Two-stage air suspension centrifugal compressor capable of reducing radial force

Abstract

The invention relates to the field of compressors, in particular to a two-stage air suspension centrifugal compressor capable of reducing radial force. The two-stage air suspension centrifugal compressor comprises a motor shell, a motor shaft, an air bearing device, a first volute, a first impeller, a second volute and a second impeller. Each volute body is provided with a partition tongue, a first spiral section, a second spiral section and a diffusion section, wherein the first spiral section starts from the partition tongue and ends at the intersecting line of the diameter of a volute base circle in the vertical direction and the volute body. Each partition plate is provided with a spiral section and a horizontal section, wherein the spiral section is the same as the corresponding first spiral section in shape and is in central symmetry with the corresponding first spiral section relative to the volute base circle, and the horizontal section is tangent to the spiral section and is distributed in the horizontal direction. According to the compressor, the partition plates are arranged in the volutes to divide volute chambers into the inner volute chambers and the outer volute chambers, and it is guaranteed that airflow at outlets of the volutes is stable; and the spiral sections which are the same as the first spiral sections in shape and is in central symmetry with the first spiral sections relative to the volute base circles are arranged on the partition plates, so that radial stress of the volutes is more uniform.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a two-stage air suspension centrifugal compressor with reduced radial force. Background technique [0002] The centrifugal fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induction of boilers and industrial furnaces; cooling and cooling of air conditioning equipment and household appliances Ventilation; drying and selection of grain; wind tunnel wind source and inflation and propulsion of hovercraft, etc. [0003] Chinese utility model patent application (publication number CN208417019U, publication date: 20190122) discloses a high-speed two-stage centrifugal blower based on an aerodynamic pressure bearing, including a motor; a ...

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Problems solved by technology

[0004] The prior art has the following disadvantages: the volute of the compressor volute is helical with an asymmetric cross-section, and when the first helical section of the volute is subjected to the pressure of the internal high-pressure gas, it cannot be replaced by the asymmetrical volute on the opposite side. offset by the force; thus causing the radial force of the volute to be relatively uneven, thereby reducing the life and stability of the bearing and affecting the life and performance of the whole machine

At the same time, the gas in the volute is affected by the centrifugal force of the impeller, and the farther the distance from the center of the volute base circle is, the faster the gas velocity is and the higher the pressure is; and the diffusion section of the volute has only one outlet, which cannot separate the high-pressure gas and low-pressure gas inside the volute. Separated, resulting in turbulent gas flow at the outlet of the diffuser section of the volute, reducing the quality of the compressed gas

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