US2605715A - Rotary pump piston - Google Patents

Description

Aug. 5,1952 D. 01' BRANT ROTARY PUMP PISTON 2 Si-lEETS-SI-lEET 1 Filed Feb. 8, 1949 INVENTOR.

5, 1952 D. o. BRANT ROTARY PUMP PISTON 2' SI-iEETS-Sl-IEET 2 Filed Feb. 8, 1949 INVENTOR.

W fizz-media? Patented Aug. 5, 1952 2,605,715 W I t I ROTARY PUMB PISTON David OQBrant,BeverlyIiilla Calir. I Application February 8, 1949, Serial No. 75,257

1 This invention relates to a rotatable pump piston.

In my copending application for patent on; a

pump, filed January'26, 1946, Serial No. 643,613, which matured into'Patent No. 2,468,734, issued 5 Claims (01. ing-1 May 3, 1949, I have described and claimed a pump structure of the rotary piston type comprising a two part housing one part of which is rotationally adjustable in relation to the other part in such a manner that, the outlet for the stream delivered from the pump may be reduced in size to any desired extent, even to the complete closing thereof. In said application is also described an improved rotatable piston contained in the aforesaid housing. The present application is a division of the above mentioned application and the claims hereinafter presented are confined to portions of the pump structure other than to the two part adjustable housing claimed in said copending application.

Pumps of this type now on the market are for the most part unnecessarily complicated and unnecessarily expensive to build and operate because of the metal-to-metal parts needing to be perfectly fitted to each other in order to create the required vacuum within them. Also. hitherto, their metal-to-metal engaging parts generate so 'much friction that they. wear out more rapidly than they should, or else to reduce the friction of the rubbing part it is necessary to gear them down an undesirable amount from the speed produced by the motor, and to vary the discharge it is consequently necessary to change'the gear ratio for each change of speed, or else to employ a complicated and costly varispeed drive.

Accordingly it is an object of the invention defined by the present application to provide an improved structure for the rotorper se wherein rubber or rubber-like parts may be utilized in a more advantageous way to construct the vanes or therotor, a rotor with vanes of this kind giving a smooth operation and delivering an uninterrupted stream with a minimum of agitation of the liquid, accompanied by an absence of foaming andchurning which if present might be harmful to the milk or other edible product being delivered.

A more specific object of the present invention is to provide an improved rotary pump piston wherein metal is combined with rubber or rubber-like material in such a manner that the metal weights the free end portions of the vanes of the rotor so that centrifugal force is utilized in a-more eflicient manner to maintain said vanes in properpumping contact withithe. innerperiphery or the pump casing.

It is also an'object of the present::invention to provide, as a new article of manufacture, a

rotor vane "having an elastic body portion. and

an: outer end portion weighted in a nerto aid centrifugal force.

With the foregoing and other objectsin view the invention consists of certain novel parts hereinafter described and claimed, it being under! stood that modifications within the scopeof the claims may be made without departing'fromthe spirit of the invention. Referring to the accompanyingdrawings, which illustrate what is at present deemed'to been. pre' ferred embodiment of the invention: a Fig. 1 is a plan view'of'the'device shown attached to an electric motor wherefrom it is driven. Fig.2 is a section taken on irregular line 2:-'-2- ofFig.3. 1 Fig. 3 is a section taken on irregular of Fig.2.

Fig. 4 is a section taken on angular ofFig.2. T Fig. 5 is a view partly in'section and partly'in side elevation looking in the direction of the arrows 5-5 of Fig. 6.

Fig.'6fis a section taken on line 66 ofFig. 5. Fig. 7 is an internal face view of the rotationally adjustable means for coupling the pump housing to the'motor. Fig. 8 is a vertical section on the plane indi= cated by line 8-8 of Fig. 2.

Fig. 9 is a perspective view of one of the rotor shown in Fig. 6. Ii

Referring in detail to the drawings, the main parts of the structure shown are the'pump casing it), motor housing II, intermediate mounting member [2, coupling sleeve or bushing 3, rotor I4 provided with peripheral vanes l5, and'the clamping means 16 whereby the pump casinglfl is fixedly secured in various rotational adjust ments in relation to'the motor housing ll.

Describing now therotor l4 together with its vane structure, said rotor comprises a body-portion I1 the general outline of which approximates a square, each corner portion ofsaidbody being furnished with an extension 'l8,"each of said extensions having'a tangentially directed, approximate semi-circular projection I 9 to which is rockably attached one of the already men tioned rotor vanes Hi. The rotor body "in cluding its parts I8 and I9 is of the nature of a thick flat plate and the .vanes'l5 are-of sub lin 3 line 44 of the vanes stantially the same thickness as said plate, each of said vanes, as seen in side elevation being of an ovoidal shape except that it has a definite point 28 at the more tapered end of the ovoid. There is cut into that end of each vane [5 which is opposite to its point an arcuate recess 2!, the arc of this recess extending through somewhat more than 180 degrees, this recessed portion of the vane being rockably fitted over the aforesaid rotor extension l9 so that the vane may rock to a limited extent. In operation the rocking movement of the vane toward the center of the rotor is limited by an adjacent curved wall 22 of the rotor body, and its outwardrqcking movement is limited by the vane contacting with the inner face of the peripheral wallof the rotor casing.

It will be seen that the somewhat square ap- V pearance of the rotor I4 is due to the fact thatits otherwise circular periphery is interrupted by circumferentiall'y. spaced. apart recesses within which are swingably mountedqthe-vanes. |5, .said recessesbeing' defined principally by their curved inner'sidesr22 (seeFigrB).

'ASz'Wfil'liShOWllllT FigLG a spider-like reinforcing member '23 is provided for the rotor, said member consisting of. ancentral' hub portion 24 whichis-securable' to the outer end of the motor shafit :25 and which is furnished with four radially'directed arms 26,-each of said arms having arcuate: tangentiallydirected end portion 21 which; terminates in: a' slight globular enlargement 28 located centrally of the circular rotor extension I9. The reason for providing this spidereli'ke reinforcement is that therotor body is preferably made-oi a non-metallic material and therefore. needs: reinforcement.

' Each of. the four vanes; shown is of the same size and pattern and therefore a description of one will. suffice for all. Each vane is shownmade of rubber or rubber-like material which, however, issufii'cientl'y dense, and form-retaining so that the attached vane may be depended upon to remain its operative position and perform its pumping function ei-Ticiently. In order that each vane may respond more dependably to being swung out under the urge of' centrifugal force, there is embedded in the point portion of each vane a. metallicweight 38-. These weights are triangularly shaped to conform to the point portion: or the vanes and are sufiicien'tly less in thickness than said point portion to be safely walled in by the elasticmateriaLthere being a relatively thin wall 3|. between each embedded weight and the outer side: of'the vane carrying it.

The pump housing idcomprises; a front rotor enclosing casing 39 and,v proceeding from the rotor l4 toward the motor sideof the: pump, a back part or closure 4.0, butth'e structurebetween saidclosure. 40; and the motorhousing II will not be described detail in the present application, for'itformsno part of the invention hereinafter claimed. It will suflice' to say here that said closure- 4!) is: rotationally adjustable about an axis which is concentric to the axis'of the motor-"shaft 25, but is provided with; a, circular peripheral shoulder somewhat eccentric to the axis. of, said motor shaft, andhence; because of saidizshoul'der 42,. fitting within the. adjacent side portion of the aforesaid'rotor enclosing casing 33, rotational adjustment of said closure member 40:, the outlet for the stream delivered through the discharge port 41 may be reduced in size to any desired extent, even to the comnlete'closing thereofyand also. the direction of the flow of the liquid may be reversed. However, in all such adjustments the rotor l4 occupies the full internal diameter of the casing member 39, as shown in Figs. 2 and 3, and there is provided around said rotor a continuous, uninterrupted peripheral wall 49 against which the various vanes 15 contact under the urge of centrifugal force.

Th rotor I4 is rotatably ,mounted upon the motor drive shaft 25 by screwing; a reduced threaded extremity 5| of an exposed portion of a hub 24a as seen in Fig. 5 into the threaded bore of a coupling 52, a fragmentary portion only of which is shown in Fig. 5 By referring to Fig. 2 it will be seen that the coupling 52 has its threadedborealso screwed onto the reduced threaded extremity of the drive shaft 25.

In operation the back wall 49 of the pump is set so that the contact point of the rotor and pump housing is at the end of the discharge port 47. This setting causes the vanes I5 to; push air and/or fluid out through said port and. create-avacuum on the farside or intake side of the damformed. at'th'e contact point. As airis driven from the-intake sideliquimL-flows inzand is pushed toward the discharge port by the vanes, thus priming the pump. 7

If a smaller discharge is desired and no further priming is required the back wall 49 of the pump may be rotationally adjusted to bring the contact point over the discharge port, thus reducing the size of the discharge passage. Also said back Wall may be so adjusted as to reverse the flow through the motor, as explained in my aforementioned copending application..-.

The flexibility of th vanes permit them ,to conform better to the ever changing contour.- of the housing and to prevent marring of the metal when grit particles get into the pump. Water and other liquids make the rubber parts slippery so that they are water lubricated just the same as rubber bearings on the propeller shafts of ships are lubricated and take care ofsand particles. 7

It will. be seen, by inspecting Fig, 6, that each vane I5 has a projecting end portion [51: which is sem-i -circular that cooperates-with a slight concave recess tip in the peripheral portion of the rotor to limit in a stable manner the outward swing of the vane.

Iclaim: l

l. A rotary pump comprising a housing having a cylindrical interior, a rotorof non-metallic material located in and eccentric to the cylindrical interior of said housing, said rotor comprising a body portion the general outline of which approximates a polygon, a drivingshaft to which said body portion is centrally secured. each' corner portion of said body portion being furnished with an. extension hammer semi circular projection directed tangentially in relation to the rotor consideredas a whole, a plurality of peripheral vanes carried b'ysaid rotor individually having an oscillatory bearing upon said semi-circular projections and movable in a limited are about an-axis adjacent .each

aforesaid corner portion of the polygon, and a spider like. reinforcing. member locatedwithin said rotor, said member consisting of a central nating in a globular enlargement, located centrally of each said rotor projection.

2. The subject matter of claim 1 and said vanes individually having arcuately recessed attached end portions having swingable workingfits upon said semi-circular rotor projections.

3. As an article of manufacture, in a structure of the kind described having a rotor chamber, a rotor body in said chamber and a rotor vane for said rotor body, said vane consisting of a non-metallic elastic body which, as seen in side elevation is of an ovate shape,said vane having a constant width such as to span the width of said chamber with a working fit in planes perpendicular to the axis of the rotor body, one end portion of said vane being contoured in its larger end portion for pivotal connection with said rotor body, said vane being tapered from its said larger end to a point 10-. I

consisting of a non-metallic elastic material which as seen in side elevation is of an ovate shape, the larger end portion of said ovate vane having in it a semi-circular recess, said vane being of constant width, the smaller end portion of said ovate vane being tapered to a rounded point and the tapers forming said point extending from the larger end of the vane, and a metallic weight embedded in said tapered part of the vane.

DAVID O. BRANT.

REFERENCES CITED 'The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 236,732 Sutton Jan. 18, 1881 501,864 Boening et a1. July 18, 1893 1,043,936 Hope Nov. 12, 1912 2,157,141 Murray May 9, 1939 2,468,734 Brant May 3, 1949 FOREIGN PATENTS Number Country Date 1,395 Great Britain June 19, 1855 2,024 Great Britain Jan. 30, 1893

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