US1695975A - Revolving-cylinder and reciprocating-piston pump - Google Patents

Description

Dec. 18, 1928.

i E. PELICH REVOLVING CYLINDER AND RECIPROCATING PISTON PUMP Filed Oct. 26, 1925 Patented Dec. 18, 1928.

UNITED STATES ED'UABD PELICH, 0] PRAGUE, CZEGHOSLOVAKIA.

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Application filed October 26, 1925, Serial No. 84,942, and in Czechoslovakia October 27, 1924.

The present invention relates to umps for liquld and gaseous materlals of t e rotary-cylinder and reciprocatingiston type.

There are known pumps in w 'ch a number of hollow prismatic bodies slide relatively to each other within the ho]low space of the main pump body, working spaces of varying volume being produced between the sliding bodies by means of'a shaft havm an eccentric journal. This shaft is forme with inlet and outlet passages which o en into suction and discharge grooves prov1 ed in the eccentric 'ournal. The two grooves communicate wit the working spaces of the pump by passages provided in the body or casing in which the shaft rotates.

According to another known arrangement istons of circular section are carried by a ollow .frame which slides in two slideways of a rotating disc. The pistons move m a central body rotatable 'upon an eccentrically mounted journal so that the several working spaces communicate with suction and discharge passages' arranged in the 'ournal which also communicates with'the i et and outlet passages of the pump.

The object of the present invention is to provide a construction which afiords certain advantages owing to the fact that the eccentric journal is arranged stationary but is adjustably mounted in thecasing so that by turning said journal the capacity or rate.

of discharge of the pump may. be varied. The distributing valve is,arranlged upon the eriphery of a rotating disc w ich revolves 1n the distributor'casing, which enables the sections of the suction and discharge passages'tobe made comparatively. large and moreover simplifies the construction and connection of said passages. This advantage of the external arran ement of the distributing valve is particu a'rly important in the of very small pumps.

ca fine construction embodying the features of the invention is shown in the accompanyin drawings in which: 7 v

ig. 1 is partly a central cross section and partly an end view of the pump, a

Fig. 2 is an .axial section showing the eccentric tion. .I

Fig. 3 illustrates the annular distributing device in section and the manner of adjusting the capacity of the pump by altering the position of the eccentric ournal.

journal in its lower or zero posi- 2 operable by means of an external shaft, or

the like. The .disc 1 is provided with a central prismatic hollow'space 3. In this hollow space is adapted to slide a quadrangular frame 4. A prismatic body 5 is ada ted to slide in the frame 4. A prismatic b y 5 which may act as a pump plunger is rotatably mounted upon a stationary journal 6 which is mounted eccentrically in relation to the axis of the disc 1 in a cover 7 of the casing. The axes of the journal 6 and the disc 1 are parallel to each other, A pointer 8 playing upon a scale 9 arran ed upon the outside of the cover 7 is fixed ly connected to the journal 6.

During the rotation of the disc 1 the two inner members 4 and 5 are constrained to rotate about the journal 6, this rotation producing sliding motion of the member 5 within the member 4 and sliding motion of the member 4 within the disc 1. Thetwo sliding motions are at right angles to one another and correspond to components of a sine line. Owing to the sliding movement of the members 5 and 4 four working spaces a, b, a, d of varying-volumes are produced. These working spaces are connected by passages 11, 12, 13 and 14 with the outer periphery of the disc 1. The passages of the working spaces a, d are constltuted b bores 13, 14 of circular section formed in t e disc 1 and by oval'openings 15, 16 in the frame 4. The passages 11, 12 of the working spaces a, b are constituted by radial bores in t e member 1. The disc 1 is adapted to rotabs in a distributor sleeve 17 which is fixedly mounted in the pump casing 18 and is provided with two oppositely arranged peripheral slots 19, 20 the slot 19 being in communication with the suction union 21 and the slot 20 being in communication with the discharge union 22 of the pump casing 18. The working spaces of the pump therefore communicate alternately with the suction 21 and discharge 22.

The capacity of the pump may be adjusted in two ways:

- According to the first method of adjustment, the journal 6 is turned in a bore of the cover 7 which is arranged concentrically to the axis of the disc 1, as indicated in discharged. If the journal 6 be shi t're of the journal 6. On rotating the disc 1 in the direction of the arrow, 19 will constitute the suction passage of the distributor sleeve 17 whilst 20 will constitute the discharge passage. If the line p0 coincides with the line ij which is the centre line of the distributing sleeve 17, the capacity of the pump is a maximum inasmuch as the total quantity drawn in by the pump is also the position 0', the working spaces of the pump will still be in the suction period although they hitve passed the position a: and have been brought into communication with the discharge passage 20, so that the pump will draw fluid from the discharge end during a portion z, i of its suction stroke. Similarly, the workingspaces will communicate with the suction passage 19 at the end of the pressure stroke after passing the position j, so that the pump will discharge back into the suction passage during a portion j, j of the pressure stroke. If the journal G'be turned through 90 that is into the position 0, the capacity of the pump will be nil, the amount drawn in being equal to the amount discharged back into the suction. On turning. the journalbeyond the position 0, the suction passage w1ll be converted into the discharge passage and the discharge passage will act as the suction passage. The capacity of the quantity discharged by the pump is therefore determined by thev pos,i-'

tion of the journal 6, which may be read on the scale 9 by means of the pointer 8.

According to the second method of ad justment, the distance between the axes of the disc 1 and the journal 6 is varied, the stroke of each piston being equal to the double distance of the axes. I11 the diagram of Fig. 4, 0 indicates the centre of the journal 6 which may be rotated about the axis 1" in the cover 7; by turning the journal 6 the center of the journal 6 is varied between the two extreme positions 0 max. and 0 min. and the effective stroke is correspondingly varied.

passages of the casing; openings in the rotated into able disc in fron of the workin faces of the prismatic isti n sliding in sai disc, and openings in t e said rotatable disc and in the said prismatic piston in front of the second, inner prismatic piston sliding in the first named prismatic piston, said openings connecting the working spaces of both prismatic pistons with the passages of the distributing means.

2. In a revolving piston pump with reciprocating prismatic pistons arranged slidably at right angles to each other in a driven disc rotatably mounted inan outer casing, the inner prismatic piston being rotatably arranged on a journal eccentrically mounted in the casing of the pump, the combination of distributing means on the outside of the rotatable disc, the suction and discharge passages of said distributing means being in communication with the suction and discharge passages of the casin openings in the rotatable disc in front 0 y the working faces of the prismatic iston sliding 'in said disc, and openings in t e said rotatable disc and in the said prismatic piston in front of the second, inner prismatic piston sliding in the first named prismatic piston, said openings connecting the working spaces of both prismatic pistons with the passages of the distributing means, and means for altering 9 relative rotation of said casing and journal, 105.

a second prismatic body enclosing said first body and slidable in said casing 1n a direction normal to the sliding movement of said first body and means for adjusting the position of said eccentric journal with respect to the axis of said casing to vary the capacity of said pump.

4. The structure as in claim --3 wherein the means for adjusting the position of said eccentric comprises means to vary the eccentricity of said journal with respect to the axis of said asing.

5. A revolving cylinder and reciprocat ing-piston pump comprising in combination a casin a rotatable disc, a prismatic body 130 adapte to slide radially in said rotatable disc, a second prismatic body adapted to slide radially in the first named prismatic body, the directions of movement of the two sliding bodies being at right angles to each other, a journal eccentrically mounted in the casing of the pump, said journal carrying the two said prismatic bodles, a distributer sleeve surrounding said rotatable disc and formed with peripheral suction and dis-' charge passages, and communication pasprovision of mea for altering the capacity sages connecting the working spaces formed of the pump by a tering the distance between 10 between the two sliding prismatic bodies and the center of the said journal and the cenbetween the outer prismatic body and the to ter of the said rotating disc, substantially 5 tating disc with said suction and discharge as described.

passa es,'substantially as described. In testimony whereof, I have signed my 6. a revolving cylinder and reciprocatname to this specification. ing-piston pump according to claim 5, the EDUARD PELICH.

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