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Zhengzhou Huachen Instrument Co., Ltd
Process principle of explosion-proof high and low temperature circulation device
Date: 2025-07-07Read: 7
The process principle of the explosion-proof high and low temperature circulation device is based on integrated temperature control, closed circulation system, and explosion-proof safety design, suitable for flammable and explosive environments. The core process is as follows:
1、 Temperature control principle
1. Refrigeration cycle
Compression stage: The compressor compresses low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gas, forming the basis for energy transfer.
Condensation stage: High temperature gas is cooled by air or water in the condenser to liquefy and release heat to the external environment.
Throttle stage: High pressure liquid refrigerant is depressurized and cooled by an expansion valve, and converted into low-temperature and low-pressure liquid.
Evaporation stage: Low temperature refrigerant absorbs heat from circulating media (such as silicone oil and ethylene glycol solution) in the evaporator and vaporizes, achieving medium cooling.
2. Heating cycle
Use explosion-proof electric heaters to directly heat the circulating medium, or use compressor waste heat to assist in temperature rise.
Accurately adjust the heating power through PID algorithm to ensure temperature stability (± 0.1 ℃).
2、 Heat exchange and circulation system
1. Medium circulation
The driving medium (water/oil/specialized fluid) of the high and low temperature resistant explosion-proof circulation pump flows in a closed pipeline to avoid oxidation and leakage.
The system is equipped with an expansion container that is independent of the circulation pipeline to accommodate the thermal expansion and contraction of the medium and maintain pressure balance.
2. Heat exchange design
Plate evaporator and condenser improve heat transfer efficiency and achieve rapid temperature rise and fall.
The design of the circulating air duct ensures temperature uniformity (≤± 2 ℃).
3、 Explosion proof safety design
1. Explosion proof structure
High strength explosion-proof shell (carbon steel/stainless steel) can withstand internal explosion pressure and prevent flame leakage.
The key components (compressor, motor, sensor) adopt explosion-proof certified models to eliminate the risk of electric sparks.
2. Active protection
Positive pressure explosion-proof system: Inject clean compressed air into the electrical chamber to block the intrusion of external combustible gases.
Multiple safety mechanisms: overload protection, pressure switch, automatic power-off due to overheating, and leakage monitoring.
4、 Application optimization features
1. Wide temperature range control: The typical range is -80 ℃ to+350 ℃, covering scenarios such as chemical reactions and material testing.
2. Programmed control: supports multi-stage temperature programming and adapts to complex processes (such as segmented temperature control in drug synthesis).
3. Low pollution operation: Fully enclosed circulation avoids medium contact with oxygen, reduces oil mist generation, and extends service life.
This device achieves precise temperature control while ensuring safety through the coordination of refrigeration/heating dual systems, closed medium circulation, and multi-level explosion-proof design, meeting the industrial needs in high-risk environments.
