Closed impeller and gas compressor

Abstract

The invention discloses a closed impeller. The closed impeller comprises a rear cover, blades, a sleeve body and a front cover, the front cover covers the blades, the front cover is in a circular truncated cone ring shape, an air inlet surface is a curved surface in smooth transition along the ridge outline of the blades, grooves matched with the ends of the blades are formed in a back air surface, and the ends, corresponding to the grooves, of the blades are embedded into the grooves to be connected in a close fit manner. A flow channel is formed among the blades, the rear cover and the frontcover; and the tail part of the front cover and the rear cover are separated into spaced air outlets by the blades, and air flows out of the air outlets from the front parts of the blades through theflow channel. The invention further discloses a gas compressor comprising the closed impeller structure. The closed impeller is provided with the front cover, so that gas leakage is little, frictionloss is small, flowing resistance is small, and efficiency is high in the working process. The front cover is made of carbon fiber composite materials, and the impeller is light in overall weight andhigh in strength. The splitter blades are arranged, so that blockage of inlet airflow can be reduced, the slip coefficient of an outlet of the impeller can be increased, the impeller efficiency is improved, and the overall efficiency of the gas compressor can be improved.

Description

technical field

[0001] The invention relates to a closed impeller and an air compressor, belonging to the technical field of air compressors. Background technique

[0002] Industrial gas turbines mainly include three major components: compressor, combustor and turbine. The compressor is a component that uses high-speed rotating blades to do work on the gas (mostly air) to increase the pressure of the gas. It compresses the air into high-temperature and high-pressure air, and then supplies fuel to the combustion chamber for combustion. The high-temperature and high-pressure gas generated expands in the turbine. acting. The impellers used in compressors are divided into open type, semi-open type and closed type. The characteristics of the three types of impellers are as follows:

[0003] Open impeller: The friction loss and flow resistance are very large, the impeller efficiency is the lowest, and it is easy to generate vibration, so it is not suitable to work at high speed....

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