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Refrigeration Screw Compressors and Chilling Units
CSI compressors are
state of art new generation Twin Screw Oil Injected Screw Compressors
with open drive. They have few moving parts, high operating
efficiency, can handle occasional liquid slugging without any
damage. Low maintenance & long operational life is the result
of these characteristics. Capacity control is Stepless 10% through
100% to enable infinite control to match the load.
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Design Features : Compression is obtained
by two inter-meshing rotors of asymmetric profile (male rotor has
4 lobes and female rotor has 6 lobes) housed in a casing. Gas is
drawn through inlet port and is trapped in the space between adjacent
lobes. Further rotation of rotors reduces the space in the lobes
and compression takes place.
Compressor : Open drive positive displacement
oil injected, twin Rotary suitable for low evaporating temperature
up to minus 50 degree centigrade.
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Economizing
:These compressors also have a side port for
Economizer or subcooling Circuits Used for low and
ultra-low temperature applications. This option allows
for increased capacity with a small increase in power
input at these temperatures |
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Lubricating
System
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Oil
separation system-Efficient multi stage coalescing system is
separate from the compressor. Servicable without removing compressor,
chiller or condenser. The oil carry over is maximum 5 p.p.m.
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Integral built in oil heater maintains oil temperature for start
up
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Rotary oil pumps ensures positive lubrication to bearings for start
up
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Casting : Made from graded gray iron,
stress relieved and machined on CNC’s.
Rotors : machined from High tensile
carbon steel, on imported rotor cutting machines, dynamically balanced.
Bearings : Generously oversized cylindrical
roller bearings on the suction end for radial loads and double row
taper roller bearings on discharge end for radial and axial thrust.
Shaft Seal : Mechanical, balanced,
face type with Rotatin Carbon Steel, Oil Lubricated. The shaft seal
is replaceable without removing the compressor or Motor.
Capacity Control : A built in
slide below the rotors provides stepless capacity control
down to 10% of full load capacity which results in considerable
saving on power. The slides moves to and fro by an inbuilt
hydraulic cylinder. Automatic control adjust the position
of the slide to reduce/increase the capacity of the compressor
to match with the varying requirements.
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Choice of Refrigerant : Flexibility
in meeting environmental requirements, R22/R717 are the most
commonly used refrigerants
Compressor / Motor drive couplings
: Spacer type two piece flexible coupling with metallic
elements allows for in place replacement of coupling &
compressor seal.
Drive Motor : SPDP or TEFC 3
phase 50 cycles 415 volts class `F’ insulation foot mounted
as per IS-325
Controls : Electro-Mechanical
or Microprocessor
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Ability
to handle liquid :An important feature of screw
compressor is the ability to handle volumes of liquid
without any damage to machine, matched neither by
the reciprocating nor by centrifugal compressors
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CSI 120 Screw Compressor Unit with oil separation
& cooling system
Piping
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Oversized suction & discharge stop & check
valves.
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Suction strainer-60-mesh-ensures low pressure drop
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Take – apart Thermal Expansion Valves, Solenoid
valves
& liquid line filter/Driers allow ease of maintenance.
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All piping as per ASME B 31.5, Pressure tested, evacuated
& charged with refrigerant
Evaporator & Condensor
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For R22 – Shell & tube type with removable
heads allow total maintenance.
ASME Section VIII Div.1 Construction. Tubes are Roll
expanded in to tubesheets.
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Condensor : ¾” OD Tubes are cleanable
and removable, Integral fin design maximizes condensing
performance.
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Evaporator : ½” to ¾” tubes
are used with turbulators for high efficiency. Choice
of Shell, baffle, tubes, turbulators & headers material
available to customer preference & design requirements.
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For R 717 – The condensor and evaporators can
be supplied as per customer requirements.
Typical Applications
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Air conditioning, Heat pumps, Bulk drug plants, Pharmaceuticals
and Chemicals, Petrochemicals and Fertilizers, Cold
Storage, Ice Rinks, Cooling Plants, Water Chilling,
Refrigeration Plants for Food Freezing, Marine Refrigeration,
Milk Dairies.
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