Rotary expansible chamber devices – With supply or exhaust passage in working member – Controlled by working member carried valve
Patent
1984-12-11
1986-12-09
Vrablik, John J.
Rotary expansible chamber devices
With supply or exhaust passage in working member
Controlled by working member carried valve
418186, 418 13, 251 57, F04C 1800, F04C 2300, F04C 2908, F16K 3112
Patent
active
046278028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION The present invention relates to a vane compressor
of the type comprising a rotor eccentrically arranged in a cylindric housing and vanes, which defines a space between the periphery of the rotor and the inner surface of the housing, the volume of said space varying during the rotation of the rotor.
PRIOR ART
A compressor of this type is disclosed in e.g. the French Patent specifications Nos. FR-A-826424 and FR-A-1,261,674.
Such a vane compressor has been used in many applications and operates well in most occasions. However, it cannot usually operate with different counter-pressures. If the counter-pressure exceeds the counter-pressure for which the compressor is designed, the compressor cannot operate. On the other hand if the compressor is designed for high counter-pressure and is connected to a low counter-pressure it will have a very low efficiency and will thus require quite a big power from the power source. Moreover, in the last-mentioned case, the compressor will vibrate excessively.
The object of the present invention is to provide a compressor of the type indicated above, which can efficiently operate at different counter-pressures.
SUMMARY OF THE INVENTION
According to the invention the rotor comprises at least one inlet valve adapted in the rotor between the inlet of the compressor and said space and adapted to open when the pressure in the space is below the pressure in the inlet in order to suck in air inside the space during the intake stroke of the rotor and at least one outlet valve adapted in the rotor between said space and the outlet of the compressor and adapted to open when the pressure in the space exceeds the counter-pressure at the outlet during the compression stroke. The inlet valve and the outlet valve are interconnected in such a way that the inlet valve at one side of the rotor is opened at the same time as the outlet valve at the diametrically opposite side of the rotor. Preferably the valves are interconnected by means of a hydraulic or pneumatic system.
By arranging the valves in the rotor body it is achieved that the construction is not dependent on a specific placement of an outlet valve in the housing but the opening of the valves can take place at any angular position of the rotor. In spite of the arrangement in the rotor, the valves are pressure controlled. This is made possible by the interconnection of pairs of inlet valves and outlet valves by a preferably hydraulic system, which interconnects the valves and thus balance the centrifugal forces exerted on the valves.
In a further aspect of the invention, the rotor is divided in several sectors which are clamped between cylindrical plates so that a cross-shaped space is defined between the sectors, which space receives the vanes. The compressor may comprise several compressor units interconnected in series to obtain a required output pressure.
SHORT DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partially broken side view of the compressor according to a preferred embodiment of the invention.
FIG. 2 is a cross-sectional view taken along the line II--II in FIG. 1. FIGS. 3a and 3b are longitudinal sectional views of a relief system for the compressor according to FIGS. 1 and 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The compressor according to the preferred embodiment of the invention is shown in FIGS. 1 and 2. The compressor unit 10 comprises an air inlet 12, which opens to the inner space of an essentially cylindrically shaped rotor 14. The rotor 14 is eccentrically journalled in a cylindrical housing 15, compare also FIG. 2.
The rotor 14 consists of a cylindrical body having eight axial apertures 16 and 17, in which four apertures 16 open to the left (seen according to FIG. 1) in the body and four apertures 17 open to the right in the body, whereby each pair of apertures 16 and 17 are separated in the axial direction by a plate 21. Each aperture 16 and 17 is radially connected to the periphery of the rotor body 14 through valve seats 19 and 20 as is shown in FIG. 1. A valve body 23 co-o
REFERENCES:
patent: 819674 (1906-05-01), Rochow
patent: 1729951 (1929-10-01), Lower
patent: 2353965 (1944-07-01), Meador
patent: 3406634 (1968-10-01), Ounsted
patent: 3994641 (1976-11-01), Southard
Draaisma Rudolph
Reichmann Werner
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