Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1976-11-12
1979-03-20
Vrablik, John J.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
418189, 418191, 418196, 418206, F01C 108, F01C 118, F01C 2100
Patent
active
041451686
ABSTRACT:
A positive displacement device utilizing at least two rotors which roll sealingly on one another at a common pitch surface speed. Outwardly extending lobes on one rotor sealing engage the cylindrical bore of the housing of the device, fluid traversing the device circumferentially in the annulus between such bore and the pitch surface of the rotor. Speed of rotation of the two rotors is controlled by a timing chain running between sprockets mounted on the rotor shafts.
When the lobe passes the line of sealing contact, a cavity is provided in the meshing rotor, and the lobe makes sealing contact with the wall of this cavity during at least that interval when there is no sealing contact between the pitch surfaces, i.e., the interval when the mouth of the cavity is passing through dead center. The inventor shows that the cavity is a modified path he calls the reentrant loop of an endoepicycloid, which is the path of the tip of a fixed radial extension of one circle as it rolls without slipping around the circumference of a second, fixed circle. From this he shows that, to accommodate a lobe having the general shape of an isoceles triangle truncated or blunted by a radial tip, the endoepicycloid should be split into two halves which are moved apart circumferentially the length of the arc of the lobe tip, and the inside ends of the halves joined by an arc centered on the center of the cavity rotor. Further modifications such as undercutting to avoid double sealing are also described.
REFERENCES:
patent: 378042 (1888-02-01), Dow
patent: 1382580 (1921-06-01), Webb
patent: 3089638 (1963-05-01), Rose
patent: 3574490 (1971-04-01), Hartmann et al.
patent: 3584984 (1971-06-01), Majkowski et al.
patent: 3612735 (1971-10-01), Graham
Smith, Jr. Roy H.
Travis Bobby J.
Smith, Jr. Roy H.
Travis Bobby J.
Vrablik John J.
LandOfFree
Fluid flow rotating machinery of lobe type does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid flow rotating machinery of lobe type, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid flow rotating machinery of lobe type will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-218713