US1715629A

US1715629A - Rotary compressor

Info

Publication number: US1715629A
Application number: US160194A
Authority: US
Inventors: William E Shore
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-01-10
Filing date: 1927-01-10
Publication date: 1929-06-04
Anticipated expiration: 1946-06-04

Description

June 4, 1929. w. :E. SHORE 15,62

ROTARY COMPRESSOR F iled Jan. 10, 1927 Maia/"2.52m. 7 "f" Patented June 4, 192 9.

"UNITED STATES PIJATENT errlca.

wnmarrn'snonn, or WEST nnw BRIGHTON, NEW YORK no'ramz comrnnssoa,

Application filed January 10, 1927. Serial No. 160,194.

vane comprising a rigid unit operating in' balanced and sealed arrangement in bothof said cylinders, said vanes rotating about changing axes and maintaining constant contact with the cylinder surface, each rotor supporting the vane in the adjacent cylinder so as to eliminate destructive end thrust and maintaining constant contact of both ends of the vane with its cylinder wall. In the drawings, Figure 1 is a longitudinal mid-sectional view taken through the casing of my improved double cylinder pump, the rotor and impeller vane being shown in clevation.

' Figure 2 is a part cross sectional view through the pump on the line 2-2 of Figure 1.

Figure 3 is a diagram illustrating the peculiar shape of the cylinder chambers and the path of movement of the impeller vanes.

In the construction of I the pump herein shown, the cylindercasing 1- is open at one cent to the bearing end 3 is provided with a c lindrical recess i concentric with the axis of the hearing. A rotor 5 rigidly secured to the shaft 6 is provided with a cylindrical portion 4 7 journalled in the recess 4. The main portion of the rotor arranged 'eccentrically within the cylinder chamber engages the division wall 8 which separates the intake from the discharge side and it is formed with a dia- 4 metrically arranged parallel faced slot 8 to receive the impeller vane 10. Recesses 9 are arranged each side of the division wall com? J municating with the eccentric-cylinder chamber.

The cylinder cavity is of a peculiar-formation, the transverse axis A through the centre of the division wall 8 being arranged in alignment with the axis ofthe rotor 5, the rotor axis bein offset laterally from the centre of the cylin or so that the periphery of the side and is provided with a flange 2 and adjarotor engages the division wall at one side but is spaced from the cylinder wall forming a crescent-shaped cylinder chamber.

a The diameter of the cylinder perpendicular to the transverse axis AA is greater than the diameter through said transverse axis and li the walls are therefore eccentric each side of the transverse axis. This eccentricity is provided to accommodate the impeller vane 10.

This vane has a maximum length substantially equal to but a trifle less than the minimum diameter of the cylinder on the transverse axis A-A,' which as the rotor rotates, moves about a constantly changing axis.

The peculiarties of the construction of the cylinder arefully described in my co-pcnding application, Serial No. 160,193 filed January 10, 192?,for rotary compressors which illustrates the single cylinder construction. The present invention constitutes a double cylind er construction and a cylinder casing 11 similar to the casing 1 is provided with a flange 12 which abuts the flange 2. Countersunk recesses 2 and 12 are arranged in the abutting faces of the flanges 2 and 12 and within the recess thus formed is secured a ring 13 which forms a partition wall interposed between and engaging the adjacent inward end faces of the rotor and closes the outer end of the cylinder chamber 1 in the cylinder casing 1 and also the chamber 11' in the cylinder casing 11.

A rotor 14 arranged within the cylinder chamber 11' is formed with an annular flange 15 which 'iournals in the partition ring-13 to centralizeth'e rotor 14. The rotor 14 is arranged in diametrically opposite eccentric relation to the rotor 5 and an impeller vane 16 similar to the impeller vane 10 is slidable in the transverse slot 17 therein.

The

impeller vanes

10 and 16 are arranged in right angular relation to each other and are rigidly connected together in a unitary structure by a disc 18, which forms a part thereof. This disc is free to oscillate in the space inside of the inner flange 15 of the rotor 14.

It will be seen that in a pump constructed as described, the rotor 5 propels the vane 10 in the cylinder chamber 1' and as it rotates it draws in through the intake :2: and discharges from the discharge 11 The rotor 14 which has its transverse slot in which the impeller vane 16 slides arranged at right angles to the impeller vane 10 su ports the impeller vane 10 centrally in relation to the cylinder chamnating end thrust and the consequent wearthe vane and thus maintaining constant contact with her 1', thus preventing the vane from throwing to either one side or the other and elimiof the cylinder and the end of th cylinder at both ends of the vane.

As the blades are integrally connected, the movement of the vane 10 carries the vane 16 with it and the disc 18'carries the rotor 14 around within the cylinder 11. The vane 16 iscentralized in relation to its cylinder by the vane 10, consequently'each vane centralizes the other and the action of centrifugal force is controlled.

It will be understood from this description that the working parts are reduced to the very minimum and there is no unnecessary loss in friction in a high speed device, as each rotor functions in regard to the pumping action and also acts as a centralizer for the impeller vane of the adjacent cylinder.

In the drawings I have shown the rotor 14 provided with a cylindrical extension 19 similar to the extension 7 of the rotor 5 and a hearing shaft 20 is also shown but these may, if desired, be eliminated.

The diagrammatic illustration in Figure 3 shows the eccentric formation of the c linder walls in exaggerated form. It will seen on reference to this dia ram that if a line CC.is drawn through t e lonigtudinal axis of the rotor 5 perpen icular to the line A-A and of the same length, the ends of the line C-C-would extend beyond the circle X. It will be notedthat the centre B of the cylinder and the centre D of the rotor are transversely in line and that a line drawn through said centres will be the true diameter of the circle described about B but if the line is caused to move about the centre D and must remain the same length, then the moment that the rotor rotates to swing the line A-A out of the vertical on account of the difference in centres between the cylinder and the rotor the ends of the line if retained in balanced arrangement at either side must extend beyond the cylinder circle, first in increasing ratio which reaches the maximum when the line is in the position CC. It then reduces and draws inwardly until it again merges into the true circle on the vertical axis A-A. The line (1-0 indicates the position of the centre line of the blade when said blade is perpendicular to the line that cuts both cylinder and rotor centre but other lines E-E and F-.-F are shown at 45-angles merely to illustrate the centre line of the blade at different points.

The pump thus described may be operated with the cylinders inter-connected to stage the compression, that is, the discharge from one o linder may be connected with the intake of t e other or the cylinders can be operated independently.

()n account of the practically perfect balancing of the impeller vanes, friction and posite relation t wear from centrifugal force is overcome in a perfectly manner and a very efiicient pump is produced.

' It will be understood that the terms contact, constant contactl, or similar expressions in the foregoing specification and appended claims do not mean an actual metalto-metal contact between the ends of the vanes and the inner surfaces of the respective cylinders, but simply that the ends of the vanes are so close to the surfaces of the respective cylinders as to effect a sealing or operating contact with such surfaces. Though in the specification and claims I have termed my device a compressor, it will be understood that its use does not necessarily involve the build-' ing up of any particular degree ofpressure. In the expanding chamber a degree of vacuumis ordinarily present. The pressure at the outlet end of the device obviously depends upon the conditions and may be greater than or equal to, or. less than atmospheric pressure. The word com ressor as herein used is to be so understoodi I What I claim as my invention is:

1. A rotary compressor "comprising a pair of pump cylinders arranged in eccentric relation the one to the other each bein open at one end and having their open en s connected to ether, rotors eccentrically mounted in each of said cylinders in diametrically ope one to the other and each having a transverse slot extending axiall therethrough, a ring secured between the ac jaeent ends of said cylinders and engaging the adjacent end faces of said rotors and closing the adjacent ends of each of the chambers formed between said rotors and their respeetive cylinders, and a pair of impeller vanes rigidly connected 1n ri htangular relation to each other and slidalily arranged in the transverse slots in said rotors, the adjacent edges of said vanes enga ing the opposite faces of said ring, each 0% orting the impeller vane in the other rotor 1n constant contact at both ends with its cylinder wall free from end thrust.

2. A rotary compressor, comprising a pair of cylinder casings each open at one end and secured together at their open ends with their axes otl'set, rotors formed of a pair of solid circular members mounted eccentrically in said cylinders and each having a transverse slot extending .axially therethrough, an annular flange secured between the ends of said cylinders and engagin in constant contact with the end surfaces 0 the solid circular end faces of said rotors and separating the chambers of said cylinders, and a pair of flat vanes rigidly connected and arranged at right angles to each other and slidably engaging the walls of the slots in said rotors, the adjacent edges of said vanes engaging the annular flange separating said rotors.

3. A rotary compressor, comprising a pair said rotors sup:

the other of cylinders each open at one end and having the 0 en ends connected together with the cylin er axes ofiset, an annular flange secured between said cylinders at their open ends, a rotor eccentrically journalled in one of said cylinders, a rotor journalled in said annular flange and supported eccentrically in the other cylinder, transverse slots extending diametrically through each of said rotors and presenting continuous parallel faces, and an impeller vane comprising a pair of blades formed of a unitary block of material arranged at right angles to each other and each having continuous parallel faces, one blade extending into the transverse slot in one rotor and the other extending into the transverse slot in the other rotor and each having continuous surface contact with the faces of the rotor slot, each of said rotors operating to sup ort the vane of the other rotor with its en s in constant contact with the cylinder surface in the rotation of the rotor.

4. A rotary compressor, comprising a pair of cylinder casings each having an intake chamber and a discharge chamber separated by a narrow portion of the cylinder Walls, said cylinders being arranged with said intake and discharge chambers in diametrically opposite position and with their axes oflset, an annular flange arranged between said cylinders, a rotor eccentrically mounted in one cylinder having its periphery engaging the cylinder wall at the narrow portion separating the intake chamber from the discharge chamber, a rotor mounted in said annular flange and eccentrically supported in cylinder to engage the portion dividin its ischargechamber from its intake cham er, the cylinder chambers between the respective rotors and cylinders being separated by said annular flange which engages the inward end faces of said rotors, each of said rotors having diametrically arranged slots extendin therethrough presenting continuous parallel surfaces, andan impeller vane formed of a pair of flat bladesforming a unitary part of a central disc, said vanes engaging the slots in said rotor in continuous surface contact across the diameter of the rotor and extending in right angular relation to each other and adapted to be supported each by the opposite rotor within their operating cylinders free from contact with their cylinder walls through centrifugal force.

5. A rotary compressor, comprising a pair of pum cylinders arranged in eccentric relation t e one to the other, each being open at one end and having their opened ends connected together, rotors eccentrically mounted in each of said 0 linders in diametrically opposite relation the one to the other and each having a transverse slot extending transversely through its axis, a pair of Impeller vanes rigidly connected in ri ht-angular relation to each other and slidal ly arranged in the transverse slots in said rotors, and a ring secured between the adjacent ends of said cylinders and closing the adjacent ends of each of the chambers and their respective cylinders, the adjacent parallel surfaces of said vanes engaging the opposite faces of said rin each of said rotors supporting the impel er vane in the other rotor in constant contact at both ends with its cylinder wall and free from destructive end thrust there: against.

WILLIAM E. SHORE.