Back-to-back air compressor

Abstract

The invention discloses a back-to-back air compressor which comprises a rotating shaft. The rotating shaft is sleeved with an impeller set and a motor, the impeller set is covered with a stator, the impeller group comprises a pair of impellers, the air back surfaces of the pair of impellers are opposite to each other, are in contact with each other, and are mutually fixed into a whole or are integrally formed through casting, and furthermore, impellers are provided with front covers, and the front covers are in a circular truncated cone ring shape. The air inlet surfaces of the front covers are curved surfaces in smooth transition along the outline of a blade ridge line, and grooves matched with the end part of a blade are formed in the air back surfaces. Furthermore, one or more circles of air holes are evenly formed in the portion, right opposite to the impellers or the front covers, of the stator, air can be decomposed into axial airflow and radial airflow after entering the air holes, the impellers are suspended in the stator to stably rotate through the radial airflow, the impellers are pushed backwards through the axial airflow, and the stator is used as an air bearing and plays a role of a radial bearing and a thrust bearing at the same time. The back-to-back air compressor adopts a double-sided air inlet mode and has the advantages of being large in flow, small in size,capable of balancing axial force and the like.

Description

technical field [0001] The invention relates to a back-to-back compressor, which belongs to the technical field of 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. [0003] The compressor in the prior art usually has one impeller. If you want to increase the flow rate, you need to add multiple sets of impellers, which occupy a large volume and require a long enough shaft for installation, which increases the axial size of the compressor and makes it difficult to balance. question. In addition, the current compressors generally use a...

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Problems solved by technology

[0003] The compressor in the prior art usually has one impeller. If you want to increase the flow rate, you need to add multiple sets of impellers, which occupy a large volume and require a long enough shaft for installation, which increases the axial size of the compressor and makes it difficult to balance. question

In addition, the current compressors generally use a bearing group composed of multiple radial bearings and thrust bearings, which also require a sufficiently long shaft for installation, which brings about the problem of increasing the axial size of the compressor. If this type of compressor is used in In equipment such as micro gas turbine generator sets, the space occupied by the equipment will be increased, and the overall weight will be increased at the same time, which is not conducive to integrated design; and the processing and assembly errors caused by arranging multiple bearings will increase, making processing and assembly difficult

Furthermore, the impellers used in current compressors are mostly semi-open impellers, and there is still room for improvement in terms of how to obtain smaller friction loss and flow resistance, higher efficiency, light weight and high strength.

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