A semi-spiral water-inlet double-suction self-priming pump

Abstract

The invention provides a semi-spiral water intake type double-suction self-priming pump. The semi-spiral water intake type double-suction self-priming pump comprises a water inlet connecting pipe, a double-suction impeller, a pump body, a common shaft, a motor and a support body. The pump body comprises a semi-spiral double-suction suction chamber, a spiral pumping chamber, a gas-liquid separation chamber and a water storage chamber, wherein the end, mounted on the common shaft, of the double-suction impeller is arranged in the pumping chamber of the pump body, and the other end of the common shaft is connected with the motor. The pump body is connected with the motor through the support body. The water inlet connecting pipe is mounted above the pump body. A left backflow hole and a right backflow hole symmetrical with the left backflow hole are formed in the two sides of the bottom of the pumping chamber. A water return port is formed in an outflow diffusion pipe of the pumping chamber, and the diffusion pipe communicates with the gas-liquid separation chamber of the pump body through the water return port. According to the semi-spiral water intake type double-suction self-priming pump, the hydraulic performance of the pump can be effectively improved while the performance of the self-priming pump is guaranteed, and the flow loss of fluid media in the suction chamber and the pumping chamber is greatly reduced; and the semi-spiral water intake type double-suction self-priming pump has the advantages of being high in lift, efficiency and reliability, compact in structure, convenient to mount and maintain, capable adjusting the mounting direction automatically according to the mounting site and the like.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to an external mixing semi-spiral water-inlet double-suction self-priming pump. Background technique [0002] External mixing self-priming pump is a kind of self-priming pump. Because of its compact structure, convenient operation, convenient maintenance, and strong self-priming performance, it is widely used in agricultural drainage and irrigation, river pond breeding, municipal sewage discharge, petrochemical Metallurgy and food chemical industry and power plants and other fields. [0003] The traditional external mixing self-priming pump is mainly composed of impeller, pump shaft, pump body, back cover, bearing body, etc., and the suction chamber set in the pump body mostly adopts S-shaped suction elbow-shaped suction chamber. After two 90-degree direction changes in a short period of time, it will cause a great impact on the pump body, and the liquid flow will be disordered, resu...

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Problems solved by technology

[0003] The traditional external mixing self-priming pump is mainly composed of impeller, pump shaft, pump body, back cover, bearing body, etc., and the suction chamber set in the pump body mostly adopts S-shaped suction elbow-shaped suction chamber. After two 90-degree direction changes in a short period of time, it will cause a great impact on the pump body, and the liquid flow will be disordered, resulting in serious impact loss, low pump efficiency, long-term start and stop, and hydraulic imbalance on one side of the water. Impact, the axial force of the impeller increases significantly, which is easy to cause damage to the bearing and sealing parts, seriously reduces the service life of the bearing and sealing parts, and is not conducive to the long-term stable operation of the pump

At the same time, the traditional external mixing self-priming pump usually only has a return hole on one side of the volute, and the impact of the return on the impeller on one side will also significantly increase the axial force of the impeller, seriously reducing the service life of the bearings and seals. , and the unilateral backflow of the liquid will destroy the uniform and symmetrical flow state in the volute, resulting in a unilateral vortex structure that changes with time in the cross section of the volute. This vortex structure is under the dynamic and static interference of the impeller and the volute It becomes more complicated, not only causes the hydraulic loss in the volute to increase, but also induces serious pressure fluctuations, causing vibration and noise of the unit

[0004] After searching, there are no public reports on patents or articles related to semi-spiral water-inlet double-suction self-priming pumps

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