US1182863A - Fan for induced draft. - Google Patents

Description

H, TOUSSAINT.

FAN FOR INDUCED DRAFT.

APPLICATION nuso JAN-25,1916.

Patented May 9, 1916.

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l/VVE/VTOR 701/584 INT WITNESSES H. TOUSSAINT.

FAN FOR INDUCED DRAFT.

. APPLICATION FILED JAN-25,1916- L1%,63 Patented May 9,1916.

3 SHEETSSHEET 2- WITNESSES. INVENTOR' l/El/t/R/Cl/ muss/4 m/ T H. TOUSSAINT.

FAN FOR INDUCED DRAFT.

APPLICATION FILED JAN. 25. I916.

Patented May 9, 1916.

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FAN FOR INDUCED DRAFT.

Specification of Letters Patent.

' Application filed January 25, 1916. Serial No. 74,097.

To all whom it may concern:

Be it known that I, HEINRICH TOUssAIN'r, a subject of the German Emperor, King of Prussia, residing at Cassel-Wrlhelmshtihe, Germany, have invented certain new and useful Improvements in Fans for Induced Draft, of whichthe following is a spec1fica tion.

My invention relates to rotatable fans, for induced draft, when placed in the lower part of a chimney or stack and operated so as to force the fire gases upwardly thereln.

'Fans placed in the lower part of a chimney or stack, as above mentioned, are not new. Such arrangements, however, have not been entirely satisfactory, owing to the fact that the fan bearings have been exposed, to a greater or less extent, to the intensely hot flue gases; and it has long been recognized that, to avoid the intense heat thereby produced, said bearings should be I removed as far as possible from the 1nflu-- ence of such gases. In prior arrangements, of which I have knowledge, this object has only been partially attained, inasmuch as it has only been possible to locate the lower or thrust bearing out of the stream of hot gases while leaving the upper or neck bearing exposed thereto.

It is the object of the present invention to improve the just described and hitherto used arrangement by not only removing both bearings from the stream of hot flue gases, but by, furthermore, providing means to actually cool 'the neck hearing by flowing thereover a stream of cold air. This requirement of a stream ofcold air flowing over the neck bearing is almost as essential as that the neck hearing be removed from the stream of flue gases, inasmuch as the neck bearing is, in any case, substantially nearer the fan than the thrust bearing and is consequently affected by the heat of the said gases in much greater degree. Over and beyond this, a great deal of heat, from.

the region of the fan, reaches the neck bearing by conduction through the fan shaft.

My invention will be better understood by referring to the accompanying drawings,

in -which Figure 1 represents one form of my invention as applied to the chimney of, a sta tionary steam plant, the chimney being shown in section; Figs. 2 and 3 represent, respectively, front-and side elevations of a modified form of my invention as applied to a marine boiler plant; and Figs. 1 and 1 show, respectively and on an enlarged scale, axial sections through the neck bearmg and the thrust bearing.

Referring to Fig. 1, a fan b is located near the bottom of a chimney b, and fixed to a shaft 0 which is mounted to rotate in a frame 0?, having a neck bearing d and a thrust bearing d The frame 03 is supported by brackets g, g and provided with a downwardly extended portion 7 carrying a motor 6, (electric or other preferred suitable type) the shaft of which is directly connected at n to the shaft 0. The frame w1th its bearings is situated, as may be seen by the drawing, in a chamber 6 opening from, or recessed into, the bottom of the chimney. This chamber is covered by a plate 6 and is also provided with a lateral opening having a door It. The plate 11 base central opening is through which projects the upper part of the frame 05, with the neck bearing d, and from this opening is extended a tapered air conduit sleeve Z which is spaced from but surrounds the projecting portion of the frame and that portion of shaft 0 above the frame and reaches substantially to the fan I). The door it, when opened, gives access to the fan, its mounting and motor, as a whole for purposes of cleaning, lubrication, repair and the like; and the door is so arranged that, even when closed, a certain amount of cold air, from outside the chimney, may pass therethrough.

In operation, the rotation of the fan forces the hot flue gases upwardly, thereby establishing the desired induced draft and preventing said gases, and any ashes which they may have carried from the fire box, from entering the top of the air conduit Z so as to heat shaft 0 and neck bearing 03. Furthermore, the cold air which enters chamber 6 through door h, will be sucked upwardly by the fan so as to establish a continuously flowing stream through air conduit Z, which stream will tend to cool the neck bearing d" and the shaft 0 and, hence,

-to lessen the amount of heat which can be carried from the fan to the neck bearing by conduction through the shaft 0.

- In the modified form ofmy invention intended for marine boilers, as shown in Figs. 2 and 3, the stack in which the fan is placed is formed by the junction of the individual exit flues, g and r, of a pair of similar boilers o and 1) arranged side by side in the usual way. The frame d, carrying the neck and thrust bearings d and d, and the driving motor e (shown as'a steam turbine in this case), is supported in the chamber or space i, formed and laterally bounded by the flues g and 1', as they unite to form the main stack. The air conduit or sleeve 1 extends upwardly from an opening made in the upper central part of this chamber.

The fan proper may be cleaned through an opening '0, made in the wall of the stack at the level of the fan and ordinarily cov ered by a suitable door.

Having described my invention I claim:

1. In combination with a vertical stack, a

' bottom for said stack provided with an opening which connects with an air supply and from which extends an upwardly directed air conduit, a rotatable fan in said for said shaft provided with a neck and thrust bearing and located in the'space below the stack which is bounded by the inner Walls of the exit flues, there being an opening connecting said stack and said space through which said shaft passes and through which air may flow upwardly over the shaft.

In testimony whereof I have hereunto set my hand.

HEINRICH TOUSSAINT.

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