US1639961A - Self-metering rotary pump - Google Patents

Description

Aug- 23 1927' P, c. PETERSEN SELF METERING ROTARY PUMP Filed Aug, 2l. 1926 v 2o. Czfetersen,

Patented 23, 712927. I. l 'UNITED STATES l l-csasunv lPrvrlazla'r orFlcE.

ETEB PETEBSENfOF CEDAR FALLS, IOWA,` ASSIGNOB T VIKING ZPUMI'? COMPANY, 0F CEDAR FALLS, IOWA.

sam-mrunme :tornar PUMP.

Application led `August 21, 1926. Serial No. 130,665.

My invention relates to improvements in self metering rotary pumps, and the obJect of my improvement is to provide a pump of this type capable of delivering liqulds at denite volumes per unit of time accordingto the relative speed of rotation of its interacting operating elements, the method of construction of the same, and the means for control of the re lating pressures,

This object I ave accomplished b the means which are hereinafter describe and claimed and which are illustrated in the annexed drawings, it being understood that changes in the recise embodiment or 1nvention herein disclosed can be madeV within the scope of what is claimed without departing from the spirit of the invention.

In said drawings, Fig. 1 is a front elevation of my device, with parts in section or broken away, the front cylinder head being removed except parts shown in section as in operative positions within the pump cyl-v nder. Fig. 2 is an elevation of the mner face of said cylinder head. Fig. 3 is a vlew of my device partially in central, vertlcal, longitudinal section and partially in side elevation, with parts broken away.

The pump cylinder 1 of my device has av c linclrical bore closed at the rear, open at the front, the open front end being closed by a removable cylinder head 27 secured by means of machine screws 28 passed through holes 32 in the margin of the head and threaded into sockets 29 in the cylinder end. As shown in Fig. 2, said cylinder head has a cylindrical boss 30 which lits into the forward part of the cylinder bore 2, and this boss has an eccentric stud 33 projectin into said bore, also a crescental boss 31'wit arcuate convex inner face which latter is concentric with the stud 33, the said boss 31 and stud 33 having uses to be hereinafter described.

A cylindrical rotor 24 is rotatably fitted in the bore 2 with its rear fiat face abuttedl upon and in contact with the rear flat wall or back of said cylinder bore, and has a cylindrical shaft 20 mounted in a cylindrical bored bearin 8y of a prolonged body part 6 of said c mder 1. The rear part of the body part 6 as the shaft bore 8 enlargedl at 9 around said shaft 20 to seat packing 23, the latter retained by means of a cylindrical plug or gland 22 having on its outer end a pair of diametrically opposite ears which engage the end of the body part 6 and are seated vin recesses of a plate 21 secured by screws whose positions are indicated by dotted lines. A belt wheel (not shown) or other driving means may be mounted on the outer rear end of the shaft 2O to rotate it at any desired Speed, in the direction indicated by thearrow in Fig. 1.

The numeral 13 denotes a reservoir for liquids, such as oil, and for the purpose of convenience in illustration is shown at orv a little above the level of the cylinder 1, but it is to be understood that in practiceit is permissible to position the reservoir in any desired relation to the pump in accordance -with existing conditions.

Thecylinder 1 has ,an inlet port 11 traversing a lateral bom 4 and in communication with a pipe 12, which may be lon er than shown, and incommunication with. iquid in saidreservoir. The cylinder 1 has avertically disposed boss 5 apertured to communicate with a discharge or outlet port back into the reservoir 13 including a valve chamber 16 with interior valve to control the passage of liquid therethrough from the pump. A branch conduit at 18 leads from the conduit 15 into a pressure age 19 to permit indication of the liqui pressure. Referring to Fig. 2, the cylindricalboss 30 has a, pair of edge recesses 35 and 36 which afford clearance respectively in the cylinder to the ports 14 and 11 to permit of lunrestricted liquid flow. l

The cylinder body has a vertically disposed boss at 7 in the rear of said boss 5. The boss 7 has an interiorly threaded aperture 34 to receive the threaded end of a pipe 17 which may lead to any desired places of deposit, such as bearings of mechanisms or g5 motors to supply liquid lubricants thereto in metered quantities, or into containers for v receiving the metered liquids. The body lpart 6 has a longitudinal passa e 10 of a determined cross-sectional area o relatively small size which leads from the cylinder bore 2 into the aperture 34 and pipe 17.

The rotor body has one or more passages 26 therethrough and positioned at such a radial .y distance from the axis of the rotor as to pass across the adjacent end of the passage 10 once during each rotation of the rotor. By providing any desired number of like and like positioned passages 26 in the rotor body in one rotation ofthe rotor the un metered quantities discharged may be multiplied to thus vary the discharge of the pump through the pipe 17 in a given unit of time.

The rotor has forwardly projecting crown teeth 2. An idler pinion 37 is loosely rotatably mounted on the stud 33 and -is in interior mesh with said crown teeth 25, whereby the idler is rotated in the same direction as the rotor, as shown by the arrow on the idler.

It will be seen, that when the rotor and idler are in rotation, their teeth interact in such a way as to pump liquid from the reservoir 13 positively by Way of the conduit 12 vand port 11 in portions and which latter.

are-carried into the tooth spaces of the rotor and idler past the inner and outer faces of the boss 81 to be discharged into the outlet port 14 and thence by way of the valvecontrolled conduit 15 to the reservoir. As the forward end of each rotor passage 26 is at such a radial distance from the axis of the rotor as to be alined with a part of the interspace of roots of teeth on the idler 37 and the ends of the meshing crown teeth 25, the passages 26 will receive at each rotation in each case like portions of liquid in said bore 2 as may be forced into these passages in turn by the space contracting actions of the meshing teeth of the rotor and idler. At each rotation ot' the rotor, therefore, a certain quantity of the liquid is forced through the communicating passages 26 and 10 and the discharge pipe 17, and as the rotor may be rotated at any desired speed, from 50 to 1800 or more rotations per minute, a stream of liquid is discharged by the pipe 17 of a known volume per minute in direct relation t0 the number of revolutions 'per minute. The pressure of the liquid in the conduit 15 may be varied by proper turning of the valve therein, the back pressure being varied to similarly aii'ect the uantity by way of the passages 26-10 and (the pipe 17. The regulation of the delivery through the pipe 17 is thus llexibly varied and as certainly as required for any purpose, the main circulation by Way of the conduit 12 to the pump and the conduit 15, bein idle.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a device of the character described, a reservoir, a rotary pump cylinder in communication with said reservoir and having a discharge passage of a predetermined areal cross section, and intermeshing rotary piston devices mounted within said cylinder, one having one or more discharge passages, each of the samecross sectional area as the first-mentioned discharge passage, said devices being shaped and operative to pump liquid from the cylinder 1nto and throu h said first-mentioned discharge passage to liver it metered therefrom at a quantity discharge depending upon the relative number of rotations of said piston devices, the degree of liquid pressure caused to exist within the pump cylinder, and the number and size of any such 'liquid discharge passages 70 which may be in said devices, said last-mentioned passages being located to periodicallycommunicate with the first-mentioned discharge' passage.

2. In a device of the character describelr 15 a reservoir, a rotary ump cylinder in conn-7 munication with saidp reservoir, and Ahaving a discharge conduit, a pressure ga e in communication with said conduit, sai cylinder having its said discharge conduit of a predetermined cross-sectional area, intermeshing` piston devices rotatably mounted within the cylinder operative to pum a liquid fromf'! said reservoir thereinto, an one of the pis-ff' ton devices having one or more a ertures offiz 85 like cross-sectional areas and vo urnes, said?" cross-sectional area bein in size and shape` the same as those of sai discharge conduit to register therewith in passing it.

3. A device of the character described, coinprising a rotary pump cylinder in communication with a supply of liquid and havin a discharge conduit of a predetermine cross-sectional area, and intermeshed devices rotatably mounted in said cylinder, one device being mounted idly, the other having an aperture of determined cross-sectional area, shape and volume, and positively rotated whereby the aperture comes in registration wi-th and in communication with said discharge conduit during each rotation of said apertured device, to thereby meter the liquidl discharged through the discharge conduit as delivered by sald aperture of determined volume during the rotation in a given timeof said apertured device.

4. A self-metering rotary pump, comprising in combination, a li uid reservoir, a hollow closed pump cylin er having an inlet port in communication with said reservoir, a rotor in said cylinder having crown-teeth and one or more apertures each of like predetermined cross-sectional area and volume, and located definitely with regard to the nearest ad'acent crown-teeth, arear Wal'l of said cylin er abutting the rotor having a discharge passage therethrough of the same cross-Sectional area as that of each of said apertures and positioned to register therewith during each rotation of the rotor, an arcuate bosson the opposite cylinder head positioned within the crown-teeth with its outer wall contacting with certain of the crown-teeth.- a cylindrical stud projecting inwardly eccentrically from said cylinder head, an idler pinion loosely rotatably mounted on said stud and in mesh interiorly with said ycrownteeth, the inner arcuate face of said boss contacting with certain of the idler teeth, and the aperture or apertures of said rotor being located for communication with the gree of liquid pressure caused to exist witli- 10 cylinder through an interspace of the teeth in the cylinder, and to the number, volumes ofthe rotor and idler, when meshed, only at and cross-sectional areas of the liquid pasa time when the aperture is also in communisages contained in the rotor that periodically cation with said cylinder discharge passage register with the first-mentioned cylinder at each rotation of the rotor, whereby the discharge passage. 15 quantity of liquid discharged throu h said In testimony whereof I affix my signature.

discharge passage is metered accor ing to y the speed of rotation of the rotor, to the de- PETER CHRIS PETERSEN.

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