Separate-type rotary engine

1. A rotary engine, comprising:

a compressor having a first rotor, a first hinged vane, an air intake port, and an air outlet; and

an expander having valve, a second rotor, a second hinged vane, an intake port for receiving air and fuel, a combustion chamber, and ignition device, and an exhaust port for discharging exhaust gases, and a valve stick,

wherein a one-way check valve, a compressed air tank, a two-way check valve with a valve stick, and a fuel nozzle and a compressed air valve are interposed between the compressor and the expander,

wherein the first rotor contacts a compressor housing having a first end contacting the compressor housing and another end spaced apart from inner surfaces of the compressor housing to rotate at a central axis of inner circular space of the compressor housing,

wherein the second rotor contacts an expander housing having a first end contacting the expander housing and another end spaced apart from inner surfaces of the expander housing to rotate at a central axis of inner circular space of the expander housing,

wherein the first and second rotors have at least one of a circular and elliptical shape,

wherein the first hinged vane and the second hinged vane have one end hinged to the respective compressor housing and the respective expander housing and the other end contacting outer surfaces of the rotating first rotor and the rotating second rotor for operation, wherein the first hinged vane and the second hinged vane are formed in the shape of a blade and is are arranged closely to contact the respective first rotor and the respective second rotor by the difference of fluid pressure on both sides of the hinge vanes during compression and expansion process respectively,

wherein a combustion chamber is formed as an airtight space by a depressed surface of the housing of the expander and a surface of the second hinged vane, the combustion chamber inhales air, said inhaled air passes via the air intake port in a front end of air intake space of the compressor is and compressed at a high pressure and stored in the compressed air-tank interposed between the one-way check valve and the two-way check valve through the compressed air outlet positioned at an end of the compression space,

wherein a pressure difference between the compressor and compressed air tank open and close the one-way check valve, and wherein the intake port at the expander is closed by the two-way check when the fluid pressure difference between compressed air tank and combustion chamber exists,

wherein the second hinged vane pushes the valve stick upwardly to open the two-way check valve for supplying the compressed air from the compressed air tank to the combustion chamber and simultaneously closes the combustion chamber,

wherein compressed air from the compressed air tank and fuel from the fuel nozzle are supplied to the combustion chamber through the path formed by opened position of the two-way check valve, and wherein the ignition device starts combustion process in the combustion chamber, and

wherein high pressure combustion gas in the combustion chamber pushes the two-way check valve further upward to close the intake port of the expander to prevent the combustion gas flowing back to the compressed air tank,

wherein the second hinged vane opens as the second rotor rotates and the high pressure combustion gas in the combustion chamber discharges to the expander to push the second rotor to rotate until the second rotor passes the exhaust port, and

wherein the two-way check valve moves down to close the intake port preventing the fresh air in the compressed air tank from being wasted to expander while the second hinged vane is opened and the combustion chamber pressure is lower than the compressed air tank pressure.

2. The rotary engine according to claim 1 , wherein the combustion chamber comprises a fuel injecting nozzle positioned at the intake port of the expander and a reduced combustion chamber is formed by the second rotor as being rotating to reduce a volume of the chamber to form a compression rate at which the air supplied by the compressor through the compressed air tank rises to a temperature to ignite and combust fuel directly injected by the fuel injecting nozzle to the combustion chamber.

3. The rotary engine according to claim 1 , further comprising:

an open/shut air intake port positioned in the compressor housing to obtain appropriate compression rate in the compressor in a rotational direction of the first rotor,

wherein the open/shut air intake port forms a variable compression rate by escaping the air through the air intake port, and compression is not performed until the first rotor passes the open/shut air intake port, and the air intake port opens after the first rotor passes the open/shut air intake port and has the compressed air volume reduced thereby lowering the compression rate.