Arc extinguishing structure of direct current contactor

Abstract

The arc extinguishing structure comprises a static contact, a fixing seat, a sealing ring, a movable contact, a magnetizer and an insulating seat, the static contact is arranged on the fixing seat, the fixing seat is connected with the sealing ring and the magnetizer, the sealing ring is connected with the magnetizer, the movable contact is arranged in a fixing seat bag, and the insulating seat is arranged in the fixing seat bag. And the insulating seat is arranged on the magnetizer and is connected with the magnetizer. The invention provides an arc extinguishing structure which comprises a magnetic quenching system and an arc extinguishing chamber cavity, so that when a high-power direct-current contactor switches on and off a load, an electric arc is lengthened along the direction of a maximum space under the action of the magnetic quenching system, the space utilization of the arc extinguishing chamber cavity is maximized, the load switching-on and switching-off power is improved, and meanwhile, the service life of the arc extinguishing chamber cavity is prolonged. Meanwhile, the special insulating seat is additionally arranged at the bottom, and after the magnetizer and the fixing seat are designed and assembled in a matched mode, the insulating performance after the load is switched on and off can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of contactors, and in particular relates to an arc extinguishing structure of a DC contactor. Background Art

[0002] When a high-power high-voltage DC contactor switches on and off a load, the arc moves from between the contacts to outside the contacts under the action of the magnetic blow-out arc extinguishing system, and is elongated in the arc extinguishing chamber until it is extinguished. As the load power increases, the arc extinguishing length will also increase. How to make the arc obtain the maximum length within the effective space has become the key to the design of high-power DC contactors.

[0003] The patent document with announcement number CN113628933A discloses a high-voltage sealed DC contactor with auxiliary contacts, including a ceramic seat, an auxiliary point rod and a contact point rod are fixedly connected to the ceramic seat, the ceramic seat is in the shape of a convex three-dimensional structure, a groove structure is provided on the outer surface of the ceramic seat, and an arc-extinguishing magnetic steel is provided in the groove structure, the ceramic seat sleeve is provided with a magnetic conductive bracket, and auxiliary point rods and contact point rods are fixedly installed on both sides of the ceramic seat. The shape of the ceramic seat directly separates the contact point rod part from the auxiliary point rod part, and there is no need to separate the contact point rod and the auxiliary point rod with glue for pressure resistance requirements on the outside, and the space occupied is small, the arc-extinguishing magnetic steel area is not affected, and the arc-extinguishing capacity is increased. However, the ceramic seat in this application is set at a right angle, the arc elongation range generated is limited, and the technical problem of stretching the arc to extinguish in a small cavity is not solved. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an arc extinguishing structure of a DC contactor.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides an arc extinguishing structure of a DC contactor, comprising a static contact, a fixed seat, a sealing ring, a moving contact, a magnetic conductor and an insulating seat, wherein the static contact is arranged on the fixed seat, the fixed seat is connected to the sealing ring and the magnetic conductor, the sealing ring is connected to the magnetic conductor, the moving contact is arranged in a fixed seat bag, the insulating seat is arranged on the magnetic conductor, and the insulating seat is connected to the magnetic conductor.

[0007] Preferably, the cross-section of the fixing seat is rectangular, the corners of the fixing seat are rounded, a hole and a magnetic arc extinguishing system are arranged on the fixing seat, two holes are symmetrically arranged, a step A is arranged on the edge of the hole, the step A is connected to the static contact, and the surface of the step A is metallized.

[0008] Preferably, a sink is provided between the two holes, and reinforcing ribs are provided on the inner wall of the fixing seat, and the length direction of the reinforcing ribs is parallel to the axial direction of the hole.

[0009] Preferably, a covering layer and a step B are provided on the side of the fixing seat away from the static contact, the covering layer is provided at the end of the fixing seat, the covering layer is metallized, the step B is provided on the inner wall of the fixing seat, and the step B is made of non-metallic material.

[0010] Preferably, the geometric relationship between the center of the hole and the outer shape of the fixing seat is: the extended line of the long side and the short side of the outer shape of the fixing seat intersect at point p, the midpoint of the short side of the fixing seat is point x, the midpoint of the long side is point y, the lines connecting points x, y and p form a right triangle, the height of the hypotenuse through point p of the right triangle is h, the height h is extended, and the extended line of height h intersects with the line from point x to x1, and the intersection is the center of the hole.

[0011] Preferably, the magnetic blow-out arc extinguishing system comprises a magnetic steel and a magnetic conductive sheet, wherein the magnetic steel is arranged on the outer wall of the fixing seat, and a side of the magnetic steel away from the fixing seat is connected to the magnetic conductive sheet.

[0012] Preferably, one magnet is provided on each of the four side outer walls of the fixing base, and the two magnets parallel to each other are symmetrically arranged, the magnet on the long side of the fixing base has the S pole facing inward, and the magnet on the short side of the fixing base has the N pole facing inward.

[0013] Preferably, the insulating seat comprises an insulating seat body and a step C, the insulating seat body and the step C are connected, a convex rib is arranged at the end of the insulating seat body, a groove B is arranged on the insulating seat body, and the groove B is located below the static contact.

[0014] Preferably, a buckle is provided on the outer wall of the step C, and an opening is provided on the step C.

[0015] Preferably, the sealing ring is a thin-walled L-shaped ring structure, the top of the sealing ring is welded to the bottom of the fixing seat, and the bottom of the sealing ring is welded to the magnetic conductor.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides an arc extinguishing structure, which includes a magnetic blow-out arc extinguishing system and a structural design of an arc extinguishing chamber cavity, so that when a high-power DC contactor breaks a load, the arc is elongated along the maximum spatial direction under the action of the magnetic blow-out arc extinguishing system, so that the space utilization of the arc extinguishing chamber cavity is maximized, and the volume of the arc extinguishing chamber cavity can be reduced while increasing the breaking load power. At the same time, a special insulating seat is added to the bottom, and after being designed and assembled with a magnetic conductor and a fixing seat, the insulation performance after breaking the load can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall cross-sectional view of the present invention;

[0019] Figure 2 is a schematic diagram of the magnetic blow-out arc extinguishing system of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the fixing seat of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the fixing seat of the present invention;

[0022] Figure 5 It is a schematic diagram of the insulating seat structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the insulating seat structure of the present invention;

[0024] In the figure: 1-static contact, 2-fixed seat, 21-hole, 22-step A, 23-sunk platform, 24-reinforcement rib, 25-covering layer, 26-step B, 3-sealing ring, 4-moving contact, 5-magnetic conductor, 6-insulating seat, 61-buckle, 62-convex rib, 63-groove B, 64-insulating seat body, 65-step C, 66-opening, 7-magnetic blow-out system, 71-magnetic steel, 72-magnetic sheet. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0026] Example:

[0027] like Figures 1 to 6 As shown, an arc extinguishing structure of a DC contactor includes a static contact 1, a fixed seat 2, a sealing ring 3, a moving contact 4, a magnetizer 5 and an insulating seat 6, wherein the static contact 1 is arranged on the fixed seat 2, the fixed seat 2 is connected to the sealing ring 3 and the magnetizer 5, the sealing ring 3 is connected to the magnetizer 5, the sealing ring 3 and the magnetizer 5 are sealed by laser welding, the moving contact 4 is arranged in the fixed seat 2, the insulating seat 6 is arranged on the magnetizer 5, and the insulating seat 6 is connected to the magnetizer 5.

[0028] The cross-section of the fixing seat 2 is rectangular, the fixing seat 2 is a ceramic seat, the corners of the fixing seat 2 are rounded, a hole 21 and a magnetic blow-out arc system 7 are set on the fixing seat 2, the ceramic seat 2 and the static contact 1 and the sealing ring 3 are fixed and sealed by brazing, two holes 21 are symmetrically arranged, a step A22 is set on the edge of the hole 21, the step A22 is welded to the static contact 1, and the surface of the step A22 is metallized.

[0029] A sink 23 is arranged between the two holes 21, and the sink 23 can increase the creepage distance between the static contacts 1. Four reinforcing ribs 24 are arranged on the inner wall of the fixing seat 2. The length direction of the reinforcing ribs 24 is parallel to the axial direction of the hole 21. Every two reinforcing ribs 24 are arranged on one side of the inner wall of the fixing seat 2 for guiding the movement of the moving contact 4.

[0030] A covering layer 25 and a step B26 are provided on the side of the fixing seat 2 away from the static contact 1. The covering layer 25 is provided at the end of the fixing seat 2, and the covering layer 25 is metallized. The step B26 is provided on the inner wall of the fixing seat 2, and the step B26 is made of non-metallic material. After the non-metallic step B26 is assembled with the insulating seat 6, the creepage distance between the contacts in the arc extinguishing chamber after the contact ablation and splashing can be increased, and the insulation performance of the contact after breaking the load can be improved, thereby improving the electrical life performance.

[0031] The geometric relationship between the center of the hole 21 and the outer shape of the fixing seat 2 is: the extended line of the long side and the short side of the outer shape of the fixing seat 2 intersects at point p, the midpoint of the short side of the fixing seat 2 is point x, the midpoint of the long side is point y, the line connecting the three points x, y and p forms a right triangle, the height of the hypotenuse through point p of the right triangle is h, the extended line of height h intersects with the line from point x to x1, and the intersection is the center of the hole 21. When the axis of the static contact 1 coincides with the center of the circle, under the action of the magnetic blow-out arc system 7, because the arc can be stretched to extinguish in a small cavity, a larger load power breaking capacity can be obtained through a smaller outer shape of the fixing seat 2. Among them, point p1 is symmetrical with point p, and h1 is the height of the line connecting the other side of the triangle symmetrical with h.

[0032] The magnetic arc extinguishing system 7 includes a magnetic steel 71 and a magnetic conductive sheet 72. The magnetic steel 71 is arranged on the outer wall of the fixed base 2. The side of the magnetic steel 71 away from the fixed base 2 is connected to the magnetic conductive sheet 72. Four magnetic conductive sheets 72 are arranged. The two ends of each magnetic conductive sheet 72 are respectively connected to the magnetic steel 71 on the side of the long side of the fixed base 2 and the magnetic steel 71 on the side of the short side of the fixed base 2 adjacent to the long side.

[0033] The magnetic conductive sheet 72 can reduce the air magnetic resistance and increase the magnetic induction intensity of the external circuit between the magnetic steels. Under the action of the magnetic blow-out arc extinguishing system 7, combined with the geometric structure of the fixing seat 2 of the present invention, the high-voltage DC contactor of the present invention can generate an arc that is elongated along the four rounded corners of the fixing seat 2 until it is extinguished when disconnecting the high-voltage DC load, thereby maximizing the space in the cavity of the fixing seat 2 in the direction of arc elongation, and the contact splashes onto the inner walls of the four rounded corners of the fixing seat 2 and the bottom insulating seat 6, which can effectively increase the contact breaking load and reduce the volume of the arc extinguishing chamber.

[0034] The magnetic steel 71 is respectively arranged on the outer walls of the four sides of the fixing base 2, and the two parallel magnetic steels 71 are symmetrically arranged. The magnetic steel 71 on the long side of the fixing base 2 has the S pole facing inward, and the magnetic steel 71 on the short side of the fixing base 2 has the N pole facing inward.

[0035] The insulating seat 6 includes an insulating seat body 64 and a step C65, the insulating seat body 64 and the step C65 are connected, a convex rib 62 is provided at the end of the insulating seat body 64, a groove B63 is provided on the insulating seat body 64, and the groove B63 is located below the static contact 1. The convex rib 62 and the groove 63 can effectively increase the creepage distance.

[0036] The outer wall of the step C65 is provided with a buckle 61, and the step C65 is provided with an opening 66. The buckle 61 can clamp the insulating seat 6 between the ceramic seat 2 and the magnetizer 5 after the insulating seat 6 is installed between the ceramic seat 2 and the magnetizer 5 without loosening.

[0037] The sealing ring 3 is a thin-walled L-shaped ring structure, which is processed by an extension process. The top of the sealing ring 3 is welded to the covering layer 25 at the bottom of the fixing seat 2 , and the bottom of the sealing ring 3 is welded to the magnetic conductor 5 .

[0038] The invention is applicable to high-voltage direct current contactors.

Claims

1. An arc extinguishing structure of a DC contactor, characterized in that: The invention comprises a static contact (1), a fixed seat (2), a sealing ring (3), a moving contact (4), a magnetic conductor (5) and an insulating seat (6), wherein the static contact (1) is arranged on the fixed seat (2), the fixed seat (2) is connected to the sealing ring (3) and the magnetic conductor (5), the sealing ring (3) is connected to the magnetic conductor (5), the moving contact (4) is arranged in the fixed seat (2), the insulating seat (6) is arranged on the magnetic conductor (5), and the insulating seat (6) is connected to the magnetic conductor (5).

2. The arc extinguishing structure of a DC contactor according to claim 1, characterized in that: The fixing seat (2) has a rectangular cross section, and the corners of the fixing seat (2) are rounded. A hole (21) and a magnetic blow-out arc system (7) are arranged on the fixing seat (2), two holes (21) are symmetrically arranged, and a step A (22) is arranged on the edge of the hole (21). The step A (22) is connected to the static contact (1), and the surface of the step A (22) is metallized.

3. The arc extinguishing structure of a DC contactor according to claim 2, characterized in that: A sink (23) is provided between the two holes (21), and a reinforcing rib (24) is provided on the inner wall of the fixing seat (2), wherein the length direction of the reinforcing rib (24) is parallel to the axial direction of the hole (21).

4. The arc extinguishing structure of a DC contactor according to claim 2, characterized in that: A covering layer (25) and a step B (26) are provided on a side of the fixing seat (2) away from the static contact (1); the covering layer (25) is provided at an end of the fixing seat (2); the covering layer (25) is metallized; the step B (26) is provided on an inner wall of the fixing seat (2); and the step B (26) is made of a non-metallic material.

5. The arc extinguishing structure of a DC contactor according to claim 2, characterized in that: The geometric relationship between the center of the hole (21) and the outer shape of the fixing seat (2) is as follows: the extended lines of the long side and the short side of the outer shape of the fixing seat (2) intersect at point p, the midpoint of the short side of the fixing seat (2) is point x, the midpoint of the long side is point y, the lines connecting the three points x, y and p form a right triangle, the height of the hypotenuse through point p of the right triangle is h, the height h is extended, and the extended line of height h intersects with the line connecting point x to x1, and the intersection is the center of the hole (21).

6. The arc extinguishing structure of a DC contactor according to claim 2, characterized in that: The magnetic blow-out arc extinguishing system (7) comprises a magnetic steel (71) and a magnetic conductive sheet (72); the magnetic steel (71) is arranged on the outer wall of the fixing seat (2); and the side of the magnetic steel (71) away from the fixing seat (2) is connected to the magnetic conductive sheet (72).

7. The arc extinguishing structure of a DC contactor according to claim 6, characterized in that: The magnetic steel (71) is arranged on each of the four side outer walls of the fixing seat (2), and the two magnetic steels (71) are arranged symmetrically and parallel to each other. The magnetic steel (71) on the long side of the fixing seat (2) has its S pole facing inwards, and the magnetic steel (71) on the short side of the fixing seat (2) has its N pole facing inwards.

8. The arc extinguishing structure of a DC contactor according to claim 1, characterized in that: The insulating seat (6) comprises an insulating seat body (64) and a step C (65), wherein the insulating seat body (64) and the step C (65) are connected, a convex rib (62) is provided at the end of the insulating seat body (64), and a groove B (63) is provided on the insulating seat body (64), wherein the groove B (63) is located below the static contact (1).

9. The arc extinguishing structure of a DC contactor according to claim 8, characterized in that: A buckle (61) is provided on the outer wall of the step C (65), and an opening (66) is provided on the step C (65).

10. The arc extinguishing structure of a DC contactor according to claim 1, characterized in that: The sealing ring (3) is in the form of a thin-walled L-shaped ring structure; the top of the sealing ring (3) is welded to the bottom of the fixing seat (2); and the bottom of the sealing ring (3) is welded to the magnetic conductor (5).

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