JPS6215440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid supply nozzle installed in a liquid 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 A liquid supply nozzle with an automatic valve closing mechanism (so-called auto nozzle) that automatically closes the valve is generally used.

The most common configuration of this automatic valve closing mechanism is
Negative pressure is generated in a chamber containing a diaphragm connected to the opening/closing operating lever of the nozzle built-in valve through an appropriate element, and the resulting displacement of the diaphragm displaces the fulcrum of the operating lever, thereby opening and closing the nozzle built-in valve. I'm trying to close it.

In the conventional configuration, the diaphragm chamber is communicated with the narrowed part of the through-flow channel in the nozzle via a communication channel, and this communication channel is communicated with a negative pressure compensating pipe that opens to the outside (atmosphere) at the tip of the nozzle. . Therefore, when the liquid flows through the through-flow path in the nozzle due to the liquid supply, the through-flow path having the constricted portion functions as a bench lily pipe, and negative pressure is generated in the diaphragm chamber through the communication path. The negative pressure is compensated by the air sucked in from the negative pressure compensating pipe, and the displacement of the diaphragm and therefore the closing of the valve built into the nozzle is prevented.
As is well known, when the opening at the tip of the negative pressure compensating tube is closed due to the rising liquid level in the supplied liquid tank, the negative pressure in the diaphragm chamber is no longer compensated and the diaphragm is displaced by this negative pressure. The valve is 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 rise up, the bubbles block the opening (air intake port) of the negative pressure compensating pipe at the tip of the nozzle and activate the automatic valve closing mechanism, even though the tank is not full. This will close the nozzle's built-in valve. 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 bench lily 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 built-in valve disposed in this flow path, a mechanism for opening and closing this valve using a manual lever, and an automatic mechanism for automatically closing the valve. a diaphragm that partitions a negative pressure chamber and can take a negative pressure generation position and a non-negative pressure generation position, and the automatic valve closing mechanism is related to the diaphragm and the manual lever. It consists of a displacement rod provided and a negative pressure compensating path that communicates the negative pressure chamber with the atmosphere through an air suction port opening outward at the tip of the pipe, and the displacement rod is connected to the diaphragm that generates non-negative pressure. When the diaphragm is in the negative pressure generation position, displacement is regulated and the built-in valve can be opened by operating the manual lever, and when the diaphragm is in the negative pressure generation position, it is freely displaceable and can be opened by operating the manual lever. In the liquid supply nozzle configured to make it impossible to open the built-in valve, an injector-type negative pressure generator operated by compressed air disposed at or near the nozzle, and compressing the negative pressure generator. a compressed air supply conduit connecting to an air source; a negative pressure supply conduit connecting the negative pressure side of the negative pressure generator to the negative pressure compensation path or the negative pressure chamber; and the compressed air supply conduit or the negative pressure The present invention is characterized in that it also includes a valve mechanism that is inserted into either one of the supply pipes and is closed by the displacement rod of the automatic valve closing mechanism when the displacement rod is displaced.

The illustrated embodiment will be described in detail below.

1 is the nozzle main body, 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 Fig. 1). ) and a position (solid line position in FIG. 1) allowing the closed state can be selectively set. A diaphragm chamber 5 is divided by a diaphragm 6 into an upper first compartment (negative pressure chamber) 5A and a lower second compartment 5B.

7 is an automatic valve closing mechanism of the valve 3, in which a spindle 6' is connected to the diaphragm 6 on one side, and a displacement rod 7' is connected to the base end of the lever 4 by a pin 8 on the other side. The pin 8 forms the fulcrum of the lever 4. 6'' is a ball connecting the spindle 6' and the displacement rod 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 rod 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 reason, the first compartment 5A
is connected to the compressor 14 via the connecting passage 9, the annular passage 10, the connecting passage 11, the negative pressure generator 12, the connecting passage 11' and the air hose 13.

Reference numeral 15 denotes a negative pressure compensating path inserted into the nozzle tip pipe 1', which has an air suction port 15' at its tip that communicates with the outside (atmosphere) near the tip of the nozzle tip pipe 1', and its rear end is connected to the It communicates with the annular passage 10 and thus with the negative pressure chamber 5A.

Reference numeral 16 denotes an air suction port opening/closing ring which is slidably attached to the tip of the tube tip pipe 1'.
5' to the closed position. Reference numeral 18 denotes a member for removing the opening/closing ring 16.

Referring to FIG. 3, 19 is a housing of a ground-mounted oil supply system, and 20 is an oil suction pipe that communicates with an underground oil storage tank (not shown). 21 is an oil pump, and 22 is a motor that drives the oil pump 21 and the compressor 14 mentioned above.

23 is an oil supply pipe, 24 is a flow meter, 25 is an oil supply hose that sends the oil measured by the flow meter to the through passage 2 of the nozzle 1, and 26 is a count display connected to the output of the flow meter 24.

27 is a nozzle case, and 28 is a nozzle switch which generates an energizing signal for the motor 22 when the nozzle is removed from the nozzle case 27.

Reference numeral 30 denotes a connecting member fitted to the end of the nozzle body 1, into which a hose nipple 31 is fitted so as to be rotatable around the axis but cannot be removed.
A hose 25 is fitted into this hose nipple 31. A connecting member 30 is attached to the hose nipple 31.
An annular member 32 is fitted onto the outer periphery at a position in contact with. A connecting member 33 fixed to the lower side of the annular member 32 is fixed to the end surface of the nozzle body 1 by a screw 33'.

The connecting member 33 is provided with a communication passage 33'', one end of which communicates with the communication passage 11', and the other end communicates with the passage 32' provided in the annular member 32.
and the communication path 3 of the hose nipple 31 via an annular groove 34 provided on the outer peripheral surface of the hose nipple 31.
1'. The communication path 31' is connected to the air hose 1
Connected to 3. The air hose 13 is arranged within the refueling hose 25 and connected to the compressor 14.

The hose nipple 31 and therefore the hoses 25 and 13 are rotatable around the axis relative to the annular member 32 and the connecting member 30 and therefore the nozzle body 1,
Moreover, no matter what rotational position the hose 25 is in with respect to the nozzle 1, the presence of the annular groove 34 ensures that the communication path 3
3'' and thus 11' are maintained in communication with the communication channel 31' and thus the air hose 13.

FIG. 4 shows an example of the negative pressure generator 12. The negative pressure generator 12 includes a three-way valve 35 and a negative pressure generator 36. One port A of the three-way valve 35 is connected to the communication path 11'
The other port B communicates with an injection nozzle 37, and the nozzle 37 opens into a ventilate portion 38 which communicates with the communication passage 11, and the tip of the ventilate portion 38 communicates with the atmosphere. A whistle 39 is attached to the third port C of the three-way valve 35.

In the above configuration, when the nozzle 1 is removed from the nozzle case 27, the nozzle switch 28 is closed, the motor 22 is energized, and the oil pump 21 and compressor 14 are operated. At this time, assuming that the lever 4 is not pulled, port A is connected to B in the three-way valve 35.
The compressed air from the compressor 14 passes through the valve 35 from the communication path 11', and is sucked from the nozzle 37 to the ventilate section 38 via the communication path 11. At this time, opening and closing ring 1
6 closes the air suction port 15' of the negative pressure compensation path 15, negative pressure is generated in the negative pressure chamber 5A, and the diaphragm 6 is pulled up. 6' is also pulled up and the connection with the displacement rod 7' by the ball 6'' is released.

Therefore, even if the lever 4 is squeezed in this state, the lever 4 will rotate counterclockwise around the contact point P with the valve stem 3' as a fulcrum, the displacement rod 7' will descend, and the fulcrum (pin) 8 will move. Displaced downward. Therefore, even if the lever 4 is squeezed as shown in FIG. 2, 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 29, oil will not be discharged.

When the displacement rod 7' is displaced downward, its lower end pushes the switching protrusion 35' of the three-way valve 35 of the negative pressure generator 12, switching the port A of the valve 35 from B to C and making it open. The compressed air is a whistle 39
sound.

On the other hand, since the air is no longer blown out from the nozzle 37, the negative pressure in the communication passage 11 and therefore in the negative pressure chamber 5A returns to atmospheric pressure, and the diaphragm 6 is returned to its concave position downward by the spring S.

When the nozzle tip pipe is inserted into the oil supply port 29 and the opening/closing ring 16 is slid against the spring 17 to open the air suction port 15', the negative pressure chamber 5A communicates with the atmosphere via the negative pressure compensating pipe 15. . In this case, unless the nozzle is removed from the nozzle case and the lever 4 is grasped (pulled), the diaphragm 6 will be concave downward. When the lever 4 is released from the pulled state, the displacement rod 7' is returned upward by the spring 7'' and is connected to the spindle 6' via the ball 6'' (see Fig. 1). situation). At this time, three-way valve 3
5 connects the pipe line 11' to the nozzle 37 to operate the negative pressure generator 36, but since air is sucked in from the opening 15' of the negative pressure compensating pipe 15, the negative pressure chamber 5A
The negative pressure inside is compensated and the diaphragm 6 is not pulled upwards. When the lever 4 is squeezed, the valve 3 is pushed up via the valve stem 3' (to the chain line position in FIG. 1), opening the through passage 2 and starting oil supply.

As refueling progresses, the liquid level in the refueling tank rises and the air suction port 15' is closed, or the nozzle end pipe is carelessly pulled out from the refueling port during refueling, and the sliding ring 16 is pushed by the spring 17 and air is sucked in. Mouth 1
5' (FIG. 2), the negative pressure in the negative pressure 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 oil supply is stopped.

At this time, the lowered displacement rod 7' pushes the switching protrusion 35', so the three-way valve 35 cuts off communication of the communication passage 11' with the nozzle 37, stops the operation of the negative pressure generator 36, and the communication passage 11 Return to atmospheric pressure. Therefore, a small amount of oil sucked through the air suction port 15' is discharged, and the inside of the negative pressure chamber 5A returns to atmospheric pressure.

On the other hand, the compressed air from the communication path 11' is supplied to the three-way valve 3
The signal is sent to port C of No. 5, and a whistle 39 provided at the tip thereof is sounded. This notifies the user that the liquid supply has been stopped.

Although one embodiment has been described in detail above, it goes without saying that the present invention is not limited thereto. For example, the compressor 14 and the oil pump 21 may be driven not by the same motor but by separate motors, and these motors can be installed anywhere. The configuration of the free valve closing mechanism of the nozzle is also not limited to the illustrated example. In the illustrated example, the valve 35 is provided in the compressed air supply path 11', but
If the whistle is not used, the valve 35 may be inserted into the negative pressure supply path 11. Further, the switching protrusion 35' may be moved by the front end (left end in the figure) of the valve stem 3 or lever 4.

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, pressurized air is used to drive the negative pressure generator, and the negative pressure generator is arranged at or near the nozzle to provide a negative pressure chamber or negative pressure compensation between the negative pressure generator and the nozzle. Because the distance from the nozzle is shortened, there is no need for a thick and long suction hose, unlike when using a negative pressure source located far from the nozzle, and a relatively thin hose is required to send compressed air, making handling easier. becomes easier. In addition, the pressure of the pressurized air can be increased as needed, making it possible to efficiently generate negative pressure.Furthermore, by sending high-pressure air that is even higher than during normal use, the negative pressure compensation path is not blocked. Even if the chamber is not closed, it is possible to close the automatic valve closing mechanism by applying negative pressure to the same level as when the chamber is closed. It can be used for what is called a preset refueling stop.

Furthermore, in the present invention, when the automatic valve closing mechanism closes the valve, the supply of negative pressure to the negative pressure compensation path or the negative pressure chamber is cut off, so that the liquid once supplied flows from the suction port at the tip of the nozzle to the negative pressure compensation path. You can eliminate the inconvenience caused by being sucked in through the air.

[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 liquid supply port, and Fig. 2 is a view similar to Fig. 1, showing the automatic valve. Figure 3 showing the state in which the closing mechanism is in operation
The figure is a schematic diagram of the structure of a liquid supply device in which the nozzles of FIGS. 1 and 2 are used, and FIG. 4 is a schematic diagram showing an example of negative pressure generating means. 2...Through flow path, 3...Valve, 4...Operation lever for valve 3, 5...Diaphragm chamber, 5A...Negative pressure chamber, 6...Diaphragm, 6'...Spindle, 6''...Ball, 7
... Automatic valve closing mechanism, 7'... Displacement rod, 7', S... Spring, 8... Pin (fulcrum), 9, 11, 11', 3
1', 33''...Connection path, 10...Annular path, 12...Negative pressure generator, 13...Air hose, 14...Compressor, 15...Negative pressure compensation path, 15'...Air suction port, 1
6... Air suction opening/closing ring, 21... Oil pump, 22...
Motor, 24...Flowmeter, 25...Refueling hose, 27
...Nozzle case, 28...Nozzle switch, 30,
33...Connection member, 31...Hose nipple, 32...
Annular member, 32'... passage, 34... annular groove, 35...
Three-way valve, 35'... switching protrusion, 36... negative pressure generation part,
37... Nozzle, 38... Bench lily part, 39... Whistle,
A, B, C...Valve ports.

Claims (1)

[Claims] 1. A through flow path, a built-in valve disposed in this flow path,
This valve has a mechanism that opens and closes the valve using a manual lever, and an automatic valve closing mechanism that automatically closes the valve. A diaphragm that can assume a position when pressure is generated; a displacement rod that is connected to the diaphragm and the manual lever; a negative pressure compensation path communicating with the diaphragm, the displacement of the displacement rod is regulated when the diaphragm is in the non-negative pressure generation position, and the built-in valve can be opened by operating the manual lever; A liquid supply nozzle configured such that the diaphragm is displaceable when the diaphragm is in a negative pressure generation position and is configured to make it impossible to open the built-in valve by operating the manual lever, the liquid supply nozzle being disposed at or near the nozzle to supply compressed air. An injector-type negative pressure generator operated by
a compressed air supply pipe connecting the negative pressure generator to a compressed air source; a negative pressure supply pipe connecting the negative pressure side of the negative pressure generator to the negative pressure compensation path or the negative pressure chamber; and the compressed air. and a valve mechanism that is inserted into either the supply pipe or the negative pressure supply pipe and is closed by the displacement rod of the automatic valve closing mechanism when the displacement rod is displaced. A liquid supply nozzle characterized by: