JPS637607B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention is intended to quickly detect 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 lines. This relates to the display valve of the overcurrent passage display device that sometimes displays this.

Prior Art The applicant of the present invention has already constructed an overcurrent passage display device in which a colored fluid 81 having a viscosity such as oil and having a low specific gravity and a transparent fluid 82 having a high specific gravity are arranged in upper and lower layers in a display tube 80 as shown in FIG. It is proposed that the fluids 81 and 82 be stored in a separate state, and an indicator valve 83 that can move up and down is disposed in the fluids 81 and 82. Note that the display valve 83 has a gap of 0.25 mm with the display cylinder 80, for example.
It is narrowed to a certain extent. Further, as shown in FIG. 19, this indicator valve 83 was a pair of butterfly-shaped valves 84a and 84b which were integrally formed of synthetic resin and which were rotatable downwardly about the diameter line P. and,
The display valve 83 is disposed entirely in the transparent fluid 82 or at least with its lower surface in contact with the transparent fluid 82 so that it can be clearly seen through the display window 80a provided at the bottom of the display cylinder 80 under normal conditions. In addition, when an overcurrent flows, the display valve 83 is pulled up into the colored fluid 81 via a display drive unit or the like that is detected by a current detector (not shown), and the display window 80a
The colored fluid 81 is then made visible to indicate the passage of an overcurrent, and then the fluid 81 is slowly lowered by its own weight while resisting the viscous resistance, and then returned to its original state.
On the other hand, when the butterfly-shaped valves 84a and 84b of the display valve 83 are pulled up, they bend and rotate downwards in a bi-fold shape about the diameter line P, and when they fall under their own weight, their own elasticity and fluid The rotation was restored due to the viscous resistance of 81.

However, the indicator valve 8 of this overcurrent passage indicator device
3, the display tube 80 remains slightly folded in half as shown in FIGS. 20 and 21 when it descends under its own weight after rising
In some cases, the vehicle tilted relative to the vehicle and fell under its own weight.

For example, the following may be considered as the cause of this double-folded shape.

(a) Due to the incomplete elasticity of the synthetic resin forming the indicator valve 83, the butterfly valves 84a and 84b do not completely return to rotation when they fall under their own weight.

(b) Immediately after the indicator valve 83 finishes rising, the butterfly shape 84a,
Before 84b completely returns to rotation, it begins to fall under its own weight.

In addition, the following may be considered as the cause of the relative inclination of the display valve 83 with respect to the display tube 80, for example.

(1) The overcurrent passing indicator device is not suspended vertically from the wire.

(2) An overcurrent passing indicator suspended from a power line sways due to wind pressure.

(3) Due to the difference in viscous resistance acting on each butterfly valve during the ascent, the display valve tilts immediately after the ascent ends.

(4) The display valve tilts due to the difference in viscous resistance acting on each butterfly valve during its own weight descent.

(5) Due to manufacturing errors, the center of gravity, surface area, etc. of each butterfly valve are different from each other, so they are unbalanced from the beginning.

Due to the combination of various causes such as (a), (b), and (1) to (5) above, the indicator valve 83 is tilted with respect to the indicator tube 80 while remaining in a slightly folded shape. When the display valve 83 is tilted with respect to the display cylinder 80 as described above, both outer circumferences on the diameter line P of the display valve 83 are connected to the display cylinder 80.
There is an extremely narrow gap between the inner periphery of the display valve 80 and the display valve 83 (butterfly valve 84).
Since the outer peripheries of the valves a and 84b have a relatively wide gap, the indicator valve 83 is likely to lose its balance around the diameter line P as the center of rotation. As a result, when the indicator valve 83 falls under its own weight, the butterfly valve 84a has a deeper inclination with respect to the perpendicular direction than the butterfly valve 84b.
Therefore, since the viscous resistance acting on the butterfly valve 84b is greater than that of the butterfly valve 84a, the indicator valve 83 rotates about the diameter line P and the inclination of the indicator valve 83 increases, causing the indicator valve 83 to quickly move toward the colored fluid 81. Sediment inside. Therefore, there was a problem that the indicator valve 83 displayed the steady state in a shorter time than the desired return operation time.

Purpose An object of the present invention is to solve the above-mentioned problem, to suppress the tilting of the indicating valve of the overcurrent passage indicating device even if the indicating valve is tilted, and to ensure that the indicating valve returns to the desired return time. An object of the present invention is to provide an indicator valve for an overcurrent passing indicator device that can be used.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 17.

In the drawings, reference numeral 1 denotes a cylindrical main body case made of synthetic resin, which is constructed by hingedly attaching a lower case 3 to the lower outer periphery of an upper case 2. Reference numeral 3a denotes an annular locking projection protruding from the inner periphery of the lower end opening 3b of the lower case 3.

Reference numeral 4 denotes an annular locking step portion projecting inward from the inside of the lower part of the upper case 2, and 5 denotes a disc-shaped locking plate attached to the locking step portion 4 with screws 4a. It is formed to be slightly smaller than the inner diameter of the case 2, and has an insertion hole 5a formed in the center thereof. Reference numeral 6 denotes four screw holes recessed at equal distances from each other on the upper surface of the peripheral wall of the upper case 2, and 7 is an annular protrusion protruding from the upper surface of the upper case 2.
The case 2 is curved inward at four places to avoid this.

Reference numeral 8 shown in FIG. 2 is a disc-shaped lid made of weather-resistant insulating material such as rubber, which is attached to the upper surface of the upper case 2, and has a fitting shape narrower than the width of the protrusion 7. Watertightness is ensured by providing a groove 8a on the lower surface and fitting it into the protrusion 7, and tightening bolts 9 screwed into each of the screw holes 6 through the bolt holes 8b.

Reference numeral 12 denotes a mounting portion projecting upward from the top surface of the lid body 8, which extends in the diametrical direction and has a hooking recess 12a formed in the center of the top surface with an arcuate cross section. Reference numeral 13 denotes an inverted U-shaped upper core case that is removably attached to the upper surface of the attachment part 12 so as to straddle the clamping recess 12a, and is made of an insulating material such as weather-resistant rubber. There is. Reference numeral 14 denotes an inverted U-shaped upper core made of a magnetic material that is inserted when the upper core case 13 is molded, and 15 is a U-shaped lower core made of a magnetic material that is inserted into the attachment part 12 when the lid body 8 is molded. The core constitutes a detection cut core 16 that is formed in an annular shape so as to surround the outside of the electric wire 1 in the assembled state together with the upper core 14 . L is a coil wound around the lower core 15, and together with the detection cut core 16 constitutes a detection current transformer 17.

A tapered recess 13a is formed on both lower end surfaces of the upper core case 13 along the outer edge of the cut surface 14a of the upper core 14 and becomes wider toward the bottom.
Tapered protrusions 12b are formed on the upper surface of the mounting portion 12 and are tightly fitted into the recesses 13a, thereby preventing rainwater from entering through a wedge effect.

Reference numeral 18 denotes a presser plate whose central portion is integrally molded within the upper part of the upper core case 13, and each end thereof projects from both sides of the upper core case 13 in the longitudinal direction. Reference numeral 18a denotes an insertion hole formed through one end of the presser plate 18, and reference numeral 18b denotes a locking recess formed by a cutout from one side of the other end of the presser plate 18.

Reference numeral 19 denotes a fastening member implanted in the lower part of the mounting portion 12 of the lid body 8, and as shown in FIG. They are welded together and threaded portions 19c provided at the tips protrude from the upper surface of each side of the mounting portion 12 in the longitudinal direction. Then, by inserting each screw portion 19c into the insertion hole 18a and the locking recess 18b of the holding plate 18, and screwing the wing nut 20 from the upper surface of the holding plate 18, the upper core case 13 is attached to the mounting portion 12. The upper core 14 and the lower core 15 of the detection cut core 16 are fastened and fixed to each other so that the cut surfaces 14a and 15a of the detection cut core 16 are pressed into close contact with each other.

Reference numeral 21 denotes a spring washer interposed between each end of the holding plate 18 and each wing nut 20. 2
Reference numeral 2 denotes a reverse channel-shaped retaining plate interposed between the end of the holding plate 18 on the locking recess 18b side and the spring washer 21;
The tip of the bolt 9b is inserted, and the hanging portions 22a at both ends engage with both sides of the holding plate 18, and the bolt 1 is inserted during assembly.
9b is prevented from separating from the locking recess 18b in the horizontal direction.

23 is the upper core case 13 as shown in FIG.
It is a clamp member made of an elastic material that is removably attached to a mounting recess 24 formed in the center of the lower surface of the mounting recess 24, and is provided on both sides of the upper end surface with respect to locking steps 24a formed on both sides of the lower surface of the mounting recess 24. A locking protrusion 23a protruding from the edge can be locked.
Reference numeral 23b is a fitting recess that is recessed in the lower surface of the clamp member 23 and has an arcuate cross section along the wire insertion direction. Then, the electric wire l is inserted between the clamping recess 23b and the clamping recess 12a of the mounting part 12, and the bolt 19b
The upper core case 1 is secured by the wing nut 20 screwed into the
3, the clamp member 23 is pressed downward and clamped between the two 12a and 23b. Reference numeral 25 denotes a protective cover made of synthetic resin in the shape of a square cylinder with a lid and formed to cover the upper part of the bolt 19b and the entire upper core case 13, and has a locking protrusion 25a protruding inward on the lower edge of the peripheral wall. It can be attached by engaging with a locking groove 26 that is recessed around the entire circumference of the attachment portion 12 .

By the way, 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 an overcurrent, a display drive section B operated by the detection section, and the display drive section as shown in FIG. The display device I is configured by a drive transmission mechanism section H that transmits the driving force of B, and a display device I that is operated for display by the drive transmission mechanism section H.

Therefore, first, the current detection section A will be explained. This detection section consists of the above-mentioned detection current transformer 17.
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 secondary 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 a relay connected in parallel to the capacitor.
A series circuit of CR, a variable resistor R that is also connected in parallel to the capacitor C and for changing the voltage applied to the capacitor C, a contact CRa of the relay CR that is also connected in parallel with the capacitor C, and a rotary solenoid. It consists of a series circuit of RS.

As shown in FIG. 1, the rotary solenoid RS is fixed to a vertical portion 5b protruding upward from one side edge of the locking plate 5, and when it is energized, the output shaft is rotationally driven, and when the excitation is released, the rotary solenoid RS is installed inside. The output shaft is configured to be rotated back to its original position by a return spring S serving as an energy accumulating 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 CR is activated. As a result, the a contact CRa of the relay CR is closed to rotate the rotary solenoid RS by a predetermined angle (45 degrees in this embodiment) in the driving direction.

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

Reference numeral 50 denotes an L-shaped bearing plate which is attached with screws 50a on the locking plate 5 parallel to and opposite to the vertical portion 5b, and is arranged such that the insertion hole 5a is positioned between the vertical portion 5b and the vertical portion 5b. I have to. Reference numeral 51 denotes a square-shaped bracket protruding from the upper vertical portion 5b of the coaxial bearing plate 50, the base end of which is attached to the bearing plate 50 with a screw 51a, and the tip thereof parallel to the bearing plate 50.

Note that 52 indicates the upper part of the vertical portion 5b and the bracket 51.
This is a spacing plate with both ends fixed to the upper part.

57 is a drive gear fixed to the output shaft of the rotary solenoid RS; 58 is a rotation shaft whose both ends are rotatably attached between the vertical portion 5b and the bracket 51; A driven gear 60 that meshes with 57 is fixedly attached.

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 61 denotes a rotating plate having a shaft 61a attached to the side of the vertical portion 5b 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. The lower center of the circumferential surface corresponds to the insertion hole 5a. 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 vertical portion 5b, and its tip is provided with a guide slope 62a as shown in FIG. 63 is bracket 51
It is a tripping member whose base end is fixed obliquely above the rotating shaft 58 with respect to the rotating plate side surface of the distal end, and the distal end is formed so as to descend diagonally downward and forward. .

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 addition, in the normal state, the actuating lever 64 is clamped between the lower surface of the proximal end of the tripping member 63 and the surface of the bracket 51, so that the slightly vertical portion 5
It is bent towards the b side.

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 is a bottomed cylindrical display tube made of colorless and transparent synthetic resin provided below the drive transmission mechanism H, and the lower end has a hook portion 32 whose diameter is enlarged via a locking step portion 31. The outer periphery of the hook portion 32 is screwed into the opening 3b of the lower case 3 such that the lower portion 32a of the hook portion 32 protrudes from the lower edge of the lower case 3. The locking step portion 31 is an annular groove 33 recessed in the lower surface of the locking protrusion 3a.
Watertightness is ensured by being pressed against the inner O-ring 34.

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.

Reference numeral 36 denotes a synthetic resin lid that is watertightly adhered to the upper end opening of the display tube 30, and has an attachment hole 36 in the center corresponding to the insertion hole 5a of the locking plate 5.
A is transparent. As shown in FIG. 5, a mounting cylinder 37 is fitted into the mounting hole 36a, and a tubular magnet 38 having a through hole 38a in the center is fixed inside the mounting cylinder 37. Furthermore, the magnet 38
A magnetic fluid 39 is arranged so as to close the through hole 38a. 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 (in this example, red) with low specific gravity and high viscosity and a transparent fluid (in this example) with high specific gravity and low viscosity, which are stored in the display tube 30 in required amounts in upper and lower layers, 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 set to 1.5 or more, the longer the standing time is, the better the separation will be, so this setting is also acceptable.

Reference numeral 42 denotes a string-like member as an operating member whose upper end is engaged with the circumferential surface of the rotary plate 61 corresponding to the pin 62, and is inserted into the insertion hole 5a of the locking plate 5 and the through-hole 38a of the magnet, In addition, the fluid 40,
The lower end of the bead 44 is inserted into a through hole 47b 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.

As shown in FIG. 7, this valve body 43 is made of synthetic resin fan-shaped valve pieces 46 which are made by equally dividing a disc into an odd number (three in this embodiment) and disposing them at a predetermined distance Q from each other. and a thin circular connection made of a flexible synthetic resin material such as flexible polyvinyl chloride, whose outer periphery is aligned with the arc-shaped peripheral surface of the fan-shaped valve piece 46 and affixed to the upper surface of each fan-shaped valve piece 46. It is composed of a member 47. Note that 47b is a through hole provided in the center of the connecting member 47. And the same valve body 43
is internally movable up and down with respect to the inner periphery of the display tube 30 with a small gap (0.25 mm in this embodiment), and serves as a connecting member provided between each of the fan-shaped valve pieces 46 in the connecting member 47. Flexible part 4
By bending downward at 7a, each sector-shaped valve piece 46 can be rotated downward about the center of the valve body 43. When the fan-shaped valve piece 46 is rotated so that the center portion is upward and the outer circumferential portion is downward, the amount of rotation is always kept constant by abutting against the circumferential sides of other opposing fan-shaped valve pieces 46. ing. Note that this amount of rotation can be set to a desired amount by changing the interval Q. 45
is a groove recessed in the outer periphery of each sector-shaped valve piece 46.

Further, the specific gravity of the synthetic resin forming the fan-shaped valve piece 46 and the connecting member 47 is appropriately selected so that the specific gravity of the valve body 43 is higher than that of the colored fluid 41 and lower than that of the transparent fluid 41. Here, there is a display tube 30 that floats on the transparent fluid 41 so that its entire lower surface is in contact with the transparent fluid 41, and that also serves as a display window.
It is positioned so as to have a gap between it and the bottom 30a.

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 17 shown in FIG.

When the voltage of the capacitor C reaches a certain value,
Trigger diode TD becomes conductive and relay
CR is energized and its a contact CRa is closed. As a result, the rotary solenoid RS moves its output shaft in the driving direction against the elastic force of the internal return spring S.
When rotated, the actuating lever 64 is connected to the drive gear 57,
It is rotated 180 degrees in the direction of the arrow via the driven gear 60 and the rotation shaft 58 from the position shown by the solid line in FIG. 8 to the position shown by the chain line. At this time, as shown in FIG.
a, but due to its elasticity, the bracket 51
It bends to the side and climbs over the pin 62 while sliding on the guide slope 62a. 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 then rotated in the opposite direction to wind up the string member 42. Therefore, the valve body 43 of the display device I is pulled upward through the string member 42 while resisting the gravity and the viscous resistance of the flows 40 and 41.

At this time, the valve body 43 is inserted into the fan-shaped valve piece 4 as shown in FIG.
6 is rotated by a certain amount while being bent downward at the bending part 47a, and the whole 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. 14 to display an overcurrent passage.
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 first
As shown in Figure 1, from the operating lever 64 to the rotary plate 61
The pin 62 is removed. Then, as shown in FIG. 15, the valve body 43 of the display device I begins to descend due to its own weight, and due to the viscous resistance of the colored fluid 40, each fan-shaped valve piece 46 rotates upward and returns to a horizontal state.
Further, the colored fluid 40 below the valve body 43
A labyrinth effect occurs in which the groove 45 enters the relatively wide groove 45 of the fan-shaped valve piece 46 from the very narrow gap between the valve body 43 and the display tube 30, and then moves upward from the narrow gap between the valve body 43 and the display tube 30. The valve body 43 is delayed and lowered due to the viscous resistance of the fluid 40, and after a predetermined period of time returns to float on the transparent fluid 41, resulting in a normal display.

On the other hand, as shown in FIG. 12, the rotating plate 61 is pulled by the valve body 43 via the string member 42,
is returned below the rotating shaft 58.

Note that when the valve body 43 finishes rising, the valve body 43
When each of the fan-shaped valve pieces 46 does not completely return to its original state and begins to fall due to its own weight while remaining slightly bent downward as shown in FIG. 16 due to the various causes mentioned above, as shown in FIG. The outer edge X of the bending portion 47a as shown in FIG.
Y and Z have extremely narrow gaps with respect to the display tube 30. On the other hand, since the gap between the central outer circumference of each sector-shaped valve piece 46 and the display cylinder 30 is relatively wide, the outer edges X, Y, and Z of the bending portion 47a are larger than the outer circumference of the sector-shaped valve piece 46. It can easily come into contact with the display tube 30. If the valve body 43 is tilted for some reason and, for example, the outer edge moves downward, so the inclination of the valve body 43 is reduced. Subsequently, when any of the other outer edges Y and Z is located below, the same operation as in the case of the outer edge X is performed.

For example, if the two outer edges X and Y tilt downward at the same time, the display tube 3 will move slightly in the tilt direction.
However, since the center of gravity of the valve body 43 is located above the line connecting the outer edges X and Y, the outer edges X and Y
The center of gravity of the valve body 43 moves downward using the contact point between the display cylinder 30 and the display tube 30 as a fulcrum, and the inclination of the valve body 43 is reduced. For this reason, unlike the conventional bifold-shaped display valve, once it starts to tilt, the tilt increases and the valve body 43 does not descend quickly due to its own weight, but the valve body 43 descends while ensuring a predetermined delay time and returns to its original position. Return to.

In addition, in this embodiment, the display valve is formed from a sector-shaped valve piece that is a disk divided into three parts, but the sector-shaped valve piece is made up of five parts.
The same effect can be obtained even if the image is divided into odd numbers such as division or seven divisions.

Next, a second embodiment will be explained according to FIG. 22.

In this embodiment, in the configuration of the first embodiment, a valve body 43 serving as an indicator valve is disposed at a distance Q from each other. The connecting members 47 are attached to each other, and the connecting members 48 for engaging the beads 44 are connected to the upper surfaces of the mutually opposing inner ends of the fan-shaped valve pieces 46.
The difference is that a through hole 48a through which a string member 42 is inserted is provided in the center.

By doing this, the connecting member 47 and the connecting member 4
A gap G can be provided between 8 and 8, and by adjusting the gap G, the delay time for the valve body 43 to fall into the fluid can be adjusted.

Next, a third embodiment will be explained with reference to FIG. 23. This embodiment is based on the valve body 4 of the first embodiment.
The difference is that the connecting member 47 of No. 3 is formed in a Y shape and is attached and connected to each fan-shaped valve piece 46 so as to cover each interval Q. By doing so, the weight of the connecting member 47 can be reduced to make the valve body 43 lighter, and the delayed descent time in the fluid can be extended.

Although not directly related to the present invention, it is conceivable that the indicator valve is constructed of a sector-shaped valve piece that is divided into four or more equal parts, and a flexible connecting member that connects each sector-shaped valve piece. However, as in the case of dividing into two equal parts in the conventional example, a bending part in the diametrical direction passing through the center of the display valve is formed, and when rising, the valve body is divided into two parts at the bending part in the same diametrical direction. Since it is bent downward and rotated, the inclination increases and the weight drops quickly for the same reason as in the conventional example, which causes a problem.

Note that equal division in this invention does not mean completely equal division, but also includes unequal division with some deviation.

Effects As described in detail above, the present invention stores a fluid in an indicator cylinder, and provides a circular indicator valve disposed within the fluid so as to have a certain gap between the fluid and the inner periphery of the indicator cylinder. is connected to an operating member, and when an overcurrent occurs, the indicator valve is pulled up via the operating member to indicate the passing of the overcurrent, and after the overcurrent is resolved, the indicator valve is delayed to lower due to its own weight to display the overcurrent for a certain period of time. In the current passage display device, the indicator valve has fan-shaped valve pieces divided into an odd number of pieces, which are connected by a flexible connecting member, and the indicator valve can be rotated slightly by the connecting member when the indicator valve is raised. As a result, even if the display valve is tilted, the tilt of the display valve can be suppressed, and therefore the display valve can be reliably returned to the desired return time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment embodying the present invention, FIG. 2 is an exploded perspective view of the upper part of the overcurrent display device, and FIG. 3 is a current detection section and display drive of the overcurrent display device. Figure 4 is an explanatory diagram showing the pins of the rotary plate of the drive transmission mechanism, Figure 5 is a central sectional view of the lid of the display tube, and Figure 6 is the display valve. , FIG. 7 is an exploded perspective view, FIG. 8 is a perspective view showing the normal position of the operating lever of the drive transmission mechanism, and FIG. 9 shows the operating lever rotated 180 degrees from the state shown in FIG. 8. FIG. 10 is a perspective view of the state in which the rotating plate is driven by the operating lever from the state in FIG. 9, and FIG. 11 is a perspective view after the state in FIG. 10. A perspective view of a state in which the pin of the rotary plate is detached from the operating lever, FIG. 12 is a perspective view of the state in which the rotary plate is rotated by the actuation member from the state shown in FIG. 11, and FIG. 13 is a display. A cross-sectional view of the display device with the valve in the raised state;
Fig. 14 is a sectional view of the display device in the overcurrent passage display state, Fig. 15 is a sectional view of the display device in the lowered state, and Fig. 16 is a sectional view of the display device in the state where the indicator valve is tilted and lowered by its own weight. , FIG. 17 is a cross-sectional view of the display device in an enlarged state of FIG. 16, FIG. 18 is a cross-sectional view of a display tube showing a conventional example, FIG. 19 is a perspective view of a display valve of the conventional example, and FIG. The figure is a cross-sectional view of the display tube with the display valve tilted, FIG. 21 is a cross-sectional view of the display tube with the display valve enlarged from FIG. 20, and FIG.
FIG. 23 is a perspective view showing the second and third embodiments, respectively. Display cylinder...30, fluid...40, 41, valve body (display valve)...43, fan-shaped valve piece...46, connection member...47.

Claims (1)

[Scope of Claims] 1. Fluid is stored in a display cylinder, and a circular display valve disposed within the fluid so as to have a certain gap with the inner periphery of the display cylinder is connected to an actuating member. In the overcurrent passage display device, when an overcurrent occurs, the indication valve is pulled up through the actuating member to indicate the passage of the overcurrent, and after the overcurrent is resolved, the indication valve is lowered with a delay due to its own weight to perform the display operation for a certain period of time. , the indicator valve is characterized in that an odd number of equally divided fan-shaped valve pieces are connected by a flexible connecting member, and the indicator valve can be rotated slightly by the connecting member when the indicator valve is raised. Indication valve of overcurrent passing indicator device. 2. The indicator valve of the overcurrent passage indicator according to claim 1, wherein the indicator valve is composed of three fan-shaped valve pieces. 3. The display valve is characterized in that the fan-shaped valve pieces are connected to each other by pasting a connecting member between the upper surfaces of the circumferential edges of the corresponding fan-shaped valve pieces. Indication valve of overcurrent passing indicator device. 4. An indicator valve for an overcurrent passage indicator according to claim 2, wherein the indicator valve has sector-shaped valve pieces connected by a Y-shaped connecting member.