JPH0620683Y2 - Fuel inlet of fuel tank - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention, when sending fuel from a fuel tank to an engine,
The present invention relates to an improvement of a fuel suction port provided at a tip portion of a suction pipe in a fuel tank in order to prevent suction of flat dust or the like such as a label coming off.

[Conventional technology]

When suctioning fuel with the suction pipe, foreign substances such as labels floating in the fuel tank are sucked together with the fuel, and the device for preventing the suction pipe and the fuel pipe from being clogged up is conventionally the suction port of the suction pipe. The opening surface was not made flat by making holes in the vicinity or forming a claw shape (Actual No. 59-72122).

[Problems to be solved by the device]

However, the conventional fuel suction port device having such a structure has the following problems.

There is a risk of engine stall because the opening is blocked by a small amount of foreign matter such as dust and the suction ability is significantly reduced.

When a label or other large foreign matter comes into close contact, the opening is completely covered and the fuel cannot be sucked up.

It is difficult for foreign matter that comes into close contact with the opening to separate.

Most foreign matter smaller than the inner diameter of the suction pipe is sucked.

The suction pipe is clogged with foreign matter such as dust.

There is also an example in No. Sho 61-67235, where a suction pipe is provided with an extension pipe toward the bottom of the tank, and the lower end of the pipe has multiple suction ports. I can't depress enough.

[Means for Solving the Problems]

Therefore, as a result of studying the structure for preventing clogging due to various factors described above, the present invention has found that in the fuel intake port of the fuel tank in which the sub tank is provided at the tip of the suction pipe (4) in the fuel tank (6) At least the upper surface of the sub-tank is a main body casing (1) with a closed state, and a spiral wall is provided inside the main casing (1). Further, a fuel inlet of a fuel tank was developed, which is characterized in that a spiral wall (5) is provided with an inward projection or a notch (7) so as to remove foreign matter to the outside of the room. The fuel inlet main casing (1) referred to here includes not only the upper surface but also the lower surface having a lid. Also,
The spiral separation chamber (2) is a part surrounded by the spiral wall (5).

[Action]

Due to the structure of the fuel inlet of the fuel tank, even if foreign matter such as dust or labels is present in the tank and is sucked together with the fuel, the centrifugal separation action in the spiral separation chamber causes the foreign matter to remain on the spiral wall. Foreign matter is prevented from being sucked into the suction pipe by being collected on the outer wall portion or screened by a flow resistance, a difference in cross-sectional area in the system, or the like. Since a predetermined amount of fuel oil is always stored in the spiral separation chamber, the fuel sucking function is achieved even when the fuel tank vibrates and the fuel swells due to front and rear or left and right inclinations and the liquid level drops. Also,
It is also possible to prevent all of the openings from being blocked with a label or the like and lowering the suction ability.

〔Example〕

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

FIG. 1 is a perspective view of a fuel suction port according to the present invention. Second
FIG. 4 to FIG. 4 are cross-sectional views of a portion provided with a cutout portion. Fifth
FIGS. 7 to 7 are schematic cross-sectional views showing examples in which the cross section of the flow path is changed.

As shown in Fig. 1, this device is installed at the tip of the suction pipe (4) in the fuel tank (6), and the inside of the device main body casing (1) is formed by the spiral wall (5) in the spiral separation chamber.
It is (2). The spiral separation chamber (2) entrance opening (3)
The spiral separation chamber (2) ends at the center of the casing, and the lower end of the suction pipe (4) is arranged at that portion.

The flow passage cross-sectional area of the spiral separation chamber (2) is related to the flow velocity of the sucked fuel oil. Foreign matter sinks in the portion where the flow velocity is slow. Therefore, in the present invention, the flow passage cross-sectional area can be changed according to the purpose, and FIG. 5 shows a structure in which the cross-sectional area is gradually increased from the outer side to the inner side. On the contrary, the outer peripheral side has a large cross-sectional area.

Since the present apparatus is provided with a plurality of openings (3) at the inlet of the spiral separation chamber (2) at intervals, the flow velocity at the inlet of the spiral separation chamber (2) is slower than the internal flow velocity. Therefore, most of the foreign matter sinks at that portion and is difficult to enter inside. However, if a protrusion or a notch is provided toward the inside of the side wall of the spiral separation chamber, the flow velocity can be further changed, and the effect of collecting foreign matter can be increased. This is shown in FIGS. 2 to 4. These are those in which the spiral wall (5) is provided with a cutout (7) .Foreign matter mixed in the room moves inside the room along the side wall due to centrifugal force, and at that time, from the cutout (7) to the outside. Is discharged.

[Effect of device]

The following effects were obtained by using the above-described structure for the fuel suction port.

It is possible to prevent foreign matter from entering the fuel sucked from the suction pipe, which may cause deterioration of the engine function, and to always secure a sufficient opening for suction.

An example of the conventional product is shown in Fig. 9 (a) (b).
The air suction and the fuel suction function are reduced when the vehicle is tilted or inclined (b), but with the device of the present invention, as shown in FIGS. The fuel is always sucked up in a stable manner even on the slope (b).

Since it can be installed at the bottom of the fuel tank, the capacity of the tank can be substantially increased.

When the main body is made of resin, it has a seemingly complicated structure, but it can be integrally molded, and since it is compact, the process can be simplified and the cost can be reduced.

The excellent foreign matter selection effect prevents suction of foreign matter such as dust that would clog the suction pipe.

[Brief description of drawings]

FIG. 1 is a perspective view of a fuel suction port according to the present invention. Second
FIG. 4 to FIG. 4 are cross-sectional views of a portion provided with a cutout portion. Fifth
FIGS. 7 to 7 are schematic cross-sectional views showing examples in which the cross section of the flow path is changed. 8 (a) and 8 (b) are cross-sectional views of the product of the present invention and FIGS. 9 (a) and 9 (b), respectively, when the conventional product is used. (1) Main body casing, (2) Spiral separation chamber (3) Inlet opening, (4) Suction pipe (5) Spiral wall, (6) Fuel tank (7) Notch

Claims (1)

[Scope of utility model registration request] 1. A fuel inlet of a fuel tank, wherein a sub-tank is provided at the tip of a suction pipe (4) in the fuel tank (6), and the sub-tank is a main body casing (1) whose top surface is at least closed. A spiral wall is provided on the spiral wall, a plurality of spiral separation chamber (2) inlet openings formed by the spiral wall are spaced apart, and the spiral wall (5) is provided with an inward projection or notch (7). A fuel inlet of a fuel tank, characterized by being provided to remove foreign matter to the outside of the room.