JPH0115034B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical field This invention is designed to quickly detect faults such as ground faults and short circuits in power distribution lines by suspending them directly from electric wires so that overcurrent caused by accidents or the like can cause damage to the power lines. This invention relates to an overcurrent passage display device that displays when an overcurrent has passed.

Prior Art The present applicant has already installed a display tube 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 tube, and made it possible to move up and down in the fluid. We are proposing one with an indicator valve. This overcurrent passage display device normally places the display valve close to the display window provided at the bottom of the display tube so that it can be clearly seen, and when an overcurrent flows, the display valve is placed in close proximity to the display window provided at the bottom of the display tube, and when an overcurrent flows, the display valve is placed in the vicinity of the display window provided at the bottom of the display tube, and when an overcurrent flows, the display valve is placed in the vicinity of the display window provided at the bottom of the display tube, and when an overcurrent flows, the display valve is placed in close proximity to the display window provided at the bottom of the display tube, and when an overcurrent flows, the display valve is placed in the vicinity of the display window provided at the bottom of the display tube. The indicator valve was pulled up and the colored fluid was made visible through the display window to indicate the passage of an overcurrent, and then the indicator was lowered with a delay due to its own weight while resisting the resistance of the colored fluid and returned to its original state.

However, if the lower surface of the bottom of the display tube, which also serves as a display window, is formed into a convex lens shape with a protruding center, for example, the colored fluid below the display valve can be viewed from directly below the display tube when performing an overcurrent passage indication. However, there is a problem in that when viewed from a slightly diagonal downward direction, it becomes difficult to see clearly due to reflection. In addition, if the bottom of the display cylinder is simply formed into a flat shape, the visible range of the colored fluid will be wider than when it is formed into a convex lens shape, but when viewed from the side, it will not be visible and overcurrent will pass through. There was a problem in that it was difficult to confirm whether or not the display was being performed. Also,
Since the display window is provided at the bottom of the device, there is a risk that the bottom is easily damaged when the device is transported and handled.

Purpose The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to provide an overcurrent passage indication in which the device displays an overcurrent passage indication not only when viewed from directly below the display tube, but also when viewed from considerably to the side and from below. To provide an overcurrent passage display device which can easily confirm whether or not the overcurrent passage display is being carried out, thereby expanding the visible range of the overcurrent passage display, and which is less likely to cause damage to the bottom of the display cylinder when the device is transported and handled. It is in.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 11.

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 return spring S that is an internal 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).

Reference numeral 50 denotes a bearing plate 6 disposed on the opposite side of the driven gear 60 so as to be parallel to the bracket 51.
Reference numeral 1 denotes a rotating plate having a shaft 61a attached to the bracket 51 side of the bearing plate 50 so as to be freely rotatable in both directions, and the center of the shaft 61a 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 6
It is a pin protruding from the lower side surface on the bracket 51 side of No. 1, 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. 8 is a cylindrical display tube with a bottom made of colorless and transparent synthetic resin, which is provided below the drive transmission mechanism H, and the lower surface of the bottom 30a is formed in a flat shape, and the lower part of the peripheral wall From the locking step part 31
A hook portion 32 with an enlarged diameter is provided to protrude downward through the hook portion 32, and a lower portion 32a of the hook portion 32 is attached to the main body case 1.
The outer periphery of the hook portion 32 is screwed into the opening 1a of the lower end surface of the main case 1 so as to protrude from the lower end edge of the hook portion 32. 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 glued to the upper end opening of the display tube 30, and a mounting tube 37 is inserted and fixed in the center, and a tubular magnet is arranged inside the mounting tube 37. At the same time, the magnetic fluid 39 is arranged so as to close the inside of the mounting tube 37 .

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 it to 2.0 or more is desirable because the two-layer separation is stable, but even if it is 1.5 or more, the longer the standing time is, the better the separation will be, so this is also acceptable.

Reference numeral 42 denotes 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 mounting tube 37, and is always connected to the fluid 40,
The lower end of the bead 44 is inserted into a through hole 43a at the center of a valve body 43 as an indicator valve located inside the display valve 41 and 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 41
It is made of a disk-shaped synthetic resin whose specific gravity is higher than that of the pigment and lower than that of the transparent fluid 40, and is fitted with a small gap so as to be movable up and down with respect to the inner periphery of the display cylinder, and in the diametrical direction of the upper surface. A pair of semicircular butterfly-shaped valves 46 are integrally formed in a symmetrical manner with a groove 45 recessed in the center as a boundary. And groove 4
The butterfly-shaped valve 46 cannot be rotated upwards about the rotation center at the 5th part, and is only allowed to rotate downwardly.

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 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 due to its elasticity, it bends toward the bracket 51. The pin 6 is bent while sliding 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 are rotated from the position shown by the chain line in FIG. The string member 42 is 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 rotated while the butterfly valve 46 is bent downward as shown in FIG.
Moved to 0.

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. 10 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.

On the other hand, when the operating lever 64 is bent, the sixth
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. 11, 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.

On the other hand, as shown in FIG. 7, the rotary plate 61 is pulled by the valve body 43 via the string member 42 to return the pin 62 below the rotary shaft 58.

This overcurrent passage display device, which operates as described above, can be seen from the bottom 30 when viewed from directly below the display tube 30.
The color of the valve body 43 serving as an indicator valve or the colored fluid 40 can be visually recognized through a. When viewed from the side of the display tube 30, the hook portion 32
Although the colored fluid 40 cannot be seen directly because of the obstruction, when the valve body 43 is pulled up, the valve body 43 is exposed to the lower part 32a of the transparent hook portion 32.
Since the color of the colored fluid 40 located below is diffusely reflected, the passing of an overcurrent can be confirmed by the coloring of the colored fluid 40. As a result, the visible range of the display state is greatly expanded compared to the conventional case where the bottom portion of the display tube, which also serves as the display window, is simply formed into a flat shape without the hook portion 32a.

Further, since the display tube 30 has a hook portion 32 whose diameter is enlarged via a locking step portion 31, the amount of fluids 40, 41 used can be reduced.

Furthermore, the hook portion 32 is located at the bottom 30a of the display tube 30.
Since the overcurrent passage display device is located below the display window, the bottom portion 30a serving as the display window does not come into direct contact with the floor surface when transporting the overcurrent passage display device, thereby preventing the bottom portion 30a from being scratched by contact.

Next, another example will be explained with reference to FIG. In this embodiment, the hook portion 32 of the display tube 30 is made not to protrude from the lower edge of the main body case 1, and a light reflecting material 35 of white or the like is applied to the inner periphery of the lower end portion of the main body case 1 corresponding to the hook portion 32. . By doing this, the colored fluid 4 in the hook portion 32
0 is colored by diffused reflection, but when the viewer looks from the lower side where the bottom of the display tube 30 cannot be seen, the coloring state of the inner periphery of the hook 32, which is farther away from the viewer, can be seen. The display state can be confirmed by visually checking.

Note that this invention is not limited to the above-mentioned embodiments, and may be arbitrarily modified without departing from the spirit of the invention, such as making the hook portion 32 the same diameter as the display tube 30 and attaching it to the main body case 1. It is also possible to do so.

Effects As described in detail above, the present invention forms the lower surface of the bottom of the display tube in a planar shape and also provides a hook portion that protrudes downward from the bottom circumferential wall, so that it can be used not only directly below the display tube but also on the lower side. You can easily check whether or not the device is displaying an overcurrent passage when viewed from the side, thus increasing the visible range of the overcurrent passage indication, and also preventing the bottom of the display tube from being scratched during transportation. It produces excellent effects that are difficult to use.

[Brief explanation of drawings]

FIG. 1 shows a current detection unit, a display drive unit, and
An electric circuit diagram showing the drive transmission mechanism section, FIG. 2 is an explanatory diagram showing the pins of the rotary plate of the drive transmission mechanism section,
FIG. 3 is a perspective view showing the normal state position of the operating lever of the drive transmission mechanism; FIG. 4 is a perspective view of the operating lever rotated 180 degrees from the state shown in FIG. 3 and locked to the pin; Figure 5 is a perspective view of the state in which the rotary plate is driven by the operating lever from the state shown in Figure 4, and Figure 6 is a perspective view of the state in which the pin of the rotary plate has separated from the operating lever after the state shown in Figure 5. Figure 7 is a perspective view of the state in which the rotary plate is rotated by the actuating member from the state shown in Figure 6, and Figure 8 is a sectional view of the display device in which the display valve normally displays; Figure 9 is a cross-sectional view of the display device with the indicator valve in the raised state, Figure 10 is a cross-sectional view of the display device in the overcurrent passage display state, Figure 11 is a cross-sectional view of the display device in the lowered state, and Figure 12 is separate. FIG. 2 is a cross-sectional view of a display device showing an example. Display cylinder...30, frame part...32, 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 attached to the lower part of the main body case, a colored fluid is stored in the display cylinder, and a display valve can be moved up and down through an actuator inside the colored fluid. and when an overcurrent occurs, the indicator valve is pulled up via an actuating device to indicate the passage of an overcurrent,
In an overcurrent passage display device that performs an indicating operation by delaying the display valve down by its own weight after the overcurrent is resolved, the lower surface of the bottom of the display tube is formed into a flat shape, and a hook portion is provided that protrudes downward from the bottom peripheral wall. An overcurrent passage display device characterized by: 2. The overcurrent passage display device according to claim 1, wherein the hook portion has a diameter larger than the bottom portion from the bottom peripheral wall via the locking step portion. 3. Claim 1 or 2, characterized in that the hook protrudes from the lower edge of the main case.
Overcurrent passing indicator device as described in .