CN112951523B

CN112951523B - Insulator

Info

Publication number: CN112951523B
Application number: CN202110072118.5A
Authority: CN
Inventors: 杨燕花; 陈珍宝; 林平; 李涛; 李通
Original assignee: CRRC Zhuzhou Locomotive Co Ltd
Current assignee: CRRC Zhuzhou Locomotive Co Ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2023-09-05
Anticipated expiration: 2041-01-19
Also published as: CN112951523A

Abstract

The invention discloses an insulator, and relates to the field of high-voltage cable accessories. The invention comprises a body, wherein two ends of the body are respectively connected with a first connecting piece and a second connecting piece. One end of the high-voltage cable penetrates through the first connecting piece and stretches into the inner cavity of the body. The inner cavity is communicated with the air charging device, and a fixed contact is arranged at the end part of the high-voltage cable extending into the inner cavity. And the second connecting piece is provided with a moving contact. In the initial state, the moving contact is connected with the fixed contact. When the inflation device inflates the inner cavity, the moving contact is separated from the fixed contact. When the high-voltage main circuit or the electric equipment on the main circuit has emergency faults, the load-bearing separation main circuit can transmit separation signals to the locomotive, the arc is extinguished while the high-current fault is rapidly cut off, the faults are immediately cut off, operators are informed that the faults are cut off, and the personal safety of the operators on the locomotive is ensured.

Description

Insulator

Technical Field

The invention relates to a high-voltage cable accessory, in particular to an insulator.

Background

The high-voltage cable terminal is an accessory of a high-voltage cable and is mainly used for connecting the 25kV high-voltage cable with network-side high-voltage equipment in a 25kV network-side high-voltage main circuit of a locomotive/motor train unit. At present, a high-voltage cable terminal applied to a locomotive or a high-speed motor train unit cannot realize separation under the electrified condition because the high-voltage cable terminal does not have an arc extinguishing function, and when a high-voltage main circuit or electric equipment on the main circuit breaks down, the high-voltage cable terminal cannot be immediately cut off, so that a large current fault can be caused, and other electric equipment on the main circuit is endangered, so that larger loss is caused.

Disclosure of Invention

The invention aims to solve the technical problems that aiming at the defects of the prior art, an insulator is provided for solving the problems that a vehicle-mounted high-voltage cable terminal in the prior art cannot be separated under the condition of electrification and a separation signal cannot be transmitted to a locomotive.

In order to solve the technical problems, the invention adopts the following technical scheme:

an insulator, comprising a body; the two ends of the body are respectively connected with the first connecting piece and the second connecting piece; one end of the high-voltage cable penetrates through the first connecting piece and stretches into the inner cavity of the body. The inner cavity is communicated with the air charging device, a fixed contact is arranged at the end part of the high-voltage cable extending into the inner cavity, and a moving contact is arranged on the second connecting piece. In the initial state, the moving contact is connected with the fixed contact. When the inflation device inflates the inner cavity, the moving contact is separated from the fixed contact.

In the above scheme, the main body, the first connecting piece, the second connecting piece, the high-voltage cable, the fixed contact and the moving contact form a closed inner cavity. In the initial state, the fixed contact is electrically connected with the movable contact. When the air charging device charges the inner cavity, the moving contact moves away from the fixed contact under the action of air flow, so that the moving contact is separated from the fixed contact, and the air flow cools an electric arc generated when the moving contact and the fixed contact are separated, so that the electric arc is forced to be extinguished when the current crosses zero.

Specifically, the air charging device comprises an air cylinder, an electromagnetic valve and an air pipe; one end of the electromagnetic valve is connected with the air cylinder, the other end of the electromagnetic valve is connected with one end of the air pipe, and the other end of the air pipe is connected with the inner cavity in a penetrating way through the first connecting piece. The electromagnetic valve can control the on-off of the air passage.

Further, the compressed gas pressure in the cylinder is higher than 700kpa. The compressed gas forms a high-speed air flow at the nozzles of the moving contact and the fixed contact, so that the electric arc generated when the moving contact and the fixed contact are separated is strongly blown and cooled, and the electric arc is forced to be extinguished when the current crosses zero. After the arc is extinguished, the arc gap is rapidly filled with fresh compressed gas, so that the insulation medium between the fracture is rapidly recovered, and the heavy breakdown can be avoided.

Further, the solenoid valve is electrically connected with a control system on the locomotive. The electromagnetic valve can transmit the power-off electric signal to the rolling stock through the control system, and after the rolling stock receives the signal, a worker can detach the first connecting piece to separate the rolling stock circuit from the high-voltage main circuit.

Further, a limiting piece for preventing the moving contact from being separated from the main body is arranged on the inner side of the second connecting piece. The limiting piece can prevent the moving contact from being excessively displaced to be separated from the inner cavity of the body when the moving contact is separated from the fixed contact, so that the moving contact is convenient to reset.

Further, one end of the moving contact far away from the fixed contact is fixedly connected with a moving contact seat, one end of the moving contact seat close to the limiting piece is fixedly connected with one end of an elastic piece, and the other end of the elastic piece is in contact with the limiting piece; the side edge of the movable contact seat is lapped on the first boss at the inner side of the second connecting piece. The elastic piece can be compressed by the moving contact when the moving contact is separated from the fixed contact, and provides restoring power for the moving contact.

Further, a buffer device is arranged between the limiting piece and the first boss. The buffer device can buffer impact force at the later stage of the motion of the movable contact, prevent the movable contact seat from being in direct contact with the limiting piece to damage the limiting piece, prevent the impact force of the movable contact seat from causing the loosening of the limiting piece, and ensure stable structure.

Further, one side of the buffer device is connected with the limiting piece, and the other side of the buffer device is clamped on the second boss on the inner side of the second connecting piece. The buffer device can be used as a limiting device for the maximum displacement of the moving contact seat in the moving contact motion.

Further, a reed is fixedly arranged on the lower surface of the first boss, and the reed is sleeved on the outer surface of the movable contact. The spring has certain clamping force, can provide guiding effect for the movable contact to compress the elastic piece, ensures that the movable contact moves in the axial direction of the body, and is convenient for resetting the movable contact.

Further, the second connecting piece is arranged in the outer cover, and the outer cover is electrically connected with electrical equipment on the locomotive. The housing is capable of transmitting high voltage power to electrical equipment on the locomotive and provides a waterproof, dust-proof protective function for the second connector.

Compared with the prior art, the invention has the following beneficial effects: when the high-voltage main circuit or the electric equipment on the main circuit has emergency faults, the device can separate the main circuit under the electrified condition, rapidly cut off the fault heavy current and quench the arc at the same time, immediately cut off the fault and limit the loss to the minimum. And the separation signal is transmitted to the locomotive to inform the operator that the fault is removed, so that the personal safety of the operator on the locomotive is ensured.

Drawings

Fig. 1 is a plan view of the present invention.

Fig. 2 is a cross-sectional view taken along the A-A plane of fig. 1.

Fig. 3 is a cross-sectional view of a second connector and associated component connection of the present invention.

Fig. 4 is a cross-sectional view of a second connector of the present invention.

Wherein 1 is the dustcoat, 2 is the body, 3 is the inner chamber, 4 is the static contact, 5 is stress cone, 6 is the mount pad, 7 is first connecting piece, 71 is the cylindricality neck of first connecting piece, 72 is the toper neck of first connecting piece, 73 is first flange, 8 is high-voltage cable, 9 is the tuber pipe, 10 is the cylinder, 11 is the solenoid valve, 12 is the locating part, 121 is the fourth flange, 122 is the third flange, 13 is the second connecting piece, 131 is the second flange, 132 is the neck of second connecting piece, 133 is first boss, 134 is the second boss, 14 is the packing ring, 15 is the blotter, 16 is the reed, 17 is the moving contact, 18 is the moving contact seat, 19 is the elastic component.

Detailed Description

As shown in fig. 2, the invention comprises a high-voltage cable 8, a first connecting piece 7, a mounting seat 6, a stress cone 5, a fixed contact 4, a movable contact 17, a movable contact seat 18, a second connecting piece 13 and a body 2. Wherein, the first connecting piece 7 is a first flange, and the second connecting piece 13 is a second flange.

The body 2 provides an outer insulation protection and an inner closed cavity, and the moving track of the moving contact 17 and the moving contact 4 during the separation and the combination is determined by the guiding function of the second connecting piece 13 on the moving contact seat 18. The head of the fixed contact 4 is spherical, and the end surface is inlaid with a high-temperature-resistant molybdenum block, and the molybdenum block can reduce metal vapor generated by arc combustion.

As shown in fig. 2, one end of the first connecting member 7 is provided with a cylindrical neck 71, the other end of the first connecting member 7 is provided with a first flange 73, the first connecting member 7 is provided with a tapered neck 72 between the cylindrical neck 71 and the first flange 73, and the diameter of a through hole at the connection part of the tapered neck 72 and the cylindrical neck 71 is smaller than that at the connection part of the tapered neck 72 and the first flange 73. As shown in fig. 4, the second connecting member 13 is provided with a second flange 132, a neck 132 of the second connecting member is provided on a side of the second flange 132 away from the main body 2, and a first boss 133 and a second boss 134 are provided on an inner side of the neck 132 of the second connecting member. The first boss 133 and the second boss 134 are both parallel to the second flange 131. The inner side of the second connector 13, i.e. the inner side of the second connector neck 132. One surface of the first boss 133, which is close to the second flange 131, is a lower surface of the first boss 133.

As shown in fig. 2, the first flange 73 is detachably mounted on the mount 6, and the mount 6 is mounted on the roof. The cylindrical neck 71 of the first connecting piece is tightly pressed on the outer sheath of the high-voltage cable 8 through an O-shaped sealing ring, the fixed contact 4 is arranged at the end part of the high-voltage cable 8, one end of the fixed contact 4 is in compression joint with the copper core of the high-voltage cable 8, the other end of the fixed contact 4 is connected with the moving contact 17, one end, far away from the fixed contact 4, of the moving contact 17 is provided with the moving contact seat 18, and the moving contact seat 18 is connected with the second connecting piece 13. The stress cone 5 is located on the high voltage cable 8 between the stationary contact 4 and the cylindrical neck 71 of the first connection. The two ends of the body 2 are respectively connected with the mounting seat 6 and the second flange 131 of the second connecting piece 13. The first connecting piece 7, the mounting seat 6, the body 2, the second connecting piece 13 and the movable contact seat 18, and the movable contact 17, the fixed contact 4, the stress cone 5 and the high-voltage cable 8 form a closed inner cavity 3.

As shown in fig. 1, the inflator of the present invention includes a cylinder 10, a solenoid valve 11, and an air duct 9. The electromagnetic valve 11 is used as a valve for opening and closing a gas path and a signal transmission device. The cylinder 10 is mounted on the same side of the fixed seat 6 as the first connecting piece 7. The compressed air is compressed air, and the air pressure of the compressed air is between 700 and 900 kpa. The air cylinder 10 and the electromagnetic valve 11 are communicated with an air passage through an L-shaped connecting pipe, and the electromagnetic valve 11 is connected to a control circuit on a locomotive. The air pipe 9 is connected with the inner cavity 3 in a penetrating way through the conical neck of the first connecting piece.

As shown in fig. 3, the present invention further includes a stopper 12, an elastic member 19, a washer 14, a cushion 15, and a reed 16. The limiting piece 12 is made of metal, and when the moving contact 17 is separated from the fixed contact 4, the moving contact 17 is prevented from being excessively displaced to be separated from the inner cavity 3 of the body, so that the moving contact 17 is convenient to reset. The elastic piece 19 is formed by pressing a stainless steel plate with the thickness of 0.16-0.2mm, and when the moving contact 17 is separated from the fixed contact 4, the elastic piece 19 can be compressed by the moving contact 17 and provides restoring power for the moving contact 17. The cushion ring 14 and the cushion pad 15 form the buffer device, which can buffer the impact force of the moving contact 17 in the later stage of movement, prevent the moving contact seat 18 from directly contacting with the limiting piece 12 to damage the limiting piece 12, and prevent the impact force of the moving contact seat 18 from loosening the limiting piece 12, thereby ensuring stable structure. The spring 16 has a certain clamping force, and can provide a guiding function for the movable contact 17 to compress the elastic piece 19, so that the movable contact 17 is ensured to move in the axial direction of the body, and the movable contact 17 is convenient to reset.

As shown in fig. 3, a third flange 122 is disposed on the outer side of one end of the limiting member 12, and the third flange 122 is disposed parallel to the second flange 131; the side surface of the third flange 122 is fixedly connected to the inner side of the neck 132 of the second connecting piece, a fourth flange 121 is arranged on the inner side of the other end of the limiting piece 12, and the fourth flange 121 is parallel to the third flange 122; one surface of the fourth flange 121, which is close to the third flange 122, is fixedly connected with one end of the elastic member 19, and the other end of the elastic member 19 is fixedly connected with the movable contact seat 18. The movable contact seat 18 is lapped on the first boss 133. One surface of the third flange 122, which is close to the first boss 133, is connected to one surface of the gasket 14, the other surface of the gasket 14 is connected to one surface of the cushion 15, and the other surface of the cushion 15 is clamped on the second boss 134. The reed 16 is fixedly installed on the lower surface of the first boss 133, and the reed 16 is sleeved on the outer surface of the movable contact 17.

As shown in fig. 1 and 2, the present invention further includes a housing 1, where the housing 1 is made of metal, and the housing 1 is located at an outer side of the neck 132 of the second connecting piece and fixedly connected to a side of the second flange 131 away from the main body 2. The cover 1 provides protection for the invention, such as waterproofing, dust protection.

According to the above-mentioned scheme, when the electromagnetic valve 11 closes the air passage, the inflation device is in an initial state when the inflation device does not inflate the inner cavity 3. At this time, the stationary contact 4 is in contact with the moving contact 17, and when the high voltage cable 8 is connected to high voltage electricity, the housing 1 guides the electricity to the electrical equipment of the locomotive.

When the high-voltage main circuit or the electric equipment on the main circuit fails, the control circuit can be operated to enable the electromagnetic valve 11 to be electrified, compressed air in the air cylinder 10 is transmitted to the inner cavity 3 formed by the first connecting piece 7, the body 2, the movable contact seat 18, the movable contact 17, the fixed contact 4 and the stress cone 5 through the electromagnetic valve 11 and the air pipe 9, the movable contact 17 compresses the elastic piece 19 backwards to move, and the movable contact 17 is separated from the fixed contact 4. At this time, the compressed air forms a high-speed air flow at the nozzles of the moving contact 17 and the fixed contact 4, so as to strongly blow and cool the electric arc generated when the moving contact 17 and the fixed contact 4 are separated, and force the electric arc to be extinguished when the current crosses zero. After the arc is extinguished, the arc gap is filled with fresh compressed air rapidly, so that the insulation medium between the fracture is recovered rapidly, and heavy breakdown is avoided. The electromagnetic valve 11 delays for a certain time, the power is cut off after the electric arc is completely extinguished, the compressed air is discharged to the atmosphere by the electromagnetic valve 11, at the moment, the high-voltage main circuit is in a power-off state, the moving contact 7 returns to the original point under the compression force of the elastic piece 19, meanwhile, the electromagnetic valve 11 transmits a power-off electric signal to a rolling stock through the control circuit, and after the rolling stock receives the signal, a worker can detach the first connecting piece 7 to separate the rolling stock circuit from the high-voltage main circuit.

The invention can separate the locomotive circuit from the main circuit under the condition of electrification, limit the loss to the minimum, transmit the separation signal to the locomotive and ensure the personal safety of operators on the locomotive.

Claims

1. An insulator comprising a body (2); two ends of the body (2) are respectively connected with the first connecting piece (7) and the second connecting piece (13); one end of a high-voltage cable (8) passes through the first connecting piece (7) and stretches into the inner cavity (3) of the body; the inflatable device is characterized in that the inner cavity (3) is communicated with the inflatable device; the end part of the high-voltage cable (8) extending into the inner cavity (3) is provided with a fixed contact (4), the head part of the fixed contact (4) is spherical, and the surface of the end part is embedded with a high-temperature-resistant molybdenum block; a moving contact (17) is arranged on the second connecting piece (13), and the moving contact (17) is of an inclined cone structure; in an initial state, the moving contact (17) is in contact with the fixed contact (4); when the air charging device charges compressed air into the inner cavity (3), the moving contact (17) moves away from the fixed contact (4) under the action of air flow, so that the moving contact is separated from the fixed contact (4), and the air pressure of the compressed air is higher than 700kpa.

2. Insulator according to claim 1, characterized in that the said inflation means comprise a cylinder (10), a solenoid valve (11) and a bellows (9); one end of the electromagnetic valve (11) is connected with the air cylinder (10), the other end of the electromagnetic valve (11) is connected with one end of the air pipe (9), and the other end of the air pipe (9) is in through connection with the inner cavity (3) through the first connecting piece (7).

3. Insulator according to claim 2, characterized in that the compressed gas pressure in the cylinder (10) is higher than 700kpa.

4. An insulator according to claim 3, characterised in that the solenoid valve (11) is electrically connected to the control system of the locomotive.

5. Insulator according to one of claims 1 to 4, characterized in that the second connecting piece (13) is provided inside with a limiting piece (12) for preventing the moving contact (4) from coming off the body (2).

6. The insulator according to claim 5, characterized in that one end of the moving contact (17) far away from the fixed contact (4) is fixedly connected with a moving contact seat (18), one end of the moving contact seat (18) close to the limiting piece (12) is fixedly connected with one end of an elastic piece (19), and the other end of the elastic piece (19) is in contact with the limiting piece (12); the side edge of the movable contact seat (18) is lapped on a first boss (133) on the inner side of the second connecting piece (13).

7. Insulator according to claim 6, characterized in that a buffer means is provided between the stop (12) and the first boss (133).

8. The insulator according to claim 7, characterized in that the top surface of the damping means is in contact with the stop element (12) and the bottom surface of the damping means is in contact with a second boss (134) inside the second connecting element (13).

9. The insulator according to claim 8, characterized in that the lower surface of the first boss (133) is fixedly provided with a reed (16), and the reed (16) is sleeved on the outer surface of the movable contact (17).

10. Insulator according to one of claims 1 to 4, characterized in that the second connection piece (13) is arranged in the housing (1).