CN107248463B - Bidirectional direct current switch - Google Patents
Bidirectional direct current switch Download PDFInfo
- Publication number
- CN107248463B CN107248463B CN201710686228.4A CN201710686228A CN107248463B CN 107248463 B CN107248463 B CN 107248463B CN 201710686228 A CN201710686228 A CN 201710686228A CN 107248463 B CN107248463 B CN 107248463B
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- Prior art keywords
- arc
- extinguishing
- cover
- direct current
- contact
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Classifications
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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
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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
- H01H9/342—Venting arrangements for arc chutes
Abstract
The invention discloses a bidirectional direct current switch, which comprises two fixed contacts and an arc-extinguishing cover, wherein the fixed contacts are tightly matched with the arc-extinguishing cover, and permanent magnets are embedded in the arc-extinguishing cover and are arranged on two sides of the center line of the fixed contacts in a homopolar opposite mode; a moving contact is arranged below the static contact and is connected with a reciprocating mechanism, and a coil is arranged below the arc extinguishing cover and is used for controlling the reciprocating movement of the mechanism; the electric arc between the moving contact and the static contact is blown to the small arc extinguish chamber on the same side of the central line of the static contact under the action of the magnetic field force, so that the short circuit of the electric arc can not be caused. According to the invention, through the structural design of the permanent magnet and the small arc extinguish chamber, the creeping space of the electric arc is increased, the heat dissipation of the product is improved, the electric service life of the direct current switch is further obviously prolonged, and meanwhile, the bidirectional conduction function of the direct current switch can be realized, namely the nonpolarity requirement of a contact is met, so that the damage caused by the fact that the positive electrode and the negative electrode are connected in reverse can be avoided.
Description
Technical Field
The invention relates to a high-voltage direct-current switch, in particular to a bidirectional direct-current switch.
Background
Under the large background of climate warming and energy conservation and emission reduction, the industries of new energy automobiles and charging piles are rapidly developing in the global scope, Germany and France even propose that new automobiles can only be zero-emission automobiles from 2030 to 2040 respectively, and gasoline automobiles and diesel automobiles are forbidden to be sold; according to the new energy development planning in China, 1.2 thousands of electric vehicle charging stations are built in 2020, 450 thousands of charging piles are built, and the holding capacity of electric vehicles reaches 500 thousands.
The direct current switch (such as a high-voltage direct current relay and a high-voltage direct current contactor) is a necessary electrical component for controlling the on-off of a direct current circuit in an electric automobile and a charging pile, and is mainly applied to a BMS battery management system and a power battery pack in the electric automobile; in the charging pile, the direct current switch is used as an electrical switch for connecting the direct current charging pile with the automobile; when an electric switch breaks a circuit with high voltage and large current, electric arcs are often generated, the electric arcs are relatively easy to extinguish due to the existence of zero crossing points of alternating current, but direct current does not have zero crossing points, so that the electric arcs of the direct current switch are more difficult to extinguish, and the electric service life times of the direct current switch under the rated load condition are generally low. The direct current switch product in the industry utilizes permanent magnet to extinguish arc in a magnetic blow mode mostly, but direct current switch makes the direction of magnetic blow different because of the difference of current direction (positive negative pole is distinguished), and then leads to the electric life of product to have obvious difference because of the difference of positive and negative pole connection, and direct current switch is mostly the monopole, if the user connects the electrode conversely, will certainly lead to the life of product to reduce by a wide margin.
In addition to the electric automobile and charging pile industries, the demand of new energy industries such as photovoltaic and the like on a direct current switch is increasing day by day, and the product is required to meet certain electric service life indexes under the conditions of high voltage and large current; in addition, with the development of energy storage technology and energy internet, reverse charging between an electric vehicle and an energy storage power station or between the energy storage power station and a power grid is possible to realize in the future, redundant electric energy is returned to effectively utilize the electric energy, and at the moment, a direct current switch is also required to have a bidirectional conduction function.
Therefore, a design mode of a bidirectional conduction direct current switch is needed to be realized, and the problem of electric service life reduction caused by reverse connection of the positive electrode and the negative electrode is solved.
Disclosure of Invention
The invention aims to provide a bidirectional direct current switch, which increases the creeping space of an electric arc and the heat dissipation of a product through the structural design of a permanent magnet and a small arc extinguish chamber, further remarkably prolongs the electric service life of the direct current switch, and simultaneously can realize the bidirectional conduction function of the direct current switch, namely the nonpolarity requirement of a contact, and can avoid the harm caused by the reverse connection of a positive electrode and a negative electrode.
The invention provides a bidirectional direct current switch, which comprises a pair of static contacts, an arc-extinguishing cover and a coil, wherein the arc-extinguishing cover and the coil are surrounded by a magnetic conduction sleeve and are positioned in a shell formed by an upper cover and a base; the length direction of one permanent magnet or a plurality of permanent magnets on any side of the center line of the static contact is parallel to the center line; the maximum distance between the outer ends of one or more permanent magnets on any side of the center line is smaller than the maximum distance between the outer circles of the two static contacts.
Preferably, a plurality of small arc extinguishing chambers are formed in the arc extinguishing cover on two sides of the central line of the static contact, and an opening is formed in the inner side wall of each small arc extinguishing chamber, so that arc extinguishing gas forms an annular flowing loop.
Preferably, the flux sleeve is a square cylindrical metal sleeve structure, and a round angle is arranged at the junction of the square surface of the flux sleeve.
Preferably, the magnetic conductive sleeve is positioned in the base, and the arc extinguishing cover is respectively connected with the static contact and the magnetic conductive sleeve;
and a cavity is formed by a gap between the magnetic sleeve and the arc extinguishing cover, and arc extinguishing gas is sealed in the cavity.
Preferably, the coil is located below the arc extinguishing chamber, and a shaft sleeve made of a magnetic conductive material is embedded in the coil.
Preferably, a driving mechanism for switching on or off a circuit through reciprocating motion is arranged in the flux sleeve, the upper end of the driving mechanism is arranged in the arc extinguishing chamber, and the lower end of the driving mechanism is positioned in the coil.
Preferably, the upper cover is arranged above the arc extinguishing chamber; a thin wall extends out of the upper portion of the arc extinguishing chamber, and the thin wall penetrates through the groove of the upper cover and extends out of the upper cover.
Preferably, the outer contour of the upper part of the base is square, and a chamfer or a fillet is arranged at the joint of the square surfaces of the base.
Preferably, the upper cover is fixedly connected with the base through a buckle, and the buckle is arranged at the square surface joint of the base.
Preferably, the upper part of the static contact is provided with a thread; the middle part of the arc extinguishing chamber is provided with knurls and is fixed by epoxy resin filled between the upper cover and the arc extinguishing chamber; the lower part of the contact structure is a contact structure.
Compared with the prior art, the invention has the beneficial effects that: (1) the invention increases the magnetic blow-out force and the creeping distance of the electric arc through the design of the permanent magnet and the small arc extinguish chamber, so that the electric arc is easier to extinguish; meanwhile, the opening characteristics of the small arc extinguish chamber are matched with the structural design of the metal flux sleeve, so that the heat dissipation performance of the product is enhanced, and the electric service life of the direct current switch is obviously prolonged; (2) through the setting mode of permanent magnet, realize unipolar direct current switch's two-way conduction function, can avoid connecing the harm that the anti-production was produced of positive negative pole.
Drawings
FIG. 1 is a schematic front cross-sectional view of the present invention;
FIG. 2 is a schematic top cross-sectional view of the present invention;
fig. 3 to 6 are schematic diagrams illustrating the bidirectional conduction principle of the bidirectional dc switch according to the present invention;
FIG. 7 is a perspective view of the external structure of the present invention;
fig. 8 is a perspective view of the internal structure of the present invention.
Wherein, 1, an upper cover; 2. static contact; 3. an arc extinguishing chamber; 301. an outer peripheral contour wall of the arc chute; 3011. an inner projecting portion; 3012. an outer peripheral square portion; 302. an arc chute intermediate; 31. a first opening; 32. a second opening; 33. a third opening; 34. an outer sidewall; 4. a drive mechanism; 41. a moving contact; 42. a contact spring; 43. a shaft; 44. a movable iron core; 45. a clamp spring; 46. a return spring; 47. thin wall; 48. a groove; 49. buckling; 5. a flux sleeve; 6. a coil; 7. a shaft sleeve; 8. a base; 9. a stationary iron core; 10. and a permanent magnet.
Detailed Description
The present invention provides a bidirectional dc switch, which is further described below with reference to the accompanying drawings and embodiments in order to make the present invention more comprehensible.
As shown in fig. 1 and fig. 2, the bidirectional dc switch of the present invention mainly includes a pair of stationary contacts 2, a pair or more than a pair of permanent magnets 10, an upper cover 1, an arc extinguishing chamber 3, a metal flux sleeve 5, a driving structure 4, a coil 6, a stationary iron core 9, and a base 8.
The upper cover 1 is positioned above the arc-extinguishing chamber 3, and a thin wall 47 extends from the upper part of the arc-extinguishing chamber 3, and the thin wall 47 passes through a groove 48 of the upper cover 1 and extends out of the upper cover 1 for increasing the creepage distance between two static contacts 2.
The static contact 2 sequentially penetrates through the round hole of the upper cover 1 and the round hole of the arc-extinguishing chamber 3 from bottom to top and is located on the arc-extinguishing chamber 3. Wherein, the upper part of the static contact 2 is provided with threads, the lower part is provided with a contact, and the middle part with knurling characteristics is fixed by epoxy resin filled between the upper cover 1 and the arc extinguishing cover 3. The upper thread feature is used for wiring, the lower contact and the moving contact are connected and disconnected, and the knurling feature in the middle is fixed in epoxy resin and contributes to improving torsional strength.
The below of arc-extinguishing chamber 3 is equipped with quiet iron core 9, and coil 6 sets up the lower extreme at quiet iron core 9, and a axle sleeve 7 that constitutes by magnetic material is inlayed to the inside of coil 6, and the side and the bottom of arc-extinguishing chamber 3 and coil 6 all are surrounded by magnetic conductive sleeve 5.
The flux sleeve 5 may be a square cylindrical metal sleeve, and the junction of the square surfaces of the flux sleeve 5 has a fillet feature. The lower part of the magnetic sleeve 5 is arranged in the lower part of the base 8, and the lower part of the base 8 is polygonal; the contour of the upper part of the base 8 can be square, and the junction of the square surfaces has a chamfer or fillet characteristic. The upper part of the base 8 is fixedly connected with the lower part of the upper cover 1 through a buckle 49, and the buckle 49 is arranged at the joint of the square side surfaces of the upper part of the base 8.
Arc extinguishing gas (such as hydrogen, nitrogen and the like) is filled in a cavity formed by the magnetic sleeve 5 and the arc extinguishing cover 3, and the arc extinguishing gas is sealed in the cavity through epoxy resin.
A driving mechanism 4 which moves back and forth is arranged in the magnetic conduction sleeve 5, the upper end of the driving mechanism 4 is positioned in the arc extinguishing chamber 3, and the lower end is positioned in the coil 6.
The driving mechanism 4 includes a movable contact 41, a contact spring 42, a shaft 43, a movable iron core 44, a clamp spring 45, and a return spring 46. The moving contact 41 and the moving iron core 44 both penetrate through the shaft 43 and are positioned on the outer side of the shaft 43, and are respectively limited at the outer ends thereof through the clamp springs 45; the lower end of the movable contact 41 is in close contact with a contact spring 42 passing through a shaft 43, and the upper end of the movable iron core 44 is in close contact with the upper end of a return spring 46 passing through the shaft 43.
When the coil 6 is energized and under a certain voltage, the movable iron core 44 will overcome the spring reaction force of the return spring 46 and move toward the direction of the stationary iron core 9 under the action of electromagnetic force, and at the same time, the driving mechanism 4 will be driven to move upward integrally, so that the movable contact 41 contacts with the stationary contact 2, and the circuit is conducted.
When the coil 6 is powered off or the voltage drops to a certain value, the spring reaction force of the return spring 46 is greater than the electromagnetic force, so that the driving mechanism 4 returns to the original position under the action of the spring reaction force, the circuit is disconnected, that is, the driving mechanism 4 reciprocates through the control of the coil 6, and the main circuit formed by the fixed contact 2, the movable contact 41 and the external circuit is opened and closed.
As shown in figures 2 and 8, the arc chute 3 comprises an arc chute outer peripheral profile wall 301 and an arc chute intermediate body 302; the arc chute outer peripheral contoured wall 301, in turn, comprises an outer peripheral square portion 3012 and an inner convex portion 3011, and the arc chute intermediate 302 is provided with an outer sidewall 34 and an inner sidewall.
One or more pairs of permanent magnets 10 are embedded in the arc-extinguishing chamber intermediate body 302 of the arc-extinguishing chamber 3 and are limited by the outer side wall 34 of the arc-extinguishing chamber 3. The permanent magnets 10 are respectively located on both sides of the center line L1 of the two stationary contacts 2 and arranged in a homopolar opposing manner, as shown in fig. 2 to 6. At least one permanent magnet 10 is arranged on one side of the central line L1 of the two static contacts 2 along the positive direction of the Z axis, and the permanent magnet is parallel to the central lines L1 of the two static contacts 2. At least one permanent magnet 10 is arranged on one side of the central line L1 of the two static contacts 2 along the negative direction of the Z axis, and the permanent magnet 10 is arranged oppositely in the same pole with the permanent magnet 10 on one side of the positive direction of the Z axis. The length of a permanent magnet 10 on any side of the center line L1 is less than the maximum length B of the connecting line segment of two static contacts 2, or the maximum length a of the connecting line segment of a plurality of permanent magnets 10 on any side of the center line L1 is less than the maximum length B of the connecting line segment of two static contacts 2, so that a space is left for forming small arc-extinguishing chambers i, ii, iii and iv with a certain depth between the outer peripheral square part 3012 of the outer peripheral contour wall 301 of the arc-extinguishing chamber and the outer side wall 34 of the arc-extinguishing chamber intermediate body 302.
The electric arc blows to each little explosion chamber under the effect of magnetic blow-out, and the existence of little explosion chamber can increase the flow space of electric arc, is favorable to lengthening the arc extinguishing and makes it extinguish more fast.
The arc extinguishing chamber 3 is made of insulating materials, the small arc extinguishing chamber also avoids or reduces direct contact between electric arcs and the inner side wall of the arc extinguishing chamber 3, burning loss of the electric arcs to the arc extinguishing chamber 3 can be reduced, and gas production is reduced. Because the chamber formed by the magnetic sleeve 5 and the arc extinguishing cover 3 is filled with high-purity and high-pressure arc extinguishing gas, the insulating material generates gas to increase the internal gas pressure and reduce the purity of the internal gas, the increase of the gas pressure may cause the explosion of the product, and the reduction of the gas purity affects the arc extinguishing performance.
A square area V is formed among the inner protruding part 3011 of the arc-extinguishing cover outer peripheral outline wall 301, the arc-extinguishing cover intermediate body 302 and the magnetic conduction sleeve 5, and a first opening 31 and a second opening 32 are arranged between the inner protruding part 3011 of the arc-extinguishing cover outer peripheral outline wall 301 and the inner side wall of the arc-extinguishing cover intermediate body 302; the arc chute intermediate body 302 is provided with a third opening 33 as shown in figures 2 and 8. The gas around the stationary contact 2 expands due to heating and flows in the direction indicated by the arrow in fig. 8.
The design of the openings allows the arc and gas flow to follow a circular loop in the direction of the arrows in figure 8, increasing the speed of the arc flow and the arc is extinguished in a narrow passage in the form of a labyrinth formed by the intermediate body 302 of the arc chute and the inner projection 3011 of the outer peripheral profile wall 301 of the arc chute. Wherein, the direction pointed by the arrow in fig. 8 specifically is: the high-temperature gas flows after being heated and expanded, firstly passes through the second opening 32, then passes through the first opening 31, then enters the square region v, is subjected to heat dissipation through the magnetic conductive sleeve 5 made of the metal material, and then flows into the middle region (i.e., the region where the moving contact 41 and the static contact 2 are located) of the arc-extinguishing chamber 3 through the third opening 33, so that a closed-loop airflow loop is formed on one side of each static contact 2 on the center line L1.
Through the small arc extinguish chamber and the opening design, the electric arc can have larger flowing space and faster flowing speed; meanwhile, the labyrinth design with a plurality of openings in the arc extinguishing cover 3 is beneficial to arc extinguishing and air flow circulation and cooling, so that the electric service life of the direct current switch can be greatly prolonged.
The method for realizing the bidirectional conduction function of the bidirectional direct current switch comprises the following steps:
as shown in fig. 3 and 4, the permanent magnets 10 are disposed on both sides of the center line L1 of the two stationary contacts 2 and are disposed in opposite directions of homopolarity, and due to the characteristic that the homopolarity of the permanent magnets 10 repel each other, the direction of the magnetic lines of force in the magnetic field is indicated by the curved arrows in fig. 3, 4, 5 and 6. Wherein, the X axis is vertical to the paper surface, and the Z axis and the Y axis are parallel to the paper surface; the positive Y-axis direction is the right side, and the negative Y-axis direction is the left side.
As shown in fig. 3, when the permanent magnet 10 is N-pole opposed, according to the left-hand rule principle, if the left stationary contact 2 is a positive pole, the current enters into the vertical paper (x represents the current enters into the vertical paper), the direction of the lorentz force F applied to the arc is the positive direction of the Z-axis, and the arc is blown into the small arc-extinguishing chamber i along the positive direction of the Z-axis under the action of the lorentz force F; the right static contact 2 is a negative electrode, current flows out of the plane of the paper (indicated by "·") vertically, the direction of the lorentz force F borne by the arc is the positive direction of the Z axis, and the arc is blown into the small arc-extinguishing chamber II along the positive direction of the Z axis under the action of the lorentz force F.
As shown in fig. 4, when the permanent magnet 10 is N-pole-opposed, according to the left-hand rule principle, if the left stationary contact 2 is a negative pole, the current flows out perpendicular to the paper surface, the direction of the lorentz force F applied to the arc is the negative direction of the Z-axis, and the arc is blown into the small arc-extinguishing chamber iii along the negative direction of the Z-axis under the action of the lorentz force F; the static contact 2 on the right side is a positive pole, current enters the static contact in a direction perpendicular to the paper surface, the direction of Lorentz force F borne by the arc is the negative direction of the Z axis, and the arc is blown into the small arc extinguish chamber IV along the negative direction of the Z axis under the action of the Lorentz force F.
As shown in fig. 5, when the permanent magnet 10 is S-pole-opposed, according to the left-hand rule principle, if the left stationary contact 2 is a positive pole, the current enters perpendicular to the paper surface, the direction of the lorentz force F applied to the arc is the negative direction of the Z-axis, and the arc is blown into the small arc-extinguishing chamber iii along the negative direction of the Z-axis under the action of the lorentz force F; the static contact 2 on the right side is a negative electrode, current flows out perpendicular to the paper surface, the direction of Lorentz force F borne by the arc is the negative direction of the Z axis, and the arc is blown into the small arc extinguish chamber IV along the negative direction of the Z axis under the action of the Lorentz force F.
As shown in fig. 6, when the permanent magnet 10 is S-pole opposite, if the left stationary contact 2 is a negative pole, the current flows out perpendicular to the paper surface, the direction of the lorentz force F applied to the arc is the positive direction of the Z axis, and the arc is blown into the small arc-extinguishing chamber i along the positive direction of the Z axis under the action of the lorentz force F; the static contact 2 on the right side is the positive pole, and the electric current gets into perpendicular to the paper, and the direction of the lorentz force F that the electric arc received is the positive direction of Z axle, and under the effect of lorentz force F, the electric arc is blown into little explosion chamber II along the Z axle positive direction.
In summary, with the bidirectional dc switch of the present invention, as long as the permanent magnets 10 are arranged in opposite polarities, no matter how the positive and negative poles of the static contact 2 are connected, the arc will be blown into the small arc-extinguishing chamber on the same side of the center line L1 of the static contact 2 under the action of the lorentz force. The arc flow directions generated by the two fixed contacts 2 are parallel to each other and along the Z-axis direction, and cannot move along the Y-axis direction to cause short circuit. In addition, the two sides of the center line L1 of the two static contacts 2 are arranged approximately symmetrically, i.e. the arc flowing spaces on the two sides are not significantly different, no matter how the positive and negative electrodes are connected, the flowing and extinguishing of the arc are not significantly different, i.e. the electrical life is not significantly different, so that the non-polar wiring mode of the direct current switch, i.e. the function of bidirectional conduction, is realized.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A bidirectional direct current switch comprises a pair of static contacts (2), an arc extinguishing cover (3) and a coil (6), wherein the arc extinguishing cover (3) and the coil (6) are surrounded by a magnetic conductive sleeve (5) and are located in a shell formed by an upper cover (1) and a base (8), more than one pair of permanent magnets (10) are embedded in the arc extinguishing cover (3), and the bidirectional direct current switch is characterized in that any pair of permanent magnets (10) are respectively positioned on two sides of a central line (L1) of the two static contacts (2) and are oppositely arranged in the same pole; the length direction of one permanent magnet (10) or a plurality of permanent magnets (10) on any side of the central line (L1) of the static contact (2) is parallel to the central line (L1); the maximum distance (A) between the outer ends of one or more permanent magnets (10) on any side of the central line (L1) is smaller than the maximum distance (B) between the outer circles of two static contacts (2), so that the distance between the outer ends of one or more permanent magnets (10) is larger than the maximum distance (B) between the outer circles of two static contacts (2), and the two static
A plurality of small arc extinguishing chambers are formed in the arc extinguishing cover (3) on two sides of the central line (L1) of the static contact (2);
the inside wall of every little explosion chamber is equipped with the opening, makes the arc extinguishing gas form the annular loop that flows, specifically is:
a square area (V) is formed among the inner protruding part (3011) of the outer peripheral outline wall (301) of the arc-extinguishing chamber, the arc-extinguishing chamber intermediate body (302) and the magnetic conduction sleeve (5), a first opening (31) and a second opening (32) are arranged between the inner protruding part (3011) of the outer peripheral outline wall (301) of the arc-extinguishing chamber and the inner side wall of the arc-extinguishing chamber intermediate body (302), and the arc-extinguishing chamber intermediate body (302) is provided with a third opening (33);
the high-temperature gas flows after being heated and expanded, firstly passes through the second opening (32), then enters the square region (V) after passing through the first opening (31), is subjected to heat dissipation through the magnetic conductive sleeve (5) made of a metal material, and then flows into the middle region of the arc extinguishing cover (3) through the third opening (33), so that a closed-loop airflow loop is formed on one side of the center line (L1) of each static contact (2).
2. A bi-directional dc switch according to claim 1, characterized in that said flux sleeve (5) is a square cylindrical metal sleeve structure with rounded corners at the junction of the square faces.
3. A bidirectional dc switch according to claim 1 or 2, characterized in that said flux sleeve (5) is located inside said base (8), and said arc-extinguishing chamber (3) is connected to said stationary contact (2) and said flux sleeve (5), respectively; and a cavity is formed in a gap between the magnetic sleeve (5) and the arc extinguishing cover (3), and arc extinguishing gas is sealed in the cavity.
4. A bi-directional dc switch according to claim 1, characterized in that the coil (6) is located below the arc chute (3), and a bushing (7) made of magnetically conductive material is embedded inside the coil (6).
5. A bidirectional DC switch according to claim 1 or 4, characterized in that a driving mechanism (4) for conducting or breaking the circuit by reciprocating motion is arranged in the magnetic conductive sleeve (5), the upper end of the driving mechanism (4) is arranged in the arc-extinguishing chamber (3), and the lower end is arranged in the coil (6).
6. A bi-directional dc switch according to claim 1, characterized in that the upper cover (1) is arranged above the arc chute (3); a thin wall (47) extends out of the upper part of the arc extinguishing cover (3), and the thin wall (47) penetrates through a groove (48) of the upper cover (1) and extends out of the upper cover (1).
7. A bi-directional dc switch according to claim 1, characterized in that the outer contour of the upper part of the base (8) is square, and the junction of the square faces is provided with a chamfer or a fillet.
8. A bi-directional DC switch according to claim 1 or 7, characterized in that the upper cover (1) is fixedly connected to the base (8) by means of a snap (49), the snap (49) being arranged at the junction of the square faces of the base (8).
9. A bidirectional dc switch according to claim 3, characterized in that the upper part of said stationary contact (2) is provided with a thread; the middle part of the arc extinguishing chamber is provided with knurls and is fixed by epoxy resin filled between the upper cover (1) and the arc extinguishing chamber (3); the lower part of the contact structure is a contact structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686228.4A CN107248463B (en) | 2017-08-11 | 2017-08-11 | Bidirectional direct current switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686228.4A CN107248463B (en) | 2017-08-11 | 2017-08-11 | Bidirectional direct current switch |
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| CN107248463A CN107248463A (en) | 2017-10-13 |
| CN107248463B true CN107248463B (en) | 2019-12-24 |
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| WO2021239367A1 (en) * | 2020-05-28 | 2021-12-02 | Tdk Electronics Ag | Switching device |
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| CN109273314A (en) * | 2018-11-23 | 2019-01-25 | 上海为鹏科技有限公司 | A kind of high power DC electric switch |
| CN111863481B (en) * | 2020-03-23 | 2022-06-28 | 中国航天时代电子有限公司 | High-reliability long-life limiting arc extinguish chamber |
| CN111564339B (en) * | 2020-06-19 | 2022-06-10 | 哈尔滨工业大学 | Miniature sealed electromagnetic relay bottom plate underlying arc extinguishing structure |
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Also Published As
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| CN107248463A (en) | 2017-10-13 |
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