JP2009002161A - Fuel supply device for svo fuel vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device capable of stably supplying vegetable oil. <P>SOLUTION: The fuel supply device (10) for a SVO (Straight Vegetable Oil) fuel vehicle is equipped with a SVO fuel reservoir (22) for storing SVO fuel, a SVO fuel supply pipe (24) for supplying SVO fuel to an engine and a SVO fuel heating means (40) for heating the SVO fuel. The SVO fuel heating means is extended to the SVO fuel supply pipe from a radiator so as to heat the SVO fuel supply pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention generally relates to vehicle fuel supply devices. More specifically, the present invention relates to a fuel supply device for an SVO fuel vehicle that uses SVO fuel.

The expansion of the automobile society has increased CO ₂ emissions, which contributes to global warming. Therefore, the idea of controlling the total amount of CO _{2 on} the ground by running a vehicle with plant-based fuel without using fossil fuels such as oil has attracted attention. Biodiesel (BDF) fuel using edible oil as a raw material is known as a plant fuel used in such a case. BDF fuel has the advantage of low CO ₂ concentration in the exhaust gas and contains almost no SO _X , but requires a catalyst during purification and increases costs, and also treats by-products and sewage during purification. Has the disadvantage of having to.

  On the other hand, straight vegetable oil (SVO) fuel that uses vegetable oil (including waste cooking oil) as it is without refining has attracted attention.

  SVO fuel has various advantages as a vehicle fuel. However, since the fluidity of the SVO fuel decreases as the temperature decreases, the fuel supply may become unstable when the vehicle is mounted with a vegetable oil tank. In addition, SVO fuel itself is not subject to taxation, but if SVO fuel is mixed with mineral oil (light oil, gasoline, etc.), all oil types (including SVO fuel) are subject to taxation, and the engine starts smoothly. There is also a risk that this may not happen.

  The present invention has been devised in view of such a situation, and an object thereof is to provide a fuel supply device for an SVO fuel vehicle that can stably supply vegetable oil. Another object of the present invention is to provide a fuel supply device for an SVO fuel vehicle that can be started and operated without mixing the hydrocarbon fuel and the SVO fuel.

  A fuel supply device for an SVO fuel vehicle according to claim 1 of the present application includes an SVO fuel storage tank for storing SVO fuel, an SVO fuel supply pipe for supplying SVO fuel to an engine, and a heater for heating SVO fuel. SVO fuel heating means, and the SVO fuel heating means is configured to extend from the radiator of the engine to the SVO fuel supply pipe to heat the SVO fuel supply pipe. Is.

  The fuel supply device for an SVO fuel vehicle according to claim 2 of the present application is characterized in that, in the device of claim 1, the hot water tube extends to the inside of the SVO fuel storage tank.

  A fuel supply device for an SVO fuel vehicle according to claim 3 of the present application is the device according to claim 1 or 2, wherein a hydrocarbon fuel storage tank for storing hydrocarbon fuel and a hydrocarbon fuel to the engine are supplied. A hydrocarbon fuel supply pipe, an oil circulation pipe, a hydrocarbon fuel return pipe branched from the oil circulation pipe to the hydrocarbon fuel storage tank, and a branch branched from the oil circulation pipe to the SVO fuel storage tank An SVO fuel return pipe, and a check valve disposed in the hydrocarbon fuel supply pipe, the hydrocarbon fuel supply pipe, the SVO fuel supply pipe, the oil circulation pipe, the hydrocarbon fuel return pipe, and Each of the SVO fuel return pipes is provided with a shut-off valve. By opening and closing each shut-off valve, the hydrocarbon fuel is not mixed into the SVO fuel storage tank while the hydrocarbon fuel is mixed into the engine. Supplying, or is characterized in that it is configured such that the SVO fuel into the hydrocarbon fuel oil storage tank can be supplied to the SVO fuel to an engine with no contamination.

  The fuel supply device for an SVO fuel vehicle according to claim 4 of the present application further includes an air chamber for air separation disposed in the oil circulation pipe in the device of claim 3, and the carbonization during operation with hydrocarbon fuel. When the shutoff valve of the hydrogen fuel return pipe is closed, air enters the hydrocarbon fuel supply pipe, or when the shutoff valve of the SVO fuel return pipe is closed during operation with SVO fuel, the SVO fuel supply pipe When air is mixed in, the air chamber is configured to temporarily store air.

  A fuel supply device for an SVO fuel vehicle according to claim 4 of the present application is characterized in that, in the device according to any one of claims 1 to 3, the SVO fuel is vegetable oil.

  According to the apparatus of the present invention, it is possible to stably supply SVO fuel even when the temperature is lowered. In addition, according to the apparatus of the present invention, since mixing of hydrocarbon fuel and SVO fuel can be avoided, it is possible to start the engine smoothly without any tax disadvantage.

  Next, a fuel supply device for an SVO fuel vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall view schematically showing a fuel supply device for an SVO fuel vehicle according to a preferred embodiment of the present invention. A fuel supply device for an SVO fuel vehicle according to a preferred embodiment of the present invention, generally indicated by reference numeral 10 in FIG. 1, supplies light oil to a diesel oil storage tank 12 and diesel engine 14 for storing diesel oil. A light oil supply pipe 16 extending from the light oil storage tank 12 to the diesel engine 14 is provided. The light oil supply pipe 16 is provided with a light oil supply pipe cutoff valve 16a for shutting off the supply of light oil.

  The light oil supply pipe 16 is provided with a fuel injection pump 18 for sending fuel to a fuel injection nozzle (not shown) of the diesel engine 14. In FIG. 1, the booster pump 20 is disposed adjacent to the fuel injection pump 18, but the booster pump 20 is not an essential device and may not be installed.

  The fuel supply device 10 for the SVO fuel vehicle also has a vegetable oil storage tank 22 for storing the vegetable oil, and a vegetable oil supply pipe 24 that joins the light oil supply pipe 16 from the vegetable oil storage tank 22 to supply the vegetable oil to the diesel engine 14. The vegetable oil supply pipe 24 is provided with a vegetable oil supply pipe cutoff valve 24a for blocking the supply of vegetable oil.

  Further, the vegetable oil supply pipe 24 is provided with a heater 26 for heating the vegetable oil and an element 28 for filtering unnecessary substances contained in the vegetable oil.

  The fuel supply device 10 for the SVO fuel vehicle also extends from the air chamber 30 for air separation, the outlet of the air chamber 30, joins the light oil supply pipe 16, and extends from the discharge ports of the fuel injection pump 18 and the booster pump 20. An oil circulation pipe 32 reaching the inlet of the air chamber 30 is provided, and an oil circulation pipe cutoff valve 32 a is arranged in the oil circulation pipe 32. As will be described in detail later, the air chamber 30 serves to prevent air bubbles from moving to the fuel pump by temporarily separating and storing air.

  The fuel supply device 10 for an SVO fuel vehicle also includes a light oil return pipe 36 branched from the oil circulation pipe 32 to the light oil storage tank 12, and a vegetable oil return pipe 38 branched from the oil circulation pipe 32 to the vegetable oil storage tank 22. The light oil return pipe 36 is provided with a light oil return pipe cutoff valve 36a, and the vegetable oil return pipe 38 is provided with a vegetable oil return pipe cutoff valve 38a.

  The fuel supply device 10 for an SVO fuel vehicle is also provided with a vegetable oil heating means 40 for heating the vegetable oil supply pipe 24 using hot water from a radiator (not shown) of the diesel engine 14. The vegetable oil heating means 40 is formed as a hot water tube that extends from the radiator to the vegetable oil supply pipe 24 and is bound together with the vegetable oil supply pipe 24 and is bundled together with the vegetable oil return pipe 38 and returns to the radiator again. (See FIG. 3).

  Preferably, the vegetable oil itself may be heated by extending the hot water tube of the vegetable oil heating means 40 to the inside of the vegetable oil storage tank 22. In the example shown in FIG. 2, the hot water tube is formed in a loop shape inside the vegetable oil storage tank 22, but the hot water tube may be formed in an arbitrary shape (for example, a coil shape) inside the vegetable oil storage tank 22. Good. In the above-described embodiment, the vegetable oil heating means 40 is formed as a hot water tube. For example, the vegetable oil supply pipe 24 and the vegetable oil return pipe 38 have a double pipe structure, and hot water from the radiator is supplied to the outer pipe. By supplying, the vegetable oil supply pipe 24 and the vegetable oil return pipe 38 may be heated.

  The SVO fuel vehicle fuel supply device 10 further includes a check valve 42 disposed in the light oil supply pipe 16. By providing the check valve 42, it is possible to prevent vegetable oil from being mixed into the light oil storage tank 12.

  Next, with reference to FIGS. 4 and 5, the operation of the fuel supply device 10 for an SVO fuel vehicle configured as described above will be described. First, when starting operation with only light oil as usual, the light oil supply pipe cutoff valve 16a and the light oil return pipe cutoff valve 36a are opened, the vegetable oil supply pipe cutoff valve 24a, the oil circulation pipe cutoff valve 32a, and the vegetable oil are opened. The return pipe shut-off valve 38a is closed (see FIG. 4 (a)). 4A, light oil is supplied to the fuel pump via the light oil supply pipe 16 during start-up and operation, and the light oil hot water storage tank 12 is connected via the light oil return pipe 36 during the air bleeding operation. The light oil is returned to

  When attempting to operate with light oil, the light oil supply pipe shutoff valve 16a and the light oil return pipe shutoff valve 36a are opened as described above, but the light oil return pipe shutoff valve 36a is closed and the light oil supply pipe shutoff valve 16a and the oil circulation are closed. When the light shutoff valve 32a is opened and the light oil is circulated, the light oil return pipe disappears. Therefore, if air enters the light oil supply pipe 16, the bubbles may move to the fuel pump and the light oil may not be supplied to the engine. is there. Therefore, by providing the air chamber 30, air is temporarily separated and stored, and movement of bubbles to the fuel pump is avoided. When air is mixed in the light oil supply pipe 16, the air is discharged into the light oil storage tank 12 through the light oil return pipe 36 when the light oil return pipe cutoff valve 36 a is opened.

  When trying to operate with vegetable oil, the vegetable oil supply pipe cutoff valve 24a and the vegetable oil return pipe cutoff valve 38a are opened, and the light oil supply pipe cutoff valve 16a, the oil circulation pipe cutoff valve 32a, and the light oil return pipe cutoff valve 36a are closed. (See FIG. 4 (b)). Then, as shown by an arrow in FIG. 4B, the vegetable oil is supplied to the fuel pump via the vegetable oil supply pipe 24 during operation, and the vegetable oil is returned to the vegetable oil hot water tank 22 via the vegetable oil return pipe 38 during air bleeding. It is.

  When trying to operate with vegetable oil, as described above, the vegetable oil supply pipe cutoff valve 24a and the vegetable oil return pipe cutoff valve 38a are opened, but the vegetable oil return pipe cutoff valve 38a is closed, and the vegetable oil supply pipe cutoff valve 24a and the oil circulation are closed. When the vegetable oil is circulated by opening the pipe shutoff valve 32a, the return pipe of the vegetable oil disappears. Therefore, if air enters the vegetable oil supply pipe 24, the bubbles may move to the fuel pump and the vegetable oil may not be supplied to the engine. is there. Therefore, by providing the air chamber 30, air is temporarily separated and stored, and movement of bubbles to the fuel pump is avoided. When air is mixed in the vegetable oil supply pipe 24, the air is exhausted to the vegetable oil storage tank 22 through the vegetable oil return pipe 38 when the vegetable oil return pipe shut-off valve 38a is opened.

  When replacing the inside of the fuel pump (the fuel injection pump 18 and the booster fuel pump 20) with vegetable oil from light oil, the light oil supply pipe cutoff valve 16a and the oil circulation pipe cutoff valve 32a are opened, and the vegetable oil supply pipe cutoff valve 24a is opened. When the gas oil return pipe shutoff valve 36a and the vegetable oil return pipe shutoff valve 38a are closed (see FIG. 5A), the fuel pump is replaced with light oil over time.

  In order to switch the inside of the fuel pump from light oil to vegetable oil, the vegetable oil supply pipe cutoff valve 24a and the oil circulation pipe cutoff valve 32a are opened, and the light oil supply pipe cutoff valve 16a, the light oil return pipe cutoff valve 36a, and the vegetable oil return pipe are opened. After operating with the shut-off valve 38a closed (see FIG. 5B) and waiting for the light oil in the fuel pump to be consumed, the oil circulation pipe shut-off valve 32a is closed and the vegetable oil return pipe shut-off valve 38a is opened. Open.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.

  For example, in the above embodiment, the fuel supply device is described in relation to a diesel engine, but the fuel supply device of the present invention can be applied to other types of engines (for example, gasoline engines).

  In the above embodiment, the fuel oil supply apparatus according to the present invention is described for the hydrocarbon fuel other than the light oil and the fuel other than the hydrocarbon fuel (including the BDF fuel). Can be applied.

1 is an overall view schematically showing a fuel supply device for an SVO fuel vehicle according to a preferred embodiment of the present invention. It is the enlarged view which showed the vegetable oil storage tank vicinity of FIG. FIG. 3 is an enlarged view of a portion 3 in FIG. 2. It is a figure for demonstrating the operating state of the fuel supply apparatus of FIG. It is another figure for demonstrating the operating state of the fuel supply apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel supply apparatus for SVO fuel vehicles 12 Light oil storage tank 14 Diesel engine 16 Light oil supply pipe 16a Light oil supply pipe cutoff valve 18 Fuel injection pump 20 Booster pump 22 Vegetable oil storage tank 24 Vegetable oil supply pipe 24a Vegetable oil supply pipe cutoff valve 26 Heater 28 Element 30 Air chamber 32 Oil circulation pipe 32a Oil circulation pipe shutoff valve 36 Light oil return pipe 36a Light oil return pipe shutoff valve 38 Vegetable oil return pipe 38a Vegetable oil return pipe shutoff valve 40 Vegetable oil heating means (hot water tube)
42 Check valve

Claims (5)

A fuel supply device for an SVO fuel vehicle,
An SVO fuel reservoir for storing SVO fuel;
An SVO fuel supply pipe for supplying SVO fuel to the engine;
SVO fuel heating means for heating the SVO fuel,
The apparatus, wherein the SVO fuel heating means is configured to extend from a radiator of the engine to the SVO fuel supply pipe to heat the SVO fuel supply pipe. The apparatus according to claim 1, wherein the hot water tube extends to the inside of the SVO fuel storage tank. A hydrocarbon fuel storage tank for storing hydrocarbon fuel;
A hydrocarbon fuel supply pipe for supplying hydrocarbon fuel to the engine;
An oil circulation pipe,
A hydrocarbon fuel return pipe branched from the oil circulation pipe to the hydrocarbon fuel storage tank;
A SVO fuel return pipe branched from the oil circulation pipe to the SVO fuel storage tank;
A check valve disposed in the hydrocarbon fuel supply pipe,
The hydrocarbon fuel supply pipe, the SVO fuel supply pipe, the oil circulation pipe, the hydrocarbon fuel return pipe, and the SVO fuel return pipe are each provided with a shut-off valve,
By opening and closing each shut-off valve, the hydrocarbon fuel is supplied to the engine in a state where the hydrocarbon fuel is not mixed into the SVO fuel storage tank, or the SVO fuel is supplied to the hydrocarbon fuel storage tank. The apparatus according to claim 1, wherein the SVO fuel can be supplied to the engine without being mixed. An air chamber for air separation disposed in the oil circulation pipe;
When the hydrocarbon fuel return pipe shut-off valve is closed during operation with hydrocarbon fuel, when air enters the hydrocarbon fuel supply pipe, or during operation with SVO fuel, the SVO fuel return pipe shut-off valve is closed. The apparatus according to claim 3, wherein when the air is mixed into the SVO fuel supply pipe, the air is temporarily stored in the air chamber. The apparatus according to any one of claims 1 to 4, wherein the SVO fuel is vegetable oil.

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