US418818A - Device for creating draft - Google Patents

Description

(No Madel.) 1 4 sheets-sheet 1. C. H. SGHARAR.

DEVICE POR GREATING DRAFT.

No. 418,818. Patented Jan. 7, 1890.

(No Model.)

G. H. SCHARAR. DEVICE EOE CREATING DEAE'E.

No. 418,818. Y Patented Ja.11.7, 1890,

(No Model.) 4 Sheets-Sheet 3.

C. H. SGHARAR.

DEVICE FOR CREATING DRAFT. Y

No. 418,818. Patented Jan. 7.1890.

NA PETERS PholLMwgnphef, Wnlhinglcn. D. C.

(NovModel.) whew-sheet 4.

. C. H.- SGHARARl nvmr: PoR CREATING DRAFT.

Patented 10.418,818. Jan. 7,1890.

i PATENT OFFICE.

CHRISTIAN H. SCHARAR, .OF SCRANTON, PENNSYLVANIA.

DEVICE FOR CRATlNG DRAFT.

SPECIFICATION forming part of Letters Fatent No. 418,818, dated January 7, 189C.

ASerial No. 814,500. (No model.)

able others skilled in the art to which it apper? tains to make and use the same. i

My invention relates t an improvement in devices for increasing draft. V The object is to provide simple and effective means, more particularly adapted to use in connection with steam-generating furnaces,

` whereby a draft of great force may be formed through linea: o@ of Fig. 3.

at pleasure with the loss or expenditureof a minimum amount of steamforce.

Vith these ends in View myinvention consists in certain features of construction and combinations of parts, as will behereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 represents alongitudinal vertical section of a steam-boiler furnace, showing my draft device in connection therewith. Fig. 2 is a plan view of the same. Fig. 3 :is an enlarged vertical transverse section of the draft-increasing device in position at the base yof the smoke-stack, and Fig. 4 is a horizontal section Figs. 5, 6, 7, and S represent, respectively, longitudinal verti# cal section, plan, enlarged horizontal section, and enlarged vertical section of a modified arrangement of the draft device.`

A represents the boiler. In the present instance I yhave represented twin horizontal boilers set upon suitable supports B, through which the products of combustion from the furnace C pass to the uptake or smoke-stack D.

In Figs; l, 2, 3, and 4 my draft-forcing device is represented as located at the base of lthe smoke-stack. The device ,consists of a group (inthe present nstancefour are shown) of tubes E, contracted from their base'upwardly, through which the products of combustion are obliged to pass to escape. This group of contractedpassages is provided around the walls of each passage, below the more contracted portion of the passage, with several openings leading from without the tubes E upwardly through the walls of the tubes to the interior thereof. the letter e, and their slant is such as to cause the steam issuing therethrough to tend to focus a short distance abovethe more con` tracted end of the tube. The group of contracted tubes E is surrounded by a casing F, completely inclosing the side walls of the group and forming a chamber or steam-space G, encircling the sides of each one of the tubes of the group. The chamber or steam-space G is connect-ed with the steamspace of the boiler by a pipe H, provided with a suitable stopcock h for regulating the supply of steam. vA return or waste pipe I, provided with a stop-cock t', is also connected with the lower portion of the steam-space G, for the purpose of removing water of condensation from the space. with nozzles or expanding-tubes K, projecting upwardly from their more contracted portions, and preferablyr enlarged as they extend upwardly, forming a reverse taper relatively to the tubes E.

These openings are represented by- The contracted tubes E are provided The effect of the above arrangement is as follows: The steam from theboiler admitted into the space surrounding the tubes E becomes superheated, because of its contact with the highly-heated walls of the tubes through which the products of combustion pass, and issues through the small openings e within the tubes E with great force,produc ing a vacuum or partial vacuum within the tubes beneath the issuing jets, which the gases passing along the Hue beneath the boiler rush to iill, and, together with the steam, are carried out of the nozzles K and up the smoke-stack. By arranging the several tubes E of the group around the axis of the uptake or smoke-stack, and by arranging the several passages or small openings e around the axis of the tubes E, the several jets have a tendency to fill-the nozzles with a rapid upward current, and these several currents combined to fill the uptake and prevent any tendency to downward side currents, which are liable in many instances to vinterfere with an effective draft.

As a matter of simplicity of construction, the casing F and the' group of contracted tubes E may be formed in a single casting,

IOO

and the nozzles K may be bolted to the oasincr F in position over the contracted ends of the tubes.

In Figs. 5, G, 7, and 8 I have represented the group of Contracted tubes with their nozzles arranged horizontally and in a line and located in one of the transverse supportingwalls beneath the boiler,in the path of the Hue leading from the furnaee to the uptake. The principle upon whioh they operate is, however, the same in this arrangement as in that hereinbefore described, and it is evident that said tubes might be grouped in many other well known or approved forms and loeated at other positions in the draft-flue without departing,` from the spirit and seope of my invention. It is further to be ,noted that the chamber or steam-space G may be itself a steam-generati ng chamber, and that the steam generated therein issuing` from the nozzles, will, as before explained, produce the forced drafts.

Having thus fully described my invention, what I olaim as new, and desire to seeure b5 Letters Patent, is

l. In combination, a `srroup of contracted tubes located in the draft-line, asteam-spaee surrounding the group of eontraeted tubes, flaring nozzles fitted to the tubes, the oontraeted tubes being provided with oblique openings extending` through-their walls, and a connection leading from the surrounding steam-space to the steam-supply, substantially as set forth.

2. A group of tubes E, provided with nozzles or expanding-tubes K, said tubes E being contracted from their base upwardly and provided around the walls of each passage below the Contracted portions with openings, easing F, surrounding the tubes forming steam-space, the same being connected with the steam-space of the boiler by pipe lI,a return or waste pipe I, connected with the steam-space G, for the purpose of removings,r water of condensation from the space, substantially as shown.

In testimony whereof I have signed this specification in the presence of two subscribing` witnesses.

CHRISTIAN Il. SCHARAR.

\Vitnesses:

W. L. LAWRENCE, W. E. ANDERSON.

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