Brushless multi-working-condition direct-current electrically-driven pump

Abstract

The invention belongs to the technical field of aircraft fuel systems, and relates to a design and a structure of a brushless multi-working-condition direct-current electrically-driven pump. The brushless multi-working-condition direct-current electrically-driven pump is characterized in that a brushless direct-current motor with multi-state working capability drives an impeller which is arranged on a shaft of the brushless direct-current motor to rotate; pumping fuel oil flows through a filter screen, a pump core shell and the impeller to be subjected to centrifugal supercharging, then flows into a radial guide vane for further diffusion supercharging and flows in an axial direction; the supercharged fuel oil passes through an annular flow channel positioned between a pump cover and the shell of the motor to converge and is output through a check valve at the top of the pump cover and a valve shell. The former fuel delivery pump is designed according to the maximum working condition even if being in multiple working states and has no self-adjusting capability, the flow pressure is controlled by virtue of an adjusting valve and the working is carried out on a single curve; however, due to the multiple working conditions which are designed for being matched with the brushless multi-working-condition direct-current electrically-driven pump, the requirement on the current working condition can be rightly met when the pump is in various states, and the pump works on a group of similar flow and pressure curve so as to form a larger working enveloping range.

Description

technical field [0001] A multi-working-condition brushless DC electric pump belongs to the technical field of aircraft fuel systems, and relates to the design and structure of a wide-envelope centrifugal fuel pump driven by a brushless DC motor and capable of working at multiple working conditions. Background technique [0002] For many years, the development of transport aircraft and its fuel pumps has been slow due to the long model replacement cycle and other reasons. The fuel pumps have a single working state, low power-to-weight ratio, low efficiency, and difficult maintenance. The main reason is that these pumps are driven by brushed motors. , low speed, no control, the operating point can not be adjusted or the adjustable range is extremely small. [0003] In recent years, civil aviation aircraft, transport aircraft and seaplanes have continuously improved the requirements of high reliability, long life, easy maintenance, high power-to-weight ratio and adaptive perfor...

AI Technical Summary

Problems solved by technology

[0002] For many years, the development of transport aircraft and its fuel pumps has been slow due to the long model replacement period and other reasons. The fuel pumps have a single working state, low power-to-weight ratio, low efficiency, and difficult maintenance. The main reason is that these pumps are driven by brushed motors. , the speed is low, no control, the operating point is not adjustable or the adjustable range is very small

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