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Main page > Products >
Compressors compressor sets > Refrigeration compressor units
Refrigeration compressor units - type ASR
refrigeration compressor units type ASR
CONSTRUCTION
The compressor package consists of the following main assemblies and functional systems:
- screw compressor with two rotors of assymetric profile
- electric squirrel-cage motor
- flexible metal coupling
- horizontal oil separator, which also forms a supporting structure of the package and an oil tank
- hydraulic system of lubricating, controlling, cooling etc.,
- electric system of controlling and protecting
- system of oil cooling, as per an individual selection
- system of stepless capacity regulation within the range of 11-100 %
- check-measure and protecting equipment
- stop - check valve at the suction and discharge side of the compressor
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The compressor package composes a block unit, functionally adapted to operation in
automated refrigerating systems or manually operated ones. Construction of the package
is compact and it does not require special foundations or anchor bolts. The shock
absorbers, which are delivered together with the package, give high efficiency of damping
the vibrations transmitted to the base. When selecting the foundation it is necessary to
take into account static loads.
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1 - Gas suction filter
2 - Stop and check valve
3 - Compressor
4 - Oil separator
5 - Coupling
6 - Electric motor
7 - Check valve
8- Stop valve
9 - Filter
10 - Oil pump
11 - Oil overflow valve
12 - Oil cooler, thermosiphon or water one
13 - Injection system
Note: Items 12 and 13 are not applied together, but only as options.
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CONTROL AND DRIVE
The compressor package realises quite automatically, in a programmed cycle, all the start up activities as well as activities related to disengaging the package (including an emergency shutdown).
Operation of the package, including capacity regulation, can be run automatically or manually.
All the ASR screw compressor packages are equipped with the microprocessor control system.
Control systems of the package ensure automatic capacity regulation of the compressor depending
on assigned working parameters. The current level of capacity is indicated directly on the
compressor and on the control panel of the control cubicle. The microprocessor control system
can regulate compressor capacity in a function of temperature or evaporating pressure, depending
on a kind of an applied sensor.
The screw compressor is driven by an electric squirrel-cage motor of power selected in accordance
with requirements at specified working parameters (to, tm, tk); it s than 50 to 1100kW and supply
voltage: 3/400V, 50Hz or another.
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ECONOMISER
In order to increase refrigerating capacity and to improve efficiency of the refrigerating system, in which screw compressors operate, it is possible to apply the economiser system.
All the ASR compressor packages are adapted to operate in the economiser system.
Refrigerating capacity of the ASR packages operating in the economiser system:
Qe= Ye x Qo
where:
Qo - refrigerating capacity as per the table
Ye - refrigerating capacity coefficient of the economiser from the diagram
Refrigerating capacity and power requirement:
Ne= Ne(from the table) x k
Qo= Qo(from the table) x k
noting for:
ASR163A - k = 0,512
ASR204A - k = 1,000
ASR255A - k = 1,953
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MAIN TECHNICAL DATA OF COMPRESSORS
Specification
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Unit of measure
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Compressor
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SR163
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SR204
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SR255
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Diameter of rotors
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mm
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163
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204
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255
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Ratio of rotor length to diameter
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-
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1,65
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Theoretical volume capacity
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m3/h
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610
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1200
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2340
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Rotations
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1/min
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2950
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Built-in volume ratio
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-
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2,6-3,5-4,8 as per requirements
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Capacity regulation
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%
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11÷100%
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Weight
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kg
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750
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1000
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1500
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Main dimensions of compressor package
See dimensions
How to order
In an order it is necessary to specify the type of a selected package as per the code, shown below:
ADDITIONAL EQUIPMENT - on application
- electric cubicle for starting up motors
- economiser
- thermosiphon tank
BROCHURE
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