JPS6031719B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid supply device such as a fuel supply device used at a gas station or the like.

In this type of liquid supply device, the tip of the liquid supply nozzle installed at the end of the hose is inserted into the mouth of the liquid tank to supply liquid, but when the tank is full (so-called full), the nozzle's built-in valve Liquid supply nozzle with automatic valve closing mechanism (
A so-called auto nozzle) is commonly used.

In the most common configuration of this automatic valve closing mechanism, negative pressure is generated in a chamber containing a diaphragm connected to the opening/closing lever of the valve with a built-in nozzle through an appropriate element, and the valve is operated by the displacement of the diaphragm. The fulcrum of the lever is moved to close the nozzle's built-in valve.

In the conventional configuration, the diaphragm chamber is connected to the narrowed part of the through flow path in the nozzle via a communication path, and this communication path is connected to a negative pressure compensating pipe that closes to the outside (atmosphere) at the tip of the nozzle. ing.

Therefore, when the liquid flows through the through-flow path in the nozzle due to liquid supply, the through-flow path with the narrowed part functions as a Venturi pipe, and negative pressure is generated in the diaphragm chamber via the communication path. The displacement of the diaphragm is compensated by the air sucked in from the negative pressure compensating pipe, and thus the closing of the valve built into the nozzle is prevented. As is well known, when the replenishment liquid tank is full and the rising liquid level closes the tip of the negative pressure compensating tube, the negative pressure in the diaphragm chamber is no longer compensated, and the diaphragm is displaced by this negative pressure, causing the valve to close. Closed.
By the way, the air sucked through the negative pressure compensating pipe is mixed into the liquid flowing through the nozzle through-flow path through the narrowed part, becomes bubbles, and flows into the supplied liquid tank together with the supplied liquid.

When these bubbles accumulate near the inlet of the tank and swell up, the bubbles block the opening (air intake port) of the negative pressure compensating tube at the tip of the nozzle and activate the automatic valve closing mechanism, even though the tank is not full. This causes the nozzle's built-in valve to close. This tendency is particularly noticeable when the liquid supplied is light oil. Recently, some cars have installed a wire mesh or the like inside the oil filler port to prevent the insertion of a pipe for oil extraction in order to prevent the oil from being stolen from the oil storage tank of the vehicle.

In this case, the above-mentioned air bubbles are blocked by the wire gauze and cannot pass through, so that the automatic valve closing mechanism operates even more quickly and becomes a serious hindrance to the refueling operation. Furthermore, in the conventional configuration, in the case of low-speed oil supply, the flow rate of oil in the nozzle passage is low and it is difficult to perform the function of the venturi pipe, so that the automatic valve closing mechanism may not operate reliably.

The present invention has been proposed in view of the above points, and includes a through flow path, a valve disposed in this flow path, a mechanism for manually opening and closing this valve, and an automatic mechanism for automatically closing the valve by the generation of negative pressure. A valve closing mechanism and a liquid supply nozzle equipped with a negative pressure compensation path that communicates the negative pressure generation chamber of the automatic valve closing mechanism to the atmosphere through an air suction port that closes outward at the tip of the pipe. In the liquid device, an air suction port opening/closing means is provided at the tip of the tube tip pipe to normally close the air suction port and to open the air suction port when the tip portion of the tube tip pipe is inserted into the liquid supply port. , when the negative pressure compensating path or the negative pressure generating chamber is connected to the negative pressure generating means provided separately in the nozzle via a continuous flow path, and the automatic valve closing mechanism operates and the valve is closed. and further includes a flow path switching means for cutting off communication between the negative pressure compensation path or the negative pressure generation chamber and the pressure generation means and opening the negative pressure compensation path or the negative pressure generation chamber to the atmosphere. Features.

The illustrated embodiment will be described in detail below. 1 is the main body of the nozzle,
2 is a flow path passing through this main body, 3 is a valve that opens and closes the flow path 2, and 4 is a valve opening/closing operation lever that holds the valve 3 in the open position (the chain line position in Figure 1) and the closed state. The permissible position (solid line position in FIG. 1) can be selectively determined.

5 is a diaphragm chamber, and the diaphragm 6 separates the upper first compartment (negative pressure generation chamber) 5A and the lower second compartment 5B.
It is fractionated into

7 is an automatic closing mechanism for valve 3, and on one side is a spindle 6'
is attached to the diaphragm, and on the other side, displacement punch 7' is attached to pin 8.
are respectively connected to the proximal ends of the levers 4.

The pin 8 forms the fulcrum of the ladder bar 4. 6″ is spindle 6′
This is a ball that connects the displacement village 7' and the displacement village 7'.

As is well known, when the diaphragm 6 is pulled upward from the position shown in FIG. 1, the spindle 6' is also displaced upward, and the connection with the displacement shaft 7' by the ball 6'' is severed.

The upward lifting of the diaphragm 6 is carried out by creating a negative pressure in the first compartment 5A of the diaphragm chamber.

For this purpose, the first compartment 5A is connected to the connecting path 9, the annular path 10, the connecting path 11, the three-way valve 12, the connecting path 11', the air hose 13
It is connected to the primary side of the exhaust pump 14 via. The turtle 5 is a negative pressure compensating path inserted into the nozzle tip pipe 1', and has an air suction port 15' at the tip that communicates with the outside (atmosphere) near the tip of the nozzle tip pipe 1'. The annular passage 10, and therefore the negative pressure generating chamber 5A, is conveyed therethrough. The air suction opening opening/closing ring is attached to the tip of the 16 tube tip pipe 1' in a manner that allows the air suction port to open and close, and is normally biased to a position where the suction port 16' is closed by a coil spring 17 attached to the tube tip pipe. .

18 is a member for preventing the opening and closing ring 16 from coming off.

Referring to Figure 3, 19 is a housing for a ground-mounted refueling system, and an underground oil storage tank (not shown) is an oil suction pipe.
The lotus is suitable.

21 is an oil pump, and 22 is a motor that drives the oil 21 and the above-mentioned exhaust pump 14.

23 is an oil feed pipe, 24 is a gas-liquid separator interposed in the oil feed pipe 23, 25 is a flow meter, 26 is a fuel hose that sends the oil measured by the flow meter to the through flow path 2 of the nozzle 1, and 27 is a flow rate Total 25
is a count indicator connected to the output of

2 8 is a nozzle case, and 2 9 is a nozzle switch. When the nozzle is removed from the nozzle case 28, a motor energizing signal is generated.

The air hose 13 and the oil vapor discharge pipe 31 from the nozzle case 28 are connected by a third gas-liquid separator.

32 is a return pipe for returning the oil separated in the gas-liquid separator 30 to the upper pipe 2, and 33 is a pressure switch connected to the air hose 13 and operated by a pressure change in the air hose 13.

In the above configuration, when the nozzle 1 is removed from the nozzle case 28, the nozzle switch 29 is closed, the motor 22 is energized, and the oil pump 21 and exhaust pump I4 are operated. 11' is passed through, and the closing/opening ring 16 is connected to the negative pressure compensating path 15 and the air suction port 15.
' is closed, pressure is generated in the negative pressure generating chamber 5A and the diaphragm 6 is pulled up, so the spindle 6' connected to the diaphragm 6 in the automatic closing mechanism 7
is also pulled up and the connection with the displacement village 7' by the ball 6'' is released.

Therefore, even if the lever 4 is squeezed in this state, the lever 4 will rotate counterclockwise using the supporting point P with the bento 3' as a fulcrum, the displacement punch 7' will descend, and the fulcrum (pin) 8 will move downward. Displaced to.

Therefore, as shown by the solid line in FIG. 2, even if the lever 4 is squeezed, the valve 3 cannot be opened. That is, even if the lever 4 is pulled by mistake before the nozzle is removed from the nozzle case and the nozzle tip is inserted into the oil receiving port 34, oil will not be discharged. When the displacement punch 7' is displaced downward, the switching protrusion 12' of the three-way valve 12
Press to switch this valve to open the communication path 11 to the atmosphere. Therefore, the negative pressure in the negative pressure generating chamber 5A returns to atmospheric pressure, and the diaphragm 6 returns to its downward concave state. When the nozzle tip pipe is inserted into the oil supply port 34 and the opening/closing ring 16 is slid against the spring 17 to open the air suction port 15', the negative pressure generating chamber 5A is opened.
is communicated to the atmosphere via the negative pressure compensating pipe 15.

When the nozzle is removed from the nozzle case and the lever 4 is not gripped, the diaphragm 6 is concave downward and the spindle 6' is passed through the displacement village 7' and the ball 6''.The lever 4 is pulled. When the lock is released (dash line position in Figure 2), the displacement punch 7' is released from the spring 7.
'', and is connected to the spindle 6' via the ball 6'' (the state shown in FIG. 1). At this time, the three-way valve allows the pipes 11 and 11' to pass through each other, but the negative pressure compensation line 1
Since air is sucked in from the entrance 15' of the diaphragm 6, the negative pressure in the negative pressure generating chamber 5A is compensated and the diaphragm 6 is not pulled upward. Then, when you squeeze lever 4, Benshin 3
' The valve 3 is pushed up to open the through passage 2 and start refueling. As refueling progresses, the liquid level in the tank to be refueled rises and the air suction port 15' is closed, or the nozzle tip pipe is carelessly pulled out from the replenishing oil port during refueling and the sliding ring 16
is pushed by the spring 17 to close the air suction port 15', the negative pressure in the negative pressure generating chamber 5A is no longer compensated, the diaphragm 6 is pulled up, the automatic valve closing mechanism 7 is operated, the valve 3 is closed, and the refueling is completed. will be stopped. At this time, since the switching protrusion 12' is pushed by the lowered displacement village 7', the three-way valve 12 cuts off the communication between the communication passages 11 and 11' and opens the communication passage 11 to the atmosphere.

Therefore, the oil sucked through the air suction port 15' is discharged, and the inside of the negative pressure generating chamber 5A returns to atmospheric pressure. on the other hand,
Since the communication passage 11' is closed, the reduced pressure in the communication passage 11' causes the pressure switch 33 to actuate and generate a signal indicating that the automatic valve closing mechanism has been operated. This signal can activate appropriate notification means. Although the embodiments have been described in detail above, it goes without saying that the present invention is not limited thereto. For example, instead of the three-way valve, a valve may be provided to open and close the lotus passages of the connections 11 and 11', and the communication path 11 may be provided with a small hole that is always open to the atmosphere.
This arrangement requires that the amount of air sucked through the small hole be smaller than the amount of air sucked in through the air inlet 15'. Exhaust pump 14 and oil pump 2
1 may be driven not by the same motor but by different motors, and these motors can be installed anywhere. The configuration of the automatic valve closing mechanism of the nozzle is also not limited to the illustrated example. As described above, according to the present invention, air bubbles are not mixed into the liquid supply, preventing the automatic valve closing mechanism from malfunctioning due to this, making it possible to quickly and accurately supply liquid, and also to enable low-speed liquid supply. Even in this case, reliable operation of the automatic valve closing mechanism can be guaranteed.

Further, according to the present invention, the nozzle tip pipe is provided with an air inlet opening/closing ring that normally closes the negative pressure compensating path of the automatic valve closing mechanism or the air inlet to the negative pressure generation chamber, and the nozzle tip pipe is connected to the replenishing oil inlet. Since the automatic valve closing mechanism remains closed unless the nozzle is inserted into the nozzle case, oil will not be discharged even if the lever is inadvertently pulled before removing the nozzle from the nozzle case and inserting the tip pipe into the supply oil port. In addition, since we have provided a flow path switching means to open the negative pressure compensation path or negative pressure generation chamber to the atmosphere when the automatic valve opening mechanism opens the valve, once the oil has been supplied, it is safe. Oil may be inconveniently sucked into the negative pressure generating means from the air suction port of the pipe at the tip and returned to the weighing machine, or oil remaining in the negative pressure compensation path may flow into the negative pressure generating chamber of the automatic valve closing mechanism, causing malfunction. You can avoid any inconvenience.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a liquid supply nozzle according to an embodiment of the present invention, showing a state in which the nozzle tip pipe is inserted into the replenishment liquid port, and Fig. 2 is a view similar to Fig. 1, with automatic valve closing. FIG. 3 is a diagram showing a state in which the mechanism is in operation, and is a schematic diagram of the structure of a liquid supply device in which the nozzles of FIGS. 1 and 2 are used. 2...Through flow path, 3...Valve, 4...
- Valve 3 operating lever, 5... diaphragm chamber,
5A...Negative pressure generation chamber, 6...Diaphragm, 6
'...Spindle, 6''...Ball, 7...Automatic valve closing mechanism, 7'...Displacement village, 7''...Spring, 8
...Pin (fulcrum), 9, 11, 11'...
...Connecting road, 10...Ring road, 12...
・Three-way valve, 13...Air hose, 14...
...Exhaust pump, 15...Passage compensation path, 15'
... Air suction port, 16 ... Air suction port opening/closing ring, 21 ... Oil pump, 22 ... Motor,
24, 30... Gas-liquid separator, 25... Flow meter, 26... Oil supply hose, 28... Nozzle case, 29... Nozzle switch, 33...
···pressure switch. Figure 2 Figure 1 Figure 3

Claims (1)

[Claims] 1. A through flow path, a valve disposed in this flow path, a mechanism for manually opening and closing this valve, an automatic valve closing mechanism that automatically closes the valve due to the generation of negative pressure, and this automatic valve closing mechanism. In a liquid supply device equipped with a liquid supply nozzle equipped with a negative pressure compensating path that communicates a negative pressure generation chamber with the atmosphere through an air suction port opening outward at the tip of the tip pipe, An air suction port opening/closing means is provided which normally closes the air suction port and opens the air suction port when the tip end of the pipe is inserted into the liquid receiving port, and the negative pressure compensating path or the negative pressure generating chamber is provided. is connected to a negative pressure generating means provided separately from the nozzle via a communication flow path, and when the automatic valve closing mechanism operates and the valve is closed, the negative pressure compensating path or the negative pressure generating chamber is connected to the negative pressure generating means provided separately from the nozzle. 1. A liquid supply device comprising a communication flow path switching means for cutting off communication between the negative pressure generating means and the negative pressure generating means and opening the negative pressure compensating path or the negative pressure generating chamber to the atmosphere.