JPS6251838B2 - - 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 is to prevent measurement errors caused by 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, which is isolated from the atmosphere and flows rapidly through the narrow space, is applied to the diaphragm chamber, the diaphragm is sucked and contracts, and the locking piece integrated with it moves to release the locking ball. There are nozzle valves that are released so that the trigger moves and the valve closes, stopping the supply of fuel.

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.
engage the trigger 3, and lock the locking ball 23 of the sliding rod 4 connected to the tip of the trigger 3 with the locking piece 5,
A ventilation pipe 9 having an opening 24 at the tip of the nozzle 8 to the diaphragm chamber 7 of the diaphragm 6 integrated with the locking piece 5
and the negative pressure tube 10 is opened.

In Figure 2, a vacuum pump 17 installed outside the supply oil piping is used as a negative pressure generator, and its suction pipe 18
is connected to a negative pressure tube 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.

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 the vacuum as a negative pressure generator The negative pressure generated by the pump 17 is applied to the chamber 7 via the suction pipe 18 and the negative pressure pipe 10, and the diaphragm 6 is sucked and curved, and the locking piece 5 integrated with it moves to close the sliding rod 4. Since the locking ball 23 of is released, the sliding rod 4 moves, and as a result, the pivot point of the trigger 3 moves.
Valve 2 closes and refueling stops.

The nozzle valve of this invention uses a vacuum pump that is installed outside the flow path for the negative pressure generation device applied to the diaphragm, instead of the conventional negative pressure generation section that is installed in a narrow part in the middle of the fuel oil flow path. Since there is no risk of air bubbles being mixed into the supplied oil and a large negative pressure can be obtained, the automatic closing operation of the valve is performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a nozzle valve of the present invention, and FIG. 2 is an explanatory diagram of a state in which a negative pressure generating device is connected to the nozzle valve. 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, 17 : Vacuum pump, 18: Suction tube.

Claims (1)

[Claims] 1. It has a trigger that engages with a valve provided in a flow path formed in a nozzle valve to open and close the valve, and is composed of a diaphragm that forms a diaphragm chamber and a clutch mechanism that is operated by this diaphragm. A nozzle valve having an engagement control means for a valve and a trigger, and having one end of a ventilation pipe and a negative pressure pipe opened at the tip of the nozzle valve to the diaphragm chamber, the other end of the negative pressure pipe being connected to a vacuum pump. A nozzle valve characterized by: