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Classifications of Industrial Water Chillers

ClassificationIndustry News 43

Classifications of Industrial Water Chillers

 

The chiller operating system is composed of four basic components: compressor, evaporator, condenser and expansion valve. They are connected in turn by pipes to form a closed system. The refrigerant circulates continuously in the system, changes its state, and exchanges heat with the outside world.

The basic principle of industrial chiller: after the liquid refrigerant absorbs the heat of the cooled object in the evaporator, it is vaporized into low-temperature and low-pressure steam, sucked in by the compressor, compressed into high-pressure and high-temperature steam, and then discharged into the condenser. It releases heat to the cooling medium (water or air), condenses into a high-pressure liquid, is throttled by an expansion valve into a low-pressure and low-temperature refrigerant, and then enters the evaporator again to absorb heat and vaporize to achieve the purpose of circulating refrigeration. In this way, the refrigerant goes through four basic processes of evaporation, compression, condensation and throttling in the system to complete a refrigeration cycle. In the chiller, the evaporator, the condenser, the compressor and the expansion valve are the four essential parts in the refrigeration system, among which the evaporator is the equipment for conveying the cooling capacity. The refrigerant absorbs the heat of the object to be cooled in it to achieve refrigeration. The compressor is the heart and plays the role of inhaling, compressing and transporting the refrigerant vapor. The condenser is a device that emits heat, and transfers the heat absorbed in the evaporator together with the heat converted by the compressor work to the cooling medium to take away. The expansion valve throttling and depressurizing the refrigerant, controls and adjusts the amount of refrigerant liquid flowing into the evaporator at the same time, and divides the system into two parts: the high-pressure side and the low-pressure side. In the actual refrigeration system, in addition to the above four components, there are often some auxiliary equipment, such as solenoid valves, distributors, dryers, collectors, fusible plugs, pressure controllers and other components, which are to improve the operation. Set for economy, reliability and safety.

Industrial chiller classification:

1. Scroll compressor

The principle of the scroll compressor is that the eccentric shaft drives the moving sliding plate to swing around the axis of the fixed sliding plate to complete the functions of air intake and compression. Compared with the rotary type, the scroll compressor not only has no crankshaft connecting rod intake and exhaust valves, but also has no sliding vanes and exhaust valves necessary for the rotary type, which greatly improves the reliability of the work and makes the work more efficient. reliable. The piston of a scroll compressor is the moving slide that oscillates around the axis of the fixed slide. However, the manufacturing and processing requirements of scroll compressors are very high, and the processing cost directly affects the cost and application.

2. Open piston compressor

The compressor is composed of a piston compressor driven by a motor through a coupling or a belt. Because there are many joints and shaft seals leaking refrigerant, the refrigeration system needs to be filled with refrigerant regularly, so it is called an open piston compared with a fully enclosed piston compressor. compressor.

3. Fully enclosed piston compressor

The fully enclosed piston compressor solves the leakage of refrigerant during the working process of the open piston compressor, and solves the leakage of refrigerant during the working process of the entire refrigeration system through all the welding of the entire refrigeration system interface, which greatly improves the work of the entire refrigeration system. reliability. However, the inherent faults of the intake and exhaust blades of the piston compressor, the influence of the crankshaft connecting rod piston, which converts the rotary motion of the motor into reciprocating linear motion, on the efficiency, the sticking of the rotating part, and the influence of the piston clearance on the efficiency, etc. not solved.

The piston of the rotary compressor is like a rotor rotating in a flat round box. The piston is mounted on a flat mandrel and rolls flatly along the side wall of the cylinder to act on the refrigerant in the cylinder. In order to separate the suction area and the exhaust area, a vertical groove is opened on the side wall of the cylinder, and a sliding vane that cooperates well with the rotor and can be pressed into the groove of the side wall of the rotor is installed in the groove. Compared with piston compressors, it eliminates the failure of intake blades, the influence of crankshaft connecting rods, which convert the rotary motion of the motor into reciprocating linear motion, on the efficiency, the jamming of the crankshaft connecting rods, and the effect of piston clearance on efficiency, etc. question. The technology of small refrigeration compressors has been greatly improved, and the efficiency has been greatly improved. However, the sealing of the sliding blade and the failure of the exhaust cutting blade have not been completely solved.

4. Rotary (sliding vane) compressor

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