JPH10148564A - Float-type level gage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float-type level gage, in which a signal wire can be wired and taken out easily by providing the outer wall of a guide lever with a wiring groove having an entrance part whose diameter is wider than the wire diameter of the signal wire, an intermediate part which is narrower than the wire diameter, and an arrangement part, which is identical to the wire diameter. SOLUTION: When water is stored in an oil storage tank 2, a water-level detecting float 23 surfaces, a reed switch 21 is closed by a magnet 22 which is installed at the water-level detecting float 23, its detection signal is transmitted to a control circuit via a signal wire 13, an operating signal is output to an alarm from the control circuit, and it is detected that the water is stored inside the oil storage tank 2. A wiring groove 14 in which the signal wire 13 from a water detector 20 is arranged and installed is formed on the outer wall of a guide lever 10, the entrance of the wiring groove 14 is made wider than the wire diameter of the signal wire 13, its intermediate part is made narrower than the wire diameter, and its inner part is made to be identical to the wire diameter. When it is required to replace the signal wire 13 after an inspection, the signal wire 13 is pulled, it can be removed easily from the wiring groove 14, and a new signal wire 13 can be arranged and installed only by pushing the signal wire 13 into the wiring groove 14.

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 a liquid level in an oil storage tank buried under a gas station, particularly having a guide rod for guiding the rise and fall of the float,
The present invention relates to an improvement of a float type liquid level meter provided with a water detector at a lower end of a guide rod.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 7-63595 discloses a float type liquid level gauge having a guide rod provided with an oil level detection float and a water level detection float. The main body case of this float type liquid level gauge is attached to the upper end of the riser of an oil storage tank buried underground, and a guide rod extending into the oil storage tank is provided below the main body case. The first and second stoppers are provided at intervals below the guide rod, and the oil level detection float whose lowering is limited by the first stopper is fitted into the guide rod, A water surface detection float whose elevation is restricted by the stopper and the second stopper is fitted into the guide rod. And the magnet provided in each float is detected by a magnetostriction line, and an oil level and a water level are detected. As described above, since the magnetostrictive signal line is wired in the guide tube, there is no problem in wiring processing.

Japanese Utility Model Application Laid-Open No. 63-78219 discloses a float type liquid level gauge that mechanically indicates the elevation of an oil detection float via a wire. In this float type liquid level gauge, a guide rod extending into the oil storage tank is provided below the main body case, and the oil level detection float is engaged with the guide rod so as to be able to move up and down, and a reel provided in the main body case is provided. The wound wire is arranged along the outside of the guide rod and connected to the oil level detection float. The oil level detection float rises and falls by being guided by the guide rod, and a change in the oil level is transmitted to the reel via a wire, and the oil level is displayed. Since the oil level detection float and the reel are thus connected by a thin wire, there is no problem in the shape of the wire and the guide rod.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a guide rod having a shape capable of facilitating wiring of a signal line for transmitting the position of a water level detection float to a control circuit, and a scale for indicating the position of the oil level detection float. An object of the present invention is to provide a float-type liquid level gauge having a guide rod shaped so as not to damage the tape.

[0005]

According to the present invention, a reel and a control circuit are provided in a main body case installed above an oil storage tank, and the reel and the control circuit are inserted into the oil storage tank below the main body case. The guide rod is attached, and the first and second stoppers are provided at intervals below the guide rod, and the oil level detection float whose lowering is limited by the first stopper is fitted into the guide rod, and the The drawn scale tape is connected to the oil level detection float, the water level detection float whose elevation is restricted by the first stopper and the second stopper is fitted into the guide rod, and is opened and closed by the magnet provided on the water level detection float. A reed switch is provided in the vicinity of the first stopper, and a signal line connected to the reed switch is disposed in a wiring groove formed on an outer wall of the guide rod to control the inside of the case. It is connected to the road.

The wiring groove formed in the outer wall of the guide rod is formed by an entrance part wider than the diameter of the signal line, an intermediate part narrower than the diameter of the signal line, and an arrangement part having the same diameter as the guide rod. Are formed one by one on the opposing outer walls, wiring and extraction of the signal lines are easy, and the signal lines located in the arrangement portion do not come off naturally.

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

Further, a roller for guiding the scale tape is provided above the guide rod, and the scale tape is separated from the guide rod by this roller. The tape does not hurt.

A lock pin is attached to the lower end of the wire connected to the scale tape. The lock pin is detachably connected to a pin implanted in the oil level detection float, and the lock pin and the oil Since it is connected by a separate wire from the tip of the surface detection float, it is easy to pull out the oil level detection float from the oil storage tank.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a main body case 1 of a float type liquid level gauge is attached to an upper end of a rising pipe 3 of an oil storage tank 2 buried underground. A reel 5 around which the scale tape 4 is wound is provided in the main body case 1, and a fixed torque spring 6 for winding up and urging the scale tape 4 is attached to the reel 5. 7 is visible.

A support rod 8 provided below the main body case 1
A guide roller 9 is attached to a lower end of the support rod 8, and a guide rod 10 is fixed to the support rod 8. 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 the bottom of the oil storage tank 2 does not come into contact with the bottom of the oil storage tank 2 even if the temperature increases.

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 the guide rod 10 from coming into 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
, The middle portion is narrower than the wire diameter, and the inner portion is formed to be the same as the wire diameter.

The oil level detection float 15 has a guide hole 15a.
Is formed, and a pin 15b is implanted 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, and 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 15 c of the oil level detection float 15, and the lowering of the oil level detection float 15 is restricted by the first stopper 19.

As shown in FIG. 4, a 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 a. Reed switch 2
1 is mounted near the first stopper 19, and the reed switch 21 and the control circuit 12 in the main body case 1
The guide rod 10 is connected via a signal line 13 provided in a wiring groove 14. The water surface detection float 23 has a specific gravity of about 0.9 so that it sinks with oil and floats with water, and the vertical movement of the float 23 is restricted by the first stopper 19 and the second stopper 24.

Next, the operation will be described. The oil level detection float 15 moves up and down following the change of the oil level in the oil storage tank 1, and this elevation is transmitted to the scale tape 4 via the wire 16,
The liquid level mark written on the scale tape 4 is viewed from the window 7. At this time, since the reel 5 is urged to be wound up by the constant torque spring 6, the scale tape 4 does not become loose. The scale tape 4 is a guide roller 9
As a result, the scale tape 4 does not contact the guide rod 10 and the scale tape 4 is not damaged.

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

In order to remove the float type liquid 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 riser pipe 3 of the oil storage tank 2. Hit the part
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 lifting force of the wire 16 is applied to the distal end 15 c of the oil level detection float 15, and the oil level detection 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, the signal line 13 can be easily removed from the wiring groove 14 by drawing the signal line 13. Then, the signal lines can be arranged simply by pushing new signal lines into the wiring grooves 14.

[0020]

As described above, according to the present invention, a reel and a control circuit are provided in a main body case installed above an oil storage tank, and a guide rod to be inserted into the oil storage tank is attached below the main body case to guide the guide. First and second stoppers are provided at intervals below the rod, the oil level detection float whose lowering is restricted by the first stopper is fitted into the guide rod, and the scale tape pulled out from the reel is placed on the oil level. A reed switch, which is connected to the detection float, is fitted with a guide rod with a water surface detection float whose elevation is restricted by the first stopper and the second stopper, and is opened and closed by a magnet provided on the water surface detection float, is a first stopper. The signal line connected to the reed switch was placed 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 the drawings]

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

FIG. 2 is a cross-sectional view showing the same from the side.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Oil storage tank 3 Rise pipe 4 Scale tape 5 Reel 6 Constant torque spring 7 Window 8 Support rod 9 Guide roller 10 Guide rod 11 Channel 12 Control circuit 13 Signal line 14 Wiring groove 15 Oil level detection float 16, 18 Wire 17 Locking pin 19 First stopper 20 Water detector 21 Reed switch 22 Magnet 23 Water level detection float 24 Second stopper

Claims (5)

[Claims] 1. A reel and a control circuit are provided in a main body case installed on an upper part of an oil storage tank, and a guide rod inserted into the oil storage tank is mounted on a lower side of the main body case. The first and second stoppers are provided, the oil level detection float whose lowering is restricted 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. A water surface detection float whose elevation is restricted by the stopper and the second stopper is fitted into the guide rod, and a reed switch opened and closed by a magnet provided on the water surface detection float is provided near the first stopper, and the reed switch is A float type liquid level meter, wherein the connected signal line is disposed in a wiring groove formed on an outer wall of a guide rod and connected to a control circuit in a case. 2. A wiring groove formed on an outer wall of the guide rod, the entrance groove having a diameter larger than the diameter of the signal line, an intermediate portion having a diameter smaller than the diameter of the signal line, and an arrangement portion having the same diameter as the diameter of the guide rod. The float type liquid level gauge according to claim 1, wherein one is formed on each of the outer walls facing each other. 3. A U-shaped channel wider than the scale tape is formed on the guide rod, and a pin extending into the channel is implanted inside the guide rod of the oil level detection float. The float type liquid level meter according to claim 1, wherein the pin and a lower end of the scale tape are connected by a wire. 4. The float type liquid level meter according to claim 3, wherein a roller for guiding the scale tape is provided above 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 an oil level detection float, and the lock pin and the oil The float type liquid level meter according to claim 3, wherein the float type liquid level meter is connected to a tip end of the surface detection float by a separate wire.