of the mother wheel rotor 3 and the size of the opening of the hole slot 4 is also less than that of the hole slot 5 both sides of the hole slot of the child wheel rotor 2 are provided with sealing rings 84 configured to be fixed in slots of the case body and a child wheel nozzle sealing member 28 is provided between the sealing rings 84 both sides of the hole slot of the mother wheel rotor 3 are provided with sealing rings 20 configured to be fixed in slots of the case body and a mother wheel nozzle sealing member 29 is provided between the sealing rings 20 the rotation shaft 19 is mounted on the base body 1 through two bearings 6 both ends of the rotation shaft 19 extending out of the case body with one end fitted with an inertial flywheel 8 and a power output wheel 9 and the other end fitted with a cam control output wheel 10 exhaust blocking members 38 are provided on the bottom of the case body 1 close to the child wheel rotor 2 and the mother wheel rotor 3 respectively and the exhaust blocking members 38 are arranged between the sealing rings 84 and the sealing rings 20 respectively the two exhaust blocking members 38 are fixed on the case body 1 via a spring screw 49 the child wheel rotor 2 the case body 1 and the sealing ring 84 form an exhaust region 88 the mother wheel rotor 3 the case body 1 and the sealing ring 20 form a further exhaust region 88 and the exhaust region 88 is communicated with the exhaust pipe 16 an exhaust pipe 16 is provided on the bottom of the case body.