VARIABLE-CAPACITY ROTARY PUMP-COMPRESSOR Russian patent published in 1995 - IPC

FIELD: rotary machines with control of flow of working medium without stopping the working members. SUBSTANCE: pump-compressor has rotor made in form of isosceles triangle with truncated vertices mounted coaxially in stator with profiled grooves and end covers, spring-loaded blades, received by stator grooves and working medium distributor which is brought in communication with beginning of suction. End cover is provided with suction and bypass holes which are located under blades and are brought in communication with distributor by means of pipe lines. Number of blades is divisible by 2. Control of capacity is effected by means of distributor which opens and closes holes which are brought in communication with bypass and suction holes by means of pipe lines. EFFECT: enhanced reliability. 3 dwg