USRE7184E - Improvement in rotary steam-boilers - Google Patents

Description

c. w. PIERCE. ROTARY STEAM BOILER. No. 7,184.. Reissued June 20, 1876.

WITNESSES INVENTIII ('6 I mom a N. PETERS, PHOTO-LITHOGRAPHER, WASHINGTON. D C

UNITED STATES- PATENT OFFIcE CHARLES W. PIERCE, OF NEW YORK, N. Y., ASSIGNOR TO THE PIERCE ROTARY TUBULAR BOILER COMPANY, OF SAME PLACE.

IMPROVEMENT IN ROTARY STEAM-BOILERS.

Specification forming part of Letters Patent No. 166,807, dated August 17, 1875; reissue No. 6,750, dated November 16, 1875 reissue No. 7,184, dated June 20, 1876; application filed May 1, 1876.

. have invented a new and Improved Rotary Steam-Boiler, of which the following is a specification In the aecompanying drawing, Figure 1 represents a longitudinal vertical section of my improved boiler, and Fig. 2 is a transverse vertical sectional view thereof.

The invention consists in certain novel features of construction and arrangement, by which a rotary steam-boiler may be improved, as hereinafter particularly described.

In the annexed drawings, A designates the furnacechambcr, which in form is rectangular; B the grate-bars, and O the ash-pit. D designates the boiler-shell, which is cylindrical and of any suitable length and diameter. Through the center of this boiler passes a tubular shaft, E, which is supported by antifriction rollers a to outside of the furnacechamber, and which has a spur-wheel, F, keyed to one end, that receives rotation from any convenient prime mover. G G designate a number of flue-tubes, which are arranged equdistant apart, within and concentrically around the axis of the boiler-shell.

These lines are near the boiler-shell, and

the inner side of the cylindrical shell of the boiler.

When the boiler is rotated the buckets b will successively take up the water, and, during that part of the revolution which is performed above the waterline in the boiler, supply the Water to the lines and to the boilershell, thereby preventing undue or unequal expansion thereof, and greatly facilitating the generating of steam.

Inside of the circle of tubes or fines G is another circle of tubes H, which, like the lines Gr, extend from one head to the other of the boiler, and pass through and are open at the outward surface or both, and are concentrically arranged around the shaft E, as

nace-wall, which flange surrounds a chamber 5 leading into the chimney A. At the opposite end of the boiler an annular chamber, h, is formed in the furnace-wall, which chamber is of the same diameter as the boiler, and communicates with the open ends of the tubes or flues G and H.

It will be seen that the flame and results of combustion will first pass through the lines G into the chamber h, and then return. through the flues H into the chimney A.

From the rotation of the boiler, and the current of heated air passing through the dues, it is obvious they are self-cleaning, and, from a similar cause, no sediment can collect and remain on the inner surface to corrode the shell of the boiler.

By these features of construction and operation economy and efliciency are combined in a high degree.

It is obvious that theremust be a passage or passages between the hollow trunnions and the interior of the boiler for the admission of water and the escape of steam.

Having thus described my invention, what I claim as newfand desire to secure by Letters Patent, is-

1. Two sets of tubes or flues passing through the heads of the boiler and concentric with each other, in combination with the annular flange 9 and chamber h, whereby the products of combustion are caused to pass through the outer series and return through the inner series, substantially as herein shown and described.

2. The annular flange g and chamber h, in combination with the tubes G-and H, substantinlly as herein shown and described.

3. The combination of the shell D, buckets b, flues G and H, chamber h, flange g, and chimney A, constructed and operating substantially as herein shown and described.

CHARLES W. PIERCE. Witnesses:

T. B. Mosnnn, ALEX. F. ROBERTS.

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