main coil and the closing auxiliary coil are wound on the opening coil framework, and the number of turns of the opening main coil is larger than that of the closing auxiliary coil.
The invention further improves that the lower part of the movable iron core is sleeved on the upper part of the brake separating spring seat in a sliding way.
The invention further improves that the closing spring seat is made of stainless steel non-magnetic conductive material.
From the technical scheme, the beneficial effects of the invention are as follows:
The closing coil and the opening coil are respectively electrified, so that the upper and lower attraction of the movable iron core can be realized, the closing and the separation of the movable contact and the fixed contact can be realized through the ejector rod and the insulating pull rod, and the rapid opening and closing action can be realized. In the closing process, the closing coil is electrified, the movable iron core is attracted upwards, the movable iron core drives the closing spring seat to move upwards, and simultaneously the closing over-travel spring is compressed, so that the kinetic energy of closing impact is effectively buffered, closing bounce is reduced, and the service life of the contact is ensured; the closing over-travel spring has a certain upward pressing force on the moving contact through the ejector rod and the insulating pull rod, so that the closing reliability of the moving contact and the static contact is ensured, and a reasonable over-travel distance can be provided, so that the closing over-travel spring is suitable for the abrasion allowance in the whole life cycle; the switch-on overtravel spring is integrated into the permanent magnet driving mechanism in the box body, the contact pretightening force and the overtravel range can be intuitively, conveniently and accurately adjusted, an endoscope is not needed, and adjustment is realized through the threaded rotation of the ejector rod relative to the insulating pull rod. In a closing state, the opening coil is electrified, the movable iron core is attracted downwards, the closing overtravel spring has larger energy storage capacity, initial opening power is provided, the opening speed is higher, and the opening time is shortened. The whole structure is simple, the realization is easy, and the practicality is good.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a front view structure of an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of the structure A-A of FIG. 2.
Fig. 4 is a schematic diagram of a closing state according to an embodiment of the present invention.
FIG. 5 is a schematic diagram showing a brake-off state according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a closing coil according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a brake-separating coil according to an embodiment of the invention.
In the accompanying drawings: 100. the permanent magnet type switching-on and switching-off device comprises a solid-sealed pole column, 200, a box body, 300, a permanent magnet driving mechanism, 1, a wire inlet end, 2, solid-sealed resin, 3, a vacuum arc extinguishing chamber, 4, a wire outlet end, 5, a soft copper bar, 6, an insulating pull rod, 7, a buffer balancing weight, 8, a supporting block, 9, a connecting plate, 10, a switching-on overtravel spring, 11, a switching-on coil, 12, a magnetic shoe, 13, a transition iron ring, 14, a switching-off buffer block, 15, a lower end cover, 16, a push rod, 17, a guiding positioning stud, 18, a switching-on spring seat, 19, an upper end cover, 20, a movable iron core, 21, a sleeve, 22, a switching-off buffer spring, 23, a switching-off coil, 24, a switching-off spring seat, 25, a fixed end cover, 1101, a switching-on coil framework, 1102, a switching-off auxiliary coil, 1103, a switching-on main coil, 2301, a switching-off coil framework, 2302, a switching-on auxiliary coil, 2303 and a switching-off main coil.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the invention are intended to be within the scope of the patent protection.
As shown in fig. 1 to 5, the invention discloses a flexible quick breaker driving mechanism, which comprises a solid sealed pole 100, a box 200 and a permanent magnet driving mechanism 300;
the solid-sealed polar pole 100 comprises an insulating pull rod 6, a wire inlet end 1, a vacuum arc-extinguishing chamber 3 and a wire outlet end 4 which are sequentially arranged from top to bottom, wherein solid-sealed resin 2 is fixedly sealed on the outer sides of the components, a soft copper bar 5 is connected to the wire outlet end 4, and a fixed contact and a movable contact which are respectively connected with the wire inlet end 1 and the soft copper bar 5 are arranged in the vacuum arc-extinguishing chamber 3;
the bottom of the box body 200 and the bottom of the solid-sealed polar pole 100 are fixedly connected and installed through bolts;
The permanent magnet driving mechanism 300 is arranged in the box body 200 and comprises a movable iron core 20, a closing overtravel spring 10, a closing spring seat 18 with a cylindrical structure, a push rod 16 in threaded connection with the lower end of the insulating pull rod 6, an upper end cover 19, a sleeve 21 and a lower end cover 15 which are sequentially connected and arranged from top to bottom, wherein the left side and the right side of the upper end cover 19 are respectively connected and arranged with the side wall of the box body 200 through connecting plates 9; the closing spring seat 18 is slidably inserted in the middle of the upper end cover 19, and the bottom of the closing spring seat 18 is connected with the movable iron core 20; the closing overtravel spring 10 is arranged in the closing spring seat 18, and the upper end and the lower end of the closing overtravel spring are respectively abutted with the bottom end of the ejector rod 16 and the movable iron core 20; the sleeve 21 is also provided therein with a closing coil 11 and a separating coil 23 each having an upper and a lower electromagnetic driving force to the movable iron core 20, and the closing coil 11 and the separating coil 23 are disposed up and down.
The closing coil 11 and the opening coil 23 are respectively electrified, so that the upper and lower attraction of the movable iron core 20 can be realized, and the closing and the separation of the movable contact and the fixed contact are realized through the ejector rod 16 and the insulating pull rod 6, so that the rapid opening and closing actions are realized. In the closing process, the closing coil 11 is electrified, the movable iron core 20 is attracted upwards, the movable iron core 20 drives the closing spring seat 18 to move upwards, and simultaneously the closing overtravel spring 10 is compressed, so that the kinetic energy of closing impact is effectively buffered, closing bounce is reduced, and the service life of a contact is ensured; the closing over-travel spring 10 has a certain upward pressing force on the moving contact through the ejector rod 16 and the insulating pull rod 6, ensures the closing reliability of the moving contact and the fixed contact, can provide a reasonable over-travel distance, and is suitable for the abrasion allowance in the whole life cycle; the switch-on overtravel spring 10 is integrated into the permanent magnet driving mechanism 300 in the box 200, so that the contact pretightening force and the overtravel range can be intuitively, conveniently and accurately adjusted, an endoscope is not required, and the adjustment is realized by the threaded rotation of the ejector rod 16 relative to the insulating pull rod 6. In the closing state, the opening coil 23 is electrified, the movable iron core 20 is attracted downwards, the closing overtravel spring 10 has larger energy storage capacity, initial opening power is provided, the opening speed is ensured to be higher, and the opening time is shortened. The whole structure is simple, the realization is easy, and the practicality is good.
As shown in fig. 4-5, a brake release spring seat 24 with a cylindrical structure is installed in the middle of the lower end cover 15, and a brake release buffer spring 22 elastically supporting the movable iron core 20 is installed in the brake release spring seat 24. In the brake separating process, the movable iron core 20 moves downwards, and the brake separating buffer spring 22 elastically supports the movable iron core 20, so that the speed of the lower end surface of the movable iron core 20 in contact with the lower end cover 15 can be effectively reduced, brake separating kinetic energy is consumed, strong impact and damage to components are avoided, rebound is prevented, and the service life is ensured; in the initial closing state, the opening buffer spring 22 has high energy storage capacity, can provide initial closing power, greatly improves closing speed and shortens closing time.
As shown in fig. 4-5, the upper end of the brake separating buffer spring 22 is provided with a brake separating buffer block 14 in a stepped boss shape, and the upper end of the brake separating spring seat 24 is turned inwards to form a turnup for limiting the upward movement of the brake separating buffer block 14. The brake separating buffer block 14 is used for transmitting the pressure of the brake separating buffer spring 22 of the movable iron core 20, and the step boss-shaped brake separating buffer block 14 is limited in the upward direction through the flanging, so that the brake separating buffer block 14 is prevented from sliding upwards and falling out, and reliable buffering and energy storage are ensured. In the opening state, the distance between the lower surface of the flange and the upper surface of the boss at the lower part of the opening buffer block 14 is e, that is, e is the movable distance (the telescopic distance of the opening buffer spring 22) of the opening buffer block 14.
As shown in fig. 4 to 5, a fixed end cap 25 supported at the lower end of the opening buffer spring 22 is mounted at the lower side of the lower end cap 15 by bolts. The middle part of the upper side of the fixed end cover 25 is inserted into the bottom of the opening spring seat 24 to play a role in positioning and mounting, and each part is designed in a split type, so that the fixed end cover is easy to process and manufacture, convenient to assemble and disassemble and convenient to overhaul.
As shown in fig. 4-5, the mechanism further comprises a buffer balancing weight 7 sleeved on the upper part of the ejector rod 16 in a sliding manner, and a plurality of guide pieces for guiding the buffer balancing weight 7 in a vertical sliding manner are arranged on the upper annular array of the upper end cover 19; the upper portion of the closing spring seat 18 is provided with a supporting block 8 for supporting the buffering balancing weight 7, the supporting block 8 is rotatably arranged on the inner ring of the upper portion of the closing spring seat 18, the supporting block 8 is sleeved on the outer side of the ejector rod 16 in a sliding manner, and a boss is arranged at the lower end of the ejector rod 16. In the closing state, the distance between the bottom surface of the supporting block 8 and the upper surface of the boss at the lower part of the ejector rod 16 is d, and d is the over-travel distance, so as to provide safe and reliable pressure and abrasion allowance in the whole life cycle for the contact. In the switching-on process, before the movable contact and the fixed contact are contacted, the supporting block 8 impacts the buffer balancing weight 7, a certain amount of speed reduction is realized on the movable iron core 20, the switching-on spring seat 18, the ejector rod 16, the insulating pull rod 6 and the movable contact, and at the moment of the contact of the movable contact and the fixed contact, the speed is reduced to be within the allowable range value of the vacuum arc-extinguishing chamber 3, so that the overall service life can be prolonged, and switching-on bouncing can be effectively eliminated. The lower side of the buffer balancing weight 7 is provided with a guide hole in sliding fit with a guide piece, and the smoothness and accuracy of the up-and-down movement of the buffer balancing weight 7 can be realized through the sliding fit of the guide piece and the guide hole; in the closing state, the distance between the top surface of the guide hole and the top of the guide piece is b, so that a reserved space is reserved.
As shown in fig. 4-5, a limiting part for limiting the downward movement of the buffer balancing weight 7 is arranged on the guide part. The position of the buffer balancing weight 7 moving downwards is limited through the limiting piece, when the brake is released, the distance between the supporting block 8 and the buffer balancing weight 7 is f, the supporting block 8 is impacted with the buffer balancing weight 7 before the movable contact and the static contact are about to be contacted, the faster brake-on speed before the impact can be ensured, and the instant speed when the brake is close to the brake-on state can be greatly reduced.
The guide piece is a guide positioning stud 17, the limiting piece is a nut, the guide positioning stud 17 is rotatably mounted on the upper side of the upper end cover 19, and the nut is rotatably mounted on the guide positioning stud 17, so that the guide positioning stud 17 can be conveniently dismounted and vertically adjusted. In the closing state, the distance between the upper surface of the nut and the lower surface of the buffer balancing weight 7 is a, wherein a is the closing impact starting distance, and a is smaller than b. Where h=a+d+ (2 to 4 mm) =a+f.
Wherein, the lower side of the upper wall of the box body 200 is provided with a rubber gasket for buffering the impact of the buffer balancing weight 7. In the closing process, when the supporting block 8 impacts the buffering balancing weight 7, the buffering balancing weight 7 is buffered through the rubber gasket, so that the buffering balancing weight 7 is prevented from directly colliding with the upper wall of the box 200, and the use safety and reliability are guaranteed.
As shown in fig. 4-5, a magnetic shoe 12 which is closely attached to the inner wall of the sleeve 21 is arranged between the closing coil 11 and the opening coil 23, and a transition iron ring 13 is arranged on the inner side of the magnetic shoe 12. The magnetic shoe 12 is a permanent magnet, and the closing spring seat 18 is made of stainless steel non-magnetic conductive material, so that the magnetic connection with the closing part is effectively avoided. The magnetic shoe 12, the transition iron ring 13, the movable iron core 20, the upper end cover 19 and the sleeve 21 form a closing magnetic circuit together, when the closing coil 11 is powered on, the upper surface of the movable iron core 20 and the lower surface of the upper end cover 19 form strong magnetic attraction, at the moment, the closing over-travel spring 10 has a downward thrust, and the closing net retention force is obtained by subtracting the thrust of the closing over-travel spring 10 from the magnetic attraction. The magnetic shoe 12, the transition iron ring 13, the movable iron core 20, the lower end cover 15 and the sleeve 21 form a brake separating magnetic circuit together, when the brake separating coil 23 is powered on, the lower surface of the movable iron core 20 and the upper surface of the lower end cover 15 form strong magnetic attraction, at the moment, the brake separating buffer spring 22 has an upward thrust and a moving contact counter force (restoring elastic force), and the thrust of the brake separating buffer spring 22 and the moving contact counter force are subtracted by the magnetic attraction at the moment, so that the brake separating net holding force is obtained.
As shown in fig. 6-7, the closing coil 11 includes a closing coil bobbin 1101, a closing main coil 1103 and a switching-off auxiliary coil 1102 wound on the closing coil bobbin 1101, the number of turns of the closing main coil 1103 is much larger than that of the switching-off auxiliary coil 1102; the opening coil 23 includes an opening bobbin 2301, an opening main coil 2303 wound on the opening bobbin 2301, and a closing auxiliary coil 2302, the number of turns of the opening main coil 2303 being much larger than the number of turns of the closing auxiliary coil 2302. The number of turns of the switching main coils 1103A+B-and the switching main coils 2303C+D-is large, and the number of turns of the switching auxiliary coils 2302c+d-and the switching auxiliary coils 1102a+b-is small. In order to realize the high-speed switching-on and switching-off characteristic of the quick switch, auxiliary coils are arranged on the inner side of the main coil, namely two coils are arranged in a coil framework, one is the main coil, and the other is the auxiliary coil. The main coil needs a large driving force, the number of turns of the coil is large, the resistance and the inductance are large, and the reaction speed after electricity is obtained is low under the same driving current; the auxiliary coil only needs to overcome the switching-on/off holding force, does not need a large driving force, can achieve the advantages of minimum number of turns of the coil, small resistance and inductance, and very high reaction speed after power is obtained under the same driving current. When the switching-on and switching-off is matched, a very high switching-on and switching-off speed can be obtained, and the switching-on and switching-off time is effectively shortened.
As shown in fig. 4-5, the lower part of the movable iron core 20 is sleeved on the upper part of the brake release spring seat 24 in a sliding manner; the movable iron core 20 is of a cylindrical structure, a transverse partition plate is arranged in the middle of the inside of the movable iron core 20, and the movable iron core 20 is light in weight and reasonable in magnetic conduction; the upper part of the movable iron core 20 is fixedly sleeved with the lower part of the closing spring seat 18, and the bottom of the closing overtravel spring 10 is supported by the partition plate. In the process of the on-off movement of the movable iron core 20, the upper end cover 19 is used for vertically guiding the on-off spring seat 18 in a sliding manner and the movable iron core 20 is vertically guided in a sliding manner through the off-off spring seat 24, so that the accuracy and stability of the up-and-down movement of the movable iron core 20 are ensured. In the closing state, the distance between the upper surface of the opening buffer block 14 and the partition plate of the movable iron core 20 is c.
Wherein, the middle part of the partition board inside the movable iron core 20, the middle part of the brake separating buffer block 14 and the middle part of the fixed end cover 25 are respectively provided with corresponding through holes. The internal space is guaranteed to be communicated with the outside, high pressure is avoided from being generated inside, and the reliability, stability, accuracy and safety of use are guaranteed.
The flexible quick breaker driving mechanism specifically acts as follows:
Fig. 5 is a schematic diagram of the opening state, e is the movable distance of the opening buffer block 14, at this time, the opening buffer spring 22 is in the maximum energy storage state, and the closing overtravel spring 10 is in the initial energy storage position. When the switch is closed, the main switch coil 1103A+B-and the auxiliary switch coil 2302c+d-are simultaneously electrified with direct current, and as the auxiliary switch coil 2302c+d-has small resistance, high reaction speed and instant rising of driving force to the maximum, the switch-off holding force is overcome, when the switch-off contact surface just falls off, the energy storage of the switch-off buffer spring 22 is instantly released, and a very large pushing force is provided for the movable iron core 20 through the switch-off buffer block 14, and the two forces (driving force and pushing force) are overlapped to enable the movable iron core 20, the insulating pull rod 6 and other moving components to act in advance and accelerate. At this time, the driving force of the closing main coil 1103a+b-will also peak, providing a strong continuous thrust for the moving parts that have already been accelerated. In the opening state, the set distance between the buffer balancing weight 7 and the supporting block 8 is f, f is smaller than the contact opening distance, the contact opening distance is a+ (2-4 mm), and the stroke h is equal to the contact opening distance plus the over-stroke distance d. When the moving contact and the fixed contact of the switch are about to be contacted (the distance is 2-4 mm), the supporting block 8 and the buffering balancing weight 7 are contacted, impacted and decelerated, and after the moving contact and the fixed contact are contacted, the closing over-travel spring 10 plays roles of buffering and energy storage. Therefore, the allowable speed of the switch can be achieved, and on the premise of realizing high-speed switching-on, the service life of the switch is greatly prolonged, and switching-on bouncing is eliminated.
Fig. 4 is a schematic diagram of a closing state, in which the closing overtravel spring 10 is in a maximum energy storage state, and the opening buffer spring 22 is in an initial energy storage position; c is the initial distance of the opening buffer. When the brake is separated, the main brake separating coil 2303C+D-and the auxiliary brake separating coil 1102a+b-are simultaneously electrified with direct current, and as the auxiliary brake separating coil 1102a+b-has small resistance inductance and high reaction speed, the driving force is instantaneously raised to the maximum value, the brake-on retaining force is overcome, when the contact surface just falls off, the stored energy of the brake-on overtravel spring 10 is instantaneously released, the very large thrust is provided for the movable iron core 20, and the two forces (driving force and thrust) are superposed to act and accelerate the movable iron core 20, the insulating pull rod 6 and other moving parts in advance. The driving force of the time-division switching main coil 2303c+d-will also peak, providing a strong continuous pushing force for the moving parts that have been accelerated. When the brake is closed, the distance between the brake separating buffer block 14 and the movable iron core 20 is c, and the running distance e from the brake separating buffer block 14 to the brake separating state is set to be 3-4mm, so that the brake separating speed is not influenced, and the brake separating buffer block has a substantial buffering effect. After the movable iron core 20 contacts with the brake release buffer block 14, the brake release buffer spring 22 plays roles of buffering and energy storage. On the premise of realizing high-speed brake separation, the service life of the permanent magnet driving mechanism is greatly prolonged, and brake separation rebound is eliminated.
The flexible quick breaker driving mechanism has the advantages of simple integral structure, easy realization and good practicability. The closing coil and the opening coil are respectively electrified, so that the upper and lower attraction of the movable iron core can be realized, the closing and the separation of the movable contact and the fixed contact can be realized through the ejector rod and the insulating pull rod, and the rapid opening and closing action can be realized. In the closing process, the closing coil is electrified, the movable iron core is attracted upwards, the movable iron core drives the closing spring seat to move upwards, and simultaneously the closing over-travel spring is compressed, so that the kinetic energy of closing impact is effectively buffered, closing bounce is reduced, and the service life of the contact is ensured; the closing over-travel spring has a certain upward pressing force on the moving contact through the ejector rod and the insulating pull rod, so that the closing reliability of the moving contact and the static contact is ensured, and a reasonable over-travel distance can be provided, so that the closing over-travel spring is suitable for the abrasion allowance in the whole life cycle; the switch-on overtravel spring is integrated into the permanent magnet driving mechanism in the box body, the contact pretightening force and the overtravel range can be intuitively, conveniently and accurately adjusted, an endoscope is not needed, and adjustment is realized through the threaded rotation of the ejector rod relative to the insulating pull rod. In a closing state, the opening coil is electrified, the movable iron core is attracted downwards, the closing overtravel spring has larger energy storage capacity, initial opening power is provided, the opening speed is higher, and the opening time is shortened.
In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments are only required to be referred to each other.
The terms "upper", "lower", "outside", "inside", and the like in the description and in the claims of the present invention and in the above drawings, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The flexible quick breaker driving mechanism is characterized by comprising a solid-sealed pole (100), a box body (200) and a permanent magnet driving mechanism (300); the solid-sealed polar pole (100) comprises a wire inlet end (1), a vacuum arc-extinguishing chamber (3), a wire outlet end (4) and an insulating pull rod (6), wherein the wire outlet end (4) is connected with a soft copper bar (5), and a fixed contact and a movable contact which are respectively connected with the wire inlet end (1) and the soft copper bar (5) are arranged in the vacuum arc-extinguishing chamber (3); the box body (200) is connected and installed with the bottom of the solid-sealed polar pole (100); the permanent magnet driving mechanism (300) comprises a movable iron core (20), a closing over-travel spring (10), a closing spring seat (18), a push rod (16) connected with the lower end of an insulating pull rod (6), and an upper end cover (19), a sleeve (21) and a lower end cover (15) which are sequentially connected from top to bottom, wherein the upper end cover (19) is connected with the box body (200); the closing spring seat (18) is inserted in the middle of the upper end cover (19) in a sliding way, and the bottom of the closing spring seat is connected with the movable iron core (20); the closing overtravel spring (10) is arranged in the closing spring seat (18), and the upper end and the lower end of the closing overtravel spring are respectively in butt joint with the bottom end of the ejector rod (16) and the movable iron core (20); a closing coil (11) and a separating coil (23) which respectively have upper and lower electromagnetic driving forces on the movable iron core (20) are also arranged in the sleeve (21);
A brake separating spring seat (24) is arranged on the lower end cover (15), and a brake separating buffer spring (22) which elastically supports the movable iron core (20) is arranged in the brake separating spring seat (24); the upper end of the opening buffer spring (22) is provided with an opening buffer block (14), and the upper end of the opening spring seat (24) is turned inwards and folded to form a turnup which limits the upward movement of the opening buffer block (14).
2. The flexible quick breaker driving mechanism according to claim 1, wherein a fixed end cover (25) abutting against the lower end of the opening buffer spring (22) is mounted on the lower side of the lower end cover (15).
3. The flexible quick breaker driving mechanism according to claim 1, further comprising a buffer weight (7), wherein a guide member for guiding the buffer weight (7) vertically in a sliding manner is provided at an upper portion of the upper end cap (19); the upper part of the closing spring seat (18) is provided with a supporting block (8) which impacts the buffering balancing weight (7).
4. A flexible quick breaker actuating mechanism according to claim 3, characterized in that the guide is provided with a stop for limiting the downward movement of the buffer weight (7).
5. The flexible quick breaker driving mechanism according to claim 1, wherein a magnetic shoe (12) is arranged between the closing coil (11) and the opening coil (23), and a transition iron ring (13) is arranged on the inner side of the magnetic shoe (12).
6. The flexible quick breaker driving mechanism according to claim 1, wherein the closing coil (11) includes a closing coil bobbin (1101), a closing main coil (1103) and a switching-off auxiliary coil (1102) wound on the closing coil bobbin (1101), and the number of turns of the closing main coil (1103) is larger than the number of turns of the switching-off auxiliary coil (1102); the opening coil (23) comprises an opening coil framework (2301), an opening main coil (2303) and a closing auxiliary coil (2302), wherein the opening main coil (2303) and the closing auxiliary coil (2302) are wound on the opening coil framework (2301), and the number of turns of the opening main coil (2303) is larger than that of the closing auxiliary coil (2302).
7. The flexible circuit breaker actuating mechanism of claim 1 wherein the lower portion of the plunger (20) is slidably received in the upper portion of the trip spring seat (24).
8. The flexible circuit breaker actuating mechanism of claim 1 wherein the closing spring seat (18) is a stainless steel non-magnetically conductive material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210054967.2A CN114420513B (en) | 2022-01-18 | 2022-01-18 | Flexible quick breaker driving mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210054967.2A CN114420513B (en) | 2022-01-18 | 2022-01-18 | Flexible quick breaker driving mechanism |
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| CN114420513A CN114420513A (en) | 2022-04-29 |
| CN114420513B true CN114420513B (en) | 2024-04-16 |
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| CN202210054967.2A Active CN114420513B (en) | 2022-01-18 | 2022-01-18 | Flexible quick breaker driving mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117524780B (en) * | 2024-01-05 | 2024-03-15 | 宁波天安智能电网科技股份有限公司 | Self-induction magnetic force assisted quick-separating mechanism and high-voltage switch |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201315271Y (en) * | 2008-12-19 | 2009-09-23 | 南京因泰莱配电自动化设备有限公司 | Bistable permanent magnetic operation mechanism |
| CN102184795A (en) * | 2011-04-12 | 2011-09-14 | 浙宝开关(杭州)有限公司 | Fast vacuum circuit breaker used for protecting high-power power electronic converter |
| CN210692466U (en) * | 2019-08-29 | 2020-06-05 | 常德威迪电气有限责任公司 | Strut type circuit breaker capable of being rapidly opened and closed |
| CN113035652A (en) * | 2021-04-16 | 2021-06-25 | 电光防爆科技股份有限公司 | Permanent magnetic mechanism |
-
2022
- 2022-01-18 CN CN202210054967.2A patent/CN114420513B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201315271Y (en) * | 2008-12-19 | 2009-09-23 | 南京因泰莱配电自动化设备有限公司 | Bistable permanent magnetic operation mechanism |
| CN102184795A (en) * | 2011-04-12 | 2011-09-14 | 浙宝开关(杭州)有限公司 | Fast vacuum circuit breaker used for protecting high-power power electronic converter |
| CN210692466U (en) * | 2019-08-29 | 2020-06-05 | 常德威迪电气有限责任公司 | Strut type circuit breaker capable of being rapidly opened and closed |
| CN113035652A (en) * | 2021-04-16 | 2021-06-25 | 电光防爆科技股份有限公司 | Permanent magnetic mechanism |
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