Rotary expansible chamber devices – With mechanical sealing – Seal element between vane and cylinder
Patent
1984-10-17
1986-07-08
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
Seal element between vane and cylinder
418260, 418268, F01C 100, F01C 1900
Patent
active
045990573
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotary blade machine, for example, a blades pump mainly comprising a rotor having outwardly opening axial slots and blades each slidably arranged in each slot and a stator surrounding the rotor with the blades and having inlet and outlet ports.
The invention has for its object to improve the seal across the moving blades in a rotary blade machine of the kind set forth in the preamble. In the successive compartments between two blades different pressures will prevail so that leakage will occur along the blades, in particular along the sides thereof.
The rotary blade machine embodying the invention is distinguished in that in an axial sense the blades project at both ends beyond the rotor into a chamber formed by a re-entrant sidewall part of the stator, said chamber accomodating a shut-off body associated with each blade.
By this shut-off body any leakage along the side and top edges of the blades is avoided since this shut-off body closes the gap between each blade and the stator.
In one embodiment the shut-off body is constructed in the form of a filling body comprising eight wear-resistant blocks interconnected by a flexible intermediate layer. The flexible intermediate layer serves as a spring element to urge the blocks against the slot.
One of the additional advantages of the filling bodies in this embodiment is that the blades furthest slipped out of the rotor remain in the desired position, that is to say, they will not tilt.
This is furthered by urging the inwardly slipped blades against one side of the unavoidably larger slot in the rotor, which can be performed in accordance with the invention by providing relief grooves at each blade at least on the low-pressure side.
According to a further embodiment the shut-off body grips around the side edge of the blade, whilst the bodies are resiliently interconnected so that a single ring is obtained, which simplifies mounting and manufacture.
According to a further aspect the shut-off body is connected with a strip extending at the side of the blade.
In order to facilitate mounting of the rotor with the blades in the stator, the wall of the chamber in the stator facing the rotational centre as well as the edge of the projecting blade end have a locating rim so that in addition the leakage gap is reduced.
In order to minimize drop of pressure across the blades a great number of blades are distributed in known manner along the circumference of the rotor. This means that a large number of grooves have to be made in the rotor, which involves problems in the manufacture of solid rotor bodies.
In order to eliminate this drawback the invention proposes to build up the rotor body by means of plates, each plate being punched in the desired shape with slots in a star-shaped array from a basic plate. By providing slots of relatively different widths in the plates the relief grooves can be formed in the rotor.
In order to ensure small tolerances of the stator dimensions the stator embodying the invention is formed by an outer ring having inlet and outlet ports and two bearing plates comprising the chamber. Moreover the materials of the various component parts can now be appropriately chosen. These stator parts are enclosed in a housing.
Such a construction is particularly suitable for establishing a communication between two diametrically opposite inlet and outlet channels respectively in the stator ring by means of two distribution channels arranged in the housing so that a uniform load on the rotary shaft of the machine is ensured. This implies that the filling bodies between the blades have a long lifetime owing to the minor deformations.
The invention will be described more fully with reference to an embodiment.
The drawing shows in
FIG. 1 an axial longitudinal sectional view of the machine embodying the invention,
FIG. 2 a sectional view taken on the line II--II in FIG. 1,
FIG. 3 a perspective view of part of the rotor in which blades are arranged and of part of the stator,
FIG. 4 a cross-sectional view of a blade arranged in a slot of
REFERENCES:
patent: 134123 (1872-12-01), Bennett
patent: 990163 (1911-04-01), Von Pittler
patent: 3102494 (1963-09-01), Adams
patent: 3567347 (1971-03-01), Scott
Snyder John P.
Van Mullekom Innovation B.V.
Vrablik John J.
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