Hanbell RC2-930A - 2.4 Design features

Technical Manual VERSION 2.0 -10-18-2018
8

 


2.4 Design features
HANBELL screw compressors feature simple and robust construction by elimination of some components such as
pistons, piston rings, valve plates, oil pumps which are found in reciprocating compressors. Without these components,
screw compressors run with low noise level, minimized vibration, high reliability and durability. HANBELL screw
compressors are of twoshaft rotary displacement design with the latest and advanced 5:6 patented screw rotors.
Screw rotors are precisely installed with roller bearings, i.e. radial bearings at both suction and discharge ends as well
as angular contact ball bearings i.e. axial bearings at discharge end. A threephase, twopole squirrelcage induction
motor drives the compressor. The motor rotor is located on the shaft of the male screw rotor. Cooling of the motor is
achieved with suction refrigerant vapor.
Compressor technical features:
Full product range RC2 series compressor consists of 26 models with displacement ranging from 98/118 m3/hr up to
1539/1847 m3/hr (50/60Hz) compatible for different refrigerants and applications.
Multinational patents of highefficiency screw rotors The new 5:6 high efficiency screw rotor profile is patented in
Taiwan, UK, US, and China. This new largevolume, highefficiency rotor profile is designed especially for modern
refrigerant characteristics. Highefficiency screw rotors are accomplished by using precision CNC machining centers,
rotor milling machines, rotor grinding machines. Strict ISO 9001 process controlling and the application of precise
inspection equipments, such as ZEISS 3D coordinate measuring machines, ensure highefficiency, highquality, low
noise and lowvibration HANBELL RC2 series screw compressors.
High efficiency motor Premium grade lowloss core steel with special motor cooling slot and refrigerant guide vane
which pilot the cold suction refrigerant gas through the motor provides the highest operating efficiency possible no
matter how strict operating conditions are.
Long life bearings and high reliability The screw compressors utilize a combination of 10 axial and radial bearings
and α axial balance piston to ensure longer bearing life and higher compressor reliability.
Doublewalled rotor housing Double casing structure with high strength inner ribs has been designed to minimize
noise and ensure rigidity. The rotor housing is made of highstrength gray cast iron FC25 that is extremely stable,
therefore no expansion will occur even at highpressure condition. These casings are machined by computer aided
machining centers and inspected by precision measuring machines to enhance reliability.
Direct flangeon oil separator A vessel made of ductile material FC 500 specially designed to withstand high
pressure and provide the highest efficiency of oil separation. Simple oil management, threestaged oil
separator(models above RC21020), lowpressuredrop demister to ensure the minimum refrigerant dilution in the oil
and maintain high oil viscosity.
Precise capacity control The slide valve for capacity control is located in the compressor chamber. The slide valve is
actuated by injection of pressurized oil into the cylinder from the oil sump as well as bypass of oil through solenoid
valves in each oil lines with pressure differential.
Perceptive protection modules RC2 series screw compressors are equipped with PTC thermistors and motor
protection module which could monitor discharge and motor coil temperatures as well as phase sequence and phase
loss. Accessories also include oil level switch to monitor the level of oil, pressure differential switch, and pressure relief
valve for optional application.
Adaptable with additional cooling Liquid injection connection port located at the motor casing and in the
compression chamber, oil cooler connection port, and middle pressure economizer connection port for customer’s
desired application.
RC2 series compressors not only continue RC series compressors’ characteristics of high efficiency & reliability design
mentioned above, but are also designed with the following newly added advantages to meet customers’ needs more
adequately:
1. Design the fittest highefficiency motor for respective refrigerant, operation condition and electrical power.
2. Dual capacity control of steps or continuous create more accurate and reliable mechanism (Option)
3. Part load effective economizer application.
Detailed description of new design features are given in the following chapters.