Rotary expansible chamber devices – With mechanical sealing – Seal on cylinder engaging rotary member separates inlet and...
Patent
1996-04-18
1997-11-25
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
Seal on cylinder engaging rotary member separates inlet and...
418170, F01C 110
Patent
active
056904819
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an internal-gear machine, in particular an internal-gear pump.
Such an internal-gear machine with a filling portion which is divided into two filling portion parts along a separation surface is known for example from DE 29 54 546 C2. In that arrangement the filling portion is in the shape of half a sickle. The openings which extend from the separation surface of the filling portion in that known internal-gear machine are of such a configuration that the wedge surfaces of the two openings are oriented in the same direction, that is to say in a direction from the pressure side to the suction intake side of the internal-gear machine. The spring elements which are used in that known internal-gear machine are in the form of singly cambered or corrugated leaf springs, and they are at most of a longitudinal dimension which corresponds to the thickness of the filling portion. Spring elements of that kind not only have a relatively hard springing characteristic in particular as a result of the low degree of curvature or corrugation, but in particular also the arrangement thereof in the openings or in the residual space in each opening which is correspondingly reduced by the presence of the respective sealing roller therein is very expensive, which must be considered as a disadvantage.
A similar internal-gear machine, that is to say an internal-gear machine having a filling portion which is in the form of half a sickle and which is divided into two filling portion parts along a separation surface extending substantially in the peripheral direction is also known from DE 29 42 417 C2. That known internal-gear machine also provides that mutually oppositely disposed openings extend from the separation surface; in those openings, the inclined surfaces which form the wedge surfaces are oriented in the same direction, that is to say from the pressure chamber to the suction chamber of the internal-gear machine. In regard to the configuration and fitting of the spring elements, the points set forth above in relation to DE 29 54 546 C2 also correspondingly apply to that known internal-gear machine, that is to say in that case also the arrangement affords only a relatively hard springing characteristic, as well as involving the shortcoming of a considerable amount of time being required in fitting of the spring elements in the receiving space for the associated spring element, such space being reduced by virtue of the presence of the corresponding sealing roller. A relatively hard springing characteristic of that kind also has a corresponding effect on the service life and on the running qualities of the internal-gear machine.
DE 37 23 557 A1 also discloses an internal-gear machine with a filling portion of a half-sickle shape, which is divided into two filling portion parts along a separation surface extending substantially in the peripheral direction. In that known internal-gear machine the filling portion of the half-sickle shape is supported rotatably and displaceably on the casing by at least one mounting trunnion or filling portion pin mounted rotatably in a bore in the casing, and a mounting body which is displaceable in a groove, wherein said mounting trunnion is arranged at a spacing from the end of the filling portion which is towards the suction chamber, the mounting body projects from the mounting trunnion and engages into a groove in one of the side or bottom surfaces of the filling portion.
An internal-gear machine with a filling portion in the form of a half sickle, which is divided into two filling portion parts along a separation surface extending substantially in the peripheral direction is also known from DE 35 44 857 A1. The filling portion parts bear with their end faces at the suction side against a support surface of a support element which axially passes through the space between the internally toothed annular gear and the externally toothed pinion, in such a way that the filling portion parts are displaceable in a radial direction on the support surface and pivotable about a pivo
REFERENCES:
patent: 2482713 (1949-09-01), Jones
patent: 3890066 (1975-06-01), Eckerle
patent: 4472123 (1984-09-01), Eckerle et al.
Eckerle Industrie-Elektronik GmbH
Vrablik John J.
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