阅读说明：本技术 一种高压直流接触器 (High-voltage direct-current contactor ) 是由 赵鑫 苌群峰 冯萃峰 田亚伟 张楚贤 郑国龙 于 2020-03-17 设计创作，主要内容包括：本发明公开了一种高压直流接触器,包括：壳体、以及设置在壳体内的两个静触头、动触头、衔铁、轭铁、复位线圈、弹簧、磁力驱动杆、灭弧室和磁力驱动机构；灭弧室位于壳体内腔上方,磁力驱动机构位于壳体内腔底部；两个静触头对称设置在灭弧室内腔两侧；磁力驱动杆竖直设置在壳体的中线位置处；其中,磁力驱动杆伸入灭弧室的一端与磁性动触头连接,另一端穿过轭铁后、通过衔铁与磁力驱动机构连接；复位线圈设置在轭铁与衔铁之间、位于磁力驱动机构的两侧；弹簧缠绕在磁力驱动杆上。本发明克服了现有高压直流接触器灭弧系统设计磁场分布导致的电弧方向偏离度低、偏置方向集中的问题,减少了电弧对接触器触头的烧蚀,延长了高压直流接触器的使用寿命。(The invention discloses a high voltage direct current contactor, comprising: the device comprises a shell, two static contacts, a moving contact, an armature, a yoke, a reset coil, a spring, a magnetic driving rod, an arc extinguish chamber and a magnetic driving mechanism, wherein the two static contacts, the moving contact, the armature, the yoke, the reset coil, the spring, the magnetic driving rod, the arc extinguish chamber and the magnetic driving mechanism are arranged in; the arc extinguish chamber is positioned above the inner cavity of the shell, and the magnetic driving mechanism is positioned at the bottom of the inner cavity of the shell; the two static contacts are symmetrically arranged on two sides of the inner cavity of the arc extinguish chamber; the magnetic driving rod is vertically arranged at the center line position of the shell; one end of the magnetic driving rod extending into the arc extinguish chamber is connected with the magnetic moving contact, and the other end of the magnetic driving rod penetrates through the yoke and is connected with the magnetic driving mechanism through the armature; the reset coil is arranged between the yoke iron and the armature iron and positioned at two sides of the magnetic driving mechanism; the spring is wound on the magnetic driving rod. The invention overcomes the problems of low deviation degree of the arc direction and concentrated bias direction caused by the design of magnetic field distribution of the existing arc extinguishing system of the high-voltage direct-current contactor, reduces the ablation of the arc to the contactor contact and prolongs the service life of the high-voltage direct-current contactor.)

1. A high voltage dc contactor, comprising: the device comprises a shell (4), two fixed contacts (1), a movable contact (2), an armature (5), a yoke iron (6), a reset coil (7), a spring (8), a magnetic driving rod (9), an arc extinguish chamber (10) and a magnetic driving mechanism (17), wherein the two fixed contacts (1), the movable contact (2), the armature (5), the yoke iron (6), the reset coil (7), the spring (8), the magnetic driving rod (9);

the arc extinguish chamber (10) is positioned above the inner cavity of the shell (4), and the magnetic driving mechanism (17) is positioned at the bottom of the inner cavity of the shell (4);

the two static contacts (1) are symmetrically arranged on two sides of the inner cavity of the arc extinguish chamber (10);

the magnetic driving rod (9) is vertically arranged at the center line position of the shell (4); wherein, one end of the magnetic driving rod (9) extending into the arc extinguish chamber (10) is connected with the magnetic moving contact (2), and the other end of the magnetic driving rod passes through the yoke iron (6) and then is connected with the magnetic driving mechanism (17) through the armature iron (5);

the reset coil (7) is arranged between the yoke iron (6) and the armature iron (5) and positioned at two sides of the magnetic driving mechanism (17);

the spring (8) is wound on the magnetic driving rod (9).

2. The high voltage direct current contactor according to claim 1, further comprising: a static contact magnetic steel groove (12) and a static contact magnetic steel (14);

the static contact magnetic steel grooves (12) are arranged on two sides of the outer part of the arc extinguish chamber (10);

the static contact magnetic steel (14) is arranged in the static contact magnetic steel groove (12).

3. The high voltage direct current contactor according to claim 2, further comprising: a moving contact magnetic steel groove (3), a moving contact magnetic steel (15) and a moving contact magnetic steel sleeve (16);

the moving contact magnetic steel sleeve (16) is arranged on the outer side of the moving contact (2);

the moving contact magnetic steel groove (3) is horizontally arranged in the moving contact (2);

the moving contact magnetic steel (15) is arranged in the moving contact magnetic steel groove (3).

4. The high-voltage direct-current contactor according to claim 3, wherein a bias magnetic field generated by the moving contact magnetic steel (15) and the static contact magnetic steel (14) is perpendicular to magnetic fields generated by two sides of the arc extinguish chamber (10) and perpendicular to a z-axis direction, so that magnetic field components in each direction of an xy plane are ensured.

5. The HVDC contactor according to claim 4, wherein the direction of the easy magnetization axis of the fixed contact magnetic steel (14) and the movable contact magnetic steel (15) is parallel to the direction of the magnetic field, so as to prevent the magnetic performance of the magnetic steel from being degraded.

6. The high-voltage direct current contactor according to claim 1, characterized in that the moving contact (2) is made of tungsten-copper alloy.

7. High voltage direct current contactor according to claim 1, characterized in that the arc extinguishing chamber (10) is filled with a protective gas.

8. The high-voltage direct current contactor according to claim 1, characterized in that the moving contact (2) adopts a bridge contact and a double-spring structure, and the bridge contact structure has two disconnection points.

Technical Field

The invention belongs to the technical field of electronic components, and particularly relates to a high-voltage direct-current contactor.

Background

With the social development and technological progress, informatization, integration and intellectualization are deepened continuously, and the industries of aerospace, weapon systems, transportation and the like put forward higher and higher requirements on the voltage, power and reliability of the power system. The characteristics of high performance, high reliability and high efficiency of the high-power direct current power supply are considered as the inevitable trend of power supply and distribution of spacecraft, weaponry, rail transit and automobiles in the future. The high-power high-voltage direct-current contactor is used as a core device in a high-voltage direct-current power distribution system, and the performance and the reliability of the high-power high-voltage direct-current contactor are very important.

In the process of closing and opening the contactor, arc discharge inevitably occurs between the moving contact and the static contact. Under the action of high voltage and strong current, the gas between two electrodes is excited into charged plasma under the action of strong electric field to produce arc discharge, and the excited discharge arc has obvious ablation effect on the contact material. Further, the sintering of the arc to the contact of the high-voltage direct-current contactor is reduced, and the service life of the high-voltage direct-current contactor is prolonged, so that the important problem to be solved urgently by technical personnel in the field is solved.

Disclosure of Invention

The technical problem of the invention is solved: the defects of the prior art are overcome, the high-voltage direct-current contactor is provided, the problems of low deviation degree of the arc direction and concentrated bias direction caused by the design of magnetic field distribution of the arc extinguishing system of the conventional high-voltage direct-current contactor are solved, the ablation of the arc to the contactor contact is reduced, and the service life of the high-voltage direct-current contactor is prolonged.

In order to solve the technical problem, the invention discloses a high-voltage direct current contactor, which comprises: the device comprises a shell, two static contacts, a moving contact, an armature, a yoke, a reset coil, a spring, a magnetic driving rod, an arc extinguish chamber and a magnetic driving mechanism, wherein the two static contacts, the moving contact, the armature, the yoke, the reset coil, the spring, the magnetic driving rod, the arc extinguish chamber and the magnetic driving mechanism are arranged in;

the arc extinguish chamber is positioned above the inner cavity of the shell, and the magnetic driving mechanism is positioned at the bottom of the inner cavity of the shell;

the two static contacts are symmetrically arranged on two sides of the inner cavity of the arc extinguish chamber;

the magnetic driving rod is vertically arranged at the center line position of the shell; one end of the magnetic driving rod extending into the arc extinguish chamber is connected with the magnetic moving contact, and the other end of the magnetic driving rod penetrates through the yoke and is connected with the magnetic driving mechanism through the armature;

the reset coil is arranged between the yoke iron and the armature iron and positioned at two sides of the magnetic driving mechanism;

the spring is wound on the magnetic driving rod.

In above-mentioned high voltage direct current contactor, still include: a static contact magnetic steel groove and a static contact magnetic steel;

the static contact magnetic steel grooves are arranged on two sides of the outer part of the arc extinguish chamber;

the static contact magnetic steel is arranged in the static contact magnetic steel groove.

In above-mentioned high voltage direct current contactor, still include: the moving contact magnetic steel groove, the moving contact magnetic steel and the moving contact magnetic steel sleeve;

the moving contact magnetic steel sleeve is arranged on the outer side of the moving contact;

the moving contact magnetic steel groove is horizontally arranged in the moving contact;

the moving contact magnetic steel is arranged in the moving contact magnetic steel groove.

In the high-voltage direct-current contactor, the bias magnetic fields generated by the moving contact magnetic steel and the static contact magnetic steel are perpendicular to the magnetic fields generated on two sides of the arc extinguish chamber and perpendicular to the direction of the z axis, so that magnetic field components are ensured to exist in each direction of the xy plane.

In the high-voltage direct-current contactor, the direction of the easy magnetization axes of the fixed contact magnetic steel and the moving contact magnetic steel is parallel to the direction of the magnetic field, so that the magnetic property degradation of the magnetic steel is prevented。

In the high-voltage direct-current contactor, the moving contact is made of tungsten-copper alloy materials.

In the high-voltage direct-current contactor, a protective gas is filled in an arc extinguishing chamber.

In the high-voltage direct-current contactor, the moving contact adopts a bridge type contact and a double-spring structure, and the bridge type contact structure is provided with two disconnection points.

The invention has the following advantages:

(1) the invention discloses a high-voltage direct-current contactor, which solves the problems of low deviation degree of an electric arc direction and concentrated bias direction caused by the design of magnetic field distribution of an arc extinguishing system of the existing high-voltage direct-current contactor, reduces the ablation of the electric arc to a contactor contact, and prolongs the service life of the high-voltage direct-current contactor.

(2) The invention discloses a high-voltage direct-current contactor.A moving contact magnetic steel below a moving contact generates a bias magnetic field, and the magnetic induction intensity of the moving contact magnetic steel is close to the surface of the moving contactThe density is higher, so the magnetic field above the moving contact can be obviously enhanced, the deviation degree of the arc motion track is obviously improved, and the ablation resistance of the moving contact is enhanced.

(3) The invention discloses a high-voltage direct-current contactor.A bias magnetic field generated by moving contact magnetic steel is vertical to a magnetic field generated by static contact magnetic steel, and both the bias magnetic field and the magnetic field are vertical to the direction of a z axis. The plane where the moving contact is located forms magnetic fields in two orthogonal directions, so that each direction of the xy plane has a magnetic field component, the deviation degree of arc motion tracks in each direction can be effectively changed, and the ablation resistance of the moving contact is enhanced. Because each direction of the xy plane has a magnetic field component, the arc biased by the magnetic field in the y direction makes spiral motion in the zx plane family, and the arc biased by the magnetic field in the x direction makes spiral motion in the zy plane family. Because the electric arcs are essentially charged particles with different charges and plasmas formed by the charged particles, the electric arcs in the two plane families are vertical to each other, the probability of mutual neutralization of the different charges is obviously increased, the ablation capacity of the electric arcs is quickly weakened, and the ablation resistance of the movable contact is further enhanced.

(4) The invention discloses a high-voltage direct-current contactor.A moving contact can be processed by adopting a tungsten-copper alloy material, and compared with the traditional metal copper, the ablation resistance of the moving contact can be greatly improved.

(5) The invention discloses a high-voltage direct-current contactor, wherein a spring can adopt a double-spring design, so that contact separation under the conditions of high frequency and random vibration is avoided to the maximum extent while two contacts are ensured to be contacted simultaneously, reliable contact of products is ensured, and contact ablation is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a high-voltage direct-current contactor according to an embodiment of the invention;

fig. 2 is a schematic diagram of the magnetic field distribution of the high-voltage direct-current contactor according to the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.