Frequency conversion magnetic levitation compression expansion engine set

Abstract

A variable frequency magnetic suspension compressional expansion assembly comprises a compressor, an evaporator and an expansion machine that are connected. A magnetic suspension bearing centrifugal compressor is directly connected with a radial flow type expansion machine via a shaft, the shaft is suspended on a left radial magnetic suspension bearing, a right radial magnetic suspension bearing and an axial magnetic suspension bearing, a variable frequency motor is provided between the left radial magnetic suspension bearing and the right radial magnetic suspension bearing and used for driving the centrifugal compressor; and the radial flow type expansion machine comprises an air inlet chamber and an air outlet pipe, nozzles and impellers are provided between the air inlet chamber and air outlet pipe and passed through the air inlet chamber and air outlet pipe, and the impellers are fixedly connected on the shaft. The power from expansion is transmitted to the compressor, and the refrigerant after expansion is entered into the evaporator to carry out evaporative cooling; after being evaporated in the evaporator, the refrigerant is sucked by the compressor to carry out circulatory flow; and the magnetic suspension bearings assure that the shaft does not contact with the bearings when the assembly operates, so that lubrication via lubricating oil is not needed.

Description

technical field [0001] The invention relates to a central air-conditioning refrigeration device, in particular to a frequency conversion magnetic levitation compression expansion unit. Background technique [0002] In the refrigeration and air-conditioning industry, saving energy is the primary issue to measure the advanced nature of products. The country has a series of measures for energy saving. In public buildings, the electric energy consumed by air conditioners accounts for more than 30% of the total electric energy. It is of great significance to save the electric energy of air conditioners. [0003] The traditional air-conditioning and refrigeration system is composed of compressor, condenser, throttling mechanism and evaporator. The refrigerant flowing through the throttling mechanism is an isenthalpic process. This process only changes the pressure and temperature parameters of the refrigerant, and cannot obtain expansion. achievement. [0004] Due to the high ro...

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Problems solved by technology

[0003] The traditional air-conditioning and refrigeration system is composed of compressor, condenser, throttling mechanism and evaporator. The refrigerant flowing through the throttling mechanism is an isenthalpic process. This process only changes the pressure and temperature parameters of the refrigerant, and cannot obtain expansion. achievement

[0004] Due to the high rotation speed of the centrifugal compressor, lubricating oil is required between the drive shaft and the bearing of the conventional compressor to reduce friction and wear, and at the same time take away the heat of friction. A complex lubrication system is required. This structure The structure of the air conditioning unit is complicated, the energy consumption is large, the maintenance is troublesome, and the cost is high

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