Cavitation-preventing device for condensate pump

Abstract

The invention discloses a cavitation-preventing device for a condensate pump. The cavitation-preventing device for the condensate pump is arranged among the condensate pump, a water inlet pipeline anda water outlet pipeline. The cavitation-preventing device comprises a gas-liquid separation assembly, a drainage assembly, an inlet pipe, a liquid outlet pipe, a gas outlet pipe and a pump-out pipe.The gas-liquid separation assembly is connected with the water inlet pipeline through the inlet pipe and connected with an inlet of the condensate pump through the liquid outlet pipe. The pump-out pipe is connected with an outlet of the condensate pump and the water outlet pipeline. The drainage assembly is arranged on the pump-out pipe. The gas-liquid separation assembly is connected with the drainage assembly through the gas outlet pipe. The installation height of the gas-liquid separation assembly is larger than that of a water inlet of the condensate pump. The drainage assembly comprises afirst jet device, a branch pipe and a second jet device. The first jet device and the second jet device are Venturi tubes. The first jet device is arranged on the pump-out pipe. One end of the branchpipe is connected to the portion, which is located in front of the first jet device, of the pump-out pipe, and the other end of the branch pipe is connected to the throat portion of the first jet device. The second jet device is arranged on the branch pipe. The throat portion of the second jet device is connected with the gas outlet pipe.

Description

technical field [0001] The invention relates to the technical field of condensed water pumps, in particular to a condensed water pump anti-cavitation device. Background technique [0002] In power plants, whether it is thermal power or nuclear power, steam is used to drive steam turbines to generate electricity, and the steam that has passed through steam turbines turns into low-pressure, low-temperature steam, and after condensation, it becomes condensed water, although it is called condensation in name However, its actual temperature is still higher than that of ordinary liquid water. If this high-temperature and low-pressure liquid water is directly sent into the pump for pumping, it is easy to cause cavitation, that is, the water body is vaporized at the inlet of the pump and then Bubbles burst after slight pressurization and damage the impeller. [0003] In the prior art, the cavitation performance is usually improved by reducing the installation height of the condensa...

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Problems solved by technology

[0002] In power plants, whether it is thermal power or nuclear power, steam is used to drive steam turbines to generate electricity, and the steam that has passed through steam turbines turns into low-pressure, low-temperature steam, and after condensation, it becomes condensed water, although it is called condensation in name However, its actual temperature is still higher than that of ordinary liquid water. If this high-temperature and low-pressure liquid water is directly sent into the pump for pumping, it is easy to cause cavitation, that is, the water body is vaporized at the inlet of the pump and then Bubbles burst after slight pressurization and damage the impeller

[0003] In the prior art, the cavitation performance is usually improved by reducing the installation height of the condensate pump. It is common for the condensate pump to be installed below the ground and surrounded by a metal cylinder, which is similar to a cylindrical cylinder, so it is also called "barrel bag pump". ", this method of improving cavitation performance is very costly in civil engineering, and the condensate pump is less economical when the flow rate is small, and it is impossible to move and change the pipeline at all, so the transformation capacity of the circulating water system is greatly limited

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