CN217588835U

CN217588835U - Direct current circuit breaker with air blowing function

Info

Publication number: CN217588835U
Application number: CN202221460432.7U
Authority: CN
Inventors: 刘世奇; 刘伟; 权磊; 孙晓丁; 周静; 武艳艳; 孙艺阁; 易川; 张鹏
Original assignee: China XD Electric Co Ltd; Xian XD High Voltage Apparatus Co Ltd
Current assignee: China XD Electric Co Ltd; Xian XD High Voltage Apparatus Co Ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-10-14
Anticipated expiration: 2032-06-10

Abstract

The utility model relates to a direct current breaker field especially relates to a direct current breaker with air-blowing function, including mounting bracket, operating mechanism, static contact, moving contact, explosion chamber, delay arc device and air-blowing device, the drive end of operating mechanism contacts with the moving contact, the fixed end of moving contact is articulated with the mounting bracket; an arc extinguishing grid is arranged in the arc extinguishing chamber; the arc extending device is arranged at an inlet of the arc extinguish chamber and is connected with the fixed contact; the air blowing device comprises a cylinder, a piston pull rod and a driving piece, the cylinder is connected with the inner wall of the shell, the piston is connected inside the cylinder in a sliding mode, one end of the piston pull rod is connected with the piston, and an outlet of the cylinder faces an inlet of the arc extinguish chamber. The utility model discloses utilize the air-blast principle, increase the kinetic energy of electric arc to the propelling movement in the arc extinguish chamber, electric arc extension device's effect under the reinforcing heavy current condition can be solved again electric arc extension device and can't carry out the problem of cutting off in with undercurrent propelling movement to the arc extinguish chamber.

Description

Direct current circuit breaker with air blowing function

Technical Field

The utility model relates to a direct current breaker field specifically is a direct current breaker with air-blowing function.

Background

The topological structure of the current breaker is complex and various, the design scheme is various, and the design scheme of the direct current breaker can be divided into three types according to the difference of key on-off devices in the direct current breaker: air-based dc circuit breakers, solid-state dc circuit breakers and hybrid dc circuit breakers.

The air type direct current circuit breaker has the advantages of large on-off current, low cost, small on-state loss, simple structure, low requirement on control links, high reliability, wide engineering application on a direct current change-over switch in an end-to-end high-voltage direct current transmission system and mature technology.

The solid-state direct current circuit breaker has the advantages of strong breaking capacity, extremely high switching speed, easy realization of accurate and intelligent control, simple breaking principle, no electric arc generation during the operation of the switch, high on-state loss, complex structure and control and high manufacturing cost. Because the voltage and current levels of a single power electronic switch are low, a large number of power electronic devices need to be connected in series when the switch is applied to a high-voltage high-capacity direct-current system, and the problems of voltage sharing, current sharing, cooling and the like are caused.

The hybrid direct current circuit breaker has the advantages that the hybrid direct current circuit breaker combines the good static characteristic of a mechanical switch and the good dynamic performance of a power electronic switch, has the advantages of short switching-off time, compact structure and the like, and has the defect that the power electronic switch needs to be connected in series in a main branch circuit, and the problem of high on-state loss exists.

At present, in the low-current switching-on and switching-off process of an air type direct current circuit breaker, the energy of electric arcs generated by low current is low, and the electric arcs cannot be pushed to a metal grid sheet type air arc extinguish chamber, so that the electric arcs are retained between a moving contact and a static contact, cannot be extinguished, and cannot cut off a primary circuit. The small current cut-off device is required to be additionally arranged on the small current cut-off device, electromagnetic fields are constructed on two sides of the electric arc extension device by the small current cut-off device, the generated electric power pushes the electric arc into the metal grid sheet type air arc extinguishing chamber, and then the electric arc generated by the small current is extinguished.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a direct current circuit breaker with air-blowing function.

The utility model discloses a realize through following technical scheme:

a direct current breaker with an air blowing function comprises an installation frame, an operating mechanism, a fixed contact, a movable contact, an arc extinguish chamber, an arc extending device and an air blowing device, wherein the operating mechanism is fixedly connected to the installation frame; the arc extinguishing chamber is communicated with the outside, and an arc extinguishing grid is arranged in the arc extinguishing chamber; the arc extending device is arranged at an inlet of the arc extinguish chamber and is connected with the fixed contact; the air blowing device comprises a cylinder, a piston pull rod and a driving piece, the cylinder is connected with the inner wall of the shell, the piston is connected inside the cylinder in a sliding mode, one end of the piston pull rod is connected with the piston, the other end of the piston pull rod extends out of the cylinder to be connected with the driving piece, and an outlet of the cylinder faces an inlet of the arc extinguish chamber.

Preferably, a nozzle is arranged at the outlet of the cylinder.

Preferably, the arc-extinguishing grid comprises a plurality of metal grids and a plurality of insulating grids, and the metal grids and the insulating grids are alternately arranged.

Preferably, a mechanism connecting rod is arranged between the operating mechanism and the moving contact, one end of the mechanism connecting rod is connected with the driving end of the operating mechanism, and the other end of the mechanism connecting rod is in contact with the moving contact.

Preferably, the mechanism connecting rod is used as a driving piece of the air blowing device, and one end of the piston pull rod, which extends out of the cylinder, is connected with the moving contact.

Preferably, an insulating part is further arranged on the mechanism connecting rod.

Preferably, the arc extending device comprises a first arc extending piece and a second arc extending piece which are arranged on two sides of an inlet of the arc extinguish chamber, and the static contact is arranged at the lower end part of the second arc extending piece; when the switch is opened, the moving contact is positioned at the lower end part of the first arc extending piece.

Preferably, the mounting frame comprises a mounting platform, a first insulating support plate, a second insulating support plate and a top support plate, the first insulating support plate and the second insulating support plate are arranged on the mounting platform in a relatively parallel manner, the operating mechanism is connected with the first insulating support plate, and the fixed end of the moving contact is hinged to the second insulating support plate; the first insulating support plate and the second insulating support plate are both connected with the top support plate, the arc extinguish chamber is arranged above the top support plate, and an opening consistent with an inlet of the arc extinguish chamber is formed in the top support plate; the arc extending device is connected with the top supporting plate and arranged at the opening.

Preferably, the device further comprises a flow guide element, wherein the flow guide element comprises a first flow guide row and a second flow guide row, the first flow guide row is connected with the fixed contact, and the moving contact is connected with the second flow guide row.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model relates to a direct current circuit breaker with air-blowing function blows to the explosion chamber entry through setting up the air-blowing device, and the heat between the sound contact is taken away under the air current effect, gives simultaneously and provides kinetic energy to the ascending electric arc of explosion chamber, with electric energy propelling movement to in the explosion chamber to make this direct current circuit breaker can adopt the mode that improves arc voltage and be higher than return voltage, force arc voltage can't maintain, and then the mode of extinguishing electric arc cuts off direct current electric arc.

Furthermore, the nozzle can converge the airflow to ensure the sufficiency of the airflow.

Furthermore, the arc extinguishing chamber space that grid pieces made of insulating materials and grid pieces made of metal materials are arranged in an alternating mode divides elongated electric arc into electric arcs in small sections, the arc resistance of each small section is increased, the arc voltage is increased, and finally after the system voltage cannot maintain the electric arc voltage, the electric arc extinguishes and the current is cut off.

Furthermore, the piston pull rod is connected with the moving contact, so that the linkage of the operating mechanism and the piston pull rod can be realized.

Furthermore, the insulating part is used for ensuring the normal operation of the moving contact and playing a role in protection.

Drawings

Fig. 1 is a switching schematic diagram of a dc circuit breaker with an air blowing function according to the present invention;

fig. 2 is the utility model relates to a dc circuit breaker's separating brake schematic diagram with air-blowing function.

In the figure, 1, a platform is installed; 2. a first insulating support plate; 3. an operating mechanism; 4. a mechanism link; 5. an insulating member; 6. a first arc extending member; 7. an arc extinguishing grid; 8. a second arc extending member; 9. static contact; 10. a moving contact; 11. a first guide row; 12. a nozzle; 13. a piston rod; 14. a piston; 15. a cylinder; 16. a second guide row; 17. a second insulating support plate; 18. an arc extinguishing chamber; 19. a top support plate.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

The utility model discloses a direct current circuit breaker with air-blowing function, refer to fig. 1, 2, which comprises a mounting bracket, operating mechanism 3, static contact 9, moving contact 10, explosion chamber 18, prolong the arc device, air-blowing device and water conservancy diversion spare, the mounting bracket includes mounting platform 1, first insulation backup pad 2, second insulation backup pad 17 and top support plate 19, first insulation backup pad 2 and second insulation backup pad 17 are parallel arrangement relatively on mounting platform 1, operating mechanism 3 is connected through the bolt with first insulation backup pad 2, be equipped with mechanism connecting rod 4 between operating mechanism 3 and the moving contact 10, the one end of mechanism connecting rod 4 is connected with operating mechanism 3's drive end, the other end and moving contact 10 contact, the stiff end and the second insulation backup pad 17 of moving contact 10 are articulated.

The mechanism link 4 is also provided with an insulator 5.

The first insulating support plate 2 and the second insulating support plate 17 are both bolted to the top support plate. Arc extinguishing chamber 18 sets up in top supporting plate 19 top, and top supporting plate 19 is last to be seted up and to have the opening unanimous with arc extinguishing chamber 18 entry.

The arc extinguishing chamber 18 is communicated with the outside, and the arc extinguishing grid 7 is arranged in the arc extinguishing chamber 18. The arc chute 7 includes a plurality of metal grates and a plurality of insulating grates, which are alternately arranged.

The arc extending device is connected with the top support plate 19 and arranged at the opening. Prolong the arc device and extend arc 8 including setting up first arc piece 6 and the second of extending in explosion chamber 18 entry both sides, prolong the arc piece and include horizontal segment and slope section, and the horizontal segment is connected bottom 19 top support plates, and two slope sections form the electric arc entry, and electric arc entry and 18 entry coincidences of explosion chamber, and the electric arc entry is the back taper. The fixed contact 9 is arranged at the lower end part of the second arc extending piece 8; when the switch is opened, the movable contact 10 is positioned at the lower end part of the first arc extending piece 6.

The air blowing device comprises an air cylinder 15, a piston 14, a piston pull rod 13 and a driving piece, wherein the air cylinder 15 is connected with the inner wall of the shell, the piston 14 is connected inside the air cylinder 15 in a sliding mode, the mechanism connecting rod 4 serves as the driving piece of the air blowing device, one end of the piston pull rod 13 is connected with the piston 14, the other end of the piston pull rod extends out of the air cylinder 15 to be connected with the movable contact 10, an outlet of the air cylinder 15 faces an inlet of the arc extinguish chamber 18, and an outlet of the air cylinder 15 is provided with a nozzle 12.

The flow guide element comprises a first flow guide row 11 and a second flow guide row 16, the first flow guide row 11 is connected with the static contact 9, and the movable contact 10 is connected with the second flow guide row 16. The guide piece is used for leading out the outer end, so that the connection is convenient.

The utility model relates to a direct current breaker's implementation principle with air-blowing function does:

during closing, referring to fig. 1, the operating mechanism 3 drives the mechanism connecting rod 4 to move rightward, the mechanism connecting rod 4 simultaneously pushes the moving contact 10 and the piston pull rod 13 rightward through the insulating member 5, and the moving contact 10 is pressed on the second arc extending member 8 where the static contact 9 is located, so that closing is completed.

During opening, referring to fig. 2, the operating mechanism 3 drives the mechanism connecting rod 4 to move leftward, the mechanism connecting rod 4 pulls the movable contact 10 and the piston rod 13 leftward simultaneously through the insulating member 5, the movable contact 10 is separated from the second arc extending member 8 where the fixed contact 9 is located, an electric arc is generated between the movable contact 10 and the second arc extending member 8, meanwhile, the space in the air cylinder 15 moves leftward along with the piston rod 13, the space in the air cylinder 15 is squeezed, air pressure is increased, pressurized air is ejected from the air nozzle in the direction of the electric arc at high speed, the electric arc and generated energy are pushed upward and toward the gap between the arc-extinguishing grilles 7 regardless of the energy of the electric arc. The effect of extending the arc device has been strengthened promptly like this, has solved again in the lower condition of electric arc energy, and it can't push electric arc to the problem in the arc extinguishing grille 7 to extend the arc device.

The utility model relates to a direct current breaker with air-blowing function sets up nozzle 12 structure, utilizes operating mechanism 3 to provide kinetic energy, utilizes the air-blowing principle, increases the kinetic energy of propelling movement in electric arc to explosion chamber 18, and electric arc extends the effect of device under the reinforcing heavy current condition, can solve electric arc again and extend the device can't carry out the problem of cutting off in with undercurrent propelling movement to explosion chamber 18. The structure is mechanical, no secondary control element is needed to be added, a secondary control loop is simplified, the problem of difficulty in small cutoff of the air circuit breaker is solved, and the reliability of the air circuit breaker is improved.

The above-mentioned embodiments are only preferred embodiments of the present invention, and it should be understood by those skilled in the art that the technical solution of the present invention can be modified and replaced easily without departing from the spirit and principle of the present invention, and the modified and replaced embodiments also fall within the protection scope of the appended claims.

Claims

1. A direct current breaker with an air blowing function is characterized by comprising an installation frame, an operating mechanism (3), a static contact (9), a moving contact (10), an arc extinguish chamber (18), an arc delay device and an air blowing device, wherein the operating mechanism (3) is fixedly connected to the installation frame, a driving end of the operating mechanism (3) is in contact with the moving contact (10), and a fixed end of the moving contact (10) is hinged with the installation frame; the arc extinguishing chamber (18) is communicated with the outside, and an arc extinguishing grid (7) is arranged in the arc extinguishing chamber (18); the arc extending device is arranged at an inlet of the arc extinguish chamber (18) and is connected with the static contact (9); the air blowing device comprises a cylinder (15), a piston (14), a piston pull rod (13) and a driving piece, wherein the cylinder (15) is connected with the inner wall of the shell, the piston (14) is connected inside the cylinder (15) in a sliding mode, one end of the piston pull rod (13) is connected with the piston (14), the other end of the piston pull rod stretches out of the cylinder (15) to be connected with the driving piece, and an outlet of the cylinder (15) enters an inlet towards an arc extinguish chamber (18).

2. The direct current circuit breaker with blowing function according to claim 1, characterized in that a nozzle (12) is provided at the outlet of said cylinder (15).

3. The direct current circuit breaker with blowing function according to claim 1, characterized in that said arc-extinguishing grid (7) comprises a plurality of metal grids and a plurality of insulating grids, said metal grids and insulating grids being arranged alternately.

4. The dc circuit breaker with blowing function according to claim 1, wherein a mechanism link (4) is disposed between the operating mechanism (3) and the moving contact (10), one end of the mechanism link (4) is connected to the driving end of the operating mechanism (3), and the other end of the mechanism link is in contact with the moving contact (10).

5. The direct current circuit breaker with blowing function according to claim 4, characterized in that said mechanism link (4) is used as a driving member of the blowing device, and one end of said piston rod (13) extending out of the cylinder (15) is connected with the movable contact (10).

6. The dc circuit breaker with puffer function according to claim 4, wherein the mechanism link (4) is further provided with an insulator (5).

7. The direct current circuit breaker with blowing function according to claim 1, wherein said arc extension device comprises a first arc extension piece (6) and a second arc extension piece (8) disposed at two sides of the inlet of the arc extinguish chamber (18), said stationary contact (9) is disposed at the lower end of the second arc extension piece (8); when the brake is opened, the moving contact (10) is positioned at the lower end part of the first arc extending piece (6).

8. The dc circuit breaker with blowing function according to claim 1, wherein the mounting bracket comprises a mounting platform (1), a first insulating support plate (2), a second insulating support plate (17) and a top support plate (19), the first insulating support plate (2) and the second insulating support plate (17) are arranged on the mounting platform (1) in parallel, the operating mechanism (3) is connected with the first insulating support plate (2), and the fixed end of the movable contact (10) is hinged with the second insulating support plate (17); the first insulating support plate (2) and the second insulating support plate (17) are connected with a top support plate (19), the arc extinguish chamber (18) is arranged above the top support plate (19), and an opening consistent with an inlet of the arc extinguish chamber (18) is formed in the top support plate (19); the arc extending device is connected with the top supporting plate (19) and arranged at the opening.

9. The dc circuit breaker with air blowing function according to claim 1, further comprising a current guiding element, wherein the current guiding element comprises a first current guiding row (11) and a second current guiding row (16), the first current guiding row (11) is connected to the fixed contact (9), and the movable contact (10) is connected to the second current guiding row (16).