CN110504117B - T-shaped symmetrical double-helix self-excitation magnetic quenching device - Google Patents
T-shaped symmetrical double-helix self-excitation magnetic quenching device Download PDFInfo
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- CN110504117B CN110504117B CN201910793513.5A CN201910793513A CN110504117B CN 110504117 B CN110504117 B CN 110504117B CN 201910793513 A CN201910793513 A CN 201910793513A CN 110504117 B CN110504117 B CN 110504117B
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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
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a T-shaped symmetrical double-helix self-excitation magnetic quenching device, which comprises conducting bars which are oppositely and symmetrically arranged, wherein the lower ends of the conducting bars are respectively connected with a front arc striking bar and a rear arc striking bar; the excitation spiral row is sleeved with an excitation iron core, two ends of the excitation iron core are respectively connected with the magnetic conduction connecting plate, and the upper end of the magnetic conduction connecting plate is abutted to the bottom of the front arc striking row. The direct current quick circuit breaker can solve the problems of poor breaking capacity and poor arc blowing effect of the direct current quick circuit breaker in the prior art, and is high in breaking capacity, long in service life and high in reliability.
Description
Technical Field
The invention relates to a switching device, in particular to a T-shaped symmetrical double-helix self-excitation magnetic quenching device.
Background
At present, a direct current power supply system is adopted in many important industries such as urban rail transit, mines, metallurgy, ship electricity and the like in China. As the most important protection device in the dc power supply system, the dc fast breaker must have the capability of reliably switching on and off normal and abnormal currents (e.g., short circuit), and must also meet the temperature requirements for long-term operation. With the increasing of the capacity of the direct current power supply load, the current of a system in short-circuit fault often reaches nearly hundred kiloamperes, the high-capacity direct current quick circuit breaker is extremely difficult to open and close, and meanwhile, high requirements are provided for the capacity, speed and reliability of the direct current circuit breaker for cutting off the short-circuit current.
The direct current circuit breaker is a key element for breaking a fault line and protecting electrical equipment, and the breaking performance of the direct current circuit breaker is the most important and basic technical index for representing the operation characteristics. The electrical service life of a circuit breaker is popularly called the service life of the circuit breaker and refers to the reliable on-off times of the circuit breaker when rated current passes through the circuit breaker. When the switch is switched off, electric arcs can be generated on the moving contact and the static contact, and the electric arcs can cause the abrasion of contact materials, so that the electric service life of the circuit breaker is reduced.
The existing direct current quick circuit breaker has the following four main defects:
firstly, with the continuous increase of the load capacity of the direct current power supply, the current of the system during short-circuit fault often reaches nearly hundred kiloamperes, the on-off of the circuit breaker becomes abnormal difficult, and most of the circuit breakers of the current products at home and abroad only have 80kA on-off capacity, so that the on-off requirement of the current direct current power supply system on the circuit breaker is difficult to meet.
And secondly, the arc blowing effect of the magnetic arc blowing and extinguishing system is that when the system generates large fault current, the arc blowing effect of the existing magnetic arc blowing system is difficult to make the direct current breaker normally open.
And thirdly, when fault current frequently occurs, the tripping times of the circuit breaker are increased, and higher requirements are provided for the mechanical life and the electrical life of the circuit breaker. Improving the mechanical and electrical life of circuit breakers has also been a trend in the circuit breaker industry.
Fourthly, the circuit breaker has high requirements on the material aspect, and how to select and manufacture the material meeting the use condition and how to detect whether the part material is qualified is also one of the difficulties.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the T-shaped symmetrical double-helix self-excitation magnetic quenching device which can solve the problems of poor breaking capacity and poor arc blowing effect of the direct current quick breaker in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the T-shaped symmetrical double-helix self-excitation magnetic quenching device comprises conducting bars which are symmetrically arranged relatively, the lower ends of the conducting bars are respectively connected with a front arc striking bar and a rear arc striking bar, the lower end of the rear arc striking bar is connected with a fixed contact, the lower end of the front arc striking bar is connected with one end of an excitation spiral bar, and the other end of the excitation spiral bar is connected with a lower bus bar through a return bar; an excitation iron core is sleeved in the excitation spiral row, two ends of the excitation iron core are respectively connected with a magnetic conduction connecting plate, and the upper end of the magnetic conduction connecting plate is abutted against the bottom of the front arc striking row; a magnetic conduction plate is arranged between the front arc striking row and the rear arc striking row, and the lower part of the magnetic conduction plate is connected with a magnetic conduction connecting plate; a moving contact is arranged below the front arc striking row, the middle part of the moving contact is hinged with the side wall of the shell of the arc extinguishing device, the lower part of the fixed contact is connected with an upper outgoing line pile, and the lower part of the moving contact is connected with a lower outgoing line pile; the upper side of the magnetic conduction plate is provided with an arc extinguishing grid sheet.
In the above technical scheme, preferably, the magnetic conducting plate is perpendicular to the front arc striking row and the rear arc striking row.
In the above technical solution, preferably, there are two magnetic conduction plates, and the two magnetic conduction plates are symmetrical with respect to the central line connection surface of the front arc striking row and the rear arc striking row.
In the above technical scheme, preferably, the cross sections of the front arc striking row and the rear arc striking row are both in a zigzag shape, the upper parts and the middle parts of the front arc striking row and the rear arc striking row are perpendicular to each other, the middle parts of the front arc striking row and the rear arc striking row are located on the same horizontal plane, and the distance between the lower part of the front arc striking row and the rear arc striking row is smaller than the distance between the middle part of the front arc striking row and the rear arc striking row.
In the above technical solution, preferably, the lower end of the front arc striking row is bent backward, and the bent portion is connected to one end of the excitation spiral row.
In the above technical scheme, preferably, one side of the upper part of the moving contact deviating from the fixed contact is abutted with the shifting fork.
In the above technical solution, preferably, a stopper is disposed on one side of the upper portion of the movable contact, which is adjacent to the stationary contact.
In the above technical scheme, preferably, the upper end of the stop block is flush with the upper surface of the moving contact, and the height of the lower end of the stop block is the same as that of the lower end of the rear arc striking row.
In the above technical scheme, preferably, the excitation spiral row is of a double-spiral structure, and the magnetic conduction plate is T-shaped.
In the above technical scheme, preferably, the shifting fork and the stop block are made of high-strength alloy steel materials; the moving contact and the static contact are made of silver-based alloy; the shell is made of a high-performance SMC composite material.
The T-shaped symmetrical double-helix self-excitation magnetic quenching device provided by the invention has the main beneficial effects that:
the back arc striking row and the static contact form a static contact assembly, and the front arc striking row and the excitation spiral row form a magnetic blow assembly. When the static contact and the moving contact are in lap joint during normal work, working current flows in through the upper outlet pile and flows out through the static contact, the moving contact and the lower outlet pile in sequence, and therefore a main conductive circuit is formed.
When a fault occurs, the moving contact is pulled by the action of a magnetic field, the moving contact is separated from the fixed contact, an electric arc is generated, fault current passes through the rear arc striking row and the fixed contact, an excitation field is generated on the excitation iron core, the magnetic field is adjacent to the fixed contact and the moving contact, an upward arc pulling action force is formed on the electric arc generated by the separation of the fixed contact and the moving contact, and the electric arc is moved upwards to the front arc striking row and the rear arc striking row from the fixed contact and the moving contact.
The electric arc jumps to the front arc striking row and then flows through the excitation spiral row, one part enters the lower bus bar through the return row, the other part is conducted to the magnetic conduction plates through the excitation iron core and the magnetic conduction connecting plates, a magnetic field is generated between the two magnetic conduction plates, the magnetic field attracts the electric arc and rapidly drives the arc root to move upwards along the front arc striking row and the rear arc striking row, and as the distance between the lower part of the front arc striking row and the rear arc striking row is smaller than the distance between the middle part of the front arc striking row and the rear arc striking row, the electric arc is elongated and is rapidly guided to enter the arc extinguishing grid sheet, the arc extinguishing grid sheet divides the electric arc into a plurality of sections to generate constant overvoltage, so that the electric arc is rapidly extinguished in a very short time, and the fault current breaking; which then flows with the current through the conducting bar.
Therefore, the rear arc striking bar, the front arc striking bar, the excitation spiral bar and the return bar form an excitation fault current loop, the excitation iron core, the magnetic conduction connecting plate and the T-shaped magnetic conduction plate form an excitation loop, and the excitation loop utilizes fault current generated by the main electric conduction loop, so that when the current is reversed, a magnetic field is reversed, and upward acting force on an electric arc is always kept, so that nonpolar bidirectional switching-on and switching-off are realized, the application range of the direct current quick breaker is remarkably improved, and the reliability is higher.
By arranging the excitation fault current loop, the closing and opening characteristics of the arc-extinguishing device under the short-circuit working condition are greatly improved to reach 100kA, and the requirements of the existing subway and other working conditions on the opening and closing capacity of the direct-current circuit breaker are met.
By separating the excitation fault current loop from the main conductive loop and realizing the arc extinguishing function through the excitation loop and the arc extinguishing grid pieces, the good arc extinguishing effect is ensured, the contact system of the circuit breaker is protected, and the reliability of the circuit breaker for realizing normal on-off of short-circuit current is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view of the connection of the return row to the various components.
Fig. 3 is a schematic view of the position relationship between the magnetic conductive connecting plate and the magnetic conductive plate.
The device comprises a front arc striking bar, a rear arc striking bar, a lower busbar, a movable contact, a stop block, a shift fork, a shifting fork, an upper outlet wire pile, a magnetic excitation spiral bar, a magnetic excitation iron core, a magnetic conduction plate, a magnetic conduction connecting plate, a return bar, a magnetic extinction grid sheet, a magnetic conduction bar and a magnetic conduction bar, wherein the front arc striking bar, the rear arc striking bar, the lower busbar, the moving contact, the stop block, the 32, the shift fork, the 33, the upper outlet wire pile.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, it is a schematic structural diagram of a T-shaped symmetrical double-helix self-excited magnetic quenching device.
The T-shaped symmetrical double-helix self-excitation magnetic quenching device comprises conductive bars 61 which are symmetrically arranged relatively, the lower ends of the conductive bars 61 are respectively connected with a front arc striking bar 1 and a rear arc striking bar 2, the lower end of the rear arc striking bar 2 is connected with a fixed contact, the lower end of the front arc striking bar 1 is connected with one end of an excitation helix bar 4, the excitation helix bars 4 are of a mutually symmetrical double-helix structure, and the other end of the excitation helix bar 4 is connected with a lower bus bar 22 through a return bar 52, as shown in figure 2; an excitation iron core 41 is sleeved in the excitation spiral row 4, two ends of the excitation iron core 41 are respectively connected with a magnetic conduction connecting plate 51, and the upper end of the magnetic conduction connecting plate 51 is abutted against the bottom of the front striking row 1; a magnetic conduction plate 5 is arranged between the front arc striking row 1 and the rear arc striking row 2, the magnetic conduction plate 5 is T-shaped, and the lower part of the magnetic conduction plate 5 is connected with a magnetic conduction connecting plate 51, which is shown in fig. 3; a movable contact 3 is arranged below the front arc striking bar 1, the middle part of the movable contact 3 is hinged with the side wall of the shell of the arc extinguishing device, the lower part of the fixed contact is connected with an upper outgoing line pile 33, and the lower part of the movable contact 3 is connected with a lower outgoing line pile; the upper side of the magnetic conduction plate 5 is provided with an arc extinguishing grid sheet 6.
Specifically, the magnetic conduction plate 5 is perpendicular to the front arc striking row 1 and the rear arc striking row 2. The number of the magnetic conduction plates 5 is two, and the two magnetic conduction plates are symmetrical about the connecting surface of the central lines of the front arc striking row 1 and the rear arc striking row 2.
The cross sections of the front arc striking row 1 and the rear arc striking row 2 are both in a zigzag shape, the upper parts and the middle parts of the front arc striking row 1 and the rear arc striking row 2 are respectively vertical to each other, the middle parts of the front arc striking row 1 and the rear arc striking row 2 are positioned on the same horizontal plane, and the distance between the lower part of the front arc striking row 1 and the lower end of the rear arc striking row 2 is smaller than the distance between the middle part of the front arc striking row 1 and the middle part of the rear arc striking row 2.
The lower end of the front arc striking row 1 is bent backwards, and the bent part is connected with the end part of the excitation spiral row 4.
The upper portion of the movable contact 3 is abutted against the shift fork 32 at a side deviating from the fixed contact. A stop 31 is arranged on one side of the upper part of the movable contact 3 adjacent to the fixed contact. The upper end of the block 31 is flush with the upper surface of the movable contact 3, and the height of the lower end of the block 31 is the same as that of the lower end of the back arc striking row 2. During normal operation, the stop block 31 is abutted with the rear arc striking row 2 adjacent to the fixed contact; when resetting from a fault, the fork 32 pushes the movable contacts 3 back to the position of contact with the rear striking row 2.
Preferably, the dc fast breaker that the arc control device that this scheme provided corresponds for adopting permanent magnetic mechanism to realize the divide-shut brake operation, and the electromagnetic mechanism of current circuit breaker adopts permanent magnetic material to carry out the magnetism to keep more, when the circuit breaker carries out the separating brake operation, need produce reverse magnetic field through solenoid, offset the magnetic field of permanent magnet, in frequent operation process, the demagnetization phenomenon can appear in the permanent magnet, and the holding power of closing a floodgate can reduce thereupon, has reduced the reliability of circuit breaker.
Preferably, the field core 41 is a ferrite material. Therefore, in the present embodiment, when a closing operation is performed, the electromagnetic coil, that is, the excitation spiral row 4 generates an electromagnetic field to drive the excitation core 41 to move and complete the closing operation, when the current of the excitation spiral row 4 is cut off, the external magnetic field disappears, and the magnetism of the excitation core 41 remains the same as that during saturation, and when a switching-off operation is performed, the excitation spiral row 4 generates a reverse magnetic field to demagnetize the excitation core 41, thereby implementing switching-off.
The traditional permanent magnet mechanism moves the movable iron core in the permanent magnet shell along the axis direction by changing the current direction of the electromagnetic coil, when the movable iron core moves to one end of the permanent magnet shell, the iron core is kept at the position through the attraction force of the permanent magnet, and the magnitude of the keeping force depends on the magnetic field intensity of the permanent magnet.
Preferably, the shifting fork 32 and the stopper 31 are made of high-strength alloy steel materials, and surface treatment is performed by adopting a special process, so that the parts have the characteristics of low internal stress, high toughness, good lubricity, high hardness, wear resistance and the like, and the mechanism can operate reliably. In the earlier-stage trial test and the type test of the circuit breaker, the mechanical life reaches more than 200000 times.
Preferably, the moving contact 3 and the static contact are made of silver-based alloy, a compact structure can be formed on the surface of the contact through a pre-oxidation-sintering-extrusion manufacturing process, the chemical stability is high, the corrosion resistance is high, the magnetic arc quenching system has high arc burning resistance, fusion welding resistance and the like, and can be matched with a self-designed magnetic arc quenching system to rapidly extinguish electric arcs, the electric service life of the circuit breaker can reach more than 1000 times, and the contact resistance of a main circuit is lower than 25 mu omega.
Preferably, the material of the shell is a high-performance SMC composite material, has extremely high strength, and has excellent electrical insulation performance, thermal stability and chemical resistance. The insulating parts of the main body frame adopt a flat plate type structure, the complexity of a compression molding die is reduced, and the major defect problems of material shortage, air holes and the like of the complex parts can be effectively avoided.
Preferably, the shell is of a plate structure, so that a compression molding process can be simplified, long fiber reinforced substances can be added into the material, and the comprehensive performance of the compression molded part is greatly improved. Modular design, each functional unit is completely independent, can assemble respectively, promotes work efficiency and product quality stability by a wide margin.
Preferably, the copper conductive part comprises a conductive bar 61, a front arc striking bar 1, a rear arc striking bar 2 and the like which are all forged, so that the processing performance of the material is improved, the size precision of the part is improved, and the strength and the conductivity of the conductive part are improved. The surface of the copper conductive piece is plated with silver, and the thickness of the silver plating is more than 12 mu m.
The above description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Claims (9)
1. A T-shaped symmetrical double-helix self-excitation magnetic quenching device is characterized by comprising conducting bars which are symmetrically arranged relatively, wherein the lower ends of the conducting bars are respectively connected with a front arc striking bar and a rear arc striking bar; an excitation iron core is sleeved in the excitation spiral row, two ends of the excitation iron core are respectively connected with a magnetic conduction connecting plate, and the upper end of the magnetic conduction connecting plate is abutted against the bottom of the front arc striking row; a magnetic conduction plate is arranged between the front arc striking row and the rear arc striking row, and the lower part of the magnetic conduction plate is connected with a magnetic conduction connecting plate; a moving contact is arranged below the front arc striking row, the middle part of the moving contact is hinged with the side wall of the shell of the arc extinguishing device, the lower part of the fixed contact is connected with an upper outgoing line pile, and the lower part of the moving contact is connected with a lower outgoing line pile; arc extinguishing grid pieces are arranged on the upper side of the magnetic conduction plate; the shifting fork and the stop block are made of high-strength alloy steel materials; the moving contact and the static contact are made of silver-based alloy; the shell is made of a high-performance SMC composite material.
2. The T-shaped symmetrical double helix self-energizing magnetic blowout device according to claim 1, wherein the magnetic conducting plate is perpendicular to the front arc striking bank and the rear arc striking bank.
3. The T-shaped symmetrical double helix self-energizing magnetic blowout device according to claim 2, wherein there are two magnetic conductive plates and the two magnetic conductive plates are symmetrical about the connection plane of the center lines of the front arc striking row and the rear arc striking row.
4. The T-type symmetrical double-helix self-excited magnetic blowout device according to claim 1, wherein the front arc striking row and the rear arc striking row are each zigzag-shaped in cross section, the upper portions and the middle portions of the front arc striking row and the rear arc striking row are perpendicular to each other, the middle portions of the front arc striking row and the rear arc striking row are located on the same horizontal plane, and the distance between the lower portion of the front arc striking row and the rear arc striking row is smaller than the distance between the middle portion of the front arc striking row and the rear arc striking row.
5. The T-shaped symmetrical double-helix self-excitation magnetic quenching device according to claim 4, wherein the lower end of the front arc striking row is bent backwards, and the bent part is connected with one end of the excitation spiral row.
6. The T-shaped symmetrical double helix self-excited magnetic quenching device according to claim 1, wherein the upper part of the moving contact is offset from one side of the static contact and is abutted with the shifting fork.
7. The T-shaped symmetrical double helix self-energizing magnetic quenching device according to claim 6 wherein the upper portion of the moving contact is provided with a stop adjacent to one side of the stationary contact.
8. The T-shaped symmetrical double helix self-excited magnetic quenching device according to claim 7, wherein the upper end of the stop block is flush with the upper surface of the movable contact, and the lower end of the stop block is at the same height as the lower end of the rear striking row.
9. The T-shaped symmetrical double-helix self-excited magnetic quenching device according to claim 1, wherein the excitation helix row is of a double-helix structure, and the magnetic conducting plate is T-shaped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910793513.5A CN110504117B (en) | 2019-08-27 | 2019-08-27 | T-shaped symmetrical double-helix self-excitation magnetic quenching device |
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| CN201910793513.5A CN110504117B (en) | 2019-08-27 | 2019-08-27 | T-shaped symmetrical double-helix self-excitation magnetic quenching device |
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| CN110504117A CN110504117A (en) | 2019-11-26 |
| CN110504117B true CN110504117B (en) | 2021-07-06 |
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| CN113889380A (en) * | 2021-09-07 | 2022-01-04 | 杭州德睿达电气有限公司 | Small-size direct current quick circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86204642U (en) * | 1986-09-17 | 1987-06-24 | 上海立新电器厂 | Direct-current magnetic field circuit breaker |
| CN102436975A (en) * | 2011-10-06 | 2012-05-02 | 武汉长海电气科技开发有限公司 | Bipolar DC contactor |
| US8809721B2 (en) * | 2007-01-18 | 2014-08-19 | Siemens Aktiengesellschaft | Quenching element, quenching unit, quenching and plugging unit, and switching device |
| CN207338256U (en) * | 2017-08-23 | 2018-05-08 | 武汉长海电气科技开发有限公司 | A kind of high-voltage DC contactor |
| CN111584322A (en) * | 2019-05-21 | 2020-08-25 | 杭州德睿达电气有限公司 | Direct-current high-breaking magnetic blow-out quick circuit breaker |
-
2019
- 2019-08-27 CN CN201910793513.5A patent/CN110504117B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86204642U (en) * | 1986-09-17 | 1987-06-24 | 上海立新电器厂 | Direct-current magnetic field circuit breaker |
| US8809721B2 (en) * | 2007-01-18 | 2014-08-19 | Siemens Aktiengesellschaft | Quenching element, quenching unit, quenching and plugging unit, and switching device |
| CN102436975A (en) * | 2011-10-06 | 2012-05-02 | 武汉长海电气科技开发有限公司 | Bipolar DC contactor |
| CN207338256U (en) * | 2017-08-23 | 2018-05-08 | 武汉长海电气科技开发有限公司 | A kind of high-voltage DC contactor |
| CN111584322A (en) * | 2019-05-21 | 2020-08-25 | 杭州德睿达电气有限公司 | Direct-current high-breaking magnetic blow-out quick circuit breaker |
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