Efficient long-runner impeller low-specific-speed centrifugal pump

Abstract

The invention discloses an efficient long-runner impeller low-specific-speed centrifugal pump. The efficient long-runner impeller low-specific-speed centrifugal pump comprises a centrifugal impeller, an inducer, a transmission shaft, a centrifugal pump shell and sealing structures; the centrifugal impeller and the inducer are in rigid connection; the centrifugal impeller and the inducer are coaxial with the transmission shaft; the centrifugal impeller comprises a front cover plate and a rear cover plate which are in single-arc transition; and the sealing structures are arranged on the outer side of the front cover plate and the outer side of the rear cover plate correspondingly. According to the efficient long-runner impeller low-specific-speed centrifugal pump, the axial length is properly increased, the blade angle distribution of the centrifugal impeller is smoother, the inlet impact loss of the centrifugal impeller is reduced, the work efficiency of the low-specific-speed centrifugal pump is obviously improved, and the problem that due to the long and narrow runner characteristic of the low-specific-speed centrifugal pump, the impeller disc friction loss and the inlet impact loss of the low-specific-speed centrifugal pump are large, and consequently the efficiency of the low-specific-speed centrifugal pump is low is solved.

Description

technical field [0001] The invention belongs to the field of turbine pumps, in particular to a high-efficiency long-channel impeller low specific speed centrifugal pump. Background technique [0002] The turbopump of the liquid rocket engine adopts the gas turbine to drive the oxidant pump and the fuel pump to pressurize and deliver the propellant. Improving the efficiency of the oxidant pump and the fuel pump is the main means to improve the specific impulse performance of the engine; among them, the fuel pump is usually a low specific speed centrifugal pump, and the working The speed reaches tens of thousands of revolutions per minute. However, due to the narrow and long flow path of the impeller of the low specific speed centrifugal pump, the friction loss of the impeller disc and the impact loss of the inlet are large, resulting in low efficiency of the low specific speed centrifugal pump. At the same time, aviation ships and petrochemical Industries such as equipment ge...

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Problems solved by technology

[0002] The turbopump of the liquid rocket engine adopts the gas turbine to drive the oxidant pump and the fuel pump to pressurize and deliver the propellant. Improving the efficiency of the oxidant pump and the fuel pump is the main means to improve the specific impulse performance of the engine; among them, the fuel pump is usually a low specific speed centrifugal pump, and the working The speed reaches tens of thousands of revolutions per minute. However, due to the narrow and long flow path of the impeller of the low specific speed centrifugal pump, the friction loss of the impeller disc and the impact loss of the inlet are large, resulting in low efficiency of the low specific speed centrifugal pump. At the same time, aviation ships and petrochemical Industries such as equipment generally use low-specific-speed centrifugal pumps to complete high-pressure transportation of small-flow media

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