Low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines

A Bessel medium and twisted blade technology, applied in the field of axial flow fan impeller, can solve the problems of increasing design difficulty and achieve the effect of meeting the cooling and ventilation requirements and compact structure

Inactive Publication Date: 2013-11-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the cooling fan of the locomotive traction system must not only have the characteristics of compact structure, but also meet the strict cooling and ventilation requirements, which greatly increases the difficulty of design

Method used

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  • Low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines
  • Low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines
  • Low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines

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Embodiment 1

[0024] The invention provides a novel axial-flow impeller with low speed and high pressure than Bessel mid-arc with stronger twisted blades, the diameter of the hub is 525-535mm, and the height of the blade is 230-238mm; 9-11 pieces of Bessel mid-arc are used to change the cross-section The blades are strongly twisted and evenly distributed along the circumference. The blades and the hub are designed with integral casting, and the surface is smoothed to ensure surface roughness; the axial length of the blades is longer, 220-230mm, which increases the blade's rigidity in a limited space. The chord length of the blade root is 285-290mm, and the chord length of the blade top is 318-322mm, which increases the effective work area of ​​the blade and thus achieves a relatively high pressure ratio at low speed; No overlap, the blade root adopts a larger installation angle of 49-53°; the degree of reaction increases along the blade height direction, making full use of the working abilit...

Embodiment 2

[0026] Such as Figure 2-Figure 4 As shown, the novel low-speed high-pressure ratio Bessel axial flow impeller with strong twisted blades in the middle arc of the present invention. The diameter of the hub is 265mm, and the outer diameter of the impeller is 500mm. It adopts 10 pieces of Bessel medium-arc variable cross-section strongly twisted blades and distributes them evenly along the circumference. The blades and the hub adopt an integral casting design, and the surface is smoothed to ensure surface roughness; Figure 4 Sectional line 1 of the middle blade root, section line 2 of the blade at 0.5 blade height, and section line 3 of the blade top are optimized section lines of blades at various heights; in order to meet the casting process and strength requirements, the connection between the blade and the hub is rounded Angle, rounding radius 13mm; blade axial length 223.55mm, blade root chord length 286.8mm, blade top chord length 319.5mm, blade root installation angle is...

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Abstract

The invention belongs to the technical field of fans and particularly relates to an axial-flow ventilator impeller, namely a low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines. The impeller comprises a hub and blades and is characterized in that a camber line of blade profile of each blade is a three-point-based quadratic trigonometric curve, the blades do not overlap at the root, and the mounting angle of the root of each blade is 49-53 DEG. Through redesigned camber lines, which are three-point-based quadratic trigonometric curves, for the blades and through the designed mounting angle and the ratio of blade tip chord length to blade root chord length, high static pressure rise is provided in limited small space, and accordingly the impeller is compact in structure and satisfactory to cooling and ventilation.

Description

technical field [0001] The invention belongs to the technical field of fans, in particular to an impeller of an axial flow fan. Background technique [0002] Domestic locomotives are becoming high-speed and heavy-duty, which increases the heat generated by the power equipment in the locomotive. In order to ensure the safety of locomotives, the requirements for the forced convection ventilation system of the heating components in the locomotive are constantly increasing. At present, the core components of its cooling system - cooling fans, mostly rely on imports. However, the high cost of imported fans, long procurement cycle, and inconvenient maintenance make the localization of cooling fans for locomotives an urgent problem to be solved. The locomotive traction system has the characteristics of high power and many heating elements, which require the cooling fan to have a high static pressure rise; at the same time, due to the limited space of the locomotive carriage, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/34F04D29/38F04D25/08F04D19/00
Inventor 王晓放罗艾然徐胜利杨晓清吴联军姜治迅
Owner DALIAN UNIV OF TECH
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