A novel horizontal oil-immersed maintenance-free contact assembly

Abstract

This utility model discloses a novel horizontal oil-immersed maintenance-free contact assembly. It includes a contact assembly support, comprising a support housing with an opening on one side and an inner cavity, and an end cap disposed at the opening of the support housing. The support housing has six pairs of stationary contact blocks with terminals arranged vertically in two rows. The support housing and the stationary contact blocks are integrally molded using an injection molding process. A main shaft is mounted in the inner cavity of the support housing via bearings, and the main shaft has multiple moving contact blocks that can contact the stationary contact blocks. The advantages are: the stationary contact blocks are arranged in two rows of six pairs vertically, which shortens the axial length of the contact assembly, making the structure more compact and suitable for switch machines with more limited internal space; the moving contact blocks are designed with an inner and outer nested structure supported by double-layer springs, which maintains pressure on the wall of the stationary contact blocks at all times, while greatly increasing the contact redundancy of the contacts, making the performance of the contact assembly more stable and reliable.

Description

Technical Field

[0001] This utility model relates to a switch machine contact group in railway track equipment, specifically a new type of horizontal oil-immersed maintenance-free contact group. Background Technology

[0002] A switch machine is a piece of equipment in railway tracks used to switch and lock turnouts, and to indicate the position of the turnout switch rails. The contact group, as a key component for achieving circuit switching, mainly consists of moving contacts and stationary contacts, controlling the circuit through contact or separation. Existing Siemens switch machines primarily use arranged contact groups and TS-1 series contact groups; however, these require regular on-track maintenance and cleaning. While horizontal oil-immersed maintenance-free contact groups also exist, their contacts are typically arranged in three rows of six groups, occupying a large volume and unsuitable for switch machines with limited internal space. Furthermore, the moving contacts in existing contact groups usually reciprocate in the upper half of the contact group's internal cavity. Considering thermal expansion and contraction, the insulating oil is generally not filled completely. Combined with the long-term operation of the contact group causing some wear on the insulating oil, this can lead to insufficient arc extinguishing and stationary contact block erosion when the contacts disconnect due to contact with air, thus affecting service life. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a new type of horizontal oil-immersed maintenance-free contact assembly that is highly reliable, compact in structure, can be maintained for a long time without maintenance, and has a long service life.

[0004] To solve the above-mentioned technical problems, this utility model provides a novel horizontal oil-immersed maintenance-free contact assembly, including a contact assembly support. The contact assembly support includes a support housing with an opening on one side and an inner cavity, and an end cap disposed at the opening of the support housing. The support housing has six pairs of stationary contact blocks with wiring terminals arranged vertically in two rows. The support housing and the stationary contact blocks are integrally molded by injection molding. A main shaft is mounted in the inner cavity of the support housing via bearings, and the main shaft is provided with multiple moving contact blocks that can contact the stationary contact blocks.

[0005] The moving contact block includes an inner moving contact block and an outer moving contact block with a nested structure. The top surfaces of the inner moving contact block and the outer moving contact block together form a conductive contact surface with the stationary contact block. The bottom is supported by an inner contact spring and an outer contact spring coaxially mounted on the main shaft, respectively.

[0006] The spindle is provided with a spindle housing that matches the shape of the inner cavity of the contact group support. The spindle housing has multiple moving contact block mounting holes. The moving contact block, the inner contact spring, and the outer contact spring are disposed in the moving contact block mounting holes.

[0007] A spring pad with a stepped surface is provided in the mounting hole of the moving contact block. The inner contact spring and the outer contact spring are respectively fitted on the two steps of the spring pad. The bottom of the nested inner moving contact block and the outer moving contact block are set with the same two steps, and are set at the other end of the inner contact spring and the outer contact spring.

[0008] The spindle housing has a dovetail groove, and the moving contact block mounting hole is located in the dovetail groove, with a copper sleeve inside. After the moving contact block passes through the copper sleeve and is installed in the moving contact block mounting hole, a cover plate is inserted into the dovetail groove. The cover plate has a through hole for the moving contact block to extend out. The cover plate and the spindle housing have continuous limiting ring grooves, and an insulating retaining ring is installed in the limiting ring groove.

[0009] The spindle and the spindle housing are integrally formed by injection molding.

[0010] The support housing and the end cover are respectively provided with bearing mounting holes for the support housing and bearing mounting holes for the end cover. The bearings at both ends of the main shaft are respectively installed in the bearing mounting holes for the support housing and bearing mounting holes for the end cover.

[0011] The spindle end is provided with a pointer for indicating the contact connection status, and the support housing is provided with a marking groove corresponding to the pointer.

[0012] Insulating oil is injected into the inner cavity of the support housing; a skeleton oil seal is provided at the connection between the support housing and the main shaft; a sealing ring is provided at the connection between the support housing and the end cover; and a waterproof and breathable valve is provided on the top of the support housing.

[0013] The bottom of the inner cavity of the support housing has a storage groove for accumulating foreign objects generated during operation.

[0014] The advantages of this utility model are: (1) The stationary contact blocks are arranged in two rows of six pairs on the support housing. Compared with the traditional arrangement of three rows of six pairs, this design can shorten the axial length of the contact group and make the structure more compact, thus adapting to the switch machine with a more compact internal space. (2) The moving contact block is designed as an inner and outer nested structure supported by double springs, which can always maintain pressure on the wall of the stationary contact block under the action of the spring. At the same time, the double moving contact block double insurance design can greatly increase the contact redundancy of the contact, making the performance of the contact group more stable and reliable. (3) The support housing and the stationary contact block are integrally formed by injection molding. At the same time, the steel spindle and the spindle housing are also integrally formed by injection molding. The upper parts are enclosed in the inner cavity of the support housing. Compared with the traditional open-design arrangement of contact groups, this design can better ensure the sealing of the equipment and avoid the influence of the external environment on it. (4) The contact surfaces of the moving contact block and the stationary contact block are designed to match the arc shape. Compared with the traditional contact mode of contact plate and contact ring, this design changes the line contact to the surface contact and the shear friction to the sliding friction. Under the action of the oil medium, it can significantly reduce the friction resistance and wear of the contact surface while ensuring effective contact and conduction, thereby improving the service life of the equipment. (5) The arc-shaped structure of the moving contact block can also play a turbulence role, causing the insulating oil in the inner cavity of the support housing to generate eddies, cleaning the impurities on the contact surface to a certain extent, and causing them to fall into the accumulation groove at the bottom of the inner cavity of the support housing, thereby achieving a long-term maintenance-free effect. (6) In traditional contact groups, the moving contact block usually reciprocates in the upper half of the contact group cavity. Due to thermal expansion and contraction and long-term operating losses, it is generally not filled with insulating oil, which can easily lead to insufficient arc extinguishing due to contact with air when the contacts are disconnected, and erosion of the stationary contact block. In this design, the moving contact block is set between the upper and lower stationary contact blocks and between the lower stationary contact blocks, so that the range of motion of the moving contact block is adjusted downward, which effectively avoids the above-mentioned phenomena and greatly improves the service life. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 AA cross-section view; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 for Figure 2 BB cross-section; Figure 6 Exploded view of the spindle and spindle housing; Figure 7 This is a frontal three-dimensional view of the support shell; Figure 8 This is a three-dimensional view of the support shell from the rear. Detailed Implementation

[0016] The novel horizontal oil-immersed maintenance-free contact assembly of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] As shown in the figure, the novel horizontal oil-immersed maintenance-free contact assembly of this utility model includes a contact assembly support 1 and a rotating component installed therein. The contact assembly support 1 is composed of a support housing 19 with an opening on one side and a cylindrical inner cavity, and an end cap 20 disposed at the opening of the support housing 19. The support housing 19, the locking copper nut 21 for installing the end cap 20, and the stationary contact block 5 as a conductor are integrally formed by injection molding. The end cap 20, which is equipped with a sealing ring 24, is first positioned by a positioning pin, and then fixed by screwing a locking bolt with a self-locking washer into the locking copper nut 21. There are six pairs of stationary contact blocks 5, totaling twelve, distributed in the middle and upper parts of the support housing 19, with contact surfaces exposed in their inner cavities. There are three pairs on each of the left and right sides, specifically two pairs on the upper part and one pair on the lower part of each side. The stationary contact blocks 5 on the lower parts of both sides are staggered. Terminals 4 for wiring are fixed on the stationary contact blocks 5 outside the support housing 19. The contact surfaces inside the support housing 19 form a smooth curved surface with the inner cavity. An oil injection hole for injecting insulating oil into the inner cavity is opened at the top of the support housing 19, and a waterproof and ventilated valve 27 is installed at the top of the oil injection hole. The insulating oil can extinguish arcs during equipment operation, thereby reducing the impact of electro-corrosion.

[0018] The rotating component consists of a steel spindle 3 and a spindle housing 11 integrally molded by injection molding. The shape of the spindle housing 11 matches the shape of the inner cavity of the support housing 19. The support housing 19 has a support housing bearing mounting hole 28 in the middle of its closed side, and an end cover bearing mounting hole 22 in the middle of the inner side of the end cover 20. The spindle 3 is installed in the contact assembly support 1 by having its two end bearings 2 respectively inserted into the support housing bearing mounting hole 28 and the end cover bearing mounting hole 22. The spindle housing 11 then enters the cylindrical inner cavity of the support housing 19. A skeleton oil seal 23 is pre-installed between the bearing 2 on the support housing bearing mounting hole 28 side and the support housing 19, and a wave spring for compensating for axial clearance is pre-installed between the bearing 2 on the end cover bearing mounting hole 22 side and the spindle housing 11, thereby strengthening the tightness and sealing of the rotating component and the end cover 20 after installation.

[0019] The spindle housing 11 has three dovetail grooves 15, two large and one small. The two small dovetail grooves 15 are symmetrically arranged between the upper and lower stationary contact blocks 5 on both sides of the support housing 19, while the large dovetail groove 15 is arranged between the lower stationary contact blocks 5 on both sides of the support housing 19. Each dovetail groove 15 has two moving contact block mounting holes 12. First, a copper sleeve 14 is installed around its edge to prevent the moving contact block 6 from impacting the edge and deforming it during movement. Then, a spring pad 13 with a two-stage stepped surface is installed at its bottom. The inner contact spring 7 and the outer contact spring 8 are sequentially mounted on the two-stage stepped surface. The double springs are then inserted into the top. The moving contact block 6 consists of an inner moving contact block 9 and an outer moving contact block 10, which are nested in an inner and outer layer. The outer moving contact block 10 has a through hole in its center for the inner moving contact block 9 to be inserted. The upper parts of both the inner and outer moving contact blocks 9 and 10 are U-shaped, with an arc-shaped protrusion at the top forming a conductive contact surface with the stationary contact block 5. This contact surface is an arc shape that matches the wall surface of the stationary contact block 5. Compared to the traditional contact mode using a contact plate and a contact ring, this design changes the line contact to a self-correcting arc surface contact and changes shear friction to sliding friction, which better ensures effective contact fit and conduction, while significantly reducing frictional resistance and wear on the contact surface. The bottom of the nested moving contact block 6 has a two-step surface similar in shape to the spring pad block 13, which is used to engage with the double-layer springs, allowing the inner moving contact block 9 to be independently supported by the inner contact spring 7, and the outer moving contact block 10 to be independently supported by the outer contact spring 8. After the moving contact block 6 is installed, it is pressed down and the cover plate 16 with a through hole matching its position is inserted into the dovetail groove 15, so that the moving contact block 6 extends out of the through hole, thereby preventing it from falling off. The installed cover plate 16 and the spindle housing 11 have a continuous limiting ring groove 17, in which an insulating retaining ring 18 is provided to prevent the cover plate 16 from falling off.

[0020] Each moving contact block mounting hole 12 is located axially between the two nearest stationary contact blocks 5 on the main shaft 3, so that the contact of the moving contact block 6 installed therein can simultaneously contact the two stationary contact blocks 5 as the main shaft 3 rotates, and at any given time only the moving contact block 6 on the same side can maintain contact with the stationary contact block 5, that is, this contact group has three connection states: ① The moving contact block 6 in the small dovetail groove 15 on the left side is in contact with the upper stationary contact block 5 on the left side, the moving contact block 6 in the small dovetail groove 15 on the right side is not in contact with the stationary contact block 5, and the moving contact block 6 on the left side in the large dovetail groove 15 is in contact with the lower stationary contact block 5 on the left side. ②The moving contact block 6 on both the left and right sides does not contact the stationary contact block 5; ③ The moving contact block 6 in the small dovetail groove 15 on the left side does not contact the stationary contact block 5, the moving contact block 6 in the small dovetail groove 15 on the right side contacts the upper stationary contact block 5 on the right side, and the moving contact block 6 in the large dovetail groove 15 on the right side contacts the lower stationary contact block 5 on the right side.

[0021] A pointer (not shown in the figure) is provided at the end of the main shaft 3. Three marking slots 26 corresponding to the pointer are opened on the support housing 19 to indicate the three connection states of the contact group. Under the action of the inner contact spring 7 and the outer contact spring 8, the moving contact block 6 can always maintain pressure on the wall of the stationary contact block 5. At the same time, since the inner moving contact block 9 and the outer moving contact block 10 are supported by the inner contact spring 7 and the outer contact spring 8 respectively, the double moving contact block double insurance design can greatly increase the contact redundancy of the contacts, making the performance of the contact group more stable and reliable. During operation, the arc-shaped structure of the moving contact block can also play a turbulence role, causing the insulating oil in the inner cavity of the support housing 19 to generate a vortex, which cleans the impurities on the contact surface to a certain extent, thereby achieving a long-term maintenance-free effect. For this purpose, an accumulation groove 25 is also opened at the bottom of the inner cavity of the support housing 19 to accumulate impurities generated during operation.

[0022] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A novel horizontal oil-immersed maintenance-free contact assembly, characterized in that: The device includes a contact assembly support (1), which includes a support housing (19) with an opening on one side and an inner cavity, and an end cap (20) disposed at the opening of the support housing (19). The support housing (19) is provided with six pairs of stationary contact blocks (5) with terminals (4) arranged in two rows. The support housing (19) and the stationary contact blocks (5) are integrally formed by injection molding. A spindle (3) is installed in the inner cavity of the support housing (19) through a bearing (2). The spindle (3) is provided with multiple moving contact blocks (6) that can contact the stationary contact blocks (5).

2. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 1, characterized in that: The moving contact block (6) includes an inner moving contact block (9) and an outer moving contact block (10) with a nested structure. The top surfaces of the inner moving contact block (9) and the outer moving contact block (10) together form a conductive contact surface with the stationary contact block (5). The bottom is supported by an inner contact spring (7) and an outer contact spring (8) coaxially arranged on the main shaft (3).

3. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 2, characterized in that: The spindle (3) is provided with a spindle housing (11) that matches the shape of the inner cavity of the contact group support (1). The spindle housing (11) has multiple moving contact block mounting holes (12). The moving contact block (6), the inner contact spring (7) and the outer contact spring (8) are located in the moving contact block mounting holes (12).

4. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 3, characterized in that: A spring pad (13) with a stepped surface is provided in the mounting hole (12) of the moving contact block. The inner contact spring (7) and the outer contact spring (8) are respectively fitted on the two steps of the spring pad (13). The bottom of the nested inner moving contact block (9) and the outer moving contact block (10) are set with the same two steps, and are set at the other end of the inner contact spring (7) and the outer contact spring (8).

5. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 3, characterized in that: The spindle housing (11) has a dovetail groove (15), and the moving contact block mounting hole (12) is opened in the dovetail groove (15), and a copper sleeve (14) is provided inside it; after the moving contact block (6) passes through the copper sleeve (14) and is set in the moving contact block mounting hole (12), a cover plate (16) is inserted into the dovetail groove (15), and a through hole for the moving contact block (6) to extend is opened on the cover plate (16); a continuous limiting ring groove (17) is opened on the cover plate (16) and the spindle housing (11), and an insulating retaining ring (18) is provided in the limiting ring groove (17).

6. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 3, characterized in that: The spindle (3) and the spindle housing (11) are integrally formed by injection molding.

7. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 1, characterized in that: The support housing (19) and the end cover (20) are respectively provided with a support housing bearing mounting hole (28) and an end cover bearing mounting hole (22). The bearings (2) at both ends of the main shaft (3) are respectively provided in the support housing bearing mounting hole (28) and the end cover bearing mounting hole (22).

8. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 1, characterized in that: The end of the main shaft (3) is provided with a pointer for indicating the contact connection status, and the support housing (19) is provided with a marking groove (26) corresponding to the pointer.

9. The novel horizontal oil-immersed maintenance-free contact assembly according to claim 1, characterized in that: Insulating oil is injected into the inner cavity of the support housing (19); a skeleton oil seal (23) is provided at the connection between the support housing (19) and the main shaft (3); a sealing ring (24) is provided at the connection between the support housing (19) and the end cover (20); a waterproof and breathable valve (27) is provided on the top of the support housing (19).

10. The novel horizontal oil-immersed maintenance-free contact assembly according to any one of claims 1-9, characterized in that: The bottom of the inner cavity of the support housing (19) has a storage groove (25) for accumulating foreign objects generated during operation.

Images