CN220748619U

CN220748619U - Three cutting tongue structures of centrifugal fan spiral case

Info

Publication number: CN220748619U
Application number: CN202321868212.2U
Authority: CN
Inventors: 王力; 周斌; 祁忠祥; 王志强; 谢冰
Original assignee: Zhejiang Jindun Fans Holding Co ltd
Current assignee: Zhejiang Jindun Fans Holding Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2024-04-09
Anticipated expiration: 2033-07-17

Abstract

The utility model relates to the field of fans, in particular to a centrifugal fan volute three-cutting-tongue structure. The utility model discloses a centrifugal fan volute three-cutting-tongue structure which comprises a volute casing, wherein the volute casing comprises volute tongues, and symmetrical volute tongues and parallel volute tongues are arranged in the volute tongues. The utility model aims to add a cutting tongue to a volute so as to enable the volute to have a better noise-reducing and vibration-reducing structure, and the integral rigidity of the volute is increased by arranging symmetrical cutting tongues and parallel cutting tongues in the volute. By adding the cutting tongue and reducing the arrangement of external ribs, the aim of reducing the weight and the cost can be achieved. Meanwhile, the increase of the volute tongue can effectively reduce noise generated by resonance of the shell.

Description

Three cutting tongue structures of centrifugal fan spiral case

Technical Field

The utility model relates to the field of fans, in particular to a centrifugal fan volute three-cutting-tongue structure.

Background

The outlet of the volute of the centrifugal fan is provided with a tongue-shaped structure, which is commonly called a volute tongue, and the volute tongue is used for: 1. the gas can be prevented from circulating in the shell; 2. the clearance between the upper surface of the volute tongue and the outer diameter of the impeller has a larger influence on noise. The gap is small, and the noise is large; otherwise, the gap is large, and the noise is reduced; 3. the circular arc on the volute tongue has little great influence on the aerodynamic performance of the fan, but has great influence on noise, the radius of the circular arc is small, and the noise is relatively large.

The volute is a short for the volute type water diversion chamber, and the appearance of the volute is similar to that of a snail shell, so the volute is generally short for volute. The inner space of the volute of the centrifugal fan is relatively open, and when the fan impeller rotates, the wall thickness of the volute is limited by weight to be thinner, so that resonance with the rotating impeller can occur due to insufficient rigidity, noise is generated, and the strength is reduced.

Disclosure of Invention

The utility model hopefully provides a centrifugal fan volute casing three-cutting-tongue structure, which comprises the following specific schemes:

the three-cutting tongue structure of the centrifugal fan volute comprises a volute casing, wherein the volute casing comprises volute tongues, and symmetrical volute tongues and parallel volute tongues are arranged in the volute tongues.

The volute includes a volute outer contour, and the symmetrical volute tongue is parallel to the volute outer contour.

The parallel volute tongue is arranged at an angle of 20-25 degrees, preferably 21.5 degrees, to the outlet direction. The design can ensure that the flow field is smooth and is not influenced by the newly added cutting tongue.

The utility model aims to add a cutting tongue to a volute so as to enable the volute to have a better noise-reducing and vibration-reducing structure, and the integral rigidity of the volute is increased by arranging symmetrical cutting tongues and parallel cutting tongues in the volute. By adding the cutting tongue and reducing the arrangement of external ribs, the aim of reducing the weight and the cost can be achieved. Meanwhile, the increase of the volute tongue can effectively reduce noise generated by resonance of the shell.

Drawings

FIG. 1 is a schematic diagram of a three-blade structure of a centrifugal fan volute;

FIG. 2 is a schematic diagram II of a three-blade structure of a centrifugal fan volute;

FIG. 3 is a schematic diagram of stress distribution of a three-tab structure of a centrifugal fan volute;

FIG. 4 is a diagram showing the distribution of deformation of a three-blade structure of a centrifugal fan volute;

FIG. 5 is a schematic diagram of a prior art single-tab volute;

FIG. 6 is a schematic diagram of a prior art single-tab volute;

FIG. 7 is a schematic diagram of stress distribution of a prior art single-tab volute;

FIG. 8 is a schematic diagram of the deflection profile of a prior art single-tab volute;

1. a volute; 11. a volute outer contour; 12. a volute tongue; 13. symmetrical volute tongues; 14. parallel volute tongue.

Detailed Description

Further description is provided below in connection with fig. 1-8:

the three-cutting tongue structure of the centrifugal fan volute comprises a volute casing 1, wherein the volute casing 1 comprises a volute tongue 12, and a symmetrical volute tongue 13 and a parallel volute tongue 14 are arranged in the volute tongue 12.

The volute 1 comprises a volute outer contour 11, and the symmetrical volute tongue 13 is parallel to the volute outer contour 11.

The arrangement direction of the parallel volute tongue 14 is 21.5 degrees with the outlet direction (the arrangement direction is consistent with the streamline direction, so that the smoothness of the flow field is ensured not to be influenced by a newly added cutting tongue). The design can ensure that the flow field is smooth and is not influenced by the newly added cutting tongue.

As shown in fig. 3,4,7 and 8, by comparing the single-throw and three-throw volute configurations, it is possible to obtain, with the same stainless steel material: after the symmetrical cutting tongues and the parallel cutting tongues are added to the volute, the maximum stress of the side face of the volute is reduced from 1.3059MPa to 0.3638MPa, and the maximum deformation is reduced from 0.0143mm to 0.0024mm, so that the volute with three cutting tongues can better meet the use requirement. Through verification and calculation, the influence on the overall performance of the centrifugal fan with the cutting tongue is small.

The foregoing is merely a preferred embodiment of the utility model, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the principles of the utility model, and such modifications and improvements should also be considered as being within the scope of the utility model.

Claims

1. The utility model provides a centrifugal fan spiral case three cut tongue structures which characterized in that: the spiral case comprises a spiral case body, wherein the spiral case body comprises a spiral tongue, and symmetrical spiral tongues and parallel spiral tongues are arranged in the spiral tongue; the volute comprises a volute outer contour line, and the symmetrical volute tongue is parallel to the volute outer contour line; the arrangement direction of the parallel volute tongues is 20-25 degrees with the outlet direction.