JP4564778B2 - Switch electrode device - Google Patents

Description

The present invention relates to an improvement in an electrode device for a lightning protection switch that automatically opens a power supply when intentionally approaching lightning, particularly for the purpose of preventing lightning damage.

Conventionally, as disclosed in Japanese Patent Laid-Open No. 11-191348 (see FIG. 9), it is sandwiched by two contact blades 8a and 8b that slide in the width direction with respect to the connecting shafts 6 and 12. The fixed electrode 4 and the connecting shafts 6 and 12 are inserted, and are arranged between the heads 6a and 12a of the connecting shafts 6 and 12 and the outer surface of the contact blade 8a, and the contact blades 8a and 8b are connected to each other. In a switch provided with coil springs 11 and 17 urging in the approaching direction, a regulating member that regulates the inclination of the contact blades 8a and 8b with respect to the connecting shaft 6 between the coil springs 11 and 17 and the contact blade 8a. 10 and 16 are interposed.

In the conventional configuration, when the center position shift of the fixed electrode 4 due to an assembly error (axial shift in the direction of the connecting shaft 12) occurs, the restriction members 10 and 16 for restricting the inclination of the coil springs 11 and 17 are provided. Inclination of the movable electrodes 8a and 8b with respect to the connecting plate 18 was prevented, and the movable electrodes 8a and 8b moved in parallel with respect to the connecting plate 18 to enable stable contact between the movable electrodes 8a and 8b and the fixed electrode 4.

JP 11-191348 A

However, according to the conventional method, the movable electrodes 8a and 8b always move by an amount corresponding to the center position shift of the fixed electrode 4 during the opening / closing operation in which the center position shift of the fixed electrode 4 occurs. As a result, the coil springs 11 and 17 are also bent excessively, and there is a problem that a large closing and opening operation force is required.

In the present invention, even when the center position shift due to the assembly error of the fixed electrode 22 occurs, the coil springs 26a and 26b for securing the contact pressure between the electrodes during the opening / closing operation do not cause excessive bending, and the light load is reduced. It is an object of the present invention to provide an electrode device for a switch that can be performed by

In order to solve the problem, the present invention provides a support shaft (28) at one end of two movable electrodes (20) and (21) made of a long parallel plate, and the one end is attached to the electrode support plate (23). In the switch in which the electric circuit is opened and closed by holding the other end in contact with and away from the fixed electrode (22) by rotating the movable electrodes (20) and (21), the two movable sheets The electrodes (20) and (21) have a substantially U-shaped cross-section, and the connecting shaft (25) is inserted through the center position of the movable electrodes (20) and (21) in the longitudinal direction (L). A coil spring (26b) is interposed on the axis of the connecting shaft (25) between the head of the inserted connecting shaft (25) and the outer surface of the movable electrode (21), and the inserted connecting shaft (25) is screwed. A coil spring (26a) between the mating nut (27) and the outer surface of the movable electrode (20) Are connected to each other on the axis of the connecting shaft (25), so that they are close to each other, and arcuate protrusions (20a) and (21a) are provided at the contact portion with the fixed electrode (22) to support the electrode. A pair of arc-shaped protrusions (20c) (20c ) at a position in contact with the plate (23) along a direction perpendicular to the longitudinal direction (L) and sandwiching the support shaft (28). ), (21c) (21c), and an electrode device for a switch.

Even when the center position of the fixed electrode 22 is displaced due to an assembly error due to the projections 20c and 21c on the arcs provided on the inner surfaces of the movable electrodes 20 and 21, the movable electrodes 20 and 21 are supported by the projections 20c and 21c as fulcrums. The coil springs 26a and 26b for securing the contact pressure can be moved in a fan shape, and the throwing force is always constant and stable without being bent due to the deviation of the center position.

Further, the arcuate protrusions 20a and 21a provided on the inner side surfaces of the movable electrodes 20 and 21 form the movable electrode 20 and 21 guide portions when the distance between the movable electrodes 20 and 21 is equal to or greater than the plate thickness of the fixed electrode 22, Smooth feeding operation can be provided by the arcuate shapes 20a and 21a.

Next, preferred embodiments of the present invention will be described with reference to the examples of the drawings.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The switch according to the embodiment is a case where it is applied as an electrode device of a lightning protection switch having a function of automatically turning off a customer's power supply upon detecting a lightning strike and automatically returning the power supply in the event of a lightning strike. As the electrode configuration, two movable electrodes 20 and 21 having a substantially U-shaped cross section and arranged in parallel so that the plane portions are close to each other are fixed to a structure 30 formed of an insulating material. The support shaft 28 is held between the one end of the movable electrodes 20 and 21 and the electrode support plate 23 so as to be held between the electrode support plates 23 and serve as a rotation fulcrum of the movable electrodes 20 and 21. Usually, the electrode support plate 23 is connected to the load side.

The electric circuit is inserted into the fixed electrode 22 connected to the normal power supply side fixed on the structure 30 at a position in contact with the other end portion of the movable electrodes 20 and 21 by the rotating operation of the movable electrodes 20 and 21. The electrode parts to be formed are arranged in parallel in three phases.

The two movable electrodes 20, 21 arranged in parallel pass through the connecting shaft 25 in a hole provided in the central portion of the movable electrodes 20, 21 with respect to the longitudinal direction (L). On the connecting shaft 25 axis line between the movable electrode 20 and the coil spring 26b, the nut 27 screwing the connecting shaft 25 on the connecting shaft 25 axis line between the head of the connecting shaft 25 and the movable electrode 21 so that the 21 is close to each other. A coil spring 26a is disposed on the front side.

The amount of force of the coil springs 26a and 26b is set so that the movable electrodes 20 and 21 can hold the fixed electrode 22 and the electrode support plate 23 to ensure the contact pressure of the electrode portion.

Arc-shaped protrusions 20 a and 21 a provided at contact portions between the arcuate protrusions 20 c and 21 c provided at the contact portion with the electrode support plate 23 and the fixed electrode 22 are provided on the inner surfaces of the movable electrodes 20 and 21.
Two protrusions 20c and 21c are provided in the vertical direction (see FIG. 6) with the rotation fulcrum hole interposed therebetween to prevent the movable electrodes 20 and 21 from tilting in a direction perpendicular to the axial direction of the connecting shaft 28. It is.

The heights of the protrusions 20 c and 21 c are higher than ½ of the plate thickness of the electrode support plate 23. Desirably, the movable electrodes 20 and 21 can be kept in parallel by adjusting the height of the protrusion 20a to the height of the protrusion 20c and adjusting the plate thickness of the fixed electrode 22 to the electrode support plate 23.

In the three-phase movable electrodes 20 and 21, an electrode holding member 24 formed of an insulating material between the contact portions of the connecting shaft 25 and the fixed electrode 22 is movable in the longitudinal direction with respect to the movable electrodes 20 and 21. It is attached. Further, the operating rod 10 is supported by a notch provided in each electrode holding member 24, and is a mechanism that operates in conjunction with three phases.

Both end portions of the operating rod 10 are rotatably supported with respect to the operating rod support plates 11 and 12 fixed to the structure 30.

A link (not shown) is fixed to one end of the operation rod 10 (upper part in FIG. 3).
Since the link is rotatably attached to a motor shaft (not shown), the operation rod 10 performs the operation of inserting and releasing electrodes through the link in accordance with the rotation operation of the motor.

In addition, a detection plate 13 for detecting the open position (see FIG. 5) and the closing position (see FIG. 4) of the electrode portion is held at the other end of the operation rod 10. Further, a sensor 15 (photo interrupter) attached to a control board 15 for performing motor operation and various signal processing is arranged for detecting a cutout portion of the detection plate 13.

FIG. 8 is a view of the detection plate 13 and the sensor 14 fixed to the operation rod 10 in FIG.

The detection plate 13 is a detection plate for detecting the on / off operation of the switch.
The detection plate 13 has a notch at a position corresponding to the open position from the input position of the movable electrodes 20 and 21, and the sensor 14 determines whether the electrode is in a transmissive state or a light-shielded state. Judgment of state and open state.

The state of the detection plate 13 shown in FIG. In the open state, the detection plate 13 rotates clockwise and the sensor 14 detects the notch 13b.

The sensor 14 is attached to the control board 15.
Normally, when the sensor 14 is fixed, a bracket for holding the sensor 14 and a harness for connecting the signal of the sensor 14 to the control board 15 are required. In order to simplify the configuration by omitting them, A device for directly attaching 14 to the control board 15 is devised.

Further, by connecting the operating rod to a motor (not shown) via a link, the movable electrodes 20 and 21 can be automatically turned on and off in accordance with a motor control signal.
As a motor control signal, the lightning protection switch using the electrode device according to the present invention (see FIG. 3) automatically turns off the power of the consumer when a lightning strike is detected, and turns off the power at the time of lightning strike. There are a signal for controlling the motor so as to automatically return, a signal for stopping the motor when the sensor 14 detects the opening position and the closing position of the movable electrode.

Next, the function and effect of the present embodiment will be described.
With the above configuration, even when the center position of the fixed electrode 22 is shifted due to an assembly error or the like, the movable electrodes 20 and 21 and the fixed electrode 22 and the electrode support plate 23 are in the projections 20a and 21b, and the projections 20c and 21c in the electrode input state. In stable contact.

Further, the protrusions 20c and 21c provided on the movable electrodes 20 and 21 serve as fulcrums, and the movable electrodes 20 and 21 move in a fan shape so that the distance between the movable electrodes 20 and 21 does not change. The coil springs 26 a and 26 b thus formed do not bend more than the plate thickness of the fixed electrode 22.

Furthermore, when opened, the distance between the flat portions of the movable electrodes 20 and 21 is set to be equal to or greater than the plate thickness of the fixed electrode 22 to form a guide portion of the fixed electrode 22, and the arcuate shape of the protrusions 20 c and 21 c. The feeding operation can be performed smoothly.

With the switch configuration of the present invention, since it is possible to perform the opening / closing operation with a light load, a large torque is not required for operation of the operating rod 10, so the motor can be downsized and the entire switch can be downsized. It is.

The top view which shows the electrode apparatus of the lightning protection switch which is this invention The partial top view which shows the protrusion of the electrode device which is this invention The top view which shows the lightning protection switch which incorporated the electrode device which is this invention 3 phases Side view showing the electrode device in the charged state Side view showing electrode device in open state Partial sectional view showing a partial cross section of the electrode device in the charged state Partial perspective view showing the inner surface of the movable electrode Side view showing detection plate from P direction (P direction in FIG. 3) Partial top view showing a conventional movable electrode configuration

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Operation rod 11 Operation rod support plate 12 Operation rod support plate 13 Detection plate 14 Sensor 15 Control board 20 Movable electrode 21 Movable electrode 22 Fixed electrode 23 Electrode support plate 24 Electrode holding member 25 Coupling shaft 26 Coil spring 27 Nut
28 Support shaft 30 Structure

Claims (1)

A support shaft (28) is provided at one end of two movable electrodes (20) and (21) made of a long parallel plate, the one end is rotatably held with respect to the electrode support plate (23), and the other end In a switch in which the electric circuit is opened and closed by moving the movable electrode (20), (21) to and away from the fixed electrode (22),
The two movable electrodes (20), (21) are:
With a cross-sectional shape of an approximately U shape,
The connecting shaft (25) is inserted into the center position of the movable electrodes (20) and (21) with respect to the longitudinal direction (L), and the head of the inserted connecting shaft (25) and the outer surface of the movable electrode (21) are inserted. A coil spring (26b) is interposed on the axis of the connecting shaft (25), and a coil spring is interposed between the nut (27) screwing the inserted connecting shaft (25) and the outer surface of the movable electrode (20). (26a) are connected to each other on the axis of the connecting shaft (25), so that they are close to each other,
Arc-shaped protrusions (20a) and (21a) are provided at the contact portion with the fixed electrode (22),
A pair of arcuate protrusions (20c) at a position in contact with the electrode support plate (23) along a direction perpendicular to the longitudinal direction (L) and sandwiching the support shaft (28 ) (20c), (21c) An electrode device for a switch provided with (21c) .