JPH0115035B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention provides a system for quickly detecting fault points such as ground faults and short circuits in power distribution lines by directly suspending them from electric wires so that overcurrent due to accidents or the like passes through the power distribution lines. This relates to the display of an overcurrent passing display device that is sometimes displayed.

Prior Art The present applicant has already installed a display cylinder in the lower part of the main body case as an overcurrent passage display device, stored a colored fluid with viscosity such as oil in the display cylinder, and made it possible to move up and down in the fluid. We are proposing a device with an indicator valve. Then, normally, the display valve is placed close to the display window provided at the bottom of the display cylinder so that it can be clearly seen, and when an overcurrent flows, the display valve is pulled up via an actuating device detected by a current detector, The colored fluid was made visible through the display window to indicate the passage of an overcurrent, and then the vehicle was brought back down by its own weight while resisting the resistance of the fluid.
However, when the display tube and the display valve are viewed from below the main body case, the inside of the display tube is dark, so it is difficult to see the bottom surface of the display valve under normal conditions. When the display valve is pulled up and positioned above the colored fluid, a problem arises in that it is difficult to see the color of the colored fluid below the display valve.

Purpose An object of the present invention is to solve the above-mentioned problems by applying a light reflecting material to at least one of the inner periphery of the lower part of the main body case, the peripheral wall of the display cylinder, and the lower surface of the display valve. An object of the present invention is to provide an overcurrent passage display device that makes it easy to visually recognize the color of colored fluid located below an indicator valve.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 14.

The overcurrent passage display device according to the embodiment of the present invention can be roughly divided into a current detection section A that detects overcurrent, and a display drive section B that is operated by the detection section, as shown in FIG.
, a drive transmission mechanism section H that transmits the driving force of the display drive section B, and a display device I that is operated for display by the drive transmission mechanism section H. Note that the display drive section B and the drive transmission mechanism section H constitute an actuating device.

First, the current detection section A will be explained. This detection section consists of a detection cut core 52 arranged in an annular manner so as to surround the outside of the electric wire l, and a detection current detection coil L wound around the cut core 52. It is comprised of a transformer 53 and a step-up transformer 54 (which may be omitted) connected to the coil L. 55 is a surge absorber connected in parallel to the output side of the step-up transformer 54.

The display drive section B includes a full-wave rectifier 56 connected to the transformer 54, a capacitor C connected to the output side of the rectifier, and a bidirectional trigger diode TD and relay X connected in parallel to the capacitor.
, a variable resistor R that is also connected in parallel to the capacitor C for changing the voltage applied to the capacitor C, a contact Xa of the relay X and a rotary solenoid RS that are also connected in parallel with the capacitor C. It consists of a series circuit of

The rotary solenoid RS has a structure in which the output shaft is rotationally driven when the rotary solenoid RS is energized, and when the excitation is released, the output shaft is rotated back to its original position by a built-in return spring S as an energy storage member. When the terminal voltage of the capacitor C reaches a certain value (for example, when an overcurrent flows), the trigger diode TD becomes conductive and the relay X is activated. As a result, the a contact Xa of the relay X is closed and the rotary solenoid RS is rotated by a predetermined angle (45 degrees in this embodiment) in the driving direction.

Next, the drive transmission mechanism section H will be explained.

57 is a drive gear fixed to the output shaft of the rotary solenoid RS, and 58 is rotatably supported on a bracket 51 attached to the main body case 1 so as to be parallel to the output axis of the gear 57. A driven gear 60 that meshes with the driving gear 57 is fixedly attached thereto.

The ratio of the number of teeth between the drive gear 57 and the driven gear 60 is a constant ratio (in this embodiment, it is 4:
1). 50 is the bracket 5
This is a bearing plate disposed on the opposite side of the driven gear 60 so as to be parallel to the driven gear 60.

Reference numeral 61 denotes a rotating plate which is attached to a shaft 61a on the side of the bracket 51 of the bearing plate 50 so as to be freely rotatable in both directions, and its axis coincides with the axis of the rotating shaft 58. 61b is a V-shaped groove recessed in the lower circumferential surface of the rotating plate 61. 62 is the same rotating plate 61
It is a pin protruding from the lower side surface on the side of the bracket 51, and its tip is provided with a guide slope 62a as shown in FIG. Reference numeral 63 denotes a tripping member whose base end is fixed diagonally above the rotating shaft 58 to the side surface of the rotary plate 61 at the tip of the bracket 51, and the distal end is fixed so as to be diagonally downward and forward. is formed.

Reference numeral 64 denotes an elastic operating lever whose base end is fixed to the rotating shaft 58 so as to be interposed between the rotary plate 61 and the bracket 51, and which projects in the radial direction from the base end, and whose distal end is connected to the puller. It can be engaged with and detached from the lower surface of the detaching member 63 and the pin 62. In the normal state, the operating lever 64 is clamped between the lower surface of the proximal end of the tripping member 63 and the surface of the bracket 51, and is bent slightly toward the bracket 51.

The driving gear 57, driven gear 60, rotating plate 6
1, the pin 62, the tripping member 63, and the operating lever 64 constitute a drive transmission mechanism H.

Next, the display device I will be explained.

Reference numeral 30 shown in FIG. 11 is a bottomed cylindrical display tube made of colorless and transparent synthetic resin provided below the drive transmission mechanism H, and the lower end is expanded via a locking step 31. The outer periphery of the hook portion 32 is screwed into the opening 1a on the lower end surface of the main case 1 so that the lower portion 32a of the hook portion 32 projects from the lower edge of the main case 1.
The locking step 31 is pressed against the O-ring 34 in the annular groove 33 formed on the lower surface of the locking protrusion 2 that protrudes from the inner periphery of the opening 1a of the main body case 1, thereby ensuring watertightness. ing.

Further, the outer periphery of the display tube 30 is colored with a light reflecting material 35 having a high light reflectance such as white, silver, yellow, etc. by means of coating or the like. Note that the light reflecting material 35 may be colored on the inner periphery of the display barrel 30 by means of coating or the like, or may be applied on the inner periphery of the main body case 1.

Reference numeral 36 is a lid made of synthetic resin that is watertightly adhered to the upper end opening of the display tube 30, and has a mounting hole 36a transparent in the center. The mounting hole 36
As shown in FIG. 3, a mounting cylinder 37 is fitted into the mounting cylinder 37, and a tubular magnet 38 having a through hole 38a in the center is fixed inside the mounting cylinder 37. Further, the magnetic fluid 3 is arranged so as to close the through hole 38a of the magnet 38.
9 is placed. The magnetic fluid used is, for example, finely powdered iron oxide with a diameter of about 1/100,000 mm mixed with a liquid such as oil. The hole 38a is sealed.

Reference numerals 40 and 41 indicate a colored fluid (red in this embodiment) with low specific gravity and high viscosity, and a transparent fluid (in this embodiment) with high specific gravity and low viscosity, which are stored in required amounts in upper and lower layers in the display tube 30, respectively. colorless). In addition, the ratio of the specific gravity of both 40 and 41 is
Setting the value to 2.0 or more is desirable because the two-layer separation is stable, but even if the value is 1.5 or more, the longer the standing time is, the better the separation will be, so this setting is also acceptable. Also,
Both fluids 40 and 41 are liquids whose viscosity changes little due to changes in external annular conditions, for example, silicone oil is used as the colored fluid 40, and Fluorinert (Minnesota Mining & MFG) is used as the transparent fluid 41.
Company's proprietary trademark), fluorocarbon oil, and other fluorine-based inert liquids are used to prevent them from mixing with each other.

In the colored fluid 40, there is used a pigment (red in this embodiment) whose specific gravity is equal to or greater than that of the fluid and smaller than the specific gravity of the transparent fluid 41. It is desirable that this pigment dissolves uniformly in the fluid, but if it is allowed to stand still, the colored fluid 4
Even if it precipitates in a layer below the fluid at 0, it does not impair the function of the colored fluid 40 of this embodiment.

42 is a string-like member whose upper end is attached to the circumferential surface of the rotary plate 61 corresponding to the pin 62, and is inserted into the through hole 8a of the magnet, and is always connected to the fluids 40, 4.
The display valve 1 is inserted through a through hole 43a at the center of the valve body 43, and its lower end is engaged with a bead 44 that comes into contact with the lower surface of the valve body 43.

This valve body 43 has flexibility and the colored fluid 40
and a disk-shaped synthetic resin whose specific gravity is higher than that of the pigment and lower than that of the transparent fluid 41, and is fitted with a small gap so as to be movable up and down relative to the inner periphery of the display cylinder. As shown in the figure, a pair of semicircular butterfly valves 46 are integrally formed in a symmetrical manner with a groove 45 recessed in the diametrical direction of the upper surface as a boundary. A pair of regulating plates 47 are respectively protruded from the upper surface of one of the butterfly-shaped valves 46, and the tips of the regulating plates 47 are respectively latched to the upper surface of the other butterfly-shaped valve 46 and rotated through the groove 45. Centered butterfly valve 46
It is impossible to rotate upward, and only downward rotation is possible. Note that the meaning that the butterfly valve 46 cannot be rotated upward does not mean that a slight upward rotation is denied.

Further, the valve body 43 is formed into a conical shape with the center of its lower surface protruding, and the same light reflecting material 35 used for the display tube 30 is applied to the lower surface by means of coating or the like. In a normal state, the valve body 43 floats on the transparent fluid 41 so that its entire lower surface is in contact with the transparent fluid 41, and is positioned with a gap from the bottom 30a of the display cylinder 30 which also serves as a display window.

Note that 65 is a guide portion that guides the string-like member 42 protruding from the lower side surface of the bearing plate 50 so as to be located between the rotary plate 61 and the display device I.

To explain the operation of the overcurrent passage display device configured as above, when a normal load current is flowing through the electric wire I as shown in FIG. The display tube 3 is energized by
The valve body 43 is shown from the bottom 30a of 0.

If an overcurrent flows through the electric wire l due to an accident in this state, a transformed current is generated by the transformer 53 shown in FIG.

When the voltage of the capacitor C reaches a certain value,
Trigger diode TD becomes conductive and relay X
is excited and closes its a contact Xa. As a result, a return spring S equipped with a rotary solenoid RS
When the output shaft is rotated 45 degrees in the driving direction against the elastic force of , the operating lever 64 moves from the position shown by the solid line in FIG. Rotated 180 degrees in the direction of the arrow. At this time, as shown in FIG. 2, the operating lever 64 that has rotated downward comes into contact with the guide slope 62a of the pin 62 of the rotating plate 61 located below the rotating shaft 58, but its elasticity causes it to move toward the bracket 51. The pin 6 bends and slides on the guide slope 62a.
Overcome 2. Note that the operation of the operating lever 64 due to the rotation of the rotary solenoid RS up to this point is instantaneously performed.

Then, the rotary solenoid that has finished rotating
The output shaft of the RS starts to rotate back in the opposite direction, that is, in the counter-driving direction, by the built-in return spring S. As a result, the actuating lever 64 is connected to the drive gear 5.
7. When the driven gear 60 and the rotation shaft 58 rotate from the position shown by the chain line in FIG. The string member 42 is then rotated in the opposite direction to wind up the string member 42. Therefore, the display device I is pulled upward through the string member 42 while resisting the gravity of the valve body 43 and the viscous resistance of the fluids 40 and 41.

At this time, the valve body 43 is connected to the butterfly valve 46 as shown in FIG.
is rotated while being bent downward, and the entire body is moved into the colored fluid 40.

Furthermore, when the actuating lever 64 is rotated in the counter-driving direction, the tip of the actuating lever 64 comes into contact with the tripping member 63, and then slides while being pressed against the tripping member 63, so that its elasticity causes the bracket to close. The tripping member 6 is bent while being bent toward the 51 side.
The return operation is completed at the proximal end of 3. At this time, the valve body 43 of the display device I is positioned above the colored fluid 40 as shown in FIG. 13 to display an overcurrent passage display.
The color of the colored fluid 40 can be visually recognized through the bottom 30a of the display tube 30. Note that when viewed from the side of the lower part of the display tube 30, the colored fluid 40 cannot be directly seen because the hook 32 is in the way;
Since the color of 0 is diffusely reflected, the overcurrent passing display can be confirmed by the coloration of the portion 32a. Furthermore, when the hook portion 32 is made to have the same diameter as the display tube 30, the same effect can be achieved, and the overcurrent passage display can be confirmed.

On the other hand, when the operating lever 64 is bent, the ninth
As shown in the figure, the pin 62 of the rotating plate 61 is removed from the operating lever 64. Then, as shown in FIG. 14, the valve body 43 of the display device I begins to descend due to its own weight, is delayed by the viscous resistance of the colored fluid 40, returns to the bottom after a predetermined period of time, and becomes a normal display. During this downward movement, since the lower surface of the valve element 43 is formed into a conical shape, the colored fluid 40 on the lower surface of the valve element 43 flows upward along the oblique lower surface, so that the valve element 43 floats on the upper surface of the transparent fluid 41. When the valve body returns to normal, the colored fluid 40 having a light specific gravity does not remain on the lower surface of the valve body 43.

On the other hand, as shown in FIG.
is returned below the rotating shaft 58.

This overcurrent passage display device is coated with a light reflecting material 35 having a high light reflectance such as white, silver, yellow, etc. on the outer periphery of the display tube 30 and the lower surface of the valve body 43, so that the colored fluid 40 is transmitted through it. When the light is reflected by the light reflecting material 35 and viewed from below the display tube 30, the color of the colored fluid 40 can be clearly seen.

Note that the present invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of the present invention.

Effects As detailed above, the present invention includes a display tube made of a transparent material attached to the lower part of the main body case, a fluid stored in the display tube, and a display valve connected to an actuating device stored in the fluid. An overcurrent passage display device which is equipped with a 1000V, and when an overcurrent occurs, the indicator valve is pulled up via the actuating device to indicate the passage of the overcurrent, and after the overcurrent is resolved, the indicator valve is lowered with a delay due to its own weight to perform a recovery operation. By applying a light-reflecting material with high light reflectivity such as white, silver, or yellow to at least one of the inner periphery of the lower part of the main body case, the peripheral wall of the display cylinder, and the lower surface of the display valve, the display valve and the lower part of the display valve This has an excellent effect of making it easier to visually recognize the color of the colored fluid located there.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing a current detection section, a display drive section, and a drive transmission mechanism section of an overcurrent display device showing an embodiment of the present invention, and FIG. 2 is a rotating plate of the drive transmission mechanism section. Explanatory diagram showing the pins, 3rd
The figure is a central sectional view of the lid of the display tube, FIG. 4 is a central sectional view of the indicator valve, FIG. 5 is a partially sectional perspective view, and FIG. 6 is a normal state position of the operating lever of the drive transmission mechanism. Fig. 7 is a perspective view of the operating lever rotated 180 degrees from the state shown in Fig. 6 and locked to the pin, and Fig. 8 is a perspective view of the state in which the rotating plate is driven by the operating lever from the state shown in Fig. 7. Perspective view of the state in which
The figure is a perspective view of the pin of the rotating plate detached from the operating lever after the state shown in Fig. 8, and Fig. 10 shows the rotating plate being urged by the operating member and rotating from the state shown in Fig. 9. Fig. 11 is a sectional view of the display device with the indicator valve in the normal state, Fig. 12 is a sectional view of the display device with the indicator valve in the raised state, and Fig. 13 is a sectional view of the display device in the overcurrent passage display state. 14 is a cross-sectional view of the display device in a lowered state. Display tube...30, light reflective material...35, fluid...40,
41, Actuating device...B, H, Valve body (display valve)...4
3.

Claims (1)

[Claims] 1. A display cylinder made of a transparent material is installed in the lower part of the main body case, a fluid is stored in the display cylinder, and a display valve connected to an actuating device is disposed within the fluid, and when an overcurrent occurs, the display cylinder is activated. In the overcurrent passage display device, which indicates the passage of overcurrent by pulling up the indicating valve through the device, and then performs a recovery operation by lowering the indicating valve with its own weight with a delay after the overcurrent is resolved, An overcurrent passage display device, characterized in that at least one of the lower surfaces of the display valve is coated with a light reflecting material having a high light reflectance, such as white, silver, or yellow.