Rotary expansible chamber devices – With changeable working chamber magnitude
Patent
1988-03-07
1989-12-05
Vrablik, John J.
Rotary expansible chamber devices
With changeable working chamber magnitude
418 77, 418166, 418195, 417356, F01C 306, F04C 300
Patent
active
048849570
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention refers to a displacement machine of a rotary pump type which includes a casing closed by an end plate and accommodating a rotor with displacement surfaces with which a seal is in form-locking engagement to co-rotate therewith. The displacement surfaces sealingly engage a hollow which defines the working space and is concentric to the rotational axis of the rotor whereby the hollow is provided in the rotor-facing end face of the casing. The end face defines with the rotational axis of the rotor an angle deviating from 90.degree. so that the cross sectional area of the hollow varies between a maximum value and a minimum value. The seal rotates on an inclined end face of the casing about an axis inclined about a small angle relative to the rotational axis of the rotor and intersecting this axis.
Such a displacement machine is known e.g. from the DE-PS No. 29 13 608 and may selectively run in both rotational directions as pump or as motor with any, even highly viscous and/or abrasive fluids. The rotor is provided with four vanes having parts projecting into the hollow to define the displacement surfaces. The vanes of the rotor engage through slots of the seal which is designed as disk so that this slotted sealing disk is moved with the rotation of the rotor. There is, however, a kinematic problem because the shaft of the rotor and the axis about which the disk-like seal rotates define a (small) angle so that the right angle between successive vanes of the rotor varies in dependence on the respective rotational position between a value below 90.degree. and a value above 90.degree. upon projection on the plane in which the seal rotates, that is upon projection on the inclined end face of the casing. (As it is known, only the angle of 180.degree. remains unchanged upon a oblique-angled projection). If the slots are made sufficiently broad in order to create space in view of positional variations of the vanes within these slots and caused for the above-stated reasons, the sealing action is impaired when the vanes and the disk-like seal are made of a rigid material. An elastic design of the vanes and/or the disk-like seal in circumferential direction limits, however, the range of application of this machine.
The invention is based on the object to create a displacement machine of the above-stated kind which maintains the same operating principle without encountering the above-stated problems and provides an even wider range of application for the machine.
This object is attained in accordance with the present invention in that the rotor is a displacement body filling out and covering the hollow with at least one recess according to a section along an axis parallel area intersecting the hollow wherein the surface parts of the displacement body projecting into the hollow define the displacement surfaces.
They are covered by the sealing edges of the seals. When referring to a recess, a displacement body of circular shape is to be understood from which a sector is cut out to obtain a respective displacement surface.
This solution has the advantage of a wide freedom of design with regard to the shape, position and number of displacement surfaces since to each recess one separate sealing element is assigned so that the sealing elements execute the slight shifting motions encountered during the course of a revolution independent of each other.
According to a preferred embodiment, several recesses are provided which are uniformly spaced about the circumference of the displacement body and result in a corresponding number of displacement surfaces leading to a very low pulsation of the machine.
In the simplest case, the displacement body--as viewed in top view--has the contour of a polygon with its axis parallel sides defining the displacement surfaces.
In the most common case, however, the area generating the recess is a surface of a body of revolution, preferably a cylindrical surface.
The axis of the body of revolution generating the recess in the displacement body may extend outside, in or insi
REFERENCES:
patent: 4548559 (1985-10-01), Willimczik
Feiereisen Henry M.
Vrablik John J.
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