Insulating main contact contact structure and contactor

Abstract

The invention discloses an insulating main contact contact structure and a contactor, the insulating main contact contact structure comprises a base part, an insulating shaft sleeve, a transmission rod, an arc extinguishing grid sheet, a screw A, a movable contact and a fixing assembly, the insulating shaft sleeve is arranged in the base part, the transmission rod penetrates through the insulating shaft sleeve, the transmission rod penetrates through the base part through the insulating shaft sleeve, and the arc extinguishing grid sheet is arranged on the base part. The arc extinguishing grid sheet is connected and fastened with the base part through a screw A. The movable contact is arranged on the insulating shaft sleeve. In the using process of the prepared contactor, due to the fact that the arc extinguishing grid pieces are designed between the contacts, the arc burning time of the contacts of the contactor in the on-off process is shortened, and ablation splashes of the contacts are reduced; and meanwhile, the insulated gate sheet with the inverted E-shaped cross section is designed and assembled on the base, so that the insulating property between the static contacts is improved, the insulating property between the main contacts of the contactor is improved, and the service life of the contactor is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of electromechanical technology, and in particular relates to an insulating main contact structure and a contactor. Background Art

[0002] In the application of contactors, since the load switched by the main contacts is generally large, a large amount of contact ablation splashes will be formed under the ablation effect of the arc during the contact breaking process. These contact ablation splashes often adhere to the mounting base surface and the internal control surface around the static contact. This causes the insulation performance between the main contacts of the contactor to decrease in the middle and late stages of its life, reducing the service life of the contactor. Therefore, there is a need for an insulating main contact contact structure that can reduce the impact of contact ablation splashes on the insulation performance of the contactor, so as to increase the service life of the contactor.

[0003] The patent document with the announcement number CN116721896A discloses a high-voltage DC sealed contactor, including an outer shell, a static contact and a moving spring, wherein the static contact and the moving spring are arranged relative to each other, and the static contact is defined as being relatively arranged above the moving spring, and the moving spring is relatively arranged below the static contact, and further includes an insulating cover and an inner frame installed inside the outer shell, wherein the insulating cover is arranged above the inner frame, and a contact chamber is arranged below the inner frame, wherein the moving spring is arranged in the contact chamber, and the static contact passes through the insulating cover and the inner frame so that the lower static contact of the static contact is also arranged in the contact chamber, and a sealing ring is fixedly arranged on the surrounding side of the static contact and between the insulating cover and the inner frame. The contactor isolates the arc extinguishing space in the contact chamber from the metal parts outside the contact chamber, so as to prevent the evaporation generated by the moving spring during the life test or long-term use from splashing into the cavity outside the contact chamber. However, the metal parts are composed of multiple components, not a single component as a whole, which increases the installation time.

[0004] The patent document with the announcement number CN217061924U discloses a high-insulation performance auxiliary contact structure of a DC contactor, including: a shielding shell and an auxiliary static spring sheet, an auxiliary dynamic spring sheet and an auxiliary insulating push rod that can move up and down and are arranged on the shielding shell, the auxiliary insulating push rod can be pushed upward by the dynamic contact assembly in the DC contactor to drive the auxiliary dynamic spring sheet to contact and conduct with the auxiliary static spring sheet to trigger the signal; the auxiliary insulating push rod is provided with an annular concave-convex structure around the periphery to form a creepage path along its outer edge on the concave-convex structure. The high-insulation performance auxiliary contact structure of the DC contactor can increase the creepage distance between the main contact and the auxiliary dynamic spring sheet and the auxiliary static spring sheet, improve its insulation performance, and will not increase the product. The patent adopts a structural method of matching the concave-convex structure to increase the creepage distance, thereby achieving the improvement of the contact insulation performance, rather than setting a blocking structure to achieve the function of reducing the influence of contact erosion splashes on the insulation performance of the contactor. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an insulating main contact structure and a contactor.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides an insulating main contact contact structure, comprising a base part, an insulating sleeve, a transmission rod, an arc-extinguishing grid, a screw A, a moving contact and a fixing assembly, wherein the insulating sleeve is arranged in the base part, the transmission rod passes through the insulating sleeve, the transmission rod passes through the base part through the insulating sleeve, the arc-extinguishing grid is connected and fastened to the base part through the screw A, and the moving contact is arranged on the insulating sleeve.

[0008] Preferably, the fixing assembly includes an insulating sleeve, a fixed shaft sleeve and an elastic member, the moving contact is connected to the insulating sleeve, one end of the elastic member is connected to the insulating sleeve, the other end of the elastic member is connected to the fixed shaft sleeve, the transmission rod passes through the fixed shaft sleeve for connection, an insulating gasket is arranged between the arc extinguishing grid and the base part, an opening is arranged on one side of the insulating sleeve, and the opening is arc-shaped.

[0009] Preferably, the base part includes a static reed part, a base, an insulating grid, and a screw B. The static reed part and the insulating grid are connected to the top of the base, and the static reed part is fastened to the base by screws B. The static reed part is symmetrically arranged on both sides of the insulating grid. A limit ring is arranged on the transmission rod, and the limit ring is arranged on the side of the transmission rod away from the fixed component. A moving contact inclined surface is arranged on the moving contact, and the moving contact inclined surface is arranged close to one end of the base part.

[0010] Preferably, a gasket and a spring gasket are arranged between the screw B and the base, the screw B passes through the gasket and the spring gasket, one side of the gasket is connected to the spring gasket, and the other side of the gasket is connected to the base.

[0011] Preferably, the static reed part includes a static reed and a static contact, the static contact is arranged at one end of the static reed, and a through hole is arranged at the other end of the static reed. A mounting groove and a groove A are arranged on the base, and the static reed is placed in the mounting groove. The top height of the static reed is less than or equal to the top height of the base.

[0012] Preferably, the axial cross-section of the insulating grid is in a mountain shape, and the insulating grid includes a circular ring portion and an extended portion, and two ends of the circular ring portion are respectively connected to the extended portion and are symmetrically arranged, and the extended portion is rectangular.

[0013] Preferably, the annular portion and the extension portion are arranged vertically, a groove B is arranged on one side of the annular portion, a ring is arranged in the groove B, a groove C is arranged on one side of the extension portion, a baffle is arranged in the groove C, and the annular ring is connected to the baffle.

[0014] Preferably, the static contact is in a crescent shape, and an inclined surface is provided on the static contact, and the inclined surface forms an angle of 20-60° with the contact surface between the static contact and the base.

[0015] Preferably, the method for installing the insulated main contact structure comprises the following steps:

[0016] S1: Braze the static spring and the static contact to form a static spring part, and then assemble the static spring part to the base through screws B, washers, and spring washers;

[0017] S2: After the insulating grid is installed on the above base to form a base part, the transmission rod is passed through the insulating sleeve, the moving contact, the insulating sleeve, the elastic member and the fixed sleeve in sequence, and is fastened with the fixed sleeve, and the fixed sleeve and the transmission rod are threadedly connected to obtain component A;

[0018] S3: The assembled component A is transferred to the base for connection, and finally the insulating sheet and arc-extinguishing grid are assembled to the static spring sheet with screws A to complete the installation.

[0019] A contactor prepared using the above-mentioned insulating main contact structure.

[0020] The beneficial effects of the present invention are:

[0021] During use of the contactor prepared by the present invention, since arc extinguishing grids are designed between contacts, the arc burning time of the contactor during the contact breaking process is shortened and the ablation splash of the contacts is reduced; at the same time, an insulating grid with an inverted mountain-shaped cross-section is designed and assembled on the base, which improves the insulation performance between the static contacts, thereby improving the insulation performance between the main contacts of the contactor and increasing the service life of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 is a cross-sectional view of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the base part of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the base part of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the static reed portion 11 of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the insulating grid of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the insulating grid of the present invention;

[0029] Figure 8 AA is a schematic cross-sectional view of the insulating grid of the present invention;

[0030] Fig. 9 BB is a schematic cross-sectional view of the insulating grid of the present invention;

[0031] In the figure: 1-base part, 2-insulating sleeve, 3-transmission rod, 31-limiting ring, 4-insulating gasket, 5-arc extinguishing grid, 6-screw A, 7-moving contact, 71-moving contact inclined surface, 8-insulating sleeve, 81-opening, 9-fixed sleeve, 10-elastic member, 11-static spring piece part, 12-base, 121-mounting groove, 122-groove A, 13-insulating grid, 131-circular ring part, 132-extension part, 133-groove B, 134-circular ring, 135-groove C, 136-blocking piece, 14-screw B, 15-gasket, 16-spring washer, 17-static spring piece, 171-through hole, 18-static contact, 181-inclined surface. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0033] Example:

[0034] like Figures 1 to 9 As shown, an insulated main contact contact structure includes a base part 1, an insulating sleeve 2, a transmission rod 3, an arc extinguishing grid 5, a screw A6, a moving contact 7 and a fixing assembly, wherein the insulating sleeve 2 is arranged in the base part 1, the transmission rod 3 passes through the insulating sleeve 2, the transmission rod 3 passes through the base part 1 through the insulating sleeve 2, the arc extinguishing grid 5 is connected and fastened with the base part 1 through the screw A6, the moving contact 7 is arranged on the insulating sleeve 2, and the screw hole for the screw A6 on the base 12 is a countersunk hole. The arc extinguishing grid 5 can reduce the arcing time of the contact during the contact breaking process and reduce the ablation and splashing of the contact.

[0035] The fixed assembly includes an insulating sleeve 8, a fixed shaft sleeve 9 and an elastic member 10, the moving contact 7 is connected to the insulating sleeve 8, one end of the elastic member 10 is connected to the insulating sleeve 8, and the other end of the elastic member 10 is connected to the fixed shaft sleeve 9, the elastic member 10 is an overtravel compression spring, the transmission rod 3 passes through the fixed shaft sleeve 9 for connection, an insulating gasket 4 is arranged between the arc extinguishing grid 5 and the base part 1, an opening 81 is arranged on one side of the insulating sleeve 8, and the opening 81 is in an arc shape. The arc extinguishing grid 5 is symmetrically arranged at two locations, and the moving contact 7 moves in the area surrounded by the openings 81 of the two arc extinguishing grids 5.

[0036] The base portion 1 includes a static spring portion 11, a base 12, an insulating grid 13, and a screw B14. The static spring portion 11 and the insulating grid 13 are connected to the top of the base 12. The static spring portion 11 is fastened to the base 12 by means of screws B14. The static spring portion 11 is symmetrically arranged on both sides of the insulating grid 13. The arc-extinguishing grid 5 is arranged on the base 12. The arc-extinguishing grid 5 is located above the static spring portion 17. A limiting ring 31 is arranged on the transmission rod 3. The limiting ring 31 is arranged on the side of the transmission rod 3 away from the fixed component.

[0037] A gasket 15 and a spring washer 16 are arranged between the screw B14 and the base 12 . The screw B14 passes through the gasket 15 and the spring washer 16 . One side of the gasket 15 is connected to the spring washer 16 , and the other side of the gasket 15 is connected to the base 12 .

[0038] The static reed part 11 includes a static reed 17 and a static contact 18, wherein the static contact 18 is arranged at one end of the static reed 17, and a through hole 171 is arranged at the other end of the static reed 17. A mounting groove 121 and a groove A122 are arranged on the base 12, and the static reed 17 is placed in the mounting groove 121. The top height of the static reed 17 is less than or equal to the top height of the base 12.

[0039] The axial cross section of the insulating grid 13 is in a mountain shape. The insulating grid 13 includes a circular ring portion 131 and an extension portion 132. Both ends of the circular ring portion 131 are connected to the extension portion 132 symmetrically. The extension portion 132 is arranged in the groove A122 and is rectangular.

[0040] The annular portion 131 and the extension portion 132 are arranged vertically, a groove B133 is arranged on one side of the annular portion 131, a ring 134 is arranged in the groove B133, a groove C135 is arranged on one side of the extension portion 132, a baffle 136 is arranged in the groove C135, and the annular portion 134 is connected to the baffle 136. The annular portion 134 and the baffle 136 are arranged on the same side, and the structure of the annular portion 134 and the baffle 136 eliminates the influence of contact ablation splashes on the insulation performance between the static contacts 18 on both sides during the service life.

[0041] The static contact 18 is in a crescent shape, and an inclined surface 181 is provided on the static contact 18. The inclined surface 181 forms an angle of 20-60° with the contact surface between the static contact 18 and the base 12, preferably an angle of 30°. The design benefit of this structure is that: under the same volume structure, the contact area between the static contact 18 and the moving contact 7 is increased, and at the same time, the moving contact inclined surface 71 provided on the moving contact 7 makes it unnecessary to set a motion guide for the moving contact 7.

[0042] The movable contact 7 is provided with a movable contact inclined surface 71, which is arranged close to one end of the base portion 1. The movable contact inclined surface 71 is used to correspond to the inclined surface 181, so that the contact area between the movable contact 7 and the static contact 18 is increased.

[0043] The method for installing the insulated main contact structure comprises the following steps:

[0044] S1: Braze the static spring 17 and the static contact 18 to form the static spring part 11, and then assemble the static spring part 11 to the base 12 through the screw B14, the gasket 15 and the spring washer 16;

[0045] S2: After the insulating grid 13 is installed on the above base to form the base part 1, the transmission rod 3 is passed through the insulating sleeve 2, the moving contact 7, the insulating sleeve 8, the elastic member 10 and the fixed sleeve 9 in sequence, and is fastened with the fixed sleeve 9, and the fixed sleeve 9 and the transmission rod 3 are threadedly connected to obtain the component A;

[0046] S3: The assembled component A is transferred to the base 12 for connection, and finally the insulating sheet 4 and the arc-extinguishing grid 5 are assembled to the static spring sheet 17 with screws A6 to complete the installation.

Claims

1. An insulated main contact structure, characterized in that: The invention comprises a base part (1), an insulating sleeve (2), a transmission rod (3), an arc extinguishing grid (5), a screw A (6), a moving contact (7) and a fixing assembly. The insulating sleeve (2) is arranged in the base part (1), the transmission rod (3) passes through the insulating sleeve (2), the transmission rod (3) passes through the base part (1) through the insulating sleeve (2), the arc extinguishing grid (5) is connected and fastened to the base part (1) through the screw A (6), and the moving contact (7) is arranged on the insulating sleeve (2).

2. An insulated main contact structure according to claim 1, characterized in that: The fixing assembly comprises an insulating sleeve (8), a fixed shaft sleeve (9) and an elastic member (10); the moving contact (7) is connected to the insulating sleeve (8); one end of the elastic member (10) is connected to the insulating sleeve (8); the other end of the elastic member (10) is connected to the fixed shaft sleeve (9); the transmission rod (3) passes through the fixed shaft sleeve (9) for connection; an insulating gasket (4) is arranged between the arc extinguishing grid (5) and the base part (1); an opening (81) is arranged on one side of the insulating sleeve (8); and the opening (81) is in an arc shape.

3. An insulated main contact structure according to claim 1, characterized in that: The base part (1) comprises a static spring piece part (11), a base (12), an insulating grid piece (13), and a screw B (14); the static spring piece part (11) and the insulating grid piece (13) are connected to the top of the base (12); the static spring piece part (11) is connected and fastened to the base (12) by means of the screw B (14); the static spring piece part (11) is symmetrically arranged on both sides of the insulating grid piece (13); a limiting ring (31) is arranged on the transmission rod (3); the limiting ring (31) is arranged on a side of the transmission rod (3) away from the fixed component; and a moving contact inclined surface (71) is arranged on the moving contact (7); the moving contact inclined surface (71) is arranged close to one end of the base part (1).

4. An insulated main contact structure as claimed in claim 3, characterized in that: A gasket (15) and a spring washer (16) are arranged between the screw B (14) and the base (12); the screw B (14) passes through the gasket (15) and the spring washer (16); one side of the gasket (15) is connected to the spring washer (16), and the other side of the gasket (15) is connected to the base (12).

5. An insulated main contact structure as claimed in claim 3, characterized in that: The static reed sheet part (11) comprises a static reed sheet (17) and a static contact (18), wherein the static contact (18) is arranged at one end of the static reed sheet (17), and a through hole (171) is arranged at the other end of the static reed sheet (17). A mounting groove (121) and a groove A (122) are arranged on the base (12), and the static reed sheet (17) is placed in the mounting groove (121). The top height of the static reed sheet (17) is less than or equal to the top height of the base (12).

6. An insulated main contact structure as claimed in claim 3, characterized in that: The axial cross section of the insulating grid plate (13) is in the shape of a mountain. The insulating grid plate (13) comprises a circular ring portion (131) and an extension portion (132). Two ends of the circular ring portion (131) are respectively connected to the extension portion (132) and are symmetrically arranged. The extension portion (132) is rectangular.

7. An insulated main contact structure according to claim 6, characterized in that: The annular portion (131) and the extension portion (132) are arranged vertically; a groove B (133) is arranged on one side of the annular portion (131); a ring (134) is arranged in the groove B (133); a groove C (135) is arranged on one side of the extension portion (132); a baffle (136) is arranged in the groove C (135); and the annular ring (134) is connected to the baffle (136).

8. An insulated main contact structure as claimed in claim 5, characterized in that: The static contact (18) is in a half-crescent shape, and an inclined surface (181) is provided on the static contact (18), wherein the inclined surface (181) forms an angle of 20-60° with the contact surface between the static contact (18) and the base (12).

9. An insulated main contact structure according to claim 1, characterized in that: The method for installing the insulated main contact structure comprises the following steps: S1: Brazing the static reed (17) and the static contact (18) to form a static reed portion (11), and then assembling the static reed portion (11) onto the base (12) by means of screws B (14), washers (15), and spring washers (16); S2: After the insulating grid (13) is installed on the above-mentioned base to form the base part (1), the transmission rod (3) is then passed through the insulating sleeve (2), the moving contact (7), the insulating sleeve (8), the elastic member (10) and the fixed sleeve (9) in sequence, and is fastened with the fixed sleeve (9), and the fixed sleeve (9) and the transmission rod (3) are threadedly connected to obtain component A; S3: The assembled component A is transferred to the base (12) for connection, and finally the insulating sheet (4) and the arc-extinguishing grid sheet (5) are assembled onto the static spring sheet (17) using screws A (6) to complete the installation.

10. A contactor manufactured using the insulated main contact structure according to claims 1 to 9.

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