CN216818130U

CN216818130U - SF6 direct-acting pneumatic load switch for 40.5kV

Info

Publication number: CN216818130U
Application number: CN202121998254.9U
Authority: CN
Inventors: 徐雷; 孙敏; 颜建; 陈文浩
Original assignee: Jiangsu Dechun Power Electric Co ltd
Current assignee: Jiangsu Dechun Power Electric Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-06-24
Anticipated expiration: 2031-08-24

Abstract

The utility model relates to the field of electrical equipment, in particular to a 40.5kV SF6 direct-acting pneumatic load switch, which comprises a connecting substrate and a hexagonal shaft driven by external power, wherein the connecting substrate is provided with a plurality of switch transmission chambers in parallel, the tail ends of the switch transmission chambers are all fixed on the hexagonal shaft, and the hexagonal shaft is driven by the external power to rotate so as to close and separate the direct-acting pneumatic load switch; the switch transmission chamber comprises a detachable lower shell, a linkage mechanism and an ejection mechanism are contained in the lower shell, an arc extinguishing air chamber with a hollow inner part is fixed above the lower shell, and the ejection mechanism penetrates through the lower shell and extends upwards into the arc extinguishing air chamber. The utility model adopts the cooperation of the arc extinguishing air chamber and the conductive piston, and can obtain a large gas compression ratio in a physical compression mode, thereby improving the stability of the equipment and reducing the phenomenon of point discharge to the maximum extent.

Description

SF6 direct-acting pneumatic load switch for 40.5kV

Technical Field

The utility model relates to the field of electrical equipment, in particular to an SF6 direct-acting pneumatic load switch for 40.5 kV.

Background

SF6 gas has good insulating property and arc extinguishing capability, a knife switch type arc extinguishing principle is adopted in similar products of the current well-known enterprises, the load switch mostly adopts a rotary knife switch arc extinguishing principle to break away from a contact at a high speed, the caused arc is cooled and separated through an arc extinguishing grid to extinguish the arc, but the load switch has limited arc extinguishing capability, a complex structure and poor high-voltage effect.

Therefore, a load switch capable of rapidly extinguishing the arc under the premise of not influencing the performance of the SF6 direct-acting pneumatic load switch for 0.5kV is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of designing a 40.5kV SF6 direct-acting pneumatic load switch which can quickly compress SF6 gas for arc extinction and does not influence the performance of the load switch.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

the SF6 direct-acting pneumatic load switch for 40.5kV comprises a connecting base plate and a hexagonal shaft driven by external power, wherein three switch transmission chambers are arranged on the connecting base plate in parallel, the tail ends of the switch transmission chambers are fixed on the hexagonal shaft, and the hexagonal shaft is driven by the external power to rotate so as to divide the direct-acting pneumatic load switch into two parts;

the switch transmission chamber comprises a detachable lower shell, a linkage mechanism and an ejection mechanism are contained in the lower shell, an arc extinguish chamber with a hollow inner part is fixed above the lower shell, and the ejection mechanism penetrates through the lower shell and extends upwards into the arc extinguish chamber.

Furthermore, a through connecting hole is formed in the lower shell;

the linkage mechanism comprises a swing arm and a connecting piece, one end of the swing arm is matched with the hexagonal shaft, the bottom end of the connecting piece is hinged to the other end of the swing arm, and the top end of the connecting piece is hinged to the bottom end of the ejection mechanism.

Further, ejection mechanism includes spacing portion, connecting rod, electrically conductive piston and knock-out pin, spacing portion is fixed in it is internal under the inferior valve, the connecting rod bottom with link gear swing joint, the top is passed spacing portion and casing extend upwards under with, the knock-out pin is fixed in the connecting rod top, electrically conductive piston is fixed in with one heart on the connecting rod, electrically conductive piston top is fixed with electrically conductive cover.

Further, the arc extinguishing chamber comprises an arc extinguishing cover and an arc extinguishing cylinder body, the arc extinguishing cylinder body is fixed below the arc extinguishing cover, a conductive contact is accommodated in the arc extinguishing cylinder body, and the top of the arc extinguishing cover is provided with a hole and allows the conductive contact to pass through;

the conductive contact comprises a conductor with a hollow bottom and a movable contact fixed at the top end of the conductor, and the movable contact is fixedly connected with the top end of the ejector rod.

Furthermore, the bottom of the electric conductor is contracted to the center to be matched with the outer diameter of the electric conduction sleeve, and a guide sleeve with a narrow upper part and a wide lower part is fixed above the electric conduction sleeve.

Furthermore, a voltage-sharing cover is fixed on the periphery of the arc extinguishing cylinder body.

Furthermore, a sealing ring is sleeved on the outer ring of the conductive piston, and silicone grease is coated on the sealing ring.

In summary, compared with the conventional technical means, the utility model has the following beneficial effects:

the utility model adopts the cooperation of the arc extinguish chamber and the conductive piston, improves the SF6 gas compression ratio in a physical mode, and in the brake separating process, along with the movement of the moving contact component, the SF6 gas in the closed arc extinguish chamber is compressed while the electric arc is elongated, the air pressure is increased, the high-speed SF6 gas flow is sprayed out from the nozzle, and the electric arc between the moving contact and the fixed contact is extinguished.

Drawings

The foregoing and other objects, features, and advantages of the utility model will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic view of the arc chute and lower housing of the present invention after opening;

fig. 3 is a schematic cross-sectional view of fig. 2 according to the present invention.

Wherein:

1. the device comprises a connecting substrate, a hexagonal shaft, a switch transmission chamber, a lower shell, a connecting hole, a linkage mechanism, a swing arm, a connecting piece, an ejection mechanism, a limiting part, a connecting rod, a conductive piston, a sealing ring, a pushing rod, a conductive sleeve, a guide sleeve, an arc extinguishing chamber, an arc extinguishing cover, an arc extinguishing cylinder body, a conductive contact, a conductor 731, a movable contact 732, a pressure equalizing cover 74, a connecting piece, a pushing mechanism, a limiting part, a connecting rod 62, a conductive piston, a sealing ring 631, a pushing rod 64, a conductive sleeve 65, a guide sleeve, an arc extinguishing chamber 7, an arc extinguishing cover 71, an arc extinguishing cylinder body 72, a conductive contact 73, a conductive contact 731, a conductor 732, a movable contact and a pressure equalizing cover 74.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The utility model is further illustrated with reference to the following description of the drawings:

the SF6 direct-acting pneumatic load switch for 40.5kV comprises a connecting base plate 1 and a hexagonal shaft 2 driven by external power, wherein a plurality of switch transmission chambers 3 are arranged on the connecting base plate 1 in parallel, the tail ends of the switch transmission chambers 3 are fixed on the hexagonal shaft 2, and the switch transmission chambers 3 are opened or closed after the hexagonal shaft 2 is driven to rotate by the external power;

the switch transmission chamber 3 comprises a detachable lower shell 4, a linkage mechanism 5 and an ejection mechanism 6 are arranged in the lower shell 4, an arc extinguish chamber 7 with a hollow inner part is fixed above the lower shell 4, and the ejection mechanism 6 penetrates through the lower shell 4 and extends upwards into the arc extinguish chamber 7.

In the present invention, a 40.5kV SF6 direct-acting pneumatic load switch includes a base plate and a hexagonal shaft 2 driven by external power, and the hexagonal shaft 2 drives opening and closing of a rear-side switch transmission chamber 3. The switch transmission chamber 3 is provided with a lower shell 4, the lower shell 4 is used for accommodating a linkage mechanism 5 and an ejection mechanism 6, after the linkage mechanism 5 is driven by the hexagonal shaft 2 to push the ejection mechanism 6 upwards, the ejection mechanism 6 continues to move upwards to realize the opening and closing of the switch transmission chamber 3 and discharge electric arcs out of an arc extinguish chamber 7.

The lower shell 4 is provided with a through connecting hole 41; the linkage mechanism 5 comprises a swing arm 51 and a connecting piece 52, one end of the swing arm 51 is matched with the hexagonal shaft 2, the bottom end of the connecting piece 52 is hinged with the other end of the swing arm 51, and the top end of the connecting piece 52 is hinged with the bottom end of the ejection mechanism 6.

The lower case 4 is opened at its distal end with a coupling hole 41, and the coupling hole 41 allows the hexagonal shaft 2 to pass therethrough and forms a support for the lower case 4. The inner shape of the tail end of the swing arm 51 is matched with the shape of the outer ring of the hexagonal shaft 2, and the swing arm 51 is driven to rotate when the hexagonal shaft 2 rotates. The connecting piece 52 is hinged at the other end of the swing arm 51, and the top of the connecting piece 52 is hinged with the ejection mechanism 6, so that when the hexagonal shaft 2 rotates, the swing arm 51 rotates to drive the ejection mechanism 6 to move up and down.

The ejection mechanism 6 comprises a limiting part 61, a connecting rod 62, a conductive piston 63 and an ejection rod 64, the limiting part 61 is fixed in the lower shell 4, the bottom of the connecting rod 62 is movably connected with the linkage mechanism 5, the top of the connecting rod passes through the limiting part 61 and the lower shell 4 to extend upwards, the ejection rod 64 is fixed at the top of the connecting rod 62, the conductive piston 63 is concentrically fixed on the connecting rod 62, and a conductive sleeve 65 is fixed above the conductive piston 63. The arc extinguishing chamber 7 comprises an arc extinguishing cover 71 and an arc extinguishing cylinder 72, wherein the arc extinguishing cylinder 72 is fixed below the arc extinguishing cover 71, a conductive contact 73 is arranged in the arc extinguishing cylinder 72, and the top of the arc extinguishing cover 71 is provided with an opening for allowing the conductive contact 73 to pass through; the conductive contact 73 includes a conductive body 731 having a hollow bottom, and a movable contact 732 fixed to a top end of the conductive body 731, and the movable contact 732 is fixedly connected to a top end of the ejector rod 64. A pressure equalizing cover 74 is fixed to the outer periphery of the arc extinguishing block 72.

In the utility model, when the swing arm 51 pushes the ejection mechanism 6 to move upwards, the connecting rod 62 is pushed by the connecting sheet 52 and the swing arm 51, and the upward ejection action is realized under the limiting action of the limiting part 61. In the process of upward ejection, when the conductive sleeve 65 and the conductive body 731 are in contact with each other, an electric arc is generated at a moment, and at the moment, due to the existence of the conductive piston 63, the generated electric arc is pushed out from a hole formed in the top of the arc extinguishing cover 71, so that an arc extinguishing effect is realized, and finally, the conductive contact 73 extends out of the arc extinguishing cover 71 to realize the closing of the load switch.

The bottom of the conductor 731 is shrunk to match the outer diameter of the conductive sleeve 65 toward the center, and a guide sleeve 66 with a narrow top and a wide bottom is fixed above the conductive sleeve 65. The guide sleeve 66 is made of an insulating material, and the top part of the guide sleeve is narrow, and the lower part of the guide sleeve is wide, so that the conductive sleeve 65 can be effectively guided to be in contact with the conductive body 731 to be conducted.

The outer ring of the conductive piston 63 is sleeved with a sealing ring 631, and silicone grease is coated on the sealing ring 631. A sealing ring 631 is embedded outside the conductive piston 63, the sealing ring 631 is made of rubber material to prevent arc leakage, and in order to reduce the resistance between the arc extinguish chamber 7 and the sealing ring 631, silicone grease is coated around the sealing ring 631 for lubrication.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1.40.5kV SF6 direct-acting pneumatic load switch, which is characterized by comprising a connecting base plate and a hexagonal shaft driven by external power, wherein three switch transmission chambers are arranged on the connecting base plate in parallel, the tail ends of the switch transmission chambers are fixed on the hexagonal shaft, and the hexagonal shaft is driven by the external power to rotate, so that the 40.5kV SF6 direct-acting pneumatic load switch is divided;

2. The 40.5kV SF6 direct-acting pneumatic load switch as recited in claim 1, wherein said lower case has a through connection hole;

3. The SF6 direct-acting pneumatic load switch for 40.5kV, according to claim 1, wherein the ejector mechanism includes a limiting portion, a connecting rod, a conductive piston and an ejector rod, the limiting portion is fixed in the lower housing, the bottom of the connecting rod is movably connected with the linkage mechanism, the top of the connecting rod passes through the limiting portion and the lower housing and extends upwards, the ejector rod is fixed at the top of the connecting rod, the conductive piston is concentrically fixed on the connecting rod, and a conductive sleeve is fixed above the conductive piston.

4. The 40.5kV SF6 direct-acting pneumatic load switch as recited in claim 3, wherein said arc extinguishing chamber comprises an arc extinguishing chamber and an arc extinguishing cylinder fixed below said arc extinguishing chamber, said arc extinguishing cylinder containing a conductive contact, said arc extinguishing chamber having an opening at its top for allowing said conductive contact to pass through;

the conductive contact comprises a conductive body with a hollow bottom and a movable contact fixed at the top end of the conductive body, and the movable contact is fixedly connected with the top end of the ejection rod.

5. The 40.5kV SF6 direct-acting pneumatic load switch as claimed in claim 4, wherein said conductor bottom is narrowed to match the outer diameter of said conductive sleeve, and a guide sleeve with a narrow top and a wide bottom is fixed above said conductive sleeve.

6. The 40.5kV SF6 direct-acting pneumatic load switch as claimed in claim 4, wherein a voltage-equalizing cover is further fixed to an outer periphery of said arc-extinguishing cylinder.

7. The 40.5kV SF6 direct-acting pneumatic load switch as claimed in claim 3, wherein said conductive piston has a sealing ring sleeved on its outer circumference, and said sealing ring is coated with silicone grease.