Moving contact device for tap changer

Abstract

The present invention discloses a moving contact device for a tap changer, which comprises a U-shaped housing, a positioning spring piece and a moving contact piece. The positioning spring piece is integrally formed by stamping a metal sheet, and it includes two clamping piece parts and a connecting piece part. The connecting piece part is connected to the U-shaped housing. Each clamping piece part has two elastic pressing parts extending away from the connecting piece part. One end of each elastic pressing part away from the connecting piece part is a positioning part. The two moving contact pieces are arranged between the two clamping piece parts, and positioning grooves are formed at positions corresponding to the positioning parts on the outer side surfaces of the moving contact pieces. The positioning parts are clamped in the positioning grooves. A convex part is provided in the middle of the moving contact piece, and bending parts are provided at both ends of the moving contact piece. In the normal state, the convex parts in the middle of the two moving contact pieces抵触 each other under the elastic force applied by the elastic pressing parts, and a gap for the static contact to slide into is formed between the two bending parts at the same end of the two moving contact pieces. The number of components of the moving contact device in the present invention is relatively small, and the product structure is simplified.

Description

Technical Field

[0001] The present invention relates to a moving contact device for a tap changer, belonging to the field of tap changer structure design. Background Art

[0002] Patent document CN203367035U discloses a contact device for an on-load tap changer. The device includes: a cap, a spring, a pin, an upper moving contact, a static contact, a bushing, an upper traction member, a lower moving contact, and a lower traction member; the entire contact device has an upper and lower symmetric structure. The cap and the spring are sleeved on the pin. The number of pins is 4, and each pin has a corresponding cap and spring, which are respectively fixed at corresponding positions of the upper moving contact and the lower moving contact; the static contact is located between the upper moving contact and the lower moving contact, and the upper moving contact and the lower moving contact are respectively fixed on the bushing; the upper traction member and the lower traction member are respectively sleeved on the outer surfaces of the corresponding caps; arcs are provided on both the upper moving contact and the upper moving contact. The problems of the above contact device are that the number of components constituting the above contact device is relatively large and the structure is relatively complex. Therefore, the structure of the above contact device still needs to be improved. Summary of the Invention

[0003] In view of this, the present invention aims to provide a moving contact device for a tap changer with a relatively simplified structure.

[0004] The technical solution for achieving the purpose of the present invention is:

[0005] A moving contact device for a tap changer includes a U-shaped housing, a positioning spring piece provided in the U-shaped housing, and two oppositely arranged moving contact pieces. The positioning spring piece is integrally formed by stamping a metal sheet, and includes two oppositely arranged clamping piece parts and a connecting piece part connecting the two clamping piece parts. The connecting piece part is connected to the U-shaped housing. Each clamping piece part has two elastic pressing parts extending away from the connecting piece part. One end of each elastic pressing part away from the connecting piece part has an inwardly bent positioning part. The two moving contact pieces are arranged between the two clamping piece parts, and positioning grooves are formed at positions corresponding to the positioning parts on the outer side surfaces of the moving contact pieces. The positioning parts are clamped in the positioning grooves. A convex part protruding inward is provided in the middle of the moving contact piece, and the two ends of the moving contact piece have bent parts bent outward. In the normal state, under the elastic force applied by the elastic pressing parts, the convex parts in the middle of the two moving contact pieces are in contact with each other, and a gap for the static contact to slide into is formed between the two bent parts at the same end of the two moving contact pieces.

[0006] In the above technical solution, one end of the moving contact piece close to the connecting piece part abuts against a resisting boss in the U-shaped housing.

[0007] In the above technical solution, both sides of one end of the movable contact piece close to the connecting piece part are provided with protruding positioning bosses, and on the inner wall of the U-shaped housing, there are resisting steps that cooperate with the positioning bosses to position the movable contact.

[0008] In the above technical solution, a strip-shaped groove is formed on the outside of the U-shaped housing, and positioning columns are formed in the strip-shaped groove.

[0009] In the above technical solution, the number of the positioning columns is at least two, and they are arranged at intervals along the length direction of the strip-shaped groove.

[0010] The present invention has positive effects: In the movable contact device of the present invention, through the cooperation of each positioning groove and the positioning part by clamping, it can play a limiting role on the upper and lower pairs of movable contact pieces. The elastic pressing part provides an elastic acting force in the opposite direction for the two movable contacts, eliminating the need to additionally set a spring, with relatively fewer components, simplifying the product structure, and having a very good use effect. Description of the Drawings

[0011] Figure 1 is a schematic perspective view of the movable contact device in the present invention;

[0012] Figure 2 is a schematic view from another angle Figure 1 of the shown movable contact device;

[0013] Figure 3 is Figure 1 a front view of the shown movable contact device;

[0014] Figure 4 is a sectional view taken along the line A-A in Figure 3 ;

[0015] Figure 5 is a schematic front view of the positioning elastic piece and the movable contact piece in cooperation in the present invention;

[0016] Figure 6 is Figure 5 a perspective view of the positioning elastic piece and the movable contact piece in cooperation as shown;

[0017] Figure 7 is a schematic perspective view of the positioning elastic piece in the present invention.

[0018] The reference numerals shown in the figures are: 1 - U-shaped housing; 11 - resisting boss; 12 - strip-shaped groove; 13 - positioning column; 14 - resisting step; 2 - positioning elastic piece; 21 - clamping piece part; 22 - connecting piece part; 23 - elastic pressing part; 24 - positioning part; 3 - movable contact piece; 31 - positioning groove; 32 - protruding part; 33 - bending part; 34 - positioning boss; 4 - gap. Detailed Embodiments

[0019] The specific structure in the present invention will be described below in conjunction with the accompanying drawings of the specification:

[0020] A moving contact device for a tap-changer, as shown in the figure, which includes a U-shaped housing 1, a positioning spring piece 2 disposed within the U-shaped housing 1, and two oppositely arranged moving contact pieces 3. The positioning spring piece 2 is integrally formed by stamping a metal sheet, and it includes two oppositely arranged clamping piece portions 21 and a connecting piece portion 22 connecting the two clamping piece portions 21. The connecting piece portion 22 is connected to the U-shaped housing 1. Each clamping piece portion 21 has two elastic pressing portions 23 extending away from the connecting piece portion 22. One end of each elastic pressing portion 23 away from the connecting piece portion 22 has a positioning portion 24 formed by bending inward. The two moving contact pieces 3 are disposed between the two clamping piece portions 21, and positioning grooves 31 are formed at positions corresponding to the positioning portions 24 on the outer side surfaces of the moving contact pieces 3. The positioning portion 24 is clamped within the positioning groove 31. The middle portion of the moving contact piece 3 has a convex portion 32 protruding inward, and the two end portions of the moving contact piece 3 have bent portions 33 bent outward. In the normal state, under the elastic force applied by the elastic pressing portions 23, the convex portions 32 in the middle of the two moving contact pieces 3 are in contact with each other, and a gap 4 for the static contact to slide into is formed between the two bent portions 33 at the same end of the two moving contact pieces 3. In the moving contact device of the present invention, the upper and lower pairs of moving contact pieces 3 can be limited by the cooperation of the positioning grooves 31 and the positioning portions 24 being clamped. The elastic pressing portions 23 provide an elastic force acting towards each other for the two moving contacts, eliminating the need to separately provide a spring, with a relatively small number of components, simplifying the product structure and having a good usage effect. During the actual installation and use process, when the moving contact moves, the static contact enters between the two moving contact pieces 3 from the gap 4, and is clamped by the elastic pressing portions 23 on the upper and lower sides of the two moving contact pieces 3 to achieve the electrical connection between the moving contact and the static contact piece. The static contact is a cylindrical structure. The connecting piece portion 22 is connected to the U-shaped housing 1 by clamping or by screws.

[0021] In this embodiment, one end of the moving contact piece 3 close to the connecting piece portion 22 abuts against a resisting boss 11 within the U-shaped housing 1, which can further resist the moving contact piece 3 and prevent it from moving when subjected to an external force.

[0022] As a further improvement of the above embodiment, two protruding positioning bosses 34 are provided on both sides of one end of the moving contact piece 3 close to the connecting piece portion 22, and a resisting step 14 for positioning the moving contact piece 3 in cooperation with the positioning bosses 34 is provided on the inner wall of the U-shaped housing 1. Specifically, the side of the positioning boss 34 facing away from the connecting piece portion 22 abuts against the resisting step 14, thereby preventing the moving contact piece 3 from slipping out of the positioning spring piece 2 when subjected to an external force.

[0023] In this embodiment, a strip-shaped groove 12 is formed on the outer surface of the U-shaped housing 1, and a positioning post 13 is formed in the strip-shaped groove 12. When installing the moving contact device, the installation rod is placed in the strip-shaped groove 12, and the positioning post 13 is inserted into the insertion hole of the installation rod. Then, the end of the positioning post 13 is melted and extruded to form a stop head with a diameter larger than that of the positioning post 13 and larger than the aperture of the insertion hole. The stop head plays a role of resisting and limiting to prevent the U-shaped housing 1 from falling off the installation rod.

[0024] In this embodiment, the number of the positioning posts 13 is at least two, and they are arranged at intervals along the length direction of the strip-shaped groove 12.

[0025] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And these obvious changes or variations derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A moving contact device for a tap switch, characterized in that: It includes a U-shaped housing (1), a positioning elastic piece (2) disposed within the U-shaped housing (1), and two oppositely arranged moving contact pieces (3). The positioning elastic piece (2) is integrally formed by stamping a metal sheet, and it includes two oppositely arranged clamping piece portions (21) and a connecting piece portion (22) connecting the two clamping piece portions (21). The connecting piece portion (22) is connected to the U-shaped housing (1). Each clamping piece portion (21) has two elastic pressing portions (23) extending away from the connecting piece portion (22). One end of each elastic pressing portion (23) away from the connecting piece portion (22) has a positioning portion (24) formed by bending inward. The two moving contact pieces (3) are disposed between the two clamping piece portions (21), and a positioning groove (31) is formed at a position corresponding to each positioning portion (24) on the outer side surface of each moving contact piece (3). The positioning portion (24) is clamped in the positioning groove (31). The middle part of the moving contact piece (3) has a protruding portion (32) protruding inward, and the two end portions of the moving contact piece (3) have bent portions (33) bent outward. In the normal state, under the elastic force applied by the elastic pressing portions (23), the protruding portions (32) in the middle of the two moving contact pieces (3) are in contact with each other, and a gap (4) for the static contact to slide into is formed between the two bent portions (33) at the same end of the two moving contact pieces (3). One end of the moving contact piece (3) close to the connecting piece portion (22) abuts against a resisting boss (11) within the U-shaped housing (1). Both sides of one end of the moving contact piece (3) close to the connecting piece portion (22) have protruding positioning bosses (34), and on the inner wall of the U-shaped housing (1), there are resisting steps (14) that cooperate with the positioning bosses (34) to position the moving contact piece (3). A strip-shaped groove (12) is formed on the outside of the U-shaped housing (1), and a positioning post (13) is formed within the strip-shaped groove (12).

2. The moving contact device for a tap changer according to claim 1, characterized in that: The number of the positioning posts (13) is at least two, and they are arranged at intervals along the length direction of the strip-shaped groove (12).

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