Rotary expansible chamber devices – Non-radially positioned sliding vane or abutment – Positively biased
Patent
1987-06-08
1988-09-20
Croyle, Carlton R.
Rotary expansible chamber devices
Non-radially positioned sliding vane or abutment
Positively biased
418266, F04C 200
Patent
active
047721928
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vane-type compressor of a construction having a rotor disposed for rotation inside a housing which exhibits an eccentric inner guide surface engageable with radially slideable vanes carried in grooves of the rotor. In the case of a known compressor of this construction according to DE-AS No. 21 17 102, the vanes are arranged exactly radially with respect to the axis of rotation of the rotor; the elastic rings are continuously in contact with the inner end faces of the vanes and press these against the circular-cylindrical interior surface of the housing cylinder, for which purpose only spring-elastic metallic rings are suitable; and a relativey large free space exists between the rings and the inside diameter of the ring grooves in the rotor. In this case, the elastic rings continuously act on the vane sliders so that their radial contact pressure is reinforced in addition to the centrifugal effect and their wear as well as that of the interior surface is increased. Lacking sufficient vibration damping, the metallic rings also promote the generating of noise caused by the radial and tangential whirring of the vanes.
It is an objective of the invention to further develop a vane-type compressor of the mentioned construction in such a way that it distinguishes itself by very quiet running.
The invention achieves this objective in a surprisingly simple and rationally implementable way by providing ring groove means in the rotor with at least elastically deformable ring means mounted therein for engaging the radially inner end of the vanes when they are at or near their inner dead center positions, the vanes extending at a small angle to the radius so that they serve to twistingly move the ring means inthe ring groove means when the compressor is operated. In preferred embodiments, two ring grooves with corresponding elastic rings are provided at respective opposite axial ends of the rotor. The rings that can be deformed in their cross-section, on the one hand, as elastic stops, dampen the movements of the vanes in the area of their inner dead center position, and, on the other hand, accelerate the initial phase of the radial upward movement of the vanes without causing any increased wear of the outer end faces of the vanes and of the inner surface of the housing cylinder by means of the effect of continuous additional radial force. Also the fatigue strength of the elastic rings themselves is ensured without any additional constructive expenditures by means of their adapted development and arrangement in the ring grooves since by their continuous twisting no excessive local strain occurs.
In the case of certain preferred embodiments, the rings are constructed as circular cross-section O-rings. The circular cross-section of the O-rings results in a particularly advantageous course of the damping and spring-back function by means of the increased deformability of the O-rings as compared to elastic rings having, for example, a rectangular cross-section.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a frontal view of the rotor of a vane-type compressor with the contour of the inner surface of a pertaining housing cylinder; and
FIG. 2 is a longitudinal sectional view according to the Line II--II of FIG. 1.
DETAILED DESCRIPTION OF THE DRAWINGS
A vane-type compressor 1, in a housing cylinder 2 with an elliptically cylindrical inner surface 3, contains a concentrically disposed rotor 4. The rotor 4 consists of an axle shaft 5 and a circular-cylindrical rotor body 6 having radial end faces 7. In the rotor body 6, vanes 9 are disposed in approximately radial slots 8 and are inclined by a few angular degrees from the radial direction in rotating direction, said vanes 9 supporting themselves to the outside against the inner surface 3 of the housing cylinder 2. In the end faces 7 of the
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patent: 3909158 (1975-09-01), Martin
Bayerische Motoren Werke Aktiengelleschaft
Croyle Carlton R.
Olds T.
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