Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1995-03-03
1996-09-24
Vrablik, John J.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
418159, 418264, F01C 1344, F01C 2112
Patent
active
055585116
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sliding vane machine with a cylindrical rotor, eccentrically placed in a housing, said rotor being rotatably mounted in the housing by means of a drive shaft, the periphery of the rotor touching the interior of the housing at one point, as seen in a plane perpendicular to the rotational axis of the rotor, which is provided with a number of vanes, which are guided in slots in the rotor for essentially radial movement relative thereto, said vanes delimiting, together with the rotor and the housing, chambers for transferring a medium from an inlet opening in the housing to a delivery opening in the housing.
Sliding vane machines of this type are well known and are used, e.g. as pumps and compressors for gaseous media of various types. One problem with these known sliding vane machines is to achieve an effective seal between the radially distal ends of the vanes and the interior of the surrounding housing. It is common to allow the distal ends of the vanes to abut against the housing, either directly or via some form of sealing strip. This gives rise, however, to appreciable friction and wear and dimensions and rpm must be kept down, since the centrifugal force on the vanes would otherwise increase the friction and wear dramatically.
These problems have limited previously known sliding vane machines to being relatively small and operating at relatively low rpm. The capacity of these known sliding vane machines has thus been relatively low.
The purpose of the present invention is to provide a sliding vane machine, in which the above mentioned problems have been solved and which can work at a higher rpm and be made with larger dimensions without friction and wear giving rise to problems.
This is achieved according to the invention by virtue of the fact that the movement of each of the vanes relative to the rotor is guided by means of at least one guide means, which runs along a guide race in the housing, said guide race and/or the interior of the housing, as seen in a plane perpendicular to the rotational axis of the rotor, having such shape that the radially distal end of each vane follows the contour of the interior of the housing.
With this construction the path of movement of the radially distal end of each of the vanes is adapted so that a very small gap is maintained between the vane and the housing without any direct contact. This avoids the problem with friction and wear at the same time as correct dimensioning can reduce the gap between the vane and the housing so that loss due to leakage between the vane and the housing is kept at a very low level.
The invention will be described in more detail below with reference to the accompanying drawings, of which
FIG. 1 is an end view of a sliding vane machine according to one embodiment of the invention,
FIG. 2 shows a section through a sliding vane machine, somewhat modified from the machine shown in FIG. 1, in the vicinity of the end plate of the sliding vane machine,
FIG. 3 shows a section through the sliding vane machine according to FIG. 2, in the vicinity of the centre of the rotor,
FIG. 4 is a partially cut-away side view of the sliding vane machine according to FIGS. 2 and 3, with certain parts removed,
FIG. 5 shows an axial section through a somewhat schematically shown sliding vane machine according to the invention,
FIG. 6 is a schematic figure, which in exaggerated form shows the contour of the interior of the housing of a sliding vane machine according to the invention inscribed in a circle.
FIG. 1 shows a sliding vane machine according to the invention as seen from one end. The sliding vane machine comprises a housing 1, which is constructed of two end pieces 2, 3 and an intermediate shell 4. The housing 1 is provided in the embodiment shown along a portion of its circumference with cooling flanges 5. Furthermore the housing 1 is provided with an entry duct 6 and a delivery duct 7 for connection to an intake conduct and a delivery conduct, respectively (not shown). FIG. 1 shows also a drive shaft 8 for driving the slidin
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patent: 2469714 (1949-05-01), Cooper
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patent: 4272227 (1981-06-01), Woodruff
patent: 4410305 (1983-10-01), Shank et al.
patent: 5160252 (1992-11-01), Edwards
patent: 5181843 (1993-01-01), Hekman et al.
Fanja Ltd.
Vrablik John J.
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