Laboratory centrifuge surge exclusion analysis

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The 1 condenser fouling: eliminate the heat transfer surface dirt and cleaning cooling tower.
Remove air 2 system: laboratory centrifuge using K11 refrigerant, common liquid temperatures above 28 DEG C, indicating there is air in the system. Cleaning method: start pumping gas recovery installation, the non condensable gas discharge, the general will R11 refrigerant pressure pumping to the saturation pressure is slightly lower than that of refrigeration Jing liquid temperature corresponding to the pressure, which corresponds to 28 DEG C below: 117.68KMP.
The onset of surge 3 after starting: stop the anti surge conditioning. When the laboratory centrifuge energy conditioning greatly reduced, the formation of inspiratory capacity deficiency, namely the steam cannot mean flows into the impeller, cause the exhaust pressure suddenly landed, compressor instability in the work area, while the onset of surge. In order to avoid the surge, can be a local steam after being compressed by the exhaust pipe, by-pass to the evaporator, which can not only anti surge. But for the laboratory centrifuge starts beneficial: reduce the vapor density and startup pressure, can reduce the starting power.
4 evaporation pressure too low: check the evaporation pressure is too low cause, add refrigerant refrigerant deficiency, refrigeration load is small, closed energy conditioning leaf.
5 when stop surge: stop laboratory centrifuge should pay attention to the main motor is reversed, and as far as possible on small guide vane angle, reduce laboratory centrifuge outlet pressure.
Laboratory centrifuge operation process, should adhere to the condensing and evaporating pressure stability, make the laboratory centrifugal refrigerating capacity is higher than the corresponding quantity of cold surge, with anti surge.