CN104021993B - The high-power contactor of a kind of self-locking low power consuming - Google Patents
The high-power contactor of a kind of self-locking low power consuming Download PDFInfo
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- CN104021993B CN104021993B CN201410276178.9A CN201410276178A CN104021993B CN 104021993 B CN104021993 B CN 104021993B CN 201410276178 A CN201410276178 A CN 201410276178A CN 104021993 B CN104021993 B CN 104021993B
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Abstract
The invention belongs to ground surface works technical field, be specifically related to a kind of electromagnetic self-locking formula contactor, it comprises electromagnetic self-locking mechanism, contactor mount holder [16], iron core [18], magnet exciting coil [22], the second armature [21], armature fixed mount [20], spring detent [23] and compression reseting spring [19].By the balance of multi-acting force, realize the firm design of the minimum energy dissipation of holding (out) coil, simple and reliable for structure, holding (out) coil power can be about 5% of magnet exciting coil, the energy-saving alternating current contactor formed the thus relative regular alternating current contactor that always consumes energy can reduce by more than 90%, solves the problems such as contactor heating, noise simultaneously.
Description
Technical field
The invention belongs to ground surface works technical field, be specifically related to the high-power contactor of a kind of electromagnetic self-locking formula low power consuming.
Background technology
Relate to when doing disjunction isolated controlling to the circuit of belt current load in electrical apparatus controlling system, the general A.C. contactor that adopts carries out connecting and cutting off.The operation principle of electromagnetic type self-recoverage contactor is as follows: after magnet exciting coil energising, produce magnetic flux and electromagnetic attraction in the core which.This electromagnetic attraction overcomes reactive spring force makes armature adhesive, drives contact mechanism action, and main normally opened contact closes, and connects circuit.During magnet exciting coil dead electricity, electromagnetic attraction is less than spring opposition, and armature is discharged, and contacts of contactor mechanism resets and breaks the connection of circuit.
Due to by the restriction of the piece volumes such as contact terminal and supporting electromagnetic mechanism, for big current disjunction required for A.C. contactor have comparatively macrostructure space requirement, and corresponding magnet exciting coil needs enough power to guarantee electromagnetic mechanism and contact action adhesive.Magnet exciting coil needs higher starting current adhesive armature, and after magnet exciting coil starts adhesive, rely on this coil to continue to power up the adhesive of maintenance armature.
The circuit for controlling motor of large load oil pumper generally adopts the high-power AC contactor of CJ20 series.During this Series Universal model A.C. contactor is installed and used in distribution box for oil pump unit, a large amount of problem of existence:
1, magnet exciting coil starts high consumption Model Design according to big current, when relatively maintaining armature adhesive, and power consumption relative surplus, the serious waste energy, and there is high general heating problem, accelerating coil ageing of insulation, reduce the life-span.
2, CJ20 Series AC Contactor answers at right angle setting, but our scene is all level installation without exception, has had a strong impact on the normal work of critical piece:
(1) armature belongs to sprung parts, and level installs tailheaviness skew, during adhesive armature bottom a lateral wearing after clash into secured core in advance, cause both contact end faces uneven, after long-time, armature can produce serious low-frequency vibration noise;
(2) equally for above-mentioned reasons, moving contact will occur not with the time of contact of determining contact
Synchronously, contact end face can not ensure counterpressure and speed, causes that contact is bad, electric arc burn and even burn.
(3) in contactor course of action, resistance to overturning declines, and resultant fault rises.
For above-mentioned reasons, current distribution box for oil pump unit internal cause damage and replacing to measure maximum electric equipment be exactly A.C. contactor, add great maintenance cost to enterprise every year.
Existing multiple energy-saving alternating current contactor patent at present, as CN2388703[saving device for alternating current contactor] be the secondary electromagnetic and mechanical design adopting inclination hook formation, its structure is more complicated, and design stability is poor, lacks maturity.CN2919508[energy-saving device for AC contactor] belong to the design adopting mechanical self-latching, electromagnetism unlocking manner, it is delayed that its defect is off action, and mechanical structure is easily stuck etc. makes poor reliability.Other technology is the improvement stressing automatically controlled mode and circuit then more, is not suitable for using in adverse circumstances such as high capacity, high vibrations, high dust.CN1107963C[mechanical self-latching type ac contact means] belong to employing mechanical self-latching, the design of mechanical release mode, its defect unlocks number of times latch hook too much can be caused to wear and tear, and cannot use.Material selec-tion uses containing cored coil, although increase the ability of absorption armature, the electric current resulting through coil due to the impact of transistor is direct current, time one is long, iron core from carrying magnetic, can cause moving armature and static gag bit to separate, A.C. contactor cannot be used.
Summary of the invention
For above prior art Problems existing, the invention provides a kind of novel high-power contactor of electromagnetic self-locking formula low power consuming, adopt the electromagnetic locking mechanism design of cramped construction, put forth effort the stable secondary self-locking solving contactor adhesive mechanism, to improve the reliability of system.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of self-lock contactor, comprises electromagnetic self-locking mechanism, contactor mount holder 16, iron core 18, magnet exciting coil 22, second armature 21, armature fixed mount 20, spring detent 23 and compression reseting spring 19; Electromagnetic self-locking mechanism is fixed on contactor mount holder bottom surface; Magnet exciting coil 22 and iron core 18 are fixed on contactor mount holder 16 end face; Second armature 21 is connected with armature fixed mount 20, and armature fixed mount 20 relies on the spring detent 23 at two ends to contact with the compression reseting spring 19 of inside, contactor mount holder 16 two side; Electromagnetic self-locking mechanism comprises lock pin bar 14, dead bolt 3, goring push spring 11, first armature 6, holding (out) coil 5; There is annular recess the front end of lock pin bar 14; Dead bolt 3 is U-shape lock tongue, and its inner ring side can embed with the front end ring-type fit depressions of lock pin bar 14; Contact with the first armature 6 after dead bolt 3 top press-in goring push spring 11; Holding (out) coil stator core mates with the first armature 6 position level is symmetrical; Lock pin bar 14, through contactor mount holder 16, iron core 18, is fixedly connected with the second armature 21.
Further, described electromagnetic self-locking mechanism also comprises lock body 1, and its top eccentric position has vertical through hole 25, for penetrating lock pin bar 14; There is the penetrating horizontal inside groove 26 in side its left side, and inside horizontal inside groove 26, sideline is the line positions such as the radius of vertical through hole 25; There are 2 symmetrical isometrical circles of horizontal direction parallel to run through hole slot 27, for penetrating dead bolt 3 in the inboard of horizontal inside groove 26; Hole slot 27 has spring channel 28 in lock body lateral direction, is used for installing goring push spring 11.
Further, the wear resistant nylon lining 7 that vertical through hole 25 inwall of described lock body 1 has fit clearance good, is used for adjusting the free gap of lock pin bar 14 in through hole 25.
Further, described magnet exciting coil and holding (out) coil use same power supply; Magnet exciting coil 22 accesses through power-off delay relay J1; Holding (out) coil 5 is directly in parallel to be accessed on contactor power circuit.
Further, described magnet exciting coil is vertical with the magnetic direction 90 ° of both holding (out) coils.
Further, described lock pin bar 14 adopts non-magnetic rustproof Steel material.
Utilize a control method for self-lock contactor, comprise the steps:
(1) when A.C. contactor is energized, magnet exciting coil 22 accesses through power-off delay relay J1; Holding (out) coil 5 is directly in parallel to be accessed on contactor power circuit; Magnet exciting coil 22 and holding (out) coil 5 use same power supply;
(2), during the adhesive of contactor power transmission, main magnet exciting coil 22 and holding (out) coil 5 power up adhesive; Dead bolt 3 is by the active force of goring push spring 11, and directly proceed to the groove area of lock pin bar 14, holding (out) coil 5 powers up adhesive first armature 6 and guarantees U-shape lock tongue 3 hold mode in the endless groove of lock pin bar 14;
(3) reach the power-off of main magnet exciting coil 22 by presetting delay cut-off relay J1 power-off time, electromagnetic self-locking mechanism is locked coil 5 and is locked by lock pin bar 14;
(4) when contactor needs to do rupturing operation, the interruption that contactor controls power supply input causes holding (out) coil 5 dead electricity, its adhesive active force disappears, U-shape lock tongue 3 deviates from the annular recess of lock pin bar 14, lock pin bar 14 is moved upward to rapidly stroke top dead-centre, and contacts of contactor mechanism completes separation cut operation.
Beneficial effect of the present invention is:
The present invention is by the balance of multi-acting force, realize the firm design of the minimum energy dissipation of holding (out) coil, simple and reliable for structure, holding (out) coil power can be about 5% of magnet exciting coil, the energy-saving alternating current contactor formed the thus relative regular alternating current contactor that always consumes energy can reduce by more than 90%, solves the problems such as contactor heating, noise simultaneously.
CJ20 series 150A, 250A, 400A ac contactor coil uses 380V to power, and through measuring adhesive instantaneous peak current 4.1A, static adhesive maintains electric current 0.23A (measured value), and namely power consumption is calculated as:
0.23A*380V*24h*365d=765.6kw/h (year);
High-power oil pumper energy-saving A.C. contactor possesses great application space, save owing to A.C. contactor to be maintained state adhesive power consumption, main magnet exciting coil only uses as instantaneous starting, the only 0.02A and holding (out) coil consumes energy, conservative measuring and calculating can reduce A.C. contactor power consumption more than 90%, A.C. contactor useful life more than 4 times can be improved simultaneously, greatly reduce low-voltage electrical apparatus maintenance cost.Use CJ20 series high-power contactor to calculate according to our factory 30% oil well, after popularization every year can saves energy more than 500,000 kilowatt hours, reduce low-voltage electrical apparatus maintenance cost simultaneously in a large number.
Accompanying drawing explanation
Fig. 1 is the top plan view of electromagnetic self-locking mechanism;
Fig. 2 is the three-view diagram of lock body structure;
Fig. 3 be electromagnetic self-locking mechanism look squarely profile;
Fig. 4 is the unlock state figure of electromagnetic self-locking mechanism when contactor main body is installed;
Fig. 5 is the lock-out state figure of electromagnetic self-locking mechanism when contactor main body is installed;
Fig. 6 is the Control timing sequence figure of contactor magnet exciting coil and holding (out) coil;
Fig. 7 is system wiring schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention is described:
Accompanying drawing 1 is the top plan view of electromagnetic self-locking mechanism, and as shown in the figure, electromagnetic self-locking mechanism comprises lock body 1, lock pin bar 14, dead bolt 3, goring push spring 11, first armature 6, holding (out) coil 5 and holding (out) coil support 4.
Wherein lock body 1 as shown in Figure 2, and be the integrated metal parts of three TV structures, its top eccentric position has vertical through hole 25, for penetrating lock pin bar 14; It looks squarely direction end face the penetrating horizontal inside groove 26 in side, and inside it, sideline is the line positions such as the radius of vertical through hole 25; There are 2 symmetrical isometrical circles of horizontal direction parallel to run through hole slot 27, for penetrating U-shape lock tongue 3 in the inboard of horizontal inside groove 26; Hole slot 27 has spring channel 28 in lock body lateral direction, is used for installing goring push spring 11; Respectively there is the installation screw 29 of 2 groups of corresponding set bolts 12 horizontal direction both sides, lock body one end, are used for fixing holding (out) coil support 4; Symmetrical extension side-strip structure is arranged at the top of lock body, and has 4 installation screws 2, for lock body 1 is arranged on A.C. contactor respective base;
As shown in Figure 1, the wear resistant nylon lining 7 that vertical through hole 25 inwall of lock body 1 has fit clearance good, is used for adjusting the free gap of lock pin bar 14 in through hole 25; There is annular recess the front end of lock pin bar 14; The top of U-shape lock tongue 3 is inserted by horizontal inside groove 26 side of lock body 1 and is run through hole slot 27 and pass, and the inner ring side of U-shape lock tongue can embed with the front end ring-type fit depressions of lock pin bar 14; Fastening by bolt 9 and armature fixed head 8 after dead bolt 3 top press-in goring push spring 11; First armature 6 is silicon steel sheet armature, with fixing ear, is assemblied on armature fixed head 8 by the rivet 13 and bolt 9 running through armature 6; Article 4, holding (out) coil support 4 and lock body 1 are fixed by set bolt 12; There is the holding (out) coil 5 connected by bolt 10 the inner of holding (out) coil support 4, and the stator core of coil mates with the first armature 6 position level is symmetrical.
Accompanying drawing 3 is the profile of looking squarely of the lock-out state of electromagnetic self-locking mechanism, and scheme visible lock pin bar 14 thus after arrival latched position, the annular recess of the front end of lock pin bar 14 is in the position of opening of horizontal inside groove 26, and match with the inner ring side of U-shape lock tongue embeds simultaneously; The armature 9 be connected with U-shape lock tongue is close with holding (out) coil 5 and reaches the summit of attracting state under the effect of goring push spring 11.
The high-power contactor of a kind of self-locking low power consuming, comprises electromagnetic self-locking mechanism, contactor mount holder 16, iron core 18, magnet exciting coil 22, second armature 21, armature fixed mount 20, spring detent 23 and compression reseting spring 19.
Accompanying drawing 4 is the unlock state figure of electromagnetic self-locking mechanism after contactor main body is installed, and bolt 15 is fixed in the corresponding vertical base of contactor by the screw 2 on lock body 1; It is inner that magnet exciting coil (main actuating coil) 22 and iron core (stator) 18 are fixed on contactor mount holder 16 by screw 17; Iron core (stator) 18 central point has through hole, is used for through lock pin bar 14, and lock pin bar 14 is fixedly connected with through screw thread with the second armature 21 by this hole; The fixing lever pin 24 connected for same contact mechanism is arranged at the top of armature fixed mount 20; Second armature 21 on top is connected with armature fixed mount 20, and armature fixed mount 20 relies on the spring detent 23 at two ends to contact with compression reseting spring 19, and the release action power relying on it to produce maintains the released state of iron core 18 and the second armature 21; Under released state, rely on compression reseting spring 19 to support armature 21 to move up, open with magnet exciting coil (main actuating coil) 22 and iron core (stator) 18 points, and tractive lock pin bar 14 moving the constraint of U-shape lock tongue 3,3, U-shape lock tongue is extruded the slot opening scope of lock pin bar 14.
Accompanying drawing 5 is the lock-out state figure of electromagnetic self-locking mechanism after contactor main body is installed, second armature 21 on top is subject to the suction impact produced after magnet exciting coil 22 powers on, exceed the opposition that compression reseting spring 19 provides, move down tractive armature fixed mount 20 and contact mechanism arrival bottom of stroke, promote lock pin bar 14 move down and make recess region enter the corresponding interval of inner ring of U-shape lock tongue 3 simultaneously, U-shape lock tongue 3 is pulled the groove area entering lock pin bar 14 by goring push spring 11, and the first armature 6 making the U-shape lock tongue other end install is close to effective adhesive operating distance with holding (out) coil 5.
Accompanying drawing 6 is the Control timing sequence figure of contactor magnet exciting coil and holding (out) coil, and accompanying drawing 7 is system wiring schematic diagram.When A.C. contactor is energized, magnet exciting coil 22 (L1) accesses through power-off delay relay J1; Holding (out) coil 5 (L2) is directly in parallel to be accessed on contactor power circuit; Two groups of coils use same power supply; During the adhesive of contactor power transmission, main magnet exciting coil 22 and holding (out) coil 5 power up adhesive; Lock pin bar 14 is by the active force of goring push spring 11, and directly proceed to the groove area of lock pin bar 14, holding (out) coil 5 powers up adhesive first armature 6 and guarantees U-shape lock tongue 3 hold mode in the endless groove of lock pin bar 14; Reach the power-off of main magnet exciting coil 22 by presetting delay cut-off relay L1 power-off time, mechanical structure portion is locked coil 5 and is locked by lock pin bar 14; Can be seen by sequential chart, maintaining the synchronous control mode of system cloud gray model is operating time that powers up of holding (out) coil 5 equal contactor main contacts adhesive running time.
Comprehensive said structure, is described further design principle of the present invention by reference to the accompanying drawings:
U-shape lock tongue 3, by the pulling function power F2 of goring push spring 11, maintains the oppressive force F1 to lock pin bar 14 vertical direction, namely shows as F1=F2; Have surface contact friction power f6 between the annular recess surface texture of lock pin bar 14 and U-shape lock tongue 3, can produce F1 and hinder impact; Lock pin bar 14 can be drawn out to top dead-centre, i.e. F3 > F1+f6 by the reversal interlocking relay F3 that lock pin bar 14 active force upwards and compression reseting spring 19 provide under unlock state; When contactor works, magnet exciting coil 22 powers up and produces startup the suction-combining force F4 to the second armature 21, and during F4-(F1+f6) > F3, then the second armature 21 drives a whole set of contact mechanism to arrive lock pin bar 14 bottom of stroke after extruding compression reseting spring 19; Because holding (out) coil 5 obtains the power-up procedures synchronous with magnet exciting coil 22, but it produces suction F5 does by distance more weak to the first armature 6, is not enough to make U-shape lock tongue 3 stop the movement of lock pin bar 14; U-shape lock tongue 3 slips in the annular recess of lock pin bar 14 correspondence by the F2 pulling function of goring push spring 11, first armature 6 of its front end connection simultaneously close to the effective the suction-combining force F5 of rear formation, namely reaches F5+F2+f6 (annular recess skin-friction force) > F3 with holding (out) coil 5; After time delay in some seconds, magnet exciting coil 22 is controlled dead electricity by delay cut-off relay J1, F4 active force disappears, holding (out) coil 5 continues to maintain energising attracting state, namely F5 keeps existence, dependence F5+F2+f6 > F3 does use, whole secondary electromagnetic locking mechanism maintains the firm locking to lock pin bar 14, achieves and replaces the high power consumption of magnet exciting coil 22 to maintain the work object of contactor adhesive with the low power consumption of holding (out) coil 5.
When contactor needs to do rupturing operation, the interruption that contactor controls power supply input causes holding (out) coil 5 dead electricity, and its adhesive directed force F 5 disappears, then F1 (F2)+f6 < F3; U-shape lock tongue 3 deviates from the annular recess of lock pin bar 14, and lock pin bar 14 is moved upward to rapidly stroke top dead-centre under F3 active force, and contacts of contactor mechanism completes separation cut operation.
Because lock pin bar 14 is in the magnetic field that magnet exciting coil 22 and the second armature 21 are formed, therefore magnetism-free stainless steel to be adopted on Material selec-tion to process, to reduce adhesive flux loss and impact.2 groups of solenoids due to the isolation of metal base plate vertical with the magnetic direction 90 ° of the two and have an impact hardly.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, all within principle of the present invention and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. an electromagnetic self-locking formula contactor, is characterized in that: comprise electromagnetic self-locking mechanism, contactor mount holder [16], iron core [18], magnet exciting coil [22], the second armature [21], armature fixed mount [20], spring detent [23] and compression reseting spring [19]; Electromagnetic self-locking mechanism is fixed on contactor mount holder bottom surface; Magnet exciting coil [22] and iron core [18] are fixed on contactor mount holder [16] end face; Second armature [21] is connected with armature fixed mount [20], and armature fixed mount [20] relies on the spring detent [23] at two ends to contact with the compression reseting spring [19] of contactor mount holder [16] inside, two side; Electromagnetic self-locking mechanism comprises lock pin bar [14], dead bolt [3], goring push spring [11], the first armature [6], holding (out) coil [5]; There is annular recess the front end of lock pin bar [14]; Dead bolt [3] is U-shape lock tongue, and its inner ring side can embed with the front end ring-type fit depressions of lock pin bar [14]; Dead bolt [3] top press-in goring push spring [11] contacts with the first armature [6] afterwards; Holding (out) coil [5] mates with the first armature [6] position level is symmetrical; Lock pin bar [14], through contactor mount holder [16], iron core [18], is fixedly connected with the second armature [21]; The two magnetic direction 90 ° of described magnet exciting coil [22] and holding (out) coil [5] is vertical.
2. electromagnetic self-locking formula contactor as claimed in claim 1, described electromagnetic self-locking mechanism also comprises lock body [1], and its top eccentric position has vertical through hole [25], for penetrating lock pin bar [14]; There is the penetrating horizontal inside groove [26] in side its left side, and sideline, horizontal inside groove [26] inner side is the line positions such as the radius of vertical through hole [25]; There are 2 symmetrical isometrical circles of horizontal direction parallel to run through hole slot [27], for penetrating dead bolt [3] in the inboard of horizontal inside groove [26]; Hole slot [27] has spring channel [28] in lock body lateral direction, is used for installing goring push spring [11].
3. electromagnetic self-locking formula contactor as claimed in claim 2, the wear resistant nylon lining [7] that vertical through hole [25] inwall of described lock body [1] has fit clearance good, is used for adjusting lock pin bar [14] free gap in through hole [25].
4. the electromagnetic self-locking formula contactor as described in as arbitrary in claim 1-3, described magnet exciting coil and holding (out) coil use same power supply; Magnet exciting coil [22] accesses through power-off delay relay J1; Holding (out) coil [5] is directly in parallel to be accessed on contactor power circuit.
5. electromagnetic self-locking formula contactor as claimed in claim 4, described lock pin bar [14] adopts non-magnetic rustproof Steel material.
6. utilize a control method for electromagnetic self-locking formula controller, it comprises the steps:
(1) when A.C. contactor is energized, magnet exciting coil [22] accesses through power-off delay relay J1; Holding (out) coil [5] is directly in parallel to be accessed on contactor power circuit; Magnet exciting coil [22] and holding (out) coil [5] use same power supply;
(2), during the adhesive of contactor power transmission, main magnet exciting coil [22] and holding (out) coil [5] power up adhesive; Lock pin bar [14] is by the active force of goring push spring [11], directly proceed to the groove area of lock pin bar [14], holding (out) coil [5] powers up adhesive first armature [6] and guarantees U-shape lock tongue [3] hold mode in the endless groove of lock pin bar [14];
(3) reach main magnet exciting coil [22] power-off by presetting delay cut-off relay J1 power-off time, electromagnetic self-locking mechanism is locked coil [5] and is locked by lock pin bar [14];
(4) when contactor needs to do rupturing operation, the interruption that contactor controls power supply input causes holding (out) coil [5] dead electricity, its adhesive active force disappears, U-shape lock tongue [3] deviates from the annular recess of lock pin bar [14] by the effect of goring push spring [11], lock pin bar [14] is moved upward to rapidly stroke top dead-centre, and contacts of contactor mechanism completes separation cut operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410276178.9A CN104021993B (en) | 2014-06-19 | 2014-06-19 | The high-power contactor of a kind of self-locking low power consuming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410276178.9A CN104021993B (en) | 2014-06-19 | 2014-06-19 | The high-power contactor of a kind of self-locking low power consuming |
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| CN104021993A CN104021993A (en) | 2014-09-03 |
| CN104021993B true CN104021993B (en) | 2015-11-18 |
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| CN201410276178.9A Expired - Fee Related CN104021993B (en) | 2014-06-19 | 2014-06-19 | The high-power contactor of a kind of self-locking low power consuming |
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| CN104407530B (en) * | 2014-11-29 | 2017-05-03 | 广东宏日科技股份有限公司 | Off-delay switching device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201820710U (en) * | 2010-10-22 | 2011-05-04 | 何东 | Novel contactor |
| CN102412098A (en) * | 2011-09-23 | 2012-04-11 | 张汉全 | Energy-saving alternating-current contactor with fault clearing lock |
| CN203950746U (en) * | 2014-06-19 | 2014-11-19 | 东北石油大学 | The high-power contactor of a kind of self-locking low power consuming |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7402795U (en) * | 1974-01-28 | 1974-04-25 | Bbc Ag | Electromagnetic contactor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201820710U (en) * | 2010-10-22 | 2011-05-04 | 何东 | Novel contactor |
| CN102412098A (en) * | 2011-09-23 | 2012-04-11 | 张汉全 | Energy-saving alternating-current contactor with fault clearing lock |
| CN203950746U (en) * | 2014-06-19 | 2014-11-19 | 东北石油大学 | The high-power contactor of a kind of self-locking low power consuming |
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Inventor after: Bai Mingxing Inventor after: Song Kaoping Inventor after: Liu Bin Inventor after: Zhang Jicheng Inventor after: Yang Erlong Inventor after: Wang Huzhen Inventor before: Bai Mingxing Inventor before: Song Kaoping Inventor before: Zhang Jicheng Inventor before: Yang Erlong Inventor before: Dan Wuyi Inventor before: Wang Huzhen |
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Free format text: CORRECT: INVENTOR; FROM: BAI MINGXING SONG KAOPING ZHANG JICHENG YANG ERLONG DAN WUYI WANG HUZHEN TO: BAI MINGXING SONG KAOPING LIU BIN ZHANG JICHENG YANG ERLONG WANG HUZHEN |
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