CN210039993U - Direct current breaker - Google Patents
Direct current breaker Download PDFInfo
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- CN210039993U CN210039993U CN201920968428.3U CN201920968428U CN210039993U CN 210039993 U CN210039993 U CN 210039993U CN 201920968428 U CN201920968428 U CN 201920968428U CN 210039993 U CN210039993 U CN 210039993U
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- arc
- magnetic sheet
- isolating
- circuit breaker
- direct current
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Abstract
The utility model discloses a direct current breaker relates to the circuit breaker field, and this direct current breaker contains an upper cover and a base that the intercombination is fixed, and the arc extinguishing system that is equipped with the explosion chamber, contains the contact system of moving contact and static contact and introduces the electric arc that produces between moving contact and the static contact in this base, the arc extinguishing system is including the last separated arc magnetic sheet of equipment in the upper cover, relative and the lower separated arc magnetic sheet of equipment on the base and be located separated arc magnetic sheet and the magnet between the separated arc magnetic sheet down with this last separated arc magnetic sheet, the arc extinguishing system forms the U type magnetic field that makes electric arc get into the explosion chamber fast. Through setting up arc magnetic sheet, lower arc magnetic sheet and magnet between the two, form U type magnetic field, utilize the lorentz force to introduce the arc into the arc extinguishing chamber for the moving speed of arc, make arc get into the explosion chamber in short time, shorten the time of arcing, improve the breaking capacity of circuit breaker, can effectively avoid the contact loss of burning.
Description
Technical Field
The utility model relates to a circuit breaker field especially relates to a direct current circuit breaker.
Background
A dc circuit breaker is an electrical appliance widely used in a dc power grid, and when a fault, such as an overload or a short circuit, occurs in a circuit, the dc circuit breaker can disconnect the protected circuit by disconnecting a fixed contact from a movable contact. When the circuit breaker is broken, electric arcs can be generated between the moving contact and the fixed contact of the circuit breaker, a large amount of heat is brought by the electric arcs, if the electric arcs stay between the moving contact and the fixed contact for too long time, the circuit breaker is likely to be burnt, and therefore the electric arcs need to be introduced into the arc extinguish chamber as soon as possible to be quenched quickly.
In order to achieve better arc quenching, a common method of the existing direct current circuit breaker is to arrange a magnetic blowing system in a breaking area of a fixed contact and a movable contact, wherein the magnetic blowing system is composed of two magnetic conducting sheets respectively arranged on a bottom shell and an upper cover of the circuit breaker, electric arcs generated between the movable contact and the fixed contact are acted by magnetic fields generated by the two magnetic conducting sheets and leave a contact area to enter an arc extinguishing chamber for arc quenching, however, the existing magnetic blowing system generates small magnetic field force, the moving speed of the electric arcs is relatively slow, the burning loss of the movable contact is serious, and the breaking capacity is not ideal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current breaker to the blowing speed of solving current direct current breaker is slow, the unsatisfactory problem of disjunction ability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a DC circuit breaker comprises an upper cover and a base which are combined and fixed with each other, wherein an arc extinguish chamber, a contact system comprising a moving contact and a fixed contact and an arc extinguish system for leading electric arc generated between the moving contact and the fixed contact into the arc extinguish chamber are arranged in the base, the arc extinguish system comprises an upper arc isolating magnetic sheet assembled in the upper cover, a lower arc isolating magnetic sheet which is opposite to the upper arc isolating magnetic sheet and assembled on the base and a magnet positioned between the upper arc isolating magnetic sheet and the lower arc isolating magnetic sheet, and the arc extinguish system forms a U-shaped magnetic field which enables the electric arc to enter the arc extinguish chamber quickly.
Further, the magnet is a strong magnet.
Furthermore, the upper arc-isolating magnetic sheet, the lower arc-isolating magnetic sheet and the magnet are arranged to have the same polarity direction.
Furthermore, an upper arc isolation plate for isolating the upper arc isolation magnetic sheet from the electric arc is assembled on the upper cover, and a lower arc isolation plate for isolating the lower arc isolation magnetic sheet from the electric arc is assembled on the base.
Furthermore, the upper arc isolating plate and the lower arc isolating plate are both made of gas production materials.
Furthermore, an operating assembly and an electromagnetic tripping assembly are further arranged in the base, the operating assembly comprises the moving contact, the electromagnetic tripping assembly comprises a magnetic yoke, an iron core and an instantaneous coil, the static contact is arranged on the magnetic yoke and is opposite to the moving contact, and the static contact and the moving contact are both positioned between the upper arc-isolating magnetic sheet and the lower arc-isolating magnetic sheet.
Further, the magnet yoke is connected with an arc striking plate for introducing electric arc into the arc extinguishing chamber, the arc striking plate is U-shaped, and the magnet is located in a U-shaped opening of the arc striking plate.
Compared with the prior art, the utility model has the advantages of it is following:
1. through setting up arc magnetic sheet, lower arc magnetic sheet and magnet between the two, form U type magnetic field, this direct current circuit breaker's breaking is gone on at this U type magnetic field, and application lorentz force introduces the arc into the arc extinguishing chamber with electric arc for the moving speed of electric arc makes electric arc get into the explosion chamber in the short time, shortens the arcing time, improves the breaking capacity of circuit breaker, can effectively avoid the contact loss of burning.
2. In a further improvement, the direct current circuit breaker is further provided with an upper arc isolating plate and a lower arc isolating plate to protect the upper arc isolating magnetic sheet and the lower arc isolating magnetic sheet from the influence of an electric arc, so that the direct current circuit breaker is ensured to provide a continuous and stable electromagnetic field. And the upper arc-isolating plate and the lower arc-isolating plate are made of gas-generating materials, which is equivalent to simultaneously carrying out magnetic blowing and gas blowing on the electric arc, the arc blowing is rapid, the cutting and cooling speeds of the electric arc are rapid, and the short-circuit breaking capacity of the direct-current circuit breaker is excellent.
Drawings
Fig. 1 is a front view of an internal structure of a dc circuit breaker according to an embodiment of the present invention with an upper cover removed;
fig. 2 is a front view of an upper cover of a dc circuit breaker according to an embodiment of the present invention;
fig. 3 is a front view of a dc circuit breaker according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of the relative positions of the upper arc-isolating magnet piece, the lower arc-isolating magnet piece and the magnet;
fig. 6 is a front view of fig. 5.
Detailed Description
The present invention will now be further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 6, a dc circuit breaker includes an upper cover and a base which are combined and fixed with each other, an arc extinguishing chamber 10, a contact system including a movable contact 4 and a stationary contact 5, and an arc extinguishing system for introducing an arc generated between the movable contact 4 and the stationary contact 5 into the arc extinguishing chamber 10 are installed in the base, the arc extinguishing system includes an upper arc-isolating magnetic sheet 11 assembled in the upper cover, a lower arc-isolating magnetic sheet 12 opposite to the upper arc-isolating magnetic sheet 11 and assembled on the base, and a magnet 9 located between the upper arc-isolating magnetic sheet 11 and the lower arc-isolating magnetic sheet 12, and the arc extinguishing system forms a U-shaped magnetic field for allowing the arc to rapidly enter the arc extinguishing chamber 10. The breaking of the circuit breaker current is carried out in a U-shaped magnetic field, and the Lorentz force is applied to introduce the arc into the arc extinguishing chamber 10, so that the arc is extinguished, and the arc extinguishing effect is greatly improved.
Specifically, the upper arc-isolating magnet piece 11, the lower arc-isolating magnet piece 12 and the magnet 9 are arranged to have the same polarity direction, for example, the S pole of the upper arc-isolating magnet piece is opposite to the N pole of the magnet 9, and the S pole of the magnet 9 is opposite to the N pole of the lower arc-isolating magnet piece 12, but the magnetic pole directions of the three are determined according to the current direction of the dc circuit breaker, and if the current direction of the dc circuit breaker is changed, the magnetic pole directions of the three are changed accordingly. The upper arc isolating magnetic sheet 11, the lower arc isolating magnetic sheet 12 and the magnet 9 form a U-shaped strong arc-blowing magnetic field in a breaking region of the contact system, and when the direct-current circuit breaker is in short circuit, the U-shaped magnetic field is beneficial to blowing the electric arc generated between the movable contact 4 and the static contact 5 out of the contact breaking region so as to enter the arc extinguish chamber 10. In the arc chute 10, the arc is divided by the arc chute pieces and extinguished.
Preferably, the upper cover is assembled with an upper arc-isolating plate 7 for isolating the upper arc-isolating magnetic piece 11 from the arc, and the base is assembled with a lower arc-isolating plate 8 for isolating the lower arc-isolating magnetic piece 12 from the arc, so that the upper arc-isolating magnetic piece 11 and the lower arc-isolating magnetic piece 12 are not directly exposed to the arc, thereby protecting the upper arc-isolating magnetic piece 11 and the lower arc-isolating magnetic piece 12 from the arc, and ensuring that they provide a continuous and stable electromagnetic field. Preferably, the magnet 9 is a strong magnet 9, and three stacked strong magnets 9 are arranged between the upper arc-isolating magnet piece 11 and the lower arc-isolating magnet piece 12.
As a further improvement, the upper arc baffle 7 and the lower arc baffle 8 are both made of gas generating material, such as POM or PA66, and the gas blowing arc is performed by the upper arc baffle 7 and the lower arc baffle 8. The dc circuit breaker performs magnetic blowing and gas blowing simultaneously on the electric arc, so that the electric arc rapidly enters the arc extinguishing chamber 10, thereby achieving the effect of rapidly extinguishing the electric arc.
In a specific structure, referring to fig. 1, an operating assembly 1 and an electromagnetic trip assembly 2 are further disposed in the base, the operating assembly 1 includes a moving contact 4, and the electromagnetic trip assembly 2 includes a magnetic yoke 3, an iron core, and an instant coil. The principle and structure of the operating assembly 1 and the electromagnetic trip assembly 2 of the dc circuit breaker in this embodiment are the same as those of the conventional dc circuit breaker, and are not described herein again. The static contact 5 is arranged on the magnetic yoke 3 and is opposite to the moving contact 4, and the static contact 5 and the moving contact 4 are both positioned between the upper arc-isolating magnetic sheet 11 and the lower arc-isolating magnetic sheet 12, namely the on-off position of the circuit breaker is positioned in a U-shaped magnetic field. The electromagnetic tripping component 2 is positioned above the arc extinguish chamber 10, the static contact 5 is positioned at the upper right corner of the arc extinguish chamber 10, the magnetic yoke 3 is connected with an arc striking plate 6 for leading electric arc into the arc extinguish chamber 10, the arc striking plate 6 is U-shaped, and the magnet 9 is positioned in a U-shaped opening of the arc striking plate 6 so as to prevent the electric arc from corroding the magnet 9.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (7)
1. The utility model provides a direct current circuit breaker, this direct current circuit breaker contain an upper cover and a base that the inter combination is fixed, the arc extinguishing system that is equipped with the explosion chamber in this base, contains the contact system of moving contact and static contact and introduces the arc that produces between moving contact and the static contact into the explosion chamber, its characterized in that: the arc extinguishing system comprises an upper arc-isolating magnetic sheet assembled in the upper cover, a lower arc-isolating magnetic sheet opposite to the upper arc-isolating magnetic sheet and assembled on the base, and a magnet positioned between the upper arc-isolating magnetic sheet and the lower arc-isolating magnetic sheet, and the arc extinguishing system forms a U-shaped magnetic field which enables electric arcs to rapidly enter the arc extinguishing chamber.
2. The direct current circuit breaker according to claim 1, characterized in that: the magnet is a strong magnet.
3. The direct current circuit breaker according to claim 1, characterized in that: the upper arc-isolating magnetic sheet, the lower arc-isolating magnetic sheet and the magnet are arranged to have the same polarity direction.
4. The direct current circuit breaker according to claim 1, characterized in that: the upper cover is assembled with an upper arc-isolating plate for isolating the upper arc-isolating magnetic sheet from the electric arc, and the base is assembled with a lower arc-isolating plate for isolating the lower arc-isolating magnetic sheet from the electric arc.
5. The direct current circuit breaker according to claim 4, characterized in that: the upper flash barrier and the lower flash barrier are both made of gas production materials.
6. The direct current circuit breaker according to claim 1, characterized in that: the base is further provided with an operating assembly and an electromagnetic tripping assembly, the operating assembly comprises the moving contact, the electromagnetic tripping assembly comprises a magnetic yoke, an iron core and an instantaneous coil, the fixed contact is arranged on the magnetic yoke and is opposite to the moving contact, and the fixed contact and the moving contact are both positioned between the upper arc-isolating magnetic sheet and the lower arc-isolating magnetic sheet.
7. The direct current circuit breaker according to claim 6, characterized in that: the magnet yoke is connected with an arc striking plate for leading electric arc into the arc extinguishing chamber, the arc striking plate is U-shaped, and the magnet is located in a U-shaped opening of the arc striking plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920968428.3U CN210039993U (en) | 2019-06-26 | 2019-06-26 | Direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920968428.3U CN210039993U (en) | 2019-06-26 | 2019-06-26 | Direct current breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210039993U true CN210039993U (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920968428.3U Active CN210039993U (en) | 2019-06-26 | 2019-06-26 | Direct current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210039993U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116031116A (en) * | 2022-12-20 | 2023-04-28 | 佛山市佳华电气科技有限公司 | Plastic case circuit breaker |
-
2019
- 2019-06-26 CN CN201920968428.3U patent/CN210039993U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116031116A (en) * | 2022-12-20 | 2023-04-28 | 佛山市佳华电气科技有限公司 | Plastic case circuit breaker |
| CN116031116B (en) * | 2022-12-20 | 2023-09-26 | 佛山市佳华电气科技有限公司 | Plastic case circuit breaker |
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| GR01 | Patent grant |