Switch isolation device of rail transit power supply system

Abstract

The utility model provides a switch isolation device of a rail transit power supply system, which relates to the technical field of rail transit power supply and comprises a support and a pair of supporting insulators, the supporting insulators are respectively inserted at two ends of the support, conductive frames are arranged on the supporting insulators, and a disconnecting link is arranged between the two conductive frames. A hinged shaft is hinged between one end of the disconnecting link and one conductive frame; the beneficial effects of the utility model lie in that in consideration of the problem of high heat influence of contact and a conductive structure when the existing isolating switch realizes opening and closing of manual operation and normal loop operation, the structure of the disconnecting link, the conductive frame, the contact and the wire holder which are combined in a segmented manner is adopted; the contact part is insulated and isolated from the movable structure of the disconnecting link, so that the stability of the whole conductive frame and the disconnecting link loop is ensured, and the influence of load current on the contact end of the contact is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit power supply, and particularly relates to a switch isolation device for a rail transit power supply system. Background Art

[0002] A disconnecting switch is a switch device mainly used for "isolating power sources, performing switching operations, and connecting and disconnecting small-current circuits" without arc extinguishing function. When the disconnecting switch is in the open position, there is an insulating distance that meets the specified requirements and an obvious disconnection mark between the contacts; when in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time.

[0003] For the switch isolation device used in the rail transit system, a double-column type is usually adopted as the break structure to achieve electrical insulation. In subsequent operation and maintenance work, due to the manual opening and closing operations using the knife switch structure, the contact part of the knife edge of the conductive frame structure often overheats due to the influence of load current. The actual opening and closing operations and overheating phenomenon are likely to affect the conductivity of the structure and limit the safe operation of the normal circuit. Summary of the Utility Model

[0004] In view of the above technical problems existing in the prior art, a switch isolation device for a rail transit power supply system is provided.

[0005] The purpose and effect of the utility model are achieved by the following specific technical means:

[0006] A switch isolation device for a rail transit power supply system includes a bracket and support insulators. A pair of support insulators are provided and are respectively inserted at both ends of the bracket. Conductive frames are provided on the support insulators, and a knife switch is arranged between the two conductive frames. A hinge shaft is hinged between one end of the knife switch and one of the conductive frames, and a matching contact is arranged between the other end of the knife switch and the other conductive frame. Wiring seats are arranged at the outer ends of the conductive frames;

[0007] An isolation seat is embedded in the middle of the bracket. A rotating handle seat and a crank plate member are arranged on the isolation seat. A connecting rod is connected between the crank plate member and the rotating handle seat, and both ends of the connecting rod are respectively rotatably connected to the crank plate member and the rotating handle seat. An extending rocker arm penetrates through the end of the crank plate member relative to the connecting rod to the outside. The rotating handle seat is hinged to the bracket, and a rotating rod is hinged between the rotating handle seat and the knife switch.

[0008] Furthermore, static contacts are fixed between both ends of the support insulator and the bracket and the conductive frame, and the static contacts are of a butt contact structure.

[0009] Further, an isolation cover is sleeved outside the contact point of the static contact, and the isolation cover is an insulating protective cover.

[0010] Further, the rotating rod and the connecting rod are rotationally matched through the rotating handle seat.

[0011] Further, the crank plate member is an L-shaped insulating plate member. An axle body extends laterally from the hinged end of the crank plate member and the axle body is slidably fitted with a curved rail, and the curved rail is fixed to the inner wall of the isolation seat.

[0012] Further, the extending rocker arm is a toothed shaft rod, and a remote switch rocker is sleeved outside the extending rocker arm.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] For this kind of switch isolation device for rail transit power supply system, considering the problem that when the existing disconnector realizes opening, closing of manual operation and normal loop operation, there are problems of high heat generation in the contact and conductive structure, a segmented combined knife switch, conductive frame, contact and wiring seat structure is adopted. The insulating isolation between the contact part and the movable structure of the knife switch can be used to ensure the stability of the entire conductive frame and knife switch loop, avoid the influence of load current on the contact end of the contact, and at the same time, the rotational opening and closing structure of the entire knife switch is restricted to two positions of opening and closing through the activities of the rotating handle seat and the crank plate member, ensuring the specification of the closing state and the contact depth, thereby improving the safety and reliability of the isolation device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the present utility model;

[0016] Figure 2 is the structural schematic diagram of the knife switch of the present utility model;

[0017] Figure 3 is the structural schematic diagram of the support insulator of the present utility model.

[0018] Markings in the figure: 1 - support; 2 - support insulator; 3 - isolation seat; 4 - conductive frame; 5 - knife switch; 6 - rotating handle seat; 7 - contact; 8 - wiring seat; 9 - crank plate member; 10 - rotating rod; 11 - curved rail; 12 - hinge shaft; 13 - connecting rod; 14 - extending rocker arm; 15 - isolation cover; 16 - static contact. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Please refer to Figures 1-3 , for further description of the embodiments of the present utility model;

[0020] A switch isolation device for a rail transit power supply system, comprising a bracket 1 and a support insulator 2. A pair of support insulators 2 are provided and are respectively inserted at both ends of the bracket 1. Conductive frames 4 are provided on both support insulators 2, and a knife switch 5 is arranged between the two conductive frames 4. A hinge shaft 12 is hingedly arranged between one end of the knife switch 5 and one of the conductive frames 4, and a matching contact 7 is arranged between the other end of the knife switch 5 and the other conductive frame 4. Wiring seats 8 are arranged at the outer ends of the conductive frames 4;

[0021] An isolation seat 3 is embedded in the middle of the bracket 1. A rotating handle seat 6 and a crank plate member 9 are arranged on the isolation seat 3. A connecting rod 13 is connected between the crank plate member 9 and the rotating handle seat 6, and both ends of the connecting rod 13 are respectively rotatably connected to the crank plate member 9 and the rotating handle seat 6. An extension rocker 14 penetrates outward from one end of the crank plate member 9 relative to the connecting rod 13. The rotating handle seat 6 is hinged to the bracket 1, and a rotating rod 10 is hingedly arranged between the rotating handle seat 6 and the knife switch 5.

[0022] The switch isolation device fixes the conductive frame 4 with the structures of the bracket 1 and the support insulator 2. Its structure is based on a double-column disconnector. The installation endpoints are set on the wiring seats 8 of the two end conductive frames 4, and the knife switch 5 is used as the opening break point of the conductive structure of the conductive frame 4. In the structure, the knife switch 5 is supported by the rotating rod 10, and the support height of the rotating rod 10 is determined by the rotation angle of the rotating handle seat 6. In the open state, the height of the rotating rod 10 is the highest and the knife switch 5 is supported to the position as shown in Figure 1 、 2 . In the closed state, the extension rocker 14 is used as the manual switch opening and closing structure extending outward from the crank plate member 9. The flipping of the crank plate member 9 with the midpoint of the extension rocker 14 will drive the connecting rod 13 to move downward in a curved shape, and the movement of the connecting rod 13 will drive the rotating handle seat 6 to rotate along the isolation seat 3. After rotating half a circle, the knife switch 5 will descend to the horizontal height of the conductive frame 4 along the hinge shaft 12 with the change of the height of the rotating rod 10. At this time, the contact 7 structure between the knife switch 5 and the conductive frame 4 is combined;

[0023] Compared with the traditional double-column disconnector, this device restricts the opening and closing positions of the knife switch 5 at the two extreme limit positions of the entire rotating structure of the connecting rod 13 through the structures of the rotating handle seat 6 and the crank plate member 9, so as to maintain the opening and closing of the switch at the standard position, that is, to ensure the contact depth and stability of the structures of the conductive frame 4, the knife switch 5 and the contact 7, and further maintain the current stability of the contact structure under the electrical circuit by separating and combining the conductive frame 4, the contact 7 and the wiring seat 8, and avoid the influence of the high temperature of the load current on the structure.

[0024] On the above basis, static contacts 16 are fixed between both ends of the support insulator 2 and the bracket 1 and the conductive frame 4. The static contacts 16 are of a butt-joint contact structure. Taking the static contacts 16 as the grounding endpoints of the conductive frame 4, the support insulator 2 and the bracket 1 ensures the safety of the entire main frame 1 and conductive frame 4 structure. The butt-joint contact structure is adopted to conform to the longitudinal butt-joint structure of the support insulator 2 with the main frame 1 and the conductive frame 4.

[0025] Preferably, an isolation cover 15 is sleeved outside the contact of the static contact 16. The isolation cover 15 is an insulating shield to enclose and isolate the connection endpoints of the static contact 16 with an insulating structure, further improving safety.

[0026] Preferably, the rotating rod 10 and the connecting rod 13 are rotationally matched through the rotating handle seat 6. With the coaxially butted rotating rod 10 and connecting rod 13, the linkage during the curved swing of the connecting rod 13 is improved, that is, the accuracy of the position of the connecting rod 13 and the height of the rotating rod 10 corresponding to the movement of the rotating handle seat 6 is improved.

[0027] Preferably, the crank plate member 9 is an L-shaped insulating plate member. The hinged end of the crank plate member 9 and the connecting rod 13 extends laterally with a shaft body, and a curved rail 11 is slidably fitted outside the shaft body. The curved rail 11 is fixed to the inner wall of the isolation seat 3. On the basis of the movement of the above-mentioned connecting rod 13 and the crank plate member 9, the curved rail 11 is used to limit the curved movement track of the shaft body to improve the movement accuracy of the crank plate member 9.

[0028] Preferably, the extension rocker arm 14 is a toothed shaft rod member, and a remote switch rocker is sleeved outside the extension rocker arm 14. The toothed shaft rod member can use the tooth end structure to connect to an external rocker, facilitating subsequent remote manual opening and closing operations.

[0029] The implementation mode of this device is that the knife switch 5 structures in the closed state between the two conductive frames 4 are conductively connected. Its conductive endpoints are realized based on the plug-in contact between the knife switch 5 and the contact 7. The wiring seat 8 arranged on the outside of the conductive frame 4 serves as the wiring end of the circuit cable. It is conducted from one end of the wiring seat 8 to the conductive frame 4, and then through the contact 7 and the knife switch 5 structure to the wiring seat 8 on the other conductive frame 4, forming the entire loop;

[0030] When opening the switch, the extension rocker arm 14 structure is operated by an external tool. By lifting the position of the extension rocker arm 14, the crank plate member 9 is forced to make a relative curved movement along the midpoint of the extension rocker arm 14, and at the same time, the connecting rod 13 is used to pull the rotating handle seat 6, so that the rotating handle seat 6 is hinged and moves along the isolation seat 3. By the hinged movement of the rotating handle seat 6, the rotating rod 10 is rotated and lifted, that is, the knife switch 5 is separated from one of the conductive frames 4.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A switch isolation device for a rail transit power supply system, characterized in that: It includes a support (1) and support insulators (2). A pair of the support insulators (2) are provided and are respectively inserted at both ends of the support (1). Conductive frames (4) are provided on the support insulators (2), and a knife switch (5) is arranged between the two conductive frames (4). A hinge shaft (12) is hingedly arranged between one end of the knife switch (5) and one of the conductive frames (4), and a matching contact (7) is arranged between the other end of the knife switch (5) and the other conductive frame (4). Wiring seats (8) are arranged at the outer ends of the conductive frames (4). An isolation seat (3) is embedded in the middle of the support (1). A handle seat (6) and a crank plate member (9) are arranged on the isolation seat (3). A connecting rod (13) is connected between the crank plate member (9) and the handle seat (6), and both ends of the connecting rod (13) are rotatably connected to the crank plate member (9) and the handle seat (6) respectively. An extension rocker arm (14) penetrates outward from one end of the crank plate member (9) relative to the connecting rod (13). The handle seat (6) is hinged to the support (1), and a rotating rod (10) is hingedly arranged between the handle seat (6) and the knife switch (5).

2. The switch isolation device for a rail transit power supply system according to claim 1, wherein: Static contacts (16) are fixed between the two ends of the support insulator (2) and the support (1) and the conductive frame (4). The static contact (16) is a butt contact structure.

3. The switch isolation device for a rail transit power supply system according to claim 2, characterized in that: An isolation cover (15) is sleeved outside the contact of the static contact (16). The isolation cover (15) is an insulating cover.

4. The switch isolation device for a rail transit power supply system according to claim 1, characterized in that: The rotating rod (10) and the connecting rod (13) are rotationally matched through the handle seat (6).

5. A switching isolation device for a rail transit power supply system according to claim 1, characterized in that: The crank plate member (9) is an L-shaped insulating plate member. A shaft body extends laterally from the hinged end of the crank plate member (9) and the connecting rod (13), and a curved rail (11) is slidably fitted outside the shaft body. The curved rail (11) is fixed to the inner wall of the isolation seat (3).

6. The switch isolation device for a rail transit power supply system according to claim 1, wherein: The extension rocker arm (14) is a toothed shaft rod member, and a remote switch rocker is sleeved outside the extension rocker arm (14).

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