Gear pump for micro-miniature turbojet engine

Abstract

The invention discloses a gear pump used for a microminiature turbo-jet engine, comprising a direct current motor, a pump body, an upper pump cover, a lower pump cover, a shell, a pair of driving and driven gears which are meshed and a driving shaft and a driven shaft. The driving gear is arranged on the driving shaft; the driven gear is arranged on the driven shaft and is aligned and meshed withthe driving gear; the lower pump cover is fixed on the direct current motor, the upper pump cover is connected to the lower pump cover and the plane of the pump body is pressed tightly and sealed so as to lead the structure to be simple; the shell is sleeved at the outside of the lower pump cover; the driving gear and the driving shaft adopt a method of combining clearance fit and a transmission pin to eliminate the installation error of an output shaft of the direct current motor; and an antifriction material is embedded at the positions on the lower pump cover and the upper pump cover corresponding to the driving gear and the driven gear so as to increase the reliability and durability of the gear pump. Most parts of the gear pump adopt aluminium alloy so as to reduce the weight furthest. The gear pump can control the rotating speed of the direct current motor by pulse-width modulation of a single-chip microcontroller and control the flow rate of the gear pump precisely.

Description

technical field [0001] The invention relates to a gear pump for a miniature turbojet engine, belonging to the field of liquid pressure conveying and flow control. Background technique [0002] With the rapid development of science and technology, the micro-turbojet engine for aviation has gradually entered people's sight, and its application is more and more extensive. For aircraft engines, the total weight of the engine and its accessories is a very important parameter. In the weight of all accessories of the engine, the weight of the fuel gear pump occupies an important position. The existing traditional gear pump is difficult to meet the requirements of micro and small turbojet engines due to the complex structure and heavy weight due to the use of various seals and positioning structures, which seriously affects the performance of the engine. Therefore, designing a gear pump with light weight and small volume is a very effective way to reduce the weight of the entire m...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the existing gear pump has a complicated structure and a large weight, which is difficult to meet the requirements of the micro-turbojet engine and seriously affects the performance of the engine, a gear pump for the micro-miniature turbojet engine is proposed.

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