US1475718A - Blow-off plug for boilers - Google Patents

Description

Nw. 27,1923. 'y A iff-15,718

' s. orls ET AL BLOW-OFF PLUG AFOR BOILRS Filed Feb. 12. 1921 @muni lil il SPENCER CTS N 'WALTER GARDNER, Si? CHECAGO, ILLINOIS.

BLOl-GEE PLUG FR BGLERS.

Application filed February 12, 1921.

To el! uff/om may concern.'

Re it known that we, Simi-:cnn Uris and lli/lauren A. (flannivicn, citizens of the United States, residing at Chicago, in the county of Cool: and Satc olE illinois, have invented certain new and us ul improvements in Blow-@ft Plugs tor loilere, of which the following speciiication.

This invention relates 'to a plug to be inserted through the wall ot a boiler tor the purpose et blowing ofi the contents of the boiler in cleaning it, and has for its object to provide a blowoil;l plug which will serve not only to release the lluid contents of the boiler but also t@ introduce an air blast for stirring up the precipitate of the boiler as a step prelii'ninary tc or concurrent with the blowotl.

iccordingly, the invention consists in providing a plug of suitable construction to adapt it to be introduced through the wall of a boiler having controlled passages therethrough, adapted, respectively, ttor the outiioiv ot water and the injection ot air, the air passage being constructed at its inner end with a form that adapts it peculiarly to the c evelopinent ot violent ebullition in the Water 'of the boiler trom the air released thcreat. The control tor the water passage is manually actuated at will, while the control for the air passage. is preferably in the -form of a check valve, seating with the pressure within the boiler, and unseating to admit air from without when supplied under a suilicient head of pressure. y

ln the accompanying drawing- Figure l is a view ot portion of a locomotive boiler suggesting one use to which the subject-matter of the present invention may be put.

Figure 2 is a vertical longitudinal section through the plug in a plane which intersects its two passages; and

Figures 3 and 4 are, respectively, an outer end elevation and an inner end elevation of the same.

A represents the lire-box ot a boiler B of known construction. C represents a plurality of blowoif plugs embodying the subject-matter or the present invention. As shown in .Figure 2, the plug C is intended to be threaded into or otherwise tightly secured at C to the boiler plate B in position to permit its inner end to assume proper relation to the water to be stirred up and drawn oil'. ils suggested in Figure l, these plugs may be Serial No. 444,395.

arranged in suitable numbers along the mud ring ot the boiler, and may also be located over the crown sheet. t is to be understood that the length of the plug, and particularly that portion w rich extends within the boiler will bc varied according 'to the point beyond the inner tace of theboiler plate which it is desired to bring under immediate influence of the plug.

The plug C has a longitudinal passage C2 terminating in vertical passage C3, and a flaring discharge nozzle C4 through which air is introduced, said passage being guarded against back pressure from the boiler by means ot a cheek valve C5 which is guided in the screw plug C6 and made readily removable tor cleaning the valve. The plug further provided with'a passage C7 for" water which is controlled by a manually operated valve CS accessible from the outer side ot the boiler plate `B and which starts with the int-alie end C9 which is preferably closely related to the flaring air nozzle C4. The outer ends ot the passages C2 and C7 are adapted to receive pipes, hose fittings, or the like, through which to continue passageways for the elements that are to How through the passages, for instance, a hose connecting the blowoi passage C7 with the blowod pipe of a boiler washing system, and a lleXible connector uniting the passage C2 with a suit able source of air under heavy pressure.

An important feature of the preferred embodiment of the invention selected for illustration, is the particular section or form given to that portion of the plug which lies inwardly beyond the threaded portion C', and which is shown in Figure e. This portion of the plug is relatively narrow so that it offers a minimum resistance to the violent ebullition of the air released through the flaring nozzle C4 and permits the volume of air to rise violently through the water and develop the stirring effect desired.

Another important feature of a device of this kind and particularly of the air delivery passage, though not broadly of the present invention, consists in havingF a prolonged upwardly extending air trap between the discharge end and 'the air valve, provided in this .instance by the vertical leg C3 and inner portion of horizontal leg C2 of the air passage in which is trapped.v after shutting oil' the flow, a suiiicient body ot air to exclude boiler water from the air valve and thereby protect the valve from corrosion,

CII

1We claim:

l. A combined air blast and water blowoff plug for steam boilers having controlled passages for air and water therethrough, communicating independently with the interior of the boiler and adapted respectively to 'deliver air thereto and withdraw water therefrom.

2. A combined air blast and water blowoff plug for steam boilers having controlled passages for air and water therethrough independently communicating with the interior olf the boiler; the air passage of said plug terminating in a downwardly presented flaring nozzle.

3. A combined air `blast and water blowoff plug for steam boilers having controlled passages for air and water therethrough; the air passage including a downwardly eX- tending portion; and the water passage communicating with the interior of the boiler adjacent the inner end of the air passage.

Al. A combined air blast and water blewol" plug for steam boilers having passages for air and water therethrough communicating independently with the interior of the boiler; said water passage having a inanually controlled valve; and said air passage having an independently acting valve.

5. In combination with a steam boiler, a

combined blowol and agitating plug fixed in the wall or' the boiler and having controlled independent air and water passages therethrough establishing communication between the interior of the boiler and the exterior thereof and adapted respectively to deliver air into the boiler and release water therefrom.

G. In combination with the mud ring or" a steam boiler, a combined air stirring and liquid blowoff plug introduced through the wall of the boiler, and having air and fluid passages therethrough independently connnuneating with the interior of the boiler adjacent the mud ring and adapted respectively to release air into and withdraw water Yfrom the boiler. Y

7. A combined air stirring and liquid blowol plug adapted to be introduced into the wall of a boiler, having valved passages for air and bloworl'l products; the air passage being in the upper part of the plu and communicating with the boiler thro downwardly extending leg, and its valve being located in an upper portion of the passage.

8. A blasting plug for boilers having a horizontally extending air passage with a downwardly extending discharge leg, and a cheek valve in said passage located in the horizontal part thereof remote from its j unction with the downwardly extending discharge leg.

Signed at Chicago, Illinois, this 10th day of February, 1921.

SPENCER OTIS. VALTER A. GARDNER.

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