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

Abstract

A power saving vacuum machine serves for improving vacuum ability of a condenser of a thermal power generator. The vacuum machine being installed after the condenser and includes a least one valve installed on the vacuum primary tube for sealing a vacuum primary tube to prevent air from entering into the condenser; a front stage pump has an inlet 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. The at least one root vacuum pump may be only one pump which is the main root vacuum pump, or the at least one root vacuum pump is a plurality of root vacuum pumps which are connected serially.

What is claimed is: 
     
         1 . 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.   
     
     
         2 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein the at least one valve includes one of an auto valve sheet and a manual valve sheet. 
     
     
         3 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein each through holes is a two blade root vacuum pump, a three blade root vacuum pump, or an air cooling root vacuum pump. 
     
     
         4 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein the front stage pump drains air out to exterior directly. 
     
     
         5 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein the front stage pump is one of a water circulation vacuum pump, a liquid circulation pump used in vacuuming of the condenser or a vacuum device for retaining vacuum of the condenser. 
     
     
         6 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 5 , wherein the outlet of the front stage pump is connected to a vapor separator which is used to separate mixture of air and water outputted from the front stage pump into air and water; the air is drained out and the water flows to a lower end of the vapor separator which is formed as working water by a cooler of a heat exchanger and then returns back to the front stage pump as a working water for operation of the front stage pump. 
     
     
         7 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 2 , wherein each root vacuum pump is connected to a driving motor and a cooling device for driving cooling water into the root vacuum pump. 
     
     
         8 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 7 , wherein the root vacuum pump is further arranged with a pressure detector and a temperature detector; the pressure detector is arranged at the inlet of the root vacuum pump for detecting pressure of tubes of the root vacuum pump; the temperature detector serves to detect temperature of the root vacuum pump; the pressure detector and the temperature detector are connected to a control device which is further connected to the driving motor and the cooling device; the control device receives the data from the pressure detector and the temperature detector so as to control the driving motor and the cooling device. 
     
     
         9 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein a returning tube is installed at a front side of the valve and is connected between the vacuum primary tube and a section for receiving returning water to prevent condensed vapor from flowing to the vacuum pump. 
     
     
         10 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein each of the first, second and third transfer tubes are equipped with a cooler or a heat exchanger. 
     
     
         11 . The power saving vacuum machine for improving vacuum ability of a condenser of a thermal power generator as claimed in  claim 1 , wherein the third transfer tube is equipped with a check valve for preventing air from flowing back to the root vacuum pump or the condenser due to any abrupt condition.