JPH0563946U - Fuel tank for vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] A high-temperature return fuel that is re-consumed through the engine is reformed and mixed with the supply fuel, and even if the supply fuel becomes small, there is no bubble and there is no decrease in specific gravity. To provide a fuel tank that enables stable supply of fuel as engine supply fuel. [Structure] A reserve tank having at least a wall surface as a cooling structure and a main tank capable of receiving a liquid transferred from the reserve tank as an overflow liquid, and its discharge port faces the wall surface having the cooling structure to the reserve tank. In addition, the fuel return pipe is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel tank of a diesel engine-equipped vehicle or the like of a type in which some of the fuel that has not been consumed is returned to the engine and is then consumed again. The present invention relates to a fuel tank for a vehicle, which can suppress various problems caused by foaming, temperature rise, or decrease in liquid specific gravity, etc., which occur when mixed with fuel oil.

[0002]

[Prior Art]

 Conventionally, as a fuel tank of a diesel engine that partially reconstitutes some unconsumed fuel from the injection pump for re-consumption, for example, a structure in which the return fuel is once introduced into the reserve tank and then returned to the main tank side It is generally taken.

[0003]

[Problems to be solved by the device]

 However, since the return fuel introduced to the reserve tank side through the engine is in a high temperature state, if there is sufficient refueling fuel in the main tank side, the heat retained by the return fuel will be absorbed by the refueling fuel. However, in such a structure, when the fuel in the main tank falls below a predetermined level, the high temperature return fuel raises the temperature of the fuel in the main tank, and as a result, the supplied fuel is not desirable. Not only will it be supplied to the engine in the state of high-temperature fuel, but its temperature rise will also reduce its specific gravity, reducing the output of the engine that uses that fuel and, as a result, making fuel consumption worse. ..

Further, when the high-temperature return fuel is introduced into the reserve tank, due to its impact and high temperature, bubbling and fuel evaporation phenomena occur in the reserve tank, and these high-temperature fuels are discharged to the main tank side. When the fuel is supplied to the engine, the fuel supplied from the main tank to the engine contains bubbles and the like to reduce the apparent specific gravity thereof, further causing a reduction in the output of the engine.

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to enable rapid cooling of the return fuel and to mix the return fuel and refueling fuel to supply the fuel supplied to the engine to the main engine. It is an object of the present invention to provide a vehicle fuel tank capable of stably and high quality supplying a fuel that does not contain bubbles and does not have a decrease in specific gravity regardless of a decrease in the level of fueled fuel in the tank.

[0006]

[Means for Solving the Problems]

 The present invention comprises, firstly, a reserve tank having at least a wall surface as a cooling structure and a main tank capable of receiving a liquid transferred from the reserve tank as an overflow liquid. It is characterized in that a fuel return pipe is arranged with its discharge port facing a wall surface having a cooling structure.

[0007]

[Action]

 According to such technical means, the return fuel is collided with the wall surface formed in the cooling structure and operated at the lowest temperature, so that the highest retained temperature is taken and the return fuel is directly supplied. It is separated from the main tank that supplies the supply fuel by storing it separately in a reserve tank that cools, instead of using it as the supply fuel, so that the return fuel moves to the main tank as an overflow liquid, and the supply fuel When it becomes a part of, it is cooled sufficiently. Therefore, the returned fuel to be transferred does not foam the supplied fuel, which is a part of the returned fuel, nor cause a situation in which the specific gravity is lowered.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them, unless otherwise specified. It's just an example. FIG. 1 is a vertical cross-sectional view showing a fuel tank according to an embodiment of the present invention. A reserve tank 2 that shares an upper space 1a of a main tank 1 is connected to form an integrated fuel tank 10. There is. The reserve tank 2 has a lower main body that is independent and vertically extends from the upper portion of the fuel tank 10. The upper edge of the reserve tank 2 is shared by a position adjacent to the main tank 1. When the liquid stored in the reserve tank 2 is transferred to the main tank 1 as a result, the upper edge is a weir that flows into the main tank 1 as an overflow liquid having a head H of the reserve tank 2. It is supposed to be. The lower body has a cooling structure in which the outer wall of the lower body is formed by cooling fins 3, and the bottom of the lower body can communicate with the lower portion of the main tank 1 through a communication pipe 5 via a normally closed cock 5a. A fuel return pipe 4 is inserted from the upper part of the reserve tank 2, and a return fuel G2 returned from the outside of the machine by an injection pump (not shown) can be stored in the reserve tank 2. The discharge port 4a of the fuel return pipe 4 is located at an arbitrary position sufficiently lower than the liquid level when it is full, and the opening face thereof faces the wall surface of the cooling fin 3 so that the return fuel G2 is When ejecting from the ejection port 4a, it is possible to collide with the wall surface. On the other hand, the position of the lower surface 9a of the fuel injection pipe 9 inserted into the main tank 1 is such that, when the refueling operation is completed and the refueling fuel G is filled up, the fuel level thereof is above the reserve tank 2. It is positioned so that a predetermined overflow height H can be secured from the edge, a fuel injection nozzle (not shown) can be inserted into the upper portion of the fuel injection pipe 9, and a cap 9b is capped on the upper surface thereof. It is like this. When the fuel in the main tank 1 is used up and the so-called gas is exhausted, the cock 5a can be opened to avoid the emergency.

As in the prior art, the fuel tank 10 sucks in a separator 8 at a predetermined position for preventing liquid level fluctuation, which has a communication port at the bottom, and sludge on the bottom of the main tank 1. An outlet pipe that is inserted into the main tank 1 and has a suction port wrapped around a filter 7a at a certain height so that the supply fuel G1 can be supplied to communicate with a feed pump (not shown). 7, normal level parts such as a liquid level 6 for controlling the liquid level of the fuel in the main tank 1 and a drain 1b for discharging internal liquid provided on the bottom are provided.

Next, the operation of this embodiment will be described. The high-temperature return fuel G2 transferred from an injection pump (not shown) is vigorously urged by the fuel return pipe 4 from its discharge port 4a into the cooling fin 3 to be received in the reserve tank 2 and diffused therein. Thus, the quantity of heat retained in the return fuel G2 is transferred to the wall surface forming the cooling structure and radiated to the outside through the wall surface. The heat removal operation here is performed by bringing the materials having a large temperature difference into contact with each other, so that the most efficient cooling operation is performed. Then, the released fuel G2 thus radiated is continuously cooled by the vehicle through the cooling fins 3 during the storage time thereof, and the temperature of the returned fuel G2 is lowered. Then, at the time of the discharge, the fuel G2 having the fuel vapor or bubbles is stored in the reserve tank 2 and, while being at a low temperature, defoaming and condensation proceed, and flow to the main tank 1 as an overflow liquid. When transferred, the supplied fuel G1 is mixed as a stored liquid in the low-temperature reserve tank 2 containing no bubbles and steam.

The fuels stored in the main tank 1 are fresh refueling fuel from the fuel injection pipe 9 and return fuel that is cooled and transferred. It is known that when there is no stored liquid in the main tank 1, the cock 5a that connects the two tanks 1 and 2 is opened and used as the supplied fuel. In this case as well, since it is supplied from below, there is no mixing of bubbles or fuel vapor.

[0012]

[Effect of the device]

 As described above, according to the present invention, when the returning fuel having a high temperature through the engine is supplied to the engine as fuel again, only the fuel that has been cooled effectively is used as the refueling fuel. It is possible to supply the fuel to the engine while ensuring a good condition of the supplied fuel while lowering the temperature, suppressing the mixture of bubbles, and maintaining the specific gravity by mixing and supplying. It is possible to provide a fuel tank that has various advantages such as the above, and does not cause a malfunction of the return fuel to the engine for the first time in the present invention, and its practical value is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view showing a fuel tank according to an embodiment of the present invention.

[Explanation of symbols]

 1 Main Tank 2 Reserve Tank 3 Cooling Fin 4 Fuel Return Pipe 10 Fuel Tank G2 Return Fuel

Claims (1)

[Scope of utility model registration request] 1. A reserve tank having at least a wall surface as a cooling structure and a main tank capable of receiving a liquid transferred from the reserve tank as an overflow liquid, wherein the reserve tank is provided with a discharge surface on the wall surface having the cooling structure. A fuel tank for a vehicle, characterized in that a fuel return pipe is disposed with the outlets facing each other.