Rotary expansible chamber devices – Combined
Patent
1991-06-24
1992-06-09
Bertsch, Richard A.
Rotary expansible chamber devices
Combined
4182011, F04C 1816, F04C 2902
Patent
active
051202077
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a rotary screw compressor having a casing defining a working space, in which a pair of rotors is mounted with the rotor axes in a horizontal plane, said casing having an inlet channel and having means for injecting a liquid into said working space, said working space having an inlet port communicating with said inlet channel through an inlet chamber, the connection between said inlet channel and said inlet chamber being located below said horizontal plane.
Rotary screw compressors are well known and widely used for producing compressed air or in refrigeration systems, and their general structure and working principle therefore need not to be explained.
U.S. Pat. No. 4,762,469 discloses a compressor of the type specified above. A horizontally mounted compressor having the inlet channel coming from below offers in many cases advantageous solutions how to design the system in which the compressor forms a part. A compressor in a refrigeration or heat pump system can for example be mounted on the top of the evaporator with the downwardly directed inlet flange of the compressor directly connected to the upwardly directed outlet flange of the evaporator. U.S. Pat. No. 2,963,884 discloses a similar type of compressor, although intended for air compression and not being liquid-injected.
With a compressor so mounted, however, a certain problem can arise. If the compressor is of the type having means for injecting a liquid, e.g. oil into the working space for sealing, lubricating and cooling purposes, the oil by gravity might flow down into the inlet channel. If the inlet channel is connected to a lower located evaporator, the evaporator will be filled with oil and its efficiency negatively affected. In case the compressor is provided with a slide valve for regulating the capacity this problem will be considerably accentuated at part load, since with the recirculation of working fluid a large quantity of the oil will be returned to the inlet port.
The object of the present invention is to avoid that liquid injected into the compressor will flow back to the inlet channel.
According to the invention this has been attained in that said inlet chamber is provided with partition wall means collecting any liquid leading out from the working space through the inlet port and preventing it from reaching the inlet channel.
Advantageous embodiments of the invention are specified in the dependent claims.
The invention is explained more in detail by the following description of a preferred embodiment thereof and with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic side view of a compressor according to the invention.
FIG. 2 is a simplified vertical section through the inlet chamber of a compressor according to the invention take along line II--II of FIG. 3.
FIG. 3 is a vertical section taken along lie III--III of FIG. 2.
DETAILED DESCRIPTION
FIG. 1 shows a rotary screw compressor forming a part of a refrigeration system. The compressor comprises an inlet end section 10, an outlet end section 12 and a barrel section 14 extending therebetween. In the barrel section 14 a working space 16 is formed, in which a pair of screw rotors 18, 20 meshingly cooperate to form compression chambers. The axes 22, 24 of the rotors are located in a horizontal plane and define the axial direction of the compressor. The compressor has an inlet channel 26 connected to an evaporator 56. Gaseous working fluid is sucked from the evaporator 56 through the inlet channel 26 into an inlet chamber 28 contained in the inlet end section 10. Through an inlet port 46 the working fluid flows from the inlet chamber 28 into the working space 16 where it is compressed.
FIGS. 2 and 3 show the inlet end section 10 more in detail. The inlet end section 10 has an outer end wall 40, an inlet port plate 42 and a barrel wall 44, which limit the inlet chamber 28. The inlet chmber 28 is divided into two sections 30, 32 by two partition walls 34, 36. One of the par
REFERENCES:
patent: 2963884 (1960-12-01), Munck af Rosenschold
patent: 4452575 (1984-06-01), Schibbye et al.
patent: 4761123 (1988-08-01), Sowards
patent: 4762469 (1988-08-01), Tischer
Bertsch Richard A.
Cavanaugh David L.
Svenska Rotor Maskiner AB
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