JP2004019565A - Engine fuel supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine fuel supply which is used for the drive source of a power generating device mainly employed for a frozen cargo delivery device mounted on a traction engine head, capable of preventing a engine unfavorable condition or failure by continuing a fuel supply into the engine when the fuel supply is temporarily stopped owing to fuel tank tilting caused by rolling or pitching in the time of transportation. <P>SOLUTION: The engine fuel supply comprises an auxiliary fuel tank 5 arranged at a higher location between a diesel engine 2 and a main fuel tank 4 than that between of the diesel engine 2 and the main fuel tank 5, a fuel pump 11 arranged on the passage of a primary feeding-passage 9 which supplies fuel G in the main fuel tank 4 into the auxiliary tank 5, a return pipe 12 returning the fuel G into the main fuel tank 4 by overflowing the fuel G when the level of the fuel G in the auxiliary fuel tank 5 exceeds a predetermined level, and a second feeding-passage 13 supplying the fuel G in the auxiliary fuel tank 5 into the diesel engine 2 by the power of self weight. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power generator for supplying frozen cargo mainly mounted on a tractor head, and more particularly, to a fuel supply apparatus for an engine used as a drive source of a power generator, in which a fuel tank is inclined by rolling or pitching during transportation. TECHNICAL FIELD The present invention relates to a technique for continuing fuel supply to an engine even when fuel supply is temporarily stopped, thereby preventing engine malfunction and engine stall.
[0002]
[Prior art]
Conventionally, a tractor head for towing and transporting a trailer for freezing or refrigeration or a refrigerated container mounted on the trailer while maintaining the temperature at a constant temperature is provided with a power generating device for supplying power to the refrigerated device. An internal combustion engine such as a diesel engine is generally used as a drive source.
Meanwhile, when these frozen cargoes are towed by the tractor head, the level of the fuel level in the fuel tank changes due to rolling and pitching caused by the suspension of the tractor head. At this time, if the inclination of the fuel tank is significant or the fuel level is low, the air in the fuel tank enters the supply path that supplies fuel to the engine, and the fuel supply is temporarily stopped. There has been a problem that the engine may stop working in the worst case.
In particular, since the power generator is mounted between the tractor head and the trailer, there is absolutely a limit on the space, and in order to assemble and mount the device efficiently, the fuel tank, which can be formed into any shape, is thinned and the engine It is required to be compact by assembling it and a generator. Therefore, the thinner the fuel tank, the easier it is for air to enter the supply passage due to a slight change in the level of the liquid level, and the possibility of engine malfunction or engine stall has become more pronounced.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to solve these conventional problems, and to provide a fuel supply device for an engine mainly used as a drive source of a power generation device for supplying frozen cargo mounted on a tractor head. An object of the present invention is to provide a fuel supply device for an engine which continues to supply fuel to the engine even if the fuel supply is temporarily stopped due to the inclination of the fuel tank due to rolling or pitching at the time, thereby preventing engine malfunction or engine stall.
[0004]
[Means for Solving the Problems]
The configuration of the present invention that has solved such a problem includes:
1) An auxiliary fuel tank is provided between the engine and the main fuel tank at a position higher than the engine and the main fuel tank, and a first supply path for supplying fuel in the main fuel tank to the auxiliary fuel tank is provided. A fuel pump for feeding fuel to the auxiliary fuel tank is provided in the middle of the auxiliary fuel tank, and when the liquid level of the fuel in the auxiliary fuel tank exceeds a predetermined height, a return path for overflowing the fuel and returning the fuel to the main fuel tank is provided. A second supply path for supplying the fuel to the engine by its own weight is provided, and even if the main fuel tank is inclined and the fuel supply via the first supply path is temporarily stopped, the fuel supply can be continued with the auxiliary fuel tank. Fuel supply device for engine 2) The fuel is supplied to the auxiliary fuel tank such that the flow rate of fuel in the first supply path is larger than the flow rate of fuel in the second supply path, and the fuel in the auxiliary fuel tank is supplied. But 3) The fuel supply device for an engine according to 1) above, wherein an upper portion of the main fuel tank is protruded upward to form an air chamber, and an end of a return path is communicated with the air chamber to form a main fuel tank. The fuel supply device for an engine according to the above 1) or 2), wherein the pressure in the tank and the auxiliary fuel tank are made the same so that the fuel can be circulated smoothly. 4) The start end of the second supply path is provided at the bottom of the auxiliary fuel tank. The fuel supply device for an engine according to any one of the above 1) to 3) 5) that is connected to the power supply device 6 that operates a generator with an engine fueled by the fuel supply device for an engine according to any one of the above 1) to 4). ) The power generator according to the above 5) is installed at the rear of the tractor head to which a trailer equipped with a refrigerated trailer or a refrigerated container is connected, and the trailer or the refrigerated refrigerator is installed. There electric power generated in the temperature controlled device antenna to tracks can be supplied.
[0005]
[Action]
According to the present invention, when the fuel pump is operated, the fuel in the main fuel tank is sent out through the first supply path, and the fuel is stored in the auxiliary fuel tank. Is exceeded, the fuel is overflowed and returned to the main fuel tank on the return path. By repeating this, the remaining fuel in the auxiliary fuel tank is circulated while maintaining a constant liquid level. Fuel is supplied to the engine by its own weight in the second supply path.
Therefore, even if the main fuel tank is inclined and air in the main fuel tank enters the first supply path, the air is released into the space above the fuel level in the auxiliary fuel tank, so that the air is discharged to the second supply path. With no fuel, only fuel is continuously supplied to the engine without any intrusion of air, and there is no malfunction or engine stall in engine rotation.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The upper part of the main fuel tank of the present invention is partially extended upward to form an air chamber, and when the end of the return path is communicated with the air chamber, the air pressure in the main fuel tank and the auxiliary fuel tank are kept the same. This is preferable because the fuel can be smoothly circulated.
The auxiliary fuel tank has a capacity of about 1 liter, which is sufficient. The auxiliary fuel tank is provided at a position higher than the main fuel tank and the engine so that the overflowed fuel is returned and the fuel is supplied to the engine by its own weight (head pressure).
The fuel supply device for an engine of the present invention can be preferably applied to a drive source of a power generator for supplying frozen cargo mainly mounted on a tractor head, but is also useful as a drive source of a device having an inclination such as a mower or a sprayer. It is.
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0007]
【Example】
The embodiment shown in FIGS. 1 to 7 is an example in which a power generation device to which the present invention is applied is mounted behind a tractor head that pulls a semi-trailer for freezing and refrigeration.
FIG. 1 is a schematic diagram of a power generator according to an embodiment.
FIG. 2 is an explanatory diagram of the power generator according to the embodiment.
FIG. 3 is a bottom view of the auxiliary fuel tank of the embodiment.
FIG. 4 is a sectional view taken along line AA of FIG.
FIG. 5 is a sectional view taken along line BB of FIG.
FIG. 6 is an explanatory diagram illustrating a state in which the power generation device according to the embodiment is mounted on a tractor head.
FIG. 7 is a schematic diagram illustrating a tilted state of the power generation device of the example.
[0008]
In the drawing, 1 is a power generator, 2 is a diesel engine, 2a is an anti-vibration rubber for absorbing impact, 3 is a generator, 3a is an anti-vibration rubber for absorbing impact, 3b is a power cable, 4 is a main fuel tank, 4a Is an air chamber, 4b is a filler port, 5 is an auxiliary fuel tank, 6 is a radiator, 7 is an air cleaner, 8 is a frame, 8a is a lower bed, 9 is a first supply path, 10 is a fuel filter, and 11 is a fuel pump. , 12 is a return path, 13 is a second supply path, 14 is a second return path for returning excess fuel from a fuel injection pump (not shown), 15 is a tractor head, 16 is a semi-trailer for freezing and refrigeration, and G is fuel.
[0009]
In this embodiment, as shown in FIG. 2, a lower bet 8a is attached to both sides of a thin main fuel tank 4 having a capacity of 80 liters for protection, and a frame 8 is installed on the lower bet 8a. The generator 1 is constructed by attaching the diesel engine 2, the generator 3 and other auxiliary devices via vibration isolating rubbers 2a and 3a to the generator 1, which is mounted on the rear part of the tractor head 15 and connected as shown in FIG. The power cable 3b is connected to a freezing / refrigeration apparatus (not shown) of the freezing / refrigeration semitrailer 16 that has been used.
The auxiliary fuel tank 5 has a size of about 10 cm square and has a capacity of 1 liter. As shown in FIGS. 3 to 5, four holes are drilled in the bottom surface, and the first supply passage 9 and the second supply passage 13 communicate with each other near the bottom surface. At the same time, the return path 12 and the second return path 14 communicate with the internal space near the upper surface, and are mounted on the frame 8 higher than the diesel engine 2 and the main fuel tank 4.
[0010]
In this embodiment, as shown in FIG. 1, after the fuel G is supplied into the main fuel tank 4, when the fuel pump 11 is operated, the fuel G in the main fuel tank 4 is sent out through the first supply path 9, and the auxiliary fuel is supplied. Fuel G is stored in the tank 5.
When the liquid level of the fuel G reaches a height exceeding the start end of the return path 12, the fuel G overflows and is returned to the main fuel tank 4 by its own weight on the return path 12, and the fuel G in the auxiliary fuel tank 5 is repeated by repeating this. The remainder is circulated while maintaining a constant liquid level.
The flow rates Q ₁ , Q ₂ , and Q ₃ of each fuel G shown in FIG. 1 can be obtained by sending the fuel G in an amount exceeding the maximum consumption required by the diesel engine 2 to the auxiliary fuel tank 5, so that Q ₃ = Q ₁ − to an amount which satisfies the formula Q _2.
The fuel G stored in the auxiliary fuel tank 5 is supplied to the diesel engine 2 through the second supply path 13 at a head pressure, and the diesel engine 2 operates to cause the output shaft (not shown) to rotate the generator 3 to generate power. , Electric power is transmitted to the semi-trailer 16 for freezing and refrigeration.
[0011]
Here, due to the swing of the tractor head 15 during traveling or the inclination of the road surface or the swing of the ship during sea transportation, the liquid level of the fuel G in the main fuel tank 4 is reduced to the first supply path 9 as shown in FIG. May move away from the beginning of the At this time, since the fuel pump 11 is operating, the air in the main fuel tank 4 is sucked and sent to the auxiliary fuel tank 5.
However, since the air is released into the space above the liquid level of the fuel G in the auxiliary fuel tank 5, no air enters the second supply path 13 at all. Therefore, only the fuel G is supplied to the diesel engine 2 in the second supply path 13, and the generator 3 is operated stably without causing any malfunction or engine stall in the rotation of the engine 2 to continuously supply electric power. it can.
[0012]
【The invention's effect】
As described above, according to the present invention, even if fuel supply is temporarily stopped due to the inclination of the fuel tank due to rolling or pitching during transportation, fuel supply to the engine is continued to prevent engine malfunction and engine stall. An engine fuel supply device can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a power generator according to an embodiment.
FIG. 2 is an explanatory diagram of a power generator according to an embodiment.
FIG. 3 is a bottom view of the auxiliary fuel tank of the embodiment.
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is a sectional view taken along line BB of FIG. 3;
FIG. 6 is an explanatory diagram showing a state in which the power generator of the embodiment is mounted on a tractor head.
FIG. 7 is a schematic diagram illustrating a tilted state of the power generator according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power generator 2 Diesel engine 2a Anti-vibration rubber 3 Generator 3a Anti-vibration rubber 3b Power cable 4 Main fuel tank 4a Air chamber 4b Filler port 5 Auxiliary fuel tank 6 Radiator 7 Air cleaner 8 Frame 8a Lower bet 9 First supply path Reference Signs List 10 fuel filter 11 fuel pump 12 return path 13 second supply path 14 second return path 15 tractor head 16 semi-trailer G for freezing and refrigeration Fuel

Claims (6)

An auxiliary fuel tank is provided between the engine and the main fuel tank at a position higher than the engine and the main fuel tank, and a first supply path for supplying the fuel in the main fuel tank to the auxiliary fuel tank is provided. A fuel pump for sending fuel to the auxiliary fuel tank, and a return path for overflowing the fuel and returning the fuel to the main fuel tank when the liquid level of the fuel in the auxiliary fuel tank exceeds a predetermined height. Supply to the engine by its own weight so that the auxiliary fuel tank can continue fuel supply even if the main fuel tank is inclined and fuel supply via the first supply path is temporarily stopped. Engine fuel supply system. The fuel is supplied to the auxiliary fuel tank so that the flow rate of the fuel in the first supply path is larger than the flow rate of the fuel in the second supply path, and the fuel in the auxiliary fuel tank always overflows. A fuel supply device for the engine according to the above. The upper part of the main fuel tank is protruded upward to form an air chamber, and the end of the return path is communicated with the air chamber, so that the pressure in the main fuel tank and the auxiliary fuel tank can be made the same and fuel can be circulated smoothly. 3. The fuel supply device for an engine according to claim 1, wherein The engine fuel supply device according to any one of claims 1 to 3, wherein a start end of the second supply passage communicates with a bottom surface of the auxiliary fuel tank. A power generator for operating a generator with an engine fueled by the engine fuel supply device according to claim 1. The power generator according to claim 5 is installed at the rear of a tractor head connected to a trailer equipped with a refrigeration trailer or a refrigerated container, and the generated power can be supplied to the refrigeration trailer or the refrigeration unit of the refrigerated container. Like truck.

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