JPH02155833A - Fuel suction device of fuel tank - Google Patents

Abstract

PURPOSE:To prevent generation of uncomfortable sound in the body of a tank by furnishing a silencer at the bottom opening of an ejector chamber, or by installing a selector valve at the divergent point of the exhaust hole and a return pipe or a gas/liquid separating chamber upstream the nozzle part of the return pipe. CONSTITUTION:When the fuel temp. in a return pipe 16 is high at the time of idling, bubbles in the fuel separate and clustered to become large, and pass through the nozzle part 17 of the pipe 16 while expanding abruptly, and these expanded bubbles are turned into particulates by a small hole 23 in a silencer 22. Thereby the sound due to each bubble becomes small, not giving uncomfort able sense to the passengers. Or otherwise, bubbles in the return pipe 16 are exhausted from an open exhaust hole 27 by switching a selector valve 28 to the exhaust hole 27 side, to hinder generation of foreign sound, and further a gas/liquid separating chamber is furnished upstream the nozzle part 17 of the return pipe 16, for exhausting the bubbles generated in the pipe 16 before reaching the nozzle part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a fuel suction device for a fuel tank mounted on a vehicle such as an automobile.

Conventional Technology For example, in the case of a fuel tank for automobiles, as shown in FIG. 7, due to the structure on which this fuel tank is mounted, the bottom wall of the tank body 1 is bulge part 2
In some tanks, a main chamber 3 and a sub-chamber 4 are separated from each other within the tank body 1.

When the main chamber 3 and the auxiliary chamber 4 are separated in this way, a 1f condition occurs in which fuel remains in either one of the compartments when the remaining amount of fuel is low, so that the main chamber 3 is not inserted into the main chamber 3. A nozzle +1<6 is formed at the tip of the return pipe 5, and an ejector chamber 7 is disposed around this nozzle portion 6. A communication pipe 8 extending from the auxiliary chamber 4 is connected to the ejector chamber 7. The fuel in the auxiliary chamber 4 is supplied to the main chamber 3 by being drawn into the recirculated fuel jet of the pipe 5 (Japanese Unexamined Patent Publication No. 62-68129, Utility Model Application No. 62-194125, Utility Model Application No. 62-182823) Publication No.).

Problems to be Solved by the Invention When the ignition key is turned off after the vehicle has been driven (immediately after a predetermined time), when the ignition key is turned on after the vehicle has been left for 10 to 20 minutes (immediately after the predetermined time), or During idling (for a predetermined period of time), etc., if the fuel temperature inside the various pipes, ties (1 return pipe 5) is high, the air bubbles inside the fuel will separate, converge and become larger, causing the nozzle part 6 of the return pipe 5 to suddenly There is a problem in that abnormal noise is generated due to the difference in pressure fluctuation when the tube passes through the tube while expanding.

However, as a countermeasure to this problem, it may be possible to cover the tank body 1 so that the noise is not transmitted to the outside, but this causes a problem in that the outer size of the tank becomes larger and the weight increases.

SUMMARY OF THE INVENTION Therefore, the present invention provides a fuel suction device for a fuel tank that prevents unpleasant noise from occurring within the tank body.

Means for Solving the Problem The tank body is divided into a main chamber and a sub-chamber, a return pipe faces the main chamber, a suction pipe is provided leading from the sub-chamber to the main chamber, and the return pipe described in I. In the fuel suction device for a fuel tank, a nozzle part is formed at the tip of the suction pipe, and an ejector chamber surrounding the nozzle part of the return pipe is formed at the end of the suction pipe on the main chamber side. A silencer is attached to the 1-1 opening at the end, or a discharge port is provided that branches off in the middle of the return pipe and opens into the 1mm room, and it is possible to switch between this discharge port and the branch of the return pipe. A switching valve is provided, and
A gas-liquid separation chamber is provided at a point downstream from the nozzle portion of the return pipe.

In the case where a Xylenzer is attached to the lower end opening of the working ejector chamber, the air bubbles that cause abnormal noise are broken up by a silencer, and in the case where a switching valve is installed in the middle of the return pipe, When air bubbles are generated, the switching valve is switched to the discharge 1 side to prevent the generation of abnormal noise.In addition, in the case where a gas-liquid separation chamber is provided in the 1st stream from the nozzle part of the return pipe, the air bubbles are removed from the return pipe. Once it reaches the nozzle part of the pipe, it is separated and processed.

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

FIG. 1 shows a vehicle fuel tank according to a first embodiment of the present invention.

A bulge 2 is formed in the center of the bottom wall of the tank body 1, and a main chamber 3 and a sub-chamber 4 are separated from each other within the tank body 1. Note that 9 indicates a filler dupe and 10 indicates a bent cove.

An in-tank type fuel pump 12 equipped with a suction filter 11 is buried in the main chamber 3, and a feed pipe 14 extending to the engine 3 outside the tank body 1 is attached to the fuel pump 12. . In addition, 15
indicates a pressure regulator.

Moreover, a return pipe 16 for returning surplus fuel of the fuel sent to the engine 13 by the feed pipe 14 to the main chamber 3 faces inside the main chamber 3.

A nozzle portion 17 is provided at the tip of the return pipe 16, and one side of the nozzle portion 17 has a relief valve I8.
is provided.

On the other hand, a suction pipe 19 extending to the outside of the tank body l and reaching the main chamber 3 faces the auxiliary chamber 4, and a nozzle portion 17 of the return pipe 16 is connected to the end of the suction pipe 19 on the main chamber 3 side. An ejector chamber 20 that surrounds and is constricted at the bottom is connected to the ejector chamber 20.

A silencer 22 is attached between the lower ends of this ejector chamber 20 [1 part 21 (located at a lower position that does not affect the nozzle part 17 of the return pipe I6).

The silencer 22 is a cylindrical member made of metal or resin and provided with a small hole 23, and has a double structure. In addition, as this silencer 22, the above-mentioned small hole 2
In addition to the type provided with 3, it is also possible to use a type mainly made of sponge, nonwoven fabric, metal mesh material, or the like.

Further, in the above-described configuration, the case where the return pipe 16 and the suction pipe 19 are integrated with the ejector chamber 20 has been explained, but normally, the return pipe 16 and the suction pipe 19 are connected to the ejector pump 24 equipped with the ejector chamber 20 as shown in FIG. pipe 1
6 connection boat 25, suction pipe I9 connection boat 26
The return pipe 16 and the suction pipe 19 are connected to each of the connection boats 25 and 26, and a silencer 22 is attached to the lower end opening 21 of the ejector chamber 20.

According to the structure of the above embodiment, the engine 1
3 is injected from the nozzle part 17 of the return pipe I6 into the ejector chamber 20, and passes through the lower end opening 21 of the ejector chamber 20.
Negative pressure is generated in the auxiliary chamber 4, so that the fuel in the auxiliary chamber 4 is sucked into the main chamber 3 by the suction pipe 19, and is sent to the main chamber 3 together with the recirculated fuel in the return pipe 16.

Therefore, the fuel in the auxiliary chamber 4 is effectively utilized without remaining.

For example, after driving the vehicle, turn the ignition key to 0.
If the temperature of the fuel in the return pipe 16 is high when the ignition key is turned ON after FFL, the vehicle has been running for 10 to 20 minutes, or is idling, air bubbles inside the fuel may separate and converge. The air bubbles increase in size and pass through the nozzle portion 17 of the return pipe 16 while expanding rapidly, but the air bubbles that expand and become larger are reduced to fine particles by the small holes 23 of the silencer 22.

Therefore, the sound produced by each bubble becomes extremely small.
It does not cause any discomfort to the passengers.

Further, the silencer 22 can extinguish the jet flow from the nozzle portion 17 of the return pipe 16 and the jet bed of the fuel sent from the auxiliary chamber 4 by the suction pipe 19.

In addition, if the back pressure increases more than necessary due to the nozzle mI 7 of the return pipe 16, the return pipe 1
The relief valve 18 provided upstream of the nozzle portion 17 of No. 6 opens, and the internal pressure of the return pipe I6 can be lowered.

Since the silencer 22 is located at a position where it does not affect the nozzle portion 17 of the return pipe 16, it does not reduce the fuel transfer efficiency of the suction pipe 19.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 5.

This embodiment uses the silencer 22 in the previously described embodiment.
A discharge port 27 is provided upstream of the relief valve +8 provided in the nozzle portion I7 of the return pipe 16, and a switching valve 28 is provided at the branch point between the discharge port 27 and the return pipe 16.

The discharge port 27 has a straight open end (as long as it is not constricted), and the switching valve 28 is switched into the return pipe 16 (see Fig. 5) to the discharge port 27 side. When the state is switched to the state (see FIG. 4), the return pipe 16 is opened into the main chamber 3 without going through the ejector chamber 20.

The switching valve 28 is a solenoid type valve, and is connected to an ignition switch 30 via a control unit 29.

The control unit 29 controls when the ignition switch 30 is turned off (immediately after one minute) after the vehicle is running.
When the ignition switch 30 is turned on after the vehicle has been left for 10 to 20 minutes after running (1 minute immediately after) or when idling (about 1 minute), the switching valve 28 is
Otherwise, it is switched to the nozzle part 17 side (I (direction position) shown in FIG. 5).In other words, the air bubbles in the return pipe 16 are As the temperature increases, the nozzle: π<1
7, the switching valve 28 is switched to the A direction position when the vehicle is placed in a situation where an abnormal noise is generated when the vehicle exits the vehicle.

Therefore, in the case mentioned above, the discharge 1127 is opened.
Since air bubbles are discharged from the air bubbles, the generation of abnormal noise can be prevented.

It should be noted that the other configurations and operations are the same as those of the first embodiment, so the same parts are given the same reference numerals and the explanation will be omitted.

Next, a third embodiment of the present invention is shown in FIG.

The basic overall configuration of this embodiment is the same as that of the first embodiment, so only the main parts will be explained here with reference to FIG. 6.

That is, in this embodiment, a gas-liquid separation chamber 3I is provided upstream of the nozzle portion 17 of the return pipe I6 in the first embodiment.

-1- Specifically, the gas-liquid separation chamber 31 has a nozzle section 17 at the bottom which is inserted into the ejector chamber 20, and a return pipe 16 is inserted into the section. A gate valve 32 is provided in the insertion portion, and a vapor vent hole 33 is provided adjacent to the gate valve 32. When a certain amount of vapor remains in the vapor vent hole 33, the valve body resists a spring 34 and closes. A vapor vent valve 36 is provided which pushes up the vapor vent valve 35 and opens the vapor vent hole 33.

Note that a suction pipe 19 is connected to the ejector chamber 20.

Therefore, in this embodiment, the return pipe I
On the way to the nozzle part 17 of the return pipe 16, the bubbles generated at 6 and pushed downward are guided by the gate valve 32 in the gas-liquid separation chamber 31, and are discharged to the lower side of the vapor vent valve 36 in the vapor vent hole 33. The vapor is discharged by pushing the vapor release valve 36 against the spring 34.

Therefore, when the fuel temperature rises and air bubbles are generated in the return pipe 16, the air bubbles reach the nozzle part 17 of the return pipe I6 and are discharged from the constricted part of the nozzle part 17. This prevents the generation of abnormal noises that occur during inflation and does not cause discomfort to the occupants.

Note that the recirculated fuel supplied from the return pipe 16 to the gas-liquid separation chamber 3I is jetted from the nozzle part I7 of the gas-liquid separation chamber 31 to the ejector chamber 20, resulting in negative pressure in the ejector chamber 20, which causes the suction pipe to The presence of the gas-liquid separation chamber 31 does not affect the function of guiding the fuel in the auxiliary chamber to the main chamber via the gas-liquid separation chamber 31, and the efficiency of transferring fuel within the suction pipe I9 does not decrease.

Effects of the Invention As described above, according to the invention set forth in claim 1, the silencer is used to reduce the size of bubbles that cause abnormal noise, thereby affecting the efficiency of fuel transfer through the suction pipe. This has the effect of significantly reducing noise caused by air bubbles, which can cause discomfort to passengers.

Further, according to the invention as set forth in claim 2, air bubbles can be discharged from "1" before reaching the nozzle portion of the return pipe, and there is an effect that generation of abnormal noise can be prevented.

According to the third aspect of the invention, the air bubbles can be separated and discharged by the gas-liquid separation chamber before reaching the nozzle part, so that unpleasant noises are generated when the air bubbles are pushed out from the nozzle part, as described above. This has the effect of being able to prevent this from happening.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view of the first embodiment of the present invention, Fig. 2 is a side view of the main part of Fig. 1, Fig. 3 is an overall sectional view of the second embodiment, and Figs. FIG. 3 is an explanatory diagram of the switching state of the switching valve, FIG. 6 is a sectional view of the main part of the third embodiment, and FIG. 7 is an overall sectional view of the prior art. 1...Tank body, 3...Main chamber, 4...Sub-chamber, 16
・Return pipe, 17... Nozzle part, 19... Suction pipe, 20... Ejector chamber, 21... Lower end opening, 22... Silencer, 27... Discharge port, 28...
-Switching valve, 31...gas-liquid separation chamber.

Claims (3)

[Claims] (1) The tank body is divided into a main chamber and an auxiliary chamber, a return pipe faces the main chamber, a suction pipe is provided leading from the auxiliary chamber to the main chamber, and a nozzle is installed at the tip of the return pipe. is formed, and an ejector chamber surrounding the nozzle portion of the return pipe is formed at the end of the suction pipe on the main chamber side.A silencer is attached to the lower end opening of the ejector chamber. A fuel suction device for a fuel tank, characterized in that: (2) The tank body is divided into a main chamber and an auxiliary chamber, a return pipe faces the main chamber, a suction pipe is provided leading from the auxiliary chamber to the main chamber, and a nozzle is installed at the tip of the return pipe. In a fuel suction device for a fuel tank, in which an ejector chamber is formed at the end of the main chamber side of the suction pipe to surround the nozzle part of the return pipe, the return pipe branches into the return pipe midway. A fuel suction device for a fuel tank, characterized in that a discharge port is provided that opens into a main chamber, and a switching valve that can switch between the discharge port and a return pipe is provided at a branch part of the discharge port and a return pipe. (3) The tank body is divided into a main chamber and an auxiliary chamber, a return pipe faces the main chamber, a suction pipe is provided leading from the auxiliary chamber to the main chamber, and a nozzle is installed at the tip of the return pipe. In a fuel suction device for a fuel tank, in which an ejector chamber surrounding a nozzle portion of the return pipe is formed at the end of the main chamber side of the suction pipe, a gas-liquid separation is performed upstream of the nozzle portion of the return pipe. A fuel suction device for a fuel tank, characterized in that a chamber is provided.