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Multi-stage gas compressing apparatus

Multi-stage gas compressing apparatus description/claims

The present invention relates to a multi-stage gas compressing apparatus, and particularly to a multi-stage gas compressing apparatus in which a compressed gas is compressed by a plurality of gas compressors gradually.

JP2003-97466A discloses an oilless gas compressor in which a compressed gas introduced in the cylinder from the inlet is compressed by the piston which reciprocates with rotation of the crankshaft via the connecting rod in the crank case and is discharged from the outlet into a storage tank.

Nowadays, it is necessary to use an oilless compressor providing high discharge pressure of more than 2 MPa.

The oilless compressor used under high pressure is expensive and poor in durability. It is free of oil. Grease-containing bearings and air seals are short in life. So it is required to use a number of parts for maintenance, and parts used under low pressure cannot be used.

In a booster compressor in JP2000-34980A, a compressed gas is introduced in the cylinder of the compressor body and stored in the storage tank. The compressed gas in the storage tank is introduced to the compressor body again via the bypass conduit. By repeating the compression, the compressed gas in the storage tank is compressed gradually.

In the booster compressor, the compressed gas in the storage tank is directly introduced in the cylinder of the compressor body. Thus, the inside of the crank case for actuating the piston is always kept at atmospheric pressure.

As the compression step becomes high pressure, the pressure difference between the cylinder and the crank case increases. Especially the piston returns more rapidly in the reciprocating step.

Parts such as bearings for the crankshaft is subjected to more load, thereby reducing its life.

In view of the disadvantages, it is an object of the invention to provide a multi-stage gas compressing apparatus that can be operated under high pressure, similar parts to those under low pressure being used, lives of parts being extended.

The features and advantages of the invention will become more apparent from the following description with respect to embodiments as shown in accompanying drawings.

FIG. 1 is a vertical sectional view of a booster compressor used in one embodiment of a multi-stage gas compressing apparatus according to the present invention.

FIG. 2 is a block diagram showing one embodiment of a multi-stage compressing process.

FIG. 1 is a booster compressor used in one embodiment of a multistage gas compressing apparatus according to the present invention.

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