JP2015069955A - Operation mechanism for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation mechanism for a circuit breaker capable of easily adjusting an operation range of a movable electrode.SOLUTION: An operation mechanism for a circuit breaker includes: movable electrodes 4a, 4b, 4c which come into contact with and separate from fixed electrodes 22a, 22b, 22c; rotatable operation shafts 7a, 7b which are arranged in substantially parallel to the movable electrodes 4a, 4b, 4c and have a trapezoidal screw, respectively; screw receivers 8a, 8b which are screwed to the operation shafts 7a, 7b; and insulation coupling plates 5a, 5b which fix the screw receivers 8a, 8b and the movable electrodes 4a, 4b, 4c. The moving distance up to the fixed electrodes 22a, 22b, 22c is adjusted by the axial length of the operation shafts 7a, 7b.

Description

  Embodiments described herein relate generally to an operation mechanism of a switch that can easily adjust an operation range of a movable electrode that is in contact with and away from a fixed electrode.

  Conventionally, the movable electrode of a switch such as a ground switch or a disconnect switch has a relatively long distance to move, so a small operation is converted into a large operation using a link mechanism that combines a rotational operation and a linear operation ( For example, see Patent Document 1). For this reason, the number of parts is increased, and the operation range of the movable electrode changes depending on the rotation angle and the link length of the link mechanism.

JP 2004-206991 A

  The problem to be solved by the present invention is to provide a switch operating mechanism that can easily adjust the operating range of the movable electrode. The moving distance of the movable electrode includes a relatively long one as in the conventional case.

  In order to solve the above-described problem, an operation mechanism of a switch according to an embodiment includes a movable electrode that is in contact with and away from a fixed electrode, a rotatable operation shaft that is disposed substantially parallel to the movable electrode and that is provided with a trapezoidal screw. And a screw receiver screwed onto the operation shaft, and an insulating connecting plate to which the screw receiver and the movable electrode are fixed.

The side view which shows a part of structure of the operation mechanism of the switch which concerns on Example 1 of this invention, and shows it in cross section. FIG. 2 is a cross-sectional view taken along line aa in FIG. 1. Bb sectional drawing of FIG. The side view explaining operation | movement of the operating mechanism of the switch concerning Example 1 of this invention. The figure which shows the structure of the rotation part of the operating mechanism of the switch concerning Example 2 of this invention.

  In the embodiment of the present invention, a rotary motion by a screw is converted into a linear motion, and the movable electrode is moved. Embodiments of the present invention will be described below with reference to the drawings.

  First, an operation mechanism of a switch according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a side view showing a part of the configuration of a switch operating mechanism according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line aa in FIG. 1, and FIG. bb sectional drawing and Drawing 4 are side views explaining operation of an operation mechanism of a switch concerning Example 1 of the present invention. The switch will be described using a ground switch.

  As shown in FIG. 1, three-phase opening holes 2 a, 2 b, and 2 c are provided in a row in the flange 1 that constitutes the operation mechanism. In the opening holes 2a, 2b, and 2c, annular insulating collars 3a, 3b, and 3c are provided on the inner surface, and rod-shaped three-phase ground electrodes (movable electrodes) 4a, 4b, and 4c are movably penetrated. As shown in FIG. 2, the ground-side ends of the ground electrodes 4a, 4b, and 4c are sandwiched between two insulating connecting plates 5a and 5b, and the connecting pins 6a, 6b, and 6c are respectively penetrated and fixed. The ground electrodes 4a, 4b, 4c are connected to a ground electrode (not shown).

  Between the RS phases of the ground electrodes 4a, 4b and 4c, the first operating shaft 7a having a trapezoidal screw and the second operating shaft 7b having a trapezoidal screw are also arranged substantially in parallel between the ST phases. Yes. “Substantially parallel” includes assembly error, manufacturing error, and the like. First and second screw receivers 8a and 8b are screwed onto the first and second operation shafts 7a and 7b, respectively. Similar to the ground electrodes 4a, 4b, and 4c, the first and second screw receivers 8a and 8b are sandwiched between two insulating connecting plates 5a and 5b, and bolts 9a and 9b are respectively penetrated and fixed. .

  The flange 1 side ends of the first and second operation shafts 7a and 7b are provided so as to sandwich the bearing plates 10a and 10b through which the first and second operation shafts 7a and 7b pass, and the bearing plates 10a and 10b. A pair of thrust bearings 11a and 11b and first and second bearing members 13a and 13b having studs 12a and 12b for keeping the bearing plates 10a and 10b at a predetermined height are rotatably fixed.

  The ground-side ends of the first and second operation shafts 7a and 7b that have passed through the insulating connecting plates 5a and 5b are formed as smooth rods without a trapezoidal screw, and pass through the base plate 14 in a freely rotatable manner. . First and second spur gears 15a and 15b are fixed to the first and second operation shafts 7a and 7b penetrating the base plate 14, respectively. A third gear 16 is provided between the first and second spur gears 15a and 15b, and one end of the rotating shaft 17 passes through the base plate 14 in a freely rotatable manner. The first, second, and third spur gears 15a, 15b, and 16 have the same shape and mesh with each other as shown in FIG.

  A cover plate 18 is provided so as to cover the first, second, and third spur gears 15a, 15b, and 16, and the first and second operation shafts 7a and 7b and the other end of the rotary shaft 17 are rotatable. Has penetrated. Studs 19 having a predetermined height are provided at both ends of the cover plate 18 and are fixed to the base plate 14 with bolts 20. One end of the side plate 21 is fixed to both ends of the base plate 14, and the other end is fixed to the flange 1. In addition, three-phase main circuit electrodes (fixed electrodes) 22a, 22b, and 22c are provided to face the tips of the ground electrodes 4a, 4b, and 4c.

  Next, the grounding operation of the main circuit will be described with reference to FIG.

  As shown in FIG. 4, when at least one of the first and second operation shafts 7a and 7b is rotated by a handle (not shown), the first and second spur gears 15a, 15b rotates simultaneously in the same direction, and the insulating connecting plates 5a and 5b fixed to the first and second screw receivers 8a and 8b move in the upward direction in the figure. Then, the ground electrodes 4a, 4b, and 4c also move in the upward direction in the drawing, come into contact with the main circuit electrodes 22a, 22b, and 22c, respectively, and become ground positions. At the contact position, an upper limit stopper (not shown) is provided. When the first and second operation shafts 7a and 7b are rotated in the reverse direction, the insulating connecting plates 5a and 5b are moved downward in the figure, and can be brought into the open position shown in FIG. A lower limit stopper (not shown) is also provided at the open circuit position.

  As a result, even if the distance for moving the three-phase ground electrodes 4a, 4b, and 4c becomes longer as the voltage increases, it is easy to adjust the length of the first and second operation shafts 7a and 7b. Can respond. This distance can be up to about 1 m, and adjustment of the rotation angle and length of the link becomes unnecessary, and the number of parts can be reduced. Further, since trapezoidal screws are used for the first and second operation shafts 7a and 7b, most of the thrust load is received by the first and second screw receivers 8a and 8b, and a large stress is applied to other parts. The ground electrodes 4a, 4b, and 4c can be reliably moved simultaneously. Further, if the first and second operation shafts 7a and 7b are rotationally controlled by a motor (not shown) or the like, the moving speed (opening and closing speed) of the ground electrodes 4a, 4b and 4c can be controlled, and high speed opening and closing is possible. is there.

  According to the switch operating mechanism of the first embodiment, the three-phase ground electrodes 4a, 4b, 4c, which are movable electrodes, are connected by the insulating connection plates 5a, 5b to which the first and second screw receivers 8a, 8b are fixed. Since the first and second operation shafts 7a and 7b are screwed to the first and second screw receivers 8a and 8b, the first and second operation shafts 7a and 7b are rotated. Accordingly, the ground electrodes 4a, 4b, and 4c can be moved, the distance to be moved can be easily adjusted, and the number of components can be reduced and the configuration can be simplified.

  In the first embodiment, the switch has been described as a ground switch. However, if the ground electrodes 4a, 4b, and 4c are insulated so as to be one main circuit electrode facing the main circuit electrodes 22a, 22b, and 22c, the disconnect switch is used. Can be used as

  Moreover, although demonstrated using the three-phase circuit, it can be used also in a single-phase circuit like a feeder. In this case, if the ground electrode for at least one phase and one operation shaft are connected and fixed by an insulating connecting plate, the opening / closing operation can be performed.

  Next, a switch operating mechanism according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram illustrating the configuration of the rotating portion of the operating mechanism of the switch according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in the method of rotating the operation shaft. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, first and second chain gears 23a and 23b having the same shape are fixed to the first and second operation shafts 7a and 7b, respectively, so as to be freely rotatable. The first and second chain gears 23 a and 23 b are connected by a chain 24.

  According to the switch operating mechanism of the second embodiment, the first and second operation shafts 7a and 7b can be simultaneously rotated by the chain 24, and the same effect as the first embodiment can be obtained.

  According to the embodiment as described above, the rotational movement of the operation shaft having the screw on the movable electrode is converted into the linear movement via the screw receiver so as to make contact with and away from the fixed electrode. Therefore, the moving distance of the movable electrode can be easily adjusted.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1 Flange 4a, 4b, 4c Ground electrode (movable electrode)
5a, 5b Insulating connecting plate 7a First operating shaft 7b Second operating shaft 8a First screw receiver 8b Second screw receiver 15a First spur gear 15b Second spur gear 16 Third spur gear 22a, 22b, 22c Main circuit electrode (fixed electrode)
23a First chain gear 23b Second chain gear 24 Chain

Claims (5)

A movable electrode contacting and separating from the fixed electrode;
A rotatable operation shaft that is disposed substantially parallel to the movable electrode and provided with a trapezoidal screw;
A screw receiver screwed onto the operation shaft;
An insulating connecting plate that fixes the screw receiver and the movable electrode;
A switch operating mechanism characterized by comprising: A three-phase movable electrode contacting and separating each of the three-phase fixed electrodes;
A rotatable first operating shaft disposed between the RS phases of the three-phase movable electrode and provided with a trapezoidal screw;
A rotatable second operating shaft disposed between the ST phases of the three-phase movable electrode and provided with a trapezoidal screw;
A first screw receiver screwed onto the first operating shaft;
A second screw receiver screwed onto the second operating shaft;
An insulating connecting plate that fixes the three-phase movable electrode, the first screw receiver, and the second screw receiver;
A first spur gear fixed to the first operating shaft;
A second spur gear fixed to the second operating shaft;
A third spur gear provided between the first spur gear and the second spur gear;
A switch operating mechanism characterized by comprising: A three-phase movable electrode contacting and separating each of the three-phase fixed electrodes;
A rotatable first operating shaft disposed between the RS phases of the three-phase movable electrode and provided with a trapezoidal screw;
A rotatable second operating shaft disposed between the ST phases of the three-phase movable electrode and provided with a trapezoidal screw;
A first screw receiver screwed onto the first operating shaft;
A second screw receiver screwed onto the second operating shaft;
An insulating connecting plate that fixes the three-phase movable electrode, the first screw receiver, and the second screw receiver;
A first chain gear fixed to the first operating shaft;
A second chain gear fixed to the second operating shaft;
A chain connecting the first chain gear and the second chain gear;
A switch operating mechanism characterized by comprising:   The switch operating mechanism according to claim 2 or 3, wherein a motor is attached to at least one of the first operating shaft and the second operating shaft.   The switch operating mechanism according to any one of claims 1 to 4, wherein the switch is a ground switch.

Images