U.S. patent number 3,911,694 [Application Number 05/457,374] was granted by the patent office on 1975-10-14 for rotary cooling and heating apparatus.
This patent grant is currently assigned to E. I. Du Pont de Nemours and Company. Invention is credited to William A. Doerner.
United States Patent |
3,911,694 |
Doerner |
October 14, 1975 |
Rotary cooling and heating apparatus
Abstract
Rotary cooling and heating apparatus comprising a rotary housing
containing a refrigerant including a compressor and expander
coupled with an external refrigerant condenser and evaporator. The
components are disposed on a common axis with the condenser and
evaporator axially spaced at opposite sides of the housing, and the
housing, condenser and evaporator are mounted for coaxial rotation
together as a unit. Rotary power means rotationally drives the
compressor and the housing-condenser-evaporator, and an internal
occluded fixed-ratio gear train is connected between the
housing-condenser-evaporator unit and the compressor to provide
different rotational speeds for the compressor and the
housing-condenser-evaporator unit. The housing is hermetically
sealed and a torque anchor is provided for the gear train.
Inventors: |
Doerner; William A.
(Wilmington, DE) |
Assignee: |
E. I. Du Pont de Nemours and
Company (Wilmington, DE)
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Family
ID: |
27397786 |
Appl.
No.: |
05/457,374 |
Filed: |
April 2, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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316851 |
Jan 2, 1973 |
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227902 |
Feb 22, 1972 |
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Current U.S.
Class: |
62/499; 165/86;
60/669 |
Current CPC
Class: |
F01K
7/00 (20130101); F24F 5/00 (20130101); F25B
27/00 (20130101); F01K 11/04 (20130101); F25B
3/00 (20130101); F01D 25/18 (20130101) |
Current International
Class: |
F01D
25/00 (20060101); F01D 25/18 (20060101); F25B
27/00 (20060101); F25B 3/00 (20060101); F24F
5/00 (20060101); F01K 11/00 (20060101); F01K
11/04 (20060101); F01K 7/00 (20060101); F25B
003/00 () |
Field of
Search: |
;62/499,325,159 ;60/669
;122/11 ;165/86,87,88 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: O'Dea; William F.
Assistant Examiner: Capossela; Ronald C.
Attorney, Agent or Firm: Howson and Howson
Parent Case Text
This application is a continuation-in-part of my application Ser.
No. 316,851, filed Jan. 2, 1973 which is a continuation-in-part of
my application Ser. No. 227,902, filed Feb. 22, 1972, now
abandoned.
Claims
I claim:
1. Rotary cooling and heating apparatus comprising,
a cylindrical housing mounted for rotation about the axis
thereof,
a compressor mounted coaxially in the housing for rotation
therewith including a coaxial rotor rotatable independently
relative to said housing for compressing refrigerant,
a condenser mounted coaxially of the housing and rotatable
therewith comprising a plurality of axially spaced annular fins
having heat exchange tubes extending longitudinally
therethrough,
means for conducting compressed refrigerant from the compressor to
the condenser heat exchange tubes for condensing said refrigerant
therein by heat exchange with a fluid discharged outwardly through
said fins,
refrigerant expander means in said housing for expanding condensed
refrigerant received from said condenser,
an evaporator mounted coaxially of the housing and rotatable
therewith comprising a plurality of axially spaced annular fins
having heat exchange tubes extending longitudinally therethrough
and arranged to receive refrigerant from said expander,
means for returning vaporized refrigerant from said evaporator to
the housing,
means operable to rotationally drive a selected one of said rotor
and housing-condenser-evaporator unit including fixed-ratio
transmission means in the housing connected between the rotor and
said housing constructed and arranged whereby the rotor and housing
rotate at predetermined first and second relative speeds
respectively and the speed of said housing is operable to cause a
gaseous heat exchange fluid to be conveyed and accelerated by
viscosity shear forces outwardly between the fins of the condenser
and evaporator to the velocities providing optimum heat exchange
between said gaseous fluid and the refrigerant in the heat exchange
tubes of the condenser and evaporator,
and a torque anchor non-rotatable in said housing cooperable with
said transmission means for generating the necessity counter-torque
force to oppose the generated reaction torque.
2. Apparatus as claimed in claim 1 wherein the refrigerant expander
comprises at least one capillary tube having a length correlated to
the internal flow area thereof to match the refrigerant flow rate
in the capillary expander to the refrigerant flow rate through the
compressor.
3. Apparatus as claimed in claim 1 wherein the refrigerant expander
comprises a plurality of capillary tubes equally spaced
circumferentially of the housing and rotatable therewith, the
length of said capillary tubes being correlated to the internal
flow area thereof and to the number of said tubes to match the
refrigerant flow rate in the capillary expander to the refrigerant
flow rate through the compressor.
4. Apparatus as claimed in claim 3 wherein the capillary expander
tubes are operable in response to the pressure drop across said
expander tubes between the refrigerant condenser and evaporator to
automatically establish and maintain capacity balance in the
refrigerant system.
5. Apparatus as claimed in claim 1 wherein the refrigerant expander
is operable in response to the pressure drop across said expander
means between the refrigerant condenser and evaporator to
automatically establish and maintain capacity balance in the
refrigerant system.
6. Apparatus as claimed in claim 1 wherein the transmission means
comprises an occluded fixed-ratio gear train mounted coaxially
within the housing.
7. Apparatus as claimed in claim 6 wherein the torque anchor
comprises means for anchoring at least one element of the gear
train against relative rotation circumferentially about the housing
axis.
8. Apparatus as claimed in claim 7 wherein the counter-torque force
generating means comprises a pendulum member connected to the gear
and having predetermined density and dimensions operable to anchor
said gear circumferentially with respect to the housing axis.
9. Apparatus as claimed in claim 1 wherein the
housing-condenser-evaporator unit is rotationally driven by rotary
power means externally of said unit and having driving connection
thereto, and the transmission drives the compressor rotor from the
driven rotary housing-condenser-evaporator unit.
10. Apparatus as claimed in claim 9 wherein the transmission means
comprises an occluded fixed-ratio gear train mounted coaxially
within the housing.
11. Apparatus as claimed in claim 10 wherein the torque anchor
comprises means for anchoring at least one of the gears in the gear
train against relative rotation circumferentially about the housing
axis.
12. Apparatus as claimed in claim 11 wherein the counter-torque
force generating means comprises a pendulum member connected to the
gear and having predetermined density and dimensions operable to
anchor said gear circumferentially with respect to the housing
axis.
13. Apparatus as claimed in claim 12 wherein the rotary housing
includes a sump for containing an annular bath of lubricant and the
pendulum includes pump means operable to pump lubricant from said
annular bath inwardly of the housing to lubricate the transmission
means and compressor rotor.
14. Apparatus as claimed in claim 1 wherein the compressor rotor is
rotationally driven by an internal electric motor mounted coaxially
within the housing and supplied with electric current from an
external source of electric power, and the transmission drives the
housing-condenser-evaporator unit from the motor driven
compressor.
15. Apparatus as claimed in claim 14 wherein the transmission means
comprises an occluded fixed-ratio gear train mounted coaxially
within the housing.
16. Apparatus as claimed in claim 15 wherein the torque anchor
comprises means for anchoring at least one of the gears in the gear
train against relative rotation circumferentially about the housing
axis.
17. Apparatus as claimed in claim 16 wherein the counter-torque
force generating means comprises a pendulum member connected to the
gear and having predetermined density and dimensions operable to
anchor said gear circumferentially with respect to the housing
axis.
18. Apparatus as claimed in claim 17 wherein the rotary housing
includes a sump for containing an annular bath of lubricant and the
pendulum includes pump means operable to pump lubricant from said
annular bath inwardly of the housing to lubricate the transmission
means and compressor rotor.
19. Apparatus as claimed in claim 14 wherein the compressed
refrigerant discharged by the compressor rotor is utilized to cool
the internal electric motor.
20. Apparatus as claimed in claim 1 wherein the rotary housing
includes a sump for containing an annular bath of lubricant and the
torque anchor means is non-rotatable with the housing and includes
pump means operable to pump lubricant inwardly from said annular
bath to lubricate the transmission means and compressor rotor.
21. Apparatus as claimed in claim 20 comprising means for returning
to the sump lubricant migrating into the refrigerant fluid and
collected in the evaporator.
22. Apparatus as claimed in claim 21 wherein the means for
returning lubricant to the sump from the evaporator comprises at
least one tube having its inlet end connected to one of the
evaporator heat exchange tubes to receive lubricant collected
therein and having its other end disposed to discharge the
lubricant in said tube to the sump.
23. Apparatus as claimed in claim 22 wherein the lubricant return
tube has its discharge end disposed 180.degree. from the inlet end
thereof.
24. Cooling and heating apparatus as claimed in claim 1 comprising
a first stationary housing defining a plenum chamber enclosing the
condenser for receiving heated air discharged outwardly through the
condenser fins and having an axial inlet opening for air to the
condenser, a second stationary housing defining a plenum chamber
enclosing the evaporator for receiving cool fluid discharged
outwardly through the evaporator fins and having an axial inlet
opening for air to the evaporator, fresh air inlet means, duct
means connected from said fresh air inlet means to the condenser
air inlet and to the evaporator air inlet, first valve means
selectively positionable to cause air to flow from said fresh air
inlet to one of said condenser air inlet and evaporator air inlet,
heated air duct means connected to the first plenum chamber for
receiving heated air discharged through the condenser fins and
connected to an exhaust duct having an air outlet to the ambient
atmosphere and to a distribution duct leading to a remote zone to
be heated, second valve means in said hot air duct means
selectively positionable to cause heated air from the condenser to
flow to one of said exhaust duct and said distribution duct, cool
air duct means connected to the second plenum chamber for receiving
cool air discharged from the evaporator fins and connected to said
exhaust duct and said distribution duct, third valve means in said
cool air duct means selectively positionable to cause cool air from
the evaporator to flow to one of said exhaust duct and said
distribution duct, return air duct means connected to the air inlet
to the evaporator and the air inlet to the condenser, and fourth
valve means in said return air duct selectively positionable to
cause return air to flow to one of said evaporator air inlet and
said condenser air inlet.
25. Apparatus as claimed in claim 24 wherein for heating operation
the first valve is positioned to cause fresh air to flow to the
evaporator inlet, the second valve means is positioned to cause
heated air from the condenser plenum chamber to flow through the
distributor duct to the zone to be heated, the third valve means is
positioned to cause cool air from the evaporator plenum chamber to
flow through the exhaust duct to the ambient atmosphere, and the
fourth valve means is positioned to cause air in the return duct to
flow to the condenser inlet to be reheated and recirculated.
26. Apparatus as claimed in claim 24 wherein for cooling operation
the first valve means is positioned to cause fresh air to flow to
the condenser inlet, the second valve means is positioned to cause
heated air from the condenser plenum chamber to flow through the
exhaust duct to the ambient atmosphere, the third valve means is
positioned to cause cool air from the evaporator plenum chamber to
flow through the distribution duct to the zone to be cooled, and
the fourth valve means is positioned to cause air in the return
duct to flow to the evaporator inlet to be recooled and
recirculated.
Description
This invention relates to rotary cooling and heating apparatus, and
more particularly to rotary cooling and heating apparatus having a
rotary condenser and evaporator.
An object of the present invention is to provide a rotary cooling
and heating apparatus of the type described that is of compact,
unitary construction and both quiet and efficient in operation.
Another object of the invention is to provide a rotary cooling and
heating apparatus of the character set forth that is operable as a
reverse cycle heat pump to function either as a space cooler or
heater as desired and the rotary condenser and evaporator function
also as blowers for circulating the cooling or heating fluid
independently of other power sources.
Another object of the invention is to provide a cooling and heating
apparatus embodying the features set forth that can be manufactured
and shipped fully assembled, hermetically sealed and charged with
refrigerant fluid.
These and other objects of the invention and the various features
and details of the construction and operation thereof are
hereinafter set forth and described with reference to the
accompanying drawings, in which:
FIG. 1 is a typical sectional view diametrically through a rotary
cooling and heating apparatus embodying the present invention;
FIG. 2 is an enlarged fragmentary vertical sectional view
diametrically through the rotary cooling and heating apparatus;
FIG. 3 is a schematic view on line 3--3, FIG. 2 of the fixed-ratio
gear train;
FIG. 4 is an enlarged fragmentary detail view partially in section
showing the non-rotating lubricant supply conduit mounted within
the high speed rotating sun gear of the gear train shown in FIG.
3;
FIG. 5 is a fragmentary sectional view in reduced scale on line
5--5, FIG. 2 showing details of the torque anchor pendulum;
FIG. 6 is a typical schematic sectional view diametrically through
the apparatus showing an alternate arrangement of a detail of the
invention;
FIG. 7 is an elevational view partially in section on line 7--7,
FIG. 6;
FIG. 8 is a view similar to FIG. 2 showing another embodiment of
the invention;
FIG. 9 is a perspective view showing the apparatus of the present
invention with associated ducts and valving for cooling or
air-conditioning a building in the summertime or other warm
temperature climate; and
FIG. 10 is a view similar to FIG. 9 showing the duct valving
arrangement for heating a building in the wintertime or other cold
temperature climate.
Rotary cooling and heating apparatus according to the present
invention comprises a rotary hermetically sealed housing H
containing a refrigerant compressor P and refrigerant expander RX,
together with external refrigerant condenser C and evaporator E.
The components are mounted on a common axis with the condenser C
and evaporator E axially spaced at opposite sides of the housing H
and mounted for coaxial rotation with the housing as a unit about
said axis. Rotary power means are provided to rotationally drive
the compressor P and housing-condenser-evaporator unit, and an
occluded fixed-ratio gear train in the housing is connected between
the latter and the compressor to provide predetermined different
rotational speeds for the compressor and the
housing-condenser-evaporator unit.
In the embodiment of the invention shown in FIGS. 1-3 of the
drawings, and with particular reference to FIG. 1 thereof, the
rotary housing H is of generally cylindrical configuration
comprising a circumferentially extending peripheral wall 2 and
axially spaced side walls 3 and 4. The housing H is mounted for
rotation about its axis by means of shaft members 5 and 6 secured
to and extending coaxially outward from the opposite housing side
walls 3 and 4, respectively. The outer end of the shaft 5 is
journaled by means of a bearing 7 in a stationary hub 8 that is
fixedly supported by means of radial spokes 9 from a circumscribing
concentric ring 10 that in turn is fixedly supported by a standard
11 from a fixed base or support 12 of the apparatus. In similar
manner, the outer end of the shaft 6 is rotatably journaled by
means of a bearing 13 in a stationary collar or ring 14 that is
supported by means of radial spokes 15 within a circumscribing
concentric ring 16 that is in turn fixedly supported by a standard
17 from the fixed base 12 of the apparatus. From the foregoing it
will be apparent that the cylindrical housing H and the shafts 5
and 6 constitute a unitary structure that is mounted for coaxial
rotation as a unit about the housing axis.
Mounted coaxially within the housing H is a refrigerant compressor
or pump P. The compressor P comprises an annular housing structure
20 that is fixedly supported within the housing H by means of
radial vanes 22 so that the compressor housing 20 rotates coaxially
as a unit with the housing H. The compressor housing 20 defines
internally thereof a coaxial annular chamber 24 in which is mounted
a compressor rotor 26 that is keyed to a shaft 28 journaled in the
compressor housing 20 by means of bearings 30 and 32. Fixedly
secured to and circumscribing the compressor housing 20 is an
annular ring 34 having circumferentially arranged radial openings
36 therein that communicate with a corresponding plurality of
circumferentially arranged radial inlet passages 38 leading to the
compressor rotor 26. An annular refrigerant chamber 40 coaxially
surrounds the compressor P in radially spaced relation thereto and
is fixedly supported within the housing H to rotate with the
compressor housing 20 and said housing H.
In the embodiment of the invention illustrated in FIG. 1 of the
drawings, the housing H is rotationally driven at a predetermined
speed by means of an external electric motor M driving a pulley 42,
fixed on the outer end of the housing shaft 6, through a belt or
chain 44. An internal transmission is provided between the housing
H and the compressor rotor shaft 28 so that the rotation of said
housing driven by the motor M operates to rotationally drive the
said shaft 28 and compressor rotor 26 at the desired speed. In the
embodiment of the invention shown in FIGS. 1 and 2, this is
accomplished by means of an internal occluded fixed-ratio gear
train arranged coaxially within the housing H, and constructed and
operable as described in U.S. Pat. No. 3,769,796 issued Nov. 6,
1973 in the name of Max F. Bechtold.
As shown in FIGS. 2 and 3, the fixed-ratio gear train is in the
form of a planetary gear system comprising a ring gear 46 fixedly
mounted on and rotatable with the compressor housing 20 at the
rotational speed at which said housing 20 and main housing H are
driven by the motor M. The ring gear 46 drives a plurality of
compound gears each rotatably mounted by means of bearings on a
stub shaft 48 that is fixedly mounted in the adjacent portion of a
non-rotating torque anchor member T having a coaxially disposed
central hub portion 50 that is journaled on the inner end of the
shaft 5 by means of axially spaced bearings 52, 54 As shown, the
ring gear 46 is meshed with and rotationally drives the smaller
diameter gear 56 of each compound gear and the larger diameter gear
58 of each compound gear is meshed with and rotationally drives a
coaxial sun gear 60 fixedly secured on the compressor shaft 28.
The torque anchor T is held stationary with respect to the rotary
housing H by means of a pendulum portion 62 that projects radially
substantially to the circumferential wall 2 of the housing. The
pendulum is of predetermined density, dimensions and location to
generate the necessary counter-torque force to oppose the reaction
torque generated by the compressor.
By reason of the non-rotating torque anchor T one element of the
gear train, namely the compound planetary gears, are fixedly
positioned so that their axes do not rotate or move
circumferentially relative to or about the housing axis. Thus the
rotary power of the housing H is transmitted from the rotating ring
gear 46 through the compound planetary gears directly to the sun
gear 60 on the compressor shaft 28 thereby rotationally driving
said shaft and the compressor rotor 26 at the desired predetermined
speed in accordance with the fixed-ratio of the gear train to
compress the selected refrigerant such as, for example, Freon 113
or the like. On the other hand, with an internal motor such as is
shown in FIG. 8, and hereinafter described, the compressor is
driven directly and the pendulum provides the necessary
counter-torque force to oppose the external reaction torque of the
air drag in the rotary condenser C and evaporator E.
Refrigerant compressed by the rotor 26 is discharged therefrom
through a plurality of circumferentially equally spaced radial
tubes 64 to the annular refrigerant chamber 40. Compressed
refrigerant discharged from the compressor P to the chamber 40 is
condensed in the rotary condenser C. As shown, the rotary condenser
C comprises a coaxial array of annular radial fins 66 and
longitudinally extending heat exchange tubes 68 arranged
circumferentially in equally spaced relation about the rotation
axis of the apparatus and mounted to rotate with the housing H as
previously stated. The fins 66 consist of separate or independent
annular disk elements supported and secured in predetermined
equally spaced parallel relation by means of the heat exchange
tubes 68 that extend longitudinally through said fins 66. The fins
66 and tubes 68 are fabricated of metal having high thermal
conductivity and preferably the fins are bonded to the tubes to
provide maximum thermal conductivity therebetween.
The inner end portions of the heat exchange tubes 68 extend through
openings 70 in the housing wall 4 and have their ends secured in
recesses 72 in the adjacent wall of the refrigerant chamber 40 with
the interiors of said tubes 68 in communication with the interior
of said chamber 40 to receive compressed refrigerant therefrom. The
outer ends of the tubes 68 are mounted and secured in recesses 74
provided in an annular end ring 76 disposed coaxially adjacent the
outermost of the fins 66 and supported from the housing shaft 6 by
circumferentially equally spaced radial spokes 78.
The inner peripheral edges of the fins 66 define internally thereof
a coaxial inlet chamber 82 for the cooling fluid to be discharged
outwardly by and between the plurality of rotating fins as
hereinafter set forth. The inner diameters of the ring 16 and ring
76 are the same as the inner diameter of the adjacent group of fins
66 so as not to restrict the flow of fluid inwardly to the chamber
82, and an outwardly flared or bell-shaped fluid intake member 84
is fixedly mounted on the ring 16 in coaxial relation outwardly
adjacent the inlet end of the chamber 82. The inner end portion of
the housing shaft 6 is of curved generally conical shape as
indicated at 6a for streamlining flow of the heat exchange fluid
through the chamber 82 to the fins 66 of the condenser. The nature
of the flow for rotational shear force devices is completely
described by the Taylor number, N.sub.Ta, where:
N.sub.ta = d.sup.2 w/v
d = distance between fins
w = angular velocity (radians per sec.)
v = kinematic viscosity
Efficient heat exchange depends upon both the fin area and the
difference between the speed of the fins and the velocity of the
fluid flowing between them. For heat transfer, the Taylor number is
not adequate by itself to completely describe an optimum
configuration and must be determined with relation to the radio of
the inner radius to the outer radius of the fins to provide an
efficient heat exchanger.
Thus, the spacing or distance between the adjacent fins 66 of the
condenser C is determined with relation to the rotational speed of
the condenser and to the kinematic viscosity of the cooling fluid
to provide a Taylor number in the range of about 5 to 10,
preferably about 6, and the inner radius and outer radius of the
fins is determined to provide a ratio of inner to outer radii of
the fins 66 in the range of about 0.70 to 0.85, preferably about
0.77, so as to utilize the viscous properties of the cooling fluid
and the shear forces exerted thereon by the rotating fins 66 to
convey and accelerate the fluid radially outward between said fins
substantially to the velocity providing optimum total heat exchange
between refrigerant in the tubes 68 and the fluid passing between
the fins 66 in accordance with the invention set forth and
described in my co-pending application for U.S. patent filed Nov.
17, 1972, Ser. No. 307,612 now U.S. Pat. No. 3,866,668.
The outer peripheral portion of both the housing wall 4 and the
ring 76 extend radially outward beyond the fins 66 a distance to
provide annular radial flange portions F and F', respectively, that
operate to augment fluid flow outwardly between the fins 66 as
described in U.S. Pat. of Stanley B. Levy, No. 3,773,106, issued
Nov. 20, 1973. Also, longitudinal fluid flow augmentation blades of
the type and construction shown and described in said Levy patent
can be provided between the flange portions F and F' when desired
in any particular installation.
Compressed refrigerant discharged by the rotor 26 to the annular
chamber 40 flows from the latter into the heat exchange tubes 68 of
the condenser C where it is condensed by heat exchange with the
cooling fluid, for example air, discharged outwardly between the
array of fins 66 as previously described. The liquid refrigerant
thus condensed in the condenser tubes 68 flows inwardly therein to
the refrigerant chamber 40 from which it is discharged by
centrifugal force outwardly through a plurality of
circumferentially equally spaced radially extending tubes 86 and
then though a capillary tube refrigerant expander RX comprised of
at least one or a plurality of capillary tubes 88 in which the
condensed refrigerant is expanded and delivered to the evaporator E
where it is evaporated.
The evaporator E is generally similar in construction to the
condenser C previously described, and comprises a coaxial array of
annular radial fins 90 and longitudinally extending heat exchange
tubes 92 arranged in circumferentially equally spaced relation
about the shaft 5 and mounted for rotation with the housing H and
condenser C as a unit.
The inner ends of the heat exchange tubes 92 are mounted and
secured in corresponding openings 94 provided in the adjacent
housing wall 3 so that the interiors of the tubes 92 are in
communication with the interior of the housing H. An annular
distributing ring 96 having an inwardly extending annular wall
portion 98 circumscribes the inner ends of the tubes 92. The outer
ends of the tubes 92 are mounted and secured in recesses 100
provided in an annular end ring 102 that is disposed coaxially
adjacent the outermost of the fins 90 and supported from the shaft
5 by circumferentially equally spaced radial spokes 104. The outer
ends of the evaporator tubes 92 communicate with and are
interconnected by an annular manifold 106 provided in the ring
102.
Referring to FIG. 1 of the drawings, the inner peripheral edges of
the fins 90 define interiorly thereof a coaxial inlet chamber 108
for the heat exchange fluid to be discharged outwardly by and
between the plurality of rotating fins 90 in the manner previously
described in connection with the condenser C. The inner diameters
of the ring 102 and the outwardly adjacent ring 10 are the same as
the inner diameter of the fins 90 so as not to restrict the flow of
fluid into the chamber 108 and an outwardly flared or bell-shaped
intake member 110 is fixedly mounted on the ring 10 in coaxial
relation outwardly adjacent the inlet end of the chamber 108. A
curved, generally conical shaped cowl 112 surrounds the shaft 5 for
streamlining flow of the heat exchange fluid through chamber 108 to
the array of fins 90 of the evaporator E.
Also, as in the condenser C, the outer peripheral portions of both
the adjacent housing wall 3 and the ring 102 extend radially
outward beyond the fins 90 a distance to provide annular radial
flange portions F" and F'" that operate to augment fluid flow
outwardly between the fins, and longitudinal fluid flow
augmentation blades can be provided between the flange portions F"
and F'" when desired, as previously described.
As in the case of the condenser C, the spacing or distance between
the adjacent fins 90 of the evaporator E is determined with
relation to the rotational speed of the evaporator and to the inner
and outer radii of said fins 90, as previously described, so as to
utilize the viscous properties of the fluid and the shear forces
exerted thereon by the fins 90 to convey and accelerate the fluid
radially outward between the fins substantially to the velocity
providing optimum total heat exchange between the fluid discharged
through the fins 90 and the refrigerant in the tubes 92.
With more particular reference to the refrigerant expander RX, each
capillary tube 88 is connected at its inlet end to one of the
radial tubes 86 and extends radially outward to the housing wall 2,
outboard of the pendulum 62 of the torque anchor T, and then
radially inward to one of the evaporator tubes 92 of the evaporator
E where the outlet and of the capillary tube 88 is directed into
said evaporator tube 92, as shown, to discharge expanded liquid
refrigerant thereto. The expanded liquid refrigerant delivered by
the capillary tubes 88 to the several evaporator tubes 92 is
uniformly distributed by the ring 96 to the other evaporator tubes
92 except for a predetermined small number of said tubes 92 that
have their inner ends blocked off as hereinafter described.
The length and internal diameter of the capillary tubes 88 are
correlated to each other and to the number of tubes employed to
match the refrigerant flow rate in the capillary expander tubes to
the refrigerant flow rate through the compressor. This correlation
is critical and can be determined precisely for each installation
of the apparatus by a person skilled in the art of
refrigeration.
In the present invention the capillary expanders 88 and the
evaporator E are constructed and arranged so that the refrigerant
flow rate in the capillary expander tubes 88 is automatically
adjusted according to the refrigerant flow rate through the
compressor P to thereby maintain the capacity balance of the
refrigerant system. While it is preferred, in the case of high
boiling point refrigerants such as Freon 113 previously mentioned,
that the radial distance of the liquid level in the evaporator
tubes 92 from the rotation axis of the apparatus be greater than
the radial distance of the refrigerant condenser tubes 68 from said
axis as shown in FIGS. 1 and 2, this is not necessary in the case
of lower boiling point refrigerants and with some such refrigerants
the evaporator tubes 92 may be at a less radial distance from the
axis than the condenser tubes 68. In either arrangement the flow
rate of refrigerant through the capillary expander tubes 88 is
controlled by the pressure drop across the capillary expander tubes
88 which is determined not only by the difference between the
pressure of the vapor at the refrigerant chamber 40 and that of the
vapor at the evaporator distributor ring 96, but also by the
difference in liquid level between the level r in the radially
extending tubes 86 adjacent the refrigerant chamber 40 and the
level in the evaporator tubes 92.
Thus, when the compressor P delivers refrigerant at a high flow
rate, the liquid level r in the radial tubes 86 will move radially
inward therein to provide the additional pressure necessary to
drive the refrigerant through the capillary expander tubes 88 at
the proper matching flow rate in relation to the delivery flow rate
of the compressor P. Due to the amplifying effect of the
centrifugal force created by rotation of the
housing-condenser-evaporator unit, small variations in the liquid
level r will compensate for wide variations in the flow rate of the
refrigerant and the described arrangement of capillary expander and
evaporator is operable to provide a capacity balanced system for
any refrigerant flow rate from the designed flow rate of the
particular arraratus to zero flow of the refrigerant.
Incorporated in the apparatus is a force feed lubrication system
utilizing a Pitot pump such as shown in FIG. 2, and of the type
described in my U.S. Pat. No. 3,744,246, issued July 10, 1973. As
shown, the Pitot pump comprises a radial passage 110 in the
pendulum 62 and torque anchor T, having at its outer end an
L-shaped scoop 112, the inlet end of which is immersed in an
annular bath of lubricant 114 in a sump extending circumferentially
interiorly of the rotary housing H, and faces in the direction
opposite the direction of rotation thereof. Adjacent the hub
portion 50 of the torque anchor T the passage 110 divides into two
angularly extending branch passages 116 and 118, respectively. The
passage 116 conducts lubricant internally of the hub portion 50 for
lubrication of the bearings 52 and 54. The other branch passage 118
connects to the radial leg of an inverted L-shaped connector 120
that has its horizontal leg disposed coaxially within the sun gear
60 of the gear train, for example as shown in FIG. 4, and the
compressor rotor shaft 28 is provided with a coaxially extending
lubricant passage 122 having radial passages 124 and 126,
respectively, disposed for lubricating the shaft bearings 30 and 32
as well as the several gears in the fixed-ratio gear train.
Rotation of the housing H relative to the stationary torque anchor
T operates to pump lubricant from the bath 114 to the bearings and
gears as described. Lubricant from the bearings 52 and 54 drains
into an annular collector ring 128 and is returned therefrom to the
lubricant bath 114 by means of a plurality of circumferentially
equally spaced tubes 130. Lubricant drains from the bearing 30 and
the gear train into an annular collector ring 132 and is returned
therefrom to the lubricant bath 114 by a plurality of
circumferentially equally spaced tubes 134, and lubricant from the
bearings 30 and 32 is returned to the bath 114 by a plurality of
tubes 136.
It will be observed in FIG. 2, that a portion of each capillary
expander tube 88 adjacent the housing wall 2 is immersed in the
lubricant bath 114, and as the temperature of the lubricant bath
114 usually is higher than the temperature of the refrigerant in
the tubes 88, the portions of the latter passing through the bath
114 preferably are thermally insulated from the lubricant, for
example, by means of a circumscribing tubular sheath 138 of larger
diameter than said tubes 88 closed at their opposite ends and
filled with suitable insulating material 140.
As previously stated, expanded refrigerant is distributed by the
ring 96 to all of the evaporator tubes 92 except at least one or a
small number that have their inner ends closed. This one or small
number of tubes 92, for example three circumferentially equally
spaced tubes designated 92a, are closed at their inner ends by a
disk or plug 142 having a central opening therein in which is
secured the axially extending inner end portion 144 of a radially
disposed tube 146 that has its outer end immersed in the lubricant
bath 114. Lubricant that migrates into the refrigerant system will
not evaporate in the evaporator tubes 92 but will flow through
manifold 106 and collect in the several tubes 92a that are closed
against entrance of refrigerant thereto by the plugs 142. Lubricant
collecting in the tubes 92a flows inwardly therein and is returned
to the lubricant both 114 by the tubes 146. Preferably, each of the
extends 180.degree. about the internal periphery of the housing H
to prevent refrigerant from draining from the evaporator E when the
apparatus is not rotating.
An alternate arrangement for returning lubricant from the
evaporator E to the bath 114 is shown in FIGS. 6 and 7 of the
drawings. Referring to FIGS. 6 and 7, this alternate arrangement is
essentially similar to the arrangement previously described except
that the opening in each disk or plug 142' for the inner end
portion 144' of the tubes 146' is located adjacent the radially
outermost inner surface of the tubes 92a so that the inner end
portions 144' of said tubes are entirely immersed in the
refrigerant in the tubes 92a and the tubes 146' are sized so as to
provide a continual bleed of entrained lubricant from the
evaporator tubes 92a thereby preventing an excessive accumulation
of build-up of lubricant in the evaporator E.
Any refrigerant migrating through the tubes 146 and 146' to the
bath 114 will be vaporized since the temperature of the bath is
well above the evaporator temperature although at the same
pressure. Refrigerant vaporized from the bath 114 joins the
evaporated refrigerant returned to the housing H from the
evaporator E.
In normal operation of the described cooling and heating apparatus,
the motor M drives the housing-condenser-evaporator unit at a
predetermined speed of rotation and the latter through the internal
gear train drives the compressor shaft 28 and rotor 26 at the
desired speed of rotation relative to the speed of the
housing-condenser-evaporator unit determined by the fixed-ratio of
the gear train. In the embodiment of the invention shown, the
direction of rotation of the shaft 28 is opposite the direction of
rotation of the housing-condenser-evaporator unit.
The evaporator refrigerant in the housing H enters the compressor P
through openings 36 and passages 38, is compressed by the rotor 26
and discharged through passages 64 to the annular refrigerant
chamber 40. The compressed refrigerant then enters the heat
exchange tubes 68 of the condenser C where it is condensed by the
cooling fluid discharged outwardly between the condenser fins 66 as
previously described. The condensed refrigerant returns to the
annular chamber 40 and is discharged through the tubes 86 by which
the expanded refrigerant is delivered to the tubes 92 of the
evaporator E. The refrigerant is evaporated in the tubes 92 and
then returns to the housing H to be again compressed, condensed,
expanded and evaporated as described.
A typical example of a rotary cooling and heating apparatus
embodying the invention comprises a compressor having an effective
diameter designed and operable to compress the selected refrigerant
from the evaporated pressure to the condenser pressure. The fins 66
of the condenser C have an outer diameter of 13 inches and an inner
diameter of 10 inches. The axial length of the array of fins 66 is
9 inches and the spacing between adjacent fins is 0.028 inches with
the axes of the heat exchange tubes 68 disposed at a radius of 5.75
inches from the rotation axis of the apparatus.
The fins 90 of the evaporator E have an outer diameter of 14 inches
and an inner diameter of 11 inches. The axial length of the array
of fins 90 is 6 inches and the spacing between adjacent fins is
0.025 inches. The axially extending evaporator tubes 92, 92a are
disposed at a radius of 12.5 inches from the rotation axis of the
apparatus.
The housing-condenser-evaporator unit is rotationally driven by the
motor M at a speed of 2400 r.p.m. and the pendulum 62 made of steel
in the configuration shown in FIG. 5 has an inner radius of 6.5
inches, an outer radius of 10 inches, a width of 2 inches, an arc
length of 60.degree. and weighs 17 pounds. The pendulum provides
counter-torque force sufficient to hold the torque anchor T
stationary and prevent rotation thereof against a reaction of 8.5
ft. lbs. which is the torque required to drive the compressor shaft
28 and rotor 26 from the rotary housing through the fixed-ratio
gear train.
Using 1,1,2-trichloro-1,2,2-trifluoroethane as the refrigerant, the
specifications of a typical operation of the described apparatus
are as follows:
Condenser saturation temperature (.degree.F.) 130. Condenser
pressure (psia) 18. Condenser load (Btu/hr) 36,700. Condenser air
flow (cfm) 1,540. Evaporator temperature (.degree.F.) 40.
Evaporator pressure (psia) 2.7 Evaporator load (Btu/hr) 26,800.
Evaporator air flow (cfm) 1,625.
The present invention is not limited to cooling and heating
apparatus in which the housing-condenser-evaporator unit is
rotationally driven by an external source of rotary power such as
the motor M. Alternatively, the compressor shaft and rotor may be
rotationally driven by an internal source of rotary power such as
an electric motor mounted within the rotary housing H and an
internal fixed-ratio gear train employed to drive the rotary
housing-condenser-evaporator unit from the compressor shaft.
One embodiment of such an alternative arrangement is shown in FIG.
8 of the drawings. Except for the several structural differences
hereinafter described, the apparatus shown in FIG. 8 is otherwise
identical to the first embodiment of the invention previously
described and, accordingly, elements and parts in FIG. 8 that are
identical to elements and parts in the first embodiment are
identified by the same reference letters and numbers to avoid
unnecessary repetition of description thereof.
Referring to FIG. 8 of the drawings, an electric motor M' is
mounted coaxially within the rotary housing H and comprises a
stator 150 and a rotor 152 having a coaxial shaft 154. The motor
stator 150 is fixedly supported within the housing H for rotation
therewith by means of a tubular housing 156 and a plurality of
circumferentially equally spaced radial struts 158. Secured at
opposite ends of the stator 150 are end plates 160 and 162,
respectively, having openings for the shaft 154 in which said shaft
is rotatably mounted by means of bearings 164 and 166.
The motor M' is operated by electric energy supplied with 3-phase
alternating current through a three wire conductor 168 from a
conventional slip-ring arrangement comprising a plurality of
rotating contacts 170 and a corresponding plurality of fixed
contacts 172. The rotating contacts 170 are carried by the outer
end portions 174 of the housing shaft 6a journaled in the fixed hub
14a by means of bearing 13a, and the contacts 172 are mounted in
the stationary hub 14a as shown.
The sun gear 60 of the fixed-ratio gear train is fixedly mounted on
the inner end of the rotor shaft 154 and the ring gear 46 of said
gear train is mounted in an annular recess 168 in the inner face of
the motor end plate 160. The compound gears 56 and 58,
respectively, mesh with ring gear 46 and sun gear 60 as previously
described. Thus, with the pendulum 62 holding the torque anchor T
stationary the rotary power of the motor shaft 154 is transmitted
by the sun gear 60 through the compound gears 56 and 58 to the ring
gear 46 on the motor end plate 160, thereby rotationally driving
the latter and the housing-condenser-evaporator unit at the desired
predetermined speed in accordance with the fixed-ratio of the gear
train.
A compressor P' is mounted coaxially within the tubular motor
housing 156 outwardly adjacent the end plate 162. The compressor P'
comprises an annular housing 176 and a rotor 178 fixedly mounted on
the outer end portion of the motor shaft 154 and rotationally
driven thereby. The compressor housing 176 defines an annular inlet
180 to the rotor 178 and an annular diffuser 182 and manifold 184
for the refrigerant compressed and discharged by the rotor 178.
Compressed refrigerant discharged by the rotor 178 to the manifold
184 flows axially inward through a plurality of circumferentially
equally spaced passages 186 formed in the motor stator 150 and
thence outwardly through a corresponding plurality of radial tubes
64 to the annular refrigerant chamber 40 from which it is condensed
in the condenser C, expanded in the capillary tubes 88, and
evaporated in the tubes 92 of the evaporator E, all as previously
described. Flow of the compressed refrigerant through the stator
passages 186 also functions to cool the motor M'. Evaporated
refrigerant returned to the housing H from the evaporator tubes 92
flows in a path indicated by the arrows to the inlet 180 to the
compressor P where the refrigerant is again compressed, condensed,
expanded and evaporated as previously described.
Apparatus embodying the present invention is well-suited for
cooling or heating the interior of buildings, homes and other
enclosed structures utilizing reverse cycle heat pump operation,
and typical arrangements thereof for summer and winter operations
are shown in FIGS. 9 and 10, respectively, of the drawings.
Referring to FIGS. 9 and 10 of the drawings, apparatus embodying
the invention is shown with associated ducts and valves arranged
for cooling and heating a building, respectively. Preferably, the
apparatus is located adjacent a wall or walls of the building for
convenient access to the atmosphere outside the building such as,
for example, adjacent the corner of two side walls 190 and 192 of a
building, as shown.
In the arrangements shown, air from outside the building is
admitted through a duct 194 and then directed either through a duct
196 to the condenser inlet or through a duct 198 and duct 200 to
the evaporator inlet, depending upon the operative position of a
suitable shutter valve 202 being provided for the purpose. A
stationary housing or plenum chamber 204 encloses the rotary
condenser C and air admitted to the condenser is discharged
outwardly through the condenser fins where it is heated by heat
exchange with the refrigerant being condensed in the condenser
tubes.
The heated air discharged from the condenser into the plenum
chamber 204 is discharged therefrom through a duct 206 and then
either through a duct 208 and duct 210 to the outside of the
building, or through a duct 212 and duct 214 to suitable heat
outlets 216 appropriately located throughout the building,
depending upon the operative position of a suitable shutter valve
218. Air supplied to the building through outlets 216 as described
is returned to the apparatus through a duct 220 and then directed
either through a duct 222 back to the inlet to the condenser C, or
through the duct 200 to the evaporator inlet, depending upon the
operative position of a shutter valve 224.
A stationary housing or plenum chamber 226 encloses the evaporator
E and air supplied to the evaporator through duct 200 is discharged
outwardly through the evaporator fins where it is cooled by heat
exchange with the refrigerant being evaporated in the evaporator
tubes. The cooled air discharged from the evaporator into the
housing 226 is discharged therefrom through a duct 228 and then
either through a duct 230 and duct 210 to the outside of the
building, or through the ducts 212 and 214 for discharge through
the building outlets 216 to cool the building, depending on the
operative position of a suitable shutter valve 232.
For summer or cooling operation of the apparatus, as shown in FIG.
9, the valve 202 is positioned so that all of the outside air is
directed through the duct 196 to the condenser inlet and the valve
218 is positioned to cause all of the heated air discharged from
the condenser through duct 206 to be directed through ducts 208 and
210 and discharged to the exterior of the building. Also, the valve
224 is positioned as shown to cause all of the building air
returned through duct 220 to be directed through duct 200 to the
inlet to the evaporator where it is cooled as described and
discharged from the housing 226 through the duct 228, the shutter
valve 232 being positioned to cause all of the cooled air
discharged from duct 228 to be directed through ducts 212 and 214
and discharged through the outlets 216 to thereby cool the
building.
For winter or heating operation of the apparatus, the several
valves 202, 218, 224 and 232 are positioned as shown in FIG. 10 so
that operation of the apparatus is essentially the reverse of that
described for cooling a building. Thus, in the arrangement shown in
FIG. 10 the outside air is caused to flow through ducts 198 and 200
to the evaporator where it is cooled and discharged through ducts
228, 230 and 210 to the exterior of the building, whereas all of
the building air returned through duct 220 is directed through duct
222 to the condenser where it is heated and discharged through
ducts 206, 212 and 214 to the outlets 216 to heat the building. Of
course, as the outdoor air temperature decreases the heating
capacity of the condenser (heat pump) will be reduced, and
consequently in extreme cold temperatures it may be necessary to
supplement the heat delivered by the condenser by an appropriate
amount of resistance (electric) heating.
From the foregoing it will be observed that the present invention
provides novel rotary cooling and heating apparatus that is of
compact unitary construction and can be manufactured and shipped
fully assembled, hermetically sealed and charged with the desired
refrigerant fluid. The apparatus provides isenthalpic expansion of
the refrigerant fluid with automatic control of the capacity
balance of the refrigerant system, and the rotary condenser and
evaporator function also a blowers for circulating the cooling and
heating fluids independently of other power sources thereby
providing an apparatus that is quiet and efficient in
operation.
While certain embodiments of the present invention have been
illustrated and described, it is not intended to limit the
invention to such disclosures and changes and modifications may be
made and incorporated as desired within the scope of the
claims.
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