US82239A - Improvement in dbop-tube steam-geneeatoes - Google Patents

Description

@uiten "tutes gutem @ffice JOSEPII NASON, OF NEW YORK, N. YJ, ASSIGNOR TO HIMSELF, CHARLES H JAMES, AND FRANK MILLWARD, OF CINCINNATI, OHIO.

Leiters Patent No. 82,239, dated September 15, 1.868.

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TO ALL WI-IOM IT MAY CONCERN:

De it known that I, JOSEPH NASON, of the city and county of New York, in the State of New York.; have invented certain new and useful Improvements in Drop-Tube Boilers; and I do hereby declare that the following is a full and exact description thereof.

The object of my invention is to provide more elfectually than heretofore against any conflict of the ascending and descending currents, at or near the top of the drop-tubes, and to provide for taking the water into the internal tubes from the spaces between the tops of the main` tubes, where the water is preserved, as far 'as possible, from any disturbance due to the ebullition'in the main tubes.

I will rst describe what I consider the be'st means of carrying out my invention, and will afterwards designate, the points which -I believe to be new.

The accompanying drawings form a part of this specification.

Figure lis a section on a small scale.

Figures 2 and 3 are sections on a scale about half size, showing two forms of the details.

Figure l shows a third form. i.

The figures show the novel parts, with so much of the other4 parts as lappearsnecessary to show their rela.- tions thereto.

Similar letters of reference indicate like parts in all the gures. Tints are employed mainly to a'id in distingnishing parts, and do not necessarily indicate materials.

A is thecrown-shect or Hue-sheet, which extends horizontally over a space, in which the gaseous matter from the fire circulates, and which supports above it a stratum of waterfC, as represented. D are the drop,- tubes, open at theii` upper ends, and elosedlatvtheir lower` ends. These tubes are Screwed into the tube-sheet A, so as to form a strong and tight connection therewith.

I employ an internal tube, d, which is open both at. the top and the bottom, and through which wateriis allowed to descend, t`o furnish va current, which may rise as it becomes heated, and becomes filled with particles of steam, thus inducing a double current, one descending` through the interior tube d, and the other ascending on its exterior, and between it and the main tube D.

This general idea of circulating water in this manner'm drop-tubes has been long known and approved, and my invention relates to details of the construction, which remain tobe described.

Referring to iig. 2, the outer tube D is extended upward above the tube-sheet A. by adding-a length, D', which may be made of cast iron.- It is open at both ends, and is, or may be, a plain tube, with the exception lthat there is a bent piece of internal pipe east therewith, as indicated b y d', which, when the top is secured upon the maintube, forms a connection with the internal tube 0l. I

The figures represent several modifications of the details. l

Fig. l shows the general arrangement of this part of the boiler on a small scale. I do not deem it necessary to represent the other portions of the boiler, as they may be arranged in any approved manner.

Fig. l represents the top piece Dl as threaded in its interior, and fitting upon male threads upon the top of the main tube D.

Fig. -L represents thetop pi'ece as tting within the top of the main tube D. allows the main tube to be introduced, as usual, through the furnace or space B, and allows the top piece to be conveniently and permanently applied before the introduction of the tube to its place in the tube-sheet A.

. Figures 3 and-5 represent another modification, in which the top piece is in one with the main tube. In this modification, the internal tube d is fastened to the external tube,- or extended top, by cutting and bending outward a portion of the internal tube, so as to form lips, which connect it with sucient force and tightness. It will be readily seen that the connection, withrthe internal tube el, of the external tube D need not be perfectly water-tight. Lu thisvform of the invention, the upper end of the internal'tubed may be closed by This latter arrangement any convenient means, so that the water shall enter solely throughgthe aperture provided in 'the side ofthe extended top.

I have tested my invention very thoroughly, and with highly-satisfaittoryresults.- The steam generatedin the drop-tube rises, taking with it a current of water, and pours out in a continuous stream at the open top, while the-internal tube d draws from the space between the tops of the tubes a. current of-water, which is nearly free from particles of steam. I take care to' so arrange my tubes in the boiler that there shall be suicient space between the tubes D for the water to collect and remain tranquil, and I prefer to so construct the boiler that there shall be a space of two or three inches between the exterior tubes and the outer shell ofY the boiler, as indicated in iig. 1,- from which a current of water may flow inward through the spaces.

The extended top D', with the connected part d', may be conveniently and cheaply made of cast iron` They may be cast as thin as the metal will flow, they being subject to no strain of any importance. The internal tube a7, is made a little smaller than the lower end of the portion d', and is'simply thrust into its place. The lower end ofthe .interior tube d may rest upon the bottom of the main drop-tube D, the internal tube being cut at an angle, as represented, tovallow an amp-le space forA the water to ow out at the bottom.

Having now fully described my invention, what-I claim as new, and desire to secureby Letters Patent, is

as follows: l

1. I claim the within-described extension of the drop-tube upward above the upper surface of the tubesheet A, 'and the provision for allowing a current of water to enter through the side of such extension, and descend through an enclosed passage or tube, d, combined and arranged substantially as and for the purpose herein set forth.

2. I claim, ,in connection with the above, making the extended'top D in a separate piece from the main drop-'tube D, and adapted to serve, relatively to the other parts, substantially in the manner and for the purposes herein spcied. n

JOSEPH NASON.

Witnesses:

C. C'. LrvrNes, `W; C. DEY.

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