CN217719463U

CN217719463U - Magnetic blow-out arc extinguishing structure of direct current contactor

Info

Publication number: CN217719463U
Application number: CN202220908008.8U
Authority: CN
Inventors: 不公告发明人
Original assignee: Haosong Technology Suzhou Co ltd
Current assignee: Haosong Technology Suzhou Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-11-01
Anticipated expiration: 2032-04-19

Abstract

The utility model discloses a direct current contactor magnetic quenching structure, include: the arc extinguishing cover, a pair of fixed contacts fixed on the arc extinguishing cover and a moving contact arranged in the arc extinguishing cover in a vertically reciprocating mode, wherein two first permanent magnets are arranged on two sides of the two fixed contacts in the arc extinguishing cover, four second permanent magnets are arranged between the two fixed contacts in the arc extinguishing cover, the four second permanent magnets are symmetrically distributed on two sides of a moving path of the moving contact in pairs and are arranged opposite to the first permanent magnets, and arcs generated when the moving contact and the two fixed contacts are disconnected are guided to opposite directions under the action of magnetic fields generated by the first permanent magnets and the second permanent magnets. The utility model discloses direct current contactor magnetic blow-out arc extinguishing structure has improved the magnetic field intensity of contact position, makes magnetic blow-out arc extinguishing effect better, and the arc extinguishing performance under the long-time use of direct current contactor is more excellent, more durable use.

Description

Magnetic quenching structure of direct current contactor

Technical Field

The utility model relates to a direct current contactor technical field, in particular to direct current contactor magnetism blowout arc extinguishing structure.

Background

In the use of direct current contactor, can produce electric arc when moving contact and static contact are disconnected, if electric arc can not extinguish immediately, can cause the burnout contact very probably, cause the contactor to burn out the damage even.

At present, a pair of magnetic steels are installed in an arc extinguishing chamber of a direct current contactor, and an arc is subjected to the action of lorentz force by utilizing a magnetic field generated by the magnetic steels, so that the arc is guided into the arc extinguishing chamber to be extinguished. The big magnet steel of both sides installation at two static contacts is generally all to current direct current contactor's magnet steel mode of arranging, though this technical scheme can reach certain magnetism and blow out the arc extinguishing effect under the less condition of arc extinguishing cavity, magnet steel span, but in the product of high-pressure heavy current, arc extinguishing cavity volume increase, the magnet steel span is very long, adopts the magnetic field intensity of above-mentioned structure not enough, leads to magnetism to blow out the arc extinguishing effect not good. Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

The utility model aims to solve the problem that a direct current contactor magnetism blowout arc extinguishing structure is provided to overcome the defect that current direct current contactor magnet steel span is long, magnetic field intensity is not enough to lead to magnetism blowout arc extinguishing effect not good.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a magnetic quenching structure of a direct current contactor comprises: the arc extinguishing cover, a pair of fixed contacts fixed on the arc extinguishing cover and a moving contact arranged in the arc extinguishing cover in a vertically reciprocating mode, wherein two first permanent magnets are arranged on two sides of the two fixed contacts in the arc extinguishing cover, four second permanent magnets are arranged between the two fixed contacts in the arc extinguishing cover, the four second permanent magnets are symmetrically distributed on two sides of a moving path of the moving contact in pairs and are arranged opposite to the first permanent magnets, and arcs generated when the moving contact and the two fixed contacts are disconnected are guided to opposite directions under the action of magnetic fields generated by the first permanent magnets and the second permanent magnets.

As a further improvement of the utility model, the first permanent magnet is composed of at least two pieces of magnetic steel in a superposed attraction manner.

As a further improvement, be provided with in the arc-extinguishing chamber with first permanent magnet with a plurality of positioning slot that the second permanent magnet size matches, first permanent magnet with the second permanent magnet cartridge is corresponding in the positioning slot.

As a further improvement of the present invention, the magnetic pole directions of the first permanent magnet and the second permanent magnet are the same.

The beneficial effects of the utility model are that:

1. the utility model provides a direct current contactor magnetic quenching structure, through arranging the first permanent magnet in the both sides of two static contacts, arrange four second permanent magnets between two static contacts, and four second permanent magnets are close to the static contact as far as and arrange to this realizes producing higher magnetic field intensity at the static contact, makes the magnetic quenching effect better, avoids the magnetic field intensity that causes because the arc extinguishing cavity is too big, the magnet steel span overlength is not enough;

2. first permanent magnet adopts but not limited to two magnet steel attractions to be in the same place, has not only increased the magnetic field intensity of contact position, has further improved the magnetic blowout arc extinguishing effect, compares in the monoblock magnet steel that directly uses equal thickness simultaneously, and two magnet steel attractions are its ageing magnetic decay littleer together for the arc extinguishing performance under the long-time use of direct current contactor is more excellent, more durable use.

Drawings

Fig. 1 is a bottom view of the magnetic quenching structure of the dc contactor of the present invention;

figure 2 is a perspective view of the first permanent magnet and the second permanent magnet of the present invention installed in the arc extinguishing chamber;

fig. 3 is a schematic structural view of the magnetic quenching structure of the dc contactor according to the present invention, which is marked with magnetic field distribution and current flow direction;

in fig. 3, the direction indicated by the arrow is the arc deflection direction.

The following description is made with reference to the accompanying drawings:

1. an arc extinguishing chamber; 101. positioning the slot; 2. static contact; 3. a moving contact; 4. a first permanent magnet; 5. a second permanent magnet.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

Referring to fig. 1 to 2, the utility model provides a dc contactor magnetic quenching structure, include: the arc extinguishing chamber has in the arc extinguishing chamber 1, two static contacts 2 symmetry are fixed at the top of arc extinguishing chamber 1 and its lower extreme all stretches into the arc extinguishing chamber, but moving contact 3 up-and-down reciprocating's setting is in the arc extinguishing chamber and is located two static contacts 2 under.

Two first permanent magnets 4 are arranged on two sides of the two fixed contacts 2 in the arc-extinguishing cover 1 along the vertical direction, the two first permanent magnets 4 are arranged in parallel and oppositely, and meanwhile, the centers of the two first permanent magnets 4 and the centers of the two fixed contacts 2 are positioned on the same straight line. Four second permanent magnets 5 are further installed between the two fixed contacts 2 in the arc-extinguishing chamber 1, the four second permanent magnets 5 are symmetrically distributed on the front side and the rear side of the moving path of the moving contact 3 in a pairwise manner along the vertical direction, and the four second permanent magnets 5 are parallel and arranged relative to the first permanent magnet 4.

Referring to fig. 1, the two second permanent magnets 5 on the left side are arranged close to the fixed contact 2 on the left side, and the two second permanent magnets 5 on the right side are arranged close to the fixed contact 2 on the right side. The magnetic pole directions of the two first permanent magnets 4 and the four second permanent magnets 5 are the same, and electric arcs generated when the moving contact 3 and the two fixed contacts 2 are disconnected are led to the arc extinguishing chamber in the opposite direction to be extinguished under the action of magnetic fields generated by the first permanent magnets 4 and the second permanent magnets 5. This application is through adopting this structure to four second permanent magnets 5 are close to as far as and arrange in static contact 2, use with the cooperation of two second permanent magnets 5, produce higher magnetic field intensity in static contact 2 department, make magnetism blow-out arc extinguishing effect better, fine solution high voltage heavy current product because of the too big, span overlength problem that the magnetic field intensity that causes of arc extinguishing cavity is not enough.

In this embodiment, the first permanent magnet 4 and the second permanent magnet 5 are both magnetic steels, and the first permanent magnet 4 is used as a main magnetic steel, and the size of the main magnetic steel is larger than that of the second permanent magnet 5; the second permanent magnet 5 adopts small magnetic steel to realize the effect of enhancing the magnetic field intensity.

Further, the first permanent magnet 4 is formed by superposing and attracting at least two pieces of magnetic steel. First permanent magnet 4 adopts but not limited to two magnet steel attractions to be in the same place in this embodiment, has not only increased the magnetic field intensity of contact position, has further improved the magnetic blowout arc extinguishing effect, compares in the monoblock magnet steel that directly uses equal thickness simultaneously, and two magnet steel attractions are together its ageing magnetic decay littleer for the arc extinguishing performance under the long-time use of direct current contactor is more excellent, and more durable use improves direct current contactor's life.

Referring to fig. 2, a plurality of positioning slots 101 matched with the first permanent magnet 4 and the second permanent magnet 5 in size are arranged in the arc-extinguishing chamber 1, the first permanent magnet 4 and the second permanent magnet 5 are inserted into the corresponding positioning slots 101 from bottom to top, and an insulating plate (not shown in the figure) arranged at the bottom of the arc-extinguishing chamber 1 is matched to position the first permanent magnet 4 and the second permanent magnet 5, so that the assembly is easy, and the structure is stable and firm.

A preferred embodiment is described in detail with reference to fig. 3. The left ends of the first permanent magnet 4 and the second permanent magnet 5 are both S poles, and the right ends thereof are both N poles, so that the directions of the magnetic fields formed on the static contacts 2 are from left to right, and when current flows in from the static contact 2 on the right side and flows out from the static contact 2 on the left side, the current is judged according to the left-hand rule: the arc generated on the left static contact 2 is subjected to an upward Lorentz force, and the arc deflects upwards; the arcs generated on the right static contact 2 are subjected to the downward lorentz force, and the arcs deflect downwards, so that the arcs generated on the two static contacts 2 are directed to the arc extinguishing chamber in the opposite direction to be extinguished.

Similarly, when the current flows in from the left static contact 2 and flows out from the right static contact 2, the arc deflection direction is opposite to the above, and the same effect can be achieved.

Of course, the right ends of the first permanent magnet 4 and the second permanent magnet 5 may be both S poles, and the left ends thereof may be both N poles, and the magnetic quenching effect may also be obtained in the same way, which is not described in detail herein.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms and is therefore not limited to the specific embodiments disclosed above. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a direct current contactor magnetism blowout arc extinguishing structure, includes arc-extinguishing chamber (1), fixes a pair of static contact (2) and up-and-down motion setting on arc-extinguishing chamber (1) are in moving contact (3) in arc-extinguishing chamber (1), be located two in arc-extinguishing chamber (1) two first permanent magnet (4), its characterized in that are installed to the both sides of static contact (2): four second permanent magnets (5) are arranged between the two fixed contacts (2) in the arc extinguishing cover (1), the four second permanent magnets (5) are symmetrically distributed on two sides of a moving path of the moving contact (3) in pairs and are arranged opposite to the first permanent magnet (4), and electric arcs generated when the moving contact (3) and the two fixed contacts (2) are disconnected are led to opposite directions under the action of magnetic fields generated by the first permanent magnet (4) and the second permanent magnets (5).

2. The magnetic quenching structure of the DC contactor according to claim 1, wherein: the first permanent magnet (4) is formed by superposing and attracting at least two pieces of magnetic steel.

3. The magnetic quenching structure of the DC contactor according to claim 1, wherein: a plurality of positioning slots (101) matched with the first permanent magnet (4) and the second permanent magnet (5) in size are arranged in the arc extinguishing chamber (1), and the first permanent magnet (4) and the second permanent magnet (5) are inserted into the corresponding positioning slots (101).

4. The magnetic quenching structure of the DC contactor according to claim 1, wherein: the magnetic pole directions of the first permanent magnet (4) and the second permanent magnet (5) are the same.