Pneumatic impeller

Abstract

The invention belongs to the field of impellers, and discloses a pneumatic impeller which comprises a blade, the blade is provided with a blade basin surface and a blade back surface which are in arc connection, the blade back surface is provided with a front edge part and a flow guide part which are in arc connection, the curvature radius of the blade basin surface is 70%-90% of that of the flow guide part, and the curvature radius of the front edge part is 4.3%-5.5% of that of the flow guide part. The surface of the blade basin surface is provided with a first preset point, the surface of the flow guide part is provided with a second preset point, the first preset point and the second preset point are both located on the same cross section of the hub and are both located on a circumference with the center of the hub as the circle center, and a straight line which passes through the first preset point and is tangent to the surface of the blade basin surface serves as a first tangent line; a straight line passing through the center of the hub and the first preset point serves as a reference line, a straight line passing through the second preset point and tangent to the surface of the flow guide part serves as a second tangent line, the acute angle formed by the first tangent line and the second tangent line ranges from 6 degrees to 8 degrees, and the acute angle formed by the first tangent line and the reference line ranges from 30 degrees to 33 degrees.

Description

technical field [0001] The invention belongs to the field of impellers, in particular to a pneumatic impeller. Background technique [0002] The low-voltage start-up differential pressure power generation technology is a key new technology to solve the problem of low cost, safety, convenience and self-power supply of natural gas pressure regulating stations in cities and remote areas. [0003] Its implementation is specifically to drive the aerodynamic impeller to rotate through the external airflow, and then the rotating aerodynamic impeller provides sufficient torque for the generator, so that the generator can effectively output power to the outside. [0004] But at present, the pressure difference condition of this implementation must be greater than or equal to 0.4MPa, otherwise it cannot provide sufficient torque for the generator, so that the generator cannot effectively output power, and this 0.4MPa limitation has troubled the industry for a long time , so that a la...

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Problems solved by technology

[0004] But at present, the pressure difference condition of this implementation must be greater than or equal to 0.4MPa, otherwise it cannot provide sufficient torque for the generator, so that the generator cannot effectively output power, and this 0.4MPa limitation has troubled the industry for a long time , so that a large number of low-pressure natural gas pressure regulating stations cannot realize self-power supply

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