JPS6212119B2 - - 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 refueling device, the tip of the fluid supply nozzle installed at the end of the hose is inserted into the mouth of the replenishment fluid tank to supply fluid, but when the tank is full (so-called full), the nozzle's built-in valve is automatically activated. A liquid supply nozzle with an automatic valve closing mechanism (so-called auto nozzle) that closes automatically 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 liquid supply, the through-flow path having the narrowed part functions as a ventilated tube and generates negative pressure in the diaphragm chamber via 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 supplied liquid tank is full and the opening at the end of the negative pressure compensating tube is closed by the rising liquid level, the negative pressure in the diaphragm chamber is no longer compensated for and this negative pressure causes the diaphragm to is displaced and the valve is closed.

By the way, the air sucked in from the opening at the tip of the negative pressure compensating tube is mixed into the liquid flowing through the constricted part of the nozzle passage through the nozzle, 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 suction 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.

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 a mechanism for automatically closing the valve by generating negative pressure. In the liquid supply nozzle, the through-flow An impeller that is rotationally driven by the flow energy of the liquid flowing through the flow path is provided in the flow path, and a negative pressure generating means that is driven by the rotational energy of the impeller to generate negative pressure is also provided. The present invention is characterized in that the negative pressure generated by the pressure generating means is introduced into the negative pressure compensating path or the negative pressure generating chamber.

The illustrated embodiment will be described 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 (chain line position) and closed state. It is possible to selectively set a position (solid line position) that allows this. A diaphragm chamber 5 is divided by a diaphragm 6 into an upper first compartment (negative pressure generating chamber) 5A and a lower second compartment 5B.

Reference numeral 7 designates an automatic closing mechanism for the valve 3, in which a spindle 6' is connected to the diaphragm 6 at the top, and a displacement rod 7' is connected to the base end of the lever 4 by a pin 8 at the bottom. 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 illustrated position, 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 a negative pressure generator 11, which will be described later, via a negative pressure compensation path 9 and a communication path 10.

The negative pressure compensating path 9 extends inside the nozzle tip pipe 1', and has an air suction port 9' at its tip that communicates with the outside (atmosphere) near the tip of the tip pipe 1'.

Reference numeral 12 denotes an impeller, which is installed near the base end of the tube end pipe 9' in the passage 2 of the nozzle, and is rotated by the flow energy of the liquid flowing in the passage 2, and its rotational torque is transmitted through the shaft 13. Negative pressure generator 1
1 and drives the negative pressure generator to generate negative pressure. 14 is a seal for the shaft 13, and 15 is an exhaust hole.

A known vacuum pump or blower can be used as the negative pressure generator.

In the above configuration, when the nozzle tip pipe 1' is inserted into the oil supply port (not shown) and the valve 3 is opened to start oil supply, the impeller 12 is rotated by the flow energy of the oil flowing through the flow path 2. The negative pressure generated by the negative pressure generator 11 is given to the negative pressure generation chamber 5A via the communication path 10 and the negative pressure compensation path 9, but from the air suction port 9' at the tip of the negative pressure compensation path 9. Since air is sucked in, the negative pressure in the negative pressure generating chamber 5A is compensated, and the diaphragm 6 is not pulled upward. Since the air sucked into the negative pressure generator 11 is released into the atmosphere from the exhaust port 15,
It will not mix with oil.

As refueling progresses and the oil level in the refueled tank rises and blocks the air suction port 9', the negative pressure in the negative pressure generating chamber 5A is no longer compensated, the diaphragm 6 is pulled up, and the automatic valve closing mechanism 7 is activated. valve 3 closes flow path 2.

Although one embodiment has been described above, it goes without saying that the present invention is not limited to this. For example, the impeller may be placed anywhere within the flow path 2. The specific configurations of the automatic valve closing mechanism and negative pressure generator do not matter. Also, the negative pressure compensation path is the nozzle tip pipe 1'.
It is not necessary to extend the inside, but the outside may be extended.

As described above, according to the present invention, since air bubbles are not mixed into the liquid supply, malfunction of the automatic valve closing mechanism can be prevented, and liquid can be supplied quickly and accurately. Then, in order to supply negative pressure to the automatic valve closing mechanism, an impeller is installed in the flow path inside the nozzle, and the impeller is rotated by the liquid flowing through the flow path, and the rotational force drives a negative pressure generator attached to the nozzle. As a result, the configuration can be made simple and compact without requiring a negative pressure supply hose extending from the nozzle.

[Brief explanation of the drawing]

The figure is a front view showing a main part of an embodiment of the present invention in longitudinal section. 1... Nozzle body, 2... Penetration channel, 3...
Valve, 4...Valve opening/closing operation lever, 5...Diaphragm chamber, 5A...Negative pressure generation chamber, 6...Diaphragm, 6'...Spindle, 6''...Ball, 7...
Automatic valve closing mechanism, 9... Negative pressure compensation path, 9'... Air suction port, 10... Connection path, 11... Negative pressure generator, 12... Impeller, 13... Shaft, 15... Exhaust hole .

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 nozzle having a negative pressure compensation path that communicates the negative pressure generation chamber with the atmosphere through an air suction port opened at the tip of the pipe,
An impeller that is rotationally driven by the flow energy key of the liquid flowing through the flow path is provided in the through flow path, and a negative pressure generator that is driven by the rotational energy of the impeller to generate negative pressure is also provided. A liquid supply nozzle, characterized in that the negative pressure generated by the negative pressure generator is introduced into the negative pressure compensation path or the negative pressure generation chamber.