USRE6750E - Improvement in rotary steam-boilers - Google Patents

Description

., C. W. PIERCE.

ROTARY STEAM-BOILER.

NJUERS. FNOTO LITHOGRAFHER WASHINGTON. u 0.

N0, 5,750, -Reissued Nov. 16, 1875.-

IMPROVEMENT IN ROTARY STEAM-BOILERS.

Specification forming part of Letters Patent No. 166,807, dated August 17, 1875; reissue No. 6,750, dated November lfi, 1875; application filed October 9, 1875.

To all whom it may concern:

Be it known that 1, CHARLES W. PIERCE, of New York, in the county of New York and State of New York, have invented new and valuable Improvements in Steam-Boilers and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawing is a representation of a longitudinal vertical section of my boiler, and Fig. 2 is a transverse vertical sectional view thereof.

This invention has relation to rotary tubular steam-boilers; and the nature of my inven tion and improvement on this class of boilers consist ininserting tubes G, buckets b, flues H, annular flange g, and annular chamber h, as hereinafter described.

In the annexed drawings, A designates the furnace-chamber, 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 0, 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 equidistant apart, within and concentrically around the axis of the boiler-shell. These dues are near the boiler-shell, and extend the whole length and through both the heads of the a boiler.

They are open at the outward surface of the boiler-heads, and throughout their whole length, and admit the flame and products of combustion to pass freely through them while the boiler is rotating. Each one of these flues is nearly encircled by a bucket, b, as shown in Fig. 2. These buckets 12 extend from one end to the other of the flues G, and

'are attached to 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 water-line in the boiler, supply the water to the flues 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 flues Gr, extend from one head to the other of the boiler, and pass through'and are open at the outward surface of both, and are concentrically arranged around the shaft E, as shown in Fig. 2. v

At one end of the boiler there is an annular flange, g, formed on the interior of the furnace-wall, which flange surrounds a chamber leading into the chimney A. At the oppo-' site 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 flues 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 there must 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.

What I claim as new, and desire to secure by Letters Patent, is r 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 g and chamber h, whereby the products of combustion are caused to pass through the outer series and return through the inner series, as specified. I

2. Buckets I), in combinationv with the in,- ner surface of the boiler-shell to supply water to the flues G and shell D during that part of the revolution performed above the waterline.

dfihulafi fla fi'fe 'halilbel 'h, ""I n 'testihiehy tihat I eleifil the' a bgve'I-have combination with the tubes G and H, suhstam hereunto subscribed my name in the presence tially as and for the purpose set forth. of two witnesses. v 4, The combination of the shell D, buckets CHARLES W. PIERCE. b, flues G and H, chamber h, flange g, and I Witnesses:

chimney A; constructed "and' operating sub 7 A. D. DAVIS,

stantially as and for the purpose specified. SAML. W. TUTTLE.

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