Types Of Air Tools

1.Direct drive via flexible coupling.

2.Fully encapsulated CROWNWELL screw compressor block.

3.Standard electric motor Protection Index IP23 and IP54.

4.User friendly service access.

5.Top quality, washable, oil resistant sound insulation.

6.Ready for operation, prewired and fully enclosed.

7.With operating mode selector switch Automatic-Off-Continuous.

8.Centrally mounted cooling fan provided for compressed air and lubricant coolers.

9.Compact and neat cabinet design.

Shaft seal of air compressor

Oil-free screw compressor shaft seal

In an oil-free screw compressor, the compression process is carried out in a completely oil-free environment, which requires a reliable shaft seal between the lubrication area and the gas area of ??the compressor. The shaft seal not only needs to be able to work effectively at high circumferential speeds, but also must have a certain degree of flexibility to adapt to the possible axial movement of the rotor

when the sliding thrust bearing is used. In addition, the material of the shaft seal must be able to withstand the chemical corrosion of the gas compressed by the compressor. At present, the shaft seals of oil-free screw compressors mainly include graphite ring type, labyrinth type and mechanical type.

The seal ring of the graphite ring type shaft seal is made of graphite with a low friction coefficient. As graphite has good self-lubricating properties, there is no hindrance even if the graphite ring is in contact with the journal. In order to ensure the strength andmake the thermal expansion rate of the ring hole the same as the thermal expansion rate of the rotor shaft material, a steel support ring is often installed on the sealing ring. In this way, the gap between the sealing ring and the shaft can be made small, so as to achieve a good sealing effect, and it can work normally in a wide operating temperature range. types of air tools

The graphite ring type shaft seal adopts a ring-shaped corrugated spring to press the sealing ring against the sealing surface to prevent gas from leaking through the two sides of the graphite ring. When the rotation center of the shaft changes, with the help of the ring hole and the spring, the sealing ring also moves to a new position and remains in this position, thereby preventing the occurrence of wear.

The amount of gas leakage through the graphite ring shaft seal is closely related to the gap value, pressure difference, and the number of seal rings. Except for high-pressure occasions, the gas leakage through the combined action of the four shaft seal rings will be reduced by 0.4%. Of course, if the shaft seal is filled with gas, the gas leakage of the compressor will be zero. types of air tools

In the labyrinth shaft seal, there is a small gap between the sealing teeth and the sealing surface, and a tortuous flow channel is formed, which makes the gas flow from the high-pressure side to the low-pressure side to produce great resistance to prevent gas leakage. The sealing teeth can be made on the shaft and rotate together with the shaft, or can be made into a sealing ring with internal sealing teeth and fixed on the body. In most cases, the sealing teeth are machined on a shaft sleeve fixed to the shaft, which is easy to replace when the sealing teeth are damaged.

In oil-free screw compressors, whether graphite ring shaft seals or labyrinth shaft seals are used, there are many options for the air intake holes between the sealing units (5. If the compressed gas can leak into the atmosphere, such as air, Nitrogen or carbon dioxide, etc., so the sealed unit can be arranged in contact, but the last one is open to the atmosphere. If the compressed gas is toxic, flammable, explosive or very expensive, the leaked gas can be led back to the suction pipe. Sometimes it is also It is possible to fill the shaft seal with emotional gas whose pressure is slightly higher than the gas ressure in the compressor to prevent the high-pressure gas from leaking to the outside.

When the speed of the oil-free screw compressor is low, a mechanical seal with oil lubrication can also be used. This kind of shaft seal works reliably and has good sealing performance. However, this type of shaft seal requires a small amount of lubricating oil to flow across the sealing surface, and this lubricating oil may be mixed into the compressed gas. If the compressed gas does not allow such a small amount of pollution, it is necessary to open an oil drain groove between the shaft seal and the compressor cavity. It should be noted that at the working speed of an oil-free screw compressor, the work consumed is comparable when a mechanical seal with oil lubrication is used.

In many occasions, the frictional power consumption of a single shaft seal can reach several kilowatts. In an oil-free screw compressor, four shaft seals are used, so the power consumption of the shaft seal must be considered.

It is worth noting that although the oil-free screw compressor is not sensitive to the liquid contained in the compressed gas, if a large amount of liquid enters the oil-free screw compressor for a long time, the only thing that needs attention is the shaft seal. Many shaft seals are not designed for liquids. In the presence of liquid, the shaft seal will rotate with the shaft interestingly, causing wear. In addition, the liquid will flow into the lubrication area along the gap between the shaft and the shaft seal, destroying the characteristics of the lubricating oil, and affecting the normal lubrication of bearings and gears. types of air tools

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