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A compressor having a fixed cylindrical casing, supporting a rotor having an externally driven input shaft extending rotatably and coaxially in the casing. The rotor includes piston chambers and reciprocable pistons in the piston chamber. A piston rod of each piston is connected to a crankshaft conn

A compressor having a fixed cylindrical casing, supporting a rotor having an externally driven input shaft extending rotatably and coaxially in the casing. The rotor includes piston chambers and reciprocable pistons in the piston chamber. A piston rod of each piston is connected to a crankshaft connected to the rotor for rotation therewith. The casing has fluid suction and discharge ports communicating with the piston chambers during rotation of the rotor to admit fluid through the suction port and discharge compressed fluid from the discharge port. A drive train synchronizes rotation of the crankshafts and the input shaft, a gear tooth ratio of an annular gear to pinion gears on the crankshafts is preferably twice the number of pistons in each rotor block.

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1. A fluid pressurizing device comprising:a fixed cylindrical casing,a rotor in said casing, said rotor having an externally driven input shaft extending rotatably and coaxially in said casing, said rotor including a plurality of piston chambers and respective pistons in said piston chambers, said p

1. A fluid pressurizing device comprising:a fixed cylindrical casing,a rotor in said casing, said rotor having an externally driven input shaft extending rotatably and coaxially in said casing, said rotor including a plurality of piston chambers and respective pistons in said piston chambers, said pistons being reciprocable in said chambers along axes spaced radially from an axis of rotation of said input shaft and said pistons each having a piston rod connected to a crankshaft connected to said rotor for rotation therewith,said casing having fluid suction and discharge ports communicating sequentially with said piston chambers during rotation of said rotor to admit fluid through said suction ports and discharge pressurized fluid from said discharge ports,each said piston chamber being enclosed by a valve casing which has a curved end which is pressed against and matches an inner surface of said cylindrical casing,valves on each said valve casing to provide respective communication between said suction and discharge ports and the respective said piston chamber, anda drive train synchronizing rotation of said crankshafts and said input shaft, said drive train comprising a fixed annular gear secured to said casing and pinion gears on said crankshafts in mesh with said fixed annular gear,said pistons undergoing reciprocal movement in said piston chambers in synchronism in which the pistons have the same stroke position in said chambers, endsaid annular gear and said pinions having a tooth ratio equal to twice the number of pistons. 2. The fluid pressurizing device of claim 1, wherein said rotor includes a plurality of blocks each including a plurality of said pistons and piston chambers. 3. The fluid pressurizing device of claim 2, wherein said piston chambers and said pistons are arranged in said blocks in pairs in opposition to one another. 4. The fluid pressurizing device of claim 1, comprising a crank arm connected to said rotor, said piston rods being connected to respective ends of said crank arm. 5. The fluid pressurizing device of claim 2, wherein each said block includes a mounting plate rotatably supporting one end of the crankshafts of the pistons in said block, and a middle mounting plate disposed between adjacent blocks to rotatably support opposite ends of the crankshafts of the pistons in the adjacent blocks. 6. The fluid pressurizing device of claim 5, wherein said valve casings are secured to said mounting plates. 7. The fluid pressurizing device of claim 1, wherein each piston has a curved end corresponding in shape to the cylindrical casing.