Freeze-drying process is a heat and mass transfer process involving refrigeration, vacuum, electronics, chemistry, cryogenic medicine and other disciplines.In the pharmaceutical industry, vacuum freeze drying machine play an important role, can reduce the possibility of the material being the oxidation, eliminate bacterium material, ensure that the original shape can get very good material, at the same time further reduce pollution risks, at present is suitable for active pharmaceutical ingredients, Chinese medicine yinpian, biological, pharmaceutical intermediates, such as drying of materials.In recent years, with the continuous development of China's pharmaceutical industry, the vacuum freeze-dryer manufacturers have been continuously strengthening technological innovation, promoting the equipment to make greater breakthroughs and better use in the pharmaceutical drying industry.
It is well known that in the process of vacuum freeze dryer, if there is a fault, it is easy to affect the process of work.However, it is inevitable that users will encounter some minor faults in the process of using the equipment, so they need to know the causes of the faults and the corresponding solutions, so as to make timely judgment and eliminate the faults.In this regard, some vacuum freeze-drying machine manufacturers listed several common failures, and analyzed the causes and solutions, only for the industry reference.
Common fault 1: unstable supply voltage
It is understood that the normal operating power supply voltage of the vacuum freeze dryer is 215-225 volts. After deviating from the allowable voltage range, the compressor cannot work effectively or even operate at all.
In the case of unstable power supply voltage, the solution is to replace the qualified power supply when the supply voltage is unqualified;When the supply voltage is not stable, the AVR(220V) can be used or the original operating power on the voltage regulator.
Common fault two: indoor temperature is higher than 30℃
The vacuum freeze-dryer needs to operate in a suitable environment. When the indoor temperature is higher than 30℃, the condenser may fail to condense, resulting in system failure.
The maintenance method at this time is that if the indoor temperature is around 28℃, the user can open the condenser back door or open the door of the room, thus optimizing the ventilation and cooling conditions.
Common fault three: indoor temperature below 0℃
Too high indoor temperature is not acceptable, too low is not appropriate.If the indoor temperature is lower than 9℃, the compressor oil will become thick, easy to affect the normal operation of the compressor.In addition, when the temperature is too low, all the electronic components may be affected and misoperate.
In view of this situation, the maintenance method suggested by the technician is that when the ambient temperature is lower than 0℃, other heating equipment can be used to raise the ambient temperature, and keep the temperature above 5℃, below 30℃.
Common fault four: excessive dust in freeze-drying machine or environment
It is understood that if there is too much dust on the condenser and compressor, it is easy to make the condenser can not achieve the condensation effect, directly affect the use of the compressor.
Accordingly, the job that removes dust regularly is indispensable.If there is too much dust in the environment, it is recommended that users remove the dust that covers the compressor and condenser on a monthly basis.To protect the equipment from damage, dust on the compressor, condenser, and pipe can be removed with a soft brush.
Common fault five: the humidity in the environment is too high
When the humidity in the environment is high, it is easy to cause electrical failure or short circuit.In view of this situation, the maintenance method is to use ventilation equipment or open a window for ventilation, thereby reducing the humidity.