High-pressure gear pump bearing with sealing structure

Abstract

The invention relates to a high-pressure gear pump bearing with a sealing structure; and the high-pressure gear pump bearing is used for reducing the fuel leakage after pumping when a high-pressure gear pump works, so that the oil supply efficiency of the gear pump is improved. Because of existence of the part machining dimensional tolerance and geometric tolerance, in order to guarantee normal installation of the bearing in a shell cavity, a certain gap is guaranteed between the outer diameter of the bearing and the inner diameter of the shell cavity, so that the fuel leakage is inevitable. The high-pressure gear pump bearing with the sealing structure is provided with a peripheral sealing groove in the outer surface; and an oil passing hole is formed in the end surface bonded with a gear, and is communicated with the sealing groove. High-pressure radial pressure is applied to a rectangular sealing ring in the sealing groove through high-pressure oil to realize peripheral seal. The rectangular-section sealing ring is added on the bearing to guarantee sealing between the bearing and a shell to prevent leakage of the high-pressure fuel in an outlet of the gear pump from the gap between the bearing and the shell.

Description

technical field [0001] The invention relates to a high-pressure gear pump bearing with a sealing structure, which is used for reducing fuel leakage behind the pump and improving the oil supply efficiency of the gear pump when the high-pressure gear pump is working. Background technique [0002] A large number of gear pumps are used in the fuel system of aeroengines to pressurize the fuel and supply fuel to the engine. The gear pumps are required to have high outlet pressure, high fuel temperature, high working efficiency, compact structure, light weight and long service life. In order to ensure the above-mentioned working ability of the gear pump, the bearing structure of the fixed gear in the gear pump is required to have a simple structure, strong pressure bearing capacity, good lubricity, and high sealing performance. Currently, aviation fuel gear pumps use a large number of sliding bearings to fix the gears. [0003] The working principle of the gear pump is that a pair ...

AI Technical Summary

Problems solved by technology

Due to the existence of dimensional and shape tolerances in the processing of parts, in order to ensure the normal installation of the bearing in the housing cavity, a certain gap must be ensured between the outer diameter of the bearing and the inner diameter of the housing cavity, so that fuel leakage is inevitable, especially in Under the condition of high outlet pressure, the leakage here is relatively large, which affects the oil supply efficiency of the gear pump

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