Auxiliary circulation water pump for circulating water system

Abstract

An auxiliary circulation water pump for circulating water system is provided, including a condenser having first and second ingress pipes and first and second egress pipes; first water pumps each having a capacity of 50% or 33.3% and connected to a first valve connected to the first ingress pipe; second water pumps each having a capacity of 3-10% and connected to a second valve connected to the second ingress pipe; and a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close the first valves and activates the second water pumps and the second valves, the second water pumps supplying water through the second ingress pipe into the condenser and then discharging through the second egress pipe, and also keeping vacuum of the condenser at design condition (say 7.45 kPaA).

I claim: 
     
         1 . An auxiliary circulation water pump for circulating water system, comprising:
 a condenser, which comprises a first ingress pipe, a second ingress pipe, a first egress pipe, and a second egress pipe;   a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%, each of the first water pumps supplying water through each of the first pipe and the first ingress pipe into the condenser and then discharging through the first egress pipe;   a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe interconnecting with each other, each of the second pipes being connected to the second ingress pipe of the condenser, each of the second water pumps having a capacity of 3-10%; and   a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close each of the first valves and activate each of the second water pumps and each of the second valves, each of the second water pumps supplying water through each of the second pipe and the second ingress pipe into the condenser and then discharging through the second egress pipe, and also keeping vacuum of the condenser at a predetermined level.   
     
     
         2 . The auxiliary circulation water pump for circulating water system according to  claim 1 , wherein the first egress pipe is provided with a main butterfly valve, and the second egress pipe is provided with a bypass valve, the bypass valve having a flowrate corresponding to and matching with the capacity of each of the second water pumps. 
     
     
         3 . An auxiliary circulation water pump for circulating water system, comprising:
 a condenser, which comprises a first ingress pipe, a first egress pipe, and a second egress pipe;   a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%;   a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe, each of the second pipes being connected to the first pipes, each of the second water pumps having a capacity of 3-10%; and   a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to activate each of the second water pumps, each of the second water pumps providing the condenser to proceed with a circulation water operation and allowing vacuum of the condenser to be kept at a predetermined level, each of the second water pumps supplying water through each of the second pipes, the first pipe, and the first ingress pipe into the condenser and then discharging through the second egress pipe.   
     
     
         4 . The auxiliary circulation water pump for circulating water system according to  claim 1 , wherein the first egress pipe is provided with a main butterfly valve, and the second egress pipe is provided with a bypass valve, the bypass valve having a flowrate corresponding to and matching with the capacity of each of the second water pumps.