Fluid sprinkling – spraying – and diffusing – With selective proportioning or correlated flow for plural...
Patent
1984-11-20
1987-03-24
Peters, Jr., Joseph F.
Fluid sprinkling, spraying, and diffusing
With selective proportioning or correlated flow for plural...
239172, 239304, 239305, 417428, B05B 700, A01G 2509, A62C 3100, A62C 3130
Patent
active
046519270
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plant for de-icing, in particular surfaces of aeroplanes, comprising the use of at least two sources of liquid media that are different from each other and capable of being sprayed separately or as a mixture.
With a view to flight safety, heavy demands are made on the efficiency of the de-icing operation, and in this context it is important to ensure that the spray liquid is of the desired type according to whether it should consist of one medium or a mixture of several media.
The prior art teaches to control the type of spray liquid dispensed by means of an adjustable three-way valve, a volumetric flow meter or by adjustment of the revolutions of a rotary pump, but experience shows that these methods of control frequently fail to be sufficiently accurate. A further drawback of this prior art is that it involves no control of which type of spray liquid is dispensed.
It is the object of the present invention to provide a plant which in a simple manner affords the possibility of accurate adjustment of the desired type of spray liquids.
According to the invention, this object is achieved by the plant comprising a number of positive liquid pumps corresponding to the number of media, which pumps all have the same capacity or a predetermined interrelated capacity ratio (liters/min) and terminate in a common spray pipe, and where the connection of the pumps to the sources of media includes at least one multi-way valve for connecting at least one of these sources to at least one of the pumps.
In this plant the composition of the spray liquid to be dispensed is thus determined solely on the basis of the capacity of the liquid pumps. As a result, it is possible to avoid mixing valves which may be not only inaccurate but also have a throttle effect. De-icing media are frequently sensitive to throttling down, as this may cause the media to coagulate. In the plant according to the invention this risk of inaccuracy in terms of operation has been eliminated, too.
The plant according to the invention furthermore allows it to be operated in a simple manner by means of a hydraulic system. This renders the system suitable for mobile, such as self-propelling de-icing stations. Seeing that the pumps are driven by respective hydraulic motors, the system according to the invention may be designed to the effect that the motors of at least two liquid pumps are connected to a common hydraulic pressure pump controlled by way of pressure compensation to work with at least two pressure stages subject to a ratio corresponding to that of the capacity of at least one pump to the total capacity of both pumps. This ratio, for instance, could be 1:2. Such an embodiment offers the specific advantage that the liquid system need not include a relief valve which may cause coagulation, as an increase of pressure in the system, for example as a result of the jet being closed by an adjustable flow interrupter arranged in the spray pipe, may at once be transmitted through the hydraulic motors to the hydraulic pressure pump and reset same. It is achieved at the same time that the pump delivering de-icing medium does not work it excessively.
Furthermore, according to the invention, it is possible to provide in a simple manner efficient control as to whether the desired type of spray liquid is dispensed, as the hydraulic control of the pressure pump and the control of the multi-way valve include switches for independent detection of the operating position of the flow system.
The invention will be further explained below with reference to the drawing, which by way of an operating diagram illustrates an embodiment of a de-icing plant designed according to the invention.
The plant shown includes two sources of liquid media, there being provided a tank 10 for water and another tank 12 for de-icing medium.
By means of a pipe 14 the tank 10 is connected to the suction side of a pump 16, whose delivery side is connected to a discharge pipe 18.
By means of a pipe 20 the tank 12 is connected to the suction side of a pump 22,
REFERENCES:
patent: 3049267 (1962-08-01), Edwards et al.
patent: 3097764 (1963-07-01), Loeser
patent: 3421694 (1969-01-01), Muller
patent: 4113182 (1978-09-01), Brago
patent: 4376512 (1983-03-01), Kistner
Burkhart Patrick N.
Peters Jr. Joseph F.
LandOfFree
Plant for de-icing surfaces does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plant for de-icing surfaces, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plant for de-icing surfaces will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1348950