Switchgear and switchgear operating mechanism

Patent metadata

Field	Value
Publication number	US-9349554-B2
Application number	US-201414291580-A
Country	US
Kind code	B2
Filing date	May 30, 2014
Priority date	Jan 11, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A switchgear operating mechanism has: a ratchet wheel that rotates together with a closing shaft; a stop lever that enables contact between an energy storing cam and a roller; a motor that transmits power to a feed lever; a feed pawl; stop pawls that suppresses reverse rotation of the feed pawl; a closing lever that expands/contracts a closing spring; a catch mechanism for energy storage for the closing lever; a closing cam; a stopper unit that suppresses rotation of the stop lever; a first sprocket; second and third sprockets that are capable of rotating together with an intermediate shaft; a fourth sprocket rotatably fastened to an energy storing cam shaft; a first chain that engages with the first and second sprockets; and a second chain that engages with the third and fourth sprockets.

First claim

What is claimed is:

1. A switchgear operating mechanism for reciprocatively driving a movable contact of a switchgear so as to shift the switchgear between a cutoff state and a closed state, the switchgear operating mechanism comprising:
a support structure;
a closing shaft extending in a first rotation axis direction to be rotatably supported by the support structure;
a ratchet wheel having substantially a disk-like shape, having a plurality of outer peripheral teeth formed along an outer peripheral side surface thereof and fixed to the closing shaft to be rotated together with the closing shaft;
a feed lever having a plate-like shape, juxtaposed to the ratchet wheel in an axial direction thereof so as to be swingable about the closing shaft in a peripheral direction and provided with, near an outer periphery thereof, a feed lever roller rotatable about a second rotation axis extending in parallel to the closing shaft;
a stop lever having a plate-like shape, juxtaposed to the feed lever in the first rotation axis direction so as to be swingable about the closing shaft in a peripheral direction and provided with, near an outer periphery thereof, an energy storing cam rotatable about an energy storing cam shaft extending in parallel to the closing shaft, the energy storing cam being contactable with a periphery of the feed lever roller;
a motor fixed to the support structure and configured to transmit power for swinging the feed lever;
a feed pawl fixed to the feed lever so as to be engageable with the outer peripheral teeth and configured to transmit the power from the motor to the ratchet wheel to rotate the ratchet wheel and the closing shaft in at least one direction;
a plurality of stop pawls fixed to the stop lever and engaged with the ratchet wheel so as to prevent the ratchet wheel and the closing shaft from being rotated in a reverse direction to the one direction;
a closing spring configured to be expanded/contracted with rotation of the closing shaft;
a closing lever fixed to the closing shaft and configured to have the closing spring expand/contract by rotation of the closing shaft;
a catch mechanism configured to maintain an energy storing state of the closing spring;
a closing cam fixed to the closing shaft to be rotated together with the closing shaft;
a first sprocket fixed to an output shaft of the motor;
a sprocket base fixed to the support structure;
an intermediate shaft rotatably supported by the sprocket base;
a second sprocket fixed to the intermediate shaft so as to be rotatable together with the intermediate shaft;
a third sprocket fixed to the intermediate shaft so as to be rotatable together with the intermediate shaft;
a fourth sprocket rotatably fixed to the energy storing cam shaft;
a first chain meshed with the first and the second sprockets; and
a second chain meshed with the third and the fourth sprockets.

2. The switchgear operating mechanism according to claim 1 , wherein
centers of the first rotation axis, the energy storing cam shaft, and the intermediate shaft are positioned on substantially the same straight line at time of energy storing operation of the closing spring after completion of closing operation of the switchgear.

3. The switchgear operating mechanism according to claim 1 , wherein
a spacer is disposed between the motor and the support structure.

4. The switchgear operating mechanism according to claim 1 , wherein
a spacer is disposed between the sprocket base and support structure.

5. The switchgear operating mechanism according to claim 1 , further comprising:
a stopper unit fixed to the support structure so as to be held between the stop lever and the support structure and configured to be engaged with the stop lever to prevent rotation of the stop lever, wherein
the stopper unit includes:
a piston plate engaged with the stop lever;
a piston having a first end to which the piston plate is fixed and a second end being freely contactable/separable and configured to be reciprocated between the stop lever and the support structure in a manner engageable with the stop lever;
a stopper having a cavity inside thereof, fixed to the support structure and accommodating the piston in the cavity so as to guide movement of the piston;
a stop plate fitted into the stopper so as to limit a movement range of the reciprocating movement of the piston; and
a return spring disposed between the piston and the stopper to bias the piston in one direction, and

hydraulic oil is encapsulated in a space surrounded by the piston, the stopper, and the stop plate.

6. The switchgear operating mechanism according to claim 5 , wherein
a concave part is formed at the second end side of the piston,
a plurality of orifice holes are formed so as to allow a pressurizing chamber formed by being surrounded by an inner peripheral side of the concave part and the stopper, and a pressure releasing chamber formed by being surrounded by an outer peripheral side of the concave part, the piston, the stopper, and the stop plate, to communicate with each other at the reciprocating movement position at which the piston plate fixed to the first end of the piston and the stop plate are separated farthest from each other, and
the encapsulated hydraulic oil can flow in and out between the pressurizing chamber and the pressure releasing chamber through any of the orifice holes during the reciprocating movement of the piston.

7. The switchgear operating mechanism according to claim 5 , wherein
at least one of a spacer and an elastic body is disposed between the stopper unit and the support structure.

8. The switchgear operating mechanism according to claim 5 , wherein
at a time of energy storing operation of the closing spring after completion of closing operation of the switchgear, the energy storing cam shaft of the energy storing cam is disposed at the stopper side with respect to a first straight line connecting the first rotation axis of the closing shaft and the intermediate shaft.

9. The switchgear operating mechanism according to claim 8 , wherein
a first angle formed by a first straight line connecting the first rotation axis of the closing shaft at the time of energy storing operation of the closing spring after completion of closing operation of the switchgear and the intermediate shaft and a second straight line connecting the first rotation axis of the closing shaft and the energy storing cam shaft of the energy storing cam is substantially half of a second angle formed by a third straight line connecting the first rotation axis of the closing shaft in an energy storage completion state of the closing spring and the second straight line.

10. A switchgear comprising:
a movable contact that can be moved in a reciprocating manner, and
an operating mechanism that reciprocatively drives the movable contact and configured to be shifted between a cutoff state and a closed state by the movement of the movable contact, the operating mechanism including:
a support structure;
a closing shaft extending in a first rotation axis direction to be rotatably supported by the support structure;
a ratchet wheel having substantially a disk-like shape, having a plurality of outer peripheral teeth formed along an outer peripheral side surface thereof and fixed to the closing shaft to be rotated together with the closing shaft;
a feed lever having a plate-like shape, juxtaposed to the ratchet wheel in an axial direction thereof so as to be swingable about the closing shaft in a peripheral direction and provided with, near an outer periphery thereof, a feed lever roller rotatable about a second rotation axis extending in parallel to the closing shaft;
a stop lever havin

Assignees

• Toshiba Kk

Inventors

• Ohda Yoshiaki
• Watanabe Tatsuya
• Kobayashi Yoshikata
• Shimizu Masaharu
• Marushima Satoshi

Classifications

• H01H21/48 Primary

  incorporating a ratchet mechanism · CPC title

• H01H3/42

  using cam or eccentric · CPC title

• H01H3/58

  using friction, toothed, or other mechanical clutch · CPC title

• H01H71/70

  actuated by electric motor · CPC title

• H01H7/03

  with dash-pots · CPC title