CN219246575U

CN219246575U - Pneumatic high-voltage high-current isolating knife switch

Info

Publication number: CN219246575U
Application number: CN202320865296.8U
Authority: CN
Inventors: 薛春华; 许铭; 徐喆; 汤洁平
Original assignee: Shangke Intelligent Electric Suzhou Co ltd
Current assignee: Shangke Intelligent Electric Suzhou Co ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-06-23
Anticipated expiration: 2033-04-18

Abstract

The utility model discloses a pneumatic high-voltage high-current isolating knife switch, which comprises: frame, first insulating pillar, second insulating pillar, first pile head board, second pile head board, blade, quiet pile head, move pile head, insulating connecting rod, first crank arm, second crank arm and cylinder, the blade can overturn and set up on moving pile head and correspond with quiet pile head, quiet pile head and move pile head both sides are provided with the contact finger seat that upwards extends, contact finger seat inboard is provided with the contact finger, be provided with the spring between contact finger seat and the contact finger, be provided with the pivot that is located the blade below in the frame, first crank arm and second crank arm are V-arrangement alternately and set up in the pivot, the cylinder sets up between frame and first crank arm outer end. Through the mode, the pneumatic high-voltage high-current isolating knife switch has the characteristics of high operation safety, high electrified current, good thermal stability and small contact resistance, and the safety and the operation reliability are improved.

Description

Pneumatic high-voltage high-current isolating knife switch

Technical Field

The utility model relates to the technical field of isolating knife switches, in particular to a pneumatic high-voltage high-current isolating knife switch.

Background

The traditional high-voltage disconnecting switch is a disconnecting switch with rated voltage of 10kV and above, and is widely applied to power lines. The isolating switch has no arc extinguishing capability, only allows the line to be switched on or off under the condition of no load current, and is suitable for being used in conventional electric energy transmission or line conversion. Because the test voltage of the circuit in the reliability test of the high-voltage electrical appliance is high, the test current is large (the instantaneous test current is 60-120 kiloamperes), the contact resistance and the impedance of the traditional isolating knife switch are large, the thermal stability is poor, and the knife switch is burnt out due to the fact that the knife bounce easily occurs, so that the high-voltage electrical appliance is not suitable for being used in a high-current test circuit, and has certain danger.

In order to improve the operation safety of the high-voltage isolating knife switch in the reliability test of the high-voltage electrical appliance, the switching-on and switching-off circuit operation of the high-voltage isolating knife switch can be remotely performed through the air cylinder. Because the telescopic travel of the air cylinder can not be adjusted, the high-voltage isolating knife switch is driven inaccurately after assembly, and the circuit can not be accurately operated in a separating and combining mode. In addition, the blade of the high-voltage isolating knife switch needs to be opened and closed, the requirement on the matching precision of the high-voltage isolating knife switch and the movable pile head and the static pile head is high, the stability of a closed circuit is easily affected due to looseness, and improvement is needed.

Disclosure of Invention

The utility model mainly solves the technical problem of providing the pneumatic high-voltage high-current isolating knife switch, which realizes the opening and closing adjustment of the knife blade and improves the stability and the operation safety of a closed circuit.

In order to solve the technical problems, the utility model adopts the following technical scheme: provided is a pneumatic high-voltage high-current isolating knife switch, comprising: the device comprises a frame, a first insulating support, a second insulating support, a first pile head plate, a second pile head plate, a blade, a static pile head, a movable pile head, an insulating connecting rod, a first crank arm, a second crank arm and a cylinder, wherein the first insulating support and the second insulating support are arranged on the frame at intervals, the first pile head plate is horizontally arranged at the top of the first insulating support, the second pile head plate is horizontally arranged at the top of the second insulating support, the static pile head is arranged on the first pile head plate, the movable pile head is arranged on the second pile head plate, the blade is arranged on the movable pile head in a reversible manner and corresponds to the static pile head, contact finger seats extending upwards are arranged on two sides of the static pile head and the movable pile head, contact fingers are arranged on the inner sides of the contact finger seats, counter bores are arranged in the contact finger seats, screws connected with the contact finger seats, a spring is arranged between the contact finger seats and the contact fingers, a rotating shaft positioned below the blade is arranged in the frame, the first crank arm and the second crank arm are arranged on the outer side of the frame, the pin shaft is arranged between the first arm and the first crank arm and the outer end of the cylinder, and the outer crank arm is arranged on the outer side of the rotating shaft.

In a preferred embodiment of the present utility model, the inner ends of the first crank arm and the second crank arm are respectively provided with a rotating sleeve sleeved on the rotating shaft.

In a preferred embodiment of the present utility model, racks are disposed on the inner wall of the rotating sleeve at intervals, and tooth grooves corresponding to the racks are disposed on the outer circle of the rotating shaft.

In a preferred embodiment of the present utility model, positioning blind holes corresponding to the ends of the springs are respectively disposed in the contact finger holders and the contact fingers.

In a preferred embodiment of the present utility model, the static pile head has an inverted T-shaped structure.

In a preferred embodiment of the utility model, the number of blades is 2.

In a preferred embodiment of the utility model, both ends of the contact finger are provided with chamfers.

The beneficial effects of the utility model are as follows: according to the pneumatic high-voltage high-current isolating knife switch, the compressed air is utilized to remotely operate the air cylinder, the safety is high, the opening and closing angles of the blades are adjusted when the air cylinder stretches and contracts by changing the V-shaped included angles of the first crank arm and the second crank arm, and the bouncing of the blades is prevented when the knife switch is closed by a mechanical locking device in the air cylinder and is lost by high current or an air source, so that the insulation distance between the opened blades and the static pile head can be ensured, the blades can be accurately closed in the static pile head, the elastic clamping of the blades is carried out by utilizing the contact fingers, the contact resistance and the reactance after the closing are greatly reduced, and the thermal stability of the knife switch is greatly improved.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic diagram of a pneumatic high voltage high current isolation knife switch according to a preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a schematic view of the blade of FIG. 1 after being flipped open;

fig. 4 is a schematic structural view of the first crank arm and the second crank arm in fig. 3.

Detailed Description

The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 4, an embodiment of the present utility model includes:

the pneumatic high-voltage high-current isolating knife switch shown in fig. 1 comprises: the device comprises a frame 1, a first insulating support column 6, a second insulating support column 14, a first pile head plate 7, a second pile head plate 13, a blade 11, a static pile head 8, a movable pile head 12, an insulating connecting rod 9, a first crank arm 5, a second crank arm 4 and a cylinder 3, wherein the first insulating support column 6 and the second insulating support column 14 are arranged on the frame 1 at intervals, and safe intervals are kept.

The first pile head plate 7 is horizontally arranged at the top of the first insulating support column 6, and the second pile head plate 13 is horizontally arranged at the top of the second insulating support column 14 and is respectively fixed by screws. The static pile head 8 is arranged on the first pile head plate 7, the movable pile head 12 is arranged on the second pile head plate 13, the blade 11 is arranged on the movable pile head 12 in a reversible manner and corresponds to the static pile head 8, and as shown in fig. 3, the circuit is disconnected after the blade 11 is opened upwards.

In order to realize the opening and closing operation of the blade 11, a rotating shaft 2 positioned below the blade 11 is arranged in the frame 1, the first crank arm 5 and the second crank arm 4 are arranged on the rotating shaft 2 in a V-shaped cross manner, the air cylinder 3 is arranged between the frame 1 and the outer end of the first crank arm 5, and the first crank arm 5, the rotating shaft 2 and the second crank arm 4 are driven to twist through the expansion and the contraction of the air cylinder 3. A pin shaft 10 is arranged on the blade 11, an insulating connecting rod 9 is arranged between the pin shaft 10 and the outer end of the second crank arm 4, and the second crank arm 4 is twisted to drive the blade 11 to turn over through the insulating connecting rod 9.

The stroke of the cylinder 3 can only be finely tuned by means of the screw thread at the head of the cylinder piston rod, and in order to ensure that the front end of the blade 11 enters the static pile head 8 when closed, as shown in fig. 1, the torsion angle of the second crank arm 4 after the cylinder 3 protrudes to the limit needs to be adjusted. In this embodiment, the inner ends of the first crank arm 5 and the second crank arm 4 are respectively provided with a rotating sleeve 21 sleeved on the rotating shaft 2, the assembly is convenient, racks 19 are arranged on the inner wall of the rotating sleeve 21 at intervals, tooth grooves 20 corresponding to the racks 19 are arranged on the outer circle of the rotating shaft 2, the included angle between the first crank arm 5 and the second crank arm 4 is conveniently adjusted, the first crank arm 5 and the second crank arm 4 are adjusted to a V-shaped included angle as shown in fig. 1 through the respective rotating sleeves 21, the angle is fixed, at this time, the cylinder 3 extends out to the limit, and then the precision of the closing operation of the subsequent blade 11 can be ensured by matching with the screw teeth of the head part of the piston rod of the cylinder 3 for fine adjustment.

In order to ensure the contact reliability between the blade 11 and the static pile head 8 after closing, contact finger seats 16 extending upwards are arranged on two sides of the static pile head 8 and the movable pile head 12, and the lower parts of the contact finger seats 16 are fixed through bolts. In this embodiment, 6 contact fingers 15 are disposed on the inner side of the contact finger seat 16, a counter bore is disposed in the contact finger 15, a screw 17 connected with the contact finger seat 16 is disposed in the counter bore, a threaded hole corresponding to the screw 17 is disposed in the contact finger seat 16, and a stud is mounted in the threaded hole for fixing after the screw 17 is adjusted, so as to avoid loosening. At this time, as shown in fig. 2, the finger 15 is allowed to axially jog along the screw 17.

In the present embodiment, a spring 18 is disposed between the finger rest 16 and the finger 15 to elastically support the finger 15. The static pile head 8 is of an inverted T-shaped structure, the number of the blades 11 is 2, and the front ends of the blades 11 are positioned on two side surfaces of the upper part of the static pile head 8 when the pile is closed. Through the cooperation of the contact fingers 15, the static pile head 8 and the movable pile head 12, the elastic clamping of the two sides of the head of the blade 11 is realized, and the reliability is improved. The contact finger seats 16 and the contact fingers 15 are respectively provided with positioning blind holes which are in one-to-one correspondence with the end parts of the springs 18, so that the positioning of the two ends of the springs 18 is performed, and the falling problem is avoided. In addition, the chamfer is arranged at the two ends of the contact finger 15, so that the blade 11 can smoothly enter between the contact finger 15 and the static pile head 8 when being closed downwards.

In conclusion, according to the pneumatic high-voltage high-current isolation knife switch, the blade can be indirectly driven through the air cylinder, and the thermal stability of the knife switch is improved, the contact resistance and the impedance of the knife switch are reduced, and the reliability and the safety of the knife switch are ensured through the transformation of the movable pile head and the static pile head.

The foregoing is only illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present utility model or by other related art, either directly or indirectly, are intended to be included within the scope of the utility model.

Claims

1. A pneumatic high voltage high current isolation knife switch, comprising: the device comprises a frame, a first insulating support, a second insulating support, a first pile head plate, a second pile head plate, a blade, a static pile head, a movable pile head, an insulating connecting rod, a first crank arm, a second crank arm and a cylinder, wherein the first insulating support and the second insulating support are arranged on the frame at intervals, the first pile head plate is horizontally arranged at the top of the first insulating support, the second pile head plate is horizontally arranged at the top of the second insulating support, the static pile head is arranged on the first pile head plate, the movable pile head is arranged on the second pile head plate, the blade is arranged on the movable pile head in a reversible manner and corresponds to the static pile head, contact finger seats extending upwards are arranged on two sides of the static pile head and the movable pile head, contact fingers are arranged on the inner sides of the contact finger seats, counter bores are arranged in the contact finger seats, screws connected with the contact finger seats, a spring is arranged between the contact finger seats and the contact fingers, a rotating shaft positioned below the blade is arranged in the frame, the first crank arm and the second crank arm are arranged on the outer side of the frame, the pin shaft is arranged between the first arm and the first crank arm and the outer end of the cylinder, and the outer crank arm is arranged on the outer side of the rotating shaft.

2. The pneumatic high-voltage high-current isolating knife switch according to claim 1, wherein the inner ends of the first crank arm and the second crank arm are respectively provided with a rotating sleeve sleeved on the rotating shaft.

3. The pneumatic high-voltage high-current isolating knife switch according to claim 2, wherein racks are arranged on the inner wall of the rotating sleeve at intervals, and tooth grooves corresponding to the racks are arranged on the outer circle of the rotating shaft.

4. The pneumatic high-voltage high-current isolating knife switch according to claim 1, wherein positioning blind holes which are in one-to-one correspondence with the ends of the springs are respectively arranged in the contact finger seats and the contact fingers.

5. The pneumatic high voltage high current isolation knife switch of claim 1, wherein the static pile head is of an inverted T-shaped structure.

6. The pneumatic high voltage high current isolation knife switch of claim 1, wherein the number of blades is 2.

7. The pneumatic high-voltage high-current isolation knife switch of claim 1, wherein both ends of the contact finger are provided with chamfers.