US2538598A

US2538598A - Rotary machine

Info

Publication number: US2538598A
Application number: US794557A
Authority: US
Inventors: Stratveit Nils Nilsen
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-12-31
Filing date: 1947-12-30
Publication date: 1951-01-16
Anticipated expiration: 1968-01-16

Description

Jan. 16, 1951 N. N. sTRATvElT ROTARY MACHINE n We. 7

a. rj

Filed Dec.

Patented Jan. 16, 1951 Nils Nilsen Strtveit, Oslo, Norway Application December 30, 1947, Serial No. 794,557 In Sweden December 31, 1946 I Claims. l This'inventionrelates to rotary machines having a piston that doesvnot rotate about its own axis and that operates in a working space bounded by stationary end walls. The movement of the piston may for instance be such that all 'points on the piston move in circular orbits of equal radii.

Such a rotary machine may be used as compresser, as pump or as motor.

The main characterising feature of the present prises a housing I having two plane end walls 2 invention consists inthat the transmission of power between the driving shaft and the piston is effected by means of organs rigidly secured to the piston at the ends of the latter.

In a` preferred embodiment of the invention the power transmitting organs extend through one or more of the stationary end walls, but the invention is not restricted to such feature.

Suitably the power transmission organs may consist of pins or studs extending in parallel to and 3 respectively,` between which are provided two concentric cylinder walls, 4 and 5 respectively.Y Between said cylinder walls is coniined the; annular working chamber 6. The inlet I and the outlet 8 of the chamber E are provided in the outer cylinder wall 5. Between said inlet and outlet extends a radial wall 9, which separates the high pressure side from the low pressure side.

Within the annular working chamber 6 operates the piston I0. Also the piston is of annular Ithe driving shaft through openings in the end walls of the working space and being, at the inner side of said walls, rigidly secured to the piston, and being'each, exterior of said walls, connected to a disc that extends at right angles to theshaft and is rotatable on ycrankV pins carried by the 'driving shaft.

Said openings in the end walls of the working chamber may suitably have circular cross section and be sealed by rotatable, disc-shaped sealing organs through which the power transmission organs extend. Such sealing organs then simultaneously may serve to guide the movement of the piston.

The invention will be more fully explained with referenceto the drawing.

In the drawing:

Figure is a sectional view of an embodiment,

the section being taken on line I-I of Fig.- 2 and Figure 2 shows a section taken on line II--II of Fig. 1. o

Figure 3 is a broken sectional View illustrating a modification of Figure 1.

Figures 4 and 5 are sectional views of another embodiment ofthe invention, the sections being taken on line IV-IV off Fig. 5 and on line VV of Fig. 4, respectively.

Figure 6 is a Vertical section of a detail on Fig. 4, onl a larger scale, and

Figure 7 is a Vertical section 'of a modification of said detail, whereas Figure 8 is a side view corresponding to Fig. '7.

Figure 9 is a sectional view similar to Fig. 3 but shows still another embodiment.

The machine shown on Figures 1 and 2 com- '2 sealed off.

shape but it is provided with an yaxial slot at the location of wall 9. This slot is necessary in order that the piston shall be able to move unhindered by wall 9. vThe piston is hollow and the thickness thereof is relatively great. On each end the piston is provided with four pins or studs Il. These are rigidly secured to the piston and extend through openings I2 in the end walls of the working chamber. Pins II are rigidly connected to discs I3 or I4 respectively. Said discs rare journalled at I5 and I6 respectively on an eccentric shaft I'I mounted in the housing I by means of bearings I3 and I 9. The piston I0 does not rotate about its own axis, but may, for instance, have such motion that all points on the saine are moving in circular orbits the radii of which are equal to the eccentricity of the shaft.

Those portions of the openings I2 that are not at all times taken up by the pins II must be In the embodiment illustrated on Figures 1 and 2 this is accomplished by giving the piston a thickness somewhat larger than the sum of extension of the pins or studs in radial direction and the eccentricity e of the shaft I'I multiplied by 4. Thefend faces of the piston then 'will act as sealing `organs for the openings.

In the embodiment shown on Figure 3 the openings I2 are sealed by meansof anges 20 secured to the piston at the ends of the same. Said flanges are received in pockets 2l extending radially inwards from the working chamber 6, along the

end walls

2 and 3 respectively. Apparently the flanges might as well extend radially outwards and be received in corresponding outwardly directed pockets, or the anges might extend both outwards and inwards.

In the embodiment disclosed on Figures 4 and 5 the openings I2 are sealed by means of special sealing organs.

The openings I2 then suitably may be circular and the sealing organs consist of circular discs 22, each rotatably mounted in an opening. The

pins II may extend through eccentrically ar- 3 ranged apertures 23 in the discs. By the use of a su'icient number of pins H the circular sealing organs may at the same time serve to guide the movements of the piston in such manner that all points on the piston move in circular orbits having radii equal to the eccentricity of the shaft.

Figures 6 and 7, 8 show, on a larger scale, details of such sealing organs.

On Figure 6 the Iaperture 23 through which a pin Il extends has somewhat greater diameter than the pin, in order to avoid excessive fric'- tion. The pins are supposed to be rigidly confA nected to the piston IB, so that the pinswill rotate relatively to the sealing organs -22. :In order to obtain' effective sealing in spite of the play between pin Il and disc 22,1t1'i'ere'is provided v"'a sealing disc 24 abutting against the edgepo'rtin's of aperture 23 at one end thereof. Suitably VIthe sealing disc 24 may be arranged counter-sunk in a cavityf25 milled in the disc 22.

Due to the play between pin i I and disc v22 the construction just described does not V.provide {ora fully effective guiding o'f the movements 'of `the piston. Figures 7 and 8 illustrate .how such guiding may become ent-irely eiective. In v.',tl1eape1-ture '26,vthrough Which-pin Il extends,

isplaced a sleeve 2l'. iSaid sleeve 'has an openl' t.ing 28 therethrough of extended cross section.

inder walls through said axial slot in said piston and having fluid tight contact with the outer cylinder wall between said inlet and said outlet, an eccentric shaft rotatably mounted in said housing, a disc journalled on said shaft externally to said housing at each end thereof, said end Walls having openings therethrough adjacent saidpiston, pins rigidly connecting said discs and said piston extending 'through said'openings in said end walls, said pins constituting means for `transmission of power to or from said piston.

2. A rotary machine as claimed in claim 1, said openings through said end walls being elongated, said piston having a thickness greater than the openings in said end Walls through which the v`power :transmission pins extend, said pins being 'soarranged with respect to said piston and said discs' that the piston end Walls form sealing means for said openings in said end walls.

r.3.A- ,rotary machine as claimed in claim 1, sealing-.'iianges on rsaidpistonat the ends thereof extending :atright angles lto the machine axis andslidablyfco-acting with lthe openings insaid end walls.

4. A rotary machine as claimedin claim 3,

Y the inner of said concentric cylinder wallsbing The largest dimension of the cross section is l greater than the diameter of stud lvl, whereas .the smallest dimension of the cross section is .less'than said diameter. The opening A28 has ltwo Aparallel opposite side faces 29 and the pin ily] is shaped correspondingly, so that it may slide Fup and down within the opening '28, but caniit move transversely thereto. manner as explained in connect-ion with Figure ifth'epin "H is also in Figure 7 provided with a "3`5 In the same sealing disc "24 placed in a cut-out 25 in they V`dise '22.

, Aboveare described embodiments in which the 'power transmission organs extend through the `stationary end -walls of the working chamber.

Even if thisis considered the preferred 'form of fthe invention, a construction. asiilustrated on'Fig- .Li1re9 will alsobepossible. I-'Iere the power transmission organs A3@ are arranged at the vinner side 4of thetend Walls of the working'chamber and eX- -tend through the inner wall of said working :chamber: 'I`he organs"3ll, which may 'have Ydisc shape, are provided with apertures through vwhich lpass axially extending parts -32 connecting the .inner Wall `4 of the working Ychamber with the ,end walls 2Y and 3 thereof.

- I `I claim:

1. `A rotarymachine comprising .a housinglhaving spaced plane-end walls, two spaced concentric cylinder Walls secured between said plane end Ywalls and forming therebetween 4an annular workingchamben-the outer of said Vcylinder Walls ,having an inlet and an .outletfor said working .chamber therethrough, an annular shapedfpiston in `said Working Ychamber having an axial slot therein, a radial wall extending between said planeend walls and from the inner of said cyloffset adjacent the ends thereof to vform pockets in said working chamber viorreceiving said sealing flanges. v

t 5. A rotary'machine -as claimed in claim 1, lsaid openings in said .end walls being cylindrical, .circular sealing discsinsertedlin said openings, said circular discshaving eccentrically arranged kapertures therethrough andfsaid pins extending' through `saidfapertures insaid circular discs, said `circular discs.constitutingsealing organs for said machine, said sealingorgans together with said pins serving as guiding organsior themovement .of thefpiston. Y

`6. `VA yrotary machine as claimed in claim l, said .pins constituting meansior Atransmission of power being cylindrical :and extending parallel to Athe driving shaft and through said .openings Y-in .theend walls `ol? the workingchamber, 'said .pins being, at -theinnel` side of said walls, rigidly secured to the piston and said disc-beingrigidly thereon, .outside ofsaid walls, at each machine side, said Vdisc being krotatable Lon said eccentric shaft. Y Y

7. rotary machine as claimed in '-claim y6, .in which `the diameters of Vsaid 4openings .are

-greater than those -of said pinssaidpins carryy The -Vfollowing `references are '-of Vrecord "in I:the le of `this 'l'patentt UNITED STATES PAILN TS Number