JPH0832539B2 - Refueling device for oil storage tank - Google Patents

Description

TECHNICAL FIELD The present invention relates to a refueling device for an oil storage tank installed underground in a gas station such as a gas station.

[Prior Art] In a replenishment device in which an inflow pipe fixed to an oil storage tank and an oil supply pipe are connected via a control valve with a liquid level sensor, an oil supply hose of a tank truck is connected to the oil supply pipe to perform oil supply,
When the oil storage tank is accidentally full, the liquid level sensor detects the full liquid level and closes the main valve.

Even if the main valve of the tank truck is closed and the main valve is opened after the main valve is closed in the above replenishing device, the oil remaining in the oil supply pipe and oil hose does not enter air from the outside, so it flows down to the tank. do not do. If you remove the hose in this state, there is a problem that the oil remaining in the hose will be scattered.

Further, Japanese Laid-Open Patent Publication No. 56-4598 discloses a liquid supply stopping device, which automatically drives an on-off valve in a liquid supply pipe to close by utilizing the liquid pressure of the liquid to be supplied. However, it does not solve the above problems.

[Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide a replenishing device for an oil storage tank in which oil is not dissipated when the oil supply hose is removed after the end of oil supply.

[Means for Solving the Problems] According to the present invention, the inflow pipe fixed to the oil storage tank and the oil injection pipe are connected via a control valve with a liquid level sensor, and the control valve is a valve when opened. It has a diaphragm chamber equipped with a diaphragm that can move the locking pin that locks the shaft in the releasing direction, and a sensor tube that communicates with the diaphragm chamber and is hung from an air vent to detect the full tank liquid level. And an outlet of the control valve are connected by a communication pipe, and the communication pipe is provided with an atmosphere release valve, and a pressure relief valve is provided in the diaphragm chamber.

[Operation] In the refueling device for the oil storage tank configured as described above, the oil in the sensor tube is added when the oil tank is filled up by mistake by connecting the oil supply hose of the tank truck to the oil supply tube. When pressed, it acts on the diaphragm chamber to move the diaphragm to release the locking of the valve shaft by the locking pin and close the main valve that was opened in advance.

After the end of lubrication, the main valve of the tank truck is closed, the main valve is opened, the pressure relief valve of the diaphragm chamber is opened, and the atmosphere opening valve is opened, so that the flow passage is connected to the atmosphere through the communication pipe. Therefore, the oil remaining in the oil supply pipe and the oil supply hose flows down into the tank by the action of the air entering from the communication pipe.
Therefore, remove the oil supply hose from the tank truck and then remove it from the oil supply pipe.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, for example, an inflow pipe 2 is attached to the underground tank 1, and the inflow pipe 2 is entirely denoted by reference numeral 10.
The lubrication pipe 3 is connected via a control valve indicated by. An oil supply hose 7 connected to the coupling 6a of the main valve 6 of the tank truck R is connected to the coupling 3a of the oil supply pipe 3. An air vent 4 is connected to the underground tank 1, a control valve 10 is housed in a manhole cylinder 5, and a lid 5a is provided at the opening of the manhole cylinder 5.

The housing 11 of the control valve 10 has an inlet 12, an outlet.
13 are formed. The outflow port 13 is connected to the inflow pipe 2, the inflow port 12 is connected to the oil supply pipe 3, and the housing 19 is provided in the upper portion. A valve seat 14 is formed on the edge of the outlet 13.

A main valve 17 opposed to the valve seat 14 and biased in a valve closing direction by a spring 16 is housed. The valve shaft 18 of the main valve 17 is
It is locked in the rotational direction by a groove 19a formed in the housing 19 and extends upward, penetrates the housing 19, and projects into a knob 20 attached to the upper portion of the housing 19. A sleeve fixed to this knob 20 and housing 19.
A spring 40 for urging the knob 20 downward is interposed between the spring 20 and the valve 21, and the knob 20 is engaged with a flange portion 18a at the upper end of the valve shaft 18 to move the valve shaft 18 to the spring 16. A flange portion 20a is formed which is pulled up against.

On the other hand, a chamber 22 is formed in the housing 19, and the chamber 22 is defined by a diaphragm 23 into two left and right chambers 22a and 22b. On the right ventricle 22b side of this diaphragm 23, the piece 24
A lock pin 25 is provided through the lock shaft 18 and a lock groove 18b that is locked by the lock pin 25 when the main valve 17 is in the open position is formed in the valve shaft 18. Further, the right chamber 22b is provided with a manual pressure relief valve 42 biased by a spring 41 in the closing direction.

Further, the left chamber 22a has a spring 2 that biases the locking pin 25 toward the locking side.
6, the pressure equalizing pipe 27 from the left ventricle 22a is connected to the air vent 4
As shown in FIG. 3, the air vent 4 is opened by a communication pipe 28 at a communication part near the lower part of the valve seat 14 via the atmosphere opening valve 15. Further, a sensor pipe 29 that opens into the underground tank via the air vent 4 is provided, and the upper end of the sensor pipe 29 is opened 29a in the right chamber 22b.
The lower sensor tube 30 has an opening 30a slightly below the full tank position. The pressure equalizing pipe 27, the communication pipe 28, and the sensor pipe 29 are each made of a flexible pipe, and are easily attached. In addition, the lower sensor tube 30 is a lid for the air vent 4.
A nut 4c is fixed to the boss of 4a via a packing 4b so that the position of the opening 30a can be adjusted up and down. Further, the atmosphere release valve 15 is configured such that the knob 15a is rotated to selectively communicate the communication pipe 28 with the atmosphere via the air vent 4.

In this control valve 10, the knob 20 is normally pulled up to engage the engagement groove 18b of the valve shaft 18 with the engagement pin 25 of the diaphragm 23 and keep the main valve 17 open.

At the time of lubrication, the lubrication hose 7 of Lori R is connected to the lubrication pipe 3, the main valve 6 of the Lori is opened, and the oil is lubricated. Flow into. When the oil is filled with oil by mistake, the opening 30a of the sensor tube 30 is closed with liquid as shown in FIG. 4, the air in the sensor tubes 30 and 29 is pressurized, and the right chamber 22b is pressurized.
The diaphragm 23 to the left and the locking pin
25 is moved to the left to unlock the locking groove 18b. Therefore, the main valve 17 is urged by the spring 16 to be seated on the valve seat 14 to stop the lubrication.

When the main valve 17 is closed in this way, the main valve 6 of the Lori R is closed, the button 42a of the pressure relief valve 42 is pushed against the spring 41 to open the valve, and the pressure in the right chamber 22b is released. Later, knob 2
When 0 is pulled up against the spring 40, the valve shaft 18 is pulled up against the spring 16 via the flanges 20a and 18a, and the locking groove 18
The locking pin 25 is engaged with b and the main valve 17 is opened.

In this state, oil remains in the oil supply pipe 3 and the oil supply hose 7. Therefore, when the atmosphere release valve 15 is opened, the outlet 13
The side is opened to the atmosphere through the communication pipe 28 and the air vent 4. Therefore, the remaining oil flows down into the tank 1 from the inflow port 13 and the inflow pipe 2 by the action of the air entering from the communication pipe 28. Therefore, connect the hose 7 to the coupling 6a of the Lori R.
Even if the oil is removed from the coupling 3a of the oil supply pipe 3 and then removed from the coupling 3a of the oil supply pipe 3, the remaining oil is not scattered as in the conventional case. Then, the atmosphere release valve 15 is closed to prepare for the next lubrication.

[Effects of the Invention] Since the present invention is configured as described above, the following excellent effects can be achieved.

(I) After refueling, open the atmosphere release valve to connect the inflow pipe side to the atmosphere, and allow the oil remaining in the lubrication pipe and lubrication hose to flow down to the tank.

(Ii) The pressure relief valve in the diaphragm chamber can release the pressure in the diaphragm chamber to keep the main valve open.

(Iii) Therefore, it is possible to prevent oil from scattering when the supply hose is removed.

[Brief description of drawings]

FIG. 1 is a side view showing a filling station which is filling a storage tank with oil from a tank truck by a replenishing device embodying the present invention, and FIG. 2 is a side sectional view showing an essential part of an embodiment of the present invention when a valve is opened. 3 is a side sectional view around the atmosphere opening valve, and FIG. 4 is a drawing corresponding to FIG. 2 when the valve is closed. 1 ... Oil storage tank, 2 ... Inflow pipe, 3 ... Lubrication pipe, 4 ...
… Air vent, 7… Lubrication hose, 10… Control valve, 15…
… Atmosphere release valve, 23 …… Diaphragm, 27 …… Pressure equalizing pipe, 28
...... Communication pipe, 28a …… Opening, 29 …… Sensor pipe, 30 …… Lower sensor pipe, 30a …… Opening

Claims (1)

[Claims] 1. An inflow pipe (2) fixed to an oil storage tank (1) and an oil injection pipe (3) are connected via a control valve (10) with a liquid level sensor, and the control valve (10) is Valve shaft when opened (18)
A diaphragm chamber (22) provided with a diaphragm (23) capable of moving a locking pin (25) that locks the valve in the releasing direction, and a diaphragm tank (22) that communicates with the diaphragm chamber (22) and is suspended from an air vent (4) to fill a full tank liquid. And a sensor pipe (29) for detecting the position, the air vent (4) and the outlet (1) of the control valve (10).
3) is connected to a communication pipe (28), the communication pipe (28) is provided with an atmosphere release valve (15), and the diaphragm chamber (22) is provided with a pressure relief valve (42). Replenishing device for the oil storage tank.