JP3424469B2 - Float type liquid level gauge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float type liquid level gauge for measuring the liquid level in an oil storage tank buried underground in a gas filling station, and in particular, having a guide rod for guiding up and down of the float,
The present invention relates to an improvement of a float type liquid level gauge in which a water detector is provided at the lower end of a guide rod.

[0002]

2. Description of the Related Art Japanese Laid-Open Patent Publication No. 7-63595 discloses a float type liquid level gauge in which a guide rod is provided with an oil level detecting float and a water level detecting float. The main body case of this float type level gauge is attached to the upper end of the rising pipe of the oil storage tank buried underground, and a guide rod extending to the inside of the oil storage tank is provided under the main body case, and the magnetostriction is provided in this guide rod. Lines are provided, first and second stoppers are provided at a lower portion of the guide rod at intervals, and an oil level detection float whose descent is limited by the first stopper is fitted into the guide rod. A water surface detection float whose vertical movement is restricted by a stopper and a second stopper is fitted in the guide rod. Then, the magnet provided on each float is detected by a magnetostrictive wire to detect the oil level and the water level. As described above, since the magnetostrictive signal line is wired in the guide tube, there is no problem in wiring processing.

Further, as a float type liquid level gauge for mechanically indicating the elevation of an oil detection float via a wire, there is known a practical level gauge 63-78219. In this float type liquid level gauge, a guide rod that extends into the oil storage tank is provided on the lower side of the main body case, and an oil level detection float is engaged with this guide rod so that it can be moved up and down, and the reel provided in the main body case The wound wire is arranged along the outer side of the guide rod and is connected to the oil level detection float. Then, the oil level detection float is guided by the guide rod to move up and down, and the change in the oil level is transmitted to the reel via the wire so that the oil level is displayed. Since the oil level detection float and the reel are connected by a thin wire in this manner, the problem of the shape of the wire and the guide rod does not occur.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a guide rod having a shape that facilitates wiring of a signal line for transmitting the position of the water surface detection float to a control circuit, and a scale for displaying the position of the oil surface detection float. It is an object of the present invention to provide a float type liquid level gauge having a guide rod having a shape that prevents the tape from being damaged.

[0005]

In order to achieve the above object, the present invention provides a reel and a control circuit in a main body case installed above an oil storage tank and inserts the reel and the control circuit into the oil storage tank below the main body case. The guide rod is attached, the first and second stoppers are provided under the guide rod at intervals, and the oil level detection float whose descent is limited by the first stopper is fitted into the guide rod, Connect the drawn scale tape to the oil level detection float, insert the water level detection float whose rising and lowering is restricted by the first stopper and the second stopper into the guide rod, and open / close it with the magnet provided on the water level detection float. A reed switch is installed near the first stopper, and the signal line connected to the reed switch is installed in the wiring groove formed on the outer wall of the guide rod to control the inside of the case. It is connected to the road.

The wiring groove formed on the outer wall of the guide rod is formed by an inlet portion wider than the wire diameter of the signal wire, an intermediate portion narrower than the wire diameter, and an arrangement portion having the same diameter as the wire diameter. Since one is formed on each of the outer walls facing each other, it is easy to wire and take out the signal line, and the signal line located in the arrangement portion does not come off naturally.

Further, a U-shaped channel wider than the width of the scale tape is formed in the guide rod, and a pin extending into the channel is planted inside the guide rod of the oil level detecting float. Since the pin and the lower end of the scale tape are connected by a wire, contact between the scale tape and the guide rod is reduced and the scale tape is not damaged.

Further, a roller for guiding the graduation tape is provided on the upper part of the guide rod, and the graduation tape is separated from the guide rod by the roller, so that the graduation tape and the guide rod are not in contact with each other and the graduation is eliminated. The tape doesn't hurt.

A locking pin is attached to the lower end of the wire connected to the scale tape, and the locking pin is detachably connected to the pin implanted in the oil level detection float. Since the tip of the surface detection float is connected by a wire separate from the tip, the oil surface detection float can be easily pulled out from the oil storage tank.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a body case 1 of the float type liquid level gauge is attached to the upper end of a rising pipe 3 of an oil storage tank 2 buried underground. A reel 5 around which a scale tape 4 is wound is provided in the main body case 1, and a constant torque spring 6 that winds up and urges the scale tape 4 is attached to the reel 5. The scale tape 4 is a window of the main body case 1. It is visible from 7.

A support rod 8 provided on the lower side of the main body case 1.
A guide roller 9 is attached to the lower end of the guide rod 9, and a guide rod 10 is fixed to the support rod 8. In addition, the guide rod 10
The lower end of the guide rod 10 is separated from the bottom 2a of the oil storage tank by about 1 cm so that it does not come into contact with the bottom 2a of the oil storage tank 2 even if temperature rises.

As shown in FIG. 3, a U-shaped channel 11 wider than the scale tape 4 is formed on the guide rod 10 to prevent contact with the scale tape 4.

A wiring groove 14 for arranging a signal line 13 from a water detector 20, which will be described later, is formed on both outer walls of the guide rod 10. The entrance of the wiring groove 14 is the signal line 13
Is wider than the wire diameter, the middle part is narrower than the wire diameter, and the inner part is formed to have the same diameter as the wire diameter.

The oil level detecting float 15 has a guide hole 15a.
And a pin 15b is planted on the inner surface of the guide hole 15a. Then, the guide rod 10 is inserted into the guide hole 15a of the oil level detection float 15, the locking pin 17 is attached to the wire 16 connected to the lower end of the scale tape 4, and the locking pin 17 is detachable from the pin 15b. It is connected to the. The wire 18 extending from the locking pin 17 is connected to the tip 15c of the oil level detection float 15, and the oil level detection float 15 is restricted from descending by the first stopper 19.

As shown in FIG. 4, the water detector 20 provided at the lower end of the guide rod 10 includes a reed switch 21 mounted in the channel 11 of the guide rod 10 and a magnet 22 for opening and closing the reed switch 21. And a water surface detection float 23 provided with. Reed switch 2
1 is attached near the first stopper 19, and the reed switch 21 and the control circuit 12 in the main body case 1 are
It is connected via a signal line 13 arranged in a wiring groove 14 of the guide rod 10. The specific surface gravity of the water surface detection float 23 is about 0.9 so that the float sinks in oil and floats in water, and its up and down is restricted by the first stopper 19 and the second stopper 24.

Next, the operation will be described. Following the change in the oil level in the oil storage tank 1, the oil level detection float 15 moves up and down, and this up and down is transmitted to the scale tape 4 via the wire 16,
The liquid level scale marked on the scale tape 4 is visually observed through the window 7. At this time, the reel 5 is biased by being wound up by the constant torque spring 6, so that the scale tape 4 does not loosen. Further, the scale tape 4 is a guide roller 9
Since it is separated from the guide rod 10, the scale tape 4 does not contact the guide rod 10 and the scale tape 4 is not damaged.

When water is stored in the oil storage tank 2, the water surface detection float 23 floats up, and the magnet 22 provided on the water surface detection float 23 closes the reed switch 21. This detection signal is sent via the signal line 13 to the control circuit. To 12
An operation signal is output from the control circuit 12 to an alarm (not shown), and it can be known that water has accumulated in the oil storage tank 2.

To remove the float type level gauge from the oil storage tank 2 for maintenance and inspection, the scale tape 4 is pulled up by hand, and the oil level detection float 15 attaches the rising pipe 3 of the oil storage tank 2. Hit the
When the wire 16 is further pulled up, the stop pin 17 is disengaged from the pin 15b of the oil level detection float 15. Then, the pulling force of the wire 16 is applied to the tip portion 15c of the oil surface detecting float 15 so that the oil surface detecting float 15 becomes vertical and can be pulled out from the rising pipe 3 together with the guide rod 10.

If the signal line 13 needs to be replaced after inspection, it can be easily removed from the wiring groove 14 by pulling the signal line 13. The signal line can be arranged only by pushing a new signal line into the wiring groove 14.

[0020]

As described above, according to the present invention, the reel and the control circuit are provided in the main body case installed on the upper part of the oil storage tank, and the guide rod to be inserted into the oil storage tank is attached to the lower side of the main body case to guide the guide. First and second stoppers are provided at the lower part of the rod at intervals, and an oil level detection float whose descent is limited by the first stopper is fitted into the guide rod, and the scale tape pulled out from the reel is put on the oil level. Connected to the detection float, fit the water surface detection float whose rising and lowering is restricted by the first stopper and the second stopper into the guide rod, and the reed switch opened and closed by the magnet provided on the water surface detection float as the first stopper. The signal line connected to the reed switch was installed in the wiring groove formed on the outer wall of the guide rod and connected to the control circuit in the case. In which the can be easily wiring of the signal line for transmitting the position of the knowledge float control circuit.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a float type liquid level gauge of the present invention is attached to an oil storage tank.

FIG. 2 is a sectional view showing the same side view.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 body case 2 oil storage tank 3 rising tube 4 scale tape 5 reel 6 Constant torque spring 7 windows 8 Support rod 9 Guide roller 10 Guide rod 11 channels 12 Control circuit 13 signal lines 14 wiring groove 15 Oil level detection float 16, 18 wire 17 Locking pin 19 First stopper 20 water detector 21 Reed switch 22 magnets 23 Water surface detection float 24 Second stopper

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01F 23/56 G01F 23/62

Claims (5)

(57) [Claims] 1. A reel and a control circuit are provided in a main body case installed at an upper part of an oil storage tank, a guide rod to be inserted into the oil storage tank is attached to a lower side of the main body case, and a space is provided at a lower part of the guide rod. First and second stoppers are provided, the oil level detection float whose descent is limited by the first stopper is fitted into the guide rod, and the scale tape pulled out from the reel is connected to the oil level detection float. The water surface detection float whose vertical movement is restricted by the stopper and the second stopper is fitted into the guide rod, and the reed switch that is opened and closed by the magnet provided on the water surface detection float is provided near the first stopper. A float type liquid level gauge characterized in that the connected signal line is arranged in a wiring groove formed on the outer wall of the guide rod and connected to a control circuit in the case. 2. The wiring groove formed on the outer wall of the guide rod is formed by an inlet portion wider than the wire diameter of the signal line, an intermediate portion narrower than the wire diameter, and an arrangement portion the same as the wire diameter. The float type liquid level gauge according to claim 1, wherein one is formed on each of the opposing outer walls of the float type liquid level gauge. 3. A U-shaped channel wider than the width of the scale tape is formed on the guide rod, and a pin extending into the channel is planted inside the guide rod of the oil level detecting float. The float type level gauge according to claim 1, wherein the pin and the lower end of the scale tape are connected by a wire. 4. The float type liquid level gauge according to claim 3, wherein a roller for guiding the scale tape is provided on an upper portion of the guide rod, and the scale tape is separated from the guide rod by the roller. 5. A lock pin is attached to a lower end of the wire connected to the scale tape, and the lock pin is detachably connected to a pin implanted in the oil level detection float. 5. The float type liquid level gauge according to claim 3, wherein the float type liquid level gauge is connected to the tip of the surface detecting float by a wire separate from the tip.