JPS6268130A - Fuel inhaling device for fuel tank - Google Patents

Abstract

PURPOSE:To efficiently feed the fuel in a main chamber and a subchamber by forming an ejector part at the connection part of an introducing pipe for leading out a portion of the discharged fuel into a feed pump and a communication pipe whose one-edge opened port part is spread into tapered form and arranged onto the bottom part of a subchamber. CONSTITUTION:When a feed pump 5 is driven, the fuel in a main chamber 3 is supplied into a fuel feeding device from a feed pipe 7, filtered by a filter 6, and a portion of the discharged fuel is introduced into a lead pipe 8 from a communication port 5a. The fuel introduced into the lead pipe 8 is jetted forcibly into the tapered one-edge opened port part 9a of a communication pipe 9 from the other edge opened port part 8a at an ejector part 10 by the discharge pressure of the feed pump 5. Therefore, in the ejector part 10, the fuel in a subchamber 4 is inhaled into the one-edge opened port part 9a from the gap delta, and transported to the main chamber 3 side from the other-edge opened port part 9b. Therefore, the fuel in the main chamber 3 and the subchamber 4 can be supplied efficiently by the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fuel suction device t for a fuel tuck mounted on a vehicle such as an automobile.

Conventional technologyIn the fuel tank for automobiles, for example,
As shown in Publication No. 09921, due to the structure of the part where the fuel tank is mounted, an inward bulge is formed on the bottom wall of the tank body, and this bulge allows the tank body to Vehicles that avoid interference between the bottom wall and functional parts of the vehicle body are known.

Problems to be Solved by the Invention By forming a bulge on the bottom wall of the tank body, approximately the lower half of the tank body (the main compartment and the sub-chamber are separated, so that either of these compartments To prevent fuel from remaining in one side, the feed pipe is branched into the main chamber side pipe and the auxiliary chamber side pipe through a switching valve, and when the fuel in the main chamber is consumed, the switching valve is activated. Therefore, not only is a switching valve required, but in order to automatically switch and operate this switching valve, the main chamber and the subchamber ζ Each liquid level detection device i
It has been pointed out that this method requires a control unit and is extremely expensive.

Therefore, the present invention does not require dedicated parts such as a switching valve or its operation control unit, and can be used in the main chamber.

The present invention provides a fuel suction device for a fuel tank that can efficiently supply fuel in a subchamber.

Means for solving the problem: A feed pump is installed in the main chamber separated from the lower half of the tank body, and a guide pipe is connected to this feed pump to draw out a part of the discharged fuel. , a communication pipe is disposed across the sub-chamber and the main chamber, with an opening at one end tapered and disposed at the bottom of the sub-chamber, and an opening at the other end disposed at the top of the main chamber; The other end opening of the guide pipe is connected to the tapered one end opening of the communication pipe (this is provided with an arbitrary gap between the guide pipe and the communication pipe to constitute a heat ejector part). be.

Operation When the feed pump is driven, the fuel in the main chamber is led out to the fuel supply system via the feed pipe, and a portion of the fuel discharged from the feed pump is supplied to the guide pipe, and the ejector section flows through the guide pipe. Fuel is vigorously jetted from the other end opening toward the tapered one end opening of the communication pipe. Due to the jet of fuel from the other opening of the guide pipe, the fuel in the subchamber is sucked into the communication pipe from the gap between the other end opening of the guide pipe and the one end opening of the communication pipe, The water is fed into the main chamber through the opening at the other end of this communication pipe.

Example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a tank body, and an inwardly bulging portion 2 is formed approximately at the center of the bottom wall of the tank body 1, and a main chamber 3 is formed approximately at the lower half of the tank body 1. It is separated from the subchamber 4. A feed pump 5 is disposed in the main chamber 3, and when the feed pump 5 is driven, the fuel in the main chamber 3 is filtered by a filter 6, and is passed through a feed pipe 7 to The fuel is supplied to a fuel supply device. Further, a guide pipe 8 is connected to the feed pump 5 to lead out a part of the discharged fuel.

- The feed pump 51 has a communication port 5a at its bottom that communicates with an impeller chamber i (not shown) for priming water intake, and when the feed pump is driven, a part of the discharged fuel is discharged from this communication port 5a. Therefore, in this embodiment, this communication port 5a is effectively used, and one end of the guide pipe 8 is connected to the communication port 5ai, so that a part of the discharged fuel is led out.

Reference numeral 9 denotes a communicating pipe disposed across the sub-chamber 4 and the main chamber 3, one end opening 9a of which is widened in a tapered shape 11;1 and disposed at the bottom of the sub-chamber 4; The end opening 9b is arranged at the upper part of the main chamber 3. Then, the other end opening 8a of the guide pipe 8 is placed concentrically with the tapered one end opening 9a of the communication pipe 9 with an arbitrary gap δ,
A nigafta part 10 is formed at the part where the guide pipe 8 and the communication vibe 9 are glued together. Specifically, the configuration of the ejector section 10 is as shown in FIG. One end opening 9aI is connected to the formed holder part 9C to define the gap δ.In addition, as shown in FIG. 3, one end opening 9a is formed as a small chamber 9d, and the end It is also possible to arrange the other end opening 8a of the guide pipe 8 through the wall to ensure the gap δ, and to provide an inlet 9e at the bottom of the small chamber 9d.

With the structure of the embodiment described above, when the feed pump 5 is driven, the fuel in the main chamber 3 is filtered by the filter 6 and supplied from the feed pipe 7 to a fuel supply device (not shown), while a part of the discharged fuel is communicated. It is led out to the guide pipe 8 from the port 5a. Due to the discharge pressure ζ of the feed pump 5, the fuel led to the guide pipe 8 is forcefully ejected from the other end opening 8a of the ejector portion 10 to the tapered one end opening 9a of the communication pipe 9. Due to this jet flow of fuel, the fuel in the auxiliary chamber 4 is sucked into the tapered one end opening 9aj of the communication pipe 9 through the gap δ in the ejector section 10, and an ejector action occurs here, so that the fuel is communicated with the jetted fuel. It passes through the pipe 9 and is transferred from the other end opening 9b to the main chamber 3 side. Once such a fuel transfer action occurs, even if the feed pump 5 stops, if the fuel level in the main chamber 3M is lower than the fuel level in the auxiliary chamber 4 side (in this case, the communication pipe 9
Due to the siphon effect caused by +1, the above-mentioned fuel transfer is continued until the fuel level on the main chamber 3 side becomes the same level as the fuel level on the auxiliary chamber 4 side. In the opposite case, that is, Shuukan 3g! When the fuel level in A is higher than the fuel level in the auxiliary chamber 4 side, the siphon effect by the communication pipe 9 does not occur, so the main chamber 3
There is no backflow of fuel from the side to the subchamber 4 side. In the embodiment shown in FIG. By arranging the ejector part 10 in the turning tank 11 in this manner, when the remaining fuel level becomes low, the fuel level will change as shown by the dashed lines a and b in the same figure (even if the fuel level is tilted) due to sharp turns of the vehicle. The amount of fuel that can be sucked into the turn 411 can be secured, and the above-mentioned fuel transfer from the illll to the main 1311111 can be continued even during this sharp turn.

Effects of the Invention As described above, according to the present invention, fuel in the main chamber is delivered to the fuel supply device by driving the feed pump, and at the same time, fuel in the subchamber is smoothly transferred to the main chamber 11111 by the ejector action of the ejector section. In addition, since it does not require special selection parts as in the past, it is structurally simpler and has a practical effect of realizing a significant cost reduction. Has a puppy effect.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an example of an ejector section, FIG. 3 is a sectional view showing a different example of the ejector section, and FIG. 4 is a sectional view showing an example of the ejector section. FIG. 3 is a cross-sectional explanatory diagram showing main parts of different examples of the present invention. ■・・・tank body, 2・bulging part, 3・main chamber, 4・・i
+j room, s...feed pump, 8...guidance pipe, 8
a...Other end opening of the guide pipe, 9...Communication pipe, 9
a... One end opening of the communicating pipe, 9b... The other end opening of the communicating pipe, 10... Ejector portion, δ... Gap.

Claims (1)

[Claims] (1) In a structure in which a bulge is formed on the bottom wall of the tank body to separate a main chamber and a sub-chamber in substantially the lower half of the tank body, a feed pump is disposed in the main chamber, and , a guide pipe for guiding a part of the discharged fuel is connected to the feed pump, and one end opening is widened in a tapered shape and is disposed at the bottom of the sub-chamber, spanning the sub-chamber and the main chamber, and A communicating pipe is provided, the other end opening of which is disposed above the main chamber, and the other end opening of the guide pipe is provided adjacent to the tapered one end opening of the communicating pipe with an arbitrary gap therebetween. 1. A fuel suction device for a fuel tank, characterized in that an ejector part is formed in a part where a guide pipe and a communication pipe are connected.