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Centrifugal blower vane designed based on load method

A centrifugal fan and load calculation technology, which is applied to the components, mechanical equipment, engine functions and other directions of the pumping device for elastic fluid, can solve the problems of difficulty in improving the fan, blindness of the blades, etc., and achieves the improvement of fan performance, Effects of stable static pressure growth and improved jet-wake structure

Active Publication Date: 2016-06-15
江苏考力特节能风机有限公司
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  • Application Information

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Problems solved by technology

Traditional design methods often rely on engineering experience, which makes it difficult to improve fan performance after reaching a certain level, and some blade improvement methods are often blind

Method used

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  • Centrifugal blower vane designed based on load method
  • Centrifugal blower vane designed based on load method
  • Centrifugal blower vane designed based on load method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] A centrifugal fan blade designed based on the load method, the load calculation formula used is:

[0038] δ=ρ·ω·Δω(1)

[0039] Among them, δ is the load; ρ is the fluid density in the flow direction, and since the research scope belongs to incompressible fluid, ρ is a constant value; ω is the average relative velocity of the fluid on the centerline of the blade passage, and Δω is the fluid density on the suction surface and the pressure surface Average relative velocity difference.

[0040] Since the average relative velocity of the blade path centerline is similar to the average relative velocity of the suction surface and the pressure surface, the formula (1) can be written as:

[0041] δ=ρ·S·ω 2 (2)

[0042] S = Δ ω ω = ...

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Abstract

The invention discloses a centrifugal blower vane designed based on a load method. A traditional design method for vane molded lines frequently depends on engineering experience, and blindness exists. According to the centrifugal blower vane, the load method is used for optimizing an original model vane and includes the steps that firstly, a proper average relative velocity curve is selected; then, multiple groups of load distribution functions are obtained by setting changes of loads at different positions; and afterwards, a vane molded line is determined according to load distribution. The performance of a blower can be improved through the obtained vane, a model with the middle load ratio being 0.7 is better in performance, especially under rated working conditions and small-flow working conditions, the efficiency under large-flow working conditions is gradually improved along with increasing of the load ratio, and the efficiency under the small-flow working conditions is reduced; flow in the optimized model is more stable than that in the original model, and no obvious flow separation and vortex exist; and in addition, due to the fact that no influence of separation exists, static pressure is stably increased in a vane channel, and a jet-wake structure at the position of an outlet of the vane channel is also improved.

Description

technical field [0001] The invention belongs to the field of fan equipment and relates to a centrifugal fan, in particular to a centrifugal fan blade designed based on a load method. Background technique [0002] As a kind of general machinery, centrifugal fans are widely used in industries such as iron and steel, cement, petroleum and petrochemical, and building ventilation. They are used in a huge amount and consume a lot of energy. Therefore, improving the efficiency of centrifugal fans can obtain very considerable economic and social benefits. [0003] The centrifugal impeller is the core component of the centrifugal fan. The loss in the centrifugal fan is also the main source of loss in the centrifugal fan. The flow at the outlet of the centrifugal impeller will also affect the flow of the air in the volute and the pipe. It can be seen that improving the efficiency of the impeller is the key to improving the efficiency of the centrifugal fan. The efficiency of the impe...

Claims

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Application Information

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IPC IPC(8): F04D29/30
CPCF04D29/30F05D2260/81
Inventor 窦华书李哲弘武林张滨炜周小颖刘琳
Owner 江苏考力特节能风机有限公司
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