High-efficiency centrifugal water pump

Abstract

The invention provides a high-efficiency centrifugal water pump. The high-efficiency centrifugal water pump comprises a volute, a water seal, a closed impeller and a water inlet receiving disc, wherein an impeller chamber is formed between the water inlet receiving disc and the volute; the closed impeller is arranged in the impeller chamber, and is fixed on a gasoline engine output shaft of a gasoline engine; a seal cartridge is arranged between the water inlet receiving disc and the closed impeller; and the seal cartridge and the closed impeller are in dynamic seal to prevent the communication of high-pressure and low-pressure water cavities in the impeller chamber and to achieve a floating support effect on the closed impeller. The high-efficiency centrifugal water pump has the following advantages and beneficial effects: as the seal cartridge is arranged, a high-pressure cavity is formed in a water outlet area of the closed impeller, and a low-pressure cavity is formed in a water inlet area of the closed impeller for isolating, the front and back surfaces of the closed impeller are both positioned in the high-pressure cavity, the axial force is self-balanced, the influence of an impeller side gap on the efficiency of the water pump is eliminated, and the efficiency of the water pump is improved; and the side gap of the closed impeller has no influence on the performance of the water pump, so that the size precision requirements of all parts of the water pump are largely reduced, and the processing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of centrifugal water pumps, in particular to a high-efficiency centrifugal water pump in which a closed impeller is supported by radial floating and reliably sealed. Background technique [0002] As an important fluid mechanical equipment in the country's industry and agriculture, water pumps play a pivotal role in economic development. At present, the efficiency of water pumps in the domestic water pump industry, especially in the agricultural irrigation industry, is generally around 30% to 45%. Although the price is low, the energy waste is serious. [0003] In order to improve the efficiency of the water pump, in addition to using computer-aided optimization of the internal flow field of the water pump during design, the main method is to improve the machining accuracy and minimize the backflow of water in the side clearance of the impeller. The corresponding requirement is that the clearance between the ...

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Problems solved by technology

At present, the efficiency of water pumps in the domestic water pump industry, especially in the agricultural irrigation industry, is generally around 30% to 45%. Although the price is low, the energy waste is serious.

[0003] In order to improve the efficiency of the water pump, in addition to using computer-aided optimization of the internal flow field of the water pump during design, the main method is to improve the machining accuracy and minimize the backflow of water in the side clearance of the impeller. The corresponding requirement is that the clearance between the impeller and its mating surface is very small, generally 0.8 ~1.2mm, resulting in high requirements for the dimensional accuracy of the parts of the water pump, which increases the processing cost

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