US724272A - Draft device. - Google Patents

Description

P-ATBNTED MAR. 31, 1903'.

' :r. v. ELLIOTT.

DRAFT DEVICE.

APPLICATION FILED JULY 3, 1902.

no MODEL,

' INVENTOR Hacienda VEZZZOZfi ATTUH/VfYS.

WITNESSES.

UNITED STATES ATYENT mm."

TIIADIOUS VENSON ELLIOTT, OF COLUMBIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO JOHN B. HUTCHINSON, OF COLUMBIA, PENNSYL- VAN IA.

DRAFT DEVICE.

SPECIFICATION forming part of Letters Patent No. 724=,272, dated March 31, 1903.

Application filed July 3,1902. Serial No. 114,221. (No model.)

To aZZ whom it may concern:

Be it known that I, THADIOUS VENsoN EL- LIOTT, a citizen of the United States, and a resident of Columbia, in the county of Lancaster and State of Pennsylvania, have made certain new and useful Improvements in Draft Devices, of which the following is a specification.

My invention is an improved draft device for furnace-stacks; and it consists in certain novelconstructions and combinations of parts, as will be hereinafter described and claimed. In the drawings, Figure l isa longitudinal section of a furnace, showing the device as in use. Fig. 2 is a detail vertical longitudinal section of the nozzle. Fig. 3 is a detail perspective view showing the series of expansion-chambers and the nozzle, and Fig. 4: is a detail section enlarged.

By my invention I provide in the stack of the furnace a draft device consisting of a series of concentric sections in connection with a nozzle discharging into the lowermost section, each of the concentric sections being slightly larger than the preceding one and the lower or receiving end of each section being flared slightly outward and the upper or discharge end of each section being flared slightly outward and the outwardly-flared end of each section fitting within the outwardly-flared end of the next-succeeding section, so each section will discharge freely to the succeeding section and the flare at the lower end of each succeeding section will permit the entrance of a limited amount of air, smoke, or other contents of the stack, as may be desired.

By my invention I discharge into the lower end of the series of sections, which gradually enlarge, steam and air in such manner as to produce a blast or forced draft, which will expand successively in the several sections and will operate by compound expansion to produce a strong upward draft within the stack, the smoke, gases, steam, &c., in each section of the device discharging into and expanding within the larger succeeding section, as will be understood from Figs. 1 and 3 of the drawings.

In the construction shown the draft device includes a series of sections 1, 2, 3, and at, the

upper end of each section being flared outwardly at 5, and projecting slightly within the lower end of the next upper section, which lower end is flared outwardly at 6, and the nozzle B discharges into the lower section 1, which section is of less diameter than the succeeding section 2, which in turn is smaller than the section 3, and so on to the end of the series, the device involving,-as.shown, four sections; but manifestly the number may be varied as desired. In supporting the draft devices in the stack 0, I prefer to provide arms D, connected at their inner ends with the upper section 4 and at their outer ends to the stack, and to provide the sections 2, 3, and4 with straps E, extending below their lower ends and entering boxes F on the next lower section, wherein they may be socured by clamping-screws f in any desired adjustment. By this construction the sections may be adjusted into any desired relation and secured in such relation, as may be desired.

The nozzle B discharges at its upper end B into the lower section 1 and may be supported from section 1 .by the stgap G, secured adj ustably to the nozzle B at G, as shown in Fig. 2. This nozzle has a chamber H at its lower end, into which steam is discharged at H under control of the pin-valve H air being admitted at H to the chamber to mix with the steam, the steam operating to draw the air, smoke, 850., into the nozzle and force the same out of the upper end of the nozzle, where the latter is provided with a spreader I, which may include a central inverted cone 1 and bars 1*, connecting such cone with the body of the nozzle. Steam is supplied through the pipe J, leading from the dome of the boiler.

By the use of the described construction a strong upward draft will be caused in the stack 0, which may be regulated by proper adjustment of the valve H and where desired a valve K may be provided to throttle or control the discharge of steam through the pipe J.

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

1. The combination substantially as herein described with the furnace-stack of the draft device supported therein and consisting of an upright series of tubular sections, each section being larger than the next lower section and provided on said sections with loops or boxes and with straps extending from the next upper section and adjustably secured in said loops or boxes, straps connecting the upper section with the stack, the nozzle discharging into the lower section and the upper and lower ends of the adjacent sections being flared outwardly substantially as set forth.

2. A draft device for furnace-stacks comprising a series of concentric tubular sections arranged in succession, each section being larger than the preceding section and the discharge end of each section and the receiving end of the succeeding section being flared outwardly, substantially as set forth.

3. A draft device comprising a plurality of I succeeding sections, the discharge end of one section being flared outwardly and pro3ect- 4. In a draft device the combination of a series of sections in which each section is provided at its receiving end with projecting straps and the preceding sections are provided with means for adj ustably securing said straps whereby the sections are secured together substantially as set forth.

5. A draft device comprising a series of tubular concentric sections succeeding each other and in which each section is larger than the preceding section and the receiving end of each section and the discharge end of the preceding section are flared outwardly substantially as set forth.

THADIOUS VENSON ELLIOTT.

Witnesses:

J. B. HUTOHINSON, JAMES R. PEARCE.

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