Self-priming pump

Abstract

The invention relates to the technical field of water pumps, in particular to a self-priming pump which comprises a pump body. An impeller chamber, an air and liquid separation chamber, a suction chamber and a liquid storage chamber are arranged in the pump body, an impeller which is connected with a power shaft is arranged in the impeller chamber, the air and liquid separation chamber is communicated with the impeller chamber and the liquid storage chamber, the suction chamber is communicated with an input pipeline and the impeller chamber, the liquid storage chamber is communicated with the impeller chamber, a discharge outlet of the air and liquid separation chamber is connected with an output pipeline, the discharge outlet and a feed inlet in the air and liquid separation chamber are staggered from each other, and backflow outlets and the feed inlet in the air and liquid separation chamber are lower than the discharge outlet. The self-priming pump has the advantages that path locations of backflow liquid can avoid inflow paths of air and liquid mixtures when flow into the air and liquid separation chamber, so that the backflow liquid can smoothly and timely flow back to the liquid storage chamber under the effect of the gravity to circularly flow in follow-up procedures, air can be quickly completely exhausted, and the self-priming characteristics of the self-priming pump can be improved.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a self-priming pump. Background technique [0002] Self-priming pump is a kind of equipment used to transport liquid, which is widely used in the production process of petroleum, chemical industry, smelting, national defense industry and so on. The traditional self-priming pump structure is as follows: figure 1 , consisting of front end cover a, pump body b, impeller c, pump cover d, outlet connection e and other components, the gas-liquid separation chamber part of the self-priming pump is composed of the impeller chamber diffuser f of the pump body b and the outlet connection e , the bottom of the diffusion tube f is provided with an inlet and a return outlet, which are respectively connected to the impeller chamber and the liquid storage chamber, and a partition g is set at the bottom of the diffusion tube f to form an inlet and a return outlet arranged adjacent to each ot...

AI Technical Summary

Problems solved by technology

[0002] Self-priming pump is a kind of equipment used to transport liquid, which is widely used in the production process of petroleum, chemical industry, smelting, national defense industry and so on. The traditional self-priming pump structure is as follows: figure 1 , consisting of front end cover a, pump body b, impeller c, pump cover d, outlet connection e and other components, the gas-liquid separation chamber part of the self-priming pump is composed of the impeller chamber diffuser f of the pump body b and the outlet connection e , the bottom of the diffusion tube f is provided with an inlet and a return outlet, which are respectively connected to the impeller chamber and the liquid storage chamber, and a partition g is set at the bottom of the diffusion tube f to form an inlet and a return outlet arranged adjacent to each other. It is connected with the output pipeline. When the self-priming pump starts to work, the gas-liquid mixture discharged from the impeller chamber is transported from bottom to top through the inlet at the bottom of the diffuser tube f, and the liquid in it rises to the top of the partition g and will be released by gravity. From top to bottom, it falls back to the liquid storage chamber through the return outlet, and the gas is discharged through the outlet connecting pipe e. The gas-liquid mixture ejected from the impeller chamber creates resistance to the return liquid above the partition g, which slows down the falling speed of the liquid, thus affecting the gas flow rate. liquid separation efficiency

In addition, when the output pipeline is bent at a short distance from the outlet connection e, the gas-liquid mixture in the gas-liquid separation chamber will flow away directly through the bent part of the output pipeline, which is used for the storage of exhaust gas. Once the liquid in the liquid chamber is exhausted and the gas in the input pipe has not been exhausted, the pumping function of the pump body will not be realized. Only by filling the liquid storage chamber with exhaust medium again can it be normal until the gas is emptied. Work

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