US2142778A - Soot blower - Google Patents

Description

Jan. 3; 1939. I H. E BRELSFQRD ET AL 2,142,778-

sooT BLOWER Original Filed Sept, l0, 1952 ATTORNEY Patented Jan. 3, 1939 PATENT OFFICE SOOT BLOWER 4Harry E. Brelsford, Birmingham, and Curtis L.

Howse and Frank Bowers, Detroit, Mich., as-

signors to Diamond Power Specialty Corporation, Detroit, Mich., a corporation of Michigan Original application September 19, 1932, Serial No. 632,614. Divided and this application September 10, 1934, Serial No. 743,398. Renewed December 30, 1937 1 Claim.

This invention is directed to means for cleaning boilers or other heat exchange apparatus and contemplates the provision of means for discharging adjacent the heating surfaces thereof, jets of cleaning fluid to dislodge from said surfaces deposits Which may be formed thereon.

This application is a division of our co-pending application, Serial Number 632,614, iiled September l0, 1932.

The numerous objects and advantages or the invention will become apparent as the following description proceeds particularly When reference is had to the accompanying drawing wherein like reference characters designate corresponding parts throughout all views and wherein Fig. l is a plan view of one form in which our invention may be embodied;

Fig. 2 is a sectional View taken substantialll7 on the line 2-2 of Fig. 1;

Fig. 3 is a sectional View taken substantially on the line 3-3 of Fig. l;

Fig. 4 is a section through the pilot valve controlling the pistons actuating the element and valve;

Fig. 5 is a detail view of the piston ring used in the piston shown in Fig. 2.

Referring now to Figures 1 to 5 inclusive, When air is admitted by a suitable controller adapted to supply air in puffs through linel |02 on top of the piston |32, this is depressed lcarrying with it the paWl |33 which acts against the spring |44 to rotate the gear |45. Gear |45 is fixed to a suitable blower element 91 adapted to discharge cleaning fluid adjacent portions of the fluid heater or the like to be cleaned.

In the line |02 leading from the controller is provided a T |46 from which leads line |41 to the pilot valve |48. At the same time that air is admitted on top of piston |32 it enters the pilot valve |48 through line |41, acting on the face of piston |49. This is connected through rod |56 to valve |5| so that when the piston |49 is moved to the right in Figure 4 it moves the valve l5| from its seat against the action of the spring |53.

The control valve |58 normally rests against its seat |59. The valve |58 is attached through rod |34 to piston |69 mounted in piston housing |66. Cleaning uid from the supply line 6l entering the operating head through opening |36 acts both on the top of the valve |53 and on the face o1" the piston |60. Piston ring |35 is provided in piston |60, the piston ring being provided With a graduated opening |35 (shown in Figure 5) admitting the cleaning uid to the space |31 in the piston housing |68. Thus, under normal conditions the same pressure is established on each side of the piston |60, the valve being kept closed by the action of spring |69.

Upon venting of the pressure in the space |31 above the piston it is obvious that the pressure of the cleaning fluid acting on the face |38 of piston |60 will move the piston against spring |69, to open the valve.

It is the function of the pilot valve |48 hereinbefore described to provide a vent for the pressure in the space |31 permitting the valve to open.

As hereinbefore described, when the iiuid pressure is admitted to the pilot valve |48, it moves the valve |5| from its seat |52 so that the pressure from the space |31 in the piston housing |68 passes through line |54, through valve |5| on top of the valve |1|.

Referring now to Figure 3, it Will be noted that the lever |55 is pivotally supported on the lug |56, this lever being adapted to engage the cam |51 xedly mounted on gear |45. Cam |51 is made of the desired length in order to x the period of opening of the supply valve |58. Thus, the length of the cam determines the fraction of rotative movement of the element 91 over which the control valve |58 is open.

When the lever |55 is engaged by the cam |51 it raises the stem |10 upwardly, moving the valve |1| away from its seat |12. When the valve |1| is -moved from its seat |12, iiuid pressure, admitted to the pilot valve |48 from the space |31 in the piston housing |68, passes to exhaust through openings |39.

It will thus be seen that when the controller admits the cleaning uid to line |02 through T |46 and line |41 to pilot valve |48, that the result is to vent the pressure from space |31 only when the lever |55 has engaged the cam |51 so that both of the valves in the pilot valve are open.

I f this trigger |55 does not engage the cam |51 the pilot valve |48 will not be fully open to exhaust and, consequently, the supply valve |56 will not open.

It will be noted from Figure 2 that the amount of movement of the piston |60 is determined by the abutting of the skirt of the piston against the shoulder |61. This movement is suicient to Withdraw the valve |58 entirely Within the piston housing |68, thus providing a relatively unobstructed passage for the cleaning fluid from line 8| to element 91, affording a construction giving the minimum pressure drop through the operating head.

Thus, in the operating head, as shown in Fgure 3, the gear may be provided with eighty teeth. The pawl |33 may be adapted to actuate gear |45 the distance of four teeth at each power impulse, thus requiring a total of 20 impulses to rotate the nozzled tube 9T through exactly 36 To accomplish this result with the second type of controller described, the extent of the arcuate port 234 may be made with such relation to gear 245 as to insure that the gear 245 is rncved a distance of twenty teeth by the pawl 2553 while the arcuate port 234 in the rotatable valve member 233 is in registry with one of the hoies 235 in the stationary Valve plate 235. It has been found in practice that such a proportioning of the parts aiords a very satisfactory operation but it should be pointed out that these proportions may be varied to secure any desired actuation of the boiler cleaner operating head. With the construction of the second controller it is convenient to Limit this amount of arcuate actuation to one complete revolution or less, whereas in the controller of the first type described, arcuate travel may very conveniently be three complete rotations or any fraction thereof. It is obvious that the proportions of the parts might be varied in both instances to secure any desired results.

While one form of the invention has been described in some detail, it is to be clearly understood that the description is for the purposes of illustration only and is not denitive of the limits of the inventive idea. The right is reserved to make such changes in the details oi construction and arrangement of parts as will fall within the purview of the attached claim.

What we claim as our invention is:

In a uid heater cleaner, a rotatable blower element, a source of cleaning uid under pressure, a cleaning uid supply pipe connecting the source of cleaning uid to the blower element, a Valve in said supply pipe controlling the flow of cleaning uid from said source to said blower element, a piston connected to said valve for actuating the same, a cylinder in which said piston is mounted, said cylinder being so associated with said supply pipe that one side of the piston in the cylinder is exposed to the pressure of the cleaning fluid in the supply pipe, means including a second piston adjacent said blower element for moving the same, a cylinder in which said second piston is mounted, means for intermittently supplying cleaning uid from said source to said last mentioned cylinder to effect a reciprocation of the piston therein and a step by step movement of said blower element, a plunger exposed to the pressure of the cleaning uid acting on said second mentioned piston, said plunger thus being adapted to reciprocate in unison with said second mentioned piston, a valve connected to said plunger for controlling the exhaust of pressure on one side of said first mentioned piston whereby the cleaning fluid acting on the other side of said rst mentioned piston may move the same to open said Valve, and a second valve so controlled by the rotation of said blower element for .controlling the effective operation of said plunger actuated valve, that said main cleaning iluid controlled valve is periodically opened and closed during a predetermined portion of the rotation of the blower element.

HARRY E. BRELSFCRD. CURTIS L. HOWSE. FRANK BOVERS.

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