CN217158090U

CN217158090U - Direct current breaker static contact device with non-polarity magnetic blow

Info

Publication number: CN217158090U
Application number: CN202220939784.4U
Authority: CN
Inventors: 刘丰丰; 侯魁; 杜吟; 王�忠; 李涛; 韩云; 吴晓杭; 葛飞; 戴罡
Original assignee: Jiangsu Daquan Kaifan Switch Co ltd
Current assignee: Jiangsu Daquan Kaifan Switch Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-08-09
Anticipated expiration: 2032-04-22

Abstract

A direct current breaker static contact device with non-polar magnetic blow changes the traditional scheme of installing a permanent magnet, an insulating seat is installed in a cavity in the middle of the static contact, an arc contact is installed in the insulating seat, an arc striking plate is riveted in a clamping groove of the arc contact, the arc contact and the static contact are fixed by a screw and an insulating sleeve, the static contact and the arc contact are mutually insulated, a coil is symmetrically installed at two ends of the static contact, and finally the static contact device and a rear bottom plate are reliably fixed by the screw. The device stable performance is reliable, and simple structure fault rate is low, has prolonged life.

Description

Direct current breaker static contact device with non-polarity magnetic blow

Technical Field

The utility model belongs to the technical field of low voltage apparatus components and parts equipment and specifically relates to a direct current circuit breaker static contact device with nonpolarity magnetism blows is related to.

Background

The dc universal circuit breaker plays a major role in the distribution line to make and break the circuit under normal and abnormal (overload or short circuit) conditions. When a short-circuit fault occurs to a line, the contacts of the circuit breaker should act quickly to break the main circuit so as to prevent the equipment from being damaged. As is well known in the art, the circuit breaker generates an arc when a moving contact is opened under a current-carrying condition, and the arc extinguishing of direct current is more difficult than that of alternating current because a direct current power supply is different from an alternating current power supply and does not have a natural zero crossing point. Especially at low rated currents, the lack of electrodynamic forces results in a slow rate of rise of the arc to the arc chute, or the arc continues to burn between the contacts without rising. The light condition causes burning loss of the contact of the product and reduces the electrical service life; the serious product burns out to cause fire accidents.

In order to solve the above problems, for example, chinese patent publication No. CN209766345U discloses an arc extinguishing system of a dc circuit breaker, which includes a fixed contact, an arc extinguishing cover disposed on the fixed contact, and a movable contact linked with an operating mechanism and rotating relative to the fixed contact, wherein at least one strip-shaped permanent magnet is disposed on the arc extinguishing cover corresponding to the fixed contact, the strip-shaped permanent magnet is transversely disposed on the arc extinguishing cover, and a magnetic induction line of the strip-shaped permanent magnet is perpendicular to a plane formed by a trajectory of performing switching on and off operations of the movable contact. The utility model has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, high breaking capacity and long service life.

Also, for example, chinese patent publication No. CN212695109U discloses an arc extinguishing system of a dc circuit breaker, including an arc extinguishing chamber disposed at one side of a contact mechanism of the circuit breaker, wherein two first magnetic conductive plates are disposed at one side of the arc extinguishing chamber, an arc striking chamber is formed between the two first magnetic conductive plates, a moving contact and a static contact of the contact mechanism are switched on and off in the arc striking chamber, the static contact is disposed at one side of the arc striking chamber and fixed above the arc extinguishing chamber, an arc striking angle is disposed at the other side of the arc striking chamber, the arc striking angle is disposed below the moving contact, and an interval between at least a portion of one side of the two first magnetic conductive plates close to the arc extinguishing chamber is smaller than an interval between one sides of the two first magnetic conductive plates far from the arc extinguishing chamber. The utility model discloses an arc extinguishing system of direct current circuit breaker, two first magnetic conduction boards are close to the interval of at least part of explosion chamber one side and are less than the interval of keeping away from explosion chamber one side, have strengthened the magnetic field intensity in striking chamber, make electric arc can follow the striking angle fast and get into extinguishing in the explosion chamber, thereby reduce electric arc dead time on the stationary contact and alleviate the static contact degree of scaling loss, and the cost is lower.

At present, the above patents have certain disadvantages in the actual operation process: in the two prior arts, the magnetic field intensity between the moving contact and the fixed contact is enhanced, so that the electric arc enters the arc extinguish chamber to extinguish in a low current state. However, the scheme has the following disadvantages: 1. the magnetism of the permanent magnet can be weakened in a strong electromagnetic environment for a long time, and the small current breaking capacity is influenced. 2. The permanent magnet has N/S polarity, the polarity installation and the current direction between the moving contact and the static contact are required to be kept consistent, the installation pairing is troublesome, and the rising of the electric arc can be suppressed once the installation is wrong, so that the method is suitable for the contrary. The prior art remains to be improved.

Summary of the invention

The utility model provides a direct current circuit breaker static contact device with nonpolarity magnetism blows to solve above-mentioned problem.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a static contact device of a direct current circuit breaker with non-polar magnetic blow comprises a static contact, an insulating base, an arc contact, a coil, an arc striking sheet, a rear bottom plate and a coil cover. One end of the fixed contact is connected with the insulating base, the other end of the fixed contact is connected with the rear base plate, the arc contact is located on the other side of the insulating base and connected with the insulating base, one end of the arc striking piece is connected with the arc contact, the other end of the arc striking piece is connected with the rear base plate, one end of the coil is connected with the arc contact, the other end of the coil is connected with the fixed contact, and the coil cover is located above the coil.

Furthermore, a cavity is designed in the middle of the static contact, and an insulating seat is installed in the cavity.

Furthermore, two ends of the static contact are fixed on the rear base plate through screws.

Further, an arc contact is installed in the insulating seat.

Furthermore, the arc contact is provided with a clamping groove, and the arc striking piece is inserted into the arc contact groove and riveted.

Further, the arc contact and the static contact are fixed in a mode of screws and insulating sleeves.

Furthermore, the coil includes left coil and right coil, and left and right coil is the symmetrical design.

Furthermore, one end of the coil is fixed on the arc contact through a screw.

Further, the other end of the coil is fixed on the static contact through a screw.

Further, a coil cover is designed above the coil.

Compared with the prior art, the utility model discloses the beneficial effect of device lies in: a direct current breaker static contact device with non-polar magnetic blow changes the traditional scheme of installing a permanent magnet, an insulating seat is installed in a cavity in the middle of the static contact, an arc contact is installed in the insulating seat, an arc striking plate is riveted in a clamping groove of the arc contact, the arc contact and the static contact are fixed by a screw and an insulating sleeve, the static contact and the arc contact are mutually insulated, a coil is symmetrically installed at two ends of the static contact, and finally the static contact device and a rear bottom plate are reliably fixed by the screw. The device stable performance is reliable, and simple structure fault rate is low, has prolonged life.

Drawings

Fig. 1 is an assembly schematic diagram of a static contact device of a dc circuit breaker with non-polar magnetic blow-out of the present invention;

fig. 2 is a simplified structural diagram of a fixed contact of a dc circuit breaker with non-polar magnetic blow-out of the present invention;

fig. 3 is a front view of a fixed contact of a dc circuit breaker with non-polar magnetic blow-out of the present invention;

fig. 4 is a cross-sectional view of a fixed contact of a dc circuit breaker with non-polar magnetic blow-out of the present invention;

fig. 5 is a structural diagram of a static contact and a moving contact of the dc circuit breaker with non-polar magnetic blow-out of the present invention;

fig. 6 is a schematic diagram of the working principle of the fixed contact and the moving contact of the dc circuit breaker with non-polar magnetic blow.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The utility model provides a technical scheme: a static contact device of a direct current circuit breaker with non-polar magnetic blow comprises a static contact 1, an insulating base 2, an arc contact 3, a coil 4, an arc striking plate 5, a rear bottom plate 6 and a coil cover 7. The processing process flow is as follows:

installing an arc striking sheet 5: the arc striking sheet 5 is provided with a groove, the groove and the arc contact 3 are provided with prefabricated holes, the arc striking sheet 5 is inserted into the groove of the arc contact 3, a rivet penetrates through the prefabricated holes of the arc striking sheet 5 and the arc contact 3, and the arc striking sheet 5 and the arc contact 3 are riveted.

Installing a static contact 1, an insulating seat 2 and an arc contact 3: the insulating base 2 is installed in the cavity of the static contact 1, the arc contact 3 is installed in the insulating base 2, the arc contact 3 and the static contact 1 are fixed in a mode of screws and insulating sleeves, and the arc contact 3 and the static contact 1 are separated by the insulating base 2, so that the static contact 1 and the arc contact 3 are mutually insulated, as shown in fig. 4.

Installing the coil 4: the coil 4 includes a left coil and a right coil, which are symmetrically distributed, one end of the coil 4 is fixed on the arc contact 3 through a screw, and the other end is fixed on the static contact 1 through a screw, as shown in fig. 3.

And (3) integral assembly: the static contact 1 is fixed on the rear bottom plate 6 through a screw, the screw passes through a hole above the arc striking plate 5 and is fixed on the rear bottom plate 6, the coil cover 7 is clamped above the coil 4,

the utility model relates to a direct current circuit breaker static contact device with nonpolarity magnetism blows constitutes a direct current circuit breaker with zero parts such as operating device, moving contact 8 with nonpolarity magnetism blows, as shown in fig. 5, when moving contact 8 opens the branch and divides the undercurrent, electric current I gets into static contact 1 from the upper end, then flows coil 4 and reachs arc contact 3, reachs moving contact 8 through the electric arc between arc contact 3 and the moving contact 8. When the circuit I flows through the coil, an inward magnetic field B is generated, the electric arc receives a vertical upward acting force F in the magnetic field, and the electric arc rapidly enters an upper arc extinguishing chamber area to be extinguished under the action of the acting force F, as shown in fig. 6. When the direction of the current I is reversed, the current flowing through the coil of the circuit I is reversed to generate an outward magnetic field B, the direction of the acting force F of the magnetic field applied to the electric arc is still vertical and upward, and the electric arc rapidly enters the arc extinguishing chamber area above the electric arc to extinguish the electric arc under the action of the acting force F without being influenced by the direction of the current.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a direct current circuit breaker static contact device with nonpolarity magnetism blows which characterized in that: the novel contact structure comprises a static contact (1), an insulating base (2), an arc contact (3), a coil (4), an arc striking piece (5), a rear base plate (6) and a coil cover (7), wherein one end of the static contact (1) is connected with the insulating base (2), the other end of the static contact is connected with the rear base plate (6), the arc contact (3) is located on the other side of the insulating base (2) and is connected with the insulating base (2), one end of the arc striking piece (5) is connected with the arc contact (3), the other end of the arc striking piece is connected with the rear base plate (6), one end of the coil (4) is connected with the arc contact (3), the other end of the coil is connected with the static contact (1), and the coil cover (7) is located above the coil (4).

2. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 1, wherein: a cavity is designed in the middle of the static contact (1), and an insulating seat (2) is installed in the cavity.

3. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 2, wherein: and two ends of the static contact (1) are fixed on the rear bottom plate (6) through screws.

4. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 2, wherein: and an arc contact (3) is arranged in the insulating seat (2).

5. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 4, wherein: the arc contact (3) is provided with a clamping groove, and the arc striking piece (5) is inserted into the clamping groove of the arc contact (3) and riveted.

6. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 5, wherein: the arc contact (3) and the static contact (1) are fixed in a mode of screws and insulating sleeves.

7. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 1, wherein: the coil (4) comprises a left coil and a right coil which are symmetrically designed.

8. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 7, wherein: one end of the coil (4) is fixed on the arc contact (3) through a screw.

9. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 8, wherein: the other end of the coil (4) is fixed on the static contact (1) through a screw.

10. The static contact device of the direct current circuit breaker with the non-polar magnetic blow as claimed in claim 9, wherein: a coil cover (7) is designed above the coil (4).