CN111785572A - Nonpolarity high voltage direct current contactor arc extinguishing system - Google Patents
Nonpolarity high voltage direct current contactor arc extinguishing system Download PDFInfo
- Publication number
- CN111785572A CN111785572A CN202010743871.8A CN202010743871A CN111785572A CN 111785572 A CN111785572 A CN 111785572A CN 202010743871 A CN202010743871 A CN 202010743871A CN 111785572 A CN111785572 A CN 111785572A
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- CN
- China
- Prior art keywords
- arc
- arc extinguishing
- metal grid
- extinguishing
- cover
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
- H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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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
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
- H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets
Abstract
The invention discloses an arc extinguishing system of a non-polar high-voltage direct-current contactor, belonging to the technical field of electric appliances and comprising: a cover seat and a permanent magnet; an arc extinguishing cover and an arc extinguishing metal grid sheet; a stationary contact; a movable contact and a telescopic mechanism; the end face of the permanent magnet is aligned and superposed with the central lines of the movable contact and the fixed contact, so that the magnetic field between the movable contact and the fixed contact is enhanced, the electric arc generated between the movable contact and the fixed contact can move in the front-back direction no matter the same end of the fixed contact is connected with a positive electrode or a negative electrode at the position of the movable contact and the fixed contact at the initial position, the left-hand rule can judge that the electric arc moves in the front-back direction, the moving direction of the electric arc is changed due to the change of the moving direction of the electric arc and the change of the electromagnetic force direction between the contacts of the movable contact and the fixed contact under the combined action of the magnetic field of the permanent magnet, so that the moving direction of the electric arc is changed, the electric arc is elongated, the blown electric arc is attracted and elongated to a transverse electric arc.
Description
Technical Field
The invention relates to an arc extinguishing system of a non-polar high-voltage direct-current contactor, and belongs to the technical field of electric appliances.
Background
At present, with the continuous development of scientific technology, in industries such as fuel cell solar systems, new energy related infrastructures, high-power direct current equipment and the like, direct current power supply systems above 1000VDC tend to be adopted to provide higher power, product requirements also tend to adopt nonpolarity, and the high-voltage direct current contactor is convenient to install and safe;
the existing direct current contactor with the best performance matched with the existing direct current contactor is a ceramic packaging (loose structure) or an epoxy packaging (Thailand structure) sealed contactor, although most manufacturers can realize switching under a high-power load, the bearing times of on-load switching of the direct current contactor are generally low, particularly under the load condition of more than 200A1000VDC, the dynamic and static contacts can only meet the working life of dozens of times or even hundreds of times generally, and the main problem is that: direct current does not have zero crossing points like alternating current, and the electric arc cannot be naturally extinguished.
Disclosure of Invention
In order to solve the technical problem, the invention provides an arc extinguishing system of a non-polar high-voltage direct-current contactor.
The invention is realized by the following technical scheme.
The invention provides an arc extinguishing system of a non-polar high-voltage direct-current contactor, which comprises: the four permanent magnets are respectively and fixedly arranged in the four corners of the arc extinguishing cover at intervals; n-level of the four permanent magnets faces inwards, and S-level faces outwards;
the arc extinguishing shield comprises an arc extinguishing shield and arc extinguishing metal grid pieces, wherein arc elongated slots are formed in the middle of the arc extinguishing metal grid pieces, a plurality of arc extinguishing metal grid pieces are overlapped to form two groups, and the two groups of arc extinguishing metal grid pieces are fixed on the inner wall of an inner cavity of the arc extinguishing shield at intervals; the bottom surface of the arc-extinguishing cover is fixed with the upper surface of the cover seat, and the permanent magnet is positioned in the arc-extinguishing cover; the arc-extinguishing metal grid sheet is a magnet;
the two static contacts are fixed on the upper surface of the cover seat in the arc elongated slot in the middle of the two groups of arc extinguishing metal grid pieces at intervals;
the movable contact is positioned above the fixed contact and moves up and down along with the telescopic mechanism, so that the movable contact and the fixed contact are switched on and off.
The end face of the permanent magnet is aligned and superposed with the central lines of the movable contact and the fixed contact.
The arc extinction metal grid plate is made of soft magnetic materials.
And after the bottom surface of the arc-extinguishing cover is fixed with the upper surface of the cover seat, the permanent magnet is positioned in the blind hole in the side wall of the arc-extinguishing cover.
The single group of the arc-extinguishing metal grid plates is at least more than ten and two groups of twenty-ten.
The arc extinguishing cover is an internal cavity which is concave from the bottom surface, a groove for installing an arc extinguishing metal grid piece is arranged on the inner wall of the internal cavity, and the arc extinguishing metal grid piece is in interference fit or bonded in the groove to realize fixed installation.
Four mounting grooves for mounting four permanent magnets are arranged at four corners of the upper surface of the cover seat, and the permanent magnets are in interference fit or bonded in the mounting grooves to realize fixed mounting.
And the groove width of the arc-extinguishing elongated groove on the arc-extinguishing metal grid piece is gradually reduced.
The bottom surfaces of the arc extinction metal grid plates incline upwards towards two sides, so that an included angle alpha is formed between the bottom surfaces of the arc extinction metal grid plates and the upper surface plane of the cover seat, and the alpha is 5 degrees.
The invention has the beneficial effects that: the end face of the permanent magnet is aligned and superposed with the central lines of the movable contact and the fixed contact, so that magnetic fields generated on the contact surfaces of the movable contact and the fixed contact can be superposed, the magnetic field between the movable contact and the fixed contact is enhanced, the electric arc generated between the movable contact and the fixed contact can move forwards and backwards no matter the same end of the fixed contact is connected with a positive electrode or a negative electrode at the position of the electric arc at the initial position, the left-hand rule can judge that the electric arc moves forwards and backwards, due to the change of the moving direction of the electric arc and the combined action of the magnetic fields of the permanent magnet, the direction of the electromagnetic force between the contacts of the movable contact and the fixed contact is changed, so that the moving direction of the electric arc is changed, and meanwhile, due to the gradual reduction of the groove width of an electric arc elongated groove on the arc extinction metal grid, the electric arc is elongated, meanwhile, the bottom surfaces of the arc extinction, The arc is lengthened into the transverse arc elongated slot, the motion track of the arc is increased, the arc is rapidly broken and extinguished, and therefore the adverse effects of loss, adhesion and the like of the moving contact and the fixed contact caused by continuous high-temperature combustion of the arc are effectively reduced, the use safety of the moving contact and the fixed contact of the contactor is improved, and the service life of the contactor is prolonged.
Drawings
FIG. 1 is a schematic view of a main perspective structure of the present invention with a moving contact connected to a negative electrode and a stationary contact connected to a positive electrode;
FIG. 2 is a schematic view of the main perspective structure of the moving contact connected to the positive electrode and the stationary contact connected to the negative electrode of the present invention;
figure 3 is a schematic view of the internal structure of the present invention without the arc chute mounted therein;
FIG. 4 is a schematic view of the internal structure of the present invention from the front;
fig. 5 is a schematic top view of an arc-extinguishing metal grid of the present invention;
FIG. 6 is a schematic illustration of the permanent magnet, stationary contact magnetic field of the present invention;
FIG. 7 is a schematic diagram of the magnetic fields of the permanent magnet and the moving contact of the present invention;
in the figure: 1-a cover seat; 2-a permanent magnet; 3-arc extinguishing chamber; 4-arc suppression metal grid sheet; 41-arc elongated slot; 5-a stationary contact; 6-moving contact; 7-telescoping mechanism.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
See fig. 1-7.
The invention relates to an arc extinguishing system of a non-polar high-voltage direct-current contactor, which comprises: the permanent magnet 2, the arc extinguishing chamber 3, four permanent magnets 2 are fixedly installed in four corners of the arc extinguishing chamber 3 at intervals respectively; the N-level and the S-level of the four permanent magnets 2 face inwards and outwards;
the arc extinguishing shield comprises a shield seat 1 and arc extinguishing metal grid pieces 4, wherein arc elongated slots 41 are formed in the middle of the arc extinguishing metal grid pieces 4, the arc extinguishing metal grid pieces 4 are overlapped to form two groups, and the two groups of arc extinguishing metal grid pieces 4 are oppositely fixed on the inner wall of an inner cavity of the arc extinguishing shield 3, which is concave from the bottom surface, at left and right intervals; the bottom surface of the arc-extinguishing shield 3 is welded, bonded or riveted with the upper surface of the shield base 1, and the permanent magnet 2 is positioned in the shield base 1; the arc-extinguishing metal grid 4 is a magnet;
the two static contacts 5 are fixed on the upper surface of the cover seat 1 in the arc elongated slot 41 in the middle of the two groups of arc extinguishing metal grid pieces 4 at intervals;
the movable contact 6 and the fixed contact 5 are connected and disconnected by the movable contact 6 and the telescopic mechanism 7, one end of the telescopic mechanism 7 is fixedly connected with the top surface of the cover seat 1, the other end of the telescopic mechanism 7 is respectively fixed with the two movable contacts 6, and the movable contact 6 is correspondingly positioned above the fixed contact 5 and moves up and down along with the telescopic mechanism 7.
The end faces of the permanent magnets 2 are aligned and superposed with the central lines of the movable contact 6 and the fixed contact 5, and referring to fig. 3, the opposite end faces of the two permanent magnets 2 are aligned and superposed with the central lines of the movable contact 6 and the fixed contact 5.
The telescopic mechanism 7 can be a transmission core bar component commonly used for relays, and a high-pressure sealing direct current contactor with an auxiliary contact disclosed in the Chinese patent application number 2016203004456 is described and is not detailed in the prior art; the telescopic mechanism 7 can also adopt one of a telescopic electric rod or a telescopic air cylinder.
The arc extinction metal grid plate 4 is made of soft magnetic materials.
The lateral wall of arc-extinguishing chamber 3 is equipped with stifled hole from the bottom upwards, and after 3 bottom surfaces of arc-extinguishing chamber and cover seat 1 upper surface were fixed, permanent magnet 2 was located 3 lateral walls of arc-extinguishing chamber in stifled hole.
The single group of the arc-extinguishing metal grid plates 4 is at least more than ten and two groups of twenty-ten.
The arc extinguishing cover 3 is an internal cavity which is concave from the bottom surface, a groove for installing the arc extinguishing metal grid sheet 4 is arranged on the inner wall of the internal cavity, and the arc extinguishing metal grid sheet 4 is in interference fit or bonded in the groove to realize fixed installation.
Four mounting grooves for mounting four permanent magnets 2 are arranged at four corners of the upper surface of the cover seat 1, and the permanent magnets 2 are in interference fit or bonded in the mounting grooves to realize fixed mounting.
The arc-extinguishing metal grid 4 has an arc-elongated slot 41 with a gradually decreasing slot width, as shown in fig. 4, from the right end to the left end, the arc-elongated slot 41 has a gradually decreasing slot width.
The bottom surfaces of the arc extinction metal grid pieces 4 incline upwards towards two sides, so that an included angle alpha is formed between the bottom surfaces of the arc extinction metal grid pieces 4 and the upper surface plane of the cover seat 1, and the alpha is 5 degrees.
The working principle is as follows: when the telescopic mechanism 7 extends downwards to make the movable contact 6 contact with the fixed contact 5, the conducting wires connected to the movable contact 6 and the fixed contact 5 are electrified, when the telescopic mechanism 7 contracts upwards to separate the movable contact 6 from the fixed contact 5, electric arcs are generated between the movable contact 6 and the fixed contact 5, the polarities of every two paired permanent magnets 2 are N-level to N-level, the magnetic field intensity of the permanent magnets 2 is larger than S-level to S-level, the end surface of the permanent magnets 2 is aligned and superposed with the central lines of the movable contact 6 and the fixed contact 5, so that magnetic fields generated on the contact surfaces of the movable contact 6 and the fixed contact 5 are superposed, a magnetic field direction horizontal magnetic field is enhanced for the fixed contact 5 on the left side, a horizontal magnetic field is enhanced for the fixed contact 5 on the right side, and a horizontal magnetic field is enhanced for the fixed contact 5 on the right side similarly, referring to figures 5 and 6, and 5, the electric arcs generated between the movable contact 6 and the fixed contact 5 can move forwards and according to the left-hand rule, it can be determined that the moving direction of the electric arc is changed and the direction of the electromagnetic force between the contacts of the movable contact 6 and the fixed contact 5 is changed under the combined action of the magnetic field of the permanent magnet 2, so that the moving direction of the electric arc is also changed, the moving track of the electric arc between the movable contact 6 and the fixed contact 5 moves towards the arc elongated slot 41 at the side of the arc extinguishing metal grid piece 4, and referring to the attached drawings 1 and 2, the short circuit caused by the electric arc contact generated between the movable contact 6 and the fixed contact 5 is effectively prevented, and the nonpolar arc extinguishing is realized.
Meanwhile, the arc extinguishing system also comprises a plurality of arc extinguishing metal grid pieces 3, the arc extinguishing metal grid pieces 3 are arranged in the arc extinguishing cover 1, the width of an arc elongated slot 41 on each arc extinguishing metal grid piece 4 is gradually reduced, so that the arc is elongated, the bottom surface of each arc extinguishing metal grid piece 4 is inclined upwards by 5 degrees towards two sides, blown arcs are attracted by the arc extinguishing metal grid pieces 4 and are elongated into the transverse arc elongated slot 41, the movement track of the arcs is increased, the arcs are quickly broken and extinguished, therefore, the adverse effects of loss, adhesion and the like of continuous high-temperature combustion of the arcs on the movable contact 6 and the static contact 5 are effectively reduced, the use safety and the service life of the movable contact 6 and the static contact 5 of the contactor are improved.
Claims (9)
1. The utility model provides a nonpolarity high voltage direct current contactor arc extinguishing system which characterized in that includes: the four permanent magnets (2) are respectively and fixedly arranged in four corners of the arc extinguishing cover (3) at intervals; n-level of the four permanent magnets (2) faces inwards, and S-level faces outwards;
the arc extinguishing shield comprises a shield seat (1) and arc extinguishing metal grid pieces (4), wherein arc elongated grooves (41) are formed in the middle of the arc extinguishing metal grid pieces (4), a plurality of arc extinguishing metal grid pieces (4) are overlapped to form two groups, and the two groups of arc extinguishing metal grid pieces (4) are fixed on the inner wall of a cavity in the arc extinguishing shield (3) at intervals; the bottom surface of the arc-extinguishing cover (3) is fixed with the upper surface of the cover seat (1), and the permanent magnet (2) is positioned in the arc-extinguishing cover (3); the arc-extinguishing metal grid sheet (4) is a magnet;
the two stationary contacts (5) are fixed on the upper surface of the cover seat (1) in the arc elongated slot (41) in the middle of the two groups of arc extinguishing metal grid pieces (4) at intervals;
the movable contact structure comprises movable contacts (6) and a telescopic mechanism (7), wherein one end of the telescopic mechanism (7) is fixedly connected with the top surface of the cover seat (1), the other end of the telescopic mechanism (7) is respectively used for fixing two movable contacts (6), the movable contacts (6) are positioned above the fixed contacts (5) and move up and down along with the telescopic mechanism (7), and the movable contacts (6) are connected with and disconnected from the fixed contacts (5).
2. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the end face of the permanent magnet (2) is aligned and superposed with the center lines of the movable contact (6) and the fixed contact (5).
3. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the arc extinction metal grid plate (4) is made of soft magnetic materials.
4. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the side wall of the arc-extinguishing cover (3) is plugged, the bottom surface of the arc-extinguishing cover (3) is fixed with the upper surface of the cover seat (1), and the permanent magnet (2) is located in the side wall of the arc-extinguishing cover (3).
5. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the single group of the arc-extinguishing metal grid plates (4) is at least more than ten and two groups of twenty-ten.
6. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the arc extinguishing cover (3) is an internal cavity which is concave from the bottom surface, a groove for installing the arc extinguishing metal grid sheet (4) is arranged on the inner wall of the internal cavity, and the arc extinguishing metal grid sheet (4) is in interference fit or is adhered in the groove.
7. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: four mounting grooves for mounting four permanent magnets (2) are arranged at four corners of the upper surface of the cover seat (1), and the permanent magnets (2) are in interference fit or bonded in the mounting grooves to realize fixed mounting.
8. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the groove width of an arc elongated groove (41) on the arc extinguishing metal grid sheet (4) is gradually reduced.
9. The non-polar hvdc contactor arc extinguishing system in accordance with claim 1, wherein: the bottom surfaces of the arc extinction metal grid plates (4) incline upwards towards two sides, so that an included angle alpha is formed between the bottom surfaces of the arc extinction metal grid plates (4) and the upper surface of the cover seat (1), and the alpha is 5 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743871.8A CN111785572A (en) | 2020-07-29 | 2020-07-29 | Nonpolarity high voltage direct current contactor arc extinguishing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743871.8A CN111785572A (en) | 2020-07-29 | 2020-07-29 | Nonpolarity high voltage direct current contactor arc extinguishing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111785572A true CN111785572A (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010743871.8A Pending CN111785572A (en) | 2020-07-29 | 2020-07-29 | Nonpolarity high voltage direct current contactor arc extinguishing system |
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| CN (1) | CN111785572A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116895489A (en) * | 2023-05-26 | 2023-10-17 | 浙江金莱勒电气有限公司 | DC1500V arc extinguishing system and production process for producing same |
-
2020
- 2020-07-29 CN CN202010743871.8A patent/CN111785572A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116895489A (en) * | 2023-05-26 | 2023-10-17 | 浙江金莱勒电气有限公司 | DC1500V arc extinguishing system and production process for producing same |
| CN116895489B (en) * | 2023-05-26 | 2024-01-02 | 浙江金莱勒电气有限公司 | DC1500V arc extinguishing system and production process for producing same |
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