5 or 8 kW refrigerating system and centrifugal compressor assemb

Refrigeration – Automatic control – Refrigeration producer

Patent

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Details

62505, 62510, F25B 110, F25B 3100

Patent

active

060704217

DESCRIPTION:

BRIEF SUMMARY
AREA OF TECHNOLOGY

The utility model pertains to heat and power engineering and can be used in refrigeration technology.


PRIOR ART

There is a known refrigerating system comprising a condenser, an evaporator, and a two-stage centrifugal compressor assembly with a built-in electrical motor between the stages. The motor is provided with a cooling system that has coolant feed and discharge ducts connected to the internal cavity of its housing. Further, the condenser inlet is connected to the compressor assembly outlet, and the condenser outlet is connected by one line to the evaporator inlet via the first choke element, and by a second line to the electrical motor cooling system via the second choke element. The evaporator outlet communicates with the compressor assembly inlet, and the gas coolant discharge duct is connected to the outlet of the compressor assembly's second stage (1).
The drawbacks of this known cooling system are low efficiency and reliability due to the fact that wet vapor can enter the exhaust of the compressor's first stage; the presence of oil in the system; the narrow range of controllability; and the fact that ecologically safe coolants cannot be used.
There is a known centrifugal compressor assembly for a refrigerating system comprising two centrifugal compressor stages with rotors, diffuser ducts, collection chambers, inlet and outlet tubing for the second stage, and a built-in electrical motor between the compressor assembly's first and second stages. The rotor of the electrical motor is positioned with the centrifugal stage rotors on one shaft, which is mounted on bearings, and the stator is fixed inside its housing, forming a cooling skirt between them. Further, the motor housing is provided with gas coolant feed and discharge ducts which are connected to the outlet tubing of the compressor assembly's second stage (1).
The drawbacks of this known centrifugal compressor assembly for a cooling system are low reliability due to the unsatisfactory design of the electrical motor's cooling system; the lack of total compensation for axial forces on the assembly's shaft; the large size of the electrical motor; and the fact that basic design solutions cannot be used for small assemblies, such as those with 5 and 8 kW cooling capacities.


SUMMARY OF THE INVENTION

For the refrigerating system, this utility model is intended to increase efficiency and reliability while ensuring ecological safety by allowing the use of ecologically safe coolants; it also broadens the range of cooling capacities and control.
For the centrifugal compressor assembly of said system, this utility model is intended to increase reliability, reduce dimensions and broaden the range of use.
The 5 or 8 kW refrigerating system in this claim comprises a condenser, an evaporator, and a two-stage centrifugal compressor assembly provided with a built-in electrical motor between the compressor stages. The motor has a cooling system with gas coolant feed and discharge ducts which are connected to the motor's internal cavity. Further, the condenser inlet is connected to the compressor assembly's outlet, and the condenser outlet is connected by one line to the evaporator inlet via the first choke element, and by a second line to the motor's cooling system via the second choke element. The evaporator outlet communicates with the compressor assembly's inlet, and the coolant discharge duct is connected to the outlet of the compressor's second stage. We propose fitting the system with an additional choke element, a separator vessel, and a recuperative heat exchanger, and providing the electrical motor's cooling system with a cooling skirt which is insulated from the internal cavity of the motor housing. The cavity of the cooling skirt is located between the stator and the motor housing and is connected to the second coolant feed and discharge ducts. Further, the additional choke element is a heat regulating valve controlled by the coolant pressure and temperature at its inlet, and the separator vessel is mounted in series in the

REFERENCES:
patent: 5211031 (1993-05-01), Murayama et al.
patent: 5253489 (1993-10-01), Yoshii
patent: 5655379 (1997-08-01), Jaster et al.

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