FR2565179A1 - Device for heating the windscreen wiper water for a motor vehicle. - Google Patents

Abstract

In the water hose circuit there is inserted a tube element 1 made from heat-conducting material and of a thickness sufficient to allow a housing 2 to be made on its external surface and several layers of tube coils 3 made from heat-conducting material, forming a continuous winding, are placed one upon the other in this housing, the layers of coils being inserted in the washing water circuit.

Description

 Heating devices for wiper water in motor vehicles are known. These devices bring water, contained in a jar or tank, near the wiper blades.

 Until now, the washing water supplied to the brushes has been cold water, which generally does not allow effective cleaning.

 To overcome this drawback, it was thought to use the cooling water heated by the engine by taking it from the upper hose of the radiator. However, the known devices are not entirely satisfactory for several reasons.

 The most important is that the water, heated in a coil of small dimensions and small internal diameter mounted on the hose, does not reach a sufficient temperature or a sufficient volume. The temperature is not sufficient due to the reduced dimensions of the coil and when the small volume of water in the hose has been used, the water which comes next is practically cold.

 The object of the invention is to remedy this drawback, by means of a configuration of the device making it possible to obtain a larger volume of hot water and at a higher temperature.

 To this end, the subject of the invention is a device for heating wiper water for a motor vehicle, characterized in that in the hose circuit is inserted a tube element made of material which conducts heat and a thickness sufficient to allow a recess to be formed on its external surface e several layers of turns of tube of conductive material of the hauler forming a continuous winding, are placed one on the other in this recess, the layers of turns being inserted in the washing water circuit.

 According to another characteristic which the invention may have, the spiral tube housed in the recess is protected by a heat insulating sleeve.

 According to another characteristic which the invention may have, the ends of the tube element each have at least three decreasing diameters so that the tube element can be mounted on practically all existing vehicles.

 According to another characteristic which the invention may have, three layers of tube turns are housed in the recess.

 In order to better understand the invention, a nonlimiting embodiment will be described below with reference to the appended drawing in which the single FIGURE represents in axial section a device for heating the wiper water according to l 'invention.

The device shown in the drawing comprises a tube element I, preferably made of brass, the two ends of which each have three consecutive diameters a, b, c, corresponding practically to the diameters of the hoses of all existing vehicles. In the middle of the tube element, a recess 2 has been made in which a coil is arranged, or tube winding 3 in a spiral on 3 layers, with insulating sleeve 3a
The tube element 1 is inserted into the hose circuit, not shown, by pushing the ends a, or b or c into the hose which has been previously cut in two places in the region of the insertion in order to be able to place the tube element 1. Then connect the ends of the tube winding 3, for example at 4 and 5, to the washing water tube previously cut to the appropriate length, and not shown.

When the wiper of the car, on which the device according to the invention is mounted, is put into operation, the washing water passes into the coil 3 where it is heated. As the coil has three layers of turns in the example chosen, and since it is housed in a recess concentrating the heat, the water in the coil takes a temperature close to that of the water which circulates in the hose. One knows that in practice, the water in this hose is at a temperature between 800 and goo
The result is a particularly effective cleaning of the windshield. In fact, the water sprayed on this windshield is almost boiling and quickly rids the windshield of stuck insects, dust and greasy stains which do not allow satisfactory visibility. The quantity of hot water projected is much greater than that obtained in known devices.

Claims (4)

 1. Wiper water heater for a motor vehicle, characterized in that in the hose circuit is inserted a tube element (1) made of heat conductive material and of sufficient thickness to allow to form a recess (2) on its external surface and several layers of tube turns (3) of heat conducting material, forming a continuous winding, are placed one on top of the other in this recess, the layers of turns being inserted in the washing water circuit.  2. A wiper water heating device according to claim 1, characterized in that the layers of tube turns housed in the recess are protected by a heat insulating sleeve (3a).  3. A wiper water heating device according to claim 1, characterized in that the ends of the tube element each have at least three decreasing diameters (a, ó, c) so that the element tube (1) can be mounted on almost all existing vehicles  4. A wiper water heating device according to claim 1, characterized in that three layers of tube turns (3) are housed in the recess.