US2579325A - Hot gas agitator for heaters - Google Patents

Description

HOT GAS AGITATOR FOR HEATERS Filed June 25, 1947 2 SPEETS-SHEET l m ll ' INVENTOR. PAL PH A. Kmuss ATTORNEY Dec. 18, 1951 R. A. KRAUSS 2,579,325

HOT GAS AGITATOR FOR HEATERS Filed June 25, 1947 2 SHEETS-SHEET 2 INVENTOR. 7mm 4. mm U55 ATTORNEY Patented Dec. 18, 1 951 UNITED STATES PATENT OFFICE HOT GAS AGITATOR FOR HEATERS Ralph Anthony Krauss, Philadelphia, Pa., as-

signor to Anthracite Equipment Corporation, Wilkes-Barre, Pa., a corporation of Delaware Application June 2 5, 1947, Serial No. 756,987 ,4 Claims. (01.110-97) The present invention relates to heaters and more'particularly to a device for increasing the efficiency of boilers and heaters.

' 'An object of the invention is to provide means for securing greater heat absorption per unit of heating surface. An important feature of the invention in that connection is the provision of a device which impels the hot gases from the furnace fire bed along the heat absorbing-walls of the furnace; thereby obtaining marked increase in the absorption of heat by said walls, and greatly increasing the furnace efiiciency without the addition of large areas of heating surface.

The invention, more specifically, provides a fan or agitator which is arranged to draw hot gases from the fire bed and to force them along heat-absorbing furnace walls. The fan or agitator may be so arranged as to impel the gases repeatedly and at high velocity against the same surface areas of a heater as are exposed in the conventional heater to gases which impinge thereon only once and'at relatively low velocity. It may effect repeated circulation of the hot gases in the combustion chamber at high velocity, thereby contributing still further toincrease of heat output without change of dimensions of either heater or chimney.

Other features and advantages of the invention will be hereinafter described and claimed.

In the accompanying drawings Fig. 1 represents a sectional elevation of a heating apparatus embodying the present invention; Fig. 2 represents a perspectiveof the'form of agitator shown in Fig. 1; Fig. 3 represents a sectional elevation of a heater equipped with another form of agitator; Fig; 4 represents a perspective of the agitator shownin Fig. 3; and Fig. 5 represents a detail in bottom, plan of the agitator shown 3.

Referring to the drawings one. form of the present invention is shown in Fig. 1 as including a chamber I 0 of a boiler or heater I I of any well known type for heating Water or air as the case may be. Asshown, the heater II is of thecoal fired type having a coaling door l2 opening to the chamber in above a grate l3, and also having a gas outlet I4 leading to the flue or chimney. The heater walls, as shown, maybe hollow to provide a jacket adapted to contain water or other suitable fiuidmedium to be heated.

It will be' noted that in this embodiment the lower wall portion of the chamber [0 surrounds a fire bed on the grate I3; while the upper wall portion extends beyond said fire bed. The inner surfaces of said upper wall portion thus absorb heat from the combustion gases emerging from said bed and transfer said heat to the water or other fluid medium in the surrounding jacket.

For creating turbulence of the gases within the combustion chamber [0 in order to project the combustion gase violently against the heatjecting end of the shaft sleeve I1 is anchored by,

attachment to the horizontal arm 22 of a wall bracket 23, while the shaft l6 passes through an opening 24 provided in the arm 22.

For driving the shaft I6 at a selected speed the motion transmitting means, shown by way of example, includes a pulley 25 fast on the shaft l6 and driven by a belt 26 from a second pulley 21 keyed or otherwise made fast to the shaft 28 of an electric motor 30. This latter is carried by the bracket 23. The speed for best results can be obtained by variation of pulley diameters as well understood.

Preferably the impeller I5 is located well within the dome I8 and above the ga outlet [4 but the invention is not limited to this precise assembly since advantageous results may be obtained-by positioning the impeller in closer proximity to the fuel bed.

In the form of the invention shown in Figs. 3 and 4 an impeller of fan wheel type is shown attached to the shaft 16 to receive rotary motion therefrom. In this type the impeller is formed by two spaced circular plates 3| and 32 having vanes 33 around the periphery and connecting the marginal rims of the two plates 3| and 32. The plate 32 is provided with an axial opening 34 so that gases are drawn inward and projected radially outward by the vane structure to produce the desired gas circulation or turbulence. Preferably this type of impeller or agitator is provided with a cylindrical bailie 35 of slightly larger diameter than the impeller and mounted coaxially below the inlet plate 32, being suspended from Thus when sult, maximum heat absorption is maintained,

and the heating surfaces of the boiler may be materially reduced. A substanital amount of heat units, which heretofore have-been lost in the ber in communication with said fire bed chamber for receiving combustion gases from said bed and transferring heat from said gases to a fluid medium, said apparatus also having an opening for the escape of said gases from the second mentioned wall portion, a device comprising rotary blades extending substantially entirely out of alignment with said opening for causing said gases to impinge repeatedly and at increased velocity against the inner surfaces of said second mentioned wall portion, and means forming a positive drive connected with said rotary blades.

3. In combination, heatin apparatus having a wall portion-defining a chamber for a fire bed, and also havinga wall portion rigid with the firstmentioned wall portion and extending beyond the chimney or flue, now become available and useful. Also, for a given stack draft condition the rate of combustion is materially increased.

In both forms of impellers used the rotative speed is preferably'such that the impeller will handle several times the amount of gas given.

oil by the fuel bed, so that the gases arev forced to' circulate in a closed path several times before passing to the chimney.

While in the foregoing the surfaces against which the gases impinge at high velocity are illustrated as those in the combustion chamber, the invention, in its broader aspects, is not limited theretosince many heaters have not only these combustion-chamber heating surfaces but also supplemental heating surfaces in chambers through which the gases travel after leaving the combustion chamber. Broadly, therefore, the invention includes apparatus for impelling the hot gases at high velocity against heat absorbing surfaces whether in the combustion chamber or in chambers supplemental thereto.

The terms and expressions which I have .employed are used as terms of description and .not of limitation, and I have no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof, but recognize that various modifications are possible within the scope of the invention claimed.

I claim:

.1. In combination, locatingv apparatus having'a wall portion defining a chamber for a fire bed,-

and also having a wall portion rigid with the first-mentioned wall portion and extendin beyond the same to provide aheat-absorbing:chamber in communication with said fire bedchamber for receiving combustion gases from said bed and transferring .heat from said gases to a fluid medium, said apparatus also having an opening for-the escape of said gases from the second mentioned wall portion, a device comprising rotary blades extending substantially entirely out of alignment with said opening for causing said gases to recirculate along inner surfaces of said second mentioned wall portion, and means forming a positive drive connected with said rotary blades.

2. In combination, heating apparatus'having a wall portion defining. a chamber for a fire bed,

and also having a wall portion rigid with the first-mentioned wall portion and extending beyond the same to provide a heat-absorbingcham---" same to provide .a heat-absorbing chamber in communication with said fire bed chamber for receiving combustion gases from said bed and transferring heat from. said gases to a fiuid medium, said-apparatus also having an opening for. the escape of said'gases from the second mentioned wall portion, an impeller comprising blades extending substantially entirely out of alignment withsaidopening for causing a flow of gases longitudinally within the second men-.

tioned wall portion toward said openin and along the inner surfaces'oflsaidzseoond mentioned wall portion, and positive-means for'rotatingsaid impeller.

4. In arhea-ting apparatus the combination. of a. heating unit. including a fire bed chamber, a heat absorbingchamber rigid withv said fire bed chamber 'andin communication therewithfor receiving combustion gases from said firebed chamber.

and: surrounding heating surfaces, a. fiueoutlet, for products. of combustion, means to admit fuel.

into said. fire bed chamber, means comprising rotary blades extendingsubstantiallyentirely-out' of line" with said outlet to cause said products .of

combustion toimpinge more. than once .uponsaid heating surface, whereby available heat units normally escapin to said flue outlet are utilized in the heating of. said surfaces, and :means form! ing a positive drive connected with said rotary blades.

RALPH ANTHONY KRAUSS.

REFERENCES CITED The following references are of record in the file of'this patent:

UNITED STATES PATENTS Number Name Date 7 75,429 Kellogg Mar. 10, 1868 373,030 Steel NOV. 8, 1.887. 742,339 Lyons Oct. .27, 1903. 1,123,526' Hanson Jan. 5, 1915 1,611,913 Inch Feb. 23, 1926.. 1,623,746 Murray Apr. 5,1927 1,938,241 Banfield Dec. .5, .1933 2,197,495 Faulds Apr. 16, 11940.1 2,224,544 Keller Dec. 10, 1940-1 .FOREIGNPATENTS Number Country Date i 1,396 Great Britain Dec. '6, 1859 244,374 Germany Mar. 10, 1912; 222,656 Great-Britain Sept. 19'. 1924'"

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