FR2505405A1 - Fuel heater for IC-engine - has fuel passed through coil in casing connected to engine coolant duct - Google Patents

Abstract

The heater is connected to the cooling circuit of an ic-engine, formed of an iron cylinder (1) with a coil (2) immersed in the heated engine coolant. The coil provides a heating duct to heat the fuel before it is fed to the injection pump. The cylinder is placed in the coolant duct with end connections for it, with the coil formed as a section of the fuel feed pipe. The cylinder is fixed to the coolant duct using rubber mountings.

Description

FUEL HEATER FOR DIESEL ENGINE
The present invention relates to combustion engines, diesel engines.

 In known engines of this kind1 the fuel supply is made by means of a pump called: "feed pump" according to the following diagram: fuel filter feed pump injection pump injectors. Likewise, the type of cooling of these engines is mixed (by water and by air) and is generally carried out as follows: during its circulation, the water transports heat to the radiator which is cooled by the ambient air.

We know the disadvantages of this kind of engine, either: - smoke inherent in starting the engine, - low engine recovery, - engine breakdown, - fuel fuel on the road in winter.

 The "fuel heater" according to the invention avoids these drawbacks. The device according to the invention is associated with the engine cooling system; celuki being inserted on the engine return water hose.

The heater is an iron cylinder crossed lengthwise by a copper tube of small diameter wound in a spiral2 and through which the fuel passes
The device according to the invention is characterized by a means of heating the fuel made possible insofar as the device is placed on the hose of the water return.

 According to a first variant, it is a question of diverting the fuel supply circuit of the engine in order to pass the diesel oil into the heater. To do this, simply disconnect the fuel supply pipe after the passage of that c; in the diesel filter, in order to connect it to the copper tube controlling the arrival of fuel in the heater. After passing through the heater, the diesel is routed to the injection pump, the copper tube - located at the other end of the heater and controlling the outlet of the diesel - being connected directly to the injection pump.

 In a second variant, it involves cutting the rubber hose from the water return along the length of the heater, in order to interpose it by fixing the two ends of the heater to those of the hose cut by means of two collars.

 The device according to the invention enables the engine to be supplied with heated diesel oil. Thus the device allows: pulverized agas-oil to ignite and burn more easily, implying better engine performance and fuel economy.

Since the breakdown of the engine is caused by the arrival of cold gas oil on the engine, this drawback is reduced by the rise in the temperature of the fuel. This increase in temperature also avoids starting fumes and gives more power to the engine during recoveries.

 In addition, since the diesel not used by the injection pump is returned to the tank, the fuel contributes, despite its loss of calories, to slightly warm the diesel in the tank. The whole of this heating system thus avoids the problem of diesel fuel crying on the road in winter. This same heating of the diesel makes it possible to resort less often to the preheating system after the even long stops of the vehicle, when the latter has rolled enough so that the heating of the diesel has been able to take place; this thus implying a saving of battery.

The device as it was designed works without any electrical connection and works only on the water temperature regulated by the engine thermostat.

 An attached drawing is a sectional view of the device.

As presented, the device comprises a cylinder 1, fixed on the rubber tubing at the ends of the rite cut by two iron tubes 4. In cylinder 1, passes a copper coil 2, one of the ends controls the arrival of the diesel (1) in the iron cylinder 1, while its other end controls the outlet (2). On the other hand, the hot water from the return hose passes through this same cylinder 1, the copper coil 2 is thus "drowned" in hot water. It should be emphasized that two independent passages of very distinct liquids are carried out in the heater, either: - passage of water in the cylinder 1, - passage of the diesel oil in the copper coil 2,
The coil being placed inside the cylinder 1, the hot water contained and passing through this cylinder contributes to heating the diesel oil in the copper coil.

 The device which is the subject of the invention can be used and adapted on diesel engines fitted with a water cooling system.

 It is adaptable on vehicles of all kinds.

Note that the fuel economy that the device makes is appreciable, ie from 30 to 50 96.

Claims (3)

 1 The heater associated with the engine cooling circuit, formed of an iron cylinder 1, crossed by a copper coil 2 immersed in the hot water of the cylinder coming from the return hose, characterized in that it comprises a means of heating the diesel before the arrival of heat in the injection pump.  2. The heater according to claim 1, characterized in that the heating means  is made possible by the use of hot water return, the cylinder being placed  on the tubing and connected to the ends of the rite 4.  3. The warming according to claim 2, made possible by the diversion of the  fuel supply circuit thus passing through the heater.