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Патент USA US3072192

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Jan. 8, 1963
P. w. s. PERSSON
3,072,182
REGENERATIVE HEAT EXCHANGERS
Filed March 29, 1955
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Jan. 8, 1963
P. w. s. PERSSON
3,072,132
REGENERATIVE HEAT ,EXCHANG'ERS
Filed March 29. 1955
4 Sheets-Sheet 2
5E5
INVENTOR.
Jan. 8, 1963
P. w. s. PERSSON
3,072,182
REGENERATIVE HEAT EXCHANGERS
Filed larch 29, 1955
4 Sheets-?nest 4
?u
EINVENTZR.
United grates Fat-em: @hdce
3,®'Z2,l32
Patented Jan. 8, 1963
1
2
3,072,132
equipment the weight of the bearing means will be far less
than in an arrangement of the bearing assembly in which
REGENERATEVE HEAT EXCHANGERS
Per Walther Sigvard Persson, lohanneshov, Sweden, as
signor to Svensha Rotor Masldner Alrtieholag, Naclra,
Sweden, a corporation of Sweden
Filed Mar. 29, 1955, Ser. No. 497,619
12 Claims. (Cl. 165-9)
the same is located at the outer periphery of the rotor.
Less expensive and improved means for peripheral drive
of the rotor can be attached to the rotatable member of
the bearing assembly.
A further object is to provide a structural framework
supporting said exchanger and including a hub portion
encircled by the rotor and carrying the lower supporting
The present invention relates to improvements in and
relating to regenerative heat exchangers of the rotary type 10 member of the bearing assembly. The casing enclosing
and particularly to the adaptation thereof to a new kind of
the rotor does not carry the rotor as in common heat ex
changer designs heretofore and because of this feature the
rotor, the rotor comprising an annulus having inner and
shell thereof can be made thin walled and comparatively
outer shell walls de?ning the same and bearing means for
light.
rotatably supporting the rotor at the inner shell wall there
of with respect to the stationary casing component of the 15 It is therefore an additional object of the present in
apparatus.
vention to provide a new and improved preheater con
central shaft suspended by a support bearing mounted
struction which for a given size and capacity is materially
lighter and less expensive than the presently best available
above the rotor and steadied at its lower end by a guide
bearing. The rotor is divided into sector shaped com
_ constructions, and which provides further advantages the
nature and details of which will appear more fully as this
According to a conventional design the rotor includes a
partments by means of radially extending partition walls
and the sector shaped compartments are ?lled by heat
transferring plates, said plates upon rotation of the rotor
?rst accumulating heat from the hot gases and then, after
entering the air side, delivering the accumulated heat to
the air. The shaft needs only to be dimensioned to meet
the requirements as to structural strength and for that
reason the inner ends of the sector shaped compartments
become too narrow in width and not worthwhile to be
?lled with heat transferring plates. Therefore, it is cus
tomary to cut off the inner end of the sector shaped com
partments by means of transverse wall sections and to
cover these inner sector subcompartments by means of
annular disc closures attached to either end of the rotor.
It is obvious that in the conventional design of the
devices to which the invention relates a centre portion of
the rotor exists which is of little use for heat exchange pur
poses. Therefore, it is a ?rst object of the invention to
‘speci?cation proceeds.
Other features and advantages of the present invention
and the manner in which it may be carried into practice
will become apparent upon consideration of the following
detailed description of different examples of constructions
embodying the principles of the invention and illustrative
by way of example but without limitation. Reference is
bad to the accompanying drawings in which:
FIG. 1 is a vertical central section, taken on line 1-1
of FIG. 2, of a rotary regenerative heat exchanger sup
ported from below and embodying the principles of the
invention.
FIG. 2 is a partial top plan view taken. on line 2-2 of
p the heat exchanger shown in FIG. 1.
FIG. 3 is an elevation, partially broken, of another
similar form of heat exchanger according to the invention.
FIG. 4 is an elevation, partially broken, of a further
similar form of heat exchanger according to the invention.
derive advantages from the inactive centre portion of the
FIG. 5 is an elevation, partially broken, of another
rotor to the end that this space may provide for an at- ‘> similar form of heat exchanger according to the invention.
tachment for revolving the annular rotor equipment which
FIG. 6 is an elevation; partially broken, of still another
will provide the equipment with a ball bearing assembly
similar form of heat exchanger according to the invention.
on which the rotor is carried by its own weight on which
FIG. 7 is a partial bottom plan view of the heat exchang
the same can be operated and wherein one of the races is
attached to the rotor as a carrier for the same while the
other race serves as a support for connecting the assembly
to a structural framework supporting the heat exchanger
ers shown in FIGS. 1 to 6.
FIG. 8 is a vertical section of a heat exchanger accord
ing to the invention but suspended from above.
FIG. 8a is a sectional view of a modi?ed detail of an
and wherein access can be readily had to the interior of
the race members for removal or changing of the ball
arrangement in FIG. 8.
bearings.
larged scale of the bearing means such as shown in FIG. 1.
Referring now more particularly to FIGS. 1, 2, 7 and
9, there is illustrated one suitable form of preheater for
Other objects of the present invention are to provide a
ball bearing assembly as the single means on which the
rotor weight is carried at the inner periphery of the an
FIG. 9 is a fragmentary broken vertical section on en
carrying the invention into effect. The apparatus shown
comprises a stationary outer casing structure, indicated
generally at it}, having a shell 12, which advantageously
55
ratus are of minimum value so that the rotor weight is dis
is of relatively thin section because of weight considera
tributed to as many balls as possible around the ball bear
tions, and spaced end plates 14 and Ira between which the
ing assembly. A further object is to provide a bearing
rotor is mounted. End plate 14» is provided with two
assembly for the rotor having suf?cient width to carry the
sector shaped openings or ports 13 and 2t) located gen
erally on opposite sides of a diametral plane through the
rotor without any risk involved of tilting of the rotor and
in which any guide bearing means otherwise customary 60 heat exchanger. These ports are connected respectively
nular rotor equipment whereby the distortions of the rotor
due to heat expansion during the operation of the appa
can be dispensed with. Still other objects are to provide
with ducts 22 and 24 for conducting one of the heat ex
a ball bearing assembly upon which the rotor is self cen~
changing fluids to the rotor and the other ?uid from the
tering and in which coaxial relationship between the races
rotor. End plate 16 is likewise provided with sector
and the rotor and full registering between both the races
shaped ports 26 and ‘28, aligned respectively with ports
65
18 and 29 in end plate 14 and communicating respectively
is maintained.
Another object is to provide an attachment for revolv
with ducts 3d and 32 for conducting the first mentioned
ing the rotor equipment which is inexpensive to manufac
fluid from the rotor and said other ?uid to the rotor.
Countercurrent ?ow of the two ?uids provides for most
ture, the bearing races of which are readily turned in a
efficient heat transfer and in accordance with that practice
common lathe, and which attachment is easy to install
and remove and e?icient in operation. As the bearing as 70 the apparatus illustrated is advantageously connected so
sembly is arranged at the inner periphery of the rotor
that for example cold air to be heated is admitted through
8,072,182
e1)
duct 3%) and port 26 to the bottom of the rotor and after
being heated is discharged therefrom through port
and
in the lower rails, so that no ball passes over more than
one joint at a time.
The rotatable bearing member 5‘2 is provided with a
duct 22, as indicated by arrow 34;, while hot gas to be
circumferential downwardly directed annular extension
cooled enters through duct 24 and port 2%) to flow down
wardly through the rotor and be discharged in the direc in 98 which at its lower end passes over into an outwardly
directed ?ange léltl. Said annular extension 98 forms a
tion of arrow 36 through port 2?» and duct "'2. With
diaphragm portion of sufficiently thin section in radial
such connections it will be evident that the upper end of
direction to ?ex enough to compensate for rotor distor~
the apparatus will be hotter than the lower end when in
tion without imposing undesirably high stresses on the
use and for convenience the end of the apparatus to which
?uid to be cooled is admitted and from which heated 10 ring 92. At its inner periphery the rotor 7% is provided
top thereof with a corr spending inwardly directed
fluid is discharged will be referred to as the “hot” end,
.J 132 secured to the
ltiil so that
rotor is
the opposite end being referred to as the “cold”
"it
suspended from the rotatable b~earin=7 member @2. To the
will be obvious that either the upper end or the lower end
upper end of the rotatable bearing member a disc tea
may be the hot one, so long as countercurrent ?ow is
is secured which is provided with an upwardly directed
maintained depending upon which ducts are connected to
shaft tea on which a gear wheel N8 is mounted with
the sources of supply of the diiierent ?uids.
wh ch the driving gear 11% for turning the rotor 76
To the lower end plate 16 of the casing a structural
meshes. The driving motor 112 is mounted on a vertical
framework is attached comprising two L-beams 3S and
plate 314 secured to the two beams 52 and
on the
40 running across the end plate 16 and de?n'ng simul
top of the casing and further supported by spaced stand
taneously the inner side walls of the ducts 3d and 32 and
ards lie adapted to rest on a horizontal supporting plate
further two edgewise raised plates 42 and
arranged
lit; secured to the beams s2 and 64. To shield the bear
symmetrically on opposite sides of a diametral plane at
ing Gil and the gearing 168, Kid from heat radiation from
right angles to the diametral plane on opposite sides of
the adjacent ducts ‘22 and 24, respectively, conducting the
which the ducts E36 and 32 are located. The rounded
portions 46 and 43 of the central part St? between the in heated air discharged from the preheater and the hot gas
admitted to the same and to seal them o? from entrance
ports ‘26 and 28 of the end plate 16 are connected to the
to the same of said hot media the bearing and the gearing
lower inner ends of the ducts 30 and 32, respectiveli , by
are surrounded by appropriate jacket enclosures 12d and
means of appropriately curved plates 52 and 54.
122, respectively, of which the latter may be adapted to
To the upper surface of end plate 16 an inner cylindrical
carry a lubricant for the gearing While the bearing due to
shell 56 is secured which is closed at its upper end by a
its construction can be left ungreased. Further, in order
disc 53 and serves as a hub for supporting the rotor by
to minimize the heat radiation therefrom the ducts 22. and
means of a bearing indicated generally at as the nature
21; at the hot end of the preheater as well as the inner and
of which will later be described more in detail.
outer shells 72 and 74 of the rotor are provided with heat
In order to strengthen the upper end plate 14 to the
same, two plate beam members 62 and 64‘ are secured Cl insulation coverings 124, 126 and 128, 13%, respectively.
For cooling of the bearing and protection of the same
generally in alignment with the beams 38 and
and at
from soot deposits from the ?uid passages of the pre
the centre thereof having circularly outwardly bent por
heater a continuous flow of barrier gaseous medium such
tions 66 and 63 registering with the circumference of the
hub 56.
as cool pressure air can be forced from the inside of the
The rotor encircling the hub portion 56 and indicated ‘in bearing, said stream of air for instance entering the hub
portion 56 through van aperture 132 in the central part 5%)
generally at 70 comprises an annulus having inner and
of the end plate 16 from a supply of air under pressure
outer shell Walls 72, and 74 and radial partition walls ‘76
and being admitted through an aperture 134 in the middle
dividing the space between the shell walls into sector
shaped compartments 78 which are provided at or near
of the disc 58 of the hub into the interior of the bearing
66 and departing therefrom through the interspace be
their bottoms with suitable supports as bars 84) supporting
regenerative heat exchanging plate elements 82 in ac
tween the lower and upper bearing members 84 and 92,
cordance with Well known practice.
respectively, into the clearance 136 between the hub 56
In accordance with a basic feature of the present .in
and the inner rotor shell 72 from which it is discharged
vention the rotor '76 is rotatably supported at its inner
into the passages for the heat exchanging ?uids.
periphery by the hearing so, rather than at or adjacent the 5'.
It will be noted that the mounting and demounting of
the preheater is extremely simpli?ed as all the parts there
centre or axis of rotation, the many advantages of pe
ripheral support hereinafter to be pointed out being se
of are built up on a basic supporting plate. At demount
cured by the provision of bearing construction the nature
ing of the preheater for inspection and repair the upper
and functioning of which enables the practical and eco
end plate and the shell of the casing are easily removed
nomical application of peripheral support to be obtained
while the rotor can remain standing. The bearing and
inexpensively and with not only a long life factor but also
the driving gears are light and cheap and can be turned in
relative ease or“ repair and replacement when wear does
a common lathe and further are readily accessible and in
expensive to exchange and replace.
occur.
The lower bearing member
comprises a rigid ring
The preheater according to FIG. 3 differs from the
which is provided with a load-carrying raceway 3a in the (it) construction just described mainly in that to the upper
form of an annular recess which may be cut directly in
end plate 14 of the casing is secured a ring member 138
said bearing member itself and in the corners or" which
having two downward directed annular cam ?anges 14s
are located arcuate lengths of wire 8?; providing lower
and 142, the inner of which 140 extends into a groove
144 provided in the ?ange tilt? of the upper bearing mem
rails upon which a multiplicity of ball 96 may roll.
ber $2 and the outer of which 142 extends into the inter
The upper rotatable bearing member 92 comprises a
space 146 between the rim of said ?ange lilo and an adja
rigid ring having an annular recess % forming the upper
cent annular sealing strip 148 provided on the inner
raceway for the balls 9% and registering with the lower
periphery of the rotor. By means of these ridge and
raceway 86. Additional arcuate lengths of wire 88 in the
groove portions the positions of which may be the reverse
corner of recess 94 provide upper rails engaged in roll
a labyrinth seal is provided for between the inner top end
ing contact by balls 98, the latter being held in evenly
of the rotor and the upper end plate of the casing. The
spaced relation peripherally by a retainer 96.
gear wheel 150 attached to the upper bearing member 92
The joints in the lower rails and in the upper rails
may be shrunk on the latter. The barrier cooling air for
should be staggered both with respect to each other but
the bearing is supplied from above through an opening
also the joints in the upper rails with respect to the joints
152 in the top of an enclosing jacket 15d surrounding the
3,072,182
5
6
with the lower raceway 226 on the ?ange 222. To the
gearing as well as the bearing while the hub 56 is closed
at its top 58.
ring ?ange 228 of the shell 72 of the rotor is \further
The general arrangement of the preheater shown in
‘fastened an extra bearing ring member 232 extending up
ward and having an inward ?ange 234 which on its lower
FIG. 4 is chie?y in accordance with the construction ac
cording to FIGS. 1 and 2. To a shaft 106 provided on a
surface has a raceway 236 registering with the upper race
way 224 of the ?ange 222. By means of the two super
disc 104 secured to the upper bearing member is fastened
a pulley 156 which is belt or chain driven from the driving
pulley 158. The belt or chain driven pulleys are not
imposed bearings a bearing is obtained which is very
safe from misalignment, derailing or tilting due to stresses
shielded off from the ambient atmosphere but the bearing
in radial as Well as axial directions, even if the rotor is
is surrounded by a jacket enclosure 16th and no provisions 10 built extremely light. In order to show a further alterna
tive the peripheral drive is effected by a pin rack 238
for ?ow of barrier or cooling air therethrough are made.
located at the outer periphery of the rotor on the outer
In the construction shown in FIG. 5 the bearing means
shell 74 of the rotor meshing with a driving gear (not
162 are located adjacent the lower end of the rotor 164,
the upper end of the apparatus being the hot end of the
shown). The open ends of the inner shell of the rotor
are covered by plates 24-4} and 24-2.
preheater, for example, and the lower end being the cold
FIG. 8a shows a tandem bearing similar to that of FIG.
end of the preheater as shown by means of the arrows 166
8 but in which the bearing member attached to the hub
and 168, respectively, indicating the direction of ?ow of
is that on which has the two axially most spaced raceways
the admitted hot medium and the direction of ?ow of the
instead of the bearing member attached to the rotor.
discharged heated medium, respectively. To the lower
FIG. 8a is believed to be self explanatory and not in need
end of the inner shell 72 of the rotor a disc 170 is secured
forming the upper bearing member of the bearing 162
and being provided with a downward directed extension
of further description.
172 on which a gear wheel 174 is shrunk which meshes
is not economically wor‘hwhile to utilize in practice for
heat exchange purposes and which has been referred to
hereinbefore as an inactive portion of the rotor varies in
extent but has advantageously a radius within the limits
10 to 25 inches due to the size of the preheater and pref
erably the radius of the inner shell of the rotor lies with
with the driving gear 110. The lower end plate 16 of the
casing has a central opening 176 to the inner edge of
which an annular hub 178 is secured which serves as
carrier for the lower bearing member 180 of the bearing,
and the upper bearing member 179 and the hub are pro
vided with cooperating cam ?anges and grooves to provide
for a labyrinth seal 182. Protection air is entered through
duct 184 in the cover 186 which closes the bottom of the
space containing the gearing and the bearing means.
The embodiment according to FIG. 6 di?‘ers from that
of FIG. 5 mainly in that the bearing means 138 are lo
cated adjacent the middle portion of the rotor instead of
at or adjacent the lower end of the rotor. To the inner
shell 72 of the rotor a ring 1% is attached to the lower
surface of which an annular member 192. is secured form
ing the upper bearing member. Between the confront
ing surfaces of the ring 196 and the upper bearing mem
ber 192 a heat insulation 1% may be inserted. Further,
to the underside of the ring 1% a carrier 196 for the
driven gear wheel 174 is secured which carrier 196 is
closed at its top and attached thereby to the ring 1% and
has an axially extending cylindrical wall portion to the
end of which the gear wheel 174 is shrunk upon. The
lower bearing member 198 is carried by a cylindrical sup
port 2% the lower end of which is fastened to end plate
16 of the casing. The lower bearing member has radially
spaced inner and outer annular cam ?anges 2132 and 264
engaging grooves 296 and 268 which are arranged in the
upper bearing member 192.
In the construction hitherto contemplated the structural
framework has been placed below the heat exchanger, the
casing, which as well as the hub carrying the rotor, have
been mounted on the structural framework.
However, it is also possible to let the casing and the
rotor carrying hub be suspended from a structural frame
work and such an arrangement is illustrated in FIG. 8.
The centre space of the rotor which as stated above
in 12 to 20 inches.
From the foregoing it will be obvious that the prin
ciples of the invention may be carried into e?ect ‘by
means of a Wide variety of speci?c structural embodi
ments, that various features may be combined in differ
ent Ways and that certain features may be employed to
the exclusion of others. The invention is accordingly to
be understood as embracing all forms of apparatus fall
ing within the scope of the appended claims.
What I claim is:
l. Regenerative heat exchanger of the vertical type
for gaseous media comprising a casing providing passages
therethrough for hot and cold gases, respectively, aligned
inlet and outlet ducts connected to the ends of said pas
sages to provide for ?ow of the hot and cold gases
through said exchanger, a stationary structural frame
work supporting said exchanger and including a vertically
disposed hub portion, a rotor with inner and outer shells
having the interspace therebetween ?lied with regenera
tive heat exchange material, said rotor being enclosed
within said casing and encircling said hub portion, and
bearing means for rotatably supporting the rotor solely
at the inner periphery thereof with respect to said hub
portion, said bearing means comprising two bearing
members co~axial with the rotor, one of said bearing
members being attached to said hub portion and station
ary with respect thereto, and a second one of said hear
ing members being attached to the rotor and mounted to
rotate therewith.
2. Regenerative heat exchanger as claimed in claim 1,
in which the bearing means comprises a lower support- ‘
The structural plate framework comprises two horizontal (it) ing bearing member attached to the hub portion and
T-beams 21%) and 212 similar to the beams 62 and 64 in
FIG. 2 and the central portions of which are bent in a
proper way to surround the hub arrangement 214 for the
rotor. The upper end plate 14 of the casing has a central
having an annular recess on the upper‘ side thereof co
aperture 216 for the entrance of the hub 214 carrying
the rotor, said hub comprising upper and lower portions
~ recess in the lower supporting member, arcuate lengths
of wire located in the corners of said recesses, and anti
213 and 220, respectively, fastened together detachably
triction bearing elements engaged in rolling contact with
the lower and upper rails provided by said arcuate lengths
and of which the upper hub portion is fastened to the
upper bent ends of the beams 210 and 212. The lower
half of the hub has a radially extending ?ange 222 at
its lower end which is provided with a raceway 224 on
its upper face and a coaxial raceway 226 on its lower
face. To the top rim of the inner shell 72 of the rotor
a ring ?ange 228 is secured which has a raceway 230
provided on the upper surface of the same registering
axial wi-th the rotor, an upper rotatable bearing member
supporting the rotor and having an annular recess on the
under side thereof adapted to register with the annular
of wire located in said annular recesses.
3. Regenerative heat exchanger as claimed in claim 1,
in which the hub portion is supported by the structural
framework and extends substantially through the height
of the rotor, the bearing means are attached to the top
of the hub portion and the rotor is suspended from the
rotatable bearing member.
3,072,182
8
4. Regenerative heat exchanger as claimed in claim 3,
in which an inner shell of the rotor is provided with an
inward extending ?ange and the rotatable bearing meirn
her with an outward extending ?ange, by means of which
?anges the rotor and the rotatable bearing member ar
connected with each other.
5. Regenerative heat exchanger as claimed in claim 4,
in which the rotatable bearing member transists over into
its outward extending ?ange by means of a ?exible dia
phragm portion coaxial with the rotor axis.
6. Regenerative heat exchanger as claimed in claim i,
in which means are provided for peripheral drive of the
rotatable bearing member and thereby of the rotor.
7. Regenerative heat exchanger as claimed in claim 6,
10. Regenerative heat exchanger as claimed in claim 9,
in which at least one of the hub portion and the annu
lar extension includes a ?exible diaphragm portion c0
axial with the rotor ‘axis.
generative heat exchanger as claimed in claim 1,
the hub portion and the casing are suspended
\
an upper structural framework and the hub por
tion carries the stationary bearing member, and the T0
tatable bearing member attached to the rotor is carried
by the stationary bearing member.
12. Regenerative heat exchanger as claimed in claim 1,
in which one of the two bearing members comprises two
detachable sections each provided with an annular recess‘
coaxial with the rotor and said recesses facing each other
in which a peripheral toothed rack is attached to the re
in axially spaced relation, and the second of the two
tatable bearing member and a driving gear meshing with
said peripheral toothed rack and carried by the casing
is provided for turning the rotatable bearing member and
thereby of the rotor.
8. Regenerative heat exchanger as claimed in claim 1,
in which the rotatable bearing member confronts an end
plate of the casing, one of which rotatable ibearing mem
ber and casing end plate is provided with at least one an
nular ridge coaxial with the rotor axis and the other of
which is provided with a corresponding annular groove
to receive said annular ridge in order to provide for a
bearing members having an upper and a lower recess on
labyrinth seal.
opposite sides thereof, the upper recess of the second
‘bearing member registering with the upper recess of the
first bearing member and the lower recess of the second
bearing member registering with the lower recess of the
first hearing member, arcuate lengths of Wire located in
the corners of said recesses, and anti-friction bearing ele
ments engaged in rolling contact with the lower and up
per rails by said arcuate lengths of wire located in said
annular recesses.
rteierenees (litter? in the ?le of this patent
9. Regenerative heat exchanger as claimed in claim 1,
UNITED SrATES PATENTS
in which the hub portion is supported by the structural
framework and terminates below the middle portion of
‘the rotor ‘and carries the stationary bearing, member, and
the rotatable bearing member is attached to the inner
shell of the rotor as a disc across the rotor ax‘ , said disc
being provided with a downward directed annular exten
sion which at its lower end is provided with a peripheral
toothed rack to mesh ‘with a driving gear for turning the
rotor.
2,744,731
2,803,508
Brandt ______________ __ May 8, 1956
Nilsson et a1. ________ .__. Aug. 20, 1957
649,265
1,082,683
Great Britain ________ __ Jan. 24, 1951
France _____________ __ Dec. 31, 1954
FOREEGN PATENTS
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