A single-pole moving contact with bidirectional pressure

Abstract

The present invention relates to a single-pole moving contact with bidirectional pressure. The moving contact piece is moved to the middle position by the cooperation between the middle end connecting portion of a special-shaped torsion spring and the middle end groove of the torsion spring. When the moving contact on one side closes toward the static contact, the moving contact piece is pushed backward by the static contact. At this time, the special-shaped torsion spring provides pressure to press the moving contact against the static contact, ensuring a tight connection between the moving contact and the static contact. When the moving contact on the other side closes toward the static contact, the special-shaped torsion spring can also provide pressure to that side.

Description

Technical Field

[0001] The invention relates to a contact system of a dual-power automatic transfer switch, in particular to a single-pole moving contact with bidirectional pressure. Background Art

[0002] Many industries and sectors have very high requirements for power supply reliability. To ensure power continuity, many important applications use dual-power automatic transfer switches to power electrical appliances. As an essential power switching device, its main function is to automatically switch to the backup power source to continue supplying power to the load when the normal power source fails, and automatically switch back when the power returns to normal, thus meeting the power switching requirements of low-voltage power supply systems.

[0003] Current dual-power automatic transfer switches, which can simultaneously disconnect both the primary and backup power sources, typically use two stationary contacts to sandwich a moving contact. These two stationary contacts apply opposing pressure to compress the moving contact, and a rotating shaft controls the moving contact to contact different stationary contacts to connect different power sources. This contact system cannot reset to an intermediate position, and the structure providing pressure to the moving contact is complex, resulting in high production costs. Summary of the Invention

[0004] In view of the above-mentioned shortcomings, the present invention provides a single-pole moving contact with a simple structure and bidirectional pressure.

[0005] In order to achieve the above objectives, the present invention adopts a single-pole moving contact with bidirectional pressure, including a moving contact piece, an insulating seat, and a special-shaped torsion spring. A central axis hole is formed in the center of the insulating seat, and the moving contact piece is arranged in the insulating seat. The two sides of the moving contact piece extend symmetrically from the insulating seat to form a moving contact point. The special-shaped torsion spring is connected between the moving contact piece and the insulating seat. The special-shaped torsion spring includes a middle-end connecting part, two torsion spring parts connected at both ends of the middle-end connecting part, and end connecting parts respectively connected to the outer ends of the two torsion spring parts. A torsion spring middle-end groove is provided on the moving contact piece, and two torsion spring end holes are formed on the inner wall of the insulating seat. The middle-end connecting part of the special-shaped torsion spring is arranged in the torsion spring middle-end groove of the moving contact piece, and the two end connecting parts of the special-shaped torsion spring are respectively inserted into the two torsion spring end holes of the insulating seat. The two torsion spring parts of the special-shaped torsion spring provide forces in opposite directions to drive the middle-end connecting part to be in the middle position.

[0006] The present invention uses the mid-end connection portion of a special-shaped torsion spring to cooperate with the mid-end groove of the torsion spring to force the moving contact piece toward the middle position. When the moving contact on one side closes toward the static contact, the moving contact piece is pushed backward by the static contact. At this time, the special-shaped torsion spring provides pressure to press the moving contact against the static contact, ensuring a tight connection between the moving contact and the static contact. When the moving contact on the other side closes toward the static contact, the special-shaped torsion spring can also provide pressure to that side. The beneficial effect of the present invention is that the special-shaped torsion spring has a simple structure. The special-shaped torsion spring provides bidirectional pressure to the moving contact piece through connection with the moving contact piece and the insulating seat. It has a small number of assembly parts, a simple overall structure, and reliable performance.

[0007] The present invention is further configured such that the two torsion spring parts of the special-shaped torsion spring are wound in opposite directions starting from the middle connecting part. The above solution ensures that the middle connecting part tends to the middle position.

[0008] The present invention further provides a configuration in which a contact slot is formed on the insulating base, a movable contact piece is disposed within the contact slot, and two rivets are disposed within the contact slot. A curved rivet slot is formed on the movable contact piece corresponding to the rivets, and the rivet slot cooperates with the rivet to enable the movable contact piece to rotate about the center of the insulating base. This solution provides a position limit and movement space for the movable contact piece by allowing the movable contact piece to rotate relative to the insulating base through the movement of the rivet slot over the rivet.

[0009] The present invention is further configured such that a torsion spring groove centered at the central axis hole is formed in the insulating seat, and the torsion spring portion of the special-shaped torsion spring is arranged in the torsion spring groove. The torsion spring groove provides an installation space for the torsion spring.

[0010] The present invention further provides that the insulating seat comprises an insulating base and an insulating cover, wherein a splicing groove and a splicing block are formed on the insulating base, and a splicing block and a splicing groove are correspondingly formed on the insulating cover. The insulating base and the insulating cover are positioned and spliced ​​together through the splicing block and the splicing groove. The insulating base and the insulating cover have the same structure, which saves mold costs, and the splicing between the insulating base and the insulating cover is convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an exploded view of a specific embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of a specific embodiment of the present invention with the insulating seat removed.

[0013] Figure 3 Schematic diagram of a special-shaped torsion spring according to a specific embodiment of the present invention.

[0014] Figure 4 Schematic diagram of an insulating base according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figures 1-4 As shown, a specific embodiment of the present invention is a single-pole moving contact with bidirectional pressure, including a moving contact piece 1, an insulating seat 2, and a special-shaped torsion spring 3. The center of the insulating seat 2 forms a central axis hole 26. The insulating seat 2 is composed of an insulating base 21 and an insulating upper cover 22. A contact groove 23 is correspondingly formed on the mating surface of the insulating base 21 and the insulating upper cover 22. The moving contact piece 1 is arranged in the contact groove 23. The two sides of the moving contact piece 1 symmetrically extend from the contact groove 23 of the insulating seat 2 to form a moving contact point 11. The contact groove 23 is symmetrical. Two rivets 4 are provided, and an arc-shaped rivet groove 12 is formed on the moving contact piece 1 corresponding to the rivet 4. The moving contact piece 1 is rotated around the center of the insulating seat 2 by the cooperation of the rivet groove 12 and the rivet 4. A splicing groove 24 and a splicing block 25 are formed on the insulating base 21, and a splicing block and a splicing groove are formed correspondingly on the insulating upper cover 22. The insulating base 21 and the insulating upper cover 22 are positioned and spliced ​​by the cooperation between the splicing block 25 and the splicing groove 24. The insulating base 21 and the insulating upper cover 22 have the same structure, which can save mold costs. The special-shaped torsion spring 3 is connected between the moving contact piece 1 and the insulating seat 2. The special-shaped torsion spring 3 includes a middle end connecting portion 31, two torsion spring portions 32 connected to the two ends of the middle end connecting portion 31, and end connecting portions 33 respectively connected to the outer ends of the two torsion spring portions 32. A torsion spring middle end groove 13 is opened on the central axis inside the moving contact piece 1. A torsion spring groove 27 with the central axis hole 26 as the center is formed in the insulating base 21 and the insulating upper cover 22 of the insulating seat 2. The torsion spring portion 32 of the special-shaped torsion spring 3 is arranged in the torsion spring groove 27. The insulating base 21 and the insulating upper cover 22 are Two torsion spring end holes 28 are formed on the inner wall of the torsion spring groove 27. The middle end connecting portion 31 of the special-shaped torsion spring 3 is arranged in the torsion spring middle end groove 13 of the moving contact piece 1. The two end connecting portions 33 of the special-shaped torsion spring 3 are respectively inserted into the two torsion spring end holes 28. The two torsion spring portions 32 of the special-shaped torsion spring 3 are wound in opposite directions starting from the middle end connecting portion 31. The two torsion spring portions 32 of the special-shaped torsion spring 3 provide forces in opposite directions to drive the middle end connecting portion 31 to the middle position, thereby applying pressure to the moving contact piece 1 to maintain the middle position.

[0017] The above specific embodiments are preferred implementations of the present invention, but the protection scope of the present invention is not limited to the above specific embodiments. Other implementations that conform to the spirit of the claims are within the protection scope of the present invention.

Claims

1. A single-pole moving contact with bidirectional pressure, comprising a moving contact piece, an insulating seat, and a special-shaped torsion spring. The insulating seat has a central axis hole formed in the center, the moving contact piece is disposed within the insulating seat, and the two sides of the moving contact piece extend symmetrically from the insulating seat to form a moving contact point. The special-shaped torsion spring is connected between the moving contact piece and the insulating seat, and is characterized by: The special-shaped torsion spring includes a middle-end connecting part, two torsion spring parts connected at both ends of the middle-end connecting part, and end connecting parts respectively connected to the outer ends of the two torsion spring parts. A torsion spring middle-end groove is opened on the moving contact piece, and two torsion spring end holes are formed on the inner wall of the insulating seat. The middle-end connecting part of the special-shaped torsion spring is arranged in the torsion spring middle-end groove of the moving contact piece, and the two end connecting parts of the special-shaped torsion spring are respectively inserted into the two torsion spring end holes of the insulating seat. The two torsion spring parts of the special-shaped torsion spring provide forces in opposite directions to drive the middle-end connecting part to be in the middle position. The two torsion spring parts of the special-shaped torsion spring are wound in opposite directions starting from the middle-end connecting part.

2. The single-pole moving contact with bidirectional pressure according to claim 1, characterized in that: A contact slot is formed on the insulating seat, and the movable contact is arranged in the contact slot. Two rivets are arranged in the contact slot. An arc-shaped rivet slot is formed on the movable contact corresponding to the rivets. The movable contact rotates around the center of the insulating seat through the cooperation of the rivet slot and the rivet.

3. The single-pole moving contact with bidirectional pressure according to claim 1, characterized in that: A torsion spring groove centered at the central axis hole is formed in the insulating seat, and the torsion spring portion of the special-shaped torsion spring is arranged in the torsion spring groove.

4. The single-pole moving contact with bidirectional pressure according to claim 1, characterized in that: The insulating seat is composed of an insulating base and an insulating upper cover. A splicing groove and a splicing block are formed on the insulating base, and a splicing block and a splicing groove are correspondingly formed on the insulating upper cover. The insulating base and the insulating upper cover are positioned and spliced ​​by cooperating between the splicing block and the splicing groove.

Images