US374039A

US374039A - Draft-regulator

Info

Publication number: US374039A
Authority: US
Publication date: 1887-11-29
Anticipated expiration: 1904-11-29

Description

S. E. BURKE.

DRAFT REGULATOR.

(No Model.)

No. 374,039. Patented Nov. 29, 1887.

UNITED STATES PATENT STEPHEN E. BURKE, OF EDON, OHIO.

DRA FT-REGULATO R.

SPECIFICATION forming part of Letters Patent No. 374,039, dated November 29, 1887.

Application filed August 14, 1887. Serial No. 247,743. I (No model.)

. citizen of the United States, residing at Edon,

in the county of Williams and State of Ohio,

have invented certain new and useful Improvements in Tubular Boilers; and I do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon,which form a part of this specification.

My invention relates to draft-regulators for tubular boilers, and has for its object to control the draft through the tubes, so-that the same may be shut off at will and thus prevent the cooling of the tubes'aud subsequent cutting down of the steam when the furnace-door is opened for the purpose of poking the fire or introducing fresh fuel; and to the accomplishment of the above ends the invention consists in the application to the tubes of a damper, which may be constructed and combined as hereinafter described and Claimed and operated either by hand or automatically by connection with the furnacedoor, aswill hereinaiter more fully appear, reference being had to the accompanying drawings, forming a part hereof.

Figure 1 is a side view of a portion of a tubular boiler with parts in section, showing the application of my invention. Fig. 2 is an end sectional view on the line 00 w of Fig. 1. Fig. 3 is a perspective view showing manner of connecting damper and door.

In the drawings, the letter A designates so much of a tubular boiler as will illustrate the application of the invention, the tubes 13 being represented as opening into the smoke-box G. In front of the tubes B,within the smoke-box, is swung a damper, D. This damper is swung so that when moved back from the tubes it is moved bodily back and away from the tubesheet, thus leaving practically the same distance or space between the tube-sheet and damper, and in that respect differing from a damper whose point of suspension is fixed, so far as moving the whole damper bodily from the tube-sheet is concerned. One advantage of moving the whole'damper bodily and directly away from the tubes or longitudinally I with t-helength thereof is that it is applied to or removed from all the tubes practically at the same time, and a practically uniform space is left in front of the tubes, whereby a better circulation is obtained and less space may be required for the operation of the damper, and, further, the space and its uniformity between the damper and tubes can be more easily regulated and made. The damper is swung so as to hang perpendicularly, or practically so, when moved back by suitable means, say, for instance, by an arched or crank-supporting cross-rod, E, whose ends or axles are suitably journaled along the sides of the boiler, to whose upper part is connected the damper above its center .of gravity, so that it will hang vertically, the damper being connected thereto so as to swing thereon, say, by collars or sleeves F, which encircle the suspending-rod and are connected to the damper. This suspendingrod is connected to a crank, G, say, on the outside of the boiler, and to whichis joined a rod, H, which extends to the front of the boiler within easy reach of the engineer or fireman, and whichis moved by means of a lever, I, fulcrumed at some suitable point and designed to engage with a rack-bar, J, which will hold it at any desired point of adjustment, so that the damper will'be held closed or stand at the desired distance from the tubes.

A spring, K, may be employed to press the operating-lever against the rack.

Instead of operating the damper by hand, it may be operated automatically by connecting the rodH to the furnace-door L, say, by means of a crank-lever, M, fulcrumcd ate, and connected at one end by the link N to the door, while the other end is connected to the rodH. In such case the rack J may be omitted. The rod H may pass through a guide lug or car secured to the side of the boiler. Under such construction,when the furnace-door is opened the damper is automatically and simultaneously drawn up against the tubes, so as to cut off all draft through the same and thus prevent cold air being drawn into the tubes.

The distance between the damper and the tube-sheet or tubes is in proportion to the width of the opening in the door.

On the inner face of the damper,next to the tube-sheet, is formed a flange, P, which will keep the damper from striking the tubes and at the same time form a closejoint between the tube-sheet and damper. The damper is also formed with perforations Q for the passage of smoke. These perforations,while permitting the escape of smoke, do not interfere with the action of the damper. The damper can be applied to either stationary or portable boilers, or to boilers of any form or description having tubes which it may be desirable to close while feeding fresh fuel or poking the fire.

The damper not only holds the heat when the boiler is out of use, but also when in use, and, besides, cuts off the draft of cold air through the tubes when the door is open, and thus preventing the cooling of the tubes and cutting down of the steam. It may also be used to regulate the draft through the tubes; and when not in use to shut off the draft it stands back from the tubes, so as not to obstruct the draft.

I have shown and described what I consider to be the best construction and arrangement of parts to effect the results; but still I do not wish to be understood as limiting myself to such details, as it is obvious that changes can be made therein withoutdeparting from the spirit of my invention.

The damper D may have any desired number of lugs or fingers It on its face, so that when thrown back in the position shown by dotted lines in Fig. l the lugs will bear against the door or end wall of the smoke-box and prevent the damper from swinging or wabbling.

Having described my invention and set forth its merits, what I claim is- 1. In a tubular boiler, the combination,with

- the tubes thereof, of a damper suspended across said damper, substantially as described.

2. In a tubular boiler, the combination,with the tubes thereof, of a damper supported to move in front of the tubes and a flange between the damper and tube'sheet to prevent contact between the damper and sheet and form a joint, substantially as described.

3. In a tubular boiler, the combination, with the tubes thereof, of a damper provided with perforations for the escape of smoke, and supported to move in front of the tubes to regulate the draft through the tubes, substantially as described.

t. In a tubular boiler, the combination, with thctubes thereof and the furnace-door, of a damper supported to move in front of the tubes and connected with said door, whereby it will be automatically operated with the opening and closing of said door, substantially as dc scribed.

5. In a tubular boiler, the combination, with the tubes thereof, of a damper swung, substantially as described, in front of the tubes to move back and forth, and fingers or lugs on one face thereof to strike against a bearing to steady the damper, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

STEPHEN E. BURKE.

YVit-nesses:

C. A. BOURSOX, R. L. STARR.