The invention discloses a low-temperature air high-speed centrifugal
machine and a control method. The low-temperature air high-speed centrifugal
machine comprises an
air filter, a sensor I, a
centrifugal compressor, a
heat exchanger, a sensor II, a centrifugal cavity, a sample disc, a control panel, a temperature
transmitter, a turbo expander, a water-cooling
heat exchanger, an electric valve and a silencer. Wherein the air outlet end of the
centrifugal compressor is divided into two branches through a flow dividing pipeline, the first
branch is communicated with the atmospheric environment through an electric valve and a silencer, the second
branch is in fluid communication with an air inlet of a
heat exchanger, an air outlet of the heat exchanger is communicated with an air inlet of a turbo expander, the turbo expander is coaxially and fixedly connected with a sample disc, and the sample disc is in fluid communication with the air inlet of the turbo expander. The whole sample disc is located in the centrifugal cavity,
airflow expanded and cooled by the turbo expander enters the centrifugal cavity, flows out from the other end after flowing through the internal space of the centrifugal cavity, enters the heat exchanger again for secondary heat exchange, and finally returns to an air inlet main path of the
centrifugal compressor to form a closed
airflow circulating
system. The
system collects multi-source signals such as temperature and rotating speed through a
PID controller in a control panel, closed-loop dynamic regulation and control are implemented based on parameters preset by a user, and finally precise control over the centrifugal working condition is achieved. According to the centrifugal
machine, the centrifugal machine can obtain a higher rotating speed and reach a lower temperature, the biological sample separation effect is improved, meanwhile, the biological sample is more effectively prevented from being denatured or inactivated due to temperature rise in the centrifugal process, and the sample inactivation rate is reduced to a large extent.