Air-cooled screw freezer

The air-cooled screw refrigeration unit is composed of a compressor that sucks in low-temperature and low-pressure refrigerant gas that has been evaporated and cooled, and then compresses it into high-temperature and high-pressure gas that is sent to the condenser;

2. After being cooled by a condenser, high-pressure and high-temperature gas condenses into a liquid at room temperature and high pressure;

3. When the liquid at room temperature and high pressure flows into the thermal expansion valve, it is throttled into low-temperature and low-pressure wet vapor, which flows into the shell and tube evaporator, absorbs the heat of the chilled water in the evaporator, and lowers the water temperature;

4. After evaporation, the refrigerant is sucked back into the compressor and the next refrigeration cycle is repeated to achieve the refrigeration purpose.

Air-cooled screw freezerThe refrigeration compressor has a pair of helical teeth that mesh with each other and rotate in opposite directions. The rotor with protruding teeth is called a male rotor, and the rotor with concave teeth is called a female rotor. The teeth of the rotor are equivalent to the piston, and the working volume formed by the teeth of the rotor, the inner wall surface of the body, and the end caps at both ends is equivalent to the cylinder. There are suction and exhaust ports arranged diagonally at both ends of the body. As the rotor rotates inside the body, the working volume continuously changes due to the invasion or disengagement of teeth, thereby periodically changing the volume between each pair of teeth slots of the rotor to achieve the purpose of suction, compression, and exhaust. The rotor that meshes with each other has several identical working volumes that perform the same working process in sequence during each motion cycle. This working volume is called the elementary volume. It is formed by a pair of tooth surfaces in the rotor, the inner wall surface of the body, and the end cover. By studying the entire working cycle of one of the working volumes, one can gain a comprehensive understanding of the compressor's operation.

1. The host adopts the international third-generation 5:6 asymmetric rotor semi enclosed screw compressor, motor and compressor, integrated, without shaft seal leakage concerns. The control program of two or more compressors is reasonably balanced to balance the negative of the head components

Load, extend the lifespan of the unitTwo sets of compressors with multiple sets of refrigeration circuits are used. When one circuit needs maintenance, the other circuits can still operate normally and have backup functions. The compressor adopts star delta voltage reduction starting to avoid impact on the power grid.

2. The unit has a compact structure, occupies a small area, and saves space in the computer room. When the whole machine leaves the factory, it has undergone strict testing and operation, and can reach the state of on-site use. The vibration group has small movement, and the foundation does not require vibration isolation measures, making installation simple. During installation, only the evaporator chilled water pipe and condenser cooling water pipe need to be connected.

3. The unit can implement intelligent program control according to the demand of the load: 0-25-50-100% capacity control, which significantly saves energy consumption. The total number of parts in a screw compressor is only one tenth of that of a reciprocating compressor, with a simple structure, few vulnerable parts, insensitivity to wet conditions, and a low failure rate. Built in oil separator, using a three-stage oil filtration mechanism, oil and gas separation, wrapped design, can lower the operating noise of the compressor, and the screw compressor can run for more than 40000 hours without failure.

4. Pressure protection: High voltage protection and low voltage protection electrical automatic protection device for motors, under voltage, phase loss, reverse phase, overload, motor overheating, oil shortage, antifreeze protection, etc.: When the temperature of the chilled water is too low, the unit will automatically shut down. Safety valve protection: When the refrigerant pressure exceeds a certain value, the safety exhaust valve will automatically open.

5. Selected LCD touch true color screen (Siemens PLC), microcomputer control, user-friendly and easy to operate main interface, automatic detection of cold water temperature, system effectively tracks on-site usage load by automatically adjusting compressor energy, intuitive and clear display screen, and can read various data during operation for reference at any time. When there is a malfunction, it can automatically sound an alarm in a timely manner and display the cause of the malfunction for easy handling. Relevant feedback information can be output to other main control systems according to on-site needs. The original content can be modified according to the needs on site, such as the location of the air conditioner, various protection points of the unit, pressure, etc

6. Widely used in rubber, plastic, petroleum, chemical, electrical, papermaking, textile, brewing, pharmaceuticals, machinery, food

Beverages, vacuum coating, electroplating, central air conditioning and many other fields. The centralized cooling method facilitates centralized management.

It can be customized as an acid and alkali resistant model to meet the special requirements of customers' special processes.

It can be customized as a low-temperature model, combined with low-temperature refrigerant to meet the special needs of customers' special processes.