CN102592890A - Non-polar hydrogen mixed gas DC (direct-current) arc extinction system for DC contactor - Google Patents
Non-polar hydrogen mixed gas DC (direct-current) arc extinction system for DC contactor Download PDFInfo
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- CN102592890A CN102592890A CN2012100389222A CN201210038922A CN102592890A CN 102592890 A CN102592890 A CN 102592890A CN 2012100389222 A CN2012100389222 A CN 2012100389222A CN 201210038922 A CN201210038922 A CN 201210038922A CN 102592890 A CN102592890 A CN 102592890A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H50/023—Details concerning sealing, e.g. sealing casing with resin
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H50/023—Details concerning sealing, e.g. sealing casing with resin
- H01H2050/025—Details concerning sealing, e.g. sealing casing with resin containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a non-polar hydrogen mixed gas DC (direct-current) arc extinction system for a DC contactor. The DC arc extinction system comprises a moving contact, four pairs of moving and static arc striking contacts, a static contact, a grid group and a permanent magnet. The non-polar hydrogen mixed gas DC arc extinction system is non-polar, namely the arc extinguishing property can not be influenced by the change of the current direction. According to the non-polar hydrogen mixed gas DC arc extinction system, the arc striking contacts strike electric arc to smoothly move along a track of the arc striking contacts, the arc striking contacts, the grid group and the permanent magnet are reasonably arranged, and the electric arc between the moving contact and the static contact is better and rapidly extinguished, thus the short circuit caused by sudden reversing of current is solved, and the breaking capacity is further improved. Hydrogen or a hydrogen mixed gas can be inflated into the non-polar hydrogen mixed gas DC arc extinction system for realizing arc extinguishing.
Description
Technical field
The present invention relates to a kind of arc quenching system of D.C. contactor, specifically, be meant to relate to a kind of system that the hydrogen used in the non-polar D.C. contactor or hydrogen gas mixture carry out arc extinguishing that has.
Background technology
D.C. contactor is mainly used in that remote connection and disjunction DC circuit and frequent makes that DC motor starts, stops, counter-rotating and plug braking.
The cardinal principle of D.C. contactor: the solenoid energising, armature and iron core adhesive, the reaction force drive moving contact that the suction of electromagnetic system overcomes spring contacts with fixed contact, and main circuit is connected; Solenoid cuts off the power supply, and the reaction force of spring drives armature and moving contact separates, and the electric arc that the contact disconnection produces in arc control device, receives magnetic quenching and the electric power driving is elongated, and cooling goes to dissociate and extinguish strongly, and main circuit is cut off.The design of a contactor should comprise three parts: the design of the design of contact system, the design of electromagnetic system, arc quenching system.
At number of patent application 201110057695.3; March 10 2011 applying date; Disclose a kind of nonpolarity D.C. contactor arc quenching system in the denomination of invention " nonpolarity D.C. contactor arc quenching system ", said system comprises moving contact, fixed contact, first permanent magnet, second permanent magnet and the 3rd permanent magnet; The centre of first contact and second contact is provided with second permanent magnet; The arranged outside of first contact has first permanent magnet; The arranged outside of second contact has the 3rd permanent magnet; First permanent magnet, first contact, the 3rd contact, second permanent magnet, second contact, the 4th contact and the 3rd permanent magnet clearance space are provided with, and the adjacent pole polarity of first permanent magnet, second permanent magnet and the 3rd permanent magnet is opposite.When the magnetic field that first permanent magnet of the present invention and second permanent magnet form pulls to a side with the electric arc that produces between first contact and the 3rd contact; The magnetic field that the 3rd permanent magnet and second permanent magnet form pulls to an opposing side with the electric arc that produces between second contact of moving contact and the 4th contact, guaranteed that the spray arc direction of the electric arc that two moving contacts produce is opposite fully.
Present direct current arc extinguishing has natural arc extinguishing, metal gate sheet arc extinguishing, vacuum extinction, pressed gas arc extinguishing, self magnetic blow-out bond grid sheet arc extinguishing, permanent magnetism magnetic quenching, pressed gas to combine the permanent magnetism magnetic quenching.Said method has its pluses and minuses separately, but all has the shortcoming that polarity is arranged, and can not realize that positive counter current all can energising work on switch.
Summary of the invention
The objective of the invention is to propose a kind ofly can guide that electric arc gets into the hydrogen direct current arc quenching system that grid sheet group reaches faster extinguishing arc between D.C. contactor two contacts under the action of a magnetic field, and this arc quenching system has been realized nonpolarity.Be that electric arc is towards movement outside; Electric arc is outwards motion under the effect of permanent magnet field, electric arc is elongated, and the while is by the guiding entering outside grid sheet group of outside striking contact; Be cut into a plurality of short arcs when electric arc is elongated again, thereby reach the effect of rapid extinguish arcs.When electric arc inwards moved, electric arc received the action of a magnetic field equally and is elongated, and got into inboard grid sheet group by inboard striking contact guiding, same extinguish arcs.
The technical scheme that the present invention adopts is: a kind of nonpolarity direct current arc quenching system that is applicable to D.C. contactor comprises moving contact, moving striking contact, fixed contact, quiet striking contact, outside grid sheet group, inboard grid sheet group, permanent magnet, dividing plate.
When electric arc moved under extraneous the action of a magnetic field, arc motion speed and external magnetic field intensity and gas medium and pressure were relevant.Based on the present invention design, the striking contact helps pilot arc and gets into grid sheet group, also can increase the effect of subdividing the arc simultaneously, and the striking contact selects copper tungsten material for use, and copper tungsten material has good advantages such as anti-arc erosion property, resistance fusion welding and high strength.Adopt double break point contact; When cut-offfing circuit, form the electric arc of two series connection, its pressure drop is the twice of single-break contact; Install the grid sheet group that is fan-shaped array additional on two arc gap both sides; ARC CUTTING is become a plurality of short arcs, and every section electric arc all has pressure drop, and the grid sheet can cool off electric arc to improve the arc potential gradient simultaneously.The externally-applied magnetic field permanent magnet improves arc motion speed; Elongating electric arc increases voltage, and additional back electromotive force, improves the dynamic voltage-current characteristic of electric arc through these measures of organic synthesis; Arc extinguishing ability when guaranteeing different electric current is unlikely to the arc extinguishing hyperenergia again and produces cut-off overvoltage when big electric current.Fill the hydrogen gas mixture of 1～5 atmospheric pressure different volumes ratio in the arc quenching system; The light weight of hydrogen, molecular motion speed is fast, conductive coefficient is high and characteristics such as medium recovery strength height; Make hydrogen compare other switches and have advantage clearly as the switch of switch arc-extinguishing medium; Hydrogen goes liberation strong, is beneficial to extinguish direct-current arc.
A kind of nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor of the present invention, this direct current arc quenching system includes load A electrode (3A), load B electrode (3B), inflating catheter (4), housing, grid chip module (7), contact assembly (8), magnetic blow-out assembly (9);
Said housing includes seal cover (2), dead ring (1) and insulation board (5); Be arranged with first conduit (11), second conduit on the inwall of said dead ring (1), first conduit (11) is used to install the first ring-shaped gate sheet group (7A), and second conduit is used to install the second ring-shaped gate sheet group (7B); Said seal cover (2) is provided with first through hole (2A) that is used for load A electrode (3A) and passes, be used for second through hole (2B) that load B electrode (3B) passes, be used for the third through-hole (2C) that inflating catheter (4) passes; The center of said insulation board (5) is provided with fourth hole (51), and said fourth hole (51) is used for touch spring support (6) one ends and passes; The other end of touch spring support (6) places the blind hole (931) of the dividing plate (93) of magnetic blow-out assembly (9); The bottom fitting insulating panels (5) of dead ring (1), seal cover (2) is installed at the top of dead ring (1); Be placed with grid chip module (7), contact assembly (8), magnetic blow-out assembly (9) in the dead ring (1); After in dead ring (1), placing grid chip module (7), contact assembly (8), magnetic blow-out assembly (9), remaining space is arcing chamber (4A);
Said grid chip module (7) includes the first ring-shaped gate sheet group (7A), the second ring-shaped gate sheet group (7B), the first arc grid sheet group (7C) and the second arc grid sheet group (7D); The first ring-shaped gate sheet group (7A) is identical with second ring-shaped gate sheet group (7B) structure; The first arc grid sheet group (7C) is identical with second arc grid sheet group (7D) structure;
The first arc grid sheet group (7C) is placed with the second arc grid sheet group (7D) relatively, and is installed in dividing plate (93) both sides of magnetic blow-out assembly (9); The first ring-shaped gate sheet group (7A) is placed with the second ring-shaped gate sheet group (7B) relatively, and is installed in first conduit (11), second conduit of dead ring (1) inwall; The arc limit of the first ring-shaped gate sheet group (7A) and the first arc grid sheet group (7C) is relative, and to be configured as with the contact center point be the conformal circle of first grid sheet (7E) in the center of circle; The arc limit of the second ring-shaped gate sheet group (7B) and the second arc grid sheet group (7D) is relative, and to be configured as with the contact center point be the conformal circle of the second grid sheet (7F) in the center of circle;
Said contact assembly (8) includes contact supporting (81), the fan-shaped contact of A (801), the fan-shaped contact of B (802), the fan-shaped contact of C (803), the fan-shaped contact of D (804), A rectangle contact (805), B rectangle contact (806), the fan-shaped contact of E (811), the fan-shaped contact of F (812), the fan-shaped contact of G (813), the fan-shaped contact of H (814), C rectangle contact (815), D rectangle contact (816);
Said contact supporting (81) is the U-shaped structure; The two ends of contact supporting (81) are provided with A support arm (83) and B support arm (84); Be transverse slat (85) between A support arm (83) and the B support arm (84), transverse slat (85) is provided with fifth hole (82), and fifth hole (82) is used for touch spring support (6) and passes; A support arm (83) is used for installing and supporting B rectangle contact (806), and B support arm (84) is used for installing and supporting D rectangle contact (816);
The both sides of said A rectangle contact (805) are equipped with fan-shaped contact of A (801) and the fan-shaped contact of B (802); A rectangle contact (805) is connected with an end of load A electrode (3A); The both sides of said B rectangle contact (806) are equipped with fan-shaped contact of C (803) and the fan-shaped contact of D (804); B rectangle contact (806) is installed on the A support arm (83) of contact supporting (81); The first contact gap (807) between A rectangle contact (805) and the B rectangle contact (806) is 1mm～10mm;
The both sides of said C rectangle contact (815) are equipped with fan-shaped contact of E (811) and the fan-shaped contact of F (812); C rectangle contact (815) is connected with an end of load B electrode (3B); The both sides of said D rectangle contact (816) are equipped with fan-shaped contact of G (813) and the fan-shaped contact of H (814); D rectangle contact (816) is installed on the B support arm (84) of contact supporting (81); The second contact gap (817) between C rectangle contact (815) and the D rectangle contact (816) is 1mm～10mm;
Said magnetic blow-out assembly (9) includes first permanent magnet (91), second permanent magnet (92) and dividing plate (93); The bottom of said dividing plate (93) is provided with blind hole (931), and said blind hole (931) is used to place the other end of touch spring support (6), and the other end of touch spring support (6) is stretched in said blind hole (931); The A plate face (932) of said dividing plate (93) is provided with the 3rd conduit (934), and said the 3rd conduit (934) is used to install the second arc grid sheet (7D); The B plate face (933) of said dividing plate (93) is provided with the 4th conduit (935), and said the 4th conduit (935) is used to install the first arc grid sheet (7C); Said dividing plate (93) is provided with the A rectangular opening (936) and confession second permanent magnet (92) that supply first permanent magnet (91) to pass and passes B rectangular opening (937); Between said A rectangular opening (936) and the said B rectangular opening (937) is conduit.
The advantage of the present invention is nonpolarity direct current arc quenching system is:
1. reasonable Arrangement of the present invention is organized grid sheet and permanent magnet more, makes that positive anti-polarity current all can energising work on switch, promptly realizes nonpolarity direct current arc extinguishing.
2. the present invention has adopted ring-shaped gate sheet monomer and the concyclic layout of arc grid sheet monomer, makes electric arc can contact rapidly with the grid sheet, and contact area is maximum, and the striking contact of design can get into this grid sheet group by pilot arc faster, thereby is beneficial to arc extinguishing more.
3. place the grid sheet group of copper tungsten material among the present invention, not only utilized the good characteristics such as anti-erosion of copper tungsten material, and just can be cut into the multistage short arc behind the electric arc entering grid sheet, reduce Arc Temperature and increased pressure drop simultaneously, improved arc voltage.
4. the present invention adopts circular-arc grid sheet, makes electric arc equated by the distance of contact to the motion of grid sheet, the time basically identical, thus the blow-out time is stable, and arc extinguishing becomes and is more prone to.
5. only need among the present invention to place two permanent magnets, behind load electrode end on-load voltage, the magnetic field that permanent magnet produces can quicken that electric arc gets in the grid sheet group between contact, has strengthened magnetic field intensity, plays and blows magnetic action.
6. selecting 1～5 atmospheric pressure hydrogen or hydrogen gas mixture for use in the arc control device of the present invention is arc-extinguishing medium, makes the direct current arc quenching system reach more excellent arc quenching effect.
7. adopt double break point contact; When cut-offfing circuit, form the electric arc of two groups of series connection, its pressure drop is the twice of single-break contact; Install the grid sheet group that is fan-shaped array additional on two arc gap both sides; ARC CUTTING is become a plurality of short arcs, and every section electric arc all has pressure drop, and the grid sheet can cool off electric arc to improve the arc potential gradient simultaneously.
8. load electrode terminals of the present invention are fixed in hull outside, and stube cable is convenient in this design.
9. middle shell of the present invention, seal cover, insulation board, grid sheet are circle, and project organization is compact, and volume is little, are convenient to processing, select the performance excellent material for use, have improved the useful life of arc quenching system.
10. direct current arc quenching system provided by the invention has reliable tightness and good environmental suitability, is applicable to Aeronautics and Astronautics and civilian low-voltage electrical apparatus.
Description of drawings
Fig. 1 is the external structure of the nonpolarity direct current arc quenching system of the present invention.
Figure 1A is the external structure at another visual angle of the nonpolarity direct current arc quenching system of the present invention.
Figure 1B is the exploded view of the nonpolarity direct current arc quenching system of the present invention.
Fig. 1 C is the axial section that waits of the nonpolarity direct current arc quenching system of the present invention.
Fig. 1 D is the vertical view of the unassembled seal cover of the nonpolarity direct current arc quenching system of the present invention.
Fig. 2 is the layout of grid chip module in the nonpolarity direct current arc quenching system of the present invention.
Fig. 2 A is the vertical view of grid chip module in the nonpolarity direct current arc quenching system of the present invention.
Fig. 3 is the structure chart of contact assembly in the nonpolarity direct current arc quenching system of the present invention.
Fig. 4 is the structure chart of magnetic blow-out assembly in the nonpolarity direct current arc quenching system of the present invention.
Fig. 5 is the voltage-current characteristic isoboles of the nonpolarity direct current arc quenching system of the present invention.
Fig. 5 A is that the electric arc of forward in the nonpolarity direct current arc quenching system of the present invention produces sketch map.
Fig. 5 B is that electric arc reverse in the nonpolarity direct current arc quenching system of the present invention produces sketch map.
Be numbered among the figure: 1. dead ring; 11. first conduit; 2. seal cover; 2A. first through hole; 2B. second through hole; 2C. third through-hole; 3A. load A electrode; 3B. load B electrode; 4. inflating catheter; 4A. arcing chamber; 5. insulation board; 51. fourth hole; 6. touch spring support; 7. grid chip module; 7A. the first ring-shaped gate sheet group; 7B. the second ring-shaped gate sheet group; 7C. the first arc grid sheet group; 7D. the second arc grid sheet group; 7E. the conformal circle of first grid sheet; 7F. the conformal circle of the second grid sheet; 701. first grid sheet monomer; 702. the second grid sheet monomer; 703. the 3rd grid sheet monomer; 704. the 4th grid sheet monomer; 8. contact assembly; 81. contact supporting; 82. fifth hole; 83.A support arm; 84.B support arm; 801.A fan-shaped contact; 802.B fan-shaped contact; 803.C fan-shaped contact; 804.D fan-shaped contact; 805.A rectangle contact; 806.B rectangle contact; 807. the first contact gap; 808. first electric arc; 811.E fan-shaped contact; 812.F fan-shaped contact; 813.G fan-shaped contact; 814.H fan-shaped contact; 815.C rectangle contact; 816.D rectangle contact; 817. the second contact gap; 818. second electric arc; 9. magnetic blow-out assembly; 91. first permanent magnet; 92. second permanent magnet; 93. dividing plate; 931. blind hole; 932.A plate face; 933.B plate face; 934. the 3rd conduit; 935. the 4th conduit; 936.A rectangular through-hole; 937.B rectangular through-hole.
Embodiment
To combine accompanying drawing and embodiment that the present invention is done further detailed description below.
Shown in Fig. 1, Figure 1A, Figure 1B, Fig. 1 C, Fig. 1 D; A kind of nonpolarity hydrogen gas mixture direct current arc quenching system that is applicable to D.C. contactor of the present invention, this direct current arc quenching system includes load A electrode 3A, load B electrode 3B, inflating catheter 4, housing, grid chip module 7, contact assembly 8, magnetic blow-out assembly 9.
(1) housing
Shown in Fig. 1, Figure 1A, Figure 1B, said housing includes seal cover 2, dead ring 1 and insulation board 5.
The center of said insulation board 5 is provided with fourth hole 51, and said fourth hole 51 is used for touch spring support 6 one ends and passes.The other end of touch spring support 6 places the blind hole 931 of the dividing plate 93 of magnetic blow-out assembly 9.
Said seal cover 2 is provided with the first through hole 2A that is used for load A electrode 3A and passes, be used for the second through hole 2B that load B electrode 3B passes, be used for the third through-hole 2C that inflating catheter 4 passes.
Be arranged with first conduit 11, second conduit (not shown among Figure 1B) on the inwall of said dead ring 1, first conduit 11 is used to install the first ring-shaped gate sheet group 7A, and second conduit is used to install the second ring-shaped gate sheet group 7B.
In the present invention, the bottom fitting insulating panels 5 of dead ring 1, seal cover 2 is installed at the top of dead ring 1.Shown in Fig. 1 C, Fig. 1 D, be placed with grid chip module 7, contact assembly 8, magnetic blow-out assembly 9 in the dead ring 1; After in dead ring 1, placing grid chip module 7, contact assembly 8, magnetic blow-out assembly 9, remaining space is arcing chamber 4A.
The rapidoprint of dead ring 1 can adopt nylon, PVC, melamine.
The rapidoprint of insulation board 5 can adopt nylon, PVC, melamine.
The rapidoprint of seal cover 2 can adopt glass, pottery.
(2) the grid chip module 7
Referring to Figure 1B, shown in Figure 2, said grid chip module 7 includes the first ring-shaped gate sheet group 7A, the second ring-shaped gate sheet group 7B, the first arc grid sheet group 7C and the second arc grid sheet group 7D; The first ring-shaped gate sheet group 7A is identical with the second ring-shaped gate sheet group 7B structure; The first arc grid sheet group 7C is identical with the second arc grid sheet group 7D structure;
In the present invention, ring-shaped gate sheet group (the first ring-shaped gate sheet group 7A, the second ring-shaped gate sheet group 7B) and arc grid sheet group (the first arc grid sheet group 7C and the second arc grid sheet group 7D) by a plurality of grid sheet monomers according to grid sheet arrangement pitches h longitudinally center line rearrange; Said grid sheet arrangement pitches h is equidistant, h=0.4mm～2.0mm.
Promptly the first ring-shaped gate sheet group 7A by a plurality of first grid sheet monomers 701 according to grid sheet arrangement pitches h longitudinally center line arrange;
Promptly the second ring-shaped gate sheet group 7B by a plurality of dried grid sheet monomers 702 according to grid sheet arrangement pitches h longitudinally center line arrange;
Promptly the first arc grid sheet group 7C by a plurality of the 3rd grid sheet monomers 703 according to grid sheet arrangement pitches h longitudinally center line arrange;
Promptly the second arc grid sheet group 7D by a plurality of the 4th grid sheet monomers 704 according to grid sheet arrangement pitches h longitudinally center line arrange.
The first arc grid sheet group 7C and the second arc grid sheet group 7D place relatively, and are installed in dividing plate 93 both sides of magnetic blow-out assembly 9.The first ring-shaped gate sheet group 7A and the second ring-shaped gate sheet group 7B place relatively, and are installed in first conduit 11, second conduit of dead ring 1 inwall.
The arc limit of the first ring-shaped gate sheet group 7A and the first arc grid sheet group 7C is relative, and to be configured as with the contact center point be the conformal round 7E of first grid sheet (like Fig. 2, Fig. 2 A) in the center of circle; The arc limit of the second ring-shaped gate sheet group 7B and the second arc grid sheet group 7D is relative, and to be configured as with the contact center point be the conformal round 7F of the second grid sheet (like Fig. 2, Fig. 2 A) in the center of circle.In order to realize that electric arc can contact rapidly with the grid sheet, and contact area is maximum, has adopted ring-shaped gate sheet monomer and the concyclic layout of arc grid sheet monomer.Because the randomness of arc motion adopts circular-arc grid sheet, make electric arc equate by the distance of contact to the motion of grid sheet, the time basically identical, thus the blow-out time is stable.
In the present invention, required grid sheet monoblock is counted M and is satisfied relation according to supply voltage U and electric arc by the hop count n (and n=M+1) of grid sheet cutting in the grid chip module 7
u
aRepresent the arc voltage in the first contact gap or the second contact gap, E representes the electric field strength of electric arc, and s representes arc length, u
0Expression electric arc is by every section arc voltage of grid sheet cutting.
In the present invention, grid sheet monomer adopts copper tungsten material.Like W80Cu.
(3) contact assembly 8
Referring to Figure 1B, shown in Figure 3, said contact assembly 8 includes the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of the fan-shaped contact of contact supporting 81, A 801, B 802, C 803, D 804, A rectangle contact 805, B rectangle contact 806, E 811, F 812, G 813, H 814, C rectangle contact 815, D rectangle contact 816.
Said contact supporting 81 is the U-shaped structure, and the two ends of contact supporting 81 are provided with A support arm 83 and B support arm 84, are transverse slats 85 between A support arm 83 and the B support arm 84, and transverse slat 85 is provided with fifth hole 82, and fifth hole 82 is used for touch spring support 6 and passes; A support arm 83 is used for installing and supporting B rectangle contact 806, and B support arm 84 is used for installing and supporting D rectangle contact 816.
The both sides of said A rectangle contact 805 are equipped with fan-shaped contact 801 of A and the fan-shaped contact 802 of B; A rectangle contact 805 is connected with the end of load A electrode 3A, another termination power of load A electrode 3A.Said A rectangle contact 805 adopts copper-based material or silver-based material, as: siller tin oxide.
The both sides of said B rectangle contact 806 are equipped with fan-shaped contact 803 of C and the fan-shaped contact 804 of D; B rectangle contact 806 is installed on the A support arm 83 of contact supporting 81.Said B rectangle contact 806 adopts copper product processing.Opening between A rectangle contact 805 and the B rectangle contact 806 apart from being 1mm～10mm.In the present invention, opening between A rectangle contact 805 and the B rectangle contact 806 apart from being called the first contact gap 807 (shown in Fig. 5 A).
The both sides of said C rectangle contact 815 are equipped with fan-shaped contact 811 of E and the fan-shaped contact 812 of F; C rectangle contact 815 is connected with the end of load B electrode 3B, another termination power of load B electrode 3B.Said C rectangle contact 815 adopts copper-based material or silver-based material, as: siller tin oxide.
The both sides of said D rectangle contact 816 are equipped with fan-shaped contact 813 of G and the fan-shaped contact 814 of H; D rectangle contact 816 is installed on the B support arm 84 of contact supporting 81.The employing sill or the silver-based material of said D rectangle contact 816, as: siller tin oxide.Opening between C rectangle contact 815 and the D rectangle contact 816 apart from being 1mm～10mm.In the present invention, opening between C rectangle contact 815 and the D rectangle contact 816 apart from being called the second contact gap 817 (shown in Fig. 5 B).
In the present invention, A rectangle contact 805, B rectangle contact 806, C rectangle contact 815 and D rectangle contact 816 can be processed into cylindrical, and for the installation of the fan-shaped contact of realizing cylindrical contact and both sides, then an end of fan-shaped contact is designed to circular shape.
In the present invention, the fan-shaped contact 804 of B rectangle contact 806, the fan-shaped contact 803 of C and D forms the first moving contact group; The fan-shaped contact 814 of D rectangle contact 816, the fan-shaped contact 813 of G and H forms the second moving contact group; The said first moving contact group is identical with the motion of the said second moving contact group under the magnetic force condition that produces behind the coil loading current.
In the present invention, the fan-shaped contact 802 of A rectangle contact 805, the fan-shaped contact 801 of A and B forms the first fixed contact group; The fan-shaped contact 812 of C rectangle contact 815, the fan-shaped contact 811 of E and F forms the second fixed contact group; The said first fixed contact group is identical with the motion of the said second fixed contact group under the magnetic force condition that produces behind the coil loading current.
In the present invention, the first moving contact group and the first fixed contact group, the second moving contact group and the second fixed contact group A constitute double break point contact, form the electric arc of two groups of series connection.
(4) the magnetic blow-out assembly 9
Referring to Figure 1B, shown in Figure 4, said magnetic blow-out assembly 9 includes first permanent magnet 91, second permanent magnet 92 and dividing plate 93.
The bottom of said dividing plate 93 is provided with blind hole 931, and said blind hole 931 is used to place the other end of touch spring support 6, and the other end of touch spring support 6 is stretched in said blind hole 931; The A plate face 932 of said dividing plate 93 is provided with the 3rd conduit 934, and said the 3rd conduit 934 is used to install the second arc grid sheet 7D; The B plate face 933 of said dividing plate 93 is provided with the 4th conduit 935, and said the 4th conduit 935 is used to install the first arc grid sheet 7C; Said dividing plate 93 is provided with the A rectangular opening 936 that supplies first permanent magnet 91 to pass and passes B rectangular opening 937 with confession second permanent magnet 92; Between said A rectangular opening 936 and the said B rectangular opening 937 is conduit.Said first permanent magnet 91, second permanent magnet 92 all adopt permanent-magnet alloy or ferrite, as: neodymium iron boron.
The annexation of the nonpolarity hydrogen gas mixture direct current arc quenching system of the present invention's design is: grid chip module 7, contact assembly 8 and magnetic blow-out assembly 9 place in the housing; Load A electrode 3A, load B electrode 3B are connected with contact assembly 8 respectively; Grid chip module 7 is distributed in the both sides of magnetic blow-out assembly 9; Inflating catheter 4 is arranged on the seal cover 2, in arcing chamber 4A, charges into hydrogen (purity 99.9%) or hydrogen and nitrogen mixture body through said inflating catheter 4; The volume ratio of nitrogen and hydrogen is 1: 2～9 in said hydrogen and the nitrogen mixture body.
Said inflating catheter 4 can import in the housing through the mist of flexible pipe with hydrogen (purity 99.9%), hydrogen and the nitrogen of outside, and the hydrogen of importing or mist fill up whole arcing chamber 4A.
Referring to shown in Figure 5; Static volt ampere according to direct-current arc; Through being carried in the supply voltage U on load A electrode 3A and the load B electrode 3B, and the resistance R and the inductance L of carrying on load A electrode 3A and load B electrode 3B and the contact assembly 8, obtaining direct-current arc balance of voltage relation and do
I representes arc current, u
aThe arc voltage of representing the first contact gap or the second contact gap,
The expression arc current is rate over time.
As the arc voltage u of supply voltage U more than or equal to the first contact gap and the second contact gap
aThe time (U>=u
a), electric arc will burn, otherwise electric arc will extinguish.Thereby can obtain the condition of extinguishing of direct-current arc, take measures to strengthen arc voltage, i.e. u
a＞U-R * I.
In the present invention, in order to improve the static volt ampere of direct-current arc, concern u according to arc voltage
a=n * u
0+ E * s, n represent that electric arc is by the hop count of grid sheet cutting, u
0Expression electric arc is by every section arc voltage of grid sheet cutting, and s representes arc length, and E representes the electric field strength of electric arc, this shows, the measure that can take has: increase the proximal pole pressure drop, increase arc length, increase electric arc electric field strength.
Electric arc is kept by heat is free, reduces arc temperature and just can weaken heat and dissociate, reduce new charging point generation.Simultaneously, also reduce the movement velocity of charging point, strengthened composite action.The present invention is through fan-shaped contact pilot arc, and magnetic field quickens electric arc to the motion of grid sheet group, and electric arc is elongated and cut into n short arc, and the reduction Arc Temperature has increased pressure drop simultaneously, has improved arc voltage.
The characteristic of place medium has determined to go in the electric arc intensity of dissociating to a great extent during arc burning, and these characteristics comprise: conductive coefficient, thermal capacity, the free temperature of heat, dielectric strength etc.If these parameter values are big, then go free process just strong more, electric arc just extinguishes more easily.The hydrogen gas mixture that fills 1～5 atmospheric pressure hydrogen or different volumes ratio among the present invention in the arc quenching system (comprises nitrogen, hydrogen; The volume ratio of nitrogen and hydrogen is 1: 2～9); The light weight of hydrogen, molecular motion speed is fast, conductive coefficient is high and characteristics such as medium recovery strength height; Make hydrogen compare other switches as the aviation switch of switch arc-extinguishing medium and have advantage clearly, hydrogen goes liberation strong, is beneficial to extinguish direct-current arc.
The pressure of gas medium is very big to the influence that electric arc goes to dissociate.Because the pressure of gas is big more, the concentration of particle is just big more in the electric arc, and the distance between particle is just more little, and composite action is strong more, and electric arc just extinguishes more easily.
Contact material also influences the process of dissociating.When contact adopts the refractory metal that fusing point is high, the capacity of heat transmission is strong and thermal capacity is big, reduced the metallic vapour in thermionic emission and the electric arc, help arc extinction.Arc voltage is made up of cathode drop, voltage drop in arc column and anode drop, and cathode drop is mainly by contact material decision, below is the arc voltage pressure drop mean value of contact cathode material commonly used:
<tables num="0001"> <table > <tgroup cols="2"> <colspec colname = "c001" colwidth = "35 % " /> <colspec colname="c002" colwidth="64%" /> <tbody > <row > <entry morerows =" 1 "> Copper </entry> <entry morerows="1"> 21.5V </entry> </row> <row > <entry morerows = "1"> Silver </entry> <entry morerows="1"> 17V </entry> </row> <row > <entry morerows =" 1 "> cadmium </entry> <entry morerows="1"> 10V </entry> </row> <row > <entry morerows = "1"> tin </entry> <entry morerows="1"> 11.3V </entry> </row> <row > <entry morerows="1"> Tungsten </entry> <entry morerows="1"> 26V </entry> </row> <row > <entry morerows="1"> copper tungsten </entry> <entry morerows="1"> 21.5 ~ 26V </entry> </row> < / tbody> </tgroup> </table> </tables>
The height of arc voltage depends on that cathode material produces the complexity of steam, and the boiling point of cathode material is low more, under lower temperature, just can produce enough metallic vapours; The conductive coefficient of cathode material is low more, and heat is difficult for leading away more, and the temperature of cathode surface also raises more easily, so both products are just more little, thereby imports the metallic vapour that less energy just can produce bigger enough pilot arcs, makes arc voltage lower.Otherwise be difficult to produce the material of metallic vapour, then arc voltage is higher.
Arc voltage pressure drop by the visible tungsten material of above table is maximum, but the cost of tungsten material is high, so fan-shaped contact is selected copper tungsten material for use among the present invention, copper tungsten material has good advantages such as anti-arc erosion property, resistance fusion welding and high strength.
The externally-applied magnetic field permanent magnet improves arc motion speed; Elongate electric arc and increase arc stream; And additional back electromotive force; Improve the dynamic voltage-current characteristic of electric arcs through these measures of organic synthesis, the arc extinguishing ability when guaranteeing different electric current is unlikely to the arc extinguishing hyperenergia again and produces cut-off overvoltage when big electric current.
Shown in Fig. 5 A, Fig. 5 B, a kind of nonpolarity direct current arc quenching system that is applicable to D.C. contactor of the present invention's design, the arc motion process after the loading power voltage U is following:
When load A electrode 3A connects cathode power supply voltage, load B electrode 3B connects negative power supply voltage (shown in Fig. 5 A);
Two serial arcs that the first contact gap 807, the second contact gap 817 form (i.e. first electric arc 808, second electric arc 818); Said electric arc receives under the effect in the magnetic field that produces between permanent magnet 91A and the permanent magnet 92B; According to left hand rule; The Lorentz force F4 effect that first electric arc 808 in the first contact gap 807 is produced, first electric arc 808 will be in the direction motion perpendicular to arc current and magnetic field; The Lorentz force FD effect that second electric arc 818 in the second contact gap 817 is produced, second electric arc 818 will be in the direction motion perpendicular to arc current and magnetic field.
First electric arc 808 is under the guiding of fan-shaped contact 801 of A and the fan-shaped contact 803 of C; First electric arc 808 moves along the cambered surface smooth trajectory of fan-shaped contact, and the Lorentz force F4 that magnetic field produces first electric arc 808 between the permanent magnet simultaneously can blow first electric arc 808 and quicken to get into the first ring-shaped gate sheet group 7A; The said first ring-shaped gate sheet group 7A cuts into a plurality of short arcs with first electric arc 808.
Second electric arc 818 is under the guiding of fan-shaped contact 812 of F and the fan-shaped contact 814 of H; Second electric arc 818 moves along the cambered surface smooth trajectory of fan-shaped contact, and the Lorentz force FD that magnetic field produces second electric arc 818 between the permanent magnet simultaneously can blow second electric arc 818 and quicken to get into the second ring-shaped gate sheet group 7B; The said second ring-shaped gate sheet group 7B cuts into a plurality of short arcs with second electric arc 818.
When load A electrode 3A connects negative power supply voltage, load B electrode 3B connects cathode power supply voltage (shown in Fig. 5 B);
Two serial arcs that the first contact gap 807, the second contact gap 817 form (i.e. first electric arc 808, second electric arc 818); Said electric arc receives under the effect in the magnetic field that produces between permanent magnet 91A and the permanent magnet 92B; According to left hand rule; The Lorentz force FB effect that first electric arc 808 in the first contact gap 807 is produced, first electric arc 808 will be in the direction motion perpendicular to arc current and magnetic field; The Lorentz force FC effect that second electric arc 818 in the second contact gap 817 is produced, second electric arc 818 will be in the direction motion perpendicular to arc current and magnetic field.
First electric arc 808 is under the guiding of fan-shaped contact 802 of B and the fan-shaped contact 804 of D; First electric arc 808 moves along the cambered surface smooth trajectory of fan-shaped contact, and the Lorentz force FB that magnetic field produces first electric arc 808 between the permanent magnet simultaneously can blow first electric arc 808 and quicken to get into the 3rd ring-shaped gate sheet group 7C; Said the 3rd ring-shaped gate sheet group 7C cuts into a plurality of short arcs with first electric arc 808.
Second electric arc 818 is under the guiding of fan-shaped contact 811 of E and the fan-shaped contact 813 of G; Second electric arc 818 moves along the cambered surface smooth trajectory of fan-shaped contact, and the Lorentz force FC that magnetic field produces second electric arc 818 between the permanent magnet simultaneously can blow second electric arc 818 and quicken to get into the 4th ring-shaped gate sheet group 7D; Said the 4th ring-shaped gate sheet group 7D cuts into a plurality of short arcs with second electric arc 818.
In the present invention, the arc drop of two series connection that double break point contact produces is the twice of single-break contact, and every section electric arc all has pressure drop, and the grid sheet can cool off electric arc with raising arc potential gradient simultaneously, thereby helps extinguish arcs.
The nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor of the present invention's design; This system has realized nonpolarity hydrogen gas mixture direct current arc extinguishing; Through reasonable Arrangement permanent magnet and grid chip architecture, utilize ring-shaped gate sheet monomer and arc grid sheet monomer concyclic, reach electric arc and contact rapidly with the grid sheet; And contact area is maximum, thus rapid arc extinguishing; Adopt monosymmetric striking contact simultaneously, pilot arc is introduced electric arc in the grid sheet group of the left and right sides along striking contact orbiting motion in the arc control device that are filled with hydrogen or hydrogen gas mixture, and electric arc is cut into the multistage short arc in the grid sheet, and cooling is extinguished; Permanent magnet has increased magnetic field intensity, plays the effect of magnetic blow-out, quickens arc motion speed, has improved arc quenching effect.
Claims (10)
1. nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor, it is characterized in that: this direct current arc quenching system includes load A electrode (3A), load B electrode (3B), inflating catheter (4), housing, grid chip module (7), contact assembly (8), magnetic blow-out assembly (9);
Said housing includes seal cover (2), dead ring (1) and insulation board (5); Be arranged with first conduit (11), second conduit on the inwall of said dead ring (1), first conduit (11) is used to install the first ring-shaped gate sheet group (7A), and second conduit is used to install the second ring-shaped gate sheet group (7B); Said seal cover (2) is provided with first through hole (2A) that is used for load A electrode (3A) and passes, be used for second through hole (2B) that load B electrode (3B) passes, be used for the third through-hole (2C) that inflating catheter (4) passes; The center of said insulation board (5) is provided with fourth hole (51), and said fourth hole (51) is used for touch spring support (6) one ends and passes; The other end of touch spring support (6) places the blind hole (931) of the dividing plate (93) of magnetic blow-out assembly (9); The bottom fitting insulating panels (5) of dead ring (1), seal cover (2) is installed at the top of dead ring (1); Be placed with grid chip module (7), contact assembly (8), magnetic blow-out assembly (9) in the dead ring (1); After in dead ring (1), placing grid chip module (7), contact assembly (8), magnetic blow-out assembly (9), remaining space is arcing chamber (4A);
Said grid chip module (7) includes the first ring-shaped gate sheet group (7A), the second ring-shaped gate sheet group (7B), the first arc grid sheet group (7C) and the second arc grid sheet group (7D); The first ring-shaped gate sheet group (7A) is identical with second ring-shaped gate sheet group (7B) structure; The first arc grid sheet group (7C) is identical with second arc grid sheet group (7D) structure;
The first arc grid sheet group (7C) is placed with the second arc grid sheet group (7D) relatively, and is installed in dividing plate (93) both sides of magnetic blow-out assembly (9); The first ring-shaped gate sheet group (7A) is placed with the second ring-shaped gate sheet group (7B) relatively, and is installed in first conduit (11), second conduit of dead ring (1) inwall; The arc limit of the first ring-shaped gate sheet group (7A) and the first arc grid sheet group (7C) is relative, and to be configured as with the contact center point be the conformal circle of first grid sheet (7E) in the center of circle; The arc limit of the second ring-shaped gate sheet group (7B) and the second arc grid sheet group (7D) is relative, and to be configured as with the contact center point be the conformal circle of the second grid sheet (7F) in the center of circle;
Said contact assembly (8) includes contact supporting (81), the fan-shaped contact of A (801), the fan-shaped contact of B (802), the fan-shaped contact of C (803), the fan-shaped contact of D (804), A rectangle contact (805), B rectangle contact (806), the fan-shaped contact of E (811), the fan-shaped contact of F (812), the fan-shaped contact of G (813), the fan-shaped contact of H (814), C rectangle contact (815), D rectangle contact (816);
Said contact supporting (81) is the U-shaped structure; The two ends of contact supporting (81) are provided with A support arm (83) and B support arm (84); Be transverse slat (85) between A support arm (83) and the B support arm (84), transverse slat (85) is provided with fifth hole (82), and fifth hole (82) is used for touch spring support (6) and passes; A support arm (83) is used for installing and supporting B rectangle contact (806), and B support arm (84) is used for installing and supporting D rectangle contact (816);
The both sides of said A rectangle contact (805) are equipped with fan-shaped contact of A (801) and the fan-shaped contact of B (802); A rectangle contact (805) is connected with an end of load A electrode (3A); The both sides of said B rectangle contact (806) are equipped with fan-shaped contact of C (803) and the fan-shaped contact of D (804); B rectangle contact (806) is installed on the A support arm (83) of contact supporting (81); The first contact gap (807) between A rectangle contact (805) and the B rectangle contact (806) is 1mm～10mm;
The both sides of said C rectangle contact (815) are equipped with fan-shaped contact of E (811) and the fan-shaped contact of F (812); C rectangle contact (815) is connected with an end of load B electrode (3B); The both sides of said D rectangle contact (816) are equipped with fan-shaped contact of G (813) and the fan-shaped contact of H (814); D rectangle contact (816) is installed on the B support arm (84) of contact supporting (81); The second contact gap (817) between C rectangle contact (815) and the D rectangle contact (816) is 1mm～10mm;
Said magnetic blow-out assembly (9) includes first permanent magnet (91), second permanent magnet (92) and dividing plate (93); The bottom of said dividing plate (93) is provided with blind hole (931), and said blind hole (931) is used to place the other end of touch spring support (6), and the other end of touch spring support (6) is stretched in said blind hole (931); The A plate face (932) of said dividing plate (93) is provided with the 3rd conduit (934), and said the 3rd conduit (934) is used to install the second arc grid sheet (7D); The B plate face (933) of said dividing plate (93) is provided with the 4th conduit (935), and said the 4th conduit (935) is used to install the first arc grid sheet (7C); Said dividing plate (93) is provided with the A rectangular opening (936) and confession second permanent magnet (92) that supply first permanent magnet (91) to pass and passes B rectangular opening (937); Between said A rectangular opening (936) and the said B rectangular opening (937) is conduit.
2. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1, it is characterized in that: the rapidoprint of dead ring (1) can adopt nylon, PVC, melamine; The rapidoprint of insulation board (5) can adopt nylon, PVC, melamine.
3. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1, it is characterized in that: the rapidoprint of seal cover (2) can adopt glass, pottery.
4. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: said ring-shaped gate sheet group and arc grid sheet group by a plurality of grid sheet monomers according to grid sheet arrangement pitches h longitudinally center line rearrange; Said grid sheet arrangement pitches h is equidistant, h=0.4mm～2.0mm; Grid sheet monomer adopts copper tungsten material.
5. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: required grid sheet monoblock is counted M and is satisfied relation according to supply voltage U and electric arc by the hop count n (and n=M+1) of grid sheet cutting in the grid chip module (7)
u
aRepresent the arc voltage in the first contact gap or the second contact gap, E representes the electric field strength of electric arc, and s representes arc length, u
0Expression electric arc is by every section arc voltage of grid sheet cutting.
6. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: B rectangle contact (806), the fan-shaped contact of C (803) and the fan-shaped contact of D (804) form the first moving contact group; D rectangle contact (816), the fan-shaped contact of G (813) and the fan-shaped contact of H (814) form the second moving contact group; The said first moving contact group is identical with the motion of the said second moving contact group under the magnetic force condition that produces behind the coil loading current.
7. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: A rectangle contact (805), the fan-shaped contact of A (801) and the fan-shaped contact of B (802) form the first fixed contact group; C rectangle contact (815), the fan-shaped contact of E (811) and the fan-shaped contact of F (812) form the second fixed contact group; The said first fixed contact group is identical with the motion of the said second fixed contact group under the magnetic force condition that produces behind the coil loading current.
8. according to claim 1,6, the 7 described nonpolarity hydrogen gas mixture direct current arc quenching systems that are used for D.C. contactor; It is characterized in that: the first moving contact group and the first fixed contact group, the second moving contact group and the second fixed contact group A constitute double break point contact, form the electric arc of two groups of series connection.
9. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: said first permanent magnet (91), second permanent magnet (92) adopt permanent-magnet alloy or ferrite.
10. the nonpolarity hydrogen gas mixture direct current arc quenching system that is used for D.C. contactor according to claim 1 is characterized in that: in arcing chamber (4A), charge into hydrogen or hydrogen and nitrogen mixture body through inflating catheter (4); The volume ratio of nitrogen and hydrogen is 1: 2～9 in said hydrogen and the nitrogen mixture body.
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| CN201210038922.2A CN102592890B (en) | 2012-02-20 | 2012-02-20 | Non-polar hydrogen mixed gas DC (direct-current) arc extinction system for DC contactor |
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| CN201210038922.2A CN102592890B (en) | 2012-02-20 | 2012-02-20 | Non-polar hydrogen mixed gas DC (direct-current) arc extinction system for DC contactor |
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| CN104795277A (en) * | 2014-01-21 | 2015-07-22 | 昆山国力真空电器有限公司 | DC contactor |
| CN104966646A (en) * | 2015-07-03 | 2015-10-07 | 昆山国力真空电器有限公司 | Non-polar DC contactor |
| CN106486323A (en) * | 2015-08-31 | 2017-03-08 | 比亚迪股份有限公司 | Relay |
| CN106653487A (en) * | 2017-01-21 | 2017-05-10 | 上海旭光真空科技有限公司 | Production method of high-voltage DC contactor |
| CN106710969A (en) * | 2017-02-09 | 2017-05-24 | 苏州安来强电子科技有限公司 | Sealing type contactor with arcing angle |
| CN109256300A (en) * | 2018-11-14 | 2019-01-22 | 沈阳二三控制电器制造有限公司 | A kind of nonpolarity ceramic seal bipolar DC contactor |
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| CN104795277A (en) * | 2014-01-21 | 2015-07-22 | 昆山国力真空电器有限公司 | DC contactor |
| CN104966646A (en) * | 2015-07-03 | 2015-10-07 | 昆山国力真空电器有限公司 | Non-polar DC contactor |
| CN106486323A (en) * | 2015-08-31 | 2017-03-08 | 比亚迪股份有限公司 | Relay |
| CN106486323B (en) * | 2015-08-31 | 2019-01-11 | 比亚迪股份有限公司 | relay |
| CN106653487B (en) * | 2017-01-21 | 2019-05-14 | 旭格威科技（上海）有限公司 | A kind of production method of high-voltage DC contactor |
| CN106653487A (en) * | 2017-01-21 | 2017-05-10 | 上海旭光真空科技有限公司 | Production method of high-voltage DC contactor |
| CN106710969A (en) * | 2017-02-09 | 2017-05-24 | 苏州安来强电子科技有限公司 | Sealing type contactor with arcing angle |
| CN109256300A (en) * | 2018-11-14 | 2019-01-22 | 沈阳二三控制电器制造有限公司 | A kind of nonpolarity ceramic seal bipolar DC contactor |
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| CN110911192A (en) * | 2019-12-18 | 2020-03-24 | 柏仕海 | Electric power grading arc extinguishing device based on Bernoulli principle |
| CN111146028A (en) * | 2020-01-15 | 2020-05-12 | 上海电器科学研究所（集团）有限公司 | Direct current contactor contact arc extinguishing system |
| CN111403231A (en) * | 2020-03-13 | 2020-07-10 | 云南电网有限责任公司电力科学研究院 | Hybrid arc extinguishing chamber |
| CN114613628A (en) * | 2022-03-18 | 2022-06-10 | 深圳市友利通新能源科技有限公司 | Direct current contactor |
| CN114613628B (en) * | 2022-03-18 | 2023-11-24 | 深圳市友利通新能源科技有限公司 | DC contactor |
| CN116884803A (en) * | 2023-06-20 | 2023-10-13 | 四川大学 | Vacuum arc extinguishing chamber |
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