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Patented Nov. 16,1948
Nelson G. Goreau, New‘ Orleans, La.
Application June 19, 1945, Serial No. 600,365
6 Claims. (Cl. 122-'-250)'
My invention relates .to Fluid heaters in the
nature of an improvement on my prior patent,
No. 1,346,952, and relates particularly to heaters
of the Instant ?ash type. While intended more
particularly for heating water, it may be em
ployed for heating other ?uids.
One of the objects of the present invention is
lating refractory material which encloses a com
bustion chamber. This lining is bellmouthed at
its lower end and is cylindrical at its upper ‘end
but its main portion is diverging upwardly.v
The combustion chamber contains a helical
coil ID in proximity to the lining 8 so as to be
heated by radiation from the highly heated 1in~
ing. The convolutions of this coil are narrowly
to obtain an increase in the thermal efficiency of
spaced apart and converge downwardly so that
the heater by providing an improved construction
which embodies a casing lined with porous in— 10 water condensing thereon will be conveyed away
from the lower convolution andfrom the corn
sulating refractory material enclosing a combus
tion chamber, the walls of which are rapidly
heated to incandescence by a suitable fuel burner,
and placing a helical coil therein in close prox
bustion chamber.
The upper end of the coil I0 is connected with
the lower outer end of spiral preheating coils R2,
imity to said lining and thereby exposing the 15 the outer convolutions of which are very close
to the cylindrical portion of the lining 8, so that
major part of the helical coil to the intense heat
these coils are heated principally by convection.
radiated from the surface of the combustion
A spider with arms l3, inclined downwardly to- >
chamber, thereby producing the very highest
ward the center, is located below the coils l2.
thermal efficiency while employing the least
Positioned vcentrally within the coil I0, there is
amount of coil and other material embodied in
the heater.
Another object is to provide a preheating coil
above and in series with main helical coil which
is heated principally by convection in order to
a cup-like easing M which has a bottom is and
is coned upwardly in spaced relation from the
coil. It will be noted further from the drawings
that the convolutions of the, coil ID in upward
25 direction gradually approach closer and closer
conserve heat.
to the lining 8 while they gradually become posi
Another object is to so arrange the convolu
tioned farther and farther from the casing M.
tions of the coils that they will be narrowly
The lower end of a rod “3 is secured to the bot
spaced apart and that the condensate, which
The rod l8 toward its
condenses thereon, will be conveyed away from
the lower helical coil and combustion chamber
and to evaporate it within the heater.
Another object is to make the heater safe by
reducing the volumetric contents of the combus
tion chamber by venting the top and bottom of
‘ tom of M5 by nuts 20.
upper end is secured to the arms 22 of a spider
by a nut 24. The upper sides of the arms 22 are
provided with vent passages 34.
Standards 26
extend up from the arms 22 and support a down
draft de?ector 28. An escape vent pipe 30 is
secured to the upper portion of the standards 26.
A cover member 32 is supported at the outer ends
of the arms 22 and is centrally apertured for the
30, around which it is free to slide upwardly.
acteristic of my invention, are set forth with
water supply pipe 36 is connected with
particularity in the appended claims. The in
outer end of the coils 12.
vention itself, however, both as to organization 40 theAn
annular drip pan I92 is positioned below
and method of operation, together with additional
‘l to collect water which may drip
objects and advantages thereof, will be best un
of the combustion chamber. The
derstood from the following description of a
inner casing l4 serves as a receptacle to collect
speci?c embodiment when read in connection
water which condenses on the upper coils l2 and
with the accompanying drawings, in which,
runs down the inclined spider arms 13.
Fig. 1 is a view of the heater partly in vertical
The water which collects in these receptacles
section and partly in side elevation.
is quickly evaporated by heat from a burner 88
Fig. 2 is a sectional plan view on the line Z-2
supplied 'by a gas pipe 86. An opening I04 over
of Fig. 1 and partly broken away.
the pan Hi2 supplies secondary air to the com
Referring to the construction shown in the bustion chamber while an opening I06 through
drawings for the purpose of illustrating the prin
the center of the pan supplies primary air to
ciples involved in the invention, the numeral 7
designates an outside vertical annular casing
The operation and advantages of this ?uid
which may be constructed of any suitable mate
rial. This casing has a lining 8 of porous insu 55 heater will be apparent in connection with the
the structure, thereby relieving any abnormal
pressure due to accidental ignition of gas therein.
The novel features, which I believe to be char
foregoing description and the accompanying
drawing. Referring to the drawings, it is to be
noted that the space between the lining 8 and
the cup-shaped member l4 constitutes a com
bustion chamber that is annular and generally
of truncated cone in shape; that H! designates a
spiral coil having spaced convolutions which di
vides said chamber diagonally to form a dimin
ishing inlet combustion chamber and an ex
panding outlet ?ue; and that the numeral 88
designates a fuel burner for projecting ?ame
initially into said inlet chamber and then
2. The combination stated in claim 1, and a
drip pan at the bottom of the heater for re
ceiving and evaporating condensate from said
3. The combination stated in claim 1, and
means for admitting primary and secondary air
into said burner.
4. The combination stated in claim 1, and a
spiral preheating coil above the exhaust ?ue con
nected in series with the aforesaid spiral coil.
5. The combination stated in claim 1, and a
cup-like member spaced within said spiral coil.
6. The combination stated in claim 1, and a
top cover member loosely supported at the outlet
of the heater.
succession between said spaced convolutions into
said outlet ?ue.
If a large amount of gas in the combustion
chamber should become ignited, it will lift the
safety cover 32 to relieve pressure in the cham
ber and prevent damage to the structure. The
down-draft de?ector 28 in conjunction with the
references are of record in the
cover 32 provides for adequate venting through 20 file of this patent:
the vent passages 3'4 in the arms '22.
I claim: "
1. In combination with a ?uid heater having a
. Date
combustion chamber that is annular and gener
ally of truncated cone in shape and a spiral coil
having spaced convolutions, divides thechamber
in a diagonal direction to form a diminishing
inlet combustion chamber and an expanding'out
.let ?ue, and a fuel burner for projecting ?ame
initially into said inlet chamber and then in suc 30
cession between said spaced convolutions into
said outlet ?ue. '
Herresho? ________ -_ May 15, 1877
Chase ____________ __ July 5, 1887
Ward __.._'_ ______ __ Feb. 18, 1890
Schlumberger _____ __ Oct. 8, 1901
Sebald et a1. _____ __ Sept. 1, 1903
Beler ____________ _- July 8, 1919
Runnels _________ ___Nov. 26, 1929
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