Fast self-priming jet-type centrifugal pump

Abstract

The invention discloses a fast self-priming jet-type centrifugal pump. A bowl-type valve, a backflow pipe, a jet nozzle and a pump inlet are arranged on a backflow hole on a sixth section of the pumpbody to form liquid self-circulation system. The working principle centrifugal pump is that two third liquid is stored in the pump body, the pressure generated by high-speed rotation of an impeller issmall, the valve on the backflow hole of the pump body is open, and partial liquid flows into the jet nozzle. The outlet of the nozzle is designed into the structure which contracts first and then spreads, the nozzle has large area of jet which is in a shape of loudspeaker, has strong gas-liquid entrainment of pump inlet pipeline, and drains off the air and yields water of pump inlet pipeline. The pump body achieves design value at this time, the valve on the backflow hole closes automatically, and the nozzle stops working, so that efficiency of the pump is improved by more than 5% compared with that of traditional self-priming pumps.

Description

technical field [0001] The invention belongs to fluid machinery, in particular to a fast self-priming jet-type centrifugal pump, which is mainly suitable for industrial water supply, sewage treatment, agriculture, nursery, tea garden irrigation, forests, urban buildings, commercial network fire extinguishing and other places. Background technique [0002] At present, there are two main structural forms of ordinary self-priming centrifugal pumps, one is the internal mixing self-priming centrifugal pump structure, and the other is the external mixing self-priming centrifugal pump structure. The self-priming time of these two pumps is due to its structural principle The self-priming speed of the pump is slow, which especially brings inconvenience to work in places such as forest fire fighting. Contents of the invention [0003] In order to solve the reasons such as the slow self-priming speed of existing self-priming centrifugal pumps, the present invention provides a fast se...

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Problems solved by technology

[0003] In order to solve the reasons such as the slow self-priming speed of existing self-priming centrifugal pumps, the present invention provides a fast self-priming jet-type centrifugal pump. ), nozzle throat straight pipe, re-diffuser pipe (trumpet shape)

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