CN218769325U

CN218769325U - Low-voltage direct-current circuit breaker arc extinguish chamber assembly structure

Info

Publication number: CN218769325U
Application number: CN202223006861.XU
Authority: CN
Inventors: 陈咸; 李冰燕; 方占云
Original assignee: Westinghouse Switchgear Jiangsu Co ltd
Current assignee: Westinghouse Switchgear Jiangsu Co ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-03-28
Anticipated expiration: 2032-11-11

Abstract

The utility model provides a low pressure direct current circuit breaker explosion chamber assembly structure, including explosion chamber and static contact, the explosion chamber includes: the bracket is of an integrally formed structure and comprises a first side plate part and a second side plate part which are symmetrically arranged and a connecting plate part for connecting the first side plate part and the second side plate part; the three parts are enclosed together to form a U-shaped cavity, the opening of the U-shaped cavity is arranged in the lateral direction and is in a horn shape, the connecting plate part is provided with a moving channel penetrating through the U-shaped cavity along the thickness direction, the opposite sides of the first side plate part and the second side plate part are symmetrically provided with a plurality of mounting grooves, the mounting grooves are arranged in parallel at intervals, the opening of the mounting groove extends to the outer end of the side plate part, and the rear side of the connecting plate part is symmetrically provided with two containing cavities by the vertical central line of the moving channel; the arc extinguishing grid plate is inserted into the mounting groove; and the two permanent magnets are respectively arranged in the two accommodating cavities. The utility model has the advantages of simple integral structure, simple to operate, the arc extinguishing is efficient and life is of a specified duration.

Description

Low-voltage direct-current circuit breaker arc extinguish chamber assembly structure

Technical Field

The utility model relates to a low-voltage direct current moulded case circuit breaker technical field, more specifically relate to a low-voltage direct current circuit breaker explosion chamber assembly structure.

Background

The proportion of clean energy in national energy consumption is on the trend of rising year by year, wherein the application proportion of wind power and photovoltaic is particularly prominent, and the application of a low-voltage direct-current circuit breaker is more extensive. Based on the characteristics of direct current, the direct current on-off cannot extinguish the electric arc by means of current zero crossing points, and the direct current electric arc can be extinguished only by means of an over-hard arc extinguishing system of the circuit breaker. On the other hand, in photovoltaic power generation, a large number of photovoltaic cell modules are connected in series and in parallel to realize power generation and transmission of direct current, and a direct current system has large short-circuit current and small critical fault current.

However, the existing arc extinguish chamber structure has the following problems: 1. the assembly is complex; 2. the structure is not beneficial to arc transfer; 3. the permanent magnet installed in the direct current arc extinguish chamber can not be well protected by the arc extinguish chamber shell, so that the permanent magnet is influenced by electric arc and high-temperature gas to be demagnetized or the magnetic attraction is weakened, the open circuit current can not be well cut off, and safety accidents are easily caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to disclose a low pressure direct current circuit breaker explosion chamber assembly structure, its easily assembly can enough solve the problem of traditional direct current explosion chamber assembly difficulty, has also kept the good characteristic who extinguishes direct current electric arc simultaneously.

In order to realize the above object, the utility model provides a low voltage direct current circuit breaker explosion chamber assembly structure, be in including explosion chamber and arrangement the static contact of explosion chamber downside, the explosion chamber includes:

the bracket is of an integrally formed structure and comprises a first side plate part and a second side plate part which are symmetrically arranged and a connecting plate part which is connected between the first side plate part and the second side plate part; the first side plate part, the second side plate part and the connecting plate part are jointly enclosed to form a U-shaped cavity, the opening of the U-shaped cavity is arranged in the lateral direction and is in a horn shape, the connecting plate part is provided with a movement channel penetrating through the U-shaped cavity along the thickness direction, a plurality of mounting grooves are symmetrically formed in the opposite sides of the first side plate part and the second side plate part, the mounting grooves are arranged in parallel at intervals, the openings of the mounting grooves extend to the outer ends of the side plate parts, and two containing cavities are symmetrically formed in the rear side of the connecting plate part by the vertical central line of the movement channel;

the arc extinguishing grid pieces are provided with a plurality of arc extinguishing grid pieces and are respectively inserted into the mounting grooves;

and the two permanent magnets are respectively arranged in the two accommodating cavities and are both N poles or both S poles.

As a further improvement, the bracket is made of high-temperature resistant nylon gas production material.

As a further improvement of the utility model, the mounting groove is obliquely arranged, and the lowest end is arranged in the inside of the U-shaped cavity.

As a further improvement of the utility model, the mounting groove is horizontally arranged.

As a further improvement, the bottom of the support is provided with a circular arc-shaped cavity, and the static contact is arranged in the circular arc-shaped cavity.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) A low-voltage direct-current circuit breaker arc extinguish chamber assembly structure is characterized in that a support is integrally formed by a die, the number of parts is small, the manufacturing cost is low, an opening of a U-shaped cavity chamber of the support is horn-shaped, electric arc can be favorably diffused to an arc extinguish grid piece, the arc extinguish efficiency is improved, a plurality of mounting grooves are symmetrically formed in opposite sides of a first side plate part and a second side plate part, the mounting grooves are arranged in parallel at intervals, openings of the mounting grooves extend to the outer ends of the side plate parts, the arc extinguish grid pieces can be conveniently inserted, the assembly efficiency is improved, and batch production is facilitated;

(2) The rear side of connecting plate portion is equipped with two with the vertical central line symmetry of motion passageway and holds the chamber, through holding the intracavity and arranging the permanent magnet for the permanent magnet contactless electric arc also does not receive high temperature air current to influence, can make the permanent magnet keep more permanent magnetic force, has improved the life-span of explosion chamber.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of an arc extinguish chamber assembly structure of a low-voltage dc circuit breaker according to the present invention;

fig. 2 is a half-section schematic view of an arc extinguish chamber assembly structure of the low-voltage direct-current circuit breaker of the utility model;

fig. 3 is a schematic structural diagram of a bracket in an assembly structure of an arc extinguish chamber of a low-voltage direct-current circuit breaker according to the present invention;

fig. 4 is a schematic structural diagram of fig. 3 from another view angle.

In the figure: 1. a support; 2. static contact; 3. arc extinguishing grid pieces; 4. a permanent magnet; 10. a U-shaped chamber; 11. a first side plate portion; 12. a second side plate portion; 13. a connecting plate portion; 100. mounting grooves; 130. a motion channel; 1000. a circular arc-shaped chamber; 1300. a receiving cavity.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

Please refer to fig. 1 to 4, which illustrate a specific embodiment of an arc extinguish chamber assembly structure of a low voltage dc circuit breaker according to the present invention.

Referring to fig. 1, a low-voltage direct current circuit breaker explosion chamber assembly structure, including the explosion chamber with arrange static contact 2 in the explosion chamber downside, the explosion chamber includes: the bracket 1 is of an integrally molded structure, is made of a high-temperature-resistant nylon gas production material, and comprises a first side plate part 11 and a second side plate part 12 which are symmetrically arranged, and a connecting plate part 13 which is connected between the first side plate part 11 and the second side plate part 12; the first side plate part 11, the second side plate part 12 and the connecting plate part 13 jointly enclose to form a U-shaped cavity 10, and the opening of the U-shaped cavity 10 is arranged in the lateral direction and is trumpet-shaped; the arc extinguishing grid piece 3 is processed by using a material with gas production performance, and the opening of the U-shaped cavity 10 is trumpet-shaped, so that the arc is favorably diffused to the arc extinguishing grid piece 3. The connecting plate portion 13 is provided with a moving channel 130 penetrating through the U-shaped cavity 10 along the thickness direction, the opposite sides of the first side plate portion 11 and the second side plate portion 12 are symmetrically provided with a plurality of mounting grooves 100, the mounting grooves 100 are arranged in parallel and at intervals, and the openings of the mounting grooves 100 extend to the outer ends of the side plate portions, as shown in fig. 3, the rear side of the connecting plate portion 13 is symmetrically provided with two accommodating cavities 1300 by the vertical central line of the moving channel 130; a plurality of arc extinguishing grids 3 inserted into the mounting grooves 100; the permanent magnets 4, which have two poles, are respectively disposed in the two accommodating cavities 1300, and are both N-poles or both S-poles.

Specifically, the stationary contact of the stationary contact 2 is located at the lowest part of the moving channel 130 and at the center of the moving channel 130, so that the arc is extruded instantly when being broken, and meanwhile, the arc releases hydrogen gas to cool the arc when eroding the bracket 1, so that the air pressure in the arc extinguishing chamber can be increased, and the arc is pushed to diffuse towards the arc extinguishing grid plate 3 rapidly along the direction of the horn.

Referring to fig. 2 and 4, it should be noted that the mounting groove 100 is disposed obliquely, and the lowest end is disposed inside the U-shaped chamber 10. Alternatively, the mounting groove 100 is horizontally disposed. During assembly, the arc extinguishing grid pieces 3 are directly inserted into the mounting groove 100 from the opening of the U-shaped cavity chamber 10 in the positive and negative directions, and the simple assembly method can improve the assembly efficiency and is beneficial to batch production of products. The rear side of connecting plate portion 13 is equipped with two with the vertical central line symmetry of motion passageway 130 and holds chamber 1300, through holding permanent magnet 4 arranging in chamber 1300 for permanent magnet 4 contactless electric arc also does not receive high temperature air current to influence, can make permanent magnet 4 keep more permanent magnetic force, has improved the life-span of explosion chamber.

Referring to fig. 2 and 4, the bottom of the bracket 1 is provided with an arc-shaped chamber 1000, and the static contact 2 is disposed in the arc-shaped chamber 1000.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a low pressure direct current circuit breaker explosion chamber assembly structure, includes the explosion chamber and arranges the static contact of explosion chamber downside, its characterized in that, the explosion chamber includes:

a plurality of arc extinguishing grid pieces which are respectively inserted into the mounting grooves;

and the two permanent magnets are respectively arranged in the two accommodating cavities and are the same N pole or the same S pole.

2. The arc extinguish chamber assembly structure of the low-voltage direct-current circuit breaker according to claim 1, wherein the bracket is made of a high-temperature-resistant nylon gas production material.

3. The arc chute assembly structure for low-voltage direct-current circuit breakers of claim 1, characterized in that said mounting groove is arranged obliquely and the lowest end is arranged inside said U-shaped chamber.

4. The arc chute assembly structure of a low-voltage direct current circuit breaker according to claim 1, characterized in that said mounting groove is arranged horizontally.

5. The arc extinguish chamber assembly structure of a low-voltage direct-current circuit breaker according to claim 1, wherein a circular arc-shaped chamber is formed in the bottom of the support, and the fixed contact is arranged in the circular arc-shaped chamber.