JPS6371592A - Fuel feeder for vehicle - Google Patents

Abstract

PURPOSE:To stabilize fuel supply, by arranging a pump having two pump sections formed on a single impeller in a tank then communicating between the inside and the outside of a partition wall through one pump section while comnmunicating between the inside and the fuel feed section of an engine through the other pump. CONSTITUTION:Circumferential grooves 27, 29 are made in an impeller 26 so as to form a pump section. Low temperature fuel is discharged through the circumferential groove 29 and a communication path 33 to the inside section 4 of a partition wall 2. Fuel having suppressed temperature rise is fed from the inside section 4 of the partition wall 2 through the circumferential groove 27 and a delivery pipe 15 to the fuel supply section of an engine. Consequently, low temperature fuel at the outside of the partition wall is transported to the inside section thus suppressing the temperature rise at the inside section.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fuel supply system for a vehicle equipped with an in-tank turbine fuel pump.

<Prior Art> In recent years, in automobiles, as seen in Japanese Utility Model Application Publication No. 59-11.0373, a fuel injection valve or a carburetor, etc., which is a part for supplying fuel in the fuel tank to an engine, is installed in a fuel tank. Some models are equipped with an electric fuel pump to supply fuel.

In this type of in-tank fuel pump, an annular partition wall 2 is provided on the bottom wall 1a of the fuel tank 1, as shown in FIG.
The bottom space was divided into an outer part 3 and an inner part 4 by the partition wall 2, which were communicated through an orifice 5, and a fuel pump 6 was disposed in the inner part 4. (Refer to Utility Model Application Publication No. 1988-88057).

Moreover, as the fuel pump 6, there is a tendency recently to use a turbine type fuel pump which is a non-displacement type circumferential flow pump (see Utility Model Application No. 1-38952).

As shown in FIGS. 5 and 6, this turbine-type fuel pump 6 sucks fuel from a suction port 10 by an impeller 9 rotating around a shaft inside a pump housing 7, passes through a fuel pressure groove 11, and then passes through a discharge port. It is something that is exhaled from 12. Here, the impeller 9 and the fuel pressure feeding groove 11 constitute a pump section. In the turbine-type fuel pump 6, the fuel temperature rises due to friction of the fuel due to high-speed rotation and heat generated by the rotational drive of the fuel pump itself, and furthermore, the suction negative pressure acts, so fuel vapor is likely to be generated. . Therefore,
A vapor vent hole 13 is provided in the middle of the fuel pressure feeding groove 11 so that the fuel contained in the vapor is discharged toward the inner part 4 of the partition wall 2 erected on the bottom wall 1a of the fuel tank 1. .

In FIGS. 5 and 6, reference numeral 14 indicates a filter connected to the suction port 10, and reference numeral 15 indicates a lead-out vibrator constituting a fuel lead-out passage to the outside of the fuel tank 1.

<Problems to be Solved by the Invention> However, in such a conventional vehicle fuel supply system, the turbine type fuel pump 6 is rotated at a higher speed than the conventionally used roller vane type fuel pump, and , power consumption is high ((roller vane type,
3.0 to 3.5A, whereas the turbine type requires 7. O
A), and relatively high temperature return fuel containing vapor discharged from the vapor extraction hole 13 of the turbine-type fuel pump 6 is returned to the inner part 4 of the partition wall 2. A circulation is formed in which the fuel is immediately sucked in from the suction port of the fuel pump 6 and discharged from the vapor extraction hole 13, causing a problem that the fuel temperature within the inner portion 4 increases. As a result, vapor generation is accelerated and flow characteristics are deteriorated, and vapor is generated near the fuel injection valve, which may impede stable fuel supply. By the way, the fuel temperature is about 40℃ when using a roller vane type fuel pump, but it is about 50℃ when using a turbine type fuel pump.
The temperature can reach as high as 60℃.

Note that an orifice 5 is formed in the partition wall 2 to allow fuel to flow between the inner part 4 and the outer part 3 in order to reduce the rise in fuel temperature in the inner part 4, but the function of the partition wall ( 2. The orifice 5 cannot be formed too large, and when driving at a constant speed on a flat straight road, the wave motion of the fuel will be reduced. Since it is small and stable, the orifice 5 does not promote fuel exchange between the inner part 4 and the outer part 3 and has little effect on lowering the fuel temperature.

The present invention has been made by focusing on the problems of the conventional technology, and provides a vehicle fuel that can effectively suppress the rise in fuel temperature inside the partition wall provided upright on the bottom wall of the fuel tank. The purpose is to provide a feeding device.

<Means for solving the problem> For this reason, a turbine-type fuel pump is constructed with two pump parts each consisting of two fuel pressure grooves surrounding two circumferential grooves formed in one impeller. While the fuel pump is installed inside the fuel tank, the outer part and the inner part of an annular partition wall, which stands on the bottom wall of the fuel tank and divides the bottom space into inside and outside, are connected through one pump part. The inner portion of the partition wall and the fuel supply section of the engine were communicated via the other pump section.

With the above configuration adopted, when the impeller rotates, the low-temperature fuel on the outside of the partition wall is constantly transported to the inside part of the partition wall through one pump part, and the fuel on the inside part is Mixed with high temperature fuel to lower fuel temperature. Then, low-temperature fuel is supplied under pressure to the engine via the other pump section.

In this way, even if the calorific value of the turbine-type fuel pump is excessive and return fuel is discharged from the vapor vent hole,
Fuel temperature rise in the inner portion is suppressed. As a result, the flow characteristics deteriorate due to vapor.

There will be no obstruction to fuel supply to the engine.

<Example> 1 to 3 show one embodiment of the present invention.

Note that elements similar to those in the conventional example are designated by the same reference numerals as in FIGS. 4 to 6, and explanations thereof will be omitted.

Referring to FIGS. 2 and 3, fuel pump 19 used in the present invention is a turbine-type fuel pump having two pump parts.

To explain one pump section, a pump chamber 24 is formed in a pump housing 23 having a first suction port 20 and a first discharge port 22 communicating with a discharge port 21 of the turbine-type fuel pump. Inside 24 is the electric motor 2.
An impeller 26 that is rotatably driven by 5 is provided inside. A first circumferential groove 27 is formed in the circumferential direction of the impeller 26 at its peripheral edge. A first fuel pumping groove 28 is formed in the pump housing 23 so as to surround a part of the rotation area of the first circumferential groove 270 of the impeller 26 .

Regarding the other pump section, a second circumferential groove 29 is formed concentrically with the first circumferential groove 27 on the inner side surface of the circumferential edge of the impeller 26 . Similar to the first circumferential groove 27, the pump housing 23 has a second circumferential groove surrounding the second circumferential groove 29.
A fuel pressure feeding groove 30 is formed.

A second suction port 31 is formed at the starting point of the second fuel pressure feeding groove 30, and a second discharge port 32 is formed at the ending point.

Here, referring to FIG. 1, a communication passage 33 is connected to the second suction port 31 of the turbine-type fuel pump 20,
The communication passage 33 passes through the partition wall 2 and is in communication with the outer portion 3 of the partition wall 2. A filter 34 is provided at the tip of the communication passage 33.

Further, the discharge port 21 of the turbine-type fuel pump is connected to a fuel supply section of an engine (not shown) via a lead-out vibe 15.

Next, this effect will be explained.

When the electric motor 25 is rotationally driven, the impeller 26 rotates. Therefore, while the electric motor 25 is driving, the second circumferential groove 29 is always connected to the low-temperature fuel (20"
C) is guided from the second suction port 31 to the second fuel pressure feeding groove 30 via the communication passage 33, and is forcedly fed toward the second discharge port 32, and from the second discharge port 32 to the inner part 4 of the partition wall 2. Discharge. Therefore, the high-temperature fuel in the inner portion 4 is mixed with low-temperature fuel, so the temperature is lowered (by the way, as mentioned above, if low-temperature fuel is not mixed,
The temperature was 0°C, but due to the mixture, the temperature converged to approximately 40°C).

Therefore, generation of vapor due to temperature rise can be suppressed, and deterioration of flow characteristics can be prevented.

On the other hand, the fuel in the inner part 4 of the partition wall 2 whose temperature rise is suppressed as described above is transferred to the first suction port 2 by the first circumferential groove 27.
1 to the first fuel pumping groove 28 , pressure fed to the first discharge port 22 , and supplied to a fuel supply section (not shown) of the engine via the discharge pipe 15 . For this reason, vapor is less likely to be generated near the fuel injection valve, which is the part that supplies fuel to the engine, and fuel can be stably supplied to the engine.

In addition, as in the past, relatively high temperature fuel containing vapor is discharged from the vent hole 13 to the inner part 4 of the partition wall 2, but the temperature rise due to this is also caused by the fact that the fuel in the outer part Reduced by mixing.

In the embodiment, the communication passage 33 is formed by penetrating the partition wall 2. However, if the communication passage 33 is capable of sucking at least the low temperature fuel in the outer portion 3, the communication passage 33 can be formed by penetrating the partition wall 2.
It may be formed along.

<Effects of the Invention> As described above, according to the present invention, a fuel tank is provided with two pump parts each having two fuel pressure grooves surrounding two circumferential grooves forming one impeller. The outer part and the inner part of an annular partition wall erected on the bottom wall of the fuel tank and dividing the bottom space into inside and outside are communicated via one pump part, and the partition wall Since the inner part of the pump and the fuel supply part of the engine are communicated through the other pump part, the low-temperature fuel in the part outside the partition wall is constantly transported to the part inside the partition wall, and the rise in fuel temperature in the inner part can be suppressed. This improves the flow rate characteristics and stabilizes the fuel supply.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of one embodiment of the present invention, FIG. 2 is a sectional view of a turbine-type fuel pump used in the same, and FIG.
The figure is a view taken along the arrows ■-■ as above, FIG. 4 is an overall configuration diagram of a conventional vehicle fuel supply system, FIG. 5 is a sectional view of a conventional turbine-type fuel pump, and FIG. 6 is a VI-Vl same as above. It is an arrow view. DESCRIPTION OF SYMBOLS 1... Fuel tank 2... Partition wall 3... Outer part 4... Inner part 19... Turbine type fuel pump 20... First suction port 21... Discharge of turbine type fuel pump Outlet 22...First discharge port 24...Pump chamber 26...Impeller 2
7... First circumferential groove 28... First fuel pressure groove 2
9...Second circumferential groove 30...Second fuel pressure feeding groove 3
1...Second suction port 32...Second discharge port 33...
・Communication passage Fig. 2 ◇ Fig. 4 Fig. 5 Fig. 1 -Merikyudai-1, -111, -1111 l Fig. 6

Claims (1)

[Claims] In a vehicle fuel supply system comprising an annular partition wall erected on a bottom wall of a fuel tank and dividing a bottom space into inside and outside, and a turbine-type fuel pump installed inside the fuel tank, the fuel pump is configured as one. Two pump parts each include two circumferential grooves formed in the impeller and two fuel pressure grooves surrounding the circumferential grooves, and the outer part and the inner part of the partition wall are connected to one another. While communicating through the pump part of
A fuel supply device for a vehicle, characterized in that an inner portion of the partition wall and a fuel supply portion of an engine are communicated via the other pump portion.