High-power direct current contactor

Abstract

The utility model discloses a high-power direct-current contactor, which comprises a base, a guide seat arranged in the base, a movable iron core assembly below the guide seat and a movable contact assembly above the guide seat, the moving contact assembly comprises an arc extinguishing ceramic structure, an arc extinguishing magnetic steel structure and a moving contact. The arc-extinguishing ceramic structure comprises two arc-extinguishing ceramics which are oppositely arranged on the guide seat; the arc-extinguishing ceramics form a mounting space by a bottom plate and two U-shaped plates which are oppositely arranged on the bottom plate; and the three magnetic steels are arranged to enhance the magnetic arc blow-out capability and prolong the electrical life of the product.

Description

Technical Field

[0001] The utility model relates to a high-power DC contactor. Background Art

[0002] A DC contactor is a contactor whose core is controlled by a DC coil. Its load can be either DC or AC. However, the current DC contactor has the following disadvantages:

[0003] 1. The existing DC contactor has poor magnetic arc blowing capability and the product electrical life is not long.

[0004] 2. The existing DC contactor plastic inner cavity has poor arc cooling capability, a long arc cooling time, and poor electrical life capability.

[0005] 3. The contact surface of the static contact of the existing DC contactor is a plane, and the arc is difficult to be blown out during magnetic arc blowing, thereby damaging the contact surface. Utility Model Content

[0006] In view of the above problems, the purpose of the utility model is to provide a high-power DC contactor with a long electrical life.

[0007] The technical solution to realize the utility model is as follows

[0008] A high-power DC contactor comprises a base, a guide seat arranged in the base, a moving iron core assembly below the guide seat and a moving contact assembly above the guide seat; the moving contact assembly comprises an arc-extinguishing ceramic structure, an arc-extinguishing magnetic steel structure and a moving contact; the arc-extinguishing ceramic structure comprises two arc-extinguishing ceramics relatively mounted on the guide seat, and the arc-extinguishing ceramics are surrounded by a bottom plate and two U-shaped plates relatively mounted on the bottom plate to form an installation space.

[0009] Both sides of the U-shaped plate are provided with chamfers.

[0010] The centers of the opposite surfaces of the two U-shaped plates are both provided with protruding convex strips.

[0011] The arc-extinguishing magnetic steel structure includes an inner support cover arranged on a guide seat, the inner support cover is composed of two ceramic mounting cavities and a transition cavity between the two ceramic mounting cavities, and openings communicating with the ceramic mounting cavities are arranged on both side surfaces of the transition cavity.

[0012] Two baffles are also arranged on the inner support cover, and the two baffles are located outside the corresponding ceramic installation cavity. A first magnetic steel slot is formed between the baffle and the outer side surface of the corresponding ceramic installation cavity, and a first magnetic steel slot is provided in each of the first magnetic steel slots; a groove on the front side of the transition cavity and a U-shaped plate on the inner support cover form a second magnetic steel slot, and a second magnetic steel slot is provided in each of the second magnetic steel slots.

[0013] The moving iron core assembly comprises a moving iron core, a linkage rod is installed in the moving iron core, and a heightened surface is added to the top surface of the moving iron core.

[0014] The above technical solution is adopted. 1. With an auxiliary contact structure, the auxiliary contacts previously need to be soldered on the PCB first, and then the terminals are soldered in the PCB to form an assembly, and then the assembly is inserted into the inner support cover; the new design optimizes the inner support cover structure, and the micro switch can be directly inserted, which can reduce costs.

[0015] 2. The three magnets are arranged so that the middle magnet is arranged eccentrically within the original volume of the product, achieving a smaller volume with a stronger magnetic field. The other two magnets are arranged in a straight line with the static contact to form a non-polar structure magnetic arc blowing system. Moreover, the three magnets are wrapped in the inner support cover to increase the creepage distance between the contacts and enhance the magnetic arc blowing capability.

[0016] 3. Improve the electrical life of the product through arc-extinguishing ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the inner support cover of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the movable contact assembly of the utility model from a top view;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the moving contact assembly of the utility model;

[0021] Figure 5 This is a schematic diagram of the internal support cover of the utility model when viewed from above;

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the arc-extinguishing ceramic of the utility model;

[0023] In the accompanying drawings, 1 is a base, 2 is a guide seat, 3 is a moving iron core assembly, 4 is a moving contact assembly, 6 is an arc-extinguishing magnetic steel structure, 7 is a moving contact, 8 is an arc-extinguishing ceramic, 9 is a bottom plate, 10 is a U-shaped plate, 12 is a chamfer, 13 is a convex strip, 14 is an inner support cover, 15 is a ceramic mounting cavity, 16 is a transition cavity, 17 is an opening, 18 is a baffle, 19 is a first magnetic steel slot, 20 is a first magnetic steel, 21 is a second magnetic steel slot, 22 is a second magnetic steel, 23 is a guide groove, 24 is a moving iron core, 25 is a linkage rod, and 26 is a heightened surface. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] A high-power DC contactor includes a base 1, a guide seat 2 arranged in the base, a moving iron core assembly 3 below the guide seat and a moving contact assembly 4 above the guide seat; the moving contact assembly includes an arc-extinguishing ceramic structure, an arc-extinguishing magnetic steel structure 6 and a moving contact 7; the arc-extinguishing ceramic structure includes two arc-extinguishing ceramics 8 relatively installed on the guide seat, and the arc-extinguishing ceramics are surrounded by a bottom plate 9 and two U-shaped plates 10 relatively arranged on the bottom plate to form an installation space. The arc-extinguishing ceramic structure improves the arc-extinguishing ability of the product ceramics, and the cavity formed by the ceramics has better arc cooling ability than plastic parts, and has better durability during long-term operation; wherein the high-voltage end load contact adopts a non-polarity design, and the low-voltage end coil achieves lower energy consumption at the control end through PWM broadcasting.

[0026] The U-shaped plate is provided with chamfers 12 on both sides. The chamfers on both sides of the U-shaped plate make the cross section of the U-shaped plate trapezoidal. Adding the chamfer structure can make the arc extinguishing and spreading faster.

[0027] The centers of the opposite surfaces of the two U-shaped plates are provided with protruding convex strips 13. The convex strips cooperate with the U-shaped plates to effectively disperse the arc.

[0028] The arc-extinguishing magnetic steel structure includes an inner support cover 14 covered on the guide seat, the inner support cover is composed of two ceramic mounting cavities 15 and a transition cavity 16 between the two ceramic mounting cavities, and both sides of the transition cavity are provided with openings 17 connected to the ceramic mounting cavity. The ceramic mounting cavity is adapted to the arc-extinguishing ceramic structure for easy installation.

[0029] The inner support cover is also provided with two baffles 18, which are located outside the corresponding ceramic installation cavity, and a first magnetic steel slot 19 is formed between the baffle and the outer side of the corresponding ceramic installation cavity, and a first magnetic steel 20 is arranged in each of the first magnetic steel slots; a groove on the front of the transition cavity and the U-shaped plate on the inner support cover form a second magnetic steel slot 21, and a second magnetic steel 22 is arranged in the second magnetic steel slot. The three arc-extinguishing magnetic steel structures make the magnetic field strength in the working area stronger and the magnetic field lines more uniform, which can improve the magnetic arc blowing ability of the product and further improve the electrical life of the product.

[0030] The first magnetic steel and the second magnetic steel are both provided with guide grooves 23, and the first magnetic steel slot and the second magnetic steel slot are both provided with guide flanges used in conjunction with the guide grooves. During installation, the guide grooves and the guide flanges have good guiding and foolproofing effects.

[0031] The moving iron core assembly includes a moving iron core 24, a linkage rod 25 is installed in the moving iron core, and a heightened surface 26 is added to the top surface of the moving iron core. The key contact surface is heightened, and the flatness and roughness of the heightened surface are strictly controlled. The flatness and roughness of the heightened surface are required to be higher, so that the leakage magnetic flux is smaller.

Claims

1. A high-power DC contactor, characterized in that: It includes a base, a guide seat arranged in the base, a moving iron core assembly below the guide seat and a moving contact assembly above the guide seat; the moving contact assembly includes an arc-extinguishing ceramic structure, an arc-extinguishing magnetic steel structure and a moving contact; the arc-extinguishing ceramic structure includes two arc-extinguishing ceramics relatively installed on the guide seat, and the arc-extinguishing ceramics are surrounded by a bottom plate and two U-shaped plates relatively arranged on the bottom plate to form an installation space.

2. A high-power DC contactor according to claim 1, characterized in that: Both sides of the U-shaped plate are provided with chamfers.

3. A high-power DC contactor according to claim 1, characterized in that: The centers of the opposite surfaces of the two U-shaped plates are both provided with protruding convex strips.

4. A high-power DC contactor according to claim 1, characterized in that: The arc-extinguishing magnetic steel structure includes an inner support cover arranged on a guide seat, the inner support cover is composed of two ceramic mounting cavities and a transition cavity between the two ceramic mounting cavities, and openings communicating with the ceramic mounting cavities are arranged on both side surfaces of the transition cavity.

5. A high-power DC contactor according to claim 4, characterized in that: Two baffles are also arranged on the inner support cover, and the two baffles are located outside the corresponding ceramic installation cavity. A first magnetic steel slot is formed between the baffle and the outer side surface of the corresponding ceramic installation cavity, and a first magnetic steel slot is provided in each of the first magnetic steel slots; a groove on the front side of the transition cavity and a U-shaped plate on the inner support cover form a second magnetic steel slot, and a second magnetic steel slot is provided in each of the second magnetic steel slots.

6. A high-power DC contactor according to claim 1, characterized in that: The moving iron core assembly comprises a moving iron core, a linkage rod is installed in the moving iron core, and a heightened surface is added to the top surface of the moving iron core.

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