| 摘要 |
A compressed gas dispensing station having a high pressure gas compressor with a cyclic control system for selective recirculation of cooled, ultra high pressure gas through the compression chamber after the end of the compression stroke for scavenging hot compressed gas from the compression chamber and providing a residual, partially-expanded replacement gas for the expansion stroke which is mixed with the incoming, new charge of gas for a cryogenic gas at the start of compression and a relatively low temperature gas at the end of compression for a single stage compressor. The cyclic control system times the opening and closing of two delivery valves for separate 4000 psi and a 3600 psi branches, the delivery valve for the 4000 psi branch also regulating recirculation of 4000 psi cooled gas through the compression chamber for the 3600 psi branch after the end of the compression stroke to cool the chamber and replace the hot residual compression gas with a cold expanded gas, which is further expanded in the expansion stroke. Compressed gas is collected and stored in two receiver tanks having different pressures for mixing and dispensing at a customer service station according to customer requirements.
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