US1914744A - Boiler-cleaning apparatus - Google Patents

Description

June 20, 1933. 5 L, HURD 1,914,744

BOILER CLEANING APPARATUS Filed April 25, 1932 Patented June 203, 1933 ITED ES PATENT QFFICE SYLVESTER L. HURD, OF NEW ORLEANS, LOUISIANA, ASSIGNOR OF ONE-THIRD T0 JOHN G. MILLER, SR., AND ONE-THIRD '10 JOHN G. MILLER, JR., BOTH OF NEW ORLEANS, LOUISIANA BOILER-CLEANING APPARATUS Application filed April 23,

The object of this invention is to provide a simple apparatus by the use of which scum and sediment may be easily removed from steam boilers of the fire-tube type. The 1nvention provides an apparatus which will utilize the principle of an ejector to withdraw from the water space of the boiler all of the scale, scum and other foreign matter. The invention is illustrated in the accompanying drawing and will be hereinafter fully described and defined.

In the drawing, Figure 1 is a view, partly .in elevation and partly in vertical section, of-

an apparatus embodying the invention,

Fig. 2 is an enlarged detail view, partly in elevation and partly in section, of one of the suction nozzles,

Fig. 3 is an enlarged plan view of the nozzle,

Fig. 4 is a detail perspective view of the nozzle.

The boiler, indicated in a more or less conventional manner at 1, may be of any well known or approved construction, the numeral 2 designating the fire tubes of the boiler and the normal water line or level being indicated at 3.

In carrying out the present invention, there is provided within the boiler, at such point as is deemed most desirable, a stand pipe 4. which is coupled at its lower end'to a sediment line or pipe 5, the coupling in the present drawing being a T-fitting 6 of known form. The upper end of the stand pipe is coupled to a scum or skimmer line 7 by a similar T-fitting 8, and the upper end of the T-fitting 8 is closed by a plug -9, as shown. The lower fitting 6 is secured in place by a coupling sleeve 10 which passes through the bottom of the boiler and is then coupled to a blow-ofl pipe 11 which is equipped with a cut-off valve 12 of any approved form. A steam pipe 13 is fitted through the stand pipe 4, concentrically therewith, and has its lower end disposed below the coupling sleeve 10 and immediately adjacent the blow-off pipe 11, the upper end of the steam pipe being disposed close to the top of the boiler and above the Water level, as will be understood. The sediment pipe 5 is secured at one end in 1932. Serial No. 607,169.

the fitting 6 and extends substantially the full length of the boiler. At intervals in the length of the pipe 5, T-fittings 14 are secured thereto and on the underside of these fittings are secured nipples or nozzles 15 through which the sediment is drawn from the boiler into the sediment pipe to be passed out through the blow-off pipe, as will be presently particularly set forth. The ski 7 is also provided with T-fittings 16 at intervals in its length and in the T-fittings 16 are secured skimmer nipples or nozzles 17 which are similar in construction to the nipples or nozzles 15, the upper nozzles 17 being appreciably longer than the lower nozzles 15 and preferably somewhat less in diameter. As shown most clearly in Figs. 2, 3 and 4, each nipple or nozzle consists of a cylindrical tube threaded at one end whereby it may be secured in the respective fitting 14 or 16, as the case may be, and provided with longitudinal slots 18 extending from points near the threaded end to and through-the opposite end. The slots 18 may be provided in any desired number but I show four slots and have found that number sufficient for efficient operation. The material of the tubummer pipe lar nozzle or nipple is bent inwardly at one side of each slot, as shown at comparatively Wide passage will be produced for the flow of scale or scum into the nipple and a whirling or eddying action will be set up within the nipple so that the foreign matter contained in the entering liquid will be prevented from adhering to the inner walls of the nipple and will be carried through the same into and through the respective pipes.

From the foregoing description, taken in connection with the accompanying drawing, it will be seen that I have provided an exceedingly simple device which may be easily installed in any boiler at a low cost and which will, in use, prove highly efl'icient. The cut-ofi valve 12 is normally closed and, consequently, there is no flow through the pipes 5 and 7 nor through the steam-ejecting pipe 13. When cleaning of the boiler is deemed desirable, the valve 12 is opened whereupon the steam in the steam space of 19, whereby a the boiler will at once enter and flow through the pipe 13, issuing from the discharge end thereof with considerable Velocity so that a partial vacuum will be created in the stand pipe 4 and the pipes 5 and 7 connected therewith. As a result of the formation of the vacuum, the sediment at the bottom of the boiler and the scum floating in or on the upper portion of the water will be drawn through the respective nipples 15 and 17 and through the respective pipes and discharged through the blow-off pipe 11, as will be understood. The action is certain and requires very little effort on the part of the attendant or operator and I have found that scale which tends to form upon or collect on the fire tubes will be drawn therefrom and carried out through the blow-off pipe. The installation of my cleaning apparatus does not alter the operation of the boiler in any way nor interfere with the usual uses thereof.

Having thus described the invention, I claim Apparatus for the purpose set forth comprising a stand pipe, a blow-elf pipe connected with the lower end of the stand pipe, a steam ejector pipe mounted axially in the stand pipe with its upper end projecting above the stand pipe and its lower end near the lower end of the stand pipe, sediment and scum collecting pipes connected respectively with the upper and lower ends of the stand pipes, and nipples mounted upon said collecting pipes at intervals in the length of the same, the nipples on the sediment-collecting pipe projecting downwardly and the nipples on the scum-collecting pipe projecting upwardly.

In testimony whereof I aflix my signature.

SYLVESTER L. HURD.

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