US1297693A - Rotary fluid-pressure device. - Google Patents

Description

O. W. JOHNSON.

ROTARY FLUID PRESSURE DEVIGE.

APPLICATION FILED APR. 10. I9II.

1,2975%. Patented Mar. 18, 1919.

2 SHEETS-SHEET l- INVE/VTUR 47770 W. JUH/VS'U/V BY ht I 0. W. JOHNSON.

ROTARY FLUED PRESSUREVDEVICE.

APPLICATION men APR. 10, 1911.

MD N

Patented Mar. 18, 1919.

2 SHEETSSHEET 2- reducing loss by. friction Y horizontal casmg, having-- which can be used for the duit,.said-conduits be 'and useful Improvements in. Rotary In the accompanying drawings,

' zontal section are hollow end casings UN T D STATES PATENTOFFICE.

" OTTO W. JOHNSON, OF SAN FRANCISCO;

stormy rnurn-rnnssuan Device To all whom it may concern:

Be it known that I,.O'rro VV JoHNsoN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new Fluid- Pressure Devices, of which the following is a specification.

The present ments in rotary able varies for transmitting power, such as fluid-operated motors or pumps.

' Such rota devices are rendered inefiicient by the act that the pressure between the shaft and the bearings is very many times as t as that on the vanes, because the efl'ective area of each vaneis very much less. than that part of the area of the rotor upon which there is a pressure equal to that on the vane. Therefore the friction betwee invention relates to improve fraction. of the ressure between the surfaces of the shaft and tion of the elfective pressure. Hence the loss of efiiciency is very considerable.

The object of the resent invention is to provide means for re ucing this loss.

A further object'is to provide means for between the shaft and ring-carrying vanes.

t Figure 1 is a longitudinal vertical section of a rotary device of the character described constructed in accordance with my invention; Figs. 2 and 3 are vertical sectional views on the lines 2-2 and 3-3 respectively; Fig. 4 is a horiand parts carried thereby.

view of a shaft 1 indicates a Referring the drawing, 0 duits 3, either of et or outlet conmghada ted to be connected respectively wit 1n et and outlet pipes, not shown. Oonne.cted by bolts 4 ,to the ends of said casmg, but eccentric thereto, or heads 6, 7 through havin therewith a base 2 .and co ke ed thereto, as shown. at ho low rotor 11 coaxially with said heads and having extensions extension 12 is integral with the rotor, and the extension 13 is secured thereto by bolts 14. The rotor 11 is contained in the casing 1, but is eccentric thereto, and the extensions Specification of Letters Patent.

devices which employ movis a ring'23, from tween packing pieces 34 in said the bearings,is a large frac.

thereof; Fig. 5 is a plan view of a rotor detached; Fig. 6 is a broken plan rmed integral 12, 13, of whichthe 12,- 13, extend into pressure chambers 16 for ed in saidheads 6, 7, with,- and formed by a cylindrical wall 17 extending inwardly, or toward the rotor 11, fromthe outer plane wall of said head.

The head 6 is reduced in diameter, as shown at 18 and aroundthe same can rotate a cylin rical flange19, extending coaxially with the shaft from the extension 13. Said head is still further reduced in diameter, as shown at 21, and around the same can rotate a bushing 22. Around said bushing which extends integrally a vane 24 and also two pairs of rings 26, 27, from which pairs extend integrally vanes 28 and 29 respectively. The vane 28 is keyed to the bushing, as shown at 31, but the other vanes are loose thereon. All of these wanes extend through longitudinally extending cylindrical openings32 in thickened portions 33 of the wall of the rotor, and slide becylindrical openings, the outer surfaces of said piews being cylindricaljand the inner surfaces being plane to fit smoothly agalnst the plane and coaxial there- Patented Mar. 18, 1919'. t

' Application filed April 10, 1917. Serial No. 160,922. I

Such being the construction, if pressure\ fluid be introduced between one duits, it the vanes in succession and will escape by the of said con- Wll'l rotate the rotor by impelling other conduit and, conversely, if the rotor be rotated by an external force, its-vanes will draw in fluid .by one of said conduits and propel it through the other.

It will be transmit pressure not only to the surface of the vane to propel the rotor, but will transmit the same pressure to the curved surface of the rotor itself, which, being coaxial with the shaft, is ineflective for propelling the rotor, and it will also be seen that the area of this latter surface is very many times as great as that .of the former. The friction between the rotor shaft and its bearings depends upon the latter pressure, and while this friction might be negligible if it depended only able-when it depends upon thepressure {exerted upon the rotor, and the loss of efliciency from this causeh'as been supposed to be about from 15% to.25%.'

In my invention I remove this useless pressure of the rotor in the following manner:

seen that the pressure fluid will From each of the divisions, or sections,

of the rotor between as the case may be.

'pairs of vanes,'and midway between said vanes, there extends at each end ofthe rotor a conduit 37 leading from the fluid pressure chamber 38, inclosed by the vanes, the casing, the rotor and the heads, to a chamber 39 in the adjacent head on the inner side of the extension 12, or 13,

The extensions are so. formed that the pressure fluid escaping through said conduits 37 from the fluid pressure chamber 38 cannot escape from said pressure chamber- 39 The combined lengths of the pressure chambers 39 are equal to the length of the pressure chamber 38, and since, the radii of the rotor and extensions is the same, the combined areas of the extensions on which there .iseutward pressure is equal to the area of the rotor on which there is an equal inward pressure. Consequently, no

pressure on the rotor due to the pressure fluid is transmitted to the shaft.

The advantage of providing a bushing be-' tween the reduced portion 21 of the head and the rings carrying the vanes is that the rotary movementof the vanes and ringsrelatively to each other, and, therefore, also of j the bushing which is secured to one of the vanes, is but slight, and there is "very little .wear thereon, and while there is considerable relative movement, and consequent Wear, between the vanes and the reduced portion of the head, this is taken up by the bushing, which can easily be'replaced from time to time. 7 I p Since all of the vanes are mounted on the bushing, the centrifugal forces acting on the vanes will practically counter balance each ing therethrough memes other, so that the forceactingin the bushing cause will be practically elimldue to this nated. 1

I claim x 1. The combination of a casing having inlet and outlet passages and end casings, a

rotor rotating, in said central casing and ing extensions into said end casings, said extensions forming pressure chambers in their inner sides, vanes forming, With said rotor and easing, central pressure chambers, and said rotor having oblong conduits leadfrom each of the latter pressure chambers to a corresponding one of the former chambers. I

3. The combination of a shaft, a casing ec centricallysurrounding said shaft, a rotor within said casing and concentrically S111? rounding said shaft,a bearing for the shaft having a cylindrical extension eccentrically surrounding said shaft, a bushing around" and rings around the bushsaid extension, ing and having vanes extending holes in the rotor and contacting at their outer edges with said casing, one of said rings being secured to the bushin OTTO W. JO SON.

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