US2003615A - Rotary pump - Google Patents

Description

June 4, 1935. c. sMnl-l E1'- AL 2.* 003615 ROTARY Puur Filed Aug. 10; 1953 if? s /a P-,2 Za 2/ .s2 f l E95. MM

Patented June 4, 1935 PATENT orrics aorAaY rom Charles Smith, Albert E. Prohaska and Albert L. Wilson, Denver, Colo., assignors of one-fourth to 0. B. Schmidt, Denver, Colo.

Application August 10, 1933, Serial No. 684,521)

4 Claims.v (Cl. 103136) journals Il preferably provided with suitable y This invention relates to a rotary pump. Rotary pumps of the pressure type have not been commercially successful owing to the fact that when operating against heavy pressures or upon fluids containing abrasive substances, the pumps are subjected to rapid wear and deterioration which soon renders them useless or inelcient. The principal object of this invention is to provide a rotary pump construction in which this excessive wear will be eliminated or greatly reduced, and to provide a pump which can operate against high )pressures indefinitely.

in the usual rotary pump, the pump vanes are pressed against the interior of the housing by centrifugal force, and, in some instances, by springs. This excessive pressure increases with the speed that the pump is operating causing a high coeicient of friction and a rapid wearing away of the vanes and walls. Another object of this invention is to provide a construction by means of which the vanes can be prevented from coming in actual contact with the housing walls lso that wear at this point may be entirely eliminated.

Another disadvantage of the usual rotary `pumps resides in the fact that the uid being pumped leaks into the bearing for the pump shaft so as to carry foreign materials thereinv ing drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a vertical cross section through a rotary pump in which the features of this invention have been embodied. lThe section in this view is taken on the line I-I, Fig. 2. d

Fig. 2 is a longitudinal section through the pump of Fig. 1, taken on the line 2 2, Fig. 1.

Fig. `3 is a detail section through-a portion of the pump rotor and vane, taken on the line 3-3, Fig. 1.

The improved pump consists of a cylindrical pump chamber I0. Each face of the pump .chamber I isr closed by means of a circular face plate Il. A shaft l2 passes completely through both face plates il and through the pump chamber I0. Packing glands I3 are provided to prevent leakage about the shaft' I2. The shaft I2 is supported in a pair of out-board ball bearings Il', The journals Il are supported from the face plates II upon suitable strength-,- ening ribs I6 cast or otherwise formed thereon, It will be noted that the shaft I2 passes through the pump chamber l0 eecentrically, preferably, but not necessarily, above the center line of the chamber.

A circular rotor Il is keyed to the shaft I2 within the chamber I 0. This rotor is of a diameter to bring its periphery closely adjacent ki the inner wall of the chamber Il) on the of the greatest eccentricity.

The rotor I'I is provided with a series of lateral, radially extending, slots I8 in each of which a vane I9 is arranged to reciprocate. The vanes I9 have avthickuess substantially equal to the width of the slots I8 and are of a width to substantially fillthe space betweenV the heads II. The friction between the vanes and the rotor is relievedby means of roller v side44 bearings 20 which are positioned at each side of each vane within the rotor I1.

Each vane is longitudinally bifurcated to vform a slide for a sealing block 2I, each of which carries a rotatable sealing bar 22. The

blocks 2| may be moved outwardly or inwardly' to vary the space between the sealing bars 22 and the inner vsurface of the pump hamber `lli by means of a pair of wedge blocks 23. The wedge blocks 23 are mounted in'pairs in each vane upon threaded rods 24. The-threads at vthe opposite extremities of the rods 24 are opposite hand, so that as the rod is rotated, it

A full oating wheel shaft 21 extends longitudinally through each of the vanes I8 and is preferably `journalled therein on roller bearings- 23. A bearing wheel 29 is secured on each extremity of each wheel shaft 21. The bearing wheels 29 travel in a circular indented track groove v3B in each face plate il. The tracks 3|! are concentric with the axis ofthe pump chamber l0 and the width of the track grooves 3b is substantially equal to the diameters of the wheelsl.

The pump chamber l0 is provided with fluid nipples 3l and 32 and preferably with a supporting base 34. The face plate may\be detachably clamped to the pump chamber Il by means of suitable bolts 33. f It is desired to call attention to the fact that either of the nipples 3l and 32 may be employed as the intake, the remaining nipple being the discharge, depending upon the direction of rotation of thelrotor Il.

Operation Let us assume that the rotor I1 is turning clockwise, in 'which event the nipple 32 would be the intake and the nipple 3| the discharge. The wedge blocks 23 are adjusted so that the sealing bars22 will closely approach the inner wall of the chamber |0 at the top and bottom sides of the chamber. It is desired to call attention to the fact,'however, that the`wedge blocks prevent, owing` to their dove-tailed construction,` the, sealing bars 22 from actually touching the walls. They may however be brought to within'1/1000 of an inch of the walls if desired.

^ The fluid being pumped ilows into the chamber |'0 in the rear of each vane. The following vane then, owing to the eccentric position'of the wheel tracks 30, closes oif the uid from the intake andforces it toward the outlet 3| as is usual in rotary pumps. At no time, however, is there frictional contact between the vanes andk the pump wall to cause wearing away of the vanes and wall.

Immediately below each nipple 3| and 32, a chamber wall is inclined outwardly as shown at so as not to restrict the intake or discharge passages. It will be noted that, at the positions 35, the vanes are widely separated from 4the walls, owing to the circular contour of the track grooves 30, and the non-circular contour of the pump chamber wall. This allows a wide `unrestricted' channelfor the inflow and outflow L pump operates practically without sliding frictional contacts. It will benoted that should there be any leakage through the packing 'glands I3, it cannot reach the bearings l5 as it will be thrown from the shaft in the open space between the packing glands and the bearings. v p A smallflange 36 may be formed on the peripheral edges of the faces of the rotor I1.

Each of the anges 36 flts snugly into` a circu'- lar groove 3l in each face plate The flange tends to prevent leakage past the faces of the rotor While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may .be varied, within the scope of the appended claims, without departing from the spirit of the invention. Having thus described the invention, what is claimed and desired secured by Letters Patent is: Y

l. A rotary pump comprising: a cylindrical housing; a. rotor eccentrically mounted within Vsaid housing so that its periphery will closely l approach one wall thereof; vanes slidably mounted in radial slots in said rotor; means for maintaining said vanes in close proximity to, `yet separated from, the wall of said housing during their revolution; a fluid inlet at one side of said rotor; a fluid outlet at the other side thereof;'a sealing blockslidably mounted in a longitudinal slot in the extremity of eachA vane; .means interposed between the vane and the block to project or withdraw the latter, said means comprising: wedge members between said bloclf and said vane; and means for actuating said wedge members.

2. A rotory pump comprising: a cylindrical housing; a rotor eccentrically mounted within said housing so that its periphery will closely approach one wall thereof; vanes slidably mounted in radial slots in said rotor; means for maintaining said vanes'in close proximity to, yet separated from, the wall of said housing during their revolution; a fluid inlet at one side of said rotor; a fluid outlet at the other side thereof; a sealing block'slidably mounted in a longitudinal slot inthe extremity of each vane; and means interposed between the vane and the block to project or withdraw the latter, said means comprising: inclined surfaces on vsaid block provided with dove-tailed grooves,

there being a dove-tailed groove in said vane oppositeV said iirst grooves; and dovetailed wedge blocks co-acting with said grooves to project or withdraw said sealing block as desired.

3. A rotary p'ump comprising: a cylindrical housing; a rotor eccentrically mounted within said housing; vanes slidably mounted in laterally extending radial guideways in said'rotor; each of said vanes having a slot extending longitudinally along its outer end; a sealing block slidably mounted in each slot so as to extend beyond said vane, the bottom of each sealing block having an inclined surface; a wedge block positioned between the bottom of said`slot and said inclined surfaces; means,I for moving said wedge block so as to force said sealing block outwardly or draw it inwardly so as to increase or decrease the length of said vanes as desired; saidl means including dove-tailed connections between said inclined surface and said wedge block and betweenv the bottom of said slot and said wedge block so that the latter may exert a pulling as well as a pushing action.

4. A rotary pump comprising: a cylindrical housing; a rotor eccentrically mounted Within said housing; vanes slidably mounted in laterally extending radial guideways in said rotor; each of said vanes having a slot extending longitudinally along its outer end; a sealing block slidably mounted in each slot so as to extend beyond. said vane, the bottom .of each sealing block having `two opposed inclined surfaces on its bottom; a dove-tailed spline extending along the bottom of said slot; a wedge block in each extremity of said slot in interlocking engagement with said splines; and a threaded rod passing through both said wedge blocks so as to actuate them toward or away from each other.

CHARLES SMITH. ALBERT E. PROHASKA. ALBERT L. WILSON.

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