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Volute with inward concave inclined volute tongue structure

A concave and volute tongue technology is applied to non-variable pumps, parts of pumping devices for elastic fluids, pump components, etc., which can solve the problem of not considering the volute tongue gap and volute tongue radius distribution law It can take into account the non-uniform flow field inside the volute and impeller, etc.

Active Publication Date: 2019-07-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above measures failed to take into account the non-uniformity of the flow field inside the volute and impeller in the axial direction, and did not consider the distribution of the volute tongue gap and volute tongue radius in the axial direction

Method used

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  • Volute with inward concave inclined volute tongue structure
  • Volute with inward concave inclined volute tongue structure
  • Volute with inward concave inclined volute tongue structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Import the 5 volute tongue section profiles obtained from the first part and the second part of the volute tongue into the three-dimensional drawing software, and the obtained front view and side view of the volute tongue replacement part are as follows Figure 7 As shown in the figure, rounding is performed at the tip corner of the cochlear tongue, where the radiuses of the rounding corners at position e and position f are 6mm and 8mm respectively (chamfering can make the surface of the cochlear tongue smoother without affecting the relationship between r and t value).

Embodiment 2

[0064] Example 2: Under different working conditions of the fan, the tip of the volute tongue structure in Example 1 may cause the noise to increase and the sound quality of the fan to decrease. On the basis of Example 1, the two parts of the volute tongue are discarded. Have the section S3, only select the corresponding S1 and S2 sections of each part (that is, only select the S1, S2 sections of the first part, the S4, S5 sections of the second part), draw the volute tongue entity according to the same steps as in Example 1 ( At this time, the change relationship between the S2 section and the S4 section is a linear relationship), and the front view and side view of the volute tongue replacement part are as follows: Figure 8 shown. Compared to Example 1, the flow is smoother without the tip due to the S3 section.

[0065] It can be seen from the appearance of the two embodiments that the volute tongue has a concave structure, and its concave law is determined by the distanc...

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Abstract

The invention discloses a volute with an inward concave inclined volute tongue structure. According to the volute, an inward concave inclined volute tongue comprises a first part and a second part inthe axial direction by taking a plane of an impeller disc as a boundary; in the first part, for any section perpendicular to the axial direction, the radius of a volute tongue profile and the volute tongue clearance on the section generally conform to a quadratic function relation of the section position to change accordingly; and in the second part, for any section perpendicular to the axial direction, the radius of a volute tongue profile and the volute tongue clearance on the section also generally conform to a quadratic function relation of the section position to change accordingly. According to the volute with the inward concave inclined volute tongue structure, the appearance structure of the volute tongue, especially the distribution of the volute tongue radius and the volute tongue clearance corresponding to the volute tongue sectional profile in the axial direction, are improved, so that the inward concave inclined volute tongue structure and an application method thereof areapplied to the volute, improve the efficiency of a fan, reduce the noise of the fan and obviously improve the pneumatic performance of the fan.

Description

technical field [0001] The invention belongs to the field of fans, and more specifically relates to a volute with a concave inclined volute tongue structure, especially a multi-blade centrifugal fan volute with a concave inclined volute tongue structure. Background technique [0002] In the multi-blade centrifugal fan, in order to meet the pressure requirements, the forward or even strong forward impeller is generally selected. The large number of blades leads to a large consistency, which makes the distribution of the impeller wake flow field complex, and the non-uniform structure of the volute along the circumferential direction It will exacerbate the non-uniformity of the flow inside the impeller. Reasonable volute tongue structure and the gap between volute tongue and impeller can ease the flow separation between impeller and volute, reduce flow loss, and reduce the dynamic and static interference between volute and impeller at the volute tongue, which is indispensable f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/422F04D29/4226F04D29/663F04D29/667
Inventor 王军肖千豪蒋博彦丁炎炎彭勇凌杰达
Owner HUAZHONG UNIV OF SCI & TECH
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