US2108033A

US2108033A - Hot air furnace

Info

Publication number: US2108033A
Application number: US105038A
Authority: US
Inventors: Barclay B W Cooper
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-10-10
Filing date: 1936-10-10
Publication date: 1938-02-15
Anticipated expiration: 1955-02-15

Description

Feb. 15, 1938. B. B. w. COOPER HOT AIR FURNACE Filed Oct. 10, 1936 m a u u u a a a a1! a u a \a u u u u u u INVENTOR Barclay BJMCooper' I BY%Z ATTO NEY Patented Feb. 15, 193av UNITED STATES PATENT OFFICE HOT AIR FURNACE Barclay B. W. Cooper, Oklahoma City, Okla.

Application October 10, 1936, Serial No. 105,038

3 Claims.

My invention relates to hot air furnaces, and

more particularly to a unit adapted to be suspended from the floor of a residence to heat the same.

crease .the heating capacity without increasing the fuel consumption or size.

Another object of my invention is to provide a floor furnace construction of increased efliciency, compactness and one which is simple and inexpensive to manufacture.

Other and further objects of my invention will appear from the following description and claims.

In the accompanying drawing, which forms part of the instant specification and which is o be read in conjunction therewith, and in Whibfl like reference numerals are used to indicate like parts in the various views.

Fig. 1 is a sectional elevation of a floor furnace showing one embodiment of my invention.

Fig. 2 is a sectional view taken on the line 2-2,

4. A combustion chamber is formed in one corner of the casing 4 by means of a baflie 5. The construction is such that'an elongated opening 6 is formed by one edge of the baiiie with a side wall of the casing 4.

Any suitable gas or oil burner, as for example gas burner l, is positioned to burn fuel in the combustion chamber 8, formed by the baille 5 with the casing 4. Gas is furnished to the humor I through line 9. The products of combustion discharge tangentially through the opening 5 into the heat exchange chamber ill in which a plurality of inclined heat exchange tubes II are positioned. The exterior of the casing 4 is provided with a metal fluting l2, forming a plurality of flues I3 open at both ends. A duct 14 opens into the heat exchange chamber 10 and provides communication between the heat exchange chamber and a' flue pipe, not shown. The heat exchange tubes II are closely spaced at their lower ends and more widely spaced at their upperends, as can more readily be seen by reference to Fig. 1. A flow baflie l5 is'carried by the casing l in the vicinity of the air inlet to the heat exchange tubes ll. The'corners of easing 4 are rounded at l6, l1 and II to provide a smooth wall for the whirling of the hot products of combustion which are tangentially discharged into the heat exchange chamber.

In operation, the burner I is' lighted and the combustion takes place in the combustion chamber 8. The hot products of combustion are tangentially discharged from the' combustion chamber through the opening 6, from the upper end of the combustion chamber. The volume of the hot products of combustion is such that some pressure is built up in the combustion chamber, causing the hot products of combustion to flow with a whirling motion at considerable velocity. The casing 4 becomes heated, as do the tubes ll. Air from the room to be heated will drop downwardly through the annular space formed by casing I and casing 4. As the air passes incontact with the exterior surfaces of the metal fiuting 12 it will become heated and tend to rise. A portionof the air will rise through the flues l3 formed by the side walls of the casing d and the metal fluting it. A large portion of the air will flow toward the lower openings of the tubes it which are grouped. A mass flow of the air will be caused to take place by reason of the grouping in close proximity of the openings of' the tubes l l. The air rising through the heated tubes will be come heated by convection heat. The heated air rising through the tubes leaves them at their upper ends and passes through the grillll into the room to be heated. The inclining of the tubes will tend to prevent stratification of the air flowing through them. It will be readily appreciated that if a blanket of hot air adjacent the tube wall is permitted to form, the air in the center of the tube will be partially insulated and less eflicient heat exchange will occur. With the tubes inclined the heated air will rise and permit further and cooler air to contact the hot tube wall. It will be observed that the lower walls of the tubes are outermost and will therefore be heated to a higher temperature by the circulating combustion gases.

It will be seen that I have accomplished the objects of my invention. I have provided a simple and inexpensive floor furnace of compact design and efllcientconstruction. I am enabled to obtain great efliciency due to the novel construction.

It will be understood that certain features and sub-combinations are of utility and may be-employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of my claims. It is further obvious that various changes may be made in details within the scope of my claims, without departing from the spirit of my invention. It is, therefore, to be understood that my invention is not limited to the specific details shown and described.

Having thus described my invention, what I claim is:

1. In a hot air furnace, a housing, a casing positioned within said housing in spaced relation therewith to form an air heating passage, means in said casing dividing the same into a combustion chamber and a heat exchange chamber and cooperating with the side wall of said casing to provide a discharge of combustion gases tangentially of said wall of the casing to impart a whirling motion to the gases in said heat exchange chamber, a flue connection communicating with said heat exchange chamber at a point spaced from said discharge means along the axis of whirling.

2. In a hot air furnace, a housing, a casing positioned within said housing in spaced relation with the side walls and bottom thereof to form side passages and a bottom. passage therewith, means in said casing dividing the same into a combustion chamber and a heat exchange chamber and cooperating with the side wall of said casing to provide a discharge of combustion gems tangentially or said well of the casing to impart a whirling motion to the gases in said heat exchange chamber, a flue connection communicating with said heat exchange chamber at a point spaced from the discharge means along the axis of whirling, saidcasing being provided with metal fluting secured to the exterior thereof forming fines with the casing side walls.

, 3. In a hot air furnace, a housing, a casing positioned within said housing in spaced relation with the side walls and bottom thereof to form side passages and a bottom passage therewith, means in said casing dividing the same into a combustion chamber and a heat exchange chamber and cooperating with a side wall of said casing to provide a discharge of combustion gases tangentially of said wall of the casing to impart a whirling motion to the gases in said heat exchange chamber, a flue connection communicating with said heat exchange chamber at a point spaced from the discharge means alon the axis of whirling, a heat exchange tube positioned within said heat exchange chamber, and a baflle in said lower passageway for directing air to be heated to the lower end of said heat exchange tube.

BARCLAY B. W. COOPER.

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