CN214465105U

CN214465105U - High-efficiency low-noise centrifugal fan

Info

Publication number: CN214465105U
Application number: CN202022509607.6U
Authority: CN
Inventors: 罗伟乐; 刘阳明; 王汉波; 叶涛; 覃万翔; 梁燕好
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-10-22
Anticipated expiration: 2030-11-03

Abstract

The utility model discloses a high-efficiency low-noise centrifugal fan, which comprises an annular wheel cover at the upper side and a fan wheel disc at the lower side, wherein blades are arranged between the annular wheel cover and the fan wheel disc; the blade comprises a front edge area and a tail edge area, the front edge area is of an M-shaped structure, the front edge area sequentially comprises a first arc line, a second oblique straight line, a third arc line and a fourth oblique straight line from top to bottom, a first point convex tip is formed between the first arc line and the second oblique straight line, a second point concave end is formed between the second oblique straight line and the third arc line, and a third point convex tip is formed between the third arc line and the fourth oblique straight line; the M-shaped design of the front edge area is adopted by the blades, so that the influence of horseshoe vortex and low-speed vortex during the work of the centrifugal fan can be well eliminated, and the work efficiency of the centrifugal fan is improved.

Description

High-efficiency low-noise centrifugal fan

Technical Field

The utility model relates to a centrifugal fan technical field, especially a centrifugal fan of more high-efficient low noise.

Background

When the centrifugal fan works, complex flow is easy to occur. When the fluid flows across the surface of the blade, the fluid is obstructed by the blade, the flow velocity is reduced, a counter pressure gradient with large downstream pressure and small upstream pressure is generated, and when the counter pressure gradient is large to a certain degree, the original movement of the fluid is stopped and moves upstream (in the opposite direction) under the action of the counter pressure gradient, so that a horseshoe vortex is formed on the surface of the blade. The presence of horseshoe vortices increases the aerodynamic noise of the fan and also reduces the work capacity of the fan. In addition, due to the characteristic of the fluid moving in the backward centrifugal blade path, low-speed vortex often appears at the back pressure surface of the tail edge of the blade at the outlet of the blade path, and the working efficiency of the centrifugal fan is also influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a centrifugal fan with high efficiency and low noise.

The utility model provides a technical scheme that its technical problem adopted is: the centrifugal fan comprises an annular wheel cover on the upper side and a fan wheel disc on the lower side, wherein blades are arranged between the annular wheel cover and the fan wheel disc; the blade comprises a front edge area and a tail edge area, wherein the front edge area is of an M-shaped structure, the front edge area sequentially comprises a first section of arc line M1, a second section of inclined straight line M2, a third section of arc line M3 and a fourth section of inclined straight line M4 from top to bottom, a first point convex tip a1 is formed between the first section of arc line M1 and the second section of inclined straight line M2, a second point concave tip a2 is formed between the second section of inclined straight line M2 and the third section of arc line M3, and a third point convex tip a3 is formed between the third section of arc line M3 and the fourth section of inclined straight line M4.

According to the utility model provides a centrifugal fan adopts the regional M font design of leading edge through the blade, can clear up the influence of centrifugal fan during operation horseshoe whirlpool and low-speed whirlpool well, improves centrifugal fan's work efficiency.

As some preferred embodiments of the utility model, first section pitch arc m1 the oblique straight line m2 of second section the third section pitch arc m3, length m1 |, | m2 |, | m3 |, | m4 | -the value of length of the oblique straight line m4 of fourth section satisfies, | m1 | > | m3 |, | m2 | > | m4 |.

As some preferred embodiments of the present invention, the upper end of the tail edge region faces the fan wheel disc circle center direction to form a tail edge bending portion, and the lower side of the tail edge region is recessed to form a C-shaped structure.

As some preferred embodiments of the present invention, the meridian section of the blade is an M-shaped structure.

As some preferred embodiments of the utility model, the blade upper end is wheel cap department leaf type line n1, the blade lower extreme is wheel disc department leaf type line n2, wheel cap department leaf type line n1 wheel disc department leaf type line n 2's length | n1 |, | n2 | the value satisfies, | n1 | > | n2 |, wheel cap department leaf type line n1 wheel disc department leaf type line n 2's horizontal extending direction staggers and forms X font structure.

The utility model has the advantages that: the novel structure aims at the problem that horseshoe vortex and low-speed vortex are easily generated when the centrifugal fan rotates, and by means of improvement of the blade structure, the horseshoe vortex and the low-speed vortex around the blades can be effectively reduced, pneumatic noise of the centrifugal fan is reduced, and work efficiency of the centrifugal fan is improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of a blade of the present invention;

FIG. 3 is a front view of a blade of the present invention;

FIG. 4 is a top view of a blade of the present invention;

fig. 5 is a left side view of the blade of the present invention.

Reference numerals:

annular shroud 100, fan disk 200, blades 300, leading edge region 310, trailing edge region 320, trailing edge bend 321.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention can be practiced without these specific details, i.e., those skilled in the art can more effectively describe the nature of their work to others skilled in the art using the description and illustrations herein. Furthermore, it should be noted that the terms "front side", "rear side", "left side", "right side", "upper side", "lower side", and the like used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a specific part, respectively, and those skilled in the art should not understand that the technology beyond the scope of the present application is simply and innovatively adjustable in the directions. It should be understood that the specific embodiments described herein are merely illustrative of the present application and do not limit the scope of the actual protection. Well-known manufacturing methods, control procedures, component dimensions, material compositions, pipe arrangements, etc., have not been described in detail since they are readily understood by those of ordinary skill in the art, in order to avoid obscuring the present invention.

Fig. 1 is a perspective view of an embodiment of the present invention, and referring to fig. 1, an embodiment of the present invention provides a centrifugal fan with high efficiency and low noise, which includes an annular wheel cover 100 on an upper side and a fan wheel 200 on a lower side, and blades 300 are disposed between the annular wheel cover 100 and the fan wheel 200. The blade 300 includes a leading edge region 310 and a trailing edge region 320, and when the centrifugal fan is rotating, wind flow generally flows from the leading edge region 310 into the blade channel and then from the trailing edge region 320.

Referring to fig. 2, 3, 4 and 5, the front edge region 310 is an M-shaped structure, the front edge region 310 sequentially includes, from top to bottom, a first arc line M1, a second oblique straight line M2, a third arc line M3 and a fourth oblique straight line M4, a first point convex tip a1 is formed between the first arc line M1 and the second oblique straight line M2, a second point concave tip a2 is formed between the second arc line M2 and the third arc line M3, and a third point convex tip a3 is formed between the third arc line M3 and the fourth oblique straight line M4.

When the centrifugal fan works, the M-shaped structure of the front edge area 310 can rectify airflow when the airflow enters the centrifugal fan, so that a vortex breaking effect is achieved, and the influence of horseshoe vortex and low-speed vortex on the efficiency of the centrifugal fan is solved.

Reference will now be made in detail to some embodiments, wherein "an embodiment" is referred to herein as a particular feature, structure, or characteristic that may be included in at least one implementation of the present application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Furthermore, the details of one or more embodiments are not fixedly presented in any particular order, and are not intended to limit the invention.

In example 1, referring to fig. 5, values of length m1 |, | m2 |, | m3 |, | m4 |, of first section arc m1, second section oblique straight line m2, third section arc m3 and fourth section oblique straight line m4 satisfy values of | m1 | > | m3 |, | m2 | > | m4 |, and the vortex breaking effect is better.

In embodiment 2, the upper end of the trailing edge region 320 is bent toward the center of the fan disk 200 (e.g., to the right as shown in fig. 3) to form a trailing edge bent portion 321, and the lower side of the trailing edge region 320 is recessed to form a C-shaped structure (e.g., to the front as shown in fig. 5), so that the influence of low-speed vortices can be well absorbed.

In embodiment 3, the blade 300 has an M-shaped cross section, wherein the cross section is: the blade is sectioned through any rotating shaft of the centrifugal fan, and the blade sectioned through the section can be seen as an M shape. The design scheme of the three-dimensional variable cross-section streamline blade can simultaneously reduce/relieve the horseshoe vortex distributed along the axial speed of the blade and the horseshoe vortex distributed along the radial speed of the blade, and achieves the effects of reducing the aerodynamic noise of the backward centrifugal fan and improving the work capacity of the backward centrifugal fan.

In embodiment 4, the upper end of the blade 300 is the wheel cover blade profile line n1, the lower end of the blade 300 is the wheel disc blade profile line n2, the wheel cover blade profile line n1, the length | n1 | and | n2 | of the wheel disc blade profile line n2 satisfy the values of | n1 | > | n2 |. The shroud blade profile line n1 and the disk blade profile line n2 are offset in the transverse direction to form an X-shaped structure, which corresponds to an X-shaped structure in a plan view of the blade 300, that is, the shroud blade profile line n1 and the disk blade profile line n2 form an X-shaped structure when the blade 300 is viewed from the annular shroud 100 toward the fan disk 200. This kind of design can effectually reduce the low-speed whirlpool that the air current produced in blade trailing edge department, and according to the utility model discloses a parameter design effect is better.

According to the above principle, the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention.

Claims

1. A centrifugal fan with high efficiency and low noise comprises an annular wheel cover (100) on the upper side and a fan wheel disc (200) on the lower side, wherein blades (300) are arranged between the annular wheel cover (100) and the fan wheel disc (200), and the centrifugal fan is characterized in that:

the blade (300) comprises a front edge area (310) and a tail edge area (320), wherein the front edge area (310) is of an M-shaped structure, the front edge area (310) sequentially comprises a first section of arc line (M1), a second section of inclined straight line (M2), a third section of arc line (M3) and a fourth section of inclined straight line (M4) from top to bottom, a first point convex tip (a1) is formed between the first section of arc line (M1) and the second section of inclined straight line (M2), a second point concave tip (a2) is formed between the second section of inclined straight line (M2) and the third section of arc line (M3), and a third point convex tip (a3) is formed between the third section of arc line (M3) and the fourth section of inclined straight line (M4).

2. A centrifugal fan of high efficiency and low noise according to claim 1, wherein: the length | m1 |, | m2 |, | m3 |, | m4 | -value satisfies | m1 | > | m3 |, | m2 | > | m4 | of the first section arc line (m1), the second section oblique straight line (m2), the third section arc line (m3), and the fourth section oblique straight line (m 4).

3. A centrifugal fan of high efficiency and low noise according to claim 1, wherein: the upper end of the tail edge region (320) bends towards the direction of the circle center of the fan wheel disc (200) to form a tail edge bending part (321), and the lower side of the tail edge region (320) is sunken to form a C-shaped structure.

4. A centrifugal fan of high efficiency and low noise according to claim 1, wherein: the meridian section of the blade (300) is of an M-shaped structure.

5. A centrifugal fan of high efficiency and low noise according to claim 3, wherein: blade (300) upper end is wheel cap department blade type line (n1), blade (300) lower extreme is wheel disc department blade type line (n2), wheel cap department blade type line (n1), the length of wheel disc department blade type line (n2) is | n1 |, | n2 | the value satisfies, | n1 | > | n2 |, wheel cap department blade type line (n1), the formation X font structure is staggered in the horizontal extending direction of wheel disc department blade type line (n 2).