Rotary expansible chamber devices – Resilient working member – cylinder or partition
Patent
1996-04-10
1998-01-20
Vrablik, John J.
Rotary expansible chamber devices
Resilient working member, cylinder or partition
418258, F04C 2344
Patent
active
057095400
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a rotary pump comprising a stator pierced with a housing delimited by a cylindrical sidewall, a cylindrical rotor located inside the housing, tangential thereto and capable of being driven in rotation about an axis which is off-centered relative to this housing, and a vane passing diametrally through the rotor in order to be rotationally interdependent therewith, and exhibiting two opposite edges bearing against the sidewall of the housing and separated from one another by a distance subjected to variations as the rotor rotates, this vane itself including elastic means capable of absorbing these variations.
BACKGROUND OF THE INVENTION
Rotary pumps are known and have been used for many decades for multiple applications, and a pump of the previously-defined type is described, for example, in Patent Document FR-2,256,683.
It is also well known to those skilled in the art that pumps of this type deliver an output which depends in particular on the eccentricity of the rotor relative to the stator, the output being greater the higher this eccentricity.
Nevertheless, the problem conventionally posed in the design of pumps with optimized output lies in the fact that the distance between the opposite edges of the vane exhibits variations which are themselves greater, the higher the eccentricity of the rotor relative to the stator, and that it becomes very difficult to compensate for these variations, particularly if the drive torque of the pump is to remain limited to a low value.
SUMMARY OF THE INVENTION
In this context, the object of the present invention is to provide a vacuum pump of the rotary type, in which these difficulties are overcome.
To this end, the pump of the invention, otherwise in accordance with the general description thereof which is given hereinabove, is essentially characterized in that the vane at least partially assumes the form of a thin sheet of a material offering elastic resistance to bending, and in that the elastic compensation means comprise at least one undulation of this thin sheet.
For preference, the rotor is hollow and exhibits two guide slots oriented diametrally and through which the vane passes, the undulation in the thin sheet being accommodated inside the rotor.
According to an advantageous embodiment of the invention, the opposite edges of the vane may consist of folds of the thin sheet on itself.
The pump of the invention is driven, for example, by rotating a drive shaft coaxially secured to the rotor, passing through an axial wall of the stator and exhibiting a drive relief accessible on the outside of the housing.
Other features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of a pump in accordance with the invention, the section being taken perpendicularly to the axis of rotation of the rotor; and
FIG. 2 is a sectional view on II--II of FIG. 1.
DETAILED DESCRIPTION OF THE DRAWINGS
The invention relates to a rotary pump which can be used as a pneumatic vacuum pump, essentially comprising a stator 1, a rotor 2, and a single vane 3.
The stator 1 is pierced with a housing 11 delimited by a cylindrical sidewall 110 and by two axial walls 111, 112, an inlet 12 for drawing in air and an outlet 13 for exhausting air emerging in the housing 11.
The rotor 2 is itself cylindrical, located inside the housing 11, and in tangential and sealed contact therewith, and secured to a coaxial driving piece 23 passing through the axial wall 111 of the stator and exhibiting a driving relief 24 accessible on the outside of the housing, so as to allow the rotor to be driven in rotation about an axis X which is off-centered relative to the housing 11.
Moreover, the rotor is guided on the outer edges 25 and 26 of its periphery by complementary bearings 15, 16 of the stator.
The vane 3 passes diametrally through the rotor in order to be rotationally interdependent therew
REFERENCES:
patent: 1421766 (1922-07-01), Edwards
patent: 1728620 (1929-09-01), Lateur
patent: 2077394 (1937-04-01), Buenger
patent: 2436876 (1948-03-01), Stamsvik
McCormick Jr. Leo H.
Robert Bosch Sistemi Frenanti Spa
Vrablik John J.
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