US1422416A - Combustion and mixing chamber for dehydrators - Google Patents

Description

I'. C. CHAPMAN. CQMBUSTION ANID MIXING CHAMBER FOR DEHYDRATORS. APPLICATION FILED SEPT. 28. 1920. magma N .mm

F. C. CHAPMAN.

COMBUSTION AND MIXING CHAMBER FOR DEHYDRATORS.

APPLICATION FILED-SEPT. Z8, 1920.

AQQA 16.

Patented July M, 1922. 2 SHEETS-SHEET 2.

INIENTOR.

or as FRANK C. CHAPMAN, OF MODESTO, CALIFORNIA.

COMBUSTION AND MIXING CHAMBER FOR DEHYDRATORS.\

Specification of Letters Patent.

Patented July 11, 1922.

Application'iled September 28, 1920. 'Serial 110.413,452.

To all who/mit may concern `Be it known that I, FRANK G. CHAPMAN, a citizen of the United States, residing at Modesto, county of Stanislaus, State of California, have invented certain new and useful Improvements in Combustion and Mixing Chambers for Dehydrators; and I do declare the following to be a full, clear, 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 of this application.

This invention relates to improvements in oil-burning heating furnaces for dehydrators or fruit drying plants, the principal object being to provide a device of this character with which a large volume of air may be heated to a very high degree fwith a minimum of expense, and with which the temperature and the quantity of air passed around the dehydrator may be regulated to a nicety.

A second object is to provide means for heating the oil prior to its admission to the burner-nozzles, and to provide a supply of steam which will be mixed with the oil lssuing from the burners, the generation of the steam and the heating of the oil being had with the beati from the furnace once the burners are started. I have also provided means for regulating the amount of heat which may be utilized to heat the oil and generate the steam.

A further object is to arrange for the return of the hot air to the mixing chamber after passing through the dehydrator, so

that it may be used over after reheating it,

the amount of fuel to accomplish which being of course considerably less than would be necessary to heat an equal amount of cold all?.

This feature alone reduces to a great extent the expense of operation of the furnace, saving considerable oil.

.The device may also be used for other purposes than for dehydrators, since it may readily be adapted to heat buildings of any kind, large or small.

A further object of the invention is to produce a simple and inexpensive device, and yet one which will be exceedingly eifective for the purposes for which it is designed.

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

In the drawings similar characters of reference indicate corresponding parts in the several views.

Fig. 1 is a longitudinal section of the device.

Fig. 2 is an enlarged cross section taken on a line 2 2 of Fig. 1.

Fig. 3 is a plan. section taken on a line 3-3 of Fig. 2.

Fig. 4 is a similar view taken on a line 4--4 of Fig. 2.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes a heating or combustion chamber, made of tire clay or brick or simi-Y lar material, and preferably cylindrical, being closed at its outer end by a wall 2.

The inner end is provided with a butteriy damper 3 operable from the exterior by any suitable means.

A plurality of oil-burner nozzles 4 pro.- ject into the chamber 1 on one side thereof, and preferably at an angle, there being openings 5 in the walls of the chamber and surrounding the nozzles, the size of said openings being regulated by sliding doors G.

The oil supply is taken from a tank or reservoir 7 through a pipe 8 which has a coil 9 interposed therein and situated in a chamber 10 above the chamber 1 and having communication therewith through an opening 11 the size of which is regulated by a sliding damper 12, said chamber 10 also having a door 13 at its outer end.

Steam for the nozzles 4 is supplied by means of a pipe 14 which passes through a. chamber 15 alongside the chamber 10 but i11- dependent thereof, this chamber having1 communication with the chamber 1 throug an oper-ing 16 fitted with a damper 1 7 and having a door 18 at its outer end similar to the door 13. The pipe 14 leads to and from a boiler 19 of any suitable character, from which a pipe 20 passes to the nozzles 4. The initial amount of steam is generated by starting a small fire of any suitable character in the chamber 15.

The chambers 10 and 15 extend to the ine ner end of the combustion chamber 1 and are open at that end, being provided wlth suitable dampers 21 near such ends.

These three chambers open into a mixing chamber 22 from which, adjacent the, chambers 1, 10 and 15, a stack or flue 23 leads upwardly a certain distance, being provided with dampers 24.

At the opposite end of the chamber 22 is a blower 25 having its intake opening into said chamber, the discharge from the blower leading through the dehydrator, the type of which is preferably that shown in my copending application Serial No. 378,158, filed May 1st, 1920. After passing around the dehydrator the air is led above the chamber 22 and to the end of the same adjacent the flue 23 through a return-flue 26.

I may also provide a transverse horizontal adjustable damper 27, hinged adjacent the lower and inner end of the combustion chamber, and projecting into the mixing chamber 22, so that the highly heated air will be more positively directed into the flow of cold air coming down the stack, so as to get a more thorough mixture. I

In operation, the lirst step is the generation of an initial quantity of steam for the burners, as described.- rl'he burners are then started prior to the turning over of the blower, air for the burners being had through the openings 5. At the same time, heat is allowed to enter the chambers 10 and 15,'tlius both heating the oil used therea fter and providing a suitable supply of steam. Until the combustion of the fuel reaches as near perfection as possible,- the heat is allowed to pass up the stack 23, so as to allow any smoke or other products due to imperfectcomlmstion to escape.

When sufficient heat is generated, the

blower is started up, drawing the heated air therethrough, a fresh supply being then drawn into the mixing chamber 22 down the stack 23 by reason of the force of the suction of the blower, the amount of cold air being thus drawn in being regulated by adjustment of the dampers 24.-.

As soon as the heated air has circulated through the dehydrator and is returned to the chamber 22, it will be evident that the burners ma be cut down, as less cold air is then being dr necessary to raise this once-circulated air to the required degree of heat.

As the burners are throttled down the amount of heat entering the chambers 1f.) and 15 may be also cut down, so that the oil will not be overheated nor an undue head of steam generated.

The use of a circular combustion chamber, and the projection of the burner nozzles thereinto at a forward angle and substantially at a tangent, are very important features since by this means the flame whirls or spirals around the chamber several timos before issuing at the inner end, thus insuring' awn in, and not so much fuel is of the device, still in practice such deviations from such detail may be resorted to as donot form a departure from the spirit of the invention, as defined the appendedclaims.

Having thus described my inventibn what I claim as new and useful and desire to secure by Letters Patent, is: A f

1. A device of the character described including a combustion chamber, oil burners projecting thereinto, a steam supply pipe connected to said burners, and a pair of independent chambers adjacent the combustion chamber and communicating therewith, the oil supply pipe passing throu h one of said last named chambers and t esteam pipe passing through the other one thereof.

2. A device of -the character described including a combustion chamber, oil burners projecting thereinto, a steam supply pipe connected to said burners, a pair of independent chambers adjacent the combustion chamber and communicating therewith, and means for regulating the degree of heat in said chambers, the oil supply pipe passing through one of the same and a water pipe connected with the steam pipe passing through the other one of said chambers.

3. A device of the character described in cluding cylindrical combustion chamber closed at its outer en d and opening into an air-mixing chamber at its inner end and burner nozzles projecting into the chamber at afforward angle thereto and substantially tangential. therewith.

4. A device of the character described, includin a combustion chamber, oil burners projecting thereinto, a steam supplyk with i including a combustion chamber, oil burn ers projecting thereinto, a steam supply pipe connected to said burners, a pa1r of independent chambers communicatlng with the 'QmbuSton chamber, the Q11 .supply maaar@ pipe passing through one chamber and the steam pipe passing through the other, independent means for each chamber for controlling the amount .of heat which may pass therein from the combustion chamber, and means independent from said first named means for controlling the admission p of relatively cool air to said chambers independently of each other.

6. A device of the character described including a combustion chamber opening t one end into an air-mixing chamber, oil urners projecting thereinto, a steam supply pipe connected to said burners, a pair of independent chambers communicating with the combustion chamber, the oil supply pipe passing through one chamber and the steam pipe passing through the other, adjustable dampers between said chambers and the 4its inner end, and

7. A device of the character describedA comprislng a relatively long cylindrical combustion chamber closed at its outer end and opening into an air mixing chamber at a plurality' of longitudinally spaced burner nozzles projecting into the chamber tangentially thereof and at a forward an 1e, whereby the flames issuing from the nozes will work toward the inner end of the chamber in the form of spirals sweeping the entire Surface of the chamber walls. L j- In testimony whereof I afx my signature.

FRANK 'CARPENTER CHAPMAN.

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