JPH052830B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention supplies fuel in a fuel tank divided into a plurality of chambers to an automobile engine, etc. by a fuel pump disposed in one chamber of the fuel tank. The present invention relates to a fuel supply device configured to do so.

[Conventional technology]

A conventional fuel supply system of this type is shown in FIGS. 4-6. In the figure, 1 is a fuel tank with a two-chamber structure divided into a main tank chamber 1A and a sub-tank chamber 1B, 2 is a fuel pump arranged in the main tank chamber 1A by a bracket 3, and has a motor section 2a and a pump section 2b. It has a suction port 2c and a discharge port 2d. 4 is a suction pipe connected to the suction port 2c, 5 is a strainer provided at the tip of the suction pipe 4, and 6 is a discharge pipe connected to the discharge port 2d, which is connected to an automobile engine (not shown) or the like. 7 is a transfer pump installed outside the fuel tank 1, and has a suction port 7a and a discharge port 7b. 8 is suction port 7
The tip 8a of the suction pipe connected to the sub-tank chamber 1B opens into the sub-tank chamber 1B. 9 is a strainer provided at the tip 8a of the suction pipe 8, and 10 is a discharge pipe connected to the discharge port 7b, the tip 10a of which opens into the main tank chamber 1A. Reference numeral 11 denotes a float switch arranged in the sub-tank chamber 1B by a bracket 12, which controls the transfer pump 7. 13 is an air vent hole provided in the pump portion 2b of the fuel pump 2.

Next, the operation will be explained. The motor section 2a of the fuel pump 2 is energized to drive the pump section 2b, sucking fuel in the main tank chamber 1A through the suction port 2, and supplies this fuel to the engine through the discharge port 2d. The fuel in the sub-tank chamber 1B is transferred into the main tank chamber 1A through the suction pipe 8 and the discharge pipe 10 by driving the transfer pump 7. At this time, the float switch 11 prevents the transfer pump 7 from running idly. Note that a portion of the fuel is spouted from the air vent hole 13 during operation of the fuel pump 2.

[Problem that the invention seeks to solve]

In the conventional fuel supply device as described above, the fuel in the sub-tank chamber 1B is transferred to the main tank chamber 1A by the transfer pump 7, so the transfer pump 7 and the strainer 9 are required, and the idle operation of the transfer pump 7 is prevented. Float switch 1 to prevent
1 is required, which poses a problem in that it is expensive.

The present invention was made to solve such problems, and an object of the present invention is to provide a fuel supply system that is inexpensive because the transfer pump 7, strainer 9, and float switch 11 are not required.

[Means for solving problems]

The fuel supply device according to the present invention utilizes the negative pressure of the fuel ejected from the air vent hole of the fuel pump to suck the fuel in other chambers of the fuel tank and transfer it to one chamber of the fuel tank. .

[Effect]

In this invention, fuel in other chambers of the fuel tank can be sucked in by the negative pressure of the fuel ejected from the air vent hole and transferred to one chamber of the fuel tank.

[Embodiments of the invention]

1 to 3 are diagrams showing one embodiment of the present invention, and 1 to 6 are completely the same as the conventional device described above. 13A is an air bleed hole formed in a jet nozzle type, 14 is a jet opening that opens in the jetting direction of the air bleed hole 13A, 15 is a suction port that opens to the side of the air bleed hole 13A, and 16 is one end 16a of which is the suction port 1.
5 and the other end 16b is connected to the sub tank chamber 1B.
This is a transfer pipe that opens into the fuel tank 1, and is temporarily brought out of the fuel tank 1 to facilitate piping.

If the transfer pipe 16 is connected to the air bleed hole 13A in this way, when the fuel pump 2 is started, the air in the pump section 2b will be blown out from the air bleed hole 13A, and the fuel in the main tank chamber 1A will be pumped into the fuel pump. It is sucked in from the strainer 5 by the suction pipe 4 of No. 2.
Then, when fuel is ejected from the air vent hole 13A,
The fuel in the sub-tank chamber 1B is sucked by the negative pressure of this jetted fuel, enters the suction port 15 through the transfer pipe 16, and continues from the jet port 14 to the main tank chamber 1A.
is discharged. The fuel is sucked into the sub-tank chamber 1B, which has been transferred to the main tank chamber 1A, from the strainer 5, through the suction pipe 4, and into the fuel pump 2.

Furthermore, since the negative pressure of the fuel from the air vent hole, which was ejected in the conventional device, is utilized, the performance of the fuel pump 2 does not deteriorate.

Note that even if air or floating matter in the sub-tank chamber 1B is sucked into the transfer pipe 16 from the other end 16b, it will not enter the fuel pump 2 and will be released directly into the main tank chamber 1A, thus preventing air suction. There is no need to provide a device or strainer for this purpose. Further, in the above description, the fuel tank 1 has a two-chamber structure, but the same effect can be obtained even if the fuel tank has three or more chambers.

〔Effect of the invention〕

As explained above, this invention uses the negative pressure of the fuel ejected from the air vent hole of the fuel pump to transfer the fuel in the other chamber of the fuel tank to the one chamber where the fuel pump is located. This eliminates the need for a transfer pump, a strainer, and a float switch for transferring fuel, resulting in lower costs.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing one embodiment of the present invention, FIG. 2 is a vertical side view of a fuel pump, FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a vertical side view of a conventional device. FIG. 5 is a longitudinal side view of the fuel pump, and FIG. 6 is a bottom view of FIG. 5. In the figure, 1 is a fuel tank, 1A is a main tank chamber, 1B is a sub-tank chamber, 2 is a fuel pump,
2b is a pump section, 13A is an air vent hole, and 16 is a transfer pipe. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A fuel supply device configured to supply fuel in a fuel tank divided into a plurality of chambers to an automobile engine, etc. by a fuel pump disposed in one chamber of the fuel tank, wherein the fuel pump A pump having an air bleed hole is characterized in that the negative pressure of the fuel jetted out from the air bleed hole is used to suck the fuel in another chamber of the fuel tank and transfer it to the one chamber. fuel supply device.