The influencing factors of water inflow into the vacuum freeze dryer pump are analyzed.

During the actual use of vacuum freeze-drying machines, vacuum pumps sometimes occur, leading to frequent replacement of vacuum pump oil by customers. The relatively high cost affects the performance and service life of vacuum pumps, which in turn affects the normal production of customers.
There are two major impacts on vacuum pump water inflow: airflow issues, refrigeration, and vacuum issues, which mainly involve airflow direction, airflow channels, system refrigeration, related temperature, pressure, vacuum configuration, and control processes. These aspects do not independently affect vacuum pump water inflow, but should actually affect each other. To solve the problem of vacuum pump water inflow, it is necessary to comprehensively consider these factors. Below, we will conduct a detailed analysis of airflow issues.
The air flow problem affects the water inflow of the vacuum pump, which is mainly manifested in the uneven frost on the surface of the condenser (water catcher) coil, the different thickness of the single coil, and even the part of the coil is free of frost. The refrigeration capacity meets the requirements of full load use, and the coil temperature can be reached, that is, the coil temperature and vacuum are sufficient to meet the premise of full load of water vapor. The air flow distribution and the air flow direction do not pass through some coils, resulting in the inability to capture water vapor and enter the vacuum pump.
"When water vapor sublimates from the freeze-dried box to the condenser, it first passes between the intermediate valve and the intermediate passage, so the setting of the distance between the intermediate valve and the coil, as well as the setting of the distance between the airflow baffle and the coil and the intermediate valve in the condenser, will directly affect the organizational distribution and airflow direction when the airflow enters the condenser.". At the same time, the stroke of the hydraulically actuated intermediate valve is also one of the considerations. Freeze dryer Freeze dryer Freeze dryer
2. The layout of coils and the distribution of multiple groups of coils should be determined based on the direction of the air flow after passing through the isolation valve and air flow baffle, and in combination with the position of the vacuum tubes. In other words, the freeze-dried box serves as the source of water vapor generation, and the position of the vacuum tubes in the condenser serves as the source of vacuum pressure propulsion. Simulation analysis should be conducted based on these two starting and ending points to simulate the organizational distribution of the air flow from beginning to end, On the premise of satisfying the evaporation area and uniform distribution of refrigerant, that is, matching the cooling capacity of the system, matching the cooling distribution, including a larger ice capture capacity, and a larger sublimation speed of different products, a reasonable coil calculation and arrangement are conducted. The spatial layout of the coils, the number of coils, the length of a single group or piece (considering the evaporation path of Freon), and the surface area of the coils should be comprehensively calculated. In addition, additional airflow baffles can be added to effectively achieve uniform distribution of airflow. Figure 5 shows several typical coil layouts. Different coil layouts also determine the shape and size of the condenser, as well as the layout and size of the entire lyophilizer. The layout of the coil is crucial when considering the intake of water from the vacuum pump, and is also a point that involves a wide range of aspects. Therefore, comprehensive consideration must be taken during the design phase of the scheme phase.

The above content is organized by Superb heater Company, super heater. Mainly professional production: industrial heating elements, temperature measuring elements, production equipment, accessories, and raw materials such as tubular heaters, tubular heaters, belt heaters, ceramic heaters, silicone rubber heaters, thermocouples, etc.

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