SCREW COMPRESSOR WORKING PRINCIPLE AND USE IN DISTRICT COOLING

27-12-2019

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Usually, the male rotor connects to the motor, acting as the driving rotor, while the female rotor is driven. As the two rotors rotate, volume in their grooves reduces thereby compressing the refrigerant.

We could view the operation process in the following stages:

  • First stage: the inlet port of the compressor takes the refrigerant.

  • Second stage: tooth space reduces as the seal line goes in the direction of discharge. Compression takes place.

  • Third stage: compression continues up to the point where both rotors are at the discharge port. Pressure is high at this point.

  • Fourth stage: with the seal line at the discharge, the tooth space discharges the refrigerant


TYPES OF SCREW COMPRESSORS-REASON TO CHOOSE CAREFULLY

Searching for a suitable screw compressor is daunting for cannot differentiate screw compressor working principles. Interestingly, screw compressors are either single-screw or twin-screw type.

 

SINGLE-SCREW COMPRESSOR

The single screw compressor comprises of two gate rotors and a main rotor. The main rotor, which is the driving rotor, meshes with the gate rotors to produce the compression process.

TWIN-SCREW COMPRESSOR

Unlike the single screw compressor, the twin-screw compressor comes with helical grooved two rotors. As the two mesh, fluid flows in the axial direction. This compressor is very common in commercial and industrial applications.

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SCREW COMPRESSOR PARTS AND APPLICATIONS

THE PARTS

The screw compressor is a positive displacement machine that comes with two helical lobed rotors that mesh as indicated in Figure 1. The two rotors in a casing create working chambers that are the basis of the operation of a screw compressor. We can categorize the parts as follows:

1. ROTOR

There are two rotors, the male and the female rotors. Normally, the female rotor is bigger than the male rotor. It is also driven by the prime mover and consequently it rotates the male rotor.

2. SUCTION VALVE

This is the section of the compressor where gas control takes place. It can be controlled pneumatically or electrically.

3. PRIME MOVER (TYPICALLY AN ELECTRIC MOTOR)

The compressor draws its power from the electric motor or any other prime mover depending on design. You can also expect to find different power transmission systems with different manufacturers and models.

4. OIL SECTION

It comprises of the oil tank, oil filter and oil separator.

 

As you can expect from the categorizations, the screw compressors features many precision parts. These include couplings, gears, plungers, housings and belts. For advanced efficiency, the device also comes with an air receiver for buffering and storage applications between the compressor and the consumption system. The receiver is further categorized as primary receiver and secondary receiver.

The screw compressor also features the air dryer whose role is to remove water vapor from the air. This prevents serious operational problems in the system including process obstruction and corrosion. Below are other parts of the screw compressor, some of which are visible in Figure 1.

  • Screw(s)

  • Rotors

  • Intake port

  • Discharge port

  • Oil separator

  • Slide valves

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APPLICATIONS OF THE SCREW COMPRESSOR

The screw compressor is a critical component in many industries that ARANER deals with. In the food processing industry, the product is important in food cooling, pressurized transport and agitation. The product also features in pharmaceutical facilities where it is used in packaging, aeration and pill manufacturing.

In summary, the machine is common in the following other industries:

  1. Civil engineering and construction

  2. Machinery

  3. Pulp and paper

  4. Electronics

  5. Automobiles

  6. Theme parks

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BENEFITS OF SCREW COMPRESSOR

Many industries use the screw compressor because of ease of maintenance, overall economy and simplicity. The compressor has been lauded for its high specific output, which is crowned by the usually small size of the devices. Maintenance is flawless thanks to the few parts. With new technology, you can expect a screw compressor to run efficiently also.  Fewer parts means minimal vibration, which is another reason district cooling establishments should install these compressors. Do not forget that refrigerant loss is almost non-existent for these products.

With input from an experienced player such as ARANER, you can confidently use a screw compressor for your district cooling and other industrial applications.



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