Large-air-volume high-pressure-head centrifugal fan

Abstract

The invention belongs to the technical field of centrifugal fans, and in particular relates to a centrifugal fan with a large air volume and a high pressure head, which can generate a large air volume and a high pressure head in a compact space. It includes: a wheel cover, a wheel disc and a blade; the wheel cover, the wheel disc and the blade form a closed fan impeller, the maximum outer diameter D2 of the fan / the axial length L of the fan is between 2.7 and 3.2; the diameter of the wheel hub D0 / fan inlet Diameter D1<0.15; fan inlet diameter D1 / fan maximum outer diameter D2>0.8; rated working speed>4000r / min. Compared with the prior art, in order to meet the special requirements of high power density power devices for cooling fans, the present invention provides a flat centrifugal fan with large air volume and high pressure head, which can solve the air flow problem of strengthening heat dissipation in a compact space. .

Description

technical field [0001] The invention belongs to the technical field of centrifugal fans, and in particular relates to a centrifugal fan with a large air volume and high pressure head, which can generate a large air volume and high pressure head in a compact space structure. Background technique [0002] As the power density of the engine represented by the water-cooled diesel engine continues to increase, higher requirements are put forward for the cooling system that matches it. Only when the cooling fan has higher aerodynamic performance and a more compact structure can it be used within a limited range. At the expense of effective power consumption in a small space, forced convection air is generated to meet the heat dissipation requirements of the cooling system. [0003] At present, in high power density propulsion devices, the L-shaped air duct is a typical aerodynamic layout, and the cooling air turns 90° from the inlet to the outlet, which enables the radiator, cooli...

AI Technical Summary

Problems solved by technology

For this kind of aerodynamic layout, the centrifugal fan is undoubtedly the best solution, but the conventional centrifugal fan is difficult to meet the comprehensive requirements of the system for fan space adaptability, aerodynamic performance and reliability. The axial dimension of the fan must be strictly restricted. Second, in order to meet higher heat dissipation requirements, the fan must have the aerodynamic performance of a large air volume and high pressure head. Third, the complex flow characteristics in a narrow space require the fan to have better anti-distortion capabilities.

Images