US 1444269 A
Description (OCR text may contain errors)
VV. 1. PlATT.
Feb. 6, 1923.
FILED NOV. l, 1920.
, h/w. TEF JZ lifetented Feb., d, 31.@23,
WALTER r. MATT, or oenrnisn, 'camronma ROTARY PUMP.
appupation mea november i, ma. serial' no. 420,967.
To all lw/'tom 15mg cof/wem:
Be it known that l, WALTER J. PIATT, a citizen of the UnitedY States, and resident of the city of Oakland, county of Alameda, State of California, have invented certain new and useful improvements in Rotary Pumps, of which the following is a speelfication. f My invention relates to improvements in pumps, and more particularly to pumpsof that character wherein a rotor, equipped With a plurality of vradially movable blades, is mounted eccentrically within a cylindrical casing and means is provided for actuating the blades to maintain pockets into which water is drawn and discharged as the rotor revolves.
. 4The" principal object of the invention 1s to improve upon pumps of this or similar types by the provision of means whereby the pump willY automatically clean itself of sand and gravel carried in with the water, whereby friction and wear on the moving parts 1s reduced to a minimum, and which makes possible the construction of a durable, efficient and economical pump ata relatively small cost.
ln accomplishing these and other objects of vthe invention l have lprovided the improved details yof constructlon, the preferred forms of which are illustrated in the accompanying drawings, wherein- Figure 1 is a sectional view, taken transversely of the rotor shaft, through a pump constructed in accordancewith the present invention.
Figure 2 isa half section of the same, taken longitudinally of the rotor shaft.
Figure 3 is a perspective view of a rotor, a balancing ring and a sand ring or bushin gthe parts'being shownin disassembled re ation.
- Figure l is aface view of an alternative type of balancing ring havlng an open base portion. l v l Fi re 5 is a transverse section taken on the l1ne 5--5 in Figure d.
'According y, l have provided t native type of balancing ring provided with stops for each ofthe rotor blades.
Referring more in detail to the several views of the drawings, wherein like reference numerals designate the same or like partse y i l designates a cylindrical pump casing, which is closed at its opposite ends by end plates, as shown at 2; the latter being secured to the casing by means of bolts 3 extended through the periphery of the platesand through flanges 4 formed on the casing ends, in such manner as to form a watertight joint.
Extending revolubly through the casing is a rotor drive shaft 5. rllhis is'supported ec- Icentrically above the axial line of the casing within suitably packed bearings, as at 6, in the end plates 2, and has a rotor 7 keyed thereon which is of such diameter that at one side, at the point 8 in Figurel, it will revolve closely yadjacent or in engagement with the casing wall. ln the present construction, the space between the rotor and the casing, following in the direction of rotation of the rotor, gradually increases from the top of the casin to the bottom side thereof, andthen gra vually decreases. This condition provides that water taken in at one side of the casing and driven forwardly by 'the rotorblades, as'presently described, will be ueezed out at the opposite side. e casing, at one side, with' an inlet opening 9 and atthe opposite side with an outlet channel l0 which extends in open communication with the interior of the casing from near the bot tom thereof to adjacent the point of contact of the rotor and casing at the top, where it opens into a discharge spout l1. Suitable connections may be made with the inlet and the outlet openings to lead the water respectively from a source of supply to the pum and then Ato the point of discharge.
W ile l have not shown means for actuating the rotor shaft, it is ap arent that this may be done in any desir-ab e manner, preferably by means of a belt operated over a belt wheel mounted on the rotor shaft exteriorly of the casing.
` rfhe rotor 7 is provided at equally spaced intervals circumferentially with radially directed slots 12, and fitting slidably therein are blades 13, of the same length as the rotor and provided at their inner corners at their ends with projecting lugs 14 that extend within circularly formed grooves 15 concentrically located within balancing rings 16 that are revolublycontained 'within guide grooves 17 formed concentrically within the inner faces of the end walls 2.
The balancing rings 16 are mounted to revolve within bushing rings 18 that are fitted within the grooves 17, so that continuous friction caused by the rotation of the rings 16 will not cause wear on-the end plates but will be taken by these bushing rings which can be more conveniently replaced.
In order that the bushing rings employed may clean fthemselves of sand that may be washed intothe pump with the water, I have provided the base portions 18 ofthese bushing rings with inwardly facing channels 20 and have provided the base portions 16 of the rings 16 with apertures 21 which are adapted to follow in registration with the channels so that a circulation of water between the bushing rings and balancing rings is provided and which will wash out such sand and gravel thatmay collect therein and provide a film of water between these parts that will make operation easy.
The disposition of the rings 16 within the casing ends is such that as the rotor revolves, the blades will be actuated radially within the slots 12 in such manner that their outer edges will at all times just nicely clear the casing walls, leaving onl enough space for a water film that will su stantially prevent leakage.
To prevent excessive wearo'n the actuating lugs 14 of the blades, such as would result if they should have constant rubbing contact with the balancing rings, I have provided these rings at one side with two closely spaced apart stops 25 and 25 as shown in Figure 3, between which the end lug 14 of one of the blades may be extended so that, as the rotor revolves, the balancing rings will likewise be revolved and no relative movement of the rings and blades will take place, but the blades .will be actuated .radially, within the rotor slots, to maintain their position adjacent the casing wall. This construction provides for the distribution of wear and pressure over a maximum area and places it on the ring parts that can be readily and chea ly replaced.
In Figures 4 an 5 I have4 illustrated a balancing ring of an alternative type of construction, wherein the base portion is mostly cut away leaving. large openings 28 to provide for a free and easy flow of water within the sand groove of a bushing wherein the ring may be mounted. In rings of this type bushing ring provided is not equipped with the sand channel. The feature of this ring is that it has a raised annular base portion 29 `forming an annular channel 30 which provides for the flow of water beneath the same in the same manner as is provided for inv the previously described construction. Another feature of this ring is that it may be `die stamped and is of cheaper construction than the rings shownA in Figure 3, but not as desirable otherwise.
Figure 7 illustrates a'ring of asimilar construction to that of Figure, which is not equipped with the raised base portion, but which is die stamped and has base apertures and stops provided as in the prevlous types.
Assuming that the different parts of the pump are so constructed, and are assembled as described, in operation the rotor is driven in the direction indicated by the arrow thereon in Figure 1, and as. the rotor blades move downwardly across the inlet opening 9, water will be drawn in by the vacuum pressure created within the expanding pockets between blades and will be carried by the blades forwardly to be discharged into the outlet channel 10 and forced from the pump as the volume of the pockets is decreased.
Since the rings 16 rotate with the rotor but eccentrically thereof, the blades are moved into 'and from the rotor slots to maintain their relation with the casing and to prevent any backtlow of water. By providing that the rings 16 turn with the rotor, wear on the lugs 14 of the blades is reduced to a minimum and the pressure exertedfto actuate the same vis distributed over the entire wall surfaces of the ring members, reducing wear at any one point to a minimum, and placing what wear there is on parts that can be replaced without muc-h trouble or expense.
Having thus described my invent-ion, what I claim as new therein and desire to secure by Letters Patent, is:
In a. pump of the character described, a cylindrical casing having inlet and outlet ports therein, plates enclosing the ends of said .casing and having annular grooves therein concentric with the casing, bushing rings iittedwithin the said grooves having annular outwardly facing channels in their base portions, balancing rings mounted to revolve in said grooves within said bushings and having annular grooves therein and having openings through the bases of said grooves movable in registration with the channels of said bushings, a shaft?,` mounted members Within said latter grooves engagerevolubly in said end plates to extend eccenable by lugs of said blades to cause rotation trically through the casing, a rotor keyed on of the vrings with the rotor. 10 said shaft, a plurality of radial slots formed Signed at Seattle, Washington, this 26th in said rotor, blades slidably mounteduin said day of October, 1920.
slots having lugs at their ends extending into .the grooves of said balancing rings and stop v WALTER J, PllAT'll.