US1989864A - Rotary pump - Google Patents

Description

Feb. 5, 1935 J. F. JAwoRowsKl ROTARY PUMP 1933 2 Sheets-Sheet l Filed Feb. 24,

Fl-a. 5, 1935. J. F. `mwoRowsKl ROTARY PUMP Filed Feb. 24,'1935 2 Sheets-Sheet 2 S Q@ .T -n .7. N @ia w WN S w mm. 5+ .rml bm.

Patented Feb. 5, 1935 UNITED sTATEs PATENT OFFICE ROTARY PUMP Joseph F. Jaworowlki, Cleveland, Ohio Application February 24. 1933, Serial No. 658,419 2 Claim. (Cl. 10S-136) This invention relates to rotary pumps or Figure 11 is a side view partly in section of compressors in which a rotor piston of the blade the plug seating check valve; and

' type is concentrically mounted within a working Figure 12 is a sectional view on line 12-12 of chamber. The pump is especially adapted for Figure 11.

5 pumping refrigerant to and through the coils Referring more particularly to the drawings, 5 and condenser of a refrigerator or arefrigerating the pump comprises a casing 1, which may be plant, which refrigerant according to common cast and provided with a base 2 for mounting practice consists of sulphur dioxide or ammonia upon any suitable support, not shown. Casing carrying a small quantity of lubricating oil. 1 comprises a. front portion 3 and a rear portion The general object ofthe invention is to pro- 4 connected together by means of bolts 5 pass- 10 vide means for separating the working chamber ing through portion 3 and threaded into portion into suction and compression areas or portions 4, the base 2 being formed on the latter portion. whereby wear on working parts of the pump will The inner periphery of the front portion 3 of the be reducedto a minimum. casing is formed with arcuate flanges 43 which Another object of the invention is to provide snugly engage in cooperating arcuate recesses 15 eccentrically mounted means within the working 44 formed in the rear portion 4, thus facilitating chamber slidably connected with and freely roassembly of the two parts of the casing, and tated by the rotor and cooperating with the rotor a dowel pin 50 serves to align and center the and its blade to separate the suction side of the bearings in the respective Parts. The front end pump from the compression side. 0f the casing is closed by a cover 20 secured in 20 A further object of the invention is to provide place by bOItS 21- A drive Shaft 6 extending a novel form of pressure relief valve for the through axially alined bores inthe front and rear discharge outlet which permits of convenient portions 0f the Casing iS held against inward assembly and disassembly of the valve. longitudinal movement by means of a collar 7 25 A still further object of the invention is toprchaving a working Clearanee with respect to 25 vide eflicient means for separating the lubricant Shoulder 8, while at its inner end the shaft is from the refrigerant and preventing the escape held against Outward movement by means 0f a of the latter from the pump. collar 9 and bolt 10. Danger of the shaft being Other objects and advantages of the invention carelessly pulled out against the sylphon bellows will be apparent as the specification is consid- 17 hereinafter referred to is thus eliminated. 30

ered with the accompanying drawings in which: The casing is formed with a circular working Figure 1 is a side view of a rotary pump acchamber 11, with which a fluid inlet passage 12 cording to the invention, the cover member and fOr the fluid being drawn into the Pump 00mthe front part of the casing being removed to municates, and from which chamber the uid is disclose the working parts'of the pump: discharged through a valved passage 13 and 35 Figure 2 is a sectional view through the pump, thence to an outlet port 27 in a manner hereinthe section being taken on line 2--2 of Figure 3; after described. A cylinder 14 of considerably Figure 3 is a longitudinal sectional view smaller diameter than and extending eccentricalthrough-the pump, the section being taken on ly through the working chamber is rotatably line 3--3 of Figure 2; supported at its ends in bearing openings or 40 Figures 4 through 8 show the parts of the recesses 15, while the intermediate portion of the disassembled pump, thus Figure 4 is a sectional Cylinder engages the upper. wall of the working view through the cover member; Figure 5 a chamber with a close working nt and thus sepsectional view through the front part of the cas arates inlet and outlet passages 12 and 13 from mg; Figure 6 a side View of the shaft with each other, and divides this chamber into suction 45 50 the rear portion of the casing;

and compression areas. The walls of bearing the 1:1301' plstn Rber achdttleret ng' openings or recessed l5, of course are eccentrically ure. a sec o. ew 0.118 e ro ata'ble arranged with respect to the axis of the working cylmder and Fgure 8 a Sectmnal View thmugh chamber 11 and also the axis of the drive shaft 6.

c The rear portion 4 of casing 1 is cored to form 50 Flgure 9 15,9' Perspective of the cylmder rtr a chamber 16 about the outer end of shaft 6, for member and its Shaft' assembled; the reception of the sylphon bellows 17, previously Figure 10 iS perspeetive view showing the referred to, and which is resiliently seated at its manner in which the cylinder and rotor are asinner end against a packing ring 18 in turn seated sembled; against collar 7 with sealing effect. A cap 19, 55

through which the outer ena of the shaft s .ex-

tends, bears against the. Aouter end plate 23 of' bellows 17 and clamps the same into tight engagement with a shoulder 24 on the casing, thus tightly sealing the chamber 16 against the escape of oil and liquid therefrom. Openings 25. through the walls of chamber 16 provide for free circulation of uid from the top to the bottom of oil chamber 47 while bores 45 permit of free circulation between the front and rear portions of chamber 47.

A rotor piston `member 26 sleeved upon and fixed to the drive shaft 6 by a key 28 is formed with an integral radially extendingpiston blade or paddle 29 which blade extends throughv a longitudinally disposed slot 30 in the cylinder 14, and into rotatable contact with the circular wall of working chamber 11. The side edges of the blade flt the corresponding edges of the slot but the sides of the blade are slightly spaced from top and bottom edges of the slot. As driring shaft 6 extends concentrically through working chamber 11 and is eccentric to thebearing openings or recesses ll5 at each side of chamber 11, in which bearings the cylinder 14 is rotatably supported or guided, it follows that the cylinder will be freely rotated in its bearings by blade 29, when the shaft is driven by any suitable source of power not shown. Slot 30 is preferably beveled, as at 31, to permit of slight relative rocking movement between the cylinder and blade which might occur in starting and stopping the pump. thus reducing frictional wear to a minimum.

In order to facilitate assembly and disassembly of the rotor 26 and cylinder 14, that portion of the rotor diametricaily opposed to tthe blade 29, is cut away or forme-:l concentric with the inner face of the cylinder, as at 46. The rotor is first slipped within the cylinder with the cut away portion 46 snugly engaging that part of the cylinder wall opposite the slot 30, and is then pushed to Figure 1 position forcing .the blade 29 through the slot and into engagement with the wall of chamber 11. The driveshaft 6 with its key 28 is then inserted through the rotor thus locking the blade in working` position. Replacements can be conveniently and quickly made.

It will be`seen that when the piston is rotated the uid is drawn through inlet 12 into the suction side of the crescent shaped working area 32 of working chamber 11, and carried around to valved outlet passage 13. Crescent shaped area .32 constitutes the space lying between the cylinder 14 and that portion of the wall of' the working chamber .which is 4out of contact with the cylinder. The fluid in advance of blade 29 is carried around by the blade to the compression side of area 32 where it is compressed before being expelled into and through the valved passage 13 and-thence, through opening 33 into the upper end of oil chamber 47. As the fluid emerges through opening 33 it impinges against a baille member 34 which causes the oil in the fluid,l where a refrigerant is being pumped, to drop downinto the lower portion of the oil chamber, while the gas content of the fluid is forced under pressure through outlet port 2'?, thus reducing the amount of oil which escapes with the gases. I'he gas is then conducted from outlet 27 to a condenser where it is liquidifled, and after being passed through an expansion valve andcooling-coll respectively again enters the pump through inlet passage 12. s the rerigerating system just devwill of course be scribed is old and well known in the art further description or illustration thereof is deemed unnecessary.

It ,will be noted that a negligible `amount of power is required to rotate the cylinder 14 for the reason that its direction of travel Acoincides with that of the liquid ow. Consequently very little wear is caused by the sliding movement of blade 29 through slot 30. As the rotor piston 'is coupled directly to the driving shaft the entire resistance of the fluid exerted against blade 29 is communicated directly to the shaft. Furthermore as the oil chamber 47 is lled with oil under constant pressure there will always be a Elm of oil between the cylinder and its end bearings, as well as between the top wall of the chamber 11 and the cylinder, thus reducing wear to a minimum at these points.

Fluid is prevented from backing up intothe pump through outlet port 2 7 and passage 13 by a metal disk shaped check valve 35, which is held movably in place adjacent the lower reduced end 36 of passage 13Vby means of a screw threaded plug 37. This member 37 is formed with a threaded head portion 38 at its outer end cooperating with the outer threaded-end of passage 13, and at its lower end is forme-d with a plurality of spaced resilient fingers 39, which i'lt loosely in that portion of passage 27 through which they exe tend. 'I'hese4 fingers are formed adjacent their extremities with recesses 40, in which the washer like disk valve is seated with freedom for sliding movement toward and away from the reduced portion 36 of passage 13. This valve `:vill seat upon and close the red eed portion 36 under pressure of liquid backing up in passage 13. One portion of a cross bore 41 through the walls of passage 13 forms the outlet 33 which communicates with the upper end of oil chamber 47 and directs the fluid pumpedfrom the working chamber l1 against baille member 34, the other end of the bore being. closed by'a plug 42. Valve 35 can readily be inserted in the recesses by springing the fingers 39 apart, and

the plug member and the valve as a whole can be removed by merely unscrewing the plug and .withdrawing the same from passage 27.

While I have shown a pump comprising but one working chamber, rotor and associated parts, it understood that any multiple thereof may be employed within the scope of my invention. Where the invention is incorporated in a double acting pump the rotor blade for one working chamber or cylinder will be directly op posite 'the rotor blade or paddle for the other working chamber or cylinder.

Having thus described my invention:

What I claim as my inrention is:

1. In a rotary pump having a working chamber including inlet and outlet passages, an axially rotatable, hollow cylindrical-member extending eccentrically through said chamber and contacting with the wall thereof between said inlet and outlet passages a rotor member within said cylindrical member arranged concentrically with respect to said chamber, a driving extension on said rotor member extending into said working *chamber through a slot in the wall of said cylinpreviously referred to and a rotor concentrically arranged within said chamber, an axially rotatable slotted cylinder ofsmaller cross section than said working chamber eccentrically mounted with respect to said workin'g chamber for subdividing same into suction and compression areas, a driving extension on said rotor member extending into said working chamber through the slot in the wall of said cylinder for rotating same and forming a paddle in 10 said working chamber, said rotor and its driving extension being dimensioned to be freely extended into and withdrawn from the interior of said rotatable cylinder, said rotor having its wall diametrically opposite said extension partly cut away to facilitate assembly and disassembly of the rotor and cylinder and thereby increase the available eccentrlcity of the cylinder with respect to the working chamber.

JOSEPH F. JAWOROWSKI.

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