JPS6326781Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention stores liquid in an indicator tube, pulls up an indicator valve placed in the liquid when an overcurrent passes through it, and then lifts up the indicator valve after the overcurrent passes through the display cylinder to determine the viscosity of the liquid. The present invention relates to a structure for preventing leakage of liquid stored in a display cylinder in an overcurrent passage display device that indicates the passage of an overcurrent for a certain period of time by causing a delayed weight drop using resistance.

Prior Art In the display section of an overcurrent passage display device, a colored fluid with high viscosity and low specific gravity, such as oil, and a transparent fluid with low viscosity and high specific gravity are stored in upper and lower layers in the display tube. It has been proposed that a lifting member that is vertically movably inserted through an insertion hole provided through a partition wall is connected to an indicator valve disposed within the fluid. Normally, the display valve was immersed in a transparent fluid so that it could be clearly seen through a display window provided at the bottom of the display tube. Also, when an overcurrent flows, the current detector detects the flow, and the indicator valve is pulled up into the colored fluid via a lifting member driven by the drive unit, making the colored fluid visible through the display window and preventing the overcurrent from passing. After displaying the message, it was brought back down by its own weight while resisting the resistance of the fluid.

Purpose The purpose of this invention is to prevent liquid leakage of the fluid stored in the display cylinder as described above to the outside of the display cylinder, and to prevent negative effects on other mechanisms. Our goal is to provide the following.

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 1 to 7.

This overcurrent passage display device can be roughly divided into a current detection section A that detects overcurrent, a rotary solenoid RS that is driven by the detection section A, a lifting mechanism H that performs a lifting operation by driving the rotary solenoid RS, and a The display device I is configured by a display device I that is operated by a lifting mechanism H.

First, we will explain the current detection section A. This detection section controls the detection current transformer CT attached to the electric wire L and the transform current generated in the transformer CT when an overcurrent flows through the electric wire L. , and a control circuit C that drives the rotary solenoid RS.

When the rotary solenoid RS is energized, the output shaft is driven while accumulating the return spring S, which is a built-in energy storage member, and when the excitation is released, the output shaft is rotated back to its original position by the return spring S. ing.

Next, the lifting mechanism H will be explained.

This lifting mechanism H operates after the output shaft of the rotary solenoid RS rotates once when an overcurrent passes.
When it is rotated back to its original position by the return spring S, the string-like member 1 serving as a pulling member whose base end is engaged with the lifting mechanism H for the first time is pulled up to a predetermined position, and after being pulled up, it is made to freely fall to the original position. There is.

The rotary solenoid RS and the lifting mechanism H are attached to a frame 50, and the frame 50 is suspended from a wire clamping part (not shown) that houses the current detection part A.

Next, the display device will be explained.

Reference numeral 2 denotes a bottomed cylindrical display tube made of colorless and transparent synthetic resin or glass, which is provided below the rotary solenoid RS and the lifting mechanism H, and is screwed onto the upper end opening in a watertight manner. It is fixed to a frame body 50 to which a lifting mechanism H and a rotary solenoid RS are attached via a lid 3 as a transparent upper partition made of resin.

A funnel-shaped guide surface 4 is recessed in the upper central surface of the lid 3, and a protrusion 5 that protrudes downward by h is formed in the lower central surface, and a thin insertion hole 6 is formed in the vertical direction thereof. It is set up. Note that the upper and lower ends of the insertion hole 6 are each opened outward in a flared shape, and the amount of expansion due to thermal expansion of fluids 21 and 22, which will be described later, stored in the display tube 2 up to a predetermined temperature is controlled. The length of the insertion hole 6 is set so that the material can be absorbed within the insertion hole 6. and,
The insertion hole 6 is formed to be narrow enough to prevent liquid leakage even if the display device oscillates or falls over when the liquid level of the colored fluid 21 (described later) is within the insertion hole 6.

Reference numeral 7 denotes a ring-shaped protrusion extending from the top of the lid 3 so as to surround the guide surface 4, and together with the guide surface 4 constitutes an inflation liquid storage section 8. The expansion liquid storage section 8 is configured to store a fluid 21 that expands from the insertion hole 6 due to thermal expansion of liquids 21 and 22, which will be described later, when the external environment reaches a predetermined temperature or higher.

Reference numeral 9 denotes an injection hole which penetrates the inside and outside of the lid 3 on the outside of the protrusion 7, and has a female thread engraved on the inner periphery, and a screw 10 can be screwed into the hole in a watertight manner during use.

In addition, 11 is a mounting protrusion provided with a female threaded part for attaching the frame 50, and 12 is a support protrusion that also comes into contact with the lower surface of the frame 50.

13 is concentric with the inner bottom surface of the display tube 2 and has a cross section V
A plurality of oil adhesion prevention parts 14 are carved in a letter shape from the outer periphery of the lower part of the display tube 2 (four in this example).
These are legs that protrude downward.

Reference numeral 15 is a black hook member screwed onto the outer periphery of the lower end of the display tube 2, and a fitting groove 16 that goes around is recessed in the upper end of the hook member. The lower end of a cylindrical main body case 17 whose upper end is fitted into the lower surface of a wire clamping part (not shown) is fitted into the fitting groove 16.

Reference numeral 18 denotes a locking protrusion protruding from the outer periphery of the display tube 2 so as to be located above the hook member 15. Between the locking protrusion 18 and the upper surface of the hook member 15, there is a locking protrusion 18 located on the inner circumference of the main body case 17. O-ring 19 that contacts watertightly
has been established.

Reference numeral 20 denotes a cylindrical reflective member made of aluminum or the like and made of silvery white and fitted onto the inner periphery of the display tube 2 . 2
Reference numerals 1 and 22 denote a colored fluid (red in this example) with low specific gravity and high viscosity and a transparent fluid (colorless in this example) with high specific gravity and low viscosity stored in upper and lower layers in the display tube 2, respectively. . In addition,
It is desirable that the ratio of the specific gravity of the two be set to 2.0 or more, as this will stabilize the two-layer separation. The transparent fluid 22 is stored in such a way that when the overcurrent passage display device is turned upside down as shown in FIG. There is. Further, the colored fluid 21 is filled so as to occupy the remaining volume of the display cylinder 2.

Further, both fluids 21 and 22 are liquids whose viscosity changes little due to changes in external environmental conditions, such as colored fluid 2.
Silicone oil is used as 1, and Fluorinert (Minnesota Mining & MFG) is used as transparent fluid 22.
Company's proprietary trademark), uses fluorinated inert liquids such as fluorocarbon oils.

Reference numeral 23 denotes a valve body as an indicator valve that is always located in the fluids 21 and 22, and a stop member in which the tip of the string-like member 1 inserted into the insertion hole 6 of the lid 3 comes into contact with the lower surface of the valve body 23. It is attached to 24.

As shown in FIG. 5, this valve body 23 is made of discs made of a silver-white light metal such as aluminum, which are equally divided into an odd number (three in this embodiment) and arranged at a predetermined distance Q from each other. A thin circular connecting member made of a closed foam elastic body made of polyethylene or the like is attached to the upper surface of each fan-shaped valve piece 25 with a diameter slightly reduced from the circumferential surface of the fan-shaped valve piece 25. It is formed from.

The valve body 23 is installed inside the reflecting member 20 so as to be movable up and down with a small gap, and
By bending downward at the bending portion 26a (see FIG. 6) provided between each of the sector-shaped valve pieces 25 in the connecting member 26, each sector-shaped valve piece 25 is attached to the valve body 2.
It allows for slight downward tilting around the center of 3.

The apparent specific gravity of this valve body 23 is greater than that of the colored fluid 21 and less than that of the transparent fluid 22, and under normal conditions the entire lower surface of the sectorial valve piece 25 is submerged in the transparent fluid 22 and is positioned so as to leave a gap between it and the bottom 2a of the display tube 2 which also serves as a display window.

In this embodiment, the magnitude relationships among the specific gravity of the fan-shaped valve piece 25, the connecting member 26, the colored fluid 21, and the transparent fluid 22, and the apparent specific gravity of the valve body 23 are as follows.

Fan-shaped valve piece 25>Transparent fluid 22>Entire valve body 23>
Colored fluid 21>Connection member 26 To explain the operation of the overcurrent passage display device configured as above, when an overcurrent of more than a set value passes through the electric wire L, a transformed current is generated by the transformer CT, Rotary solenoid by control circuit C
RS rotates its output shaft in the driving direction against the elastic force of the return spring S installed therein.

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 valve body 23 of the display device is moved by gravity and the fluid 2 through the string member 1 of the lifting mechanism H.
It is pulled upward while resisting the viscous resistance of 1 and 22.

At this time, the valve body 23 is connected to the fan-shaped valve piece 2 as shown in FIG.
5 is a bending portion 26a against the elastic force of the connecting member 26.
It is tilted by a certain amount while being bent downward at , and the entire body is pulled up into the colored fluid 21 . The valve body 23 of the display device is positioned above the colored fluid 21 as shown in FIG. 3, so that the color of the colored fluid 21 can be visually recognized through the bottom 2a of the display tube 2. In this way, the overcurrent passage display is performed.

After the valve body 23 is raised to a predetermined position by the string-like member 1, the valve body 23 starts to descend due to its own weight, and each sector-shaped valve piece 25 becomes horizontal due to the viscous resistance of the colored fluid 21 and the elastic force of the connecting member 26. Tilt returns.

Thereafter, the valve body 23 is delayed and lowered due to the viscous resistance of the colored fluid 21, and after a predetermined time, the fan-shaped valve piece 23 is lowered.
5 until the entire lower surface is immersed in the transparent fluid 22, the display returns to the normal state.

A string-like member 1 transparently installed in the lid 3 of this display tube 2
The colored fluid 22 stored in the display tube 2 enters the insertion hole 6, but the insertion hole 6 is formed thin and the surface tension and viscosity of the colored fluid 22 prevents the display device from shaking laterally. It will not leak out from the display tube 2 even if it is.

Further, if the temperature of the external environment rises within a predetermined temperature range, when the fluids 21 and 22 thermally expand, the swollen colored fluid 21 is absorbed into the insertion hole 6. Further, when the temperature rises above a predetermined temperature, the expansion liquid flows out through the insertion hole 6 into the expansion liquid storage section 8, but the protrusion 7
This prevents the colored fluid 22 from flowing out from the inflation fluid storage section 8. Further, when the thermally expanded colored fluid 21 cools down, the colored fluid 21 bulged into the expansion liquid storage section 8 flows into the display cylinder 2 through the insertion hole 6 by the funnel-shaped guide surface 4, and thus expands. It does not remain in the liquid storage section 8.

When the overcurrent passage display device is overturned due to wind pressure or the like as shown in FIG. 7, the transparent fluid 22, which has a higher specific gravity than the colored fluid 21, flows from around the valve body 23 toward the lid 3, and is separated from the colored fluid 21 by the upper and lower sides. become layers. However, since the insertion hole 6 is formed in the protrusion 5 that protrudes into the display cylinder 2 and the protrusion 5 protrudes beyond the liquid level of the transparent fluid 22 layer, the transparent fluid 22 flows out from the insertion hole 6. Never. On the other hand, since the through hole 6 is thin, the colored fluid 21 does not flow out from the through hole 6 due to its viscosity and surface tension.

In addition, when the transparent fluid 22 and the colored fluid 21 are to be fully stored in the display cylinder 2, both fluids 21 and 22 are poured until the display cylinder 2 is almost full, and then the lid 3 is screwed onto the display cylinder 2. At this time, some air remaining in the display tube 2 is exhausted from the injection hole 9,
Subsequently, the fluid 21 is injected through the injection hole 9 using a syringe or the like to completely exhaust the air inside the display cylinder 2. Thereafter, by screwing the screw 10 into the injection hole 9, the inside of the display cylinder 2 can be filled.
As described above, in this embodiment, since the injection hole 9 is provided in the lid 3, the display cylinder 2 can be easily filled to the full without discharging the air.

Effects As detailed above, this device stores a transparent fluid with high specific gravity and low viscosity and a colored fluid with low specific gravity and high viscosity in two layers, upper and lower, in the display tube provided with the upper partition wall. An indicator valve disposed within the liquid is connected to the tip of a lifting member that is vertically movably inserted through an insertion hole provided in a partition wall;
When an overcurrent occurs, the indicator valve is pulled up into the colored fluid via the pulling member to display an overcurrent passage indication, and after the overcurrent is resolved, the indicator valve is lowered with a delay due to its own weight to display the overcurrent passage for a certain period of time. In the display device, a protrusion that protrudes from the liquid level of the transparent fluid layer formed when the display device is turned upside down is provided on the upper partition wall, and the insertion hole is made narrower in the vertical direction relative to the protrusion. By forming
Since the fluid inside the display tube does not leak even when it oscillates due to wind pressure or falls over, it does not adversely affect other mechanical parts and is an excellent invention for industrial use as an overcurrent passage display device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a sectional view of the display device with the indicator valve in the raised state, and FIG. 3 is a sectional view of the display device in the overcurrent passage display state.
Fig. 4 is a cross-sectional view of the display valve in its lowered state, Fig. 5 is an enlarged exploded perspective view of the display piece, Fig. 6 is a plan view of the display valve, and Fig. 7 is a cross-sectional view of the display device when it falls over. . Display tube 2, upper partition wall (lid) 3, protrusion 5, insertion hole 6, colored fluid 21, transparent fluid 22.

Claims (1)

[Claims for Utility Model Registration] 1. A transparent fluid with high specific gravity and low viscosity and a colored fluid with low specific gravity and high viscosity are stored in upper and lower layers in a display cylinder provided with an upper partition wall, and a transparent fluid with high specific gravity and high viscosity is stored in an upper and lower layer. An indicator valve disposed in the liquid is connected to the tip of a pulling member which is vertically movably inserted through the provided insertion hole, and when an overcurrent occurs, the indicator valve is pulled up into the colored fluid via the pulling member. In an overcurrent passage display device that does not display an overcurrent passage indication when the overcurrent is cleared, but displays the indication for a certain period of time by delaying the display valve down by its own weight after the overcurrent is resolved, the A liquid leakage prevention structure for an overcurrent passage display device, characterized in that a protruding part that protrudes from the liquid level of a transparent fluid layer is provided on the upper partition wall, and the insertion hole is formed narrowly in the vertical direction relative to the protruding part. 2. The overcurrent according to claim 1 of the utility model registration, characterized in that the length of the insertion hole is set to a length that absorbs the amount of expansion due to thermal expansion of the fluid stored in the display cylinder. Liquid leakage prevention structure for passage display device. 3. The overcurrent passage display device according to claim 1 or 2 of the utility model registration claim, characterized in that the upper surface of the upper partition wall is provided with an expansion liquid storage section by protruding a protrusion surrounding the insertion hole. Leak-proof structure. 4 Utility model registration claim 3, characterized in that the upper surface of the upper partition wall surrounded by the protrusions is formed into an oblique guide surface that guides the inflation liquid to the insertion hole.
Liquid leakage prevention structure of the overcurrent passage display device described in . 5 Claims 1 to 4 of the utility model registration claim characterized in that the upper partition wall is provided with an injection hole.
Liquid leakage prevention structure of the overcurrent passage display device according to any one of the items.