Welcome to visit SONYAN Freeze Dryer Manufacturer official website!
E-mail: service@bjsyhx.com.cn
Product List
Breaking News
SY Freeze Dryer participated in the 62nd CIPM
With its high-quality and attractive appearance, SY Freerze Dryer's products have attracted the attention of numerous exhibitors and professional customers, with continuous consultation and communication....
What are the advantages of a laboratory freeze dryer used in a laboratory over conventional methods?
The laboratory freeze dryer uses the physical principle to freeze the moisture in the compressed air to below the dew point, so that it can be precipitated from the air....
Analysis on the drying principle of freeze dryer
I believe everyone is familiar with freeze dryers. Such a machine that integrates freezing and drying has been favored by most experiments. The principle of freeze drying of freeze dryers is actually not complicated. Freezing and drying are divided into two processes. ...
How to properly maintain an industrial vacuum freeze dryer?
Industrial vacuum freeze dryer is composed of refrigeration system, vacuum system, heating system, electrical instrument control system. ...
What is the control system of industrial vacuum freeze dryer?
The control system of industrial vacuum freeze dryer is the command mechanism of the whole machine....
Contact Us
SONYAN Freeze Dryer Manufacturer
Service Line:+86-13161061539
SONYAN Freeze Dryer:+86-13161061539
Address:C706 Changyin Building, NO.88 Yongding Road, Haidian District, Beijing, China
Email:service@bjsyhx.com.cn
Facebook:SYHXfreezedryer
Your Location: Home >> Application >> User case >> Solution to the temperature adjustment problem of freeze dryer

Solution to the temperature adjustment problem of freeze dryer

Release Date: Thursday 10 . 2019
Browse: 873

Solution to the temperature adjustment problem of freeze dryer
During the freeze-drying process of the freeze dryer, the temperature pre-freezing of the liquid articles and the subsequent sublimation of the moisture in the solid matter need to control the temperature within a certain range of the process requirements, which requires the freeze dryer to have a certain precision of temperature regulation. Features. How to better solve the temperature regulation problem of the freeze dryer without setting the temperature control unit, the specific scheme is as follows:
1. In the premise of the refrigeration capacity of the refrigeration compressor, a refrigeration branch that can provide appropriate cooling capacity is provided next to the refrigeration system piping for cooling the front of the freeze dryer to meet the cooling demand during temperature adjustment;
2. At the same time, due to the temperature adjustment, the refrigeration compressor is supplying cooling to two evaporators with different evaporation temperatures. The difference in working conditions may cause a large impact on the refrigeration compressor due to the hysteresis of the expansion valve control. In severe cases, It will cause the liquid pressure of the refrigeration compressor to cause a failure, which requires a good grasp of the control of the return steam pressure. The technicians now add an electromagnetic valve to the steam return line of the front tank evaporator, and the electromagnetic valve is passed through the pressure controller. The monitoring of the differential pressure before and after to control the opening or closing of the valve reduces the load shock during the temperature adjustment to ensure the smooth operation of the compressor;
3. In order to prevent the pressure in the front tank evaporator from rising due to the closing of the electromagnetic valve, the temperature adjustment effect is not guaranteed, and the technician adds a steam return pipe to the steam return line in front of the electromagnetic valve, and is connected to The two-stage compressed suction pipe of the refrigeration compressor proves that this treatment scheme is feasible through the practice on multiple freeze dryers. It can avoid the increase of the cost of adding the temperature control unit and solve the present problem. The commonly used capillary temperature regulation results in an unsatisfactory temperature regulation effect and a load shock to the compressor.
 

share to:
Songyuan Freeze Dryer logo
Address:C706 Changyin Building, NO.88 Yongding Road, Haidian District, Beijing, China
Hotline:+86-13161061539
Email:service@bjsyhx.com.cn Facebook:SYHXfreezedryer
Fax:+86-10-58895379