CN111863561A - AC/DC universal arc extinguishing method, arc extinguishing device and miniature circuit breaker - Google Patents
AC/DC universal arc extinguishing method, arc extinguishing device and miniature circuit breaker Download PDFInfo
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- CN111863561A CN111863561A CN202010747017.9A CN202010747017A CN111863561A CN 111863561 A CN111863561 A CN 111863561A CN 202010747017 A CN202010747017 A CN 202010747017A CN 111863561 A CN111863561 A CN 111863561A
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- arc
- permanent magnet
- arc extinguishing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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Abstract
The invention provides an alternating current and direct current universal arc extinguishing method, an arc extinguishing device and a miniature circuit breaker, wherein magnetic fields with opposite polarities are applied to two sides of a discharge structure formed by a moving contact and a static contact, the magnetic fields generated in the area between the moving contact and the static contact are mutually offset, and an electric arc moves towards an arc extinguishing chamber under the action of self current and the magnetic field generated by a conductive structure no matter the direction of the electric arc current, so that the arc striking and breaking of the alternating current and direct current are realized. The invention also provides an arc extinguishing device for realizing the arc extinguishing method and a miniature circuit breaker applying the arc extinguishing device. The structure of the invention is simple, solves the problems of universality and direct-current non-polar breaking of the miniature circuit breaker in an alternating-current and direct-current system, and has considerable application prospect.
Description
Technical Field
The invention belongs to the field of circuit breakers, and particularly relates to an alternating current and direct current universal arc extinguishing method, an arc extinguishing device and a miniature circuit breaker.
Background
The low-voltage circuit breaker is an important control and protection device in a low-voltage distribution system and is responsible for breaking rated current, overload current and short-circuit current. The low-voltage circuit breaker breaks the alternating current and mainly depends on a grid plate arc extinguishing chamber to limit the alternating current, and medium recovery of arc gap gas is completed at the moment of zero crossing of the alternating current, so that the electric arc is extinguished; different from the zero-crossing point of the direct current, the low-voltage direct current circuit breaker needs to increase the arc voltage to a high enough value so that the direct current starts to decrease, the zero-crossing point of the current is finally manufactured, and the arc is extinguished. On the other hand, alternating current has no difference in direction, direct current has direction division, and the breaking difficulty of direct current is much higher than that of alternating current, so that a general direct current circuit breaker adopts a permanent magnet to drive direct current electric arc to enter an arc extinguish chamber, and the direction of the direct current electric arc is specifically limited. Therefore, the breaker with the universal alternating current and direct current is designed to fill the technical blank and reduce the product cost.
Disclosure of Invention
The invention aims to provide an alternating current and direct current universal arc extinguishing method, an arc extinguishing device and a miniature circuit breaker aiming at the problem that direct current and alternating current cannot be extinguished in one mode in the prior art, so that nonpolar breaking of direct current is realized.
In order to achieve the purpose, the invention has the following technical scheme:
an arc extinguishing method for AC/DC (alternating current/direct current) comprises the following steps:
firstly, applying magnetic fields with opposite polarities on two sides of a discharge structure formed by a moving contact and a fixed contact, and offsetting the magnetic fields generated in the region between the moving contact and the fixed contact to enable an electric arc to move towards an arc extinguish chamber under the self current and the magnetic field generated by a conductive structure;
and step two, the arc extinguishing chamber is used for extinguishing the arc.
Preferably, the step of magnetically conducting the lower region of the applied magnetic field enhances the action of the magnetic field in the lower region on the arc and promotes the arc to move towards the arc chute.
The invention also provides an AC/DC universal arc extinguishing device, which comprises a moving contact and a static contact which are oppositely arranged, wherein a discharge structure is formed by the moving contact and the static contact; the outer sides of the first permanent magnet and the second permanent magnet are respectively provided with a first arc isolating wall and a second arc isolating wall, and the first arc isolating wall and the second arc isolating wall are opposite to the discharge structure; and a movable arc striking plate is arranged below the discharging structure, and the space between the movable arc striking plate and the discharging structure, between the first permanent magnet and the second permanent magnet is connected with the arc extinguish chamber.
Preferably, a first magnetizer and a second magnetizer are arranged at the outer sides of the first permanent magnet and the second permanent magnet, and the first magnetizer and the second magnetizer are respectively positioned below the first arc-isolating wall and the second arc-isolating wall.
Preferably, the first permanent magnet and the second permanent magnet are plate-shaped structures with the same shape, and the first magnetizer and the second magnetizer are formed by one piece of magnetic conductive material plate or a plurality of pieces of magnetic conductive material plates in a superposition mode; the movable arc striking plate is provided with an arc surface, and the arc surface starts to extend to the lower part of the arc extinguishing chamber from the movable arc striking plate.
Preferably, the first permanent magnet, the second permanent magnet, and the first magnetizer and the second magnetizer are all processed into arcs with the same profile as the arc surface from the bottom to the side surface.
Preferably, a plurality of arc guide grooves are formed in the inner walls of the first permanent magnet and the second permanent magnet, and the arc guide grooves are formed in the direction from the discharge structure to the arc extinguish chamber.
Preferably, the magnetic conductive material plate is an iron plate or a magnetic steel plate.
Preferably, the first arc isolating wall and the second arc isolating wall are made of insulating high-temperature-resistant materials; the insulating high-temperature-resistant material comprises any one or a combination of more of mass mold plastic DMC, nylon plastic PA6, nylon plastic PA66 and ceramics.
The invention also provides an AC/DC universal miniature circuit breaker, which adopts the AC/DC universal arc extinguishing device.
Compared with the prior art, the invention has the following beneficial effects: because the structure difference of general direct current circuit breaker and alternating current circuit breaker is great, can't be general, consequently design the general circuit breaker structure of alternating current-direct current can greatly reduced product manufacturing cost, improve the commonality of product. When designing the universal miniature circuit breaker of alternating current-direct current, the problem that the key needs to solve is the striking of the forward and reverse electric arc. The invention sets the first permanent magnet and the second permanent magnet on two sides of the discharge structure formed by the moving contact and the static contact to apply magnetic fields with opposite polarities, the N poles of the first permanent magnet and the second permanent magnet are opposite or the S poles of the first permanent magnet and the second permanent magnet are opposite, the magnetic fields generated in the area between the moving contact and the static contact are mutually offset, no matter how the direction of the electric arc current is, the electric arc can move towards the arc extinguish chamber under the self current and the magnetic field generated by the conductive structure, thereby realizing the arc striking and breaking of the alternating current and direct current. The invention has simple structure, solves the problems of universality and direct-current nonpolar breaking of the miniature circuit breaker in an alternating-current and direct-current system, and has considerable application prospect.
Drawings
In order to illustrate embodiments of the invention or solutions of the prior art more clearly, the drawings that are needed for use are briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.
Fig. 1 is an exploded view of an arc extinguishing device structure in which three magnetic conductive plates are stacked to form a magnetic conductor according to an embodiment of the present invention;
fig. 2 is a schematic side view of an arc extinguishing device in which three magnetic conductive plates are stacked to form a magnetic conductor according to an embodiment of the present invention;
fig. 3 is an exploded view of an arc extinguishing device structure in which two magnetic conductive plates are stacked in two magnetic conductive bodies according to an embodiment of the present invention;
fig. 4 is an exploded view of an arc extinguishing device in which a single-piece magnetic conductive plate is used as a three-magnetizer according to an embodiment of the present invention;
FIG. 5 is an exploded view of a fourth embodiment of an arc extinguishing device without a magnetizer according to the present invention;
in the drawings: 1-moving contact; 2, static contact; 3-1. a first permanent magnet; 3-2. a second permanent magnet; 4-1, a first flash barrier; 4-2. a second flash barrier; 5-1, a first magnetizer; 5-2. a second magnetizer; 6-an arc extinguishing chamber; 7-moving arc striking pieces.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, which are only a part of the examples of the present invention, but not all of the examples. It should be noted that the embodiments and features of the embodiments recited in the present invention may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 and 2, the invention provides an alternating current and direct current universal arc extinguishing device, which comprises a moving contact 1 and a static contact 2 which are oppositely arranged, wherein the moving contact 1 and the static contact 2 form a discharging structure, a first permanent magnet 3-1 and a second permanent magnet 3-2 are arranged on two sides of the discharging structure, and the N poles or the S poles of the first permanent magnet 3-1 and the second permanent magnet 3-2 are opposite; the outer sides of the first permanent magnet 3-1 and the second permanent magnet 3-2 are respectively provided with a first arc isolating wall 4-1 and a second arc isolating wall 4-2, and the first arc isolating wall 4-1 and the second arc isolating wall 4-2 are opposite to the discharge structure. The first arc isolating wall 4-1 and the second arc isolating wall 4-2 are made of insulating high-temperature-resistant materials, and the insulating high-temperature-resistant materials comprise any one or a combination of a plurality of materials selected from the group consisting of mass mold plastic DMC, nylon plastic PA6, nylon plastic PA66 and ceramics. The outer sides of the first permanent magnet 3-1 and the second permanent magnet 3-2 are provided with a first magnetizer 5-1 and a second magnetizer 5-2, and the first magnetizer 5-1 and the second magnetizer 5-2 are respectively positioned below the first arc-isolating wall 4-1 and the second arc-isolating wall 4-2. The first permanent magnet 3-1 and the second permanent magnet 3-2 are in plate-shaped structures with the same shape, the first magnetizer 5-1 and the second magnetizer 5-2 are formed by overlapping three magnetic conductive material plates, and the magnetic conductive material plates are iron plates or magnetic steel plates. The movable arc striking plate 7 is provided with an arc-shaped surface, and the arc-shaped surface initially extends to the lower part of the arc extinguishing chamber 6 from the movable arc striking plate 7 to play a role in guiding electric arcs. The bottom to the side surface of the first permanent magnet 3-1, the second permanent magnet 3-2, the first magnetizer 5-1 and the second magnetizer 5-2 are processed into an arc shape which is consistent with the arc surface profile of the movable striking plate 7. The inner walls of the first permanent magnet 3-1 and the second permanent magnet 3-2 are provided with three arc guide grooves which are arranged along the direction from the discharge structure to the arc extinguish chamber 6. And a movable arc striking sheet 7 is arranged below the discharging structure, and the movable arc striking sheet 7 is connected with the discharging structure, and a space between the first permanent magnet 3-1 and the second permanent magnet 3-2 and the arc extinguishing chamber 6.
Example two
Referring to fig. 3, a first magnetizer 5-1 and a second magnetizer 5-2 are disposed outside the first permanent magnet 3-1 and the second permanent magnet 3-2, the first magnetizer 5-1 and the second magnetizer 5-2 are formed by stacking two sheets of magnetic conductive material, and other structures are the same as those of the first embodiment.
EXAMPLE III
Referring to fig. 4, a first magnetizer 5-1 and a second magnetizer 5-2 are disposed outside the first permanent magnet 3-1 and the second permanent magnet 3-2, the first magnetizer 5-1 and the second magnetizer 5-2 are made of single-piece magnetic conductive material plates, and other structures are the same as those of the first embodiment.
Example four
Referring to fig. 5, the first magnetizer 5-1 and the second magnetizer 5-2 are not disposed outside the first permanent magnet 3-1 and the second permanent magnet 3-2, and other structures are the same as those of the first embodiment.
The invention also provides an AC/DC universal miniature circuit breaker, which adopts the AC/DC universal arc extinguishing device.
The invention also provides an AC/DC universal arc extinguishing method, which comprises the following steps:
firstly, applying magnetic fields with opposite polarities on two sides of a discharge structure formed by a movable contact 1 and a fixed contact 2, and offsetting the magnetic fields generated in the area between the movable contact 1 and the fixed contact 2 to enable electric arcs to move towards an arc extinguish chamber 6 under the action of self current and the magnetic field generated by a conductive structure; the magnetic conduction can be carried out on the lower area of the applied magnetic field, the effect of the magnetic field of the lower area on the electric arc is enhanced, and the electric arc is promoted to move towards the arc extinguishing chamber 6. The arc is then extinguished in the arc extinguishing chamber 6.
The main working principle of the invention is as follows: when the circuit breaker is used for breaking current, no matter how the direction of the current is, an electric arc is generated between the movable contact 1 and the static contact 2, and the electric arc moves towards the arc angle direction mainly under the current of the electric arc and the magnetic field generated by the conductive structure of the movable contact and the static contact because the magnetic fields generated by the oppositely arranged permanent magnets in the area between the movable contact and the static contact are mutually offset; after the electric arc moves to the arc angle, the magnetic field in the area below the permanent magnet can be strengthened to act on the electric arc due to the arrangement of the magnetizer below the arc isolating wall, the directions of the magnetic lines of force close to the two side areas of the arc isolating wall are opposite, the electric arc can be enabled to be close no matter the direction of the electric arc current, the electric arc is pushed to the arc isolating wall on one side of the arc extinguishing chamber, and therefore the arc striking and breaking of the alternating current and direct current are achieved.
In conclusion, the AC/DC universal arc extinguishing method, the arc extinguishing device and the miniature circuit breaker provided by the invention have simple structure arrangement, and solve the problems of universality and DC non-polar breaking of the miniature circuit breaker in an AC/DC system.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall within the protection scope covered by the claims.
Claims (10)
1. An arc extinguishing method for alternating current and direct current is characterized by comprising the following steps:
firstly, applying magnetic fields with opposite polarities on two sides of a discharge structure formed by a movable contact (1) and a fixed contact (2), and offsetting the magnetic fields generated in the region between the movable contact (1) and the fixed contact (2) to enable an electric arc to move towards an arc extinguish chamber (6) under the action of self current and the magnetic field generated by a conductive structure;
and step two, arc extinguishing of the arc is performed by the arc extinguishing chamber (6).
2. The method of claim 1, wherein: the step is to conduct magnetism to the lower area of the applied magnetic field, so as to enhance the effect of the magnetic field of the lower area on the electric arc and promote the electric arc to move to the arc extinguishing chamber (6).
3. The utility model provides an alternating current-direct current general arc control device which characterized in that: the device comprises a moving contact (1) and a static contact (2) which are arranged oppositely, wherein the moving contact (1) and the static contact (2) form a discharge structure, a first permanent magnet (3-1) and a second permanent magnet (3-2) are arranged on two sides of the discharge structure, and the N poles or S poles of the first permanent magnet (3-1) and the second permanent magnet (3-2) are opposite;
the outer sides of the first permanent magnet (3-1) and the second permanent magnet (3-2) are respectively provided with a first arc isolating wall (4-1) and a second arc isolating wall (4-2), and the positions of the first arc isolating wall (4-1) and the second arc isolating wall (4-2) are opposite to the discharge structure;
a movable arc striking plate (7) is arranged below the discharging structure, and the space between the movable arc striking plate (7) and the discharging structure, between the first permanent magnet (3-1) and between the movable arc striking plate and the second permanent magnet (3-2) is connected with the arc extinguishing chamber (6).
4. The ac-dc universal arc extinguishing device according to claim 3, wherein: the first magnetic conductor (5-1) and the second magnetic conductor (5-2) are arranged on the outer sides of the first permanent magnet (3-1) and the second permanent magnet (3-2), and the first magnetic conductor (5-1) and the second magnetic conductor (5-2) are respectively positioned below the first arc-separating wall (4-1) and the second arc-separating wall (4-2).
5. The ac-dc universal arc extinguishing device according to claim 4, wherein:
the first permanent magnet (3-1) and the second permanent magnet (3-2) adopt plate-shaped structures with the same shape, and the first magnetizer (5-1) and the second magnetizer (5-2) are formed by one piece of magnetic conductive material plate or a plurality of pieces of magnetic conductive material plates in a superposed mode; the movable arc striking plate (7) is provided with an arc-shaped surface, and the arc-shaped surface starts to extend to the lower part of the arc extinguishing chamber (6) from the movable arc striking plate (7).
6. The ac-dc universal arc extinguishing device according to claim 5, wherein:
the bottom to the side surface of the first permanent magnet (3-1), the second permanent magnet (3-2), the first magnetizer (5-1) and the second magnetizer (5-2) are processed into an arc shape consistent with the profile of the arc surface.
7. The ac-dc universal arc extinguishing device according to claim 5, wherein: the inner walls of the first permanent magnet (3-1) and the second permanent magnet (3-2) are provided with a plurality of arc guide grooves, and the arc guide grooves are formed along the direction from the discharge structure to the arc extinguish chamber (6).
8. The ac-dc universal arc extinguishing device according to claim 5, wherein:
the magnetic conductive material plate is an iron plate or a magnetic steel plate.
9. The ac-dc universal arc extinguishing device according to claim 3, wherein: the first arc isolating wall (4-1) and the second arc isolating wall (4-2) are made of insulating high-temperature-resistant materials; the insulating high-temperature-resistant material comprises any one or a combination of more of mass mold plastic DMC, nylon plastic PA6, nylon plastic PA66 and ceramic.
10. The utility model provides a general miniature circuit breaker of alternating current-direct current which characterized in that: the arc extinguishing device for alternating current and direct current according to any one of claims 3 to 9 is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747017.9A CN111863561A (en) | 2020-07-29 | 2020-07-29 | AC/DC universal arc extinguishing method, arc extinguishing device and miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747017.9A CN111863561A (en) | 2020-07-29 | 2020-07-29 | AC/DC universal arc extinguishing method, arc extinguishing device and miniature circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN111863561A true CN111863561A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010747017.9A Pending CN111863561A (en) | 2020-07-29 | 2020-07-29 | AC/DC universal arc extinguishing method, arc extinguishing device and miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111863561A (en) |
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2020
- 2020-07-29 CN CN202010747017.9A patent/CN111863561A/en active Pending
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Address after: 710000 room 611, 6 / F, building C1, Alibaba Silk Road headquarters, phase II, software new town, No. 156, Tiangu 8th Road, yuhuazhai street, high tech Zone, Xi'an, Shaanxi Province Applicant after: Xi'an zero one intelligent electric appliance Co.,Ltd. Address before: 325600 No.222 Weiwu Road, Yueqing Economic Development Zone, Wenzhou City, Zhejiang Province Applicant before: ZHEJIANG LINGYI INTELLIGENT ELECTRIC APPLIANCE RESEARCH INSTITUTE Co.,Ltd. |
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Effective date of registration: 20211217 Address after: 325600 leshang entrepreneurship Park, Yueqing Bay port area, Yueqing City, Wenzhou City, Zhejiang Province (in Yueqing developed technology Co., Ltd.) Applicant after: ZHEJIANG CHANGYOU ELECTRIC CO.,LTD. Address before: 710000 room 611, 6 / F, building C1, Alibaba Silk Road headquarters, phase II, software new town, No. 156, Tiangu 8th Road, yuhuazhai street, high tech Zone, Xi'an, Shaanxi Province Applicant before: Xi'an zero one intelligent electric appliance Co.,Ltd. |