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Locally-protruding wave-shaped blade, centrifugal impeller and centrifugal fan

A centrifugal fan, partially raised technology, applied in the direction of mechanical equipment, machine/engine, liquid fuel engine, etc., can solve the problem of reducing the working efficiency and working power of the impeller on the gas, reducing the effective flow cross-sectional area of ​​the blade channel, Main airflow interference and other issues

Pending Publication Date: 2022-02-25
浙江科贸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the viscosity of the gas medium, a boundary layer will be generated when flowing in the blade passage. Although its thickness is small, it has a great influence on the flow state. The friction force when the gas flows is generated in the boundary layer; the existence of the boundary layer makes the blade passage The effective flow cross-sectional area decreases, so the velocity of the main airflow increases slightly, which interferes with the main airflow. More importantly, the viscosity and boundary layer continue to develop, and the gas in the impeller channel is close to the blade working surface due to viscosity. At the wall surface, the boundary layer may separate from the wall surface, forming a certain vortex area and expanding, causing a large loss, thereby reducing the work efficiency and work ability of the impeller to the gas

Method used

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  • Locally-protruding wave-shaped blade, centrifugal impeller and centrifugal fan
  • Locally-protruding wave-shaped blade, centrifugal impeller and centrifugal fan
  • Locally-protruding wave-shaped blade, centrifugal impeller and centrifugal fan

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Effect test

Embodiment 1

[0032] refer to Figure 3-5 , a partially protruding wavy blade, a centrifugal impeller and a centrifugal fan, comprising a plurality of blades 1, a front disc 2 and a rear disc 3, and a plurality of vanes 1 are located between the front disc 2 and the rear disc 3, the working of the blades 1 Wave-shaped protrusions 101 are arranged on the surface along the arc length of the blade 1 .

[0033] In this embodiment, the blade 1 is in the shape of an arc of equal thickness, with a radius of R (or a compound arc shape combining multiple arcs), and a thickness of t=2.5 mm.

[0034] In this embodiment, the inlet diameter of the blade 1 is D 1 =159 mm, the outlet diameter of blade 1 is D 2 =263 mm.

[0035] In this embodiment, the blade 1 inlet installation angle β 1A =17.5°, the outlet installation angle of blade 1 is β 2A =30°.

[0036] In this embodiment, the entrance width of the channel between two adjacent blades 1 is W—that is, along the direction of impeller rotation, th...

Embodiment 2

[0045] refer to Figure 3-5 , a partially protruding wavy blade, a centrifugal impeller and a centrifugal fan, comprising a plurality of blades 1, a front disc 2 and a rear disc 3, and a plurality of vanes 1 are located between the front disc 2 and the rear disc 3, the working of the blades 1 Wave-shaped protrusions 101 are arranged on the surface along the arc length of the blade 1 .

[0046] In this embodiment, the blade 1 is in the shape of an arc of equal thickness, with a radius of R (or a compound arc shape combining multiple arcs), and a thickness of t=2.5 mm.

[0047] In this embodiment, the inlet diameter of the blade 1 is D 1=318 mm, blade 1 outlet diameter is D 2 =526 mm.

[0048] In this embodiment, the blade 1 inlet installation angle β 1A =17.5°, the outlet installation angle of blade 1 is β 2A =30°.

[0049] In this embodiment, the entrance width of the channel between two adjacent blades 1 is W—that is, along the direction of impeller rotation, the inner ...

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Abstract

The invention belongs to the field of ventilators, particularly relates to a locally-raised wave-shaped blade, a centrifugal impeller and a centrifugal fan, and aims to solve the problems that a boundary layer is possibly separated from a wall surface and separated at the position close to the wall surface of a working surface of the blade due to viscosity of gas in an impeller passage, a certain vortex region is formed and expanded, large loss is caused, and work efficiency and capacity of the impeller to gas are reduced; According to the technical scheme, the impeller comprises a plurality of blades, a front disc and a rear disc, wherein the blades are located between the front disc and the rear disc, and wavy protrusions are arranged on the working faces of the blades along the arc lengths of the blades. The key lies in that a series of locally-protruding waves are arranged for boundary layer separation in flow channels between blades of the closed impeller of the backward centrifugal fan, so that the separation degree of the boundary layers in the blade channels is restrained, losses in the blade channels are reduced, and the working efficiency and the working capacity of the impeller on airflow are improved.

Description

technical field [0001] The invention relates to the technical field of ventilators, in particular to a partially raised wavy blade, a centrifugal impeller and a centrifugal ventilator. Background technique [0002] Usually, the impeller of the backward centrifugal fan is mostly a closed impeller, which mainly includes a rear disk, a front disk and several blades arranged in between, and the inner hole of the front disk is the impeller inlet, such as figure 1 shown. [0003] The blade flow channel of the closed impeller is the channel surrounded by the adjacent blades, the front disk of the impeller and the rear disk of the impeller. The diameter of the inlet and outlet of the blade, the shape of the blade, the installation position and the number of blades determine the shape of the blade passage; [0004] In the closed centrifugal impeller, since the number of blades is not infinite but a certain number of finite blades, the velocity distribution along the circumferential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F04D29/68
CPCF04D29/30F04D29/681
Inventor 裘鑫徐天赐
Owner 浙江科贸实业有限公司