JPS6385255A - Fuel intake device of fuel tank - Google Patents

Abstract

PURPOSE:To simplify the construction of a fuel intake device formed on the bottom wall of a tank with a bulge to divide the interior of tank into main and auxiliary chambers and transfer fuel in the auxiliary chamber to the main chamber side by the ejector action using return fuel in an ejector section having a built-in dispersing unit. CONSTITUTION:When a feed pump P is driven, fuel in the main chamber 3 is supplied to a combustion supply device through a feed pipe 5 and superfluous fuel is returned to a tank body 1 through a return pipe 7. When fuel is then jetted from a nozzle 8 constituting a portion of an ejector section 13 at the end of return pipe 7, negative pressure is produced in a chamber 9 to suck fuel in an auxiliary chamber 4 into the chamber 9 through a communicating pipe 12 and supply the fuel to the main chamber 3 through a throttle section 10. Then, fuel jetted from the nozzle 8 is swirled by a swirling piece 100 and dispersed conically to close a tapered opening 11 so that the negative pressure in the chamber 9 is prevented from leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a fuel suction device for a fuel tank 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, the main chamber and the sub-chamber are separated from each other in the substantially lower half of the tank body. To prevent fuel from remaining in either 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. It is necessary to do so so that the fuel in the pre-chamber can be fed together. For this reason, not only is a switching valve required, but in order to automatically switch the switching valve, a liquid level detection device is required in each of the main chamber and sub-chamber, and a control unit is also required. It has been pointed out that there are defects that make it extremely expensive.

SUMMARY OF THE INVENTION Therefore, the present invention provides a fuel suction device for a fuel tank that does not require dedicated parts such as a switching valve or its operation control unit, and can efficiently supply fuel into a main chamber and an auxiliary chamber. be.

Measures to solve the problem include arranging the suction port of the feed pipe in the main chamber separated from the lower half of the tank body, and forming a chamber at the end of the return pipe protruding into the tank body. , a nozzle protruding into the chamber is formed at the end of the return pipe, a diffusion device for diffusing and ejecting the fuel is provided in the nozzle, and a constriction part is provided below the nozzle of the chamber, and a constriction part is connected to the constriction part. forming a tapered opening, and disposing the tapered opening in the main chamber, while communicating and connecting a communication pipe with one end opening disposed near the bottom of the sub-chamber to the nozzle circumferential side of the chamber; An ejector portion is configured at the connection portion between the chamber and the communication pipe.

When the feed pump is activated, the fuel in the main chamber is sucked through the suction port of the feed pipe and supplied to the fuel supply device, and excess fuel is returned to the tank body via the return pipe.

The surplus fuel returned from the return pipe is forcefully ejected from the nozzle in the ejector section due to the discharge pressure of the feed pump. This jetting of fuel creates a negative pressure around the nozzle of the chamber, and the fuel in the auxiliary chamber is sucked into the chamber through the communication pipe, and the flow velocity is increased by the throttle part along with the jet from the nozzle. It is fed into the main chamber through the tapered opening.

Here, due to the diffusion device provided in the nozzle, the fuel ejected from the nozzle is diffused and injected in a cone shape onto the inner wall of the constriction section below the nozzle, and the air from the tapered opening following the constriction section is injected. Prevent inhalation.

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

In FIGS. 1 and 2, 1 indicates a tank body, and a bulge 2 is formed inward at approximately the center of the bottom, and a main chamber 3 is formed at approximately the lower half of the tank body 1. and an auxiliary chamber 4 are separated from each other. A feed pump P is attached to the lower end of the feed pipe 5 in the main chamber 3, and a filter 6, for example, is disposed at the suction port of the feed pump P. Fuel filter 6
It is shown that the fuel is filtered by the filter and fed to a fuel supply device, which will be described later, via a feed pipe 5. Reference numeral 7 denotes a return pipe which is disposed protrudingly within the tank body 1 and returns surplus fuel that is not consumed by the fuel supply device into the tank body 1, and a chamber 9 is formed at the end of the return pipe 7. . A nozzle 8 protruding into the chamber 9 is formed at the end of the return pipe 7, and
A constriction part 10 is formed below the nozzle 8 of the chamber 9, followed by a tapered opening 11, and this tapered opening 11 is disposed within the main chamber 3.

Here, a swirling piece 100 is provided inside the nozzle 8 as a diffusion device that swirls and diffuses the fuel ejected from the tip of the nozzle 8.

This turning piece 100, as shown in FIGS. 3 to 9,
The base piece 100 is composed of a base piece 1ooa and a pair of wings 10011 that extend from the base piece 100a and twist around each other to the other base.
By arranging a on the upstream side, it appears that the fuel is swirled by distributing the fuel to the front and back sides of each wing portion 100). t2 is a communication pipe having one end opening 121L disposed near the bottom of the auxiliary chamber 4, and this communication pipe 12 is connected to the circumferential side of the nozzle 8 of the chamber 9, and the communication pipe 12 is connected to the chamber 9. An ejector section 13 is configured at the connection portion with the.

In this embodiment, the ejector part 13 is composed of an ejector main body 13a that integrates the chamber 9, the constriction part 10, and the taper opening 11, the nozzle 8, the port 7a of the return pipe 7, and the port 12b of the communication pipe 12. and a lid body 13b which is made into a unit.

Further, an orifice 14 is provided at the upper side of the tapered opening 11, specifically at a portion corresponding to the vicinity of the maximum liquid level of the main window 13.

According to the structure of the embodiment described above, when the feed pump P is driven, the fuel in the main chamber 3 is filtered by the filter 6 and fed to the fuel supply device 15 through the feed pipe 5, as shown in FIG.

In this fuel supply device 15, not all of the fuel fed from the feed pipe 5 is consumed, and excess fuel is returned into the tank body 1 via the return pipe 7.

Here, since the end of the return pipe 7 is formed as a nozzle 8 in the chamber 9 constituting the ejector part 13, the fuel is transferred from the nozzle 8 to the constricted part 10 and the tapered opening 11 by the discharge pressure of the feed pump P. It is ejected forcefully towards the target. Therefore, a negative pressure is generated around the nozzle 8 in the chamber 9, and this negative pressure causes the fuel in the auxiliary chamber 4 to be sucked into the chamber 9 through the communication pipe 12, and together with the jet from the nozzle 8. The flow rate is increased by the throttle part 10 and is fed into the main chamber 3 through the tapered opening 11, where an ejector action occurs, and the fuel in the sub-chamber 4 is returned to the main chamber 1 as excess fuel returns to the main chamber 3. Transferred within 3.

Here, the fuel injected from the nozzle 8 is swirled within the nozzle 8 by the swirling piece 100 as shown in FIG. The cone-shaped jet flow closes the tapered opening 11 side of the chamber 9. As a result, the negative pressure generated in the chamber 9 acts on the communication pipe 12 side without loss, and therefore the suction force of the fuel is substantially reduced compared to the case where fuel is injected spot-like from the nozzle 8. It is also possible to shorten the time required to suck up fuel from the assistant priest 4. Various ejector characteristics can be obtained by changing the shape of the rotating piece 100, such as by adding an inclination angle of the base portion 100a of the rotating piece 100 with respect to the wing portion 100b, or adding additional twist to the base portion 100a. tank capacity,
Easily adapts to differences in return flow rate, etc.

Once such a fuel transfer action occurs, even if the feed pump P is stopped, if the fuel level on the main chamber 3 side is lower than the fuel level on the auxiliary chamber 4 side, the communication pipe is removed from the chamber 9. Since the system 12 is full of fuel, the above-mentioned transfer of fuel is continued due to the siphon action 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, when the fuel level on the main chamber 3 side is higher than the fuel level on the auxiliary chamber 4 side, the tapered opening 11 of the chamber 9
Since the orifice 14 is located on the upper side, no siphon effect occurs, and therefore, there is no backflow of fuel from the main chamber 3 side to the auxiliary chamber 4 side. 16 in Figure 11 is Fuerudamba,
17 shows the heavy duty filter and 18 shows the pressure regulator.

In the embodiment shown in FIG. 10, one end opening 12a of the communication pipe 12 is placed in a swirling tank 19 fixed to the bottom wall of the auxiliary chamber 4. In the embodiment shown in FIG. By arranging the opening 12 & at one end of the communication pipe 12 in the turning tank 19 in this way, when the remaining fuel level becomes low, the fuel level will rise as shown by chain lines a and b in the same figure due to a sharp turn of the vehicle. Even if it is tilted, the rotating tank 1
The amount of fuel that can be sucked into the vehicle 9 can be secured, and the above-mentioned transfer of fuel from the auxiliary chamber 4 side to the main chamber 3 side can be continued even during this sharp turn.

In addition, when the feed pump P is arranged outside the tank body 1, the suction port of the feed pump P becomes the lower end of the feed pipe 5. Further, in the embodiment described above, the tapered opening 11 of the chamber 9 is submerged in the fuel in the main chamber 3, but if it is arranged above the fuel liquid level, there will be a hole in the upper side of the tapered opening 11 to prevent backflow. It is not necessary to provide the orifice 14.

Next, in the embodiments shown in FIGS. 12 to 17, a processed portion 101 is provided at the tip of each nozzle 8 as a diffusion device for ejecting fuel in a diffused state.

This processed part 101 may be one in which the front wall 8a at the tip of the nozzle 8 is provided with a spout 101a extending outward at an angle θ, as shown in FIG. It is possible to adopt a jet outlet 101a having a widening angle θ on the side wall 8b of the tip, but whichever method is adopted, the fuel can be diffused and injected, and therefore the tapered opening of the chamber 9 can be 11
The side is closed and the negative pressure generated in the chamber 9 can be applied to the communication pipe 12 side without loss.

The shape of the jet nozzle 101 & as seen from the tip of the nozzle 8 is as shown in FIGS. 14 to 16.
one divided into two nozzles 1ota by a partition/wall 101b, one divided into four nozzles 101a by a partition/wall 101b,
For some js, a jet nozzle 101a formed in a 0-shape can be adopted.

Further, as shown in FIG. 17, a screw-shaped spiral groove 101c may be formed in the inside diameter 9280 of the tip of the nozzle 8 so that the fuel is swirled within the nozzle 8 and ejected in a cone shape.

Further, the rotating piece serving as the diffusion device and the processing section may be used in combination.

As described in detail, according to the present invention, fuel in the main chamber is led out to the fuel supply device by driving the feed pump, and at the same time, fuel in the auxiliary chamber is transferred to the main chamber side by the ejector action of the ejector section. It can be transported smoothly, and since it does not require special electrical parts unlike conventional methods, it is structurally simple and has great practical effects, as it can significantly reduce costs. has.

Furthermore, since the nozzle protruding into the chamber is provided with a diffusion device, the fuel ejected from the nozzle diffuses and closes the lower side of the chamber below the nozzle, thereby preventing air from being sucked in from the tapered opening. Therefore, the negative pressure generated in the chamber can be applied to the communication pipe without loss, and the fuel in the auxiliary chamber can be efficiently transferred to the main chamber.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall sectional view, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, FIG. 3 is a perspective view of the turning piece, and FIGS. 8 and 9 are a plan view and a front view showing the flow of fuel, respectively. FIG. 10 is a partial sectional view of another embodiment, and FIG. Fig. 11 is a fuel supply system diagram, Figs. 12 to 17 show another embodiment, Figs. 12 and 13 are longitudinal sections of the nozzle tip, Figs. 14 to 16 are cross sectional views of the nozzle tip, and Figs.
FIG. 7 is a longitudinal sectional view of the nozzle tip. 1...Tank body, 2...Bulging part, 3...Main chamber,
4... Sub-chamber, 5... Feed pipe, 7... Return pipe, 8... Nozzle, 9... Chamber, 10
... Throttle part, 11... Tapered opening part, 12... Communication pipe, 13... Ejector part, 100... Rotating piece (diffusion device), 101... Processing part (diffusion bag ri
). Figure 1 Figure 2 Figure 3 Figure 5 00b

Claims (1)

[Claims] (1) In a structure in which a bulge is formed on the bottom wall of the tank body and a main chamber and a sub-chamber are separated from each other in substantially the lower half of the tank body, a feed pipe is connected near the bottom of the main chamber. A chamber is formed at the end of the return pipe that protrudes into the tank body, and a nozzle that protrudes into the chamber is formed at the end of the return pipe, and the fuel is diffused and ejected into the nozzle. A diffusion device is provided, and a constriction part is formed below the nozzle of the chamber, and a tapered opening is formed following the constriction part, and the tapered opening is arranged in the main chamber, while the opening at one end is arranged in the subchamber. A fuel suction device for a fuel tank, characterized in that a communication pipe disposed near the bottom is connected to the nozzle circumferential side of the chamber, and an ejector portion is configured at a connecting portion between the chamber and the communication pipe.