US1974112A - Rotary pump - Google Patents

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L. v. @HNSQN ROTARY PUMP 7 Sheets-Sheet l Filed March' 14, 1932 @WENEN E Semo E89 E934@ v L v. JHNSQN 399745332 ROTARY PUMP Filed Maron. 14, 1952 7 sheets-sheet 4 Filed March. 14, 1932 'r shams-'sham` 5 Sept. 18, 1934. 1 V, JQHNSONy 1,974,112

. Filed Maren 14, 1932 fr eeeee S-shet e Sptl 18, 1934. 1 vg JQHN'sN 1,974,112

l ROTARY PUMP Filed Marcn'm', 1932 7 sheets-sheet 7 .5. efozaon.

Patented Sept, l, i3d4 Ten.

Application March ld, 31.932, Serial No. 598,772

d @Balma (@l. lil3-138) y My invention relates to rotary pumps and more 1narticularly to vrotary pumps ci non-centrifugal ype. n The objects o my invention are to provide a u device of this class which will produce more line pressure for a given amount of operating power than any pump now known; which will pump a greater volume of fluid for a given size of pump and a given amount of operating power than any l@ pump known; which will be more positive in action and will produce a greater per cent of operating eiciency than any pump now known; which will be simple in construction, having few moving parts to become worn; the worn parts of which may be l easily and quickly replaced at a comparatively small expense; which will be strong and durable; which will require no priming when a liquid is being conveyed; which will pump either liquids or fluids such as air, gas and the like, and which will operate with less vibration than any pump of equal capacity now used.

The invention isl illustrated inthe aecompany= ing drawings and will be hereinafter fully described, the novel features being particularly de d5 ncd in the appended cls.

In the drawings, Figure l is an elevation of the pump with one end removed, showing the rotor and impeller blades therein, I

Fig."2 is a transverse vertical section, li'ig. 3 is a longitudinal section on the line 3&3 of Fig. 2, the line 2-2 indicating the plane or the section shown in Fig. 2,

Fig. e is a perspective view of the rotor, Fig. 5 is a diametrical section ci the rotor, the impeller blades being omitted,

Fig. 6 is a view of the inner side ci one side wall of thezhousing,

Fig. l is a perspective view or one of the rotor sections, I lo Fig. 8 is a plan view o one ei the impeller blades, Fig. 9 is an edge view of the saine,

Fig. lo isv an enlarged section on the line illle of Fig. 8, i is Fig. 1i is an enlarged section on the line lilll of Fig. 9,

Figs. l2 and 'i3 are diagr views of the bore in the housing and the guide cani, showing their development and relation.

5a The casing or housing of the pump consists er e circumferential well i and end walls 2 and 3 which are rigidly secured to opposi edges o2 the Ywall l by bolts inserted through marginal portions of the end walls in an obvious manner. Prefer.:

ably integral with the wall l, a supponga@ pas@ fr is provided and said wall is also provided with an intake opening or port 5 and an outlet or dis-1 charge port 6 which are preferably diametrically opposite. The intake port communicates with the bore ofthe housing, and webs 7 are formed in the 6@ housing across the inlet passage to prevent the entry of any large foreign object which might prove destructive to the interior mechanism or the pump. Said webs form a smooth continua= tion of the interior surface of the housing so that the impeller blades may pass the port smoothly. The outlet port communicates with the bore of the housing through a. plurality of slots 8 in the cir cumferential wall, ribs 9 between said slots conforming smoothly to thecurve of the bore of the housing. Exteriorly of said ribs 9 is formed a cavity 10 terminating in an abrupt shoulder 11 ad` jacent the top of the housing.

lAround the intake port, the circumierential wall of the housing is provided with an out- 'Z5 wardly projecting neck l2 to which is bolted a short pipe section 13 having clean-out openings le normally closed by plugs l5. Between the outer end of the neck '12 and the inner end of the pipe 13 a removable screen i6 is clamped, as 8@ shown..

Referring particularly to Figs. l2 and i3, the cross-sectional contour of the bore of the housing will be made known.

The numeral 16 indicates a curve representing 85 a truecircular bore cut about the point l? as its axis. The numeral 18 represents a point on a radial line 19 at a given or desired distance from said axis 17. This distance is represented y as a. The' outer curve 20 represents the finished eo here which is developed as follows:-

A desired number of radial lines 21 are drawn through said axis 17, and a. similar number o lines 22 are drawn through said point 18. each parallel to its next adjacent radial line 21. At e5 the points at which said radial lines 21 intersect the curve i6, tangents 23 are drawn to intersecty its adjacent parallel line 22. The mints 2d, de tered by the intersection of said lines 22 and said tangents A23, are the points by which said ico line 2u is developed, and all lines drawn through the point 18 between any two points 24'. l be equal in length. Comparison of the curves i6 and 2i) will show that they coincide at top and bottom and the bore is slightly oblate in crosslos' section.

The end walls 2 and 3 are each provided with a central projection or nose 25 having kan inner recess I26 to receive anantiffriction bearing 27. Shafts 28 are journaled in the bearings 27 and 11o project outwardly past the end walls to be driven by any convenient motor, stufiing boxes 29 being provided to prevent leakage of lubricant. On the inner end of each shaft 28 is a concentric disk or head 30 which is formed with an outstanding 34 which bears against the outer face of the disk or head 30, and pressed firmly around the periphery of said annular projection 34 is a race sleeve or track 35 preferably made of some extremely hard metal and having its periphery slightly oblate to correspond with the crosssectional outline of the bore of the housing, the distance between the trackand the wall of the bore being the same at all points.

Said shafts 28 are in axial alinement, and their axes of rotation correspond to the point 18 in Fig. 12.

The periphery of each head or disk 30 is provided with an annular rabbet or recess 36 which receives a sealing ring 3'7 which may rotate with the respective head and prevents leakage between the head andthe adjacent end wall, a cooperating ring 38 being seated in the circumferential wall so that the joint between the walls is efv fectually covered. A slight clearance is provided between the peripheries of the heads 30 and the rings 38 to avoid frictional resistance. The rotor includes approximately quadrantal sections 39 bolted iiatly and rigidly to rthe inner faces of the heads 30 and engaged around the inner disks 32. One edge of each section 39 is provided with corrugations 40, and in the other edge is formed a rectangular transverse groove 41. Said sections, when attached to the heads 30, rigidly hold the heads together and form between their opposed sides radial guide grooves which intersect at a central point and in which the impeller blades are fitted and operate. l

Each impeller has two fiat substantially rectangular end portions 42 which are of a length slightly less than the distance between the inner faces of the heads'30, and are integrally connected by aiiat bar or shank 43 which is con-' siderably narrower than the length of the end portions 42vand is offset from the medial longitudinal line of the impeller. The length of the shank 43 with the combined widths of the ends 42 make the over-all length of theJ impeller slightly less than the length of one of said lines 22 in Fig. 12. In other words, when the impeller is in 'an operative position, it will extend directly across the axis corresponding to the point 18, but its length will be insuiiicient to permit both its endsl to simultaneously contact the wall of the bore of the housing. It is preferable that the clearance between the ends of the impellers and, the wall of said bore shall be approximately one' sixty-fourth of an inch. Each end of the impeller is provided with a transverse groove or recess 44 and with perforations 45, anda transverse sealing plate 46 is seated in each recess and is held in slidable engagement with the impeller by bolts 47 insertedthrough said perforations and slots 48 in the sealing plate, so that the plates are permitteda slight transverse movement and when will cause .the impellers to `move. in the direction theyare at the outer end of their throw their outer edges simultaneously contact with the wail of the housing.

Extending from the opposite edges of each of the' end portions 42 are spindles 49, the distance between the opposite ends of each p airof spindies being substantially equal to the distance be-k tween the inner faces of the end-wal1s2 and 3 at f the point adjacent the tracks 35. Each of said, spindles 49 is providedwith an annular shoe50 preferably made of some extremely hard metal, and keyed to the spindle. It may be found desirable, however, to substitute rollers for the shoes 50, and to eliminate the keys.

When' the impellers are disposed in :the guide grooves between the rotor sections,- they will be positioned inversely with relation to each other, so that the shank, 43 of one impeller will extend transversely across theshank of the other impeller. The spindles 49 pass through the slots 33 in the heads 30 of the rotor, and the shoes 50 slidably rest on the tracks 35 so that, upon rotation of the shafts 28, and the consequent rotation ofthe rotor and said heads 30, said tracks of their own lengthl so as to always bring said plates 46 into contact with the wall of the bore of the housing. It may be understood that, if desired, the plates 46 may be eliminated and the impeller blades constructed to a length causing both ends of each to simultaneously contact the wall of the bore. It may also be seen that the tracks 35 may be omitted when sufciently small pumps are being built. This could be done because of the fact that in small pumps the friction between the wall of the bore and the ends of the impellers will not be so great as to require said tracks.

In order to lessen the friction between the sides of the impellers and the adjacent faces of the sections of the rotor, rollers 51` may be iitted in the grooves 41 of said sections. The corrugated portions 40 of the rotor sections constitute means for permitting the free escape of any liquid which may enter between said sections and the impellers, and prevent the pressure of such liquid from tending to retard the longitudinal movement of the impellers. They also act as a means for retarding movement of any such liquid longitudinally of said impellers.

A plurality of lubricating valves 52 are fitted in the end walls for supplying a lubricant to the bearings 27 and to the tracks 35..

In the sides of the circumferential wall 1, there are arcuate grooves or recesses 53 which open 130 into the bore of the housing, and in the top of said wall is fitted a suspending ring 54 to facilitate handling of the cylinder while boring and finishing the same.

The device is assembled substantially as follows:-

'I'he impellers will be assembled complete as illustrated in Figs. 8 and 9; the rotor sections will be bolted rigidly to the face of one head 30; one impeller will be inserted in the slot between the rotor sections with its spindles extending out-i wardly from said head; the other impeller will then be placed across the iirst impeller in the horaria viously received a track 35 will then be ,placed over said shaft and pressed into engagement with the adjacent end of the circumferential wall and the securing bolts will be tightened down. The packing glandwill then be placed around the shaft and bolted in place. At this point it may be noted that one end of the device is connu pletely assembled.

The other end is assembled substantially as follows:-

The rollers 5i will be inserted into the grooves,

inner wall of the rotor chamber, the housing 'being cut away at said outlet to form a cavity Zli; one ci the sealing rings will be placed in the annular groove 36 in the edge of the yet free head 30; said-head with its shaft will be placed against the open end ofthe circumferential wall and will be rigidly bolted to the rotor sections, with the spindles or the impellers extending cutel wardly through the slots 33 in the head; the shoes 50 will be keyed to the protruding ends of saidspindles; the bearing will be placed over said shaft 28 and pressed against the presented hub 3l; the end wall which has previously received its track 35 will then be placed over the shaft, and will be rigidly bolted to the adjacent end of the circumferential wall; and, nally, the packing and gland will be placed over the shaft and drawn tightly into place.

En operation, power will be furnished to rotate the shafts in the proper direction, indicated by the arrow in Fig. 3. Tile conveyed fluid will enter through inlet 5, and will be exhausted through outlet d by the action of the impellers and by the action of the plates ld upon the wall of the bore. lt ma] be seen that it will be impossible for the iinpellers to carry any or the fluid past the upper -radial center of the bore because, when they reach the shoulder li, their ends will be exactly :Hush with the periphery of the rotor, and there will be no room between the wall a and the pe riphery of the rotor for the uid to pass. The impellers will exert a squeezing pressure on the fluid as they approach the upper center of the cylinder, and this pressure will force the duid into 'the cavities lo and against said shoulder il, and aiter'said cavitiesare once lled with the fluid, the fluid therein will remain practically dormant due to the pressure to which it is being subjected. This condition then will cause all iiuid whichi subsequently enters to dow outv through outlet e without entering the upper portions of said cavities.

lt may be seen that when the device is in operation, the rotor and impellers, and all other revolving parts of the device are at all timesin a static balance, and that consequently the de:s vice will operate with very little vibration. lt may further be seen that, due to the fact that each impeller is one solid unit and contacts dif-1 ferent sides of the bore with its ends, the' device is rnuch niore positive in action than any rotary purnp now' in use. The centrifugal force ol the rotating irnpellers will cause said plates 46 to remain at the outer ends of their throw and in positive engagement with the walls of the bore.

Any iiuid whichlmay pass up between the pron jecting sides of the rotor and the sides of the circumferential wall. at the c`ribbed portion 9 will enter the recesses 53 and thence escape so that it will not tend to travel around with the roller flange and impede the operation.l

The ends of the impellers are at all times in contact with the wall of the rotor chamber and travel smoothly thereover.

l't is to be understood that an emcient power unit could be constructed along the principles involved herein without departing trom the invention or the scope of the claims.

Having thus described my invention, what is claimed and desired to be secured by Letters Patent, is:

l. A rotary pump embodying a housing having a rotor chamber and having an inletand an outlet communicating with said chamber, inner and outer laterally spaced vertical webs extending entirely across the outlet and having their inner ends conforming to and forming a part of the deiining an abrupt vertical shoulder integral with the top or" the housing and adjacent the vertical axis thereof, there being spaced relatively shallow outwardly tapered grooves formed in the exterior faces of the outer Webs and having their large ends communicating with said chamber and their srnall ends spaced from the annular wall of the housing, a rotor having its lairis of rotation oiset to the chamber, a pair or" crossed impellers revoluble with said rotor and mounted thereon or movement longitudinally of themselves, and means for causing said impellers to move longitudinally' for simultaneously engaging both ends of each with 'the Awalls of said chamber at all times during the rotation of said irnpellers.

2. A rotary pump embodying a housing having a closed ended rotor chamber and an inlet and an outlet spaced from each other circumferentially ci the chamber and communicating with substantially opposite sides of said chamber, inner and outer laterally spaced vertical webs extending entirely across the outlet and having their inner ends conforming to and forming a part ci 'the inner wail of `the chamber, the house ing being cut away to forni a cavity at the center ci the top thereof defining an abrupt vertical shoulder integral with the housing and disposed adjacent the vertical airis thereof, tapered segmental grooves in the outer faces of the outer webs and having their large ends communicating with the chamber andtheir small ends spaced troni the housing, said chamber having its upper and lower diametrical points concentric and its intermediate points eccentric to the axis of said chamber, a rotor having its airis of. rotation ofiset toward one of said concentric points, and a pair oi impellers carried by and revoluble with said rotor, said irnpellers being mounted for movement with relation to said rotor in a direc= tion longitudinally of themselves.

3. A rotary pump embodying a housing having an oblate'rotor chamber and having an inlet port and an outlet port communicating with said roc ros

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chamber in spaced relation to each other circumy .ferentially of the annular wall oi the chamber, necks extending outwardly from said housing about said ports, a pipe section secured to the outer end of the inlet neck, the annular wall of the chamber being formed with laterally spaced vertical ribs extending entirely across the inlet and outlet ports and through the necks to the outer ends thereof, the inner ends of said ribs neck whereby to brace the screen against inward thrust, the annular Wall being also cut away to form an internal cavity extending upwardly from the outlet and terminating in an abrupt vertical shoulder integral with the top of the housing adjacent the vertical axis thereof, a rotor in said chamber having 'its axis offset towards one end of. the minor diameter of the chamber, and a pair of Acrossed impellers revoluble with said rotor and i versely spaced circumferentially extending slots dening spaced webs extending entirely across the inlet and outlet and through the necks to the outer ends thereof, said webs having their inner ends arcuate and conforming to and forming a part of the wall of the rotor chamber, a pipe section secured at the outer end of the inlet neck, a screen clamped between said pipe section and the outer end of the inlet neck and bearing against the outer ends of the webs therein, a portion o the annular Wall of the housing between upper ends of the webs of the inlet and outlet ports being unbroken, a rotary shaft extending into said chamber through an end of said hous-` ing, a rotor in said chamber connected with the inner end of said shaft,and impellers slidably carried by said rotor and projecting from the periphery thereof with their ends contacting with the annular wall of the chamber.

LOUIS V. JOHNSON.

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