JPS5918544B2 - Fuel spill prevention device for vehicles, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel leakage prevention device for vehicles, etc., which is designed to prevent fuel in a tank from flowing out due to the siphon principle due to an obstruction such as an external hose.

Generally, when a fuel pipe, connecting hose, etc. is damaged or falls off due to a vehicle collision or for some other reason, even if the fuel pump is stopped, a large amount of fuel in the tank will flow out from the damaged part due to the siphon phenomenon. As a result, there was a risk of fire or explosion.

The present invention has been developed in view of these points, and the contents thereof will be explained below based on the illustrated embodiments.

Reference numeral 1 denotes a fuel tank, and a fuel pump 2 is installed inside the tank, but a pipe (not shown) communicating with the tank may be attached, or the fuel pump 2 may be placed outside the fuel tank.

Reference numeral 3 denotes a relief valve as a pressure regulating return valve, which is connected to the return discharge end 35 of the fuel return side pipe 13.

Reference numeral 30 denotes a hydraulic valve as a pressure sensing type stop valve, which is connected in series with the fuel pump 2, has an outlet side 6 connected to the fuel outlet side pipe 5, and has a three-way opening 31 connected to its tip.

A first opening 32 is connected to the fuel outlet pipe 5, an opening 33 is connected to a pipe 11 communicating with a carburetor 10 or a one-injector engine (not shown), and an opening 34 is connected to a pipe 11 that communicates with a carburetor 10 or a one-injector engine (not shown). A fuel return side pipe 13 returning to the fuel tank 1 is connected thereto.

The relief valve 3 is connected to the return and discharge end 35 of the fuel return pipe 13 within the fuel tank 1 .

A feature of this pipeline is that the pressures of the fuel outlet side pipe 5 and the fuel return side pipe 13 are maintained at the same pressure, so that even if there is a leak from any part of the fuel pipeline, it can be detected.

For this purpose, the relief valve 3 is connected to the return discharge end 35 of the fuel return side pipe 13, and the connection branch between the fuel outlet side pipe 5, the fuel return side pipe 13, and the carburetor 10 is established in three directions without using an orifice. The attached opening body 31 is used.

A pump circuit 40 connected to the power source 13A has a conductor 41 connected to the fuel pump 2, and operates the fuel pump 2.

Reference numeral 47A is a battery connected to an engine switch 47B, a warning lamp 47C1, and a conductor pipe 50 in the hydraulic valve 30 via a conductor 47 to supply electricity.

Next, the hydraulic valve 30 will be explained.

A conductor pipe 5 is placed in the center of the body 49 made of insulating material.
0 is embedded, and a conductive wire 47 is provided on the outer periphery of the pipe 50.
Wrap a part of it around and connect it.

51 is a diaphragm shaft with a sealing material 5 on its upper part.
2 is attached to the center thereof, and a spring 53 and a metal cover 54 are attached by pins 55.

56 is a diaphragm, 57 is a spring, 58 is a body cover, 59 is a fuel inlet, 60 is a fuel pressure chamber, and 61 is a contact portion of the pipe 50.

Thus, the fuel 19 sent from the fuel pump 2 enters the fuel pressure chamber 60 from the fuel population 59.

At this time, the diaphragm 56 is pushed down against the expansion force of the spring 57, so the body valve part 62 opens and the fuel 19 passes through the body valve part 62, passes through the outlet side 6, and flows out into the fuel outlet pipe 5. .

This state continues under normal conditions.

Next, the operating mode of this embodiment will be explained.

If a fuel leak occurs from the fuel transport line such as the fuel outgoing side pipe 5 or the fuel return side pipe 13, the pressure in the line will drop, so the pressure in the fuel pressure chamber 60 of the hydraulic valve 30 will drop, and the arrow mark of the spring 57 will drop. Since the pushing force in this direction prevails, the diaphragm 56 moves upward together with the diaphragm shaft 51, and the metal cover 54 and the pipe 50 come into contact as shown in FIG.

At that time, a ground circuit for the alarm lamp 47C is established and the alarm lamp 47C is turned on.

On the other hand, as the diaphragm 56 moves upward, the sealing material 52 joins with the annular body valve portion 62 and closes the valve opening portion 63.

Therefore, it is possible to prevent the fuel 19 from flowing out at the base.

Incidentally, the circle mark in FIG. 3 indicates the direction in which the current flows.

When the aforementioned leakage point is repaired and the starter is operated again, power is supplied to the power source 13A fuel pump 2, so the fuel pump 2 is operated and the diaphragm 5 of the hydraulic valve 30 is activated.
6 to open the valve port 63.

Therefore, the present invention has a structure and function similar to that of an inclined top. In particular, since the pressures of the fuel outlet side pipe 5 and the fuel return side pipe 13 are made to be approximately the same pressure, it is possible to connect from any part of the fuel pipeline. This has a great effect in that even if fuel leaks, the hydraulic valve can be immediately closed to prevent fuel from flowing out from the fuel tank.

[Brief explanation of the drawing]

Figure 1 is a general schematic diagram of the present invention, Figures 2 and 3 are longitudinal sectional views of the hydraulic valve, Figure 2 shows the valve in its open state with no fuel leakage and fuel is being supplied, and Figure 3 indicates that there is a fuel leak and the valve is closed. 1...Fuel tank, 2...Fuel pump, 30...
Hydraulic pressure valve, 5... fuel outlet side pipe, 13... fuel return side pipe.

Claims (1)

[Claims] 1 In the fuel cycle line where fuel is delivered from the fuel tank and the remaining fuel returns to the fuel tank after doing work, a pressure-sensing hydraulic valve is connected to the fuel pump, and the outlet side of the hydraulic valve is connected to the fuel pump. while connecting it with the fuel outlet side pipe,
The fuel outlet side pipe, the load, and the fuel return side pipe are connected to a separately provided three-way opening body, and a relief valve as a pressure adjustment return valve is connected to the return discharge end of the fuel return side pipe. A fuel outflow prevention device for vehicles, etc., which maintains substantially the same pressure between the fuel outlet side pipe and the fuel return side pipe.