Foldable direct current cylinder body, straight -flow air pressure machine and double -cylinder straight -flow air pressure machine

The utility model provides a foldable direct current cylinder body, straight -flow air pressure machine and double -cylinder straight -flow air pressure machine belongs to air compression device, foldable direct current cylinder body wherein, including flexible pipe, snifter valve and discharge valve, flexible pipe is including first opening and second opening, flexible intraduct forms the gas storage space, first opening is provided with first closing plate, is provided with first through -hole on the first closing plate, the second opening is provided with the second closing plate, is provided with the second through -hole on the second closing plate, discharge valve seal installation is on first closing plate, snifter valve seal installation is on the second closing plate, gas in the gas storage space can be discharged through discharge valve, and the gas outside the gas storage space can inhale the gas storage space through the snifter valve. Can shorten the air current stroke through foldable direct curr