US 2366354 A
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I Jan. 2, 1945. I I D. R. ROBBINS I I 2,366,354 I j PAPER MACHINE CLEANER:
' Filed Oct. 15, 1940 v INVENTOR. DOUGLAS If. jfaaanvs.
Patented Jan. 2, 1945 PAPER MACHINE CLEANER Douglas R. Robbins, Middletown, Ohio, assignor to Douglas Robbins and Company, Middletown,
Ohio, a firm Application October 15,1940, Serial No. 361,297
My invention relates to devices for use in the cleaning of Fourdrinier wires, paperv mill felts, cylinder faces and the like in paper mills.
It has been the practice in some cases to clean paper machine wires, felts and the like with water showers, but this has not done a fully satisfactory job because of the inefliciency of the Jets, and also because it is not usually practical to obtain tremendous pressure and very fine water jets which would really do an eflicient job.
It is the object of my invention to supply a cleaning device the jets of which are of mixed water and air, with the result of doing a, surprise ingly eflicient job of cleaning.
Essentially my jet forming devices consist of a jet of small aperture discharging into a chamher into which air is permitted access, and out through a jet opening considerably larger than the primary jet. The resulting mixture of water and air forced against the screens, or the like acts very efilciently in cleaning them. My novel device is a cleaner for paper making wires, felts, screens and the like in which the jets are of the type noted.
. Inthe drawing:
Figure 1 is an elevational view consisting of a portion of a rocking shower pipe, with the cleaning jets therein, for the above described purpose.
Figure 2 is a detail section on the line 2-'2 of Figure 1 on a larger scale.
The cleaner device of my invention embodies a pipe I, which is mounted at its ends so that it can be reciprocated manually or by power. There should also be intermediate supports for the pipe if it is long. The pipe and its mounting may be alike to any ordinary Water shower pipe as used in connection with paper machines.
I have not shown the water connections for the pipe, but they may be simply a piece of flexible pressure'hose connected to one end of the pipe, the other end of the pipe being closed, with suitable valves for the same.
The reciprocating travel of a pipe using my arrangement when set across a traveling Fourdrinier wire will be of such amount that the jets will have complete coverage, and may be of the order of two and one half inches. This transverse distance will of course be a function of the closeness of spacing of the nozzles.
Spaced along the pipe I, will be placed a series of nozzle elements having bodies 2, threaded into the pipe. At the inner ends of these bodies have plugs 3 therein with small orifices 4 therethrough same being of the order of one thirty-second of an inch. The bodies taper as at 5 from the cylindrical bores in which the plugs are located, to jet passageways 6, which in the form used by me will run around three thirty-seconds of an inch in diameter.
At the plane where the taper begins there are a series of air holes 1 formed in the nozzle bodies, through which air flows freely as the result of the reduced pressure in the bodies resulting from the expanding of the small jets from the restricted orifices inthe plug members 3.
The resulting jet, while not having the velocity of the jets as they enter the nozzle bodies, .are filled with included air, a condition not a mist but approaching that condition. The effect on the matter that adheres to the screens, felts or wire in cleaning it away is quite striking and eifective.
While I do not Wish to be bound by any theory advanced by me, I believe that liquids under high pressure traversing long passages of small apertures will not form a true jet. If however the small aperture passage is short, and communicates with a larger one of considerable length, and the stream is permitted to entrain air in the larger passage, the mixed air and water will form a true jet on emergence.
Having thus described my invention, What I claim as new and desire to secure by Letters Patcut is:
1. In combination with the reciprocating pipe of a screen cleaner in paper machines, a series of spray elements comprising plug portions threaded'into the pipe and having a small bore opening into the pipe, a communicating body portion having an expanded bore, said latter portion having air openings therein, said expanded bore portion communicating with a restricted bore portion providing a jet opening, said spray elements spaced at intervals along the'pipe based ;on the reciprocation range thereof so as to ob- ".tain complete coverage of the screen to be cleaned.
2. In combination with the reciprocating pipe of a screen cleaner in paper machines, a series \of spray elements comprising plug portions threaded into the pipe and having a small bore opening into the pipe, a communicating body portion having an expanded bore, said latter portion having air openings therein, said expanded bore portion communicating with a restricted bore portion providing a jet opening, said spray elements spaced at intervals along the pipe based on the reciprocation range thereof so as to obtain complete coverage of the screen to be cleaned, the restricted bore of the plug portion having an opening into the pipe of around one thirty-second inch in diameter, and the jet opening in the final restricted bore having a diameter v of the order of three thirty-seconds inch.
DOUGLAS R. ROBBDIS.