Pumps – Motor driven – Fluid motor
Patent
1991-03-12
1993-03-09
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
F04B 1700
Patent
active
051921995
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a machine of the rotary screw type for a gaseous medium having a compression section and an expansion section driving the compression section.
In a compressor a gaseous medium is compressed to a higher pressure which consumes power. In an expander a gaseous medium is expanded which generates power. It is thus possible to drive a compressor by use of an expander. An example of this is disclosed in DE-PS 1 811 284 showing a rotary screw compressor driven by a rotary screw expander. A similar example is disclosed in an article in the magazine "Gluckauf" 9/1960, pages 576 and 577.
According to known technique in this field, as exemplified by the above cited references, the compressor and the expander are made as separate units, each one having its own separate working space with inlet and outlet ports and being connected only by the common driving shafts. Such a construction of an expander-driven compressor therefore will be relatively complicated.
The object of the present invention is to make an expander-driven compressor, which is more simple in its construction than known machines in this field.
This object is according to the invention attained in that a machine of the introductionally defined kind has the features specified in the characterizing portion of claim 1 of the present application.
A machine according to the invention has the advantages of being very compact and simple in its construction and requiring a minimum of ports for the supply and discharge of the working medium since a common intermediate pressure port can be used for both the medium being compressed and the medium being expanded. It is therefore particularly suitable to be used where low weight and small dimensions are aspired, e.g. in applications in aeroplans.
The invention will be further explained by the following detailed description of preferred embodiments of the invention and with reference to the accompanying drawings.
FIG. 1 is a side view of a machine according to a first embodiment of the invention.
FIG. 2 is an enlarged section along line II--II in FIG. 1.
FIG. 3 is a simplified side view of the male rotor of the machine in FIG. 1.
FIG. 4 is a diagram illustrating the working process of the machine in FIGS. 1 to 3.
FIG. 5 is a top view of a machine according to a second embodiment of the invention, the upper half of the casing being removed.
FIGS. 6 and 7 are sections taken along lines VI--VI and VII--VII, respectively, of FIG. 5.
FIG. 8 is a simplified side view of the male rotor of the machine in FIG. 5.
FIG. 9 is a diagram illustrating the working process of the machine in FIGS. 5 to 8.
FIGS. 10 and 11 are simplified side views of the male rotor in machines according to further embodiments of the invention.
FIGS. 12 and 13 are diagrams illustrating the working process of the machines in FIGS. 10 and 11, respectively.
FIG. 1 is a side view of a machine according to a first embodiment of the invention. The casing, composed of two end walls 4 and 6 and a barrel wall 2 extending therebetween, defines a working space in which two rotors cooperate. Outside the end walls 4 and 6, there are bearing housings 26 and 28. The machine has a first inlet channel 8 for pressurized air, a second inlet channel 10 for vacuum and a common outlet channel 12 leading to atmospheric pressure.
As can be seen in FIG. 2 the working space formed by the casing has the shape of two intersecting cylinders and contains a male rotor 14 and a female rotor 16. The male rotor 14 has four helically extending lobes 18 and intermediate grooves 22 and the female rotor 16 has six lobes 20 and intermediate grooves 24. The rotors intermesh through the lobes 18, 20 and grooves 24, 22 forming working chambers between the rotors and the walls 2, 4, 6 of the casing. The working chambers travel axially along the machine as the rotors rotate, thereby changing their volumes. The volume of each working chamber starts from zero at one end of the machine and rises continuously up to a maximum, from which it then decreases down to zero ag
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Herbert Ossenbuhl, "Versuche mit einem neuartigen Blasluftumformer auf der Zeche Osterfeld", Gluckauf, Sep. 1960, pp. 576-577.
Bertsch Richard A.
Svenska Rotor Maskiner AB
Thorpe Timothy S.
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