Common problems and solutions for vacuum freeze dryers "Personally tested and effective"

　　The following are some common problems and solutions for vacuum freeze dryers prepared by the editor of Ganzhou Dachang for everyone. You can read below:

　　1. Refrigeration system failure

　　The refrigeration system is the heart of the freeze-drying machine, and failure will affect the quality of the product. Common questions include:

　　1. High-pressure alarm: The water volume in the water condenser is insufficient or the water temperature is too high; scale deposition reduces the heat exchange efficiency; the low-pressure pipeline is broken and air enters the refrigeration pipeline; the valve is not fully opened or the exhaust is blocked.

　　2. The compressor current is too large: the lubricating oil is small or of inferior quality, and the cylinder is worn or damaged.

　　3. Oil pressure difference alarm: filter is clogged, lubricating oil viscosity is high or suction is too strong, etc.

　　2. Problems with automatic control systems

　　Failure of automatic control systems may affect the production process, such as:

　　1. Temperature control failure: sensor failure, controller setting error, heating element failure, etc.

　　2. Vacuum pump failure: mechanical parts are worn, pipelines are leaking, etc.

　　3. Vacuum system failure

　　Vacuum system failure may lead to poor drying results or reduced production efficiency, such as:

　　1. Unstable vacuum degree: pipeline leakage, reduced pump performance, high atmospheric humidity, etc.

　　2. Vacuum chamber leakage: damaged sealing ring, rough sealing surface, etc.

　　4. Poor material drying effect

　　If the material drying effect is not good, it may be due to the following reasons:

　　1. Improper setting of drying parameters: Drying temperature, vacuum degree, cold trap temperature and other parameters are not set properly and need to be adjusted to a range suitable for the material characteristics.

　　2. Material pretreatment is not in place: such as the water content is too high, the particle size distribution is unreasonable, etc.

　　3. Uneven heat distribution in the drying room: It may be due to rough surface of the heat transfer plate or improper placement of materials.

　　5. The machine operation noise is too loud

　　Excessive operating noise may be caused by the following reasons:

　　1. The bearings are severely worn and need to be replaced.

　　2. The lubricating oil has deteriorated and needs to be replaced with new lubricating oil.

　　3. The equipment installation is unstable and the equipment needs to be checked and fixed.

　　We will briefly introduce the common problems and solutions of vacuum freeze dryers that are "effective in personal testing" here. To sum up, when encountering problems during the use of vacuum freeze dryers, you should start from different systems to find the problem and take targeted measures to solve the problem. Hope the above content can be helpful to you!

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