JPS6251837B2 - - Google Patents

Description

Detailed Description of the Invention The nozzle valve of the present invention is a nozzle valve that automatically closes the valve and cuts off the oil supply when the oil supply surface reaches the tip of the nozzle. This prevents errors from occurring due to contamination.

Conventionally, there is a nozzle valve that connects the diaphragm chamber that locks the valve opening trigger, the narrow part in the middle of the flow path, and the nozzle tip with a ventilation pipe, and this nozzle valve is used in automobiles. After inserting it into the tank's inlet, when you pull the trigger, fuel oil is discharged and refueled.The oil level in the tank gradually rises and when it reaches the vent pipe opening at the tip of the nozzle, the vent pipe opens. Negative pressure generated by the fuel oil that is shut off from the atmosphere and flowing rapidly through the narrow area is applied to the diaphragm chamber, causing the diaphragm to be sucked and contracted, and the locking piece integrated with it moves to lock the locking ball. There is a nozzle valve that moves the trigger to close the valve and stop the fuel supply.

The disadvantage of the above nozzle valve is that when fuel oil (especially light oil) passes through a narrow space, air is sucked in from the vent pipe, which mixes into the fuel oil and creates air bubbles, which then rise above the oil surface in the tank. There is an inconvenience in that fuel oil swells up, overflows from the injection port, or blocks the opening of the vent pipe, causing the valve to be closed and fuel supply to be stopped even though the tank is not filled with fuel oil.

The nozzle valve of this invention eliminates the above-mentioned drawbacks. Next, the structure of the nozzle valve will be explained with reference to FIG.
The trigger 3 is engaged with the trigger 3, and as a means for controlling the engagement between the valve 2 and the trigger 3, a locking piece 5 is provided which acts as a clutch using the locking ball 23 of the sliding rod 4 connected to the tip of the trigger 3. A diaphragm 6 that locks with the locking piece 5 and is integrated with the locking piece 5
An opening 2 is provided at the tip of the nozzle 8 to the diaphragm chamber 7 of the
4, the ventilation pipe 9 and negative pressure pipe 10 are opened.

Next, to explain the negative pressure generator with reference to FIGS. 2 and 3, a tank 25, a pump 26, a large volume slow flow chamber 13, a flow meter 27, and a nozzle valve 1 are successively connected by piping 12.

A pump 26 is connected to the upper part of the slow flow chamber 13 through an air separation chamber 15 with a small diameter conduit 14 which becomes a negative pressure generating section.
A reflux pipe is formed by connecting to the suction side of the A branch pipe 16 is opened to the conduit 14 and connected to the negative pressure pipe 10.

Next, to explain the operation, if the nozzle 8 is inserted into the tank's injection port 11 and the trigger 3 is pulled, the valve 2
is opened and fuel oil is supplied from the nozzle 8 to the tank.

On the other hand, fuel oil also flows into the conduit 14 from the slow flow chamber 13, and a negative pressure is generated in the branch pipe 16 due to the fuel oil flowing rapidly through the conduit 14.

Although the negative pressure tube 10 opens into the diaphragm chamber 7, since the chamber 7 communicates with the atmosphere through the ventilation tube 9, no negative pressure is applied to the chamber 7, and therefore the diaphragm 6 is not sucked.

Now, when the oil level of the fuel oil in the tank gradually rises and reaches the inlet 11 and blocks the opening 24 of the vent pipe 9, the diaphragm chamber 7 is cut off from the atmosphere, so that no gas is generated in the small diameter conduit 14. A large negative pressure applied to the chamber 7 via the negative pressure pipe 10 causes the diaphragm 6 to be sucked and curved, and the locking piece 5 integrated therewith moves to lock the locking ball 23 of the sliding rod 4. is released, the sliding rod 4 moves, and as a result, the pivot point of the trigger 3 moves, so the valve 2 closes and oil supply stops. Note that even if the fuel oil flowing in the conduit 14 sucks air from the branch pipe 16 at this time, this fuel oil enters the air separation chamber 15 where it is separated into gas and liquid, and then flows into the suction side of the pump 26. Therefore, fuel oil with bubbles is not supplied to the flow meter 27 or the nozzle valve 1 as it is.

In the nozzle valve of the present invention, the device for generating negative pressure applied to the diaphragm is provided with a reflux pipe on the inflow side of the piping of the flowmeter, and generates negative pressure with the fuel oil flowing inside the reflux pipe. Even if air bubbles are mixed into the oil, the recirculated oil is not directly supplied to the nozzle valve, so it does not affect its automatic closing operation, and it is not supplied to the flow meter, so there is no risk of mismeasurement.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of the nozzle valve of the present invention, Fig. 2 is an explanatory diagram of the negative pressure generating device connected to the nozzle valve, and Fig. 3 is a partially cutaway front view of the negative pressure generating device. be. 1: Nozzle valve, 2: Valve, 3: Trigger, 4: Sliding rod, 5: Locking piece, 6: Diaphragm, 7: Diaphragm chamber, 8: Nozzle, 9: Ventilation pipe, 10: Negative pressure pipe, 12 : Piping, 13: Slow flow chamber, 14: Piping,
16: Branch pipe.

Claims (1)

[Claims] 1 A valve and a trigger, which has a trigger that opens and closes the valve by engaging with the valve provided in the flow path of the nozzle valve, and is composed of a diaphragm forming a diaphragm chamber and a clutch mechanism operated by the diaphragm. A nozzle valve having a means for controlling engagement with gold, and having one end of a ventilation pipe and a negative pressure pipe opened at a tip of the nozzle valve to the diaphragm chamber,
A pump, a slow flow chamber, a flow meter, and a nozzle valve are sequentially connected with piping, and an air separation chamber whose lower part is connected to the pump suction side via a float valve and whose upper part is open to the atmosphere is used to supply small-diameter reflux to the slow flow chamber. A nozzle valve, characterized in that the valve communicates with a pipe, and the other end of the negative pressure pipe is opened in the middle of the reflux pipe.