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Volute tongue and centrifugal fan comprising same

A technology of centrifugal fan and volute tongue, which is applied to parts of pumping devices for elastic fluids, mechanical equipment, machines/engines, etc. It can solve complex gas flow, air volume and static pressure drop, and great influence on fan performance, etc. problem, achieve the effect of improving fan performance and reducing noise

Pending Publication Date: 2018-07-03
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impact of the airflow at the outlet of the impeller on the volute tongue is relatively strong, and the gas flow near the volute tongue is relatively complicated and has a great impact on the performance of the fan
Studies have shown that when the radius of the front end of the volute tongue is appropriately reduced, the gap between the volute tongue and the impeller becomes smaller, the air volume and static pressure will increase, but the noise will also increase
When the radius of the front end of the volute tongue is appropriately increased, the gap between the volute tongue and the impeller will become larger, the rotation noise and eddy current noise of the fan will decrease, but at the same time the air volume and static pressure will decrease
[0003] Therefore, centrifugal fans generally compromise performance and noise and take an appropriate fixed value, but this fixed value is often effective for one working condition. For other working conditions of centrifugal fans, due to the change of the impeller speed triangle and the influence of the outlet environment Backflow can cause a significant drop in centrifugal fan performance
Therefore, people have designed a variable R volute tongue, even if the radius R of the front end of the volute tongue gradually changes from the front cover of the volute to the rear cover, the fillet of the volute tongue can be changed by simply changing the axial direction of R, and at the same time The gap between the volute tongue and the impeller can be changed to balance the performance of the fan, but this kind of volute tongue still cannot be adaptively adjusted according to the actual working conditions of the centrifugal fan, and further improvement is needed

Method used

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  • Volute tongue and centrifugal fan comprising same
  • Volute tongue and centrifugal fan comprising same
  • Volute tongue and centrifugal fan comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as Figure 1 to Figure 4 As shown, the volute tongue in this embodiment includes variable R cylinder 1 , upper support shaft 2 , lower support shaft 3 , flexible volute tongue wall 4 and motor 5 . Wherein, the upper supporting shaft 2 and the lower supporting shaft 3 are arranged at the root of the volute tongue, and the variable R cylinder 1 is arranged at the head of the volute tongue. The upper support shaft 2 is arranged on the front top of the lower support shaft 3, and the variable R cylinder 1 is arranged on the front and bottom of the lower support shaft 3, so that the upper support shaft 2, the lower support shaft 3 and the variable R cylinder 1 are triangularly distributed and each axes are parallel to each other.

[0030] The upper support shaft 2 constitutes the upper support body of the volute tongue, the lower support shaft 3 constitutes the lower support body of the volute tongue, the upper support shaft 2, the lower support shaft 3 and the variable...

Embodiment 2

[0036] Such as Figure 10 As shown, the upper support body of the volute tongue is the upper support bar 6, the lower support body is the lower support bar 7, the upper support bar 6 and the lower support bar 7 are parallel to each other and distributed along the axial direction of the variable R cylinder 1, flexible The rear end of the volute tongue wall 4 is fixed on the upper support bar 6 and the lower support bar 7 . When installing the volute tongue, the upper support bar 6 and the lower support bar 7 are all fixed on the ring wall 93 of the volute by screws 10, and the rear end of the flexible volute tongue wall 4 is clamped on the upper support bar 6 and the ring wall 93 and the lower support bar 6. Between the support bar 7 and the ring wall 93, the installation is very reliable.

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PUM

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Abstract

The invention discloses a volute tongue. The volute tongue is characterized by comprising a supporting frame and a flexible volute tongue wall forming the outer contour of the volute tongue; the supporting frame comprises an upper supporting body, a lower supporting body and a variable-R column body, the upper supporting body and the lower supporting body are arranged at the root of the volute tongue, and the variable-R column body is arranged at the head of the volute tongue; the upper supporting body, the lower supporting body and the variable-R column body are distributed in a triangle shape; the volute tongue further comprises a driving mechanism used for driving the variable-R column body to rotate. The invention further discloses a centrifugal fan comprising the volute tongue. The volute tongue has the advantages that the flexible volute tongue wall of the volute tongue is supported on the upper supporting body, the lower supporting body and the variable-R column body distributedin the triangle shape; the upper supporting body and the lower supporting body are arranged at the root of the volute tongue; the variable-R column body is arranged at the head of the volute tongue;the driving mechanism drives the variable-R column body to rotate and can achieve variable-R adjustment of the volute tongue so as to change the gap between the volute tongue and an impeller; accordingly, the performance of the draught fan is improved or noise is reduced, and the volute tongue can better adapt to various actual working conditions.

Description

technical field [0001] The invention relates to a centrifugal fan, in particular to a volute tongue and a centrifugal fan equipped with the volute tongue. Background technique [0002] The multi-blade centrifugal fan has the advantages of compact structure, high pressure coefficient, large flow coefficient and low noise, and is widely used in range hood products. The centrifugal fan is provided with a volute tongue near the outlet of the volute, and its function is to prevent part of the gas from circulating in the volute. The impact of the airflow at the outlet of the impeller on the volute tongue is relatively strong, and the gas flow near the volute tongue is relatively complicated and has a great impact on the performance of the fan. Studies have shown that when the radius of the front end of the volute tongue is appropriately reduced, the gap between the volute tongue and the impeller becomes smaller, the air volume and static pressure will increase, but the noise will...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/422F04D29/4233F04D29/663
Inventor 袁柯铭唐兴旺
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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