Power saving vacuum machine for improving vacuum ability of condenser of thermal power generator

A power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator, the power saving vacuum machine being installed after the condenser;

• the condenser including a vacuum primary tube for receiving external inputting vapor;
• the power saving vacuum machine comprising:
• a least one valve installed on the vacuum primary tube for sealing the vacuum primary tube to prevent air from entering into the condenser;
• a front stage pump including inlet and an outlet;
• the inlet of the front stage pump being connected to an air inlet tube;
• at least one root vacuum pump including a main root vacuum pump;
• the main root vacuum pump including an inlet and a vent opening;
• the inlet of the main root vacuum pump being connected to a rear end of the vacuum primary tube;
• wherein when the at least one root vacuum pump is only one pump which is the main root vacuum pump, the vacuum primary tube of the main root vacuum pump is connected to the inlet of the front stage pump through a third transfer tube;
• wherein when the at least one root vacuum pump is a plurality of root vacuum pumps;
• the plurality of root vacuum pumps are connected serially;
• the plurality of root vacuum pumps includes a main root vacuum pump and at least one middle root vacuum pump;
• each middle root vacuum pump includes an inlet and a vent opening;
• the vent opening of the main root vacuum pump is connected to the inlet of a respective middle root vacuum pump through a first transfer tube;
• the vent opening of each middle root vacuum pump is connected to an inlet of a next middle root vacuum pump through a second transfer tube;
• a vent opening of the last middle root vacuum pump is connected to an inlet of the front stage pump through the third transfer tube.