US1079266A - Preheater and furnace-shield. - Google Patents

Description

W. S. ROCKWELL PREHEATER AND FURNAGE SHIELD.

APPLIOATION FILED AUG.15, 1913.

Patented Nov. 18, 1913.

3 SHEETS-SHEET 1.

muy. 1.

W. S. ROCKWELL.

PREHEATER AND FURNACE smu). APPLIGATION FILED AUG.15,1913. 1,079,266. Patented Nov. 18, 1913.

3 SHEETS-SHEBT 2.

WALTER S. ROCKWELL, OF NEW YORKAN. Y.

PREHEATER AND FURNACE-SHIELD.

Speeification of Letters Patent.

Patented Nov. 18, 1913.

Application filed August 15, 1913. Serial No. ?84,912.

To all whom it may conce 'n Be it known that I, WALTER S. RocwnLL, a citizen of thetUnited States, residlng at 300 West One Hundred and Sixth Street,

New York, county of New York, and State of New York, have invented certain new and useful Improvements in Preheaters and Furnace-Shields, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The 'present invention relates to that class of furnaces used in heating metal for various purposes, as in forging, welding, bending, annealing, hardening, tempering, and other Operations. Such furnaces have a heating chamber heated by suitable fuel, and provided with a so-called working-opening through which the metal to be heated is introduced and removed, and such workingopening is left open and used as the outlet for all or a part of the Waste gases, when the metal is in bars which project through the opening during the heating operation, as in making beats upon the ends of rods for heading bolts, welding, &0. Such working-opening cannot be provided with a door where the bars project outwardly therefrom during the heating operation, and the fiaming gases which escape at such opening necessarly create a very high temperature around the opening and cause great discomfort to the'operator who handles the heated bars.

One object of the present invention is to utilize the waste heat of the escaping gsses to heat the air which is used in the conbustion of the fuel and thus heat tl'e chamber with less Consumption of fuel; and another object of the invention is to combine with the preheater for the air a shield to protect the operator in great part from the heat of the waste-gases, where they escape from the working-opening.

To protect the operator, shields of various kinds have been employed adjacent to the working-opening to intercept the heat rays; but the present invention provides an attachment for the front of a heating' furnace which not only intercepts the beat, but deflects the hot gases into direct contact with air-conduits which deliver the heated air to the fuel.

lVhere coal rr coke is used as the tuel, the heated air is delivered thereto to promote the combustion; but where liquid or gaseous fuel is used, the heated air is discharged wholly or in part through the fuel-burners to mingle with the fuel as it enters the furnace-chamber.

Sometimes where short portions of bars are to be heated, it is common to locate such fuel-bvrners beneath the level of the bars; but where long bars are to be heated they re uire the support of the chamber-fl oor, an the burners are located above such floor; but the operation of the preheated air is the same in either case, to producethe required temperature with less Consumption of fuel.

A typical form of the invention, for use adjacent to the wm-kin -opening of the furnace, consists of a shie fd which is combined with air-conduits in such a manner as to form a casing which is supported upon the furnace front just above the furnace opening and through which the waste-gases may be conducted.

The air is preferably conducted in a tortuous path through the preheater, to keep the air longer under the heating influence, and a series of transverse pipes is therefore employed which are connected at their opposite ends respectively by suitableheaders.

(last iron headers may be used, to the outer sidcs of which a shicld can be attached which, with the h aders, forms a complete inclosure or casing for the conduit-pipes, when fitted to the furnacc-front.

A blast-pipe is preferably provided at the bottom of the casing, directing an air-cun, rent toward the cscaping gascs to obstruct their flow toward the operator and compel them to move upwardly through the casing.

By attaching the headers to the furnace front the casing is wholly closed and operates to hold the waste-gases close to the surfaces of the conduits so as to hoat the latter most efi'ectively.

The series of pipes is somewhat inclined to the vertical so that the hot gas may strike all the transverse pipes successively as it rises to escape from the top of the casing.

The series of condits is connected at one end to an air-supply-pipe, and at the' other end to one or more delivcry-pipes for conducting the'heated air into contact with the burning fuel. WVith such Construction, the lower horizontal pipe of the conduits is provided with perforations upon its lower side 110 and the invention is not theretore limited to the precise Construction shown in the drawing, but includes any such appliance 'providng a downward blast upon the escapng gases to arrest their outward movement; the conbination of a preheater and inclosig casing with the wall of the furnace wherevethe vaste-gases escape, and the combination with a working-openin forming a gas-outlet, of a shield combine with a preheater to protect the operator froni the waste-gases while utilizing their heat to heat the air for combustion.

Having thus set forth the nature of the invention what is claimed herein is:

1. An attachment for metal-heating furnaces, comprisin a preheater and' shield consisting of airieating pipes with connections for the supply and deliver of air, a non-conducting plate at one si e of such pipes and Secured thereto, and means for supporting the preheater' and shield upon the outside of the furnace.

2. An attachment for metal-heating furnaces, comprising a preheater and shield consisting of a plurality of pipes connected together at their ends and provided with inlet and outlet for air, a plate attached to such pipes and provided With a layer of nonconducting material to form a shield, and means' for supporting the preheater and shield upon the outside of the furnace.

3. An attachment for metal-heating furnaces, comprising a preheater and shield consisting of a plurahty of arallel pipes,

headers connected respectively to the opposite ends of such pipes and provided with inlet and outlet for air, a plate attached to the headers and provided with a layer of non-conducting material to form a shield, and means for supporting'the headers upon the outside of the furnace.

4. The combination, with a metal heating furnace having a heating chamber with an outlet for the waste gases, ofa casing of non-heat-conducting material supported adjacent to such outlet with the waste gases conducted therethrough, and air conduits in the casn in the path of the heated gases, such conc uits having inlet with connection to an air-blower and outlet delivering the heated air to the fuel during the combustion of the same.

5. In a metal heating furnace, the combination, with a furnace-front having a heating-chamber with working-opening in such front from which the waste gascs may escape, of a shield of non-hoat conducting material supported adjacent to the furnacefront above such working-opening, with a vertical passageway between such shield and front through which the waste gases may travel, and an air-blast-pipe supported above the said opening at the bottom of the passageway, and directing an air-blast upon the gases escaping from the said opening and Operating to deflect them into said passageway.

6. In a metal-heating furnace, the combinatiom with a furnace-t'ront and a heating-chamber, with working-opening in such front from which the waste gascs may escape, of 'a shield of non-heat-conducting material supported adja'cent to the front above said opening, forming a casin adjacent to such opening through whic the waste gases may travel, connected air-conduits in such casing with outlet deliverin the heated air to the fuel of the furnace, an with inlet connected to a pipe supplying air under pressure.-

7.'In a metal-heating furnace, thecombination, with a furnace-front and a heating-chamber with working-opening in such front from which the waste* gases may 35 escape, of a shield of non-heat-conducting material supported adjacent to the front above said opening, formng a casin adjacent to such opening through whic' the waste gascs may travel, connected air-conduits in such casing with outlet delivering the heated air to the fuel of the furnace, the bottom Conduit being perforated a'nd the air-blast therefrom directed against the waste gases to defiect them from the operator into the said casing, an air-supply-pipe connected to the Conduit, and a valve in such supply-ppe controllin the supply of air to the blast-pipe, the con( uits, and the fuel.

8. In a metal-heating furnace, the combination, with a heating-chamber provided with fluid-fuel-burners and having a working-opening at the front ermitting the escape of waste gases theref om, of a preheatcr casing above such opening, and ai'- conduits therein connected to the fuel-burners and supplying heated air thereto.

9. In a metal-heating turnace, the combination, with a heating chamber provided with lud-fuel-burners and having a working-opening at the front ermtting the escape of waste gases there rom, of a preheater casing above such opening, with horizontal air-conduits arranged in an inclined series therein transverse to the movement of the gases, and snpplying heated air to the fuel-burners.

10. In a. metal-heating furnace, the conbination, with a heating-chambcr provided with fluid-:fuel-burners and having a working-opening at the front permitting the escape ot' waste gases thei-ofroni, of a preheater casing above such opening with a non-leat-conducting shield upon its outer side, and air-conduits therein connected to 1 the 'fucl-burners and supplying heated air thereto.

11. lu a metal-heating furnace, the combination, with a-hcating-chamber provided With fiuid-fuel-burners and having a work- 0

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