US1642454A - Pump, compressor, or the like - Google Patents

Description

v. w. MALMSTROM PUMP, COMPRESSOR, OR THE LIKE Filed May 19, 1926 5 Sheets-Sheet l Lvgmm 4/ /40 zlwvznto'c Ilalm 5 Tm: m

attoz waif Sept." 13, 1927. ,454

V. W. MALMSTROM PUMP, COMPRESSOR, OR THE LIKE Filed May 19. 1192s 5 Sheets-Sheet 2 amulet,

Vat-LE) W Malmstrum 1,642,454- p v. w. MALMSTROM PUMP, COMPRESSOR, OR THE LIKE Filed May 19. 1926 5 Sheets-Sheet 5 stantially on the line 2-2 of, Figure l thru one of the shafts of the improved device;

Patented Sept. 13, 1927.

UNITED STATES 1,642,454 PATENT OFFICE.

vamo w. mnus'rzaom, or BAYONNE-NEW JERSEY.

ruur, courn'nsson, on rm: LIKE.

Application filed May 19,

This invention relates to improvements in apparatus for the pumping of fluids, either liquid, air or gaseous, and which may be utilized as-a pump or compressor in the 5 preferred instance, but which by a reversal of the fluid when the sameis acting as a pressure medium may provide a motor or prime mover for operating any suitable mechanism.

The primary object of this invention is the provision of an improved mechanism, such as a pump, compressor or the like, which embodies a novel rotary pumping having a plurality of vanes a apted to oooperate "in. novel manner with certain sta- .tionary parts of the mechanism for efiecting a continuous and well regulated suction or' flow'of fluid through the housing.

A further object of this inventlon is the 2 provision of an improved rotary type of 'pump or compressor, comprising a balanced arrangement of rotary pumping units by which to most effectively eliminate end thrust upon a rotary shaft and bearings.

A further object of this invention is the provision of a rotary t e of pump, compressor, or motor, embodying a pan of shafts u hn each of which are supported a palr oi rotors, the rotors of'one shaft cooperating in an intermeshingrelationwith the'rotors of the other shaft; free of contact with each other and cooperating in a novel relationwith stationar details of, the housing, to ;prevent leak o the operating medium or the 85 medium being pumped. 1

.A further object of his invention isthe provision of a rotary type of pump or com ressor, embod g a compact arrangement y reason of tl i e novel formationpf rotor Other objects and advantages of this invention will be apparent during the course of the. following etailed description. In the accompanying drawings, forming a art of this specificatiornand wherein simiar reference characters designate corresponding parts throughout. the several'views, Figure 1- is avertical sectionaLview taken longitudinallythrough the improved device.

Fi ure 2 1s a sectional view taken-subshowing the details'thereof. Figure 3'is a horizontal sectional view taken thru the improved'device, along an upper shaft, substantially on the line 8-3 ;by any suitable fluid medium.

1926. Serial No. 110,275.

of Figure 1, sh'owin coo eratin housin and rotor details. g p g g Fi re 4 is a sectional view taken. substantially on'the line 44 of Figure 3. Figure 5 is a sectional view similar" to Figure 4, showing a .difierent arrangement of the rotor vanes than that illustrated in Fi re 4. a

lgures 6, 7 and- 8 are sectional views taken substantially on their respective lines n Figure 1 of the drawings.

Figure 9 is a perspective viewof a supporting core embodied as a part of the improved device. p p liligure 10 is a perspective, view of a rotor uni Figure 11 is a perspective view of another rotor unit of the improved device.

' F1gure. 12 1s a perspective view of supporting core different than that illustrated upper and lower-shafts C and D. e'u'pper shaft 0 preferably rotatably supports rotor umts E and F in. the housing B, for pum mg cooperation -with the units G and respectively, which are carried by the lower shaft p.

Wh1le the. specification and'claims of this appl cation a pump, compressor, or motor ma be specifically referred to, it is comprise astatlonary housing B, rotatab y su porting .tobe 'distmctly understood. that such terms are usedonly'for the purpose of giving nomenclature to the parts, and are-not to be construed in a limiting sense, since the..im-' proved apparatus ma be utilized for the purpose 0 pumping quick as well as air.

or uses; may beused as a compresaorfor flui s;' or may be 'used as a motor, operated 'I he-houeing'B ferably amam body portion tom arcuated wal s. 21 $110.22, struck from top and botthe centers on which the'shafts G and are supported in the housing B, and providing ,a compartment 23 in the body portion'be tween said walls 21 and 22, wherein the four rotor units E and F, G and H are rotatably mounted on the shafts C and D, as will be subsequently described. As before mentioned the main body portion is open at the opposite side thereof, and along the marginal edges at said'sides, the body portion 1s provided with the outwardly extending attaching flanges 25 and 26, adapted to detachably receive bolts 27 for the securing of end plates 30 and 31 over said open ends of cooperate, as wi be subsequently described. Of course, this web 34 is provided with su1table openings therethrough for receivin the shafts G and D and other features 0 the improved device, as is well illustrated in Fi ure 1 of thedrawings. I

t diametrically opposed sides of the compartment of the main body 20 the latter'is provided with upwardly sloping tubular extensions 36 and 37, having lnlet ports or passageways 38 and 39 respectively therein,

which slope downwardly fromthe outer ends of the extensions 36 and 37, for communication at the lower ends of said assagewa s with the compartments 23" an 23 in t e housing B, as is illustrated in Figures 3 and 6 of the drawings. As is illustrated in Figure3 the web 34 at each side of the housing asses across the passageways 38 and 39, to

ivide each of said passageways or ports immediately at the entrance of the same to the compartments 23' and 23", so that the fluid medium entering the passageway 38, .will be divided at 41 and 42 as illustrated in Figure 3 of the drawings, for flow into the compartments 23" and 23 respectively, and likewise at the passageway 39 the web portion'34 divides the said passageway into portions 43 and 44 for the compartments 23' and- 23 respectively; The upward slope of the pamageways 38 and 39 from their communication with the com artment of the housing, as illustrated in Figure 6, provides an important feature in connection. with the tra of certain liquid medium therein, when suc is being used as an operating medium or as a medium which is being operated upon,

to permit the settlement of such liquid to cross thintermeshing zone of the rotors of the upper and lower shafts, to obviate the ings. The bracket arms 48 and '49 are prefflerably integral with theplatrs 30 and-3l,

extending horizontally outwardly therefrom at the upper and lower ends of said plates 30 and 31, and the bracket members 46 and 47 are elongated and at their ends secured in.

detachable relation by screws or bolts 50 to said arms 48 and 49. Each bracket member 46 and 47 supports a pair of the anti-friction bearings 45, which may be of the roller bearing or ball hearing as illustrated. Each of the bracket members 46 and 47 for the accommodation of-each anti-friction bearing v 45 is recessed inwardly of its outer side to provlde a bearing pocket 52 over which detachable closure caps 53 may be secured at the outer sides of the bracket members 46 in ggder to seal the bearings within the pocket Each bearing 45 preferably comprises an outer race 56 mounted rather loosely in the pocket of the bracket member 46 or 47, as the case may be,and an inner race 57 snugly mounted on the respective shaft C or D;

anti-friction members, such as balls 58 being placed between the said inner and outer races in order to support the ends of the shafts C and D- in an anti-friction relation with respect to the housing B, as can readily be understood from Figure 1 of the 1 drawings.

It is preferred to adjust the shafts C and,

D longitudinally in order to properly position the rotor units E, F, G and H, which are keyed with said shafts. To this end the shafts C and D immediately outwardly of the bearings 45 are screw threaded at 60,

for adjustably receiving-nuts 61 thereon, so

that by adjustment of the nuts 61 against the inner races of the anti-friction bearing 45, the-shafts C and D may be longitudinal liy adjusted in the housing, to the desired egree to best position the rotor units E, F, G and H, so that they will bear ,vvith the least frictional engagement with. the housing B. The nuts 61 it should be noted are also located in the compartments which enclose the bearings 45, sot-hat the caps 53 must be removed in'order to adjust the nuts 61 and consequently the shafts C and D.

The upper shaft 0 extends thru the upper portion of the compartment 23, on an axis located above the inlet' and outlet passageway portions 41 to '44 inclusive, and

this shaft has rotatably keyed therewith the rotors E and-F at opposite sides of the web -ments.23 and 23 and of course at opposite sides' of the web 34; said rotor units respectively cooperating with cores 75 and 76 which are stationary with the housing B and located'in the lower. portions of the compartment 23 and 23 in the relation of parts to be subsequently described. indetall. Referring to the rotor units E and F e which are carried by the shaft C in the upper parts of the compartment 23 and 23 respectively, each of said units is of the form illustrated in Figures 1 and 10 'of the drawings, comprising" a ring-shaped hub portion 80, having a. passageway 81 therethrough for receiving the reduced end 82, of the shaft C; a key groove 83 being provided along the passageway 81 for receiving a key 84 by means of which to key the rotor unit upon the'shaft C. At one endof the hub portion 80, the same is annularly flanged outwardly at 85 in an integral relation, and projecting fromthe op ositeside of the flange 85 with respect to ta hub, 80

are provided segmental shaped'vanes 86 and 87, in uniform circumferentially spaced relation about the axis of the rotor; said vanes 86 and 87 being preferably at exactly diametrically o posed locations with respect to the axis of rotation of the rotor unit; and the opposite edges 88 of said ' vanes 86 and 87 being disposed in planes radial with respect'to the axis'of rotation of the rotor unit, and as illustrated in Fig- .ure 6 of 'the drawings. It is to be noted that the said vanes 86, and 87 are of segmental form in cross section transversely of the axis of rotation, and each of said. vanes being of uniform thickness at any location thereon, providing outer convex surfaces and inner concave surfaces, which are respectively adapted to cooperate 1n a shdmg lsealed relation upon the inside surfaces of the walls of the housing B and the exterior convex surface of the core 70.

The core 70, has been detailed in Figure 9 of the drawings, and. the s'ame'comprises an elongated tube formed-intermediate its ends with an annular integral flange 90, to divide the same into end tubular portions 91 and 92 at opposite sides of the said flange 90; the former being the longer. The web 34 in the u per portion of the compartment 23 is provided with an opening 93 therethrough and it is recessed at 94 inwardly of the side which faces the compartment therewith core '70, which is bolted in place to the housing B by means of bolts 100 secured to the web 34 as illustrated in' Figure '1. The

longer tubular portion 91' of course extends thru the opening 93 and projects int-o the upper portion of the compartment 23' where the same extends between the vanes 86 and 87; the latter at their facing concaved sides preferably bearing on the portion 91 in a fluid sealed relation thereon.

The shaft C of course extends thru the passageway 97 of the core 70. The portion 92 of the core extends at the opposite side i of the supporting web 34 from the core portion 91, and projects into the space between the vanes 86 and 87. of the rotor unit F; the

vanes at their concave sides bearing on the portion 92 in a fluid sealed relation thereon.

An important feature in the placement of the rotor 'u'nits E and F is the fact that their hubs'80 rotatably extend into" openings 98 "provided in the end plates or walls 30 and 31 of the housing B, and the outer sides of said hub portions are thus exposed at the outer sides of the end walls 30 and 31, for receiving suitable sealing ring constructions 101 by means of which to seal thebearing juncture of the rotors E and F on the end walls 31 and 32, and which sealing ring, constructions 101 will scribed.

The provision of the hubs'80 at the o posite sides of the body portion of t e rotor units E and F from the vanes 86 and 87 enables a proper thickness of hub to be provided in a non-interfering relation with the v'anes; the laterincident to such construction being placed as-close together as posslble, so that a very compact rotor unit is provided which may attain maximum efiicieney. without considerable bulk.

Spacmg sleeves 105 are rovided about the shaft ends 82 between t e hubs80 and the bearings 45 adjacent thereto. j

The rotor unit G in the .lower portion of be subsequently dey the compartment 2 3" is preferably integral mental in formation, and. which are uniformly spaced circumferentially of the rotor for the same distance. These segments 107 and 108'are' of the same formation as the vanes-or segments .86 and 87 and preferably of the same thickness, havin outer convex sides and inner concave si es respectively in sliding abutment with the inner walls of the housing B and the outer circumference of the supporting core 75 which is illustrated in Figure 12 of the drawings as a detail. It is to be thus noted that the shaft D really constitutes the hub portion for the rotor G, since the hub 109 of saidrotor G is really rigid or integral with the shaft D. V

The rotor H is detailed in Figure 1]. of the drawin s and comprises a substantially ring-shaped? or disc-body portion. 110, having a central opening 111 therein for receiving the shaft D'therethrough; this disc portion. 110 being adapted to abut up against the opposite side of the web 34 from the rotor unit G, and having openings 112 therein for receiving bolts 113 by means of which the said rotor unit H may be connected in the hub portion 109 of the rotor unit G, to rotate the rotor units G and H together upon rotation of the shaft D, as is readily apparent from Figure 1 of the drawings. The rotor unit H includes the segmental vanes 115 and 116, which are diametrically disposed in a uniformly spaced relation circun'iferentially of the rotor, and which have outer convex and inner concave facing surfaces.

As is illustrated in Figure 12 of the drawings, each of the supporting cores 75 and 76 includes a substantially cylindrical shaped portion 115 having a passageway 116 therein, which receives the shaft D therethrough; this tubular portion 115 at an end thereof being provided with a laterally extending segmental flange 118, adapted to abut against the inner side of the end wall 30 or 31,-as the case may be; the flange 118 being provided with transverse openings 119 for receiving bolts or screws 120 by means of which the said supporting cores 75 and 76 are connected in a stationary relation with the housing B, in the lower portions of the compartments 23 and 25 respectively, so that the concaved surfaces of the vanes 107 and 108 of the rotor unit G- slidably bear on the outer surface of the portion 115" of the core 7 5, and the inner concave surfaces of the vanes 115 and 116 of the rotor H slidably bear on the outer circumference of the cylindrical portion 115* of the core unit 76.

In referring to the cooperative relation of the rotor units E and G in the compartment 23, it is to be noted that the vanes of said units face in opposite directions from their respective hub portions, and the-vanes of the rotor units E and G intermesh, that 18, the vanes of the unit E enter the spaces between the vanes of the unit G during the rotation of said units, due to rotation of the shafts C and 1).; The vanes of said units E and G in arcuation are referably 75 of a circle, more or less, so t at it be seen that during the rotation of the rotors in the compartment 23', the end s1n-- faces of-the vanes of the two rotors will rotors.

eeann;

be spaced from each other, as is clearly evident from Figure 6 of the drawings.

The cylindrical shaped portion 91 of the supporting core longitudinally at a side thereof is grooved or recessed at 120, to provide a concave surface, which is struck from a radius equal to the radius from the center of the rotor Gr to the outer convex surface of the vanes 107 or 108, and. which cavity 120 inwardly of the outer. convex surface of ,the tubular portion 91 of'the core 70 is for the purpose of receiving the segmental vanes 107 and 108 of the rotor G therein during the rotation of the said rotors E and G in the compartment 23", to provide an effective sea-l during the rotation of said In similar manner the outer convex circumference of the cylindrical portion 115 of the core member is concavely recessed at 125 longitudinally thereof; the concave surface of this recess 125 being struck upon a radius which is equal to the radius from the center of the rotor E to the outer surface of one of the vanes 86 or 87 of the same, and so that the outer surfaces of said vanes 86 and 87 may slide over the concave surface of said recess 125 during the rotation of the rotors E and G, to rovide an effective seal to prevent loss of uids. By so recessing the core portions upon which the rotors E and G operate a surface seal is provided during the rotation of said rotors, which pres vents communicating pressure between the entrance and exit ports of the housing B, and

insures that the pumping or operating efficiency of the rotors is continuous and not intermittent. v

The core portions 92- and 115 ,of the supporting cores 70 and 76 are provided with' longitudinal recesses or grooves 127 and 125 therein in manner similar to the grooves of the supporting cores as above described, for similar cooperation with the vanes of the rotor units F and H, for providing a fluid-tight seal between the entrance and exit ports of the compartments 2%) wherein said rotor units F and H operate in a cooperating relation.

It is to be noted that the end thrust due to the pumping of fluid will take place in both directions oneach of the shafts C and D, due to the fact that each of said shafts supports a pair of the rotor units whose thrusts are in opposite directions along the shafts, and thus com ensating and obviating the necessity of t irust bearings.

The princi 1e of this invention in connection with on y a pair of the meshing? rotor units is preferably feasible, and the double revision of rotor units on each shaft may be dispensed with, since this is merely pro vided for a pump with large capacity, or considerable power, or in case where and thrust bearin need not be provided.

The shafts C and D' are connected for synchronous drive at the same speed by means of gears 130 and 131 keyed thereon; said gears being of the same size and in meshing relation at one end of the housing exteriorly' of the supporting bracket memrotor units E and F, the special type of sealing ring construction 101 is provided, which comprises a ring portion 135 bolted at 136 to the outer surface of each of the end walls and 31, circumferentially about the shaft C; said ring portion 136 providing an,

inwardly facing annular flan e 137, against which the outwardly facing edge of a spring urged ring 138 engages. The spring urged ring 138 is of the formation illustrated in opening 98 of the end wall ofthe housing,

Figure 13 of the drawings, being reciprd cably received within a suitable annular groove formed inwardly of the outer surface of the end walls 30 and 31, concentric with the shaft C; said rings 138having barrel shaped projections 140 thereon with sockets 1 41 therein opening only at the sides which face the bottom of the grooves 144 in which which the ring 138 is provided. In these sockets 141 compressed springs 145*are, provided, which at one end engage the end walls 30 or 31 as the-casemay be, and at the o posite end engaging against the end wa s provided by the sleeves 140 of the ring 138, to force the latter outwardly into margin abutting relation with the annular flange 137 which is rigid with the housing B. A pin 146 is keyed or rigid with the rotor E or F, as the case may be, and enters one of the sockets 141 to cause a rotation of the sealing ring member 138 with the rotor. Due

to the fact that the ring portion 135 is attached at the outer side of the mounting of the hub 80, which has a sliding fit in the and the ring portion 138 is at the opposite side of said mounting, leak of compression past the bearing of the hub portions of the rotors E and F on the housing B is prevented.

In order to prevent leak ofcompression along the shaft D outwardly beyond the ends of the rotors G and H and beyond the apertures in the walls 30 and 31 thru which the shaft 1) extends, sealing ring constructions grooves provided inwardly of the outer surfaces of the end walls 30 and 31; said ring portions 141 being spring urged and of the same general construction as the ring port'ions 138 above described, and at their outer annular edges being urged into sealing engagement with the annular edges of rin I the drawings; said spacing sleeves being" disposed about the reduced ends of the shaft D.

As to operation, if the passageway 38 is usedas an inlet, the rotors will operate'as illustrated in Figures 4 and 5 of the drawings, to draw the medium thru the ,inlet 'port 38;*the chisel edge of the web portion 34 which faces in the passageway 38 dividing the stream of the fluid so that it will flow into thepassageway ports 41 and 42 into each of the chambers'23 and 23, due to the operation of the intermeshing vanes of the rotary units in each of said compartments 23 and 23?. It-is to be noted that the width of the vanes are substantially smaller than the width of-the spaces in which they mesh,- so that the end surfaces of'the intermeshing vanes are in spaced relation and they may be flat, radial, or any shape desired, so that for the purpose of providing a seal between the inlet and outletports of the improved pump 0r compressor, it is not important to have the end surfaces of the vanes of the intermeshing rotors in sliding or any other engaging relation, and this is very important, since very often foreign materials have a tendency to ass thru themechanism and if the end surfaces of the vanes are in abutting relation, the foreign materials very often metal, will cause a wedging and possibly breaking ofthe parts of the rotors, and even parts of the housing.

The vanes of the rotor units fit snugly against the adjacent stationary parts of the housing B and cores at the centers of said rotor units, and the said rotor vanes due to the cooperationof the same on the cores of the complement rotor, do not meet anyother sealing gaskets or means, since surface Sealthe inlet and outlet ports, yet the spaced intermeshing of the vanes permits of an efficient draft thru the chambers of the housing, for sucking air or other fluid medium from the' intake for discharge thru the exit ort. p The fact that the rotor units of the shaft D are assembled to a common disc with vanes facing in opposed directions, andas the complement double rotor of the shaft C has the vanes facing inthe same direction, a very compact rotor construction for the improved device is provided, which tends towards coming-contact is effected at all times between pactness and eificiency in operation, as well as ease of assemblage and disassemblage of parts.

The improved mechanism is very-durably constructed, without delicate parts, to serve as a prime mover, pump, compressor or the like, and the same is ideal for the pumping of fluids of great viscosity.

The fact that the vanes of the rotors are equi-distant and circumferentially spaced about the hub or body portion of therotor insures that the rotor will be effectively balanced both statically and dynamically, during rotation, doing away with all eccentric tendencies which are apt to cause vibration and leak of the fluid operating or eing operated upon. The places where leakage 1S to be expected between the housing or stationary parts and revolving parts are equipped with the special seal rings which are preferably made of metal or other material to provide an .efiicient seal, and these rings have a spring take up arrangement to compensate for wear. Whatever compression does leak past the vanes, in the nature of air, gas'or liquid, will pass thru suitable conduits 150, which are connected with ducts which communicate with the spaces nearest to the seal rings; said-conduits being connected at their opposite ends with the suction passageway of the improved device, to prevent loss of the medium being operated u on.

The fact that the vanes are not in contact obviates the requirement of machining the same, nor does any fine adjustment of rotors have to be effected;

The fact that the end brackets 46 and 47 are detachable, enables all parts of the mechanism to be readilydetachable from opposite ends of the housing B, as is readily apparent.

, or minor longitudinal adjustments of the shafts G and D, clearances of from three to six thousandths of an inch may be provided between the housing and end surfaces of-the rotor. The bearing caps 53 are provided with annular pilot rings 53 which bear against the outer edges of the outer races of the ball bearing to hold the shafts and rotors against axial movement. It is apparent that by adjusting the bearing ca 53, which may have some clearance with respect to the adjustment bracket of the housing, the outer races may be adjnstedtotake u any end lay of the shaft and to pro cry a just t e same with respect to the ousing and rotors.

Various changes in the shape, size, and

arrangement of parts may be made to the form of invention herein shown anddescribed, without departing from the spirit of the invention or the scope of the claims.

I claim: 1 In a device of the classdescribed the means i combination of a housing having a compartment therein provided with inlet and exit ports, a pair of shafts rotatably mounted on the housing to extend thru said compartment, individual stationary cores carried by the housing concentrically about each of said shafts and within said compartment, and a rotor keyed for rotation with each of said shafts, each of said rotors includinga plurality of vanes, with the vanes of one rotor in a complementary intermeshing relation with the vanes of the other rotor, the outer surfaces of the vanes and the cores being formed to provide a sealing surface contact between the intake and exhaust ports during rotation of-said rotor.

2. In'a device of the class described the combination of a housing having a compartment therein, a phirality of shafts 1o tat-ably supported by the housing extending thru the compartment, said housing having intake and exhaust ports to the compartment, a stationary substantially cylindrical shaped core carried by the housing about each of said shafts and extending trans- 'versely across said compartment, each of said cores having a grooved depression inwardly thereof facing'the other shaft core, the said groove depressions being disposed transversely of the compartments and being arcuated so that the center of arcuation of the depressions of each of said cores is concentric with the shaft on which the other core is mounted. and'rotor units rovtatably supported in the housing with vanes extending into said compartment in a fluid sealed relation, the vanes of one unit being adapted to alternate with the vanes of the other rotor during rotation of said rotors and the outer surfaces of the vanes being convex and adapted to slidably pass through the depressions of said cores during rotation to provide a fluid seal between the intake and exhaust -ports.

3. In a device of the class described thev combination of a housing having a compartment therein, a plurality of shafts rotatably supported by t e housing extending thru the compartment, said housing having inlet and out-let ports to the com artment. sta tionary substantially oylin rical shaped cores carried by the housing about each of said shafts and extending transversely across said compartment, each of said cores having a grooved depression inwardly thereof facing the other shaft core, the said groove depressions being disposed transversely of the compartments and being ardepressions of each of said cores is concentric with the shaft on which the other core is mounted, and rotor units rotatably supported in the housing each havin a pair of spaced vanes extendin into said compartment in a fluid sealer? relation, the vanes cuatedso that the center of arcuation'of the Y of each unit being adapted to alternate in non-engaging relation with the vanes of the other rotor during rotation of said rotors, the outer surfaces of the vanesbeing convex and adapted t sIidably pass through the depressions ofsaid cores during rota-- tion to rovide a fluid seal between the inlet' and out et ports.

4. In a rotary device of the class 'described the combination of a housing having a a sair' of compartments therein, and inlet outlet port openings for each compartmerit, a pair of shafts rotatably supported by the housing extending thru each of said compartments, in a spaced relation, a rotor mounted on each shaft in each compartment,

the rotors of the shafts in each compartment having vanes thereon of substantially segmental formation and adapted to alterate in a meshing non-engagin relation during rotation of the same in t eir compartment to create a suction in-the compartment for drawin fluid from the inlet port and discharging it through the outlet port, the rotors of each shafthaving the va'nes' thereof positioned to place the end thrusts on the shaft in opposed directions to counter balance any end thrusts upon said shaftsi In a; rotary device of the class described the combination of a housing having a pair of compartments therein and inlet and outlet port means for each compart ment, .a pair of shafts rotatably supported by the housing extending thru each of said. compartments, in a spaced relation, a rotor mounted on each shaft in each compartment,-the rotors of the shafts in each compartment having vanes thereon of substantially segmental formation and adapted to alternate in a ,meshing non-engaging rela-- tion during rotationof the same in their compartment to create a suction in the compartment for drawing fluid from the inlet port means and discharging it through the outlet port means, the rotors of each shaft having the vanes thereof positioned to place the end thrusts on t e shaft in opposed directions to-counter alance any end thrusts upon said shaft, and anti-friction means rotatably supporting said shafts in said housing for longitudinal adjustment tomove the rotors to a ipredetermined extent across their respective compartments.

6. In a rotar device of the class described the combination of a housing having a compartment therein, and inlet and outlet port means to the compartment, 'a shaft rotatably supported in the housing having means to longitudinall adjust the shaft across the compartmen, a rotor keyed on the shaft at an end of the compartment having segmental shaped vanes extending into the compartment, a second shaft, means mountin the second shaft in the housing for longitudinal adjustment thru the compart having vanes laterally extending therefrom of segmental formation adapted to intermesh 1n the spaces between the vanes of the other rotor during rotation of said shafts and rotor's, the vanes bein so positioned that they face in opposite irections from their respective locations of attachment upon their shafts. i-

7. In a rotary device of the class demribed a housing having a compartment therein and inlet and outlet ports to thecompartment, a pair of shafts, means rotatably mounting said shafts on the housing for substantially parallel extension thru said compartment, rotors keyed uponeach of the shafts, each of thetrotors havlng a hub por- I tion and spaced vanes extending from a side of the hub portion substantially parallelwith the respective shafts, the vanes of one rotor being adapted toenter between the liquid seal rin construction carried by the shaft of the ot er rotor and the housing to prevent leak of fluid from the compartment past the ends of said rotors and shafts.

8 In a rotary-pump the combination of a 10 supporting housing having a compartment therein and inlet and outlet ports to the compartment, a pair of shafts rotatably supported bythe housing extending thru the com artment, a pair of rotors keyed on each 1 of t e shafts in the com artment, the said rotors of each shaft aving segmental shaped vanes extendingin opposite directions longitudinally of the shaft from the connections of said rotors on the shafts, the

rotors and vanes bein so positioned that the vanes of the rotors of one shaft alternate in the spaces between the vanes of the rotors of the other shaft during rotation of said shafts, and means cooperating with said rotors and the vanes thereof to provide a fluid seal between the inlet and outlet ports upon rotation of the rotorsand shafts.

9. In a rotary pump of the class described the combination of a supporting hofusing having a compartment therein and inlet and outlet port means therefor, shaftsrotatably supported by the housing and extending into said com artment, rotors keyed on each, of the shafts in a rotary relation within the compartment of the housin each of said rotors including vanes with t e vanes of one shaft alternating in the aces between the vanes of the rotor of anot er shaft, and seal tary parts of the shaft and rotor to prevent leak of fluid pressure from the compartment.

10. In a. rotary pumpof the class described the combination of a supporting housing having a compartment therein and inlet and outlet port means therefor, shafts rotatably supported-by the housing and extending into said compartment, rotors keyed on each of'the shafts in a rotary relation within the compartment of the housing, each of said rotors includin vanes with the vanes of one shaft alternating in the spaces between the vanes of the rotor of another shaft, seal rings supported by the housing and the rotary parts of the shaft and rotor to prevent leak of fluid pressure from the compartment, and spring means cooperating with said seal rings'to-normally maintain them effective and to compensate for wear thereon. a

11. In a rotary pump the combination of a housing having a compartment therein and inlet and outlet ports, a pairof shafts rotatably supported by the housing extending into the compartment thereof, rotors rotatably supported by the housing and shafts having spaced vanes thereon with the vanes of one rotor of one shaft cooperatingin the space between the vanes of the rotor of the other shaft, thevanes being so disposed that during rotation of the rotors they will create a suction in the compartment for drawing fluid from the inlet port and passing it throughout'the outlet port of the com partmcnt, and sealing means at the juncture of the rotary partsof the rotors andjshafts with the stationary parts of the housing, each of said sealing means comprising a stationary ring carried by a stationary part of the housing and a'rotary ring keyed to the rotary part of the housing, and spring means cooperating to force the said stationary and rotary rmgs of the sealing means into a sealing engagement at all times.

l2.v In a rotary pump the combination of a housing having a compartment therein and intake and discharge passageways communitating intermediate the upper and lower ends of the compartment, said passagewa 's sloping from their communication with'tie compartment in adirection upwardly to the outer ends of said passageways remote from the compartment, whereby to provide inlet and outlet ports in substantially horizontal ali nment intermediate the upper and lower en s of said compartment, a pair of shafts rotatably carried by the housing in superposed relation across said compartment, a rotor rotatably carried by one shaft in the newness being in alignment with inlet and outlet] communication of the ports with the compartment.

13. In a rotary pump the combination of.

a housing including a body portion having a compartment therein open at the ends of the body portion of the housing, a web transversely extending thru the compartment of the body portion between the open ends of the said body portion to subdivide thecompartment into a pair of chambers at opposite sides of said Web, cover plates detaohably mounted over the open ends of the compartment to enclose the chambers, shafts rotatably supported by said cover plates in an anti-friction relation in substantially parallel relation to each other transversely extending thrueach of said chambers, a pair of rotors rotatably carried by one of saidshafts-each including a hub portion keyed to the shaft at a location within the area of the cover plates, saidrotors having vanes extending from said cover plates inwardly into the upper portions of the chambers of the housing, a stationary tubular core carried by the housing web providing cylindrical shaped tubular portions extending into each of the chambers at opposite sides of said web into the central spaces between. the vanes of the above mentioned rotors, each of said cylindrical shaped portions of the core having longitudinal grooves therein, a pair of rotors connected to the other shaft at the web of the bodyportion of the housing and having spaced vanes extending in opposite directions from said web a into each of the chambers of said body portion of the housing, cores connected'with the cover plates each including cylindrical portions extending about the last mentioned shaft in each of the chambers between the vanes of the last mentioned rotors, the rotor vanes of one of the shafts being positioned in spaced relation so that the same will enter into the spaces between the vanes of the rotors of the other shaft during rotation of said shafts, last mentioned cores having longitudinal grooves therein, and the vanes of each of the shafts being adapted to slide in a surface and fluid sealing relation across the grooves of the cores of the other shaft during r0- tation of said rotors and shafts.

VAINO W. MALMSTRUM.

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