US2911189A

US2911189A - Fluid machine

Info

Publication number: US2911189A
Application number: US369260A
Authority: US
Inventors: Ohain Hans J Pabst Von
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-07-20
Filing date: 1953-07-20
Publication date: 1959-11-03
Anticipated expiration: 1976-11-03

Description

Nov. 3, 1959 H. J. P. VON OHAIN FLUID MACHINE 4 Sheets-Sheet .1 5.43

Filed July 20, 1955 AWTO/ENEYS 1959 H. J. P. VON OHAIN 2,91

FLUID MACHINE Filed July 20, 1953 4 Sheets-Sheet 2 HTTOE VEYS Nov, 3, 1959 J, vo oH l 2,911,189

FLUID MACHINE 4 Sheets-Sheet '3 Filed July 20. 1953 .m R w m VN mw 3 8 T J L G 5 W A 1 5 V. 8 N B 7 w w m 7 a w 9 0 r u 7 V 0 f /0 fi W 43 /F 4v, w L M .Q N 0: 0 0 w r a m, w U 4 J 7 4 Fm Nov. 3, 1959 I H. J- P. VON OHAIN Filed July 20, 1953 FLUID MACHINE 4 Sheets-Sheet 4 Mum.

HTTOENEY 5 FLUID MACHINE Hans J. Pabstvon Ohain, Brookville, Ohio Application July 20, 1953, Serial No. 369,260

3 Claims. (Cl. 253-91) (Granted under Title 35, US. Code (1952), sec. 266) This invention may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to fluid machines and more particularly to fluidmachines of the type capable of being operated as a pump, a compressor, or a turbine characterized in the utilization of high pressure coeflicients and low values of volume flow per second resulting in extremely low values of specific revolutions per minute making such machines very useful for small applications. Inthe present invention only two primary parts are used, a stator housing and a rotor in the housing. Be-

United States Patent tween the periphery of the rotor and the housing is a ring channel or annular passage which is blocked over a short portion of its circular extent by a battle extension on one of the two primary elements. Inlet and outlet ports enter, fone each, on opposite sides of the bafile extension. The primary element not having the baffle extension thereon 'has vanes or buckets thereon facing inwardly in the ring channel and in close relation to the baflie extension whereby fluid passing from the inlet to the outlet will cause rotation 'of'the rotor in the case of a fluid motor or turbine, or in the case of a pump or compressor the fluid will be drawn'in'through the'inlet port and forced outthrough the outlet port. The vanes or buckets are shaped as high resistance nozzles to ofler the greatest resistance to fluid "flow whereby the rotor speed will very nearly approach that of the fluid flow. These vanes or buckets may be designed to oifer resistance to fluid flow in either direction so that the same machine may be operated as a motor or a compressor, or perform both functions at the same installation. The rotor and housing may be cooled where the fluid machine is to operate under heat conditions. The inner surfaces of the primary elements may also have a ceramic coating placed thereon to protect metal portions exposed to hot fluids. The two primary ele- 2,911,189 Patented Nov. 3,1959

lCe

r Fig. 5 is a cutaway cross-sectional view of still another type of vane or bucket structure;

Fig. 6 is a cutaway cross-sectional view of a further modification of vane or bucket structure;

Fig. 7 is a partial cross-sectional view of a cooling construction of the rotor assembly;

Fig. 8 is a cross-sectional view of the fluid machine in several stages;

Fig. 9 is a top plan view of the multi-stage fluid machine of Fig. 8 showing the intake and outlet manifolding;

' Fig. 10 is a longitudinal cross-sectional view of a modification of the fluid machine with some structural parts shown in dashed lines; 1

Fig. 11 is a cross-sectional view of the housing of Fig. 10 taken along the lines 3--3 with the rotor therein shown in elevation; and

Fig. 12 is a longitudinal cross sectional view of a twostage fluid machine following the modification structural design of Figs. 10 and 11.

Referring more particularly to Figs. 1 and 2, there is shown a construction of the fluid machine of this invention in its simplest form. A stator housing consisting of two similar companion halves 20 and 21 houses a rotor 22 made of two

disk members

23 and 24. The external. appearance of the housing 20 may be of any desirable configuration but is preferably circular to conserve material. The housing has concentric journal flanged end openings 25 and 26. Each companion half housing has a

cylindrical bore

27 and 28 which are aligned to provide a cylindrical chamber in which the rotor 22 is free to rotate. In each journal flange opening 25 and 26 is a frictionless type bearing 29 and 30, respectively, of well known construction which supports in the inner race respectively a shaft extension 31 on the rotor disk member 23 and a shaft extension 32-on the rotor .disk member 24. A bearing retainer and cap 33 is detachably fixed to the journal flange 25 as by screw threads, cap screws, or the ments may be made in plural arrangements to provide av plurality of stages, where desirable. It is therefore a general object of this invention to provide a highly eflicient fluid motor or turbine, pump or compressor by increasing the efiectiveness in the vanes or buckets to resist fluid flow thereover and so positioning the vanes, the inlet, the outlet, and the baflie extension between the inletand outlet to produce rotor speeds corersponding to the velocity of the fluid flow from inlet to outlet.

These and other objects, advantages, features, and uses will become more apparent as the description proceeds when taken in consideration of the drawings, in which:

-Fig. 1 is a side elevational view of the fluid machine with dotted lines indicating some of the internal structure;

Fig. 2 is a longitudinal cross-sectional ,view of the machine taken along the line 2-2 of Fig. 1;

Fig. 3 is a cutaway cross-sectional view of one type of -vane or bucket structure;

'of vane or bucket structure;

like, while .a bearing retainer 34 on the other journal flange 26 has a concentric opening 35 therein to allow the shaft extension 32 to pass to the exterior of the housing 21. The shaft extension 32 may be used as an input or output shaft, depending on whether the device is to be used as a pump or motor in a manner later to be described. The

bearings

29 and 30 may each be held in position on the shaft extensions by snap rings 36 as is well known in the art. The housing 2021 has two

ports

37 and 38 substantially radially entering the cylindrical chamber 27-23, the two ports being separated by a wall 39 that extends inwardly past the wall of the cylindrical chamber 2728 to form a battle extension 40. The wall 39 and baffle extension 40 may be made integral 'with one of the companion housing members but is preferably a separate part with means to be assembled by the portion 39 on one of the companion housing members. As may :best be realized in the drawing, the wall 39 becomes progressively wider with graceful curves as it progresses towardthe center of the housing and the baflie extension 40 also becomes progressively thinner for reasons presently to be explained.

The rotor 22, as before stated, is made preferably of two

disk members

23 and 24 to expedite machining operations which members may be joined in any well known manner as by screws, bolts, or the like. Near the outer periphery of each rotor disk member is an annular channel 45 on the inner face thereof with radial vanes or buckets 46 equidistantly spaced .therearound. The vanes 46 extend outwardly only partially across the annular channel .45 with the outer edge thereof slightly inclined from a true normal through the axis of the rotor which, in the assembled form of the rotor 22, provides an open peripheral ring channel.47 interrupted only, by the-bafiie CI'OSS-SBClliOIIlS of several V3116 constructions.

is substantially symmetrical.

projection 40 of the housing. As best seen in Fig. 2., the inclined edges of the vanes 46 match the tapered faces of the baflle projection 40, the rotor and housing parts being constructed with close tolerances between the relatively moving parts. The baffle projection 40 should extend a sufficient circumferential distance in the ring 'later be better understood.

. Referring to Figs. 3 to 6, inclusive, there is shown Figs. 3 and 4 show vane constructions that enable the fluid machine to be used as either a motor or turbine or as a pump or compressor since the housing and rotor design The vanes 46:: and 46b may be positioned in alignment across the ring channel 47 as shown in Fig; 4 or staggered as shown in Fig. 3. For the vane constructions shown in Figs. 4, 5 and 6 it is preferable to position the vanes in alignment across the ring channel 47. It. is particularly preferable for the vane constructions shown in Figs. 5 and 6 to be used since these vanes are designed for the greatest mutual blade interference to fluid flow in only one direction. While the spacing and distances of the vanes are not particularly critical, it has been found that the ratio of the distance between the vanes in the same disk member to "the average distance between the vanes across the ring channel 47 should amount to about 1.5 plus or minus 25% and that the ratio of the height of each vane to the distance between vanes in the same disk member should be about 0.35 plus or minus 25% for producing the best type nozzle between the opposite vanes providing resistance to flow around the ring channel -47. The vanes 46c of Fig. 5 or 46d of Fig. 6 provide good resistance to flow through the ring channel 47 but the vane structure shown in Fig. 5 is preferred. It has been found that in the structure shown in Fig. 5 the best results are obtained when the toe of the vane is sharp and the slope immediately progressing from the heel of the vane to the toe of the next adjacent vane is about 60 degrees, plus or minus degrees, from a line normal to the rotor'faces. Thus,

high resistance nozzles are formed between opposed vanes.

Assuming for the purpose of example that the vane types 46a or 46b are used, either

port

37 or 38 could be used for the inlet or the outlet and either rotative direc tion of the rotor 22 can be obtained in the operation of the fluid machine either as a motor or as a pump or compressor. As a motor, fluid under pressure is introduced into one of the

ports

37 or 38 which will flow out of the other port carrying the rotor around in the same direction. Power may be taken from the shaft 32. A considerable pressure differential will exist between the inlet port and the outlet port which will result in a slight spilling of the fluid around the rotor within the housing which will cause some objectionable friction and gap losses which can be reduced proportional to the clearance tolerances of machining and thereby rendered negligible. The fluid normally by-passing the baflle projection 40 by remaining in the spaces or pockets between the vanes causes some friction and gap losses but these losses are negligible in relation to the high efliciency of the whole device. It is of importance to note that the peripheral lip 48 of each rotor member at the outer ends of the vanes 46 helps to reduce peripheral friction and gap losses to a minimum.

' If the vane design of 460 or 46d is used, for example with the upstanding points or portions pointing clockwise as seen in Fig. l, fluid under pressure would be introduced into the port 37 to provide a fluid motor in which the -rotor 22 would be rotated counterclockwise. Used as a pump or compressor, the shaft 32 would be driven ;clockwise (as seen in Fig. 1) which would cause fluid to be drawn in the port 38 and forced out the port 37. A Where the fluid machine is to be used as a turbine utilizing hot fluids to drive the rotor, a cooling construction as shown in Fig. 7 may be made to cool the rotor and vanes. The companion housing 21 is provided with a thickened portion 50 near the bearing flanged opening 26 through which passes two

passages

51 and 52. The cap 34 extends over these passages and has corresponding

passages

53 and 54 with internal threads therein for connection to conduits (not shown). On the back face of the rotor disk 24 is an annular channel 55 near the periphery with a plurality of radially extending blades 56 equidistantly spaced about the channel. Also in the outer wall of the rotor disk 24 are two concentric

annular channels

57 and 58 that exactly match in radial distance the

passages

51 and 52, respectively. The channel 57 is in fluid communication with the annular channel 55 at v the outermost portion thereof by a plurality of passages 59 while the channel 58 is in fluid communication with the innermost portion of the channel 55 through a plurality of passages 60. The open face of the channel 55 is covered by an annular plate 61, the plate 61 being detachably fixed to the disk member 24 in any well known manner. Coolant introduced into the passage 54 will pass through the

passages

52, 58, and into the annular channel 55 between all the blades 56 and out through the

passages

59, 57, 51, and 53. The centrifugal action of the blades 56 will draw the coolant into the channel 55 and the thermo-siphoning action resulting from the fluid being heated will cause the coolant to rise toward the center of rotation and out as described above. I While the construction of cooling illustrated in Fig. 7 may be used, other equally eflicient well known cooling means may be used, as a centrifugal air fan means.

Where hot fluids are used, it may be more desirable to coat the annular channel, vanes, and rotor with ceramic material than to provide a separate cooling system, or both ceramic coating and a cooling system may be used.

The fluid machine is readily adapted to be produced in stages as shown in Figs. 8 and 9. The housing 65 has the usual rotor bearings 66 and 67 at opposite ends thereof as well as bearings 68 and 69 concentrically arranged in

wall divisions

70 and 71 of the housing 65. A rotor assembly, generally referred to by the reference character 72, is journaled in the bearings 66, 68, 69, and 67 with a shaft 73 extending out of the housing 65. The particular manner of assembly is not shown but the housing 65 may be made in two longitudinal half sections and assembled together over the rotor assembly in a manner well known in the art. As may be seen in Fig. 8, the rotor assembly is constructed of several disk parts to produce the several stages. The first stage consists of

rotor disk parts

74, 75, 76, and 77 in which 74 is similar to the disk member 23 of Fig. l. The disk members 75 and 76 have annular channels 45 in opposite peripheral faces thereof and the disk 77 has an annular channel 45 in only the inner face thereof so that in the assembled condition three ring channels 47 are formed. Also like that of Fig. 1 a wall 39 with a baflle extension 40 extends into each ring channel 47. These three units of ring channels and baflle extensions within the left end wall and the wall division 70 provides the first stage.

The disk member 77 has a journal extension 78 connecting another disk member 79 providing the first member of the first unit in the second stage. A disk member 80, corresponding to the member 75 and 76, lies between the disk member 79 and a disk member 81, the latter disk member being similar to the element 7779'by having a journal 82 and a disk member 83. The

disk members

79, 80, and 81 provide a second stage of two units there being the annular channels on opposite sides of the two baflie extensions 40.

The third and last stage is a single unit having the disk member 83 fixed to a disk member 84 on which is fixed the shaft 73. The baffle extension 40 is positioned between the vaned annular channels 45 as before. An inlet manifold 85 is connected in parallel to the inlets (for -"e xample'in explaining the device as a fluid'motorlof all three units in the first stage. The outlets of all three units in the first stage are connectedin parallel which are fluidly connected through a manifold 1 '86 to the inlets in parallel of the two units in the second stage. The two ioutlets of the secondstage are connected in parallel to ibeienfound that the number of units or ring channels for each stage should decrease from stage to stage in accord- Iance with the increasing density of the fluid. Also, multifs't'age machines are necessary for-higher pressure ratios. A'ipre'ssure ratio, of approximately 2:1 represents the limiting pressureratio for asingle stage but these pressure ratios may be 5:1 in a multi-stage machine.

l -The multi-stage fluid machine just described can be produced with the vane or bucket construction as shown in Figs. 3 to 6 to provide a pump or compressor, or a motor or turbine. It is believed that the operation of the multi-stage fluid machine is clear from the description of operation of the single stage machine of Figs. 1 and 2 and further description of operation will therefore not be given.

Referring now more particularly to Figs. 10, 11 and 12 there is shown cross-sectional views of a single stage fluid machine in Figs. and 11, and a cross-sectional view of a multi-stage fluid machine in Fig. 12, all three figures representing two modifications of the fluid machine of Figs. 1 to 9. In the modification of Figures 10 and 11 the housing is made in

companion sections

90 and 91. Each section has a large

central opening

92 and 93, re spectively, and in each opening is a bearing

cup

94 and 95, respectively, supported by spider means 96 and 97. In the portion of the composite housing 9091 between the openings is an annular channel 98 or cylinder inner chamber enclosed by an outer peripheral cylindrical wall and flat end walls forming the sides of the chamber with vanes or buckets 99 equidistantly spaced on the walls around this annular channel. are closed by an overhanging lip 100 extending from each companion housing into the annular channel. The companion sections of the housing are held together in any suitable and well known manner.

The rotor 105 has a journal shaft extension 106 in the bearing cup ,94 and an opposite, aligned shaft 107 extending out through the bearing cup 95. The rotor 105 is of a diameter that the periphery thereof extends to, but not into, the annular channel 98 except for an extended baffle portion 108 which just clears the outer edges of all the vanes 99 with a tolerance consistent with machining operations. The rotor 105 has one fluid passage 109 connecting the circular area about the cup 96 with the annular channel 98 on one side of the extended baflie portion 108 and it has another passage 110 fluidly connecting the circular area about the cup 97 and the annular channel 98 on the other side of the extended portion 108. Used as a pump or a compressor the rotor, as viewed in Fig. 11, will be driven by shaft 107 in a counterclockwise direction causing fluid to be drawn in through passage 109 and forced out through passage 110. The

openings

92 and 93 are readily adapted to be connected to conduit means where desirable or feasible. The rotor 105 is balanced dynamically, the

passages

109 and 110 being of a size to offset the added weight of the extended portion 108. Used as a motor or turbine, the

fluid under pressure would be introduced through the passage 110 and exhausted through the passage 109 causing rotor rotation in a clockwise direction whereby power may be taken from shaft 107.

As shown in Fig. 12 this modification can be produced in a plurality of stages by doubling, tripling, etc., the housing divisions 115 which has wall divisions 116 separating the annular channels 98 and extension portions.

The ends of the vanes 99 i 3 and features.

The rotor is-modified to the extent that separate rotor portions are produced corresponding in number to the annular channels and may be made integral or in separate'pieces as'machining operations or costs dictate. It is necessary, however, that a passage '117, corresponding to passage 110 in Fig. 11, connects the annular channel 1980f theflsecond stage on the same side of the baffle projectionas' the passage 109 in the first stage.

The passage 110fluidly'connects the annular channel 98 in the last stage to the circular opening 93 as in Fig. 10 wherein like reference characters represent like elements As may be seen in Fig. 12 the second stage is smaller-than the first stage to make allowance for the --increasing-density of the fluid. The vanes or buckets 99 used' in'i'the single stage machine ofFig. 10 are used the 'mi'Jlti-stage machine and the multi-stage machine may be driven through shaft 107 to provide a pump or compressor, or driven by fluid to provide-a motor or turbine in the same manner as the machine of Fig. 10.

While many modifications and changes may be made in the various constructional details and features to produce the same results, it is to be understood that the drawings and description merely set out illustrations of the invention and I desire to be limited only in the spirit and scope of my invention as set out by the appended claims.

I claim:

1. In a machine of the fluid drag type, a casing having a cylindrical outer wall and parallel spaced side walls defining a cylindrical cavity, a rotor including a shaft rotatably journalled in said casing, a hub on said rotor positioned in said cavity andleaving a cylindrical annular chamber extending radially outward therefrom, a circumferential equally spaced row of vanes extending laterally into said annular chamber from each of the side walls thereof, the corresponding vanes in each row being in register with the vanes in the other row and inclined at an angle from the plane of the corresponding sidewall, said vane rows having at least portions thereof laterally spaced apart to leave an annular vane free channel there between, a sector shaped bafile on said rotor blocking off a portion of said annular channel, a fluid port in each of the radial end faces of said baffle, means connected to one of said ports for admitting fluid under pressure into said annular channel and means connected to the other of said ports for discharging fluid from said annular channel, the inclination of said vanes being such as to offer a'high resistance to the flow of fluid from the inlet port to said discharge port.

2. In a machine of the fluid drag type, a housing ele-' ment and a rotor element rotatably journalled in said housing element, a hub on said rotor element, said hub and said housing element defining an annular chamber extending radially outward from said rotor hub, two rows of circumferentially equally spaced vanes mounted on one of said elements, the corresponding vanes in each the two rows of vanes having at least portions thereof laterally spaced to form a vane free channel therebetween, the vanes in each of said rows being shaped to form pockets therebetween which create a high resistance to fluid flow in one direction in said vane free channel therebetween by mutually redirecting the fluid entering the pockets in a direction opposite the direction of flow in the channel, a fluid blocking baffle on the other of said elements and completely interrupting flow continuity in said vane free channel, said baflie having a passage formed therein for admitting fluid into said vane free channel on one side thereof and said baflie having an exhaust passage therein for exhaust of fluid on the opposite side thereof, the high resistance to flow of fluid in said vane free channel causing relative rotation between said housing element and said rotor element.

3. In a machine of the fluid drag type, a casing having a cylindrical outer wall and parallel spaced side walls defining a cylindrical cavity, a rotor includingv a shaft rotataby journalled in said casing, a hub on said rotor positioned in said cavity and leaving a cylindrical annular chamber extending radially outward therefrom, sets of vanes rimming the side walls and outer Wall of said annular chamber, the vanes in each set being equally circumferentially spaced and the corresponding vanes in each set being in register and equally inclined in the same direction, the outer edges of said vanes bounding a central annular vane free channel in said annular chamber, a sector shaped bafile on said rotor blocking 01f a portion of said annular channel, a port in each of the radial end faces of said bafile and communicating with said annular chamber, a pair of passages formed in said bafiie each respectively connected to one of said ports in the baffle end face and terminating at its otheriend in a port formed in one of the end faces of the rotor hub, separate fluid channels in said casing in respective continuous communication with one of said last named ports, means 8 for admitting fluid to one of said fluid channels :and for discharging fluid from the other of .saidchannels.

References Cited in the file of this patent UNITED STATES PATENTS 715,152 Roeske Dec. 2, 1902 768,884 OBrien Aug. 30; 1904 988,990 Fisher Apr. 11, 1911 1,024,363 Richardson Apr. 23, 1912 1,418,040 Trane i May 30, 1922 1,640,591 Bornernan 'Aug. 30, 1927 1,652,659 Brady Dec. 13,1921 2,073,014 Jennings Mar. 9, 1937 2,113,116 I McMillan Apr. 5, 1938 2,458,128 Alterio Jan. 4, 1949 2,640,678 Andresen June 2, 1953 FOREIGN PATENTS 373,232 Great Britain May v17, 1932