Apparatus and methods for cooling and sealing rotary helical screw compressors

Patent · Wed Jan 01 00:00:00 EST 1997

OSTI ID:871081

Fresco, Anthony N ^[1]

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1. P.O. Box 734, Upton, NY 11973

In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor centerlines or alternatively the channel paths coincide with the helical path of the rotor edges.

• Research Organization: Associated Universities, Inc., Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016
• Assignee: Fresco, Anthony N. (P.O. Box 734, Upton, NY 11973)
• Patent Number(s): US 5653585
• OSTI ID: 871081
• Country of Publication: United States
• Language: English

Related Subjects

apparatus
methods
cooling
sealing
rotary
helical
screw
compressors
compression
incorporates
compressor
type
gas
refrigerant
liquid
oil
atomized
nozzles
suspended
parallel
suction
flow
alternatively
mounted
piping
aim
create
positively
homogeneous
mixture
droplets
maximize
effectiveness
improving
isothermal
volumetric
efficiencies
stream
degassed
discharge
pressure
heating
vessel
recovering
energy
added
outgoing
heat
incoming
stripped
typically
returned
preferred
rotors
contain
hollow
cavity
injected
channels
edges
forming
continuous
positive
seal
rotor
casing
alternative
method
direction
rotation
counter
tangential
centerlines
channel
paths
coincide
path
gas flow
pressure vessel
homogeneous mixture
compressor discharge
oil droplets
alternative method
oil stream
helical path
rotary helical
helical screw
screw compressor
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