Fluid sprinkling – spraying – and diffusing – With viscosity or temperature responsive control means
Patent
1988-06-30
1989-10-31
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With viscosity or temperature responsive control means
1525001, 239124, 2392841, B05B 1210, B60S 146
Patent
active
048771864
DESCRIPTION:
BRIEF SUMMARY
Normally a windshield washing system for motor vehicles comprises a washing liquid reservoir from which the washing liquid is supplied to at least one jet in a feed pipe via a pump driven by an electric motor. In most cases an impeller pump is used and a non-return valve is installed into the feed pipe so that after the pump being switched off the washing liquid is prevented from flowing back into the feed pipe. Thus it is ensured that very little time passes between switching on the pump and the washing liquid issuing from the jet, i.e. it ensures a quick response from the washing system.
As to these washing systems in which, for ensuring a quick response, the feed pipe is not emptied, it is of a disadvantage however, that particularly in the portion next to the jet the anti-freeze liquid mostly added to the washing liquid evaporates and that therefore, without taking additional measures, it cannot be relied on that the washing liquid is prevented from freezing. Therefore heated jets have been used. However, thus the costs of production essentially increase and the installation becomes much more difficult.
Therefore the object of the present invention is to improve operational security of such a windshield washing system by easiest means.
Thus the invention is based on the idea that, so to speak, the operational security can be improved by changing the mode of operation of the windshield washing system. According to the present invention it is provided that in summer the washing system is operated as usual, i.e. with a feed pipe not emptied, whereas in winter, i.e. in low outdoor temperatures, a mode of operation with an emptied feed pipe is chosen. Thus in many cases the washing liquid can be prevented from freezing, but it has to be taken into consideration that during winter operation it takes more time to respond by the measures according to the invention. However, this prolongation of time does not affect traffic security in the same way as a washing system that is totally ineffective would do.
In the simplest embodiment both modes of operation can be given via an arbitrarily actuable switching element, but an embodiment is preferred, in which this switching element automatically switches over in dependence of the outdoor temperature and thus predetermines the mode of operation of the washing system.
As to a washing system comprising a non-return valve in the feed pipe it can easily be guaranteed that the portion of the feed pipe between the non-return valve and the jet is emptied by providing a branch there, which branch is opened or, in case of higher temperatures, is closed via a valve. As to the simplest embodiment in this portion of the feed pipe washing liquid could thereby flow outside via the valve. However, in order not to lose this amount of washing liquid, according to an especially preferred development of the invention it is suggested that the branch switchable via the valve shall be led back to the portion of the feed pipe between the pump and the non-return valve. Thus, so to speak, a switchable bypass to the non-return valve is provided, which bypass in low outdoor temperatures makes sure that the portions of the feed pipe in front of and behind the non-return valve are connected, but that in high outdoor temperatures this connection is cut.
There are also washing systems, in which--without a non-return valve--the feed pipe is prevented from emptying simply because of the special construction of the pump. In such an embodiment, for the purpose of solving the problem described at the beginning, the direction of rotation of the pump could be changed during winter operation and thus the washing liquid could be drawn back of the feed pipe into the reservoir. Thereby it is of importance that one of the modes of operation are given via a switching element, whereby during summer operation a quick response of the washing system is guaranteed. The invention is described below by means of the embodiment schematically illustrated in the drawing.
The washing system comprises a liquid reservoir 10
REFERENCES:
patent: 2576198 (1951-11-01), Stuart
patent: 2914256 (1959-11-01), O'Shei
patent: 3516610 (1970-06-01), Stevens
patent: 3901444 (1975-08-01), Maltbie et al.
Forman Michael J.
ITT SWF Auto-Electric GmbH
Kashnikow Andres
Seitter Robert P.
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