For Internal Training
Compressor Mechanism (Inverter and Digital comp.)
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Mitsubishi Electric Inverter Compressor
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Low pressure shell type lubricates compulsorily with oil pump and it is also quick in starting.
Pressure difference system is mostly applied with high pressure shell type. It is simple in
structure by lubricating the shaft using the pressure differences of low pressure at the
bottom and high pressure at the scrolls. It is, however, poorly lubricated until the pressure inside the shell reaches the adequate amount. Moreover, if large capacity units are
not in work for a long time, the compressor may dry due to the refrigerant movement in
refrigerant circuit.
Volumetric efficiency(%)
98
High pressure shell type
96
Low pressure shell type (old)
94
Low pressure shell type (new)
Nowadays, as DC blushless motor has been
used for low pressure type compressor, the
suction overheat loss is improved, which
had been a big disadvantages to high pressure type.
As shown in graph 4, the efficiency today is
no less than the high pressure type's.
92
90
88
86
84
82
30
60
Operation frequency(Hz)
120
Measurement condition: condensation temperature 55ûC
and evaporation temperature 5ûC
Graph 4
Discharge gas
Dis. pipe
High pressured gas space
(discharged silencer)
Suction pipe
Suction gas
Fixed scroll
Orbit.scroll
Crank shaft
Refrigerant
Flow
Oil pump
Bearing
Low pressured
gas space
Refrigerant Flow
Motor (Rotor)
Shell
Motor (Stator)
The gas in low pressure shell compressor is
discharged to refrigerant circuit without attenuation. A silencer had to be attached beforehand with the compressor to reduce the
noise.
We Mitsubishi Electric developed this newly
designed compressor with the silencers inside the shell. This contributes to the reduction in production cost and enhancement of
reliability.
Bearing
Oil receiver
6
The Air Conditioning & Refrigeration Systems Works acquired ISO 9001 certification under Series
9000 of the International Standard Organization (ISO) based on a review of Quality management
for the production of refrigeration and air conditioning equipment.
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ISO Authorization System
The ISO 9000 series is a plant authorization system relating to quality management as stipulated
by the ISO. ISO 9001 certifies quality management based on the "design, development,
production, installation and auxiliary services" for products built at an authorized plant.
The Air Conditioning & Refrigeration Systems Works acquired environmental management
system standard ISO 14001 certification.
The ISO 14000 series is a set of standards applying to environmental protection set by the
International Standard Organization (ISO).
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