US624401A

US624401A - Annealing-furnace

Info

Publication number: US624401A
Authority: US
Publication date: 1899-05-02
Anticipated expiration: 1916-05-02

Description

Patented May 2, I899. W. & J. C. SWINDELL.

ANNEALING FURNACE. (A aplication filgd N v. 10, 1898.)

'2 Sheets-Sheet I.

(No Model.)

"wagons,

.. WASHINGYDN D c N0. 624,40I. Patented May 2, I899.

W. &. J36. SWINDELL. v

'ANNEALING'FUBNAGE.

(Application filed. Nov. 10, 1898.) (No Model.) 2 Sheets-Sheet 2.

JaMW Y A M l E1177, Att

m: NORRIS wzrcas co, mmauma. wiswmm'cm 0. cv

- UNITED STATES PATENT. OFFICE.

WILLIAM SWINDELL AND JOHN C. SWINDELL, OF PITTSBURG,

- PENNSYLVANIA.

ANNEALlNG-FURNACE.

SPECIFICATION forming part of Letters Patent'No. 624,401, dated May 2, 1899. A li ati filed November 10, 1898. Serial No. 696,022. (No model.)

To all whmn it mag/concern.-

Be it known that we, W LLIAM SWINDELL and JOHN C. SWINDELL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a oertainnew and useful Improvement in Annealing-Furnaces, of which improvement the following is a specification. a

Our invention relates more particularly to furnaces of the class designed to receive and impart heat to annealing-boxes containing sheets, plates, or other articles which are to be annealed; and its object is to provide a furnace of such class in which a uniform degree of heat may be imparted to the annealingboxes and an economical consumption of gaseous fuel be attained.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a vertical transverse section through an annealing-furnace embodying our invention, taken at the line to w of Fig. 3; Fig. 2, a lougitudinal section through the lower portion of the same at the line m a: of Fig. 4; and Figs. 3 and 4, horizontal sections through the same at the lines y y and z 2, respectively, of Fig. 1.

In the practice'of our invention We construct a furnace having an annealing-chamber 1, which is preferably square or rectangular in horizontal section, above its floor 2 and a series of gas and air'fiues below the floor. The annealing-chamber is inclosed by and between the floor 2, an arched top or roof 3,.side walls 4, and end walls 5, openings 6, closed by doors 7, being formed in one of the end walls for the insertion and removal of the annealing-boxes and their contents. The required degree of heat is imparted to the annealing-boxes in the chamber 1' by the combustion of a mixture of gas and heated air, which is supplied to the chamber through a series of flues located below the floor and supply-passages formed in the side walls and connecting therewith, the essential features of which flues and passages are as follows:

Longitudinal gas-supply flues 8 8 are formed in the masonry of the lower portion of the furnace, each of said flues extending throughoutthe length of the furnace below the floor of the annealing-chamber and adjacent to one of the side walls. Pipes9 9 lead from a suitable gas-producer to the gas-supply flues S 8, the flue on each side of the furnace communicating at one end with one of said pipes and the supply of gas therefrom being controlled by a'suitable valve 10.. The gas-flues 8 communicate with the annealing-chamber 1 by a plurality of vertical gas-supply passages 11,.

which are formed on the inner s ides of the side walls 4 and open into the annealingchamber a short distance above the floor.

Two transverse air-admission flues 12 12, (see dotted lines, Fig. 3,) the outer open ends of which may be provided with proper valves or doors, extend from the sides of the furnace toward its center below the gas-supply flues 8 and adjacent to the end of the furnace at which the pipes 9,leadin g from the producers, are located. Longitudinal air-supply and heating flues-13 communicate at one end with the air-admission fines 12, as shown in Fig. 1, and lead therefrom to or nearly to the opposite end of the furnace, where they communicate through ports 13 Figs. 1 and 4, with superposed longitudinal air-supply and heating flues 14. The flues l4 communicate, through ducts 14, Figs. 1, 2, and 4, with a plurality of vertical air-supply passages 15, which are formed on the inner sides of the side walls 4, each being located adjacent to one of the gas-supply passages 11 and opening into the annealing-chamber on or nearly on a level therewith.

A central waste or discharge flue 16 extends longitudinally through the furnace below the floor and communicates with the annealingchamber by a plurality of discharge-passages 17. The flue 16 is connected at one end by transverse passages or connecting-flues 18 with two lateral waste'or discharge flues 19,

which extend through the furnace and, passing'ou't of the opposite end thereof, are led into a common stack 20. Each of the flues 19 is provided with a damper 21, governing communication with the stack 20.

The-air-supply and waste flues are so located relatively one to the other that the heat of the products of combustion passing from the annealing-chamber to the stack 20 shall be imparted as fully as possible to the currents of air passing to the annealing-chamber through the

flues

13 and 14.

.fiue 13 is located on each side of the central To this end a waste-flue 16 and on each side of each of the lateral waste-flues 19. The air-flues 14 are each located immediately above one of the lateral Waste-flues 19 and immediately under and in contact with the floor of the combusrounded on three sides by air-hues and that there are air-flues on two opposite sides of the central waste-flue 16, while the air-flue 14, through which the air passes just prior to its entrance to the combustion-chamber, is between the highly-heated floor of the latter and the waste-flue 19.

Access to the gas-flues 8 is afforded byopenings 22, controlled by doors 23, and the air-flues may also be provided with suitable opemngs and doors.

one-half of the furnace shown.

In the operation of the furnace gas from the producer passes from the pipes 9 into the flues 8 and thence into the annealing-chamher 1 by the passages 11, which distribute it throughout the length of the chamber. Air

- enters at the open ends of the ad mission-flues 2 and thence passes in divided currents through the fines 13, from which it passes through the flues 14 and is thence distributed throughout the length of the chamber by the passages 15, each of which is in close proximity to a gas-passage 11. The gas and air meet and are mingled at the outlets of the

passages

15 and 11, and the mixture is ignited and burns thereat, the heat evolved being exerted with substantial uniformity throughout the annealing-chamber. The hot products of combustion pass from the annealing-chamber by the discharge-passages 17 into the waste-flue 16, and thence pass through the connecting-flues 18 and lateral flues 19 to the stack 20. In their passage through the

flues

16 and 19 their heat is imparted to the walls thereof and thence to the currents of air passing through the

flues

13 and 14; to the annealing-chamber. The heat of the waste gases is thus effectually utilized before their escape into the stack.

We claim as our invention and desire to secure by Letters Patent I 1. In a furnace, the combination of a com-' bustion-chamber, a gas-supply flue extending longitudinally below the floor thereof, a plurality of gas-supply passages leading from the gas-supply flue into the combu stion-charnber, an air-supply flue extending longitudinally below and in contact with the floor of the combustion-chamber so as to be heated thereby,

a plurality of air-supply passages leading from the air-supply flue into the combustionchamber, and a waste-flue leading out of and extending below the floor of the combustionchamber and adjoining the air-supply fiue.

2. In a furnace, the combination of a combustion-chamber, a gas-su pply flue extending longitudinally below the floor thereof whereby it is heated, a plurality of gas-supply passages leading fromthe gas-supply flue into the combustion-chamber, a waste-flue leading out of and extending below the .floor of the combustion-chamber, air-supply flues extending longitudinally below and in contact with the floor of the combustion-chamber whereby they are heated, and adjoining opposite sides of the waste-hue whereby they are turther heated, and a plurality of air-supply passages leading from the air-supply flues into the combustion-chamber.

3. In a furnace, the combination of a combustion-chamber, a gas-supply flue, a plu rality of gas-supply passages leading from the gas-supply flue into the comb ustion-chamber, a waste-tlue leading out of and extending below the floor of the combustion-chamber, airsupply flues extending longitudinally below the floor of the combustion-chamber, and adjoining opposite sides of the waste-flue, an airsupply flue in contact with the floor of the combustion-chamberwherebyit is heated and communicating at one end with said air-supply flues and adjoining a third side of the waste-flue, and a plurality of air-supply passages leading therefrom into the combustionchamber, each adjacent to the outlet of one of the gas-supply passages.

at. In a furnace, the combination of a combustion-chamber, gas-supply flues extending below the floor and adjacent to opposite sides thereof, a plurality of gas-supply passages leading from the gas-supply flues into the combustion-chamber, a central waste-flue leading out of and extending below the floor of the combustion chamber, lateral waste flues, each leading independently from the central wasteflue, air-s upply fi ues extending longitudinally below the floor of the combustion-chamber and adjoining opposite sides of the central and lateral waste-flues, and a plurality of air-supply passages leading from the air-supply flues into the combustion-chamber, each adjacent to the outlet of one of the gas-supply passages.

WVM. SWINDELL. JOHN C. SWVINDELL.

Witnesses:

J. SNowDEN BELL, O. A. WILLIAMS.

IIO