US2289759A - Warm air heater - Google Patents

Description

July 14, 1942. J. R. DENlsE y 2,289,759

WARM AIR HEATER Filed Oct. 22, 1940 Z'Sheets-Sheet l Snventor (Ittorneg July 14, 1942. J. R. DENlsE v 2,289,759

WARM AIR HEATER Filed Oct. 22, 1940 2 Sheets-Sheet 2 39 Fligg; 4, 31g f j t :V A0, s

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Y F .5. vnz, 'I :2-9- rg Fg. r 4/ JU/m E. Den/15e Patented July 14, 1942 WARM AIR HEATER John 'Il'. Denise, Columbus, Ollio,l assignor to General Properties Company, Inc., a corpora.-

tion ot Delaware Application October 22, 1940, Serial No. 362,218

o `2 claims. (c1. 12e-11o) This invention relates to improvements in gasred warm-air 'heaters embodying within a single housing or cabinet a radiator for heating the air, burner means for heating ythe radiator, a blower for forcing the air to be heated over the radiator, and means for filtering the air before it reaches the blower intake.

The object of the invention is to arrange the parts within the housing in such a way as to provide a relatively compact heater unit; to provide an arrangement which will permit the blower to be readily installed in the housing; to provide an `improved burner Aarrangement for heating the radiator, and to provide other improvements hereinafter more fully appearing.

In the accompanying drawings forming part of this specification- Fig. 1 shows the interior arrangement of parts within the heater housing, some of the parts being in elevation and others irl-.vertical section.

Fig. 2 is a somewhat enlarged fragmentary view taken on line 2--2 of Fig. l.

Fig. 3 is .a fragmentaryv'vertical section on a somewhat enlarged scale of parts shown in Fig. 2.

Fig. 4 is a fragmentary vertical section on lino t-il f Fig. 1. E

Fig. 5 ls a vertical section online 6 5 of Fig. t.

Fig. 6 isa fragmentary section on line t-t of Fig. 1. j

Fig. 7 is a fragmentary section on line i-l oi Fig. 1.

Fig. 8 is a fragmentary top plan view of one of the burner heads.

Fig. 9 is` a perspective plan view showing how certain of the burner heads are interconnected.-

The heater housing is rectangular in plan andl comprises a pair of upright laterally-spaced side walls I0 and upright connecting walls li and i2. For descriptive purposes, the wall' il will sometimes be referred to as the front wall of the housing, and the wall l2 as the baci; wall thereof. The bottom wall-of the housing is indicated at it and the top wall at it. In the back wall at the lower end thereof is an opening it constituting an air inlet to the housing, and in the top wall is an opening it constituting the air outlet from the same.

i t indicates a blower, 20 a driving motor there- 'ior, 20' the drive belt, and ti a structural steel frame on which both the blower and motor are mounted, the frame being slidably supported on a trackway comprising rails 22 secured to the opposite side walls it, the rails being shown as channel irons whereby to provide below said frame a'guideway 23 for an upper tray-type air lter Il, it being noted that the filter is normally disposed with its front end I8' a substantial distance inwardly of the plane of the front wall il.

Below the guideway 23 is another similar guideway 23' for a lower tray-type air filter Il, it being noted thatthe rear end Il' of the filter terminates a substantial distance inwardly of the plane of the back wall i2. An upwardly inclined wall 2l between the filter guideways 23 and 23 .insures that air entering the inlet i 5 shall ilow in part through the upper and in part through the lower filter, it being understood that the wall 24 extends all the way across the housing between the sidewalls it thereof. The front wall il comprises panels ila and lib. By removing the panel lia both filters may be with- 4drawn from the heater-.housing as will now be readily understood. By removing both of the panels lia and I Ib and an inclined wall indicated at 26, the frame 2| with the blower and motor thereon may also be withdrawn from said housing. As shown in Fig. 7, the wall 25 is slidably connected to the side walls i0 of the heater housing, thus permitting ready removal of the wall 2li by a downward pull.`

Above the blower i9 is a horizontally disposed wall 2B which extends between the side wallsi0 of the heater housing and from the back wall i2 thereof forwardly to the upper end of the inclined wall 2t, the walls 25 and 2li therefore serving` to divide the housing into main upperand lower compartments. The wall it adjacent the back wall i2 of the enclosure is provided with a rectangular opening 29 shown as surrounded by anvupstanding collar it, the blower i@ having a top outlet 3l adapted to underlie the said opening when the blower is in its normal position in the enclosure, the outlet of the` blower being shown as comprising an upstanding collar Et, it being noted that the top of the collar is below the level of the underside of the wall @il as clearly shown in Figs. 4 and 5. v

Secured to and depending from the under side of the wall 28 are two parallel laterally-spaced guide strips 33 which extend from the baci: wall l2 of the enclosure to a point short of the upper end of the inclined wall 2t, the collar @t of the blower outlet being conhned between these strips, there being interposed between the strips and the adjacent sides oi the collar a strip of packing material tt 'which is preferably secured to and carried bythe walls of the collar t2. Interposed between the back wall l2 oi the enclosure and the adjacent wall oi the collar it is another packing strip 34', preferably carried by the collar wall and adapted to engage the back wall itself or a parallelly extending abutment secured to the wall i2. Secured to the front wall 32 of the blower outlet is an upright flexible packing strip 36 in frictional engagement with the underside of the Wall 28. .It will now be readily appreciated that the two packing strips 34, the packing strip 34 and the packing strip 36 serve to prevent objectionable leakage of forced air from the blower at the joint between the top of the blower outlet collar 32 and the'wall about the opening 29. It will now also be understood that there is a severable connection between the blower outlet and the flow passage 29 in the wall 28 and that the blower unit as a whole may be readily inserted into and withdrawn from the enclosure after the inclined wall 25 and the front panels Ila and Hb have been removed. Removal of the wall 25 is accomplished by rst removing the said panels ila and lib.

38 indicates a. radiator comprising a plurality of upright tubular elements 39 which are relatively long and narrow in cross-section, the elements being secured at their lower end to a horizontally disposed lplate or wall 40 having openings with which the lower ends of the tubular elements are in register, it being understood that the openings have the same shape in plan as the bottom openings of the tubular elements. The tubular elements are arranged in laterally spaced relation with theirbroad sides facing each other to provide air flow passages therebetween, the broad sides of said elements being preferably provided with a series of verticaliyspaced horizontally-disposed heat radiating fins 4I. provided on the interior walls of the tubular elements, as will be readily understood. 'I'he upper ends of the tubular elements are connected to a horizontally disposed wall 42 which constitutes the bottom of a waste gas manifold 43 shown as provided with a top outlet 44 which extends through the top wail I4 of the heater housing.

Between the walls 29 and 40 are two side walls 35 and an end wall 31 whereby to form a compartment wherein burner heads 46 are located. A wall 41 extending downwardly at an angie from the front wall Il of the enclosure to the adjacent end of the wall 49 separates the burner compartment from the radiator compartment, it being understood that the wall 41 extends all the way across between the side walls I of the enclosure. The top wall I4 and the upright walls lll, Il and I2 of the radiator compartment are shown as double for heat insulating purposes.

Each radiator element 39 'is individually internally heated by flames from a burner head 46 therebelow, the burner head having a flat top which is multi-apertured throughout its length to provide a. substantially continuous flame from one end of the burner head to the other and crosswise of the burner head, it being understood that the flame in plan is long and narrow, the same as the lower end of the tubular element. As shown inFig. 8, the apertures in the burner head are preferably formed by a piurality of paralleliy extending corrugated strips 48 separated by spacer strips 49'. Burners of this type are commonly known as "ribbon burners.

Inasmuch as the burner heads," are positioned one directly, below each tubular element 39, the'iiame from each burner head passes directly upwardly into the tubular element. The

Heat absorbing fins not shown may also be .compartment wherein the burner heads are located therefore remains relatively cool. It will be understood that secondary air is required to complete the combustion oi the fuel issuing from the individual burner heads. The inlet for secondary air is indicated at 52 between the two inclined plates 25 and 47. In order that the secondary air may flow into the lower end of the tubular elements 39 with minimum turbulence, a downwardly and outwardly flaring mouth 53 is provided at the lower end of each said tubular element. 'I'his mouth will of course be of substantially the same-shape in plan as thel lower end of the radiator element and is preferably formed by securing to the under side of the plate 40 between adjacent radiator elements an elongated body 5t whose longitudinally extending sides -curve downwardly toward each other, as clearly shown in Fig. 3. Screws 55 passed through the body 59 and through the plate 49 and into the bottom flanges of the tubular elements serve to Icla'm'p'the plate 40 between the said flanges and the said body 55.

Secured to the upright wall 31 which forms the back end of the burner compartment is a bracket 56 having a horizontal row of holes for receiving .pins 51 extending from the adjacent end of each burner head, whereby to support the burner heads in proper position in the burner compartment. Means including a horizontally extending gas-supply manifold 58 and mixing tubes 59 for the burners serve to hold the other end of the -burner heads in proper position.

A single mixing tube 59 preferably supplies a .pair of adjacent burner heads, and such burner Y heads are cross connected by a flame propagating portion 60, as clearly shown in Fig. 9, with the result that as soon as the combustible mixture issuing from one burner head has been ignited, the adjacent burner head will also be ignited by propagation of the flame along the .portion 60. A -pilot for igniting the burners is indicated at 6I. Referring to Fig. 2, it will be noted that there are three pairs of burner heads and therefore three mixing tubes 59. In order that the burner heads of the pair most remote from the pilot may be ignited, there is provided between adjacent heads of adjacent pairs a flame propagating portion 62 similar to the portion 60 previously described. The portions 60 and 62 are integral with the burner heads and are hollow, whereby gas flows into the same from the adjacent burner heads. The gas discharge slot in said portions 60 and 62 may be formed by a single corrugated strip similar to the strip 48 shown in Fig. 8. It will be understood that -by removing the front panel Hb of the front wall I I, access may :be readily had to the burner compartment.

The forced air from the blower I9 on entering the radiator compartment is deflected toward the radiator by a .plurality of defiector elements B5, 66 and 61. From what has been said, it will be understood that the air flows between the radiator panels for heating and then flows out of the enclosure by way of the top outlet I6.

'I'he primary reason for inclining the walls 25' and 41 is to provide a space wherein the various heater controls (not shown) may be housed.

What I claim is:

1. In an air heater, the combination of a, relatively tall cabinet, a partition wall dividing the cabinet into upper and lower compartments and having an opening adjacent one side of the cabytally extending second .wall thereabove forming between themselves a burner compartment at one side of said opening, a. blower in the lower compartment `for delivering forced air to the upper compartment by way of said opening, a-plurality of radiator tubes extending upwardly into the upper compartment :from said second wall, burners in `said burner compartment individual inet, means comprising said wall and a horizontally extending second wall thereabove forming between themselves aburner compartment at one side of said opening, a. blower in the lower compartment Ifor deliveringforced air to the upper compartment by way of said opening, a plurality of radiator tubes extending upwardly into the upper compartment from said second wall, burners in said burner compartment ndito each-radiator tube, and means for supporting 10 vidual to each radiator tube, means for supportsaid burners in alinement with and sufficiently close to their respective radiator tubes to iire directly therento whereby to avoid substantial heating ofsad second wall.

2. In an air heater, the combination of a relatively tall cabinet, a partition wall dividing the cabinet into upper and lower compartments and having an opening adjacent one side of the ca bing said burners in alinement with and sufIiciently close to their respective radiator tubes to re directly thereinto whereby to avoid substantial heating of said second wall, and a removable wall comprising a part of the cabinet side wall for permitting access to the burner compartment.

JOHN R. DENISE.

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