Volute tongue of fan

A volute tongue and fan technology, applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems that the air volume and pressure of the fan cannot be effectively improved, and the noise increases, so as to reduce the backflow gas, enhance the gas circulation, and improve the The effect of air volume and air pressure

Pending Publication Date: 2019-08-02
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the improvement of fan volute tongue structure is mainly considered from the angles of reducing fan noise and eliminating vortex, such as the Chinese invention patent application with application number 201210210890. Volute case, volute tongue", the volute tongue includes an inner concave surface, and the inner concave surface is a smooth curved surface, so that the airflow at the volute tongue is smoother, which is conducive to reducing noise. There is a local deceleration in the middle, which is beneficial to reduce noise, but because the upper connecting surface of the volute tongue is a plane, the front and rear airflows on both sides of the volute tongue go out normally, and because the middle airflow velocity is high, the middle airflow and the front and rear airflow are almost at the same time. The connection surface impacts, resulting in increased noise superposition, and the volute tongue is not considered from the perspective of enhancing the gas circulation, which cannot effectively increase the air volume and air pressure of the fan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 1 to Figure 2 As shown, taking the direction indicated by the arrow A as the forward direction, the fan volute tongue in this embodiment includes a volute tongue body 1, and the tongue tip of the volute tongue body 1 is provided with an installation groove 11, and the installation groove 11 is along the volute tongue body 1. Distributed in the length direction, a rotating column 2 is installed in the mounting groove 11, and the two ends of the rotating column 2 have an outwardly extending mounting shaft 21, wherein the mounting shaft 21 at one end is installed on the front wall 12 of the mounting groove 11, and the mounting shaft 21 at the other end The installation shaft 21 is installed on the rear wall 13 of the installation groove 11, and the motor 3 is installed on the front wall 12 of the installation groove 11. The output shaft of the motor 3 passes through the front wall 12 of the installation groove 11 and is installed with the corresponding beari...

Embodiment 2

[0034] Such as Figure 6 and Figure 7 As shown, the surface of the middle section of the rotary column 2 is covered with pits 22 . The depth of the pit 22 is 0.2mm-0.5mm. Moreover, the density of the dimples 22 is the largest near the centerline of the rotating column 2, and gradually becomes smaller toward the front and rear ends. After the dimples 22 are provided on the rotating column 2, the friction between the rotating column 2 and the air can be increased, the gas circulation can be further enhanced, the deflection of the gas can be more obvious, and the air volume and air pressure can be further increased. The rest of the structure is the same as that of Embodiment 1, and will not be further described here.

Embodiment 3

[0036] Such as Figure 8 As shown, the dimples 22 are arranged at the front and rear ends of the rotating column 2, so as to enhance the fluid velocity at the front and rear sides of the volute tongue.

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Abstract

The invention discloses a volute tongue of a fan. The volute tongue comprises a volute tongue body and is characterized in that an installation groove is formed in the tongue tip part of the volute tongue body, the installation groove is distributed in the length direction of the volute tongue body, a rotating column is installed in the installation groove, the two ends of the rotating column areinstalled on the front wall and the rear wall of the installation groove correspondingly, and a driving piece for driving the rotating column to rotate is installed on the front wall or the rear wallof the installation groove. The volute tongue has the advantages that by installing the rotating column which can rotate relative to the volute tongue body on the tongue tip part of the volute tonguebody, gas circulation can be generated on the tongue tip part of the volute tongue on the basis of the Magnus effect, so that partial air flow colliding with the tongue tip part of the volute tongue is deflected towards an air outlet, backflow gas is reduced, and then wind volume and wind pressure are improved; and in addition, by arranging pits in the surface of the rotating column, the gas circulation can be further enhanced, and then the wind volume and the wind pressure are further improved.

Description

technical field [0001] The invention relates to a fan volute tongue. Background technique [0002] Multi-blade centrifugal fans are widely used in range hoods due to their advantages of compact structure, high pressure coefficient, large flow coefficient and low noise. The centrifugal fan of the existing range hood is provided with a volute near the outlet of the volute, and the function of the volute is to prevent part of the gas from circulating in the volute. It is found through experiments that 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 more complicated and has a greater impact on the performance of the fan. In addition, the rotation of an object in the air can drive the surrounding fluid to rotate, and the circulation generated by the rotation interacts with the fluid, so that the fluid velocity on one side of the object increases and the fluid velocity on the other side ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/422F04D29/667
Inventor 袁柯铭唐兴旺
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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