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Патент USA US2409456

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Get. 15, 1946.
Filed' Jan. 8. 1944
5 Sheets-Sheet 1
MAREK vsmusmmw
Oct. 15",‘ 1946.
Filled Jan. 8. 1944
3 Sheets-Sheet .2
% Attorney
0d. 15, 1946.
Filed Jan. 8. 1944
3 Sheets-Sheet s
AREK s-rzusnmu
Patented Oct. 15, 1946
Marek. Steuerman, London, England
Application January‘ 8, 1944; Serial No.»517,601
In Great Britain March’. 26,1942
4 Claims.
(Cl. 110-175)
This invention concerns air preheaters for vfur
naces and the like. of the kind adapted to be
mounted on the inside or the ?re doorior in any
other suitable convenient position for the pur~ 5
pose of preheating air passing into the furnace
above the ?re grate with the object of obtaining
improved combustion of the fuel on such grate,
such preheaters each comprising a hollow body
adapted to be heated by the ?re in the furnace
tuous path at or near the upper part of the hol
low'body. .After leaving this tortuous path the
air may be discharged‘ directly’ intovthe‘ furnace
through one or more openings .in the front Wall
and/or top and/or ends of the hollow bodyior
in vany other suitable way, or‘ a supplementary
or superheating chamber may be provided at
the upper portion of V the preheater, which: cham
ber may project forwardly beyond the front‘fauce
of the front wall-1 of the hollow body, and. which
and constrcted so thatlair, ‘or some air, on its 10 may have. a rectilinear; curved, or otherwise suit
way into the furnace may pass through the pre'.
heaterand be preheated prior to entering the
An object of this invention is to'provide an im
ably shaped front wall. in which isor are- ar
ranged one or more discharge apertures.
The arrangement is» preferably such that‘ air
proved‘. form? of air preheater, and according to 15 is admitted into the space between the movable
?ap or partition and the front wall of the hol
the invention there is provided an airpreheater
low body through a gapbetween these two parts,
of'thelkind referred to for furnaces‘ and the like,
wherein within‘ the hollowbody, and behind the
front wall (i. e., the wall presentedzto the ?re)
thereof, is arranged a ?ap or partition. dividing
the‘ hollow body into two compartments, such
?ap or partition being movable towards and away
from the said front wall to. control the flow of air
the closing or opening’ of the said gap, and the
extent to which itis opened being obtained and
regulated by adjusting the movable ‘?apor par
tition'with respect‘ to the front wall of the hollow
body. Preferably said gap is provided at the
lower part of. the hollow body and. is constituted
on the one hand by ‘a‘longitudinal seat formed
25 upon the inside of the front wall-of the hollow
body, and on the other hand by the front ‘sur
face of the adjustable flap or partition which is
adapted, in the closed position of the ?ap or
partition, to seat upon the said‘seat, thus closing
‘30, the‘ gap entirely. ‘ Assuming, the preheater to be
set with its rear Wall vertical, the said longitudinal
through the space between the front wall of the
hollow body and the such ?ap ‘or partition, and
wherein means are, also provided for adjusting
the position of such. flap or partition preferably
from the exterior‘ of the hollow body.
Moreparticularly the invention is concerned
with air preheaters of the kind referred to and
in which 'baflle means are‘ provided within‘ the
seat, which is preferably horizontal, is convenient7
hollow body to ensure that the air to be preheated
ly disposed at a; shbrt distance from the bottom of
will take a tortuous‘ path through the hollow
the hollow body and‘ at a location intermediate
body; Therefore, according to a further feature
the‘ front wall and the, back of the hollow ,body,
of the invention ba?ie means are‘arranged be
' and the said movable flap or partition preferably
tween the said movable ?ap or partition and the
extends from end to end of the hollowbody and
said front wall of the hollow body to'de?ne one
the top thereof to a position somewhat be
or“ more tortuous‘pathsi to which theair passing
low the said seat so that the movable ?ap or
through the space between the front‘ wall of the
partition, with the said‘ sea-t, separates ‘the said
hollow body and the movable ?ap or partition 40 two
compartments of the hollow body from one
must, pass. Preferably the said ba?le means‘ are
constituted by co-operating interleaved baffles
another, aslot-like portionibeing left,‘ however,
adjacent the bottom ofthe hollow‘ body so as to
carried ‘respectively upon one surfaceof the said
serve ‘as an‘ air inlet for the entry of . air into
movable flap. or. partition. and,‘ on the. opposite in 45 the hollow body" and to the said regulatable gap
sidesurface ofrthersaid front ‘wall of the hollow
between the/movablerflap or» partition and the
Prefera'bly, buti'not necessarily, the-arrangement
of'the said'ba?le“ means‘ is such that the air to
said seat on‘ the front wall, Alternatively,.the
said adjustable ?ap‘ or partition may extendvto
the" bottom of the hollow body and be provided
with a hole or holes vfor the'passage of air there
forwards in the. hollow body‘ (i. e. transversely
through at positions below the seat of the front
of the‘said movable ?ap or partition and the
front'wall of thezhollowi body), the air preferably
Preferably‘the frontzwall of the hollow body is
enteringthetortuous- path" provided by the ba?le
formed internally with a.- series of ‘side by side
be preheated passes tortuously‘backwards and
meansi at or; near the. lower‘ part" of. the hollow
body, gradually rising‘ to, and. leaving the ‘tor
55 parallelbutisomewhat spaced channels arranged
one above the other and extending longitudinally
successive sections to expose otherwise hidden
of the hollow body, and between these channels
parts of the interior construction of the pre
are arranged the hereinbefore mentioned ba?ies
which exend parallel to the channels and back
Figure 5 is a section on line 5—-5, Figure 4;
wardly from the said front wall. Similarly the Cl
front side of the said movable ?ap or partition
is correspondingly formed, but the channels and
ba?les of this ?ap or partition are offset with
respect to those of the front wall, so that the
Figure 6 is a perspective view of the flap or
partition in the interior of the preheater.
The air preheater illustrated in the drawings
is intended to be attached to the inside of a fur
ba?les of the ?ap or partition project more or 10 nace door. The preheater comprises a hollow
less centrally into the channels of the front wall,
body I of rectangular form as seen from the
and vice versa.
rear. From back to front it is relatively shallow
The front surface of the front wall may be
as compared with its length and breadth and its
ridged or corrugated to increase its area and so
front wall 2 inclines backwardly and downwardly
to increase the heat exchange surface thereof.
Conveniently this front surface of the front wall
of the hollow [body is corrugated or ridged lon
gitudinally, the crests of the corrugations follow,
ing in shape, and coinciding in position with,
slightly so that it is rather nearer the rear of
the hollow body at the bottom thereof than it
is at the top.
At its upper end the front wall 2 is externally
and internally extended forwardly at 3 so as to
the bottoms of the channels in the rear side of 20 provide a longitudinal forwardly extending
the front wall, which bottoms are preferably of
chamber 12. The front wall 5 of this chamber
semi-cylindrical form (i. e., semi-circular in
is rectilinear and parallel to the back edge of
cross-section). Thus the front surface of the
the top ‘wall 6 of the hollow body, but the said
front wall of the hollow body will appear to be
front wall could be curved, e. g., convex, or in
made up of a series of parallel side by side su 25 clined forwardly from its ends towards its centre
perposed strips or bars, the front surface of each
if desired. The wall 5 is provided with a row of
of which is of part cylindrical form. The chan
air discharge openings 7 which are conveniently
nels and ba?ies of the said ?ap or partition may
circular in cross-section and of frusto conical
be shaped and arranged similarly to those of the
form, the narrower ends of the holes being their
front wall of the hollow body and the battles of
forward ends. The axes of the holes may be
both the latter and the said ?ap or partition may
horizontal or somewhat downwardly inclined and
taper towards their free longitudinal edges.
they may or may not be parallel as seen in plan;
A back plate may be provided to close the rear
for example, the axes of the holes as seen in plan
of the hollow body, or instead of using a back
may splay outwards somewhat in the manner
plate the furnace door may be relied upon to 35 of the thumb and ?ngers of an extended hand,
effect the closing of the rear of the hollow body.
or they may converge towards one another in
If, however, a back plate is used, then it is pro
a forward direction. Except for the discharge
vided with one or more air inlet openings. Such
holes above mentioned the front of the hollow
inlet opening or openings may be at any suitable
body is entirely closed.
position and of any convenient shape and size, 40
The bottom wall 8 of the hollow body is of a
but preferably a single opening is provided at
sinuous or ogce form in cross-section, so that
the lower part of the back plate, this opening
inside the hollow body the bottom is on two
being of elongated slot-like form extending al—
most from end to end of the plate and having
its upper edge coinciding with the lower edge
of the said movable ?ap or partition.
Preferably the front wall of the hollow body is
backwardly and downwardly inclined with re
spect to the plane passing through the rear edges
of the walls of the preheater, so that, regarding
the preheater in end elevation, it appears to de
crease in depth (from front to back) in a direc
tion from the top towards the bottom, i. e. it is
of wedge shape in end elevation.
Preferably the said movable ?ap or partition
is pivotally mounted at its upper end in the
hollow body, and screw and nut means are pref
erably provided on or near its lower end for ad
levels, that is to say, the bottom consists of two
longitudinal horizontal steps, a lower rear step
9 and a higher forward step I 0 separated by a
substantially vertical longitudinal part or “riser”
II. The rear edge of the said forward step is
provided with a backwardly directed ridge or
flange I2 which extends from end to end of the
hollow body and overhangs the more or less ver
tical part or “riser” II. This backwardly di
rected ridge or ?ange l2 constitutes a seat upon
which is adapted to sit, in certain circumstances,
the lower part of a hinged ?ap or partition l3
subsequently to be more fully described.
Between the part of the bottom wall 8 of the
hollow body and the bottom wall M (which wall
also serves as a baffle) of the said chamber 4, and
within the hollow body, are arranged a plurality
lusting the flap or partition, the screw part of
the adjusting means being extended so as to pro 160 of longitudinal parallel preferably equally spaced
ject rearwardly of the preheater and being
ba?ies “5 which are formed in one with the in-'
adapted to pass through the furnace door and
side surface of the front wall 2 of the hollow
to be provided with a handle or knob at its outer
body and extend from end to end of the latter,
end so that the required adjustments may be
to the bottom 8 of the hollow body and
made from the exterior of the furnace.
backwardly from the said front wall 2 so as to
In order that the invention may be thoroughly
have their rear edges substantially flush with
understood and readily be carried into practice,
rear edge of the said longitudinal seat ID.
drawings are appended hereto in which:
This rear seat edge, and the rear edges of all
Figure 1 is a front elevation of one form of
the above-mentioned ba?les, are spaced some
preheater constructed according to this inven 70 distance
from the plane containing the rear
edges of the top and bottom walls 6 and 8 and
Figure 2 is an end elevation of the same;
the side walls l6 and ll of the hollow body, and
Figure 3 is a section on line 3--3, Figure 1;
the ba?les l5 are preferably all of the same
Figure 4 is a back elevation of the preheater
from back to front as one another, and
shown in Figures 1 to 5 partly broken away in
as the front wall 2 of the hollow body inclines
"downwardly towards the‘ back of the_‘ hollow body,
‘the rear‘ edges of‘ the baflles ‘are ‘consequently
spacédprogressively further away‘ from-the said
plane ‘containing the ‘rearv edges of the- top and
bottom and side-walls of the‘hollow body, ‘start
ing from the bottom‘bai?e and travelling towards
and ‘ the ‘ front- surface of‘ the - hinged flap. ' ‘Thus
the cooperating parts -|2 and"23 act as'a form’ of
‘On the back of- the hollow body is secured,-by
screws, ‘the metal back cover plate‘ 25 which is
formed‘ of metal- and which. has a portion of elon
gated rectangular form cut out of its lower edge
the upper‘ ba?le.‘
to form an air inlet‘ opening 30 opposite the space
~iThe inside surface is‘ of ‘the front wall 2 of
between the bottom edge of the said hinged ?ap
the hollow body is, between‘ ea'ch'pair ofwbailles
l5».and between. the step [0 and the next ba?le 10 i3 and the lower and rearmost step-like part 9
'- and-between the topbaf?e. l5 and the lower wall
_"l4~>of the» saidlchamberllly is shaped to substan
tially semiecylindrical- concave formas seen from
the back,-and‘the outer frontlsurface of-the front
wall» '2' is correspondingly shapedso that the front
‘ wall ofii-the hollow body has-a plurality of longi
tudinal; parallelconvex ribs I9 projecting‘ there
‘from; the longitudinal grooves 0r depressions 2i]
" between which; ribs- correspond in position with
the‘ba?l‘es within the‘ hollow body.
of the bottomt of the hollow body. -‘
‘For the purpose of adjusting‘the hinged ?ap
i3 towards and away from the frontlwall 2 of ‘the
hollow body, a, screwed stem 3 I‘ is provided which
is mounted for rotatory, but non-axial, move
ment in a sleeve-32 screwed‘ into the back plate
‘25 at the lower part of, and perpendicularly to,
the-latter. The said sleeve is ‘adapted to pass
through the furnace door, and‘ the sleeve and
screwed stem are of! such a length as to be capa
ble of projecting beyond the outer side of‘the
= rib-s; ?ns, corrugations or projections may be pro
furnace door whilst the stem 3i also extends into
vided on the ‘hollow body if desired further to
the hollow body land into the said hinged'flap
increase'the area of- the heat exchange surfaces.
‘+3: The outer‘ end‘of‘ the screwed stem 3| is'pro
The irontiwall 2 also ‘has a flattened portion 39
on which may be carriedthe maker’s name or. . vid'ed‘ with a knob 33 for rotating it, and at‘ its
‘inner end“ thewstem is screwed into a nut~>35
which is housed in- a- non-rotatable mannerin
The ‘hinged flap or partition l3 above referred
a recess 36 provided‘v at the-lower central part of
to is disposed within the hollow body I, and com
the hinged'?ap I3 and closed by a Plate 31;
prises a rectangular'plate which is‘ of a length
Preferably the top, bottom and side or end walls
substantially equal to the distance between the
the preheater slope inwardly towards the front
inside surfaces of the two end walls 16 and I‘!
wall thereof.
of the hollow body, but which plate is of a, depth
In use the preheater is ?xed, for example by
from top to bottom somewhat less than the depth
studs 38 within the furnace, for example ?at
of the hollow body from top to bottom at the rear
against the inside surface of the furnace door to
the outside thereof so that the knob 33 can be
Adjacent its upper edge, the said plate is pro
manipulated from the outside of the furnace.
vided with a rib 2i carrying a trunnion 22 at each
The gap 30 at the lower part of the preheater
end (Figure 5) and each of these trunnions seats
is registered with a corresponding gap or with
in a bearing 23 (Figure 4) provided at the adja
cent end wall of the hollowbody, and the trun~ 40 one or more air inlet holes provided in the fur
nace door.
nion is rotatably secured in that position by a
The front wall 2 of the preheater is therefore
cover piece 24 recessed into the back edge of the
presented in a somewhat oblique position to the
end wall of the hollow body and secured in posi
?re within the furnace and in operation air enters
tion by one of the screws used to secure the back
through the gap 30 and rises within the pre
cover plate 25 (subsequently to be described) in
heater between the part 28 of the flap or parti
position. When hinged in the hollow body I the
tion l3 and the seat l2 and then passes in a
upper edge of rib 2! of the ?ap or partition [3
tortuous ‘backward and forward manner up
lies adjacent the inside surface of the top wall
through the preheater into the forwardly pro
6 of the hollow body.
jecting chamber 4 and eventually out of the dis
On its inner side the ?ap i3 is provided (see
charge holes ‘I in the upper forwardly project
Figure 6 in particular) with a plurality of equally
ing portion or bulge 5 of the preheater, the air
spaced parallel longitudinal baffles 26 which are
so leaving the preheater being directed towards
preferably cast integrally with the plate, the plate,
in cross-section, being of semi-cylindrical form
between each pair of bailles as shown at 21. The
baffles 25 on the flap is are similar to the baf?es
IE on the inside of the front wall 2 of the hollow
body I, but when the hinged plate is in position
in the hollow body, the ba?ies 26 of the flap are
offset with respect to the baffles IE on the hollow
body so that the latter baffles project into the
spaces between the baffles on the flap. However,
the baffles on the movable flap and those on the
front wall of the hollow body are preferably of
such dimensions that the baffles on the one part
never touch the bottoms of the grooves between
the baffles of the other part,
The flap l3 projects downwardly below the low
ermost baffle 26 on the plate so as to provide a lon
the ?re.
If the discharge holes 1 are arranged with their
axes downwardly inclined then the streams of air
issuing from these holes will be biased in a down
ward direction. The flow of air through the pre
heater is regulated by adjusting the flap or par
tition i3 to and‘ away from the front wall 2 of
the preheater by means of the adjusting screw
3! and the associated parts, this screw being op
erated by the knob 33 from the exterior of the
furnace. If desired, the intake of air can be en
tirely shut off by adjusting the flap or partition
l3 so that the part 28 thereof bears against the
seat I2.
I claim:
1. An air preheater for furnaces and the like
gitudinally extending dependent ?ange 2B which 70 comprising a hollow body, its top wall being sub
stantially imperforate, its rear wall being provided
adjacent its bottom edge with air in?ow means,
the rear wall being otherwise substantially im
provided on the hollow body, so as to prevent the
perforate, the front wall of said hollow body
ingress of air to the space 29 between the inner
surface of the front wall 2 of the hollow body 75 being provided with air out?ow means adjacent
is adapted, in the closed position of the flap, to
seat upon the hereinbefore mentioned seat 12,
its upper edge, the front wall being otherwise
substantially imperforate, the inner face of the
front wall being provided with ba?‘le-like forma
tions extending generally in like directions and
transversely to the direction from said air in?ow
means to said air outflow means; a plate disposed
‘within said hollow body intermediate the inner
face of said rear wall and said baf?e-like forma
face of the front wall and said ba?ie-like forma
tions of said inwardly disposed plate extend mu
tually in parallel directions and substantially at
‘right angles to the direction from said air in?ow
means to said air out?ow means.
4. An air preheater for a furnace or the
like, comprising a hollow box-like body, such
body including a rear wall provided with air inlet
means at its lower part and including a front
tions of said front wall, said inwardly disposed
plate having baffle-like formations facing said 10 wall having air discharge means at its upper
bailie-Iike formations of said front wall and gen
part, a flap mounted within said body between
erally in like directions and extending trans
said front and rear walls and pivotable about its
versely to the direction from said air in?ow means
to said air out?ow means, the free edges of said
baffle-like formations of said inwardly disposed
plate being disposed alternately with respect to
the free edges of said baffle-like formations of
said front wall; means for pivotally mounting
said inwardly disposed plate at its upper por
tion; and means extending through said rear
wall for adjusting the pivotal position of said in—
wardly disposed plate.
upper end, means operable from the exterior ‘of
said rear wall for moving the lower end of said
?ap towards or away from said front wall, a
shoulder on said front wall co-operating with
the lower end of said flap to form a variable air
inlet to the space between the ?ap and the front
wall, a plurality of ba?les on said front wall pro
jecting into said space between the ?ap and front
wall, the parts of the rear face of said front wall
between said bailles being of semi-cylindrical form,
2,. An air preheater pursuant to claim 1 in
a plurality of baffles on said ?ap, such ba?les ex
which said ba?le-like formations at the inner
tending towards said front wall and being offset
face of the front wall and said ba?le-like forma
tions of said inwardly disposed plate extend mu 25 relatively to the baflies on said front wall, and
the parts of the front face of said ?ap between
tually in parallel directions.
the ba?les thereon being of semi-cylindrical form.
3. An air preheater pursuant to claim 1 in
which said baffle-like formations at the inner
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