Multistage compressor
AssigneeTokico Ltd.
InventorAkiharu Odagiri
Life of this patent
Estimating the term…
Abstract
A multistage compressor includes a lower pressure side compression part, a higher pressure side compression part, an intermediate conduit placing the lower and higher side compression parts in communication, and a cooler disposed midway of the intermediate conduit for allowing gas to flow from the lower pressure side compression part to the higher pressure side compression part and for cooling the flowing gas. The cooler includes a drain outlet port. The compressor further includes an electromagnetic valve disposed at the drain outlet port and a controller for controlling the valve. The valve is opened when the compressor is started or re-started after a pause, is kept open during a predetermined period of time, and is then closed.
Claims4
A multistage compressor comprising:
- a compressor body including a lower pressure side compression part, a higher pressure side compression part and a motor for actuating said lower pressure side and higher pressure side compression parts to compress gas;
- an electromagnetic switch connected to said motor to energize and de-energize the motor;
- a tank connected to said higher pressure side compression part so as to receive pressurized gas therefrom and store the pressurized gas;
- a pressure sensor which senses the pressure in said tank;
- an intermediate conduit placing said lower pressure side and higher pressure side compression parts in communication with one another;
- cooler means disposed in said intermediate conduit for cooling gas flowing therethrough, said cooler means having a condensate discharge outlet;
- an electromagnetic valve disposed at said condensate discharge outlet;
- and
- control means operatively connected to said pressure sensor and said electromagnetic switch for selectively energizing and de-energizing said motor by turning on and off said electromagnetic switch depending on signals from said pressure sensor, and said control means also operatively connected to said electromagnetic valve for opening said electromagnetic valve during a predetermined period of time after said electromagnetic switch is turned on to start or re-start the compressing operation of the compressor and for closing said electromagnetic valve upon the lapse of said predetermined period of time.
Dependencies are inferred from the claim text.