Rotary expansible chamber devices – With mechanical sealing
Patent
1989-06-30
1990-11-06
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
418196, F01C 128, F01C 1900
Patent
active
049682342
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotary piston machine with sealing elements. In the case of the rotary piston machine with sealing elements of this kind previously known from U.S. Pat. No. 3,809,026, the rotors are elliptical in cross-section and the sealing elements are constructed of round sealing bars, which are mutually linked by the connecting piece. Due to this design, generally only one or two sealing bars of a sealing element are in contact with the rotor's convex surfaces, the other sealing bar is free and protrudes without contact; this is illustrated in FIG. 8 of the patent text quoted. The sealing elements are thus not guided, and must be brought into the sealing position by auxiliary means, for example by the inner pressure.
This is where the invention steps in. It has as its objective the improvement of the sealing system of a specific rotary piston machine which has an inner working space limited only by at least three rotary pistons.
On this basis the invention proposes for the solution of this objective that the front faces of the rotary pistons are limited by several arcs, which have two different radii R, r, of which the arc pieces with the same radius R or r each have arc lengths equal to one another, which are alternately placed in contact at connection points and tangentially blend into one another at these points,
which are torsionally stiffly connected with the shafts respectively allocated to them, which shafts are rotatively mounted in the housing, extend along their geometric central axis, and are rotationally synchronized with each other by means of a gear, with which they are rotatable in the same direction of turn,
which have front faces arranged flush with one another, and
which limit laterally an inner working space by means of their curved peripheral surfaces, the sum (R+r) of the two different radii R, r by the dimension of a gap S between the adjacent rotary pistons, and the sealing bars each have the profile section of an isosceles, blunted triangle, whereby the corners of the triangle point towards each other, the bases extend parallel to one other and the relationship ##EQU1## applies for the angle phi between the connecting line of the opposing blunted corners of the isosceles triangle and its sides, whereby K is the distance between the respective parallel sides projected onto a line parallel to the bases, and K can be positive, negative or zero.
Such sealing elements are of simple design and are thus also simple to manufacture; they are axially insertable into the gap between two adjacent rotary pistons and in this way are easily mounted. Due to this they can also be easily replaced, by removing a front panel from the housing.
The sealing elements are not fixedly secured to the rotary pistons, which they seal off from one another, rather, they are kept in place by the fact that the one sealing bar is located on the one side of the gap, the other on the other side of the gap, both being identically designed sealing bars, however, having such large cross-section dimensions that they are unable to be moved through the gap. Due to the connecting piece connecting them, they are also unable to move away from each other. They are therefore generally inserted or removed axially between two adjacent rotary pistons. In a preferred embodiment of the invention it is provided that the connection piece be arranged to be detachable on at least one side from the sealing bar located there. For this purpose, the one sealing bar can be connected with the connecting piece, for example, by means of a screw connection, by means of hooks, a clip connection or suchlike. Such detachable sealing elements are favourable for special mounting and dismantling purposes.
The gap between two adjacent rotary pistons is limited by the arcs with their differing radii, from which the rotary pistons are generated. Depending on the relative position of two adjacent rotary pistons to one another, the gap is limited by an arc with a large radius R on the one side and an arc with a smaller radius r on the other
REFERENCES:
patent: 2097881 (1937-11-01), Hopkins
patent: 3809026 (1974-05-01), Snyder
patent: 4324537 (1982-05-01), Meyman
Cavanaugh David L.
Vrablik John J.
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