The difference between a scroll machine and a screw machine

Scroll machine and screw machine are two common models in the field of compressed air. The core difference lies in the compression principle, applicable scene and operating characteristics. Granklin water lubricated single screw air compressor adopts the structure of single screw plus star wheel, which belongs to the category of screw machine. Its design advantages can meet the scene requirements with high requirements for stability and cleanliness.

1. Difference in compression principle

• scroll machine: Gas compression is achieved through the relative motion of the moving scroll and the static scroll. The dynamic vortex moves circumferentially around the static vortex, and the gas is gradually compressed in the crescent-shaped cavity formed by the vortex and finally discharged from the center. The compression process is continuous and smooth, with low noise and vibration.
• screw machine: divided into single screw and twin screw two. The double-screw machine compresses the gas through the meshing movement of the yin and yang rotors; the single-screw machine used by Grantkering consists of a single main screw and two star wheels. The rotation of the main screw drives the star wheels to swing, and the gas is gradually compressed in the sealed cavity formed by the screw groove and the star wheels. The structure is simpler, the friction parts are less, and the operation is more stable.

2. Applicable displacement scenario

• scroll machine: Usually suitable for small displacement scenes (such as 1-15m & sup3;/min), common in medical equipment, small laboratories, household equipment and other noise-sensitive or low gas scene.
• screw machine: The scope of application is wider, and the single screw machine can cover the demand for large and medium displacement (such as 1-50m & sup3;/min), which is suitable for scenes with high pressure stability or gas cleanliness requirements such as automatic production lines in manufacturing industry, high-purity gas in electronic industry, compression of special chemical gas, etc. Granklin single screw machine with its stable structure, especially suitable for the need for continuous, uniform pressure output of the scene.

3. Operational stability and maintenance costs

• scroll machine: Due to the compact structure, few friction parts, low operating noise and low vibration, but in large displacement scenarios, it is easy to wear due to uneven force on the moving scroll, long-term operating stability may be limited, and maintenance costs are high.
• screw machine: The main screw of the single screw machine is designed to match the star wheel plate, with low running friction, uniform force, and better vibration and noise control than the double screw machine. At the same time, water lubrication replaces traditional oil lubrication (such as Granklin model), which avoids possible faults (such as oil deterioration and pipeline blockage) caused by oil circuit system and reduces maintenance complexity and cost.

4. Gas cleanliness suitability

• scroll machine: If the oil-free design is adopted, clean gas can be provided, but the sealing requirements are higher in large displacement scenarios, otherwise particles are easily generated due to friction.
• screw machine the granklin single screw machine completely eliminates the oil circuit system through the water lubrication structure to ensure that the gas is free of oil pollution. At the same time, the low friction characteristics of the single screw and the star wheel reduce the dust particles generated by mechanical wear, and the output gas has high cleanliness, which is suitable for scenes with strict air quality requirements such as electronics and medical treatment.

In summary, scroll machines and screw machines have their own applicable scenarios: scroll machines are suitable for small displacement and low noise requirements; screw machines (especially single screw machines) are more suitable for industrial scenarios with large displacement and high requirements for pressure stability or gas quality by virtue of stable structure, low maintenance cost and high cleanliness. Granklin water-lubricated single-screw air compressor further strengthens the advantages of screw machine in stability and cleanliness through the design of single screw plus star wheel.