US1576020A - Hot-air furnace - Google Patents

Description

March 9 1926.

INVENTOR ATTORNEY Patented Mar. 9, T9255.

UNT-D STATES 'laila-@2d i FRANK Z. AHL. 0F SACRAMENTO, CALIFORNIA.

Application filed G'ctober 29, 1924. Serial No. 746,550.

To .'ZZ whom it may concern Be it known that l, FRANK Z. Ann, a citizen ot the United States, residing at Sacramento, county or" Sacramento, State ot California, have invented certain new and use-p iiful Improvements in Hot-Air Furnaces; and I do declare the following to be a full,` c`ear, and exact description of the same. reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part ot this application.

This invention relates to improvements in heat furnaces et the natural draft hot air supplying type, and particularly to one. using gas or similar tucl.

The principal object. of my invention .is to construct a furnace oi: this characters() that a very large heated surface against which the air comes in contact will be provided in proportion to the size ot the furnace and the amount ot fuel consumed.`

Another object is to arrange suitable air intake and outlet baille or deilector means in such a manner that a large amount ot the incoming air to be heated will trst be deflected to pass adjacent the hottest surface ot' the furnace betere passing out through the distributing pipes. At the same time the air circulating past the less heated surface will be prevented from too quickly escaping' from the furnace, thereby insuring that such air will be well heated by the time it passes.

out from said furnace. Nevertheless 'the passage of the air from the intalz'eto the outlet is not obstructed sui'iiciently to hinder the proper amount of draft from being created and automatically maintained with the operationoi2 .the furnace.

A further object is to provide simple means Jr'or preventing any moisture of condensation of gas in the discharge flue from draining back into the 'furnace itself.

A further object of theinvention is to produce a simple. and inexpensive device and yet one which will be exceedingly effective tor the purpose tor which it is designed.

These objects l'. accomplish by means of such structure and relative arrangement of parts as will 'fully appear by a perusal of the following specitication and claims.

In the drawings similar characters of reterence indicate corresponding parts in the several views:

Fig. 1 is a sectional elevation ot thefur- 118C@- Fig. 2 is a `sectional plan on the line 2-2 n of Fig. 1. y Referring vnow more particularly tothe characters of reference on the drawings, the numeral 1 denotes a cylindrical shell supported from the ground or floor and'having on its upper end a truste conical cap '2. Air outlets 3, from which distrlbuting pipes lead to the various rooms to be heated, project from the sides of the cap, the top ot which is concave in the form ot an inverted cone, as at 4.

Mounted centrally in the shell and closed both at top and bottom is the main lire chamber 5, at the lower end of 'which is located an upwardly facing gas or other suitable burner 6, the necessary air for which obtained from apassage 7 leading from said chamber to the outside of the shell.

Surrounding` the chamber 5 and concentric therewith is a drum S extending to the top. of said chamber but terminating short ofthe bottomthereof and' of 'the bottom or the shell. The inner periphery ot this drum is spaced a suitable distance :trom the chamber to leave the air passage 9 open from the shell below thechamber tothe cap 2 thereabove.V Air from youtside the shell is -admitted tofthis passage through a side opening 10 therein belowthe chamber The outer periphery oif the drum deeply7 corrugated from top to bottom as shown lat 11,'thereby greatlyincreasing the surface area of this drum over what lwould be the case if the drum were painly cylindrical. The bottoms of these corrugations'are spaced a suitable distance from the inner periphery of the drum, while the outer edgesthereot are similarly7 spaced from the shell.

The drum is closed at top and bottom eX- cept for passages 12 adjacent the top thereof leading from the top ot the chamber 5, and an outlet 13 at the bottom ofthe drum onthe side thereof opposite to the passages 12. This outlet 13 connects witha discharge pipe or flue lfl preferably placed between two adjacent. eorrugations 11 and extending to the top thereof. At this point said flue joins on to a horizont-al portion '15 which passes through the shell, the lower side ot' this horizontal portion having a downward slant. away from the flue 14, as shown at 1G. Since this horizontal flue, away from the direct heat, is the portion in which condensation is most liable to form, it will b e seen that owing to its downward slantany moisllO tureftherein will run in a direction away 'troni the Hue lll and not into the saine.` y

Depending inwardly fron'i the shell adjacent the lower end of theV drinn and at a downward angle is an air detlecting ring 17 having a central opening concentric with the chamber This causes air entering the shell through the side opening l0 to be deflected toward the center ot the furnace,

anl causes the majority ot the air to pass up through the passage 9 between the highly heated surta es of the drinn and chamber. This air on passing up clear ot the drum strikes the cone -t and is deflected toward the outlets o.

Projecting mmuuy from t'lie shell il" about the top of the drum is a horizontal.

detlectingring: l8,ei\jtending across the space l) between the shell and the drum, and inwardly from said space extending upward ly substantially pa 'allel to the sides ot the cap 2, as shown at 20. This causes the air passing up between the shell and the drinn to be somewhat retarded during such passage, insuring thatthe air willbe well heated j l and forcing the same toward the center of lill `without any relatively cool currents.

The shell cap and outlets, although not so shown in the drawings, will of course be covered with asbestos or similar heat retaining means, as is customary in the industry.

As is customary `in hot air furnaces,- a water vessel Q1, vopen at the top, is mounted in the' shell l just above the intakeflue 7,

and extending across the air passage 19, to keep the an" moist. This vessel projects to the outside ol' the shell,` so that it may j be readily filled, the exterior portion* being closed by a removable cover 22.

Frein the foregoing.description it will be readily seen `that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

lVhile this specification'sets forth in dctail` the present and preferred construction of thedevice, still in practice such deviations `troni 'sncli detail may be` resorted to as do not torni a departurey from the spirit ot the invention, as defined by the appendedclaims. j j

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is: j

l. ln a hot air furnace havinga vertical shell, a drum therein spaced from the shell, airintake means below the `drum where# by ail-may pass upwardly between the shell and drum, means for heating the drum, and a cap on the shell having openings inits sides; an air detlecting ring in the shell above the drum, saidring coinj'irising a horiT zontal portion extending from the shell to a point inwardly of thev outer peripheryotI the druni above but close to the latter, and a tapering portion extending upwardly and inwardly at an acute angle from the inner end et said horizontal portion` Q. In a hot auturnace havinga vertical shell, a drum therein spacedfroni the shellV andprovided with a` central opening, from end to end, airlintake means below` the drinn whereby. air may pass upwardly either through theV central openinger between the drum andslielhineans for heating the drum and a cap on the shell; air detlecting means Vin the shell below the drum but above the tu re. v

FRANK Z. AHL.

Images