Air turbine pump with pre-pressing pump

Abstract

The invention relates to an air turbine pump with a pre-pressing pump. The problems that an existing air turbine pump cannot work at low inlet pressure and is low in system efficiency, is complex in system structure, and is difficult to use in a small-size space are solved. The air turbine pump comprises the pre-pressing pump, a speed reducer and a main pump; the pre-pressing pump comprises a front shell, a pre-pressing impeller and a pre-pressing pump shaft, and the pre-pressing impeller is arranged on the pre-pressing pump shaft and is arranged in the front shell; the main pump comprises a middle shell, a rear shell, an induction wheel, a centrifugal wheel, a turbine and a main pump shaft, the induction wheel and the centrifugal wheel are both arranged in the middle shell, the turbine isarranged in the rear shell, the middle shell is correspondingly and fixedly connected with the front shell and the rear shell, the induction wheel and the turbine are arranged on the two sides of themain pump shaft correspondingly, the centrifugal wheel is arranged between the induction wheel and the turbine, the main pump shaft penetrates through the induction wheel and is connected with the speed reducer; and the speed reducer comprises a high-speed gear and a low-speed gear train, the main pump shaft is connected with the high-speed gear of the speed reducer, and the pre-pressing pump shaft is connected with the low-speed gear system of the speed reducer.

Description

technical field [0001] The invention relates to the field of air turbo pumps, in particular to an air turbo pump with a preload pump. Background technique [0002] Aerospace vehicles need to work at high altitudes or in space away from the ground. Due to the constraints of the space size and structural quality of the vehicle, the structural size and quality of the propellant supply system are strictly limited. In order to minimize the structural size and mass, the speed of the propellant pump is getting higher and higher, and in order to reduce the mass and scale of the tank pressurization system, the pressure of the propellant tank is getting lower and lower, and the high speed of the propellant pump And the characteristics of low inlet pressure require the propellant pump to have very high anti-cavitation performance. [0003] In the prior art, the anti-cavitation performance of the pump is usually improved by adding an inducer in front of the centrifugal wheel, but the i...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing air turbo pump cannot work under low inlet pressure, the system efficiency is low, the system structure is complex, and it is difficult to use it in a small space, and to provide a compact structure, high efficiency, anti-cavitation performance Good air turbo pump with pre-compression pump, so that the propellant pump can work well at higher speed and lower inlet pressure

Images