FR2503264A1 - Fuel heater for diesel engine - has reservoir connected to cabin heating circuit to thaw frozen fuel by heat exchange - Google Patents

Abstract

The heater reliquefies paraffin which has solidified due to cold weather in the flow passages of a Diesel engine. It has a reservoir directly connected to the engine cooling circuit in front of the filter. The paraffin circulates in the reservoir via a helical passage for rapid heat exchange. The reservoir can be connected by a conduit to the heating circuit for the vehicle cabin. The reservoir can have a cylindrical or spherical outer case.

Description

The present invention relates to exchanger type devices
thermal permotté liquefaction of paraffin solidified by the
cold in the supply circuit of diesel engines.

In known devices, this liquefaction is obtained by
a heating resistance system placed either at the level of the filter,
either at the fuel tank.
- difficult job and are often the seat of internal breakdowns.
they require an external electrical source, in this case the
vehicle battery, gold-in cold weather it is illogical to request
-THE battery for this. These resistors to be effective must
-will also heat continuously.

The device according to the present invention makes it possible to avoid these in
drawbacks because it uses the cooling circuit of the
vehicle and benefit from the rapid rise in temperature in this one.

~ Indeed the device placed just before the filter receives in
a high temperature water tank from the de're circuit
-bridissement.In this tank will circulate the fuel through a channel
- spiral connection allowing a rapid heat exchange.
makes the gas oil is brought back to good temperature (the glitter is
-solvent) and can thus pass through the filter in a normal way.
gaz-óil is thus continuously heated and breakdowns due to the
-cluttering of the paraffin filter are eliminated, starting is thus facilitated even in very cold weather.

According to a first variant, the device is connected to the cir
-heating of the vehicle cabin and benefits from the rise
temperature in this one. According to a second variant it can be placed anywhere in the cooling circuit
-ment at the output of the engine.

Claims (2)

CLAIMS I Device for liquefying paraffin solidified by cold in the supply circuits of diesel engines comprising a reservoir (I) connected directly to the cooling circuit (2) just before the filter of the In this tank, the gazzoil (3) will circulate through a spiral pipe (6) allowing rapid heat exchange. This device is equipped or not (depending on the types of engines) dgun. air vent (5) and a 3-way valve (4) allowing use in summer and winter. '2 Device according to claim I, characterized in that the connection is made directly to the heating circuit- of the cabin of the vehicle.  3 Device according to claim 2, characterized in that it is mounted just before the filter. If the vehicle is equipped with several filters, the device will be mounted before the 1st filter and possibly before each filter.  @ 4 Device according to claim I characterized in that the fuel line inside the tank can take various forms (spiroidal, tubular, annular, water bath and others)  -5 Device according to claim I, characterized in that the  tank may have a cylindrical, cubic, spherical shape or any other shape adapted to the space available for mounting the device.  '6 M device according to the claim Iscaractérisé in that the  construction materials of the various elements may be of a nature  next:  - plastic and synthetic materials which can be shaped or  molded  - metals or alloys  - glasses  - rubber and derivatives.  7 According to claim I the device allows a gas return  @oil tempered by the pump to the main tank of the vehicle  which facilitates the thawing of the paraffin contained in this tank.