FR2805003A1 - I.c. engine fuel heater has coiled tube carrying fuel through insulated housing containing hot water from heating system - Google Patents

Abstract

The fuel heater consists of a housing (1) with a thermally insulated outer wall (16) and an inner element (2) forming a narrow passage (3) with a large heat exchange surface. The inner element is filled with hot water (17) from the vehicle heating system via an inlet (10) and outlet (11) and contains a coiled tube (7) through which fuel is circulated between transfer ducts (4, 5) and an outlet (8) leading to fuel injectors.

Description

 The present invention relates to a device for heating liquid fuels mainly gasoline and fuel oil in a circuit placed before the entry into combustion to obtain a perfect combustion. especially on all motor vehicles, boats and all other vehicles using liquid fuels.

The invention will be particularly intended for automobiles as well as for heavy goods vehicles. without power limitation or horses. but also to the ships whether they are maritime or fluvial. the list of vehicles is not exhaustive.

 For years, the advantages of heating fuel, mainly boilers, have been known. It is known that fuels heated before their admission to injectors obtain much better results in terms of combustion, this before being demonstrated by the largest laboratory. CETIAT.

Optimum heating allows fuels to increase their density. As for oil, oil and other fuels less noble than gasoline, the advantages are even more important since not only their density increases, but their viscosity decreases very significantly. which allows them to optimize combustion in a perfect way, and to reject less waste polluting the atmosphere.

To obtain these results. it is imperative that the heat exchange be direct and immediate. For this, large transfer area is required. this one being obtained by the resultant of two trays nested one inside the other allowing a very narrow passage of only 3 millimeters and thus offering a large surface of heat exchange.

 The apparatus presented in this patent application is a very big advance over the economizers - fuel cleaners previously presented for motor vehicles explosion. The apparatus consists of a first tank (1) in which a second tank (2) resting on supports (15) which tanks (1, 2) are closely separated by a thin passage of fuel, called tank having a large heat area. The tank (3) is fed by an inlet tube (9) of the cold fuel Inside the tank (2) a coil (7) is fed by two tubes (4, 5) themselves fed with fuel from the tank (3) formed bins (1,2).

The fuel already heated led by the inlets (4,5) feeds the tube (6) which in turn feeds the coil (7) with hot fuel The hot fuel of the coil (7) is discharged to the injectors by the (8) ). The apparatus is a lid (12) screwed or sealed to the tray (1). This cover (12) being insulated by thermally insulating materials (18) very common on the market.

The tank (1) composed of two walls (the lb) is insulated by thermal insulating materials (16). The originality of the fuel heater is characterized by the fact that it is directly connected to the hot water circuit (of the vehicle heater, which is in a closed circuit with an inlet (10) of hot water (17) filling the tank (2) in which is bathed the coil (7) as well as the arrivals (4,5,6) This hot water (17) in perpetual movement instantly communicates its heat to the tank (3) thanks to the large heat exchange surface of the tank (2).

 Thus our invention requires no electrical source of the vehicle and takes advantage of the natural element of the vehicle itself: the hot water of the heating circuit of the vehicle which is always at a constant temperature of 85 to 90 C.

In this way cold fuel arriving through the tube (9) flows into the tank (3) from the space of the tanks (1, 2), the tank (3) being adjacent to the tank (2) filled with hot water this hot water (17) instantly communicating its heat to the fuel tank (3).

The already heated fuel tank (3) flows into the arrivals (4,5) and into the tube (6) which feeds the coil (7), the assembly bathing in hot water (17) 85/90 C, thus offering a very good and immediate heat exchange with fuel.

The hot fuel of the coil (7) is sent into the tube (8) to arrive directly at the injectors of the vehicle.

With the present invention using only fuel heating means, the hot water (17) of the vehicle heating circuit which is between 85 and 90 ° C, will no longer have servo constraints due to heating resistors. will have more constraints of electronic controls which themselves are constrained to temperature sensors, thermal fuses and other advanced security to meet all eventualities of defections.

Our invention takes advantage free of all these securities which are already provided vehicles. The present invention is of such simplicity of use that it presents no difficulty of installation for those skilled in the art.

It must be taken into account that the present invention represents a very great interest for energy savings. but a greater, very great interest for the ecology and cleanliness of our environment when we know the great problems related to air pollution which are responsible for motor vehicles explosion. whether they are terrestrial or maritime. NOMENCLATURE # 1 Exterior tank composed of walls 1b.

 # 2 Hot water tank 17 containing coil 7 # 3 Tank of 3 nun thick composed of tanks I, 2. Tank fuel inlet 3 Tank fuel inlet 3 # 6 Intake pipe to coil 7 # 7 Serpentine or circulates the hot fuel # 8 Hot fuel exhaust tube to the injectors. # 9 Cold Fuel Inlet Tube # 10 Hot Water Inlet Hose for Vehicle Heating System # 11 Hot Water Return Hose to Vehicle Heating System # 12 Tank Closure Lid 1 # 13 No screw on cover 12 of Tray 1 # 14 Seals for tube 8 # 1 5 Tray 2 support pads # 16 Thermal insulation of Tray 1 # 17 Hot water of the vehicle heating circuit of Tray 2 at 85/90 C <B> 9 </ B> 18 Thermal insulation of the lid 12

Claims (5)

1. Fuel heating device comprising a heated circuit in which fuel circulates before the combustion admission, in particular in motor vehicles of all kinds, terrestrial, maritime, river, characterized by a heating body formed of a first external element (1) thermally insulated (16) a second inner member (2) combination of these two elements (1.2) to obtain a thin passage (3) of a large heat exchange surface. 2. Device according to claim 1, characterized in that the element (2) filled with hot water (17) of the heating circuit of the vehicle comprises a coil (7), in which the fuel circulates, bathed in water. element (2) which comprises an inlet (10) of hot water (17) and a return <B> (11) </ B> of this hot water (17). 3. Device according to any one of claims or 2. characterized in that it comprises two elements (1.2) separated by a thin passage of large area for immediate heat transfer heat of the hot water (17) of the vehicle heating circuit, fuel. 4. Device according to any one of claims 3, characterized in that it comprises two transfer ducts (4.5) discharge (8) to the injectors and a conduit (6) bringing the fuel to the coil (7). 5. Device according to any one of claims to 4 characterized in that the element (1) consisting of two walls (la. Filled with insulation to keep heat to the maximum, closed a lid (12) himself isolated by thermal insulators.