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Volute-free centrifugal fan with arc pillars

A centrifugal fan without a volute, which is applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc. It can solve the problems of no conversion of kinetic energy at the outlet of the impeller, low static pressure efficiency, loss, etc., and achieve small cutting movement resistance , smooth cutting and significant static pressure gain

Active Publication Date: 2015-05-13
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the volute-less fan does not have a volute, the kinetic energy at the outlet of the impeller is not converted into static pressure. When the airflow rushes out of the impeller, the kinetic energy is completely lost, resulting in the common defect of low static pressure efficiency of the volute-free centrifugal fan.

Method used

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  • Volute-free centrifugal fan with arc pillars
  • Volute-free centrifugal fan with arc pillars
  • Volute-free centrifugal fan with arc pillars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: if Figure 1~4 As shown, this embodiment includes a rotating shaft (not shown), and a wheel disc 1 and a wheel cover 2 that are positioned on the rotating shaft and cooperate with each other. The wheel cover 2 is an arc-shaped wheel cover. Six blades 3 are installed, and the blades 3 are backward airfoil blades, and an outlet diffuser edge is arranged between the blades 3 and the disc 1 . An arc pillar 4 is also installed between any two adjacent blades 3, and the arc pillar 4 is a strip arc, and one end of the arc pillar 4 is fixed with the blade surface of the previous blade, and the other end is connected with the rear blade. The blade surfaces of the blades are fixed; the arc-shaped pillars 4 are located on the same plane, and the plane is perpendicular to the rotation axis. Wherein, the outlet installation angle of the arc-shaped pillar 4 is 168°.

[0023] Through the CFX fluid dynamics simulation software, the flow rate of this embodiment is 9372...

Embodiment 2

[0024] Embodiment 2: The only difference from Embodiment 1 is that the outlet installation angle of the arc-shaped support 4 is 160°.

[0025] Through the CFX fluid dynamics simulation software, this embodiment obtains the optimal static pressure efficiency of 64.35% when the flow rate is 9372.39m3 / h and the static pressure is 753.26Pa.

Embodiment 3

[0026] Embodiment 3: The only difference from Embodiment 1 is that the outlet installation angle of the arc-shaped support 4 is 172°.

[0027] Through the CFX fluid dynamics simulation software, in this embodiment, when the flow rate is 9372.53m3 / h and the static pressure is 758.18Pa, the optimal static pressure efficiency is 64.19%.

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Abstract

The invention discloses a volute-free centrifugal fan with arc pillars. The volute-free centrifugal fan with the arc pillars comprises a rotating shaft, and a wheel disc located on the rotating shaft and a wheel cover, wherein blades are installed between the wheel disc and the wheel cover, the blades are backward airfoil blades, the arc pillars are located between two adjacent blades, one end of each arc pillar is fixed to the blade surface of a former blade, and the other end is fixed to the blade surface of a latter blade; the outlet installation angles of the arc pillars are 160-172 degrees; the arc pillars are in the same plane, and the plane is perpendicular to the rotating shaft. According to the volute-free centrifugal fan with the arc pillars, on the premise that power consumption does not change, compared with a volute-free centrifugal fan without the arc pillars, the rated condition efficiency of the volute-free centrifugal fan with the arc pillars increases by 5%, especially for medium and large type volute-free centrifugal fans, and economic benefits brought by the volute-free centrifugal fan with the arc pillars are extremely prominent.

Description

technical field [0001] The invention relates to a centrifugal fan without a volute, in particular to a centrifugal fan without a volute with arc-shaped pillars. Background technique [0002] At present, the volute-free centrifugal fan is also called the volute-free fan. It has the advantages of large air volume, high pressure, low noise, and compact structure. It can meet customers' higher requirements for noise, energy saving and space layout, and is widely used in Industrial and mining enterprises, high-end hotels, office buildings, theaters, high-end commercial and residential buildings, shopping malls, hospitals and other buildings for pressure air ventilation, especially in energy-saving renovation projects, centrifugal fans without volutes have gradually replaced centrifugal fans with volutes. fan. In addition, since the volute-less fan has no volute, in the total pressure at the outlet of the volute-less fan to the impeller, the proportion of its dynamic pressure com...

Claims

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Application Information

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IPC IPC(8): F04D29/28
CPCF04D29/281F04D29/30
Inventor 魏义坤徐金秋窦华书杨徽陈永宁姜陈锋吴阳周晓颖何海江
Owner ZHEJIANG SCI-TECH UNIV
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