US2012037A

US2012037A - Automatic air control

Info

Publication number: US2012037A
Application number: US566251A
Authority: US
Inventors: Walter H Drew
Original assignee: CLEVELAND STEEL PRODUCTS COMPA
Current assignee: CLEVELAND STEEL PRODUCTS Co; CLEVELAND STEEL PRODUCTS COMPA
Priority date: 1931-10-01
Filing date: 1931-10-01
Publication date: 1935-08-20
Anticipated expiration: 1952-08-20

Description

Aug. 20, 1935. w. HDREW 2,012,037

AUTOMATIC AIR CONTROL Filed oct. 1, 1951 llllll Illllll INVENTOR #MM WVJ/ 25 are,y attained. With the above and'other objects in view, which Patented Aug. 20,31935 y UNITED STA-TES- BATENT AOFFICE 2,012,037 l AUTQMATIC Ant CONTROL Walter HDDrew, Cleveland, Ohio, assignor to The Cleveland Steel Products Company, Cleveland, hio,.a corporation 'of Ohio 'Application october 1, 1931, serial No. 566,251 l 1 oranti.. .(01. 15a-m This invention relates to oil burning vfurnaizes and more particularly to the, fuel distributing units therefor andthe means for supplying'iair. for mixture with the fuel. I .5 i O ne of the objects of the present invention is to provide a compact fuel distributing` unit of 1 new and improved'construction. Another object is to provide a fuel distributing unit having a new and improved means for regulatlng and adjusting `the flow of air therethrough, that assists in atomizirig the fuel dis-l tributed thereby. y f c Another objectis to provide an oil burning furnace in which the supply-of air thereto is vauto- 15, matically controlled.

. -Another object is to provide an-oil burning furnace in which the supply of air thereto is automatically decreased after the initial ignition period.

A further Objectis to provide an'oil burning furnace in which a large supply of air is ad mitted ther/ete during the initial ignition period and in which the'supply, of air is automatically decreased after :adequate combustion conditions -will be apparent from the following detailed' description,. the present invention may be said to consist in certain features of construction and combinations of part's which will be readily understood by those in the art towhich the invention appertains. i a

. In the-drawing which illustrates a. suitable embodiment of the invention, 85 Fig. 1 is a fragmentary vertical section of a furnace andoil distributing device with .which the control of the present invention is incorporated;

Fig. 2 is a plan View of the furnace interior;

4t0 ythe air controldevice being shown in broken outline; an'd i Fig. 3 is a section taken approximately on line 3-3 of Fig. 2. Referring to the accompanying drawing, in .which like numerals refer to like parts throughout the several views. the furnace I is provided with a transverse hearth 2 of refractory material near the bottom thereof and an. endless hearth ring 3 lmounted on the hearth 2 adjacent the,

furnace wall.

, to the disc I4 for rotatingthe same.

is supported bythe housing 4 below 'the lower end thereof. A distributing head 8 is mounted within the housing 4 and is'secured to the upper end of` the shaft I.A The head 8 is provided with a plurality of upwardly and outwardly extending 5 radial distributing tubes 9. These tubes 9 are in\ communication with the hollow shaftv 'I and terv inmate immediately above the upperedgeof the housing 4 and slightly inwardly of the periphery thereof as shown inFig'.- l A" fan member I0 is i secured to the head 8 and s provided with, blades the hollow shaft 'I and thenceoutwardly'through the distributing tubes. The'fan member draws air from below the hearth through the housing 2Q .4, Where the samemixes with the fuel discharged throughthe tubes 9.-- The atomized fuel is discharged against-the hearth ring 3 and is ignited, thereby providing a continuous flame around the 'hearth ring.

In order to regulate the amount of air flowing through the `housing 4 to obtain satisfactory combustion, a shutter arrangement is provided. As shown in the drawing, the housing 4 is formed with an integral ange IZeXtending radially in- 30 "wardly thereof and having a plurality of regularly spaced openings I3 therein. These openings are arranged to be closed by 'a rotatable annular disc".|4 likewise having openings -I5 therein,'ar

ranged at times to register with the openings I3 .35

and permit unrestricted ow of air'therethiough. By rotatingthe disc I4, the openings I3 can be partially or completely closed to permit the propersupply of air. A suitable lever I6 is secured The disc I4 40 is supported from the flange I2 b'ya sleeve I1 surrounding the distributing head and threaded into the flange I2. The sleeve I 'I is formed with an Kcoutwardly extending radial angel which engages the lower surface of the annular` disc I4 4 to support the same. i g i In the operation of oil Yburning furnaces it has been found that considerable time elapses .before the proper and desired heating flame is obtained.

=-. This is due to the fact that the supply of air adel quate for the proper combustion of the fuel when the interior of the'furnace is at the desired heating temperature isnot adequate for'rapid .rise to this temperature. As a result considerable time elapses, when the furnace -is cold, fromthe time of initial ignition until the desired heating temperature is obtained within the furnace.

The present'invention has to do with means for automatically. admitting a supply of air to the furnace, during the initial fuel ignition period, which is greater than the lsupply necessary when the furnace is operating at the proper heating temperature, 'and for shutting off this additional supply when the interior of the furnace reaches a predetermined temperature.

In order to positively control the air and provide for an automatic increase or decrease of the air supply in accordance with the temperature prevailing within the combustion chamber, I provide a means whereby the disc I4 is thermostatically operated by means of a heat responsive unit. Although otherv types of heat responsive units may be employed, the type here shown lends itself to convenient use of the rotatable air control disc I4. chamberv25, and is mounted in the hearth 2 with a thin wall exposed to the heat within the furnace. The chamber 25 is in communication with an expansible-contractible bellows member 2E that is suspended by a bracket 21 from the lower side of the hearth. One end of the bellows member 26 is connected through a universal member, such as a ball and socket joint 28, with the operating lever I6 of the disc I4. The movable end. .of the bellows 26 is guided by the bracket 21 and a compression spring 29 may be interposed between the bracket and the movable end to as sist in the contraction of the bellows 26.l The bellows and chamber 25 maybe filled with a volatile vfluid or.heat responsive fluid, so that when the temperature within the furnace increases the bellows member 26 will cause the disc AIll to gradually shut off the supply of air flowing through the inletopenings controlled thereby. This device is adjusted so that when the bellows member 26 is contracted, such as when the furnace is in inoperative condition, the air supply openings are wide open to permit a maximum supply of air during the initial ignition and starting period. By using the chamber 25, heat responsive means is provided which'can be mounted in the hearth without interrupting the continuity of the hearth surface. It is clearly obvious that other types of heat re- This unit comprises an enclosed sponsive means may be employed to equal advantage.

In the construction shown and described, a means of supplying additional air over and above the amount necessary for normal operation is provided, which is automatically controlled by the temperature of the furnace, and which will automatically shut oi the supply of' additional air when the furnace temperature reaches a predetermined value but which will automatically permit an increase in air supply when the 'temperaJ ture falls below the said predetermined value.

It is to be understood that the air vcontrol` means shown and described in connection with Figs. 1, A2 and 3 may be used to equal advantage in furnaces using fuel distributing means ,other than the rotary device shown.

The advantages of the air control means described and shown in the drawing are readily apparent.

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes `of explanation and illustration, and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claim.

What I claim is:

In an oil burning furnace having a combustion chamber, fuel and air distributing means for distributing a fuel and air mixture into said combustion chamber, means operative at all times during operation of the furnace and independently of the supply of fuelby said first means for regulating the amount of combustion supporting air supplied to said combustion chamber, temperature responsive means responsive to temperature conditions within said combustion chamber, and

., said air regulating means'to decrease the supply of air upon a rise in combustion chamber temperlature and to increase the supply of air upon La drop in combustion chamber temperature independently of the supply of fuel.

WALTER H. DREW.