CN211623814U

CN211623814U - Fan impeller with scale transition layer

Info

Publication number: CN211623814U
Application number: CN202020046484.4U
Authority: CN
Inventors: 邵根强; 林树军; 陈洪星
Original assignee: Zhejiang Mingzhen Electronics Co ltd
Current assignee: Zhejiang Mingzhen Electronics Co ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-10-02
Anticipated expiration: 2030-01-09

Abstract

The utility model provides a fan wheel with scale transition layer includes bottom plate and the fixed a plurality of blades that set up on the bottom plate at least, and is a plurality of the blade is evenly arranged around the axis of bottom plate, and the position that the pressure surface and the bottom plate of blade are connected is equipped with arc transition portion, and the surface of arc transition portion is equipped with the scale transition layer, and the scale transition layer includes a plurality of scaly archs, and the bellied orientation of scaly matches with the flow direction of air current. On one hand, the scale transition layer can improve the structural strength of the blade and effectively reduce the stress at the maximum stress position of the blade; on the other hand, the scale transition layer can effectively avoid the air current development of blade and bottom plate hookup location department to form the torrent, has increased the efficiency of the fan wheel who is equipped with the scale transition layer.

Description

Fan impeller with scale transition layer

Technical Field

The utility model relates to a fan wheel field, concretely relates to fan wheel with scale transition layer.

Background

With the development of technology, the field of modern fans aims to realize higher fan power, wherein the flow rate of airflow flowing out of the fan is a key factor for measuring the fan power. Methods for increasing the velocity of the air flowing out of the fan typically include increasing the volume of the blades for further work, or increasing work by increasing the speed of the fan's impeller. In both the two methods, the structural strength of the blade is required to be high, but the energy required for starting the fan is high when the mass of the fan is high, so that the general fan blade is thin as a whole, the strength performance of the blade is greatly limited under the condition that a new material is not used, the blade is extremely easy to damage when working under the atmosphere pressure environment, and the service life of fan equipment is seriously influenced.

In the experimental process, through simulation and engineering experience, the maximum stress position of the blade is located at the connecting position of the blade and the bottom plate, particularly on the pressure surface side of the blade, and the acting force on the side, which is closer to the air inlet, of the blade is larger. In addition, in the centrifugal impeller, turbulence is easily formed at a connecting position of the blades and the bottom plate, which causes a large pressure loss of the air flow, and further causes a low efficiency of the impeller.

In order to increase the strength of the blade, the traditional solution is to increase the thickness of the blade root by providing a transition part at the connection position of the blade and the bottom plate to increase the strength, but the optimization effect of the method is more general.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the blades in the fan are easy to break under the atmospheric pressure, cannot meet the requirements on the power of the fan in modern industry, and have short service life, thereby influencing the normal use. Meanwhile, in the centrifugal impeller, turbulence is easily formed at the connecting position of the blades and the bottom plate, and the efficiency of the impeller is reduced.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

the utility model provides a fan wheel with scale transition layer includes a plurality of blades on the bottom plate of bottom plate and fixed locating at least, and is a plurality of the blade winds the axis of bottom plate is evenly arranged, the pressure surface of blade with the position that the bottom plate is connected is equipped with arc transition portion, the surface of arc transition portion is equipped with the scale transition layer, the scale transition layer includes a plurality of flaky archs.

Preferably, the suction surface of blade with the position that the bottom plate is connected is equipped with arc transition portion, the surface of arc transition portion is equipped with the scale transition layer, the scale transition layer includes the arch of a plurality of scales.

Preferably, the blade-type air conditioner further comprises a top plate, the top plate is parallel to and coaxial with the bottom plate, the blades are fixedly arranged between the top plate and the bottom plate, an air flow channel is formed between every two adjacent blades, an air inlet is formed in the top plate, and the air inlet is communicated with the air flow channel.

Furthermore, the outer edge of the air inlet is arranged in an upward protruding mode.

Further, the top of blade is provided with the blade top bulge, the blade top bulge extends to in the air inlet.

Furthermore, a fillet is arranged at the corner position of the convex part of the blade top.

Preferably, the distance between the outer edge of the top plate and the axis of the top plate is greater than the maximum distance between the vane and the axis of the top plate; the distance between the base plate outer edge and the base plate axis is greater than the maximum distance between the blade and the base plate axis.

Preferably, an included angle between one side edge of the blade corresponding to the outlet of the airflow channel and the bottom plate is smaller than 90 °.

Preferably, the area of the inlet side of the gas flow passage is smaller than the area of the outlet side of the gas flow passage.

Preferably, both side surfaces of the blade are curved.

The advantage of above-mentioned scheme lies in, the scale transition layer can effectively reduce the effort that the blade root is close to air inlet one side and receives. The principle of this kind of optimization effect lies in, on the one hand, the scale transition layer can provide the support for blade and bottom plate hookup location, and the transmission of inside stress can be cut off to the arch of scale form moreover, reduces the concentrated inside stress of stress concentration point. Meanwhile, the scale transition layer can increase the thickness of the connecting position of the blade and the bottom plate to a certain extent, and the structural strength of the blade is enhanced. Moreover, the scale transition layer can also play the effect of water conservancy diversion, and the air current can form a minimum whirlpool at the bellied tip of scale form when flowing through the scale transition layer, helps keeping the air current to adhere to and flow on the scale transition layer, avoids mixed and disorderly air current to diffuse to mainstream district formation torrent to reduce the loss of pressure of air current when flowing.

Drawings

FIG. 1 is a front view of a fan wheel provided with a scale transition layer;

FIG. 2 is a cross-sectional view of the portion A of FIG. 1;

FIG. 3 is a perspective view of a fan wheel with scale transition layers;

FIG. 4 is a partial schematic view of the portion B of FIG. 3;

FIG. 5 is a partial schematic view of the portion of FIG. 3C;

FIG. 6 is a perspective view of another perspective of a fan wheel with scale transition layers;

FIG. 7 is a partial schematic view of the portion D of FIG. 6;

FIG. 8 is a schematic diagram showing efficiency curves before and after arranging a scale transition layer;

description of reference numerals: 1-blade, 11-scale transition layer, 12-arc transition part, 13-blade top protrusion part, 21-top plate, 22-bottom plate and 23-air inlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, an integral connection, or a detachable connection; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.

It should be noted that the descriptions of "pressure surface", "suction surface", "impeller efficiency", etc. are understood by those skilled in the art, and the meaning and characteristics thereof, the naming principle and the effect thereof will not be specifically described below.

The utility model discloses a preferred embodiment is shown in fig. 1 to 7, including roof 21 and bottom plate 22, be equipped with an air intake 23 on the roof 21, fixedly between roof 21 and the bottom plate 22 being equipped with a plurality of blades 1, blades 1 evenly arranges around the axis of bottom plate 22. The adjacent blades 1, the top plate 21 and the bottom plate 22 jointly enclose an airflow channel, the inlet of the airflow channel is communicated with the air inlet 23, and the outlet of the airflow channel is close to the outer edge of the bottom plate 22. The embodiment is a centrifugal impeller, and certainly, the embodiment may also be an axial-flow impeller or other types of impellers, and the basic structure thereof is not described herein.

In order to enhance the strength performance of the blade 1, as shown in fig. 7, an arc-shaped transition portion 12 is disposed at a position where the pressure surface side of the blade 1 is connected to the bottom plate 22, and the arc-shaped transition portion 12 may increase the thickness of the connecting position of the blade 1 and the bottom plate 22, and also plays a role in enhancing the strength performance of the blade 1. The surface of arc transition portion 12 is equipped with scale transition layer 11, and scale transition layer 11's appearance is shown in fig. 5, including a plurality of archs, protruding appearance and the mode of arranging are similar to the fish scale, and the flaky arch is arranged towards air current channel's export one side, and with the air current flow direction phase-match.

The scale transition layer 11 can play a role in enhancing the strength performance of the blade 1. With the help of numerical simulation software, under the condition that the sizes of the fan impellers are the same, airflow is set to be constant flow air, and the fan impellers are subjected to simulation calculation under the working condition that the rotating speed is 3000 rpm. The calculation results show that on the blade 1 provided with the scale transition layer 11, the stress applied at the maximum stress position of the blade 1 is reduced by about 10% compared with the maximum stress applied on the blade without the scale transition layer 11, and on the scale transition layer 11, the end part position of part of the bulge presents a state of acting stress concentration. From comprehensive analysis, the internal acting force transmitted to the inlet side of the airflow channel from the inside of the blade 1 is blocked by the flaky bulges, so that the stress finally transmitted to the inner side of the blade 1 corresponding to the inlet side of the airflow channel is reduced. Meanwhile, the scale transition layer 11 can also play a role in supporting the blade 1 in a certain sense, so that the stress at the maximum stress position of the blade 1 is effectively reduced after various factors are integrated, the strength performance of the blade 1 is improved, and the service life of the blade 1 is prolonged.

Moreover, the scale transition layer 11 can also play a role in guiding water, and the principle of the guiding water and enhancing efficiency is similar to that of the fish scale, and is not explained in much detail herein.

In practice, the blade 1 usually comprises a suction surface and a pressure surface, and the pressure surface is subjected to a pressure of the airflow which is much greater than the suction surface. The fan impeller provided with the scale transition layer as shown in fig. 1 is a centrifugal impeller, and the airflow is sucked from a middle position along the axial direction, and flows out from the edge of the bottom plate 22 after flowing through the airflow channel. In the impeller in the form, the end surface of the blade 1 facing the axial line side of the bottom plate 22 is a suction surface, and the side surface facing away from the axial line of the bottom plate 22 is a pressure surface, so that the strength performance of the blade 1 can be effectively improved only by arranging the scale transition layer 11 on the side of the pressure surface with larger airflow pressure, namely the side surface facing away from the axial line of the bottom plate 22, in consideration of the characteristics of the suction surface and the pressure surface. Of course, the suction surface side may also be provided with the arc transition portion 12 and the scale transition layer 11, which may also play a role in enhancing the strength performance of the blade 1.

In order to guide the airflow before entering the airflow channel, the outer peripheral wall of the air inlet 23 is arranged to protrude upwards, and the blade 1 is provided with a blade top protruding part 13, and the blade top protruding part 13 extends into the air inlet 23. The blade top protruding part 13 can guide the airflow before the blades 1 apply work to the airflow, so that the airflow field between the blades 1 is more regular, and the efficiency of the impeller is improved. To reduce pressure loss caused by the airflow impacting the tip relief 13, the corners of the tip relief 13 are rounded.

Further, the top plate 21 and the bottom plate 22 are coaxial, and the distance between the outer edges of the top plate 21 and the bottom plate 22 and the axes of the top plate and the bottom plate is larger than the maximum distance between the blade 1 and the axis of the bottom plate 22. The design can enable the top plate 21 and the bottom plate 22 to completely cover the blades 1, and an airflow diffusion space is formed between the top plate 21 and the bottom plate 22 and close to the outer edges of the top plate and the bottom plate, and the airflow diffusion space enables airflow to be sufficiently diffused after flowing through the airflow channel between the blades 1, so that the airflow can sufficiently convert dynamic pressure into static pressure, and the airflow pressure loss is reduced.

In order to make the air flow spread more uniformly, the included angle between the edge of the blade 1 corresponding to the outlet of the air flow channel and the bottom plate 22 is less than 90 °, so as to obtain a larger air flow spreading space at the position of the bottom plate 22.

In a preferred embodiment, both side surfaces of the blade 1 are designed to be arc-shaped, and the blade 1 with the shape can be better matched with the design after simulation calculation, so that the efficiency of the impeller is higher.

In the preferred embodiment shown, the cross-sectional area of the inlet side of the gas flow channel is smaller than the cross-sectional area of the outlet side of the gas flow channel, so that the gas flow can be sufficiently diffused in the flow.

Fig. 8 is a graph showing the comparison of efficiency between the impeller without the scale transition layer and the impeller with the scale transition layer, in which the curve X shows the efficiency curve of the fan impeller without the scale transition layer, and the curve Y shows the efficiency curve of the fan impeller without the scale transition layer, so that it can be seen that the fan impeller with the scale transition layer has higher efficiency at a large flow rate.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. The utility model provides a fan wheel with scale transition layer includes a plurality of blades (1) on bottom plate (22) are located to bottom plate (22) and fixed at least, and is a plurality of blade (1) wind the axis of bottom plate (22) is evenly arranged, its characterized in that, the pressure surface of blade (1) with the position that bottom plate (22) are connected is equipped with arc transition portion (12), the surface of arc transition portion (12) is equipped with scale transition layer (11), scale transition layer (11) include a plurality of scaly archs.

2. The fan impeller provided with scale transition layers as claimed in claim 1, wherein the suction surface of the blade (1) is provided with an arc transition part (12) at the position connected with the bottom plate (22), the surface of the arc transition part (12) is provided with a scale transition layer (11), and the scale transition layer (11) comprises a plurality of scale-shaped bulges.

3. The fan impeller provided with the scale transition layer as claimed in claim 1, further comprising a top plate (21), wherein the top plate (21) is parallel to and coaxial with the bottom plate (22), the blades (1) are fixedly arranged between the top plate (21) and the bottom plate (22), an airflow channel is formed between adjacent blades (1), an air inlet (23) is arranged on the top plate (21), and the air inlet (23) is communicated with the airflow channel.

4. The fan impeller with the scale transition layer as claimed in claim 3, wherein the peripheral wall of the air inlet (23) is provided with an upwardly protruding flange.

5. Fan wheel with scale transition according to claim 4, characterized in that the top of the blade (1) is provided with a tip protrusion (13), the tip protrusion (13) extending into the air inlet (23).

6. Fan wheel with scale transition layer according to claim 5, characterized in that the corner positions of the tip projections (13) are rounded.

7. Fan wheel provided with a scale transition layer according to claim 3, characterized in that the distance between the outer edge of the top plate (21) and the axis of the top plate (21) is greater than the maximum distance between the blade (1) and the axis of the top plate (21); the distance between the outer edge of the bottom plate (22) and the axis of the bottom plate (22) is larger than the maximum distance between the blade (1) and the axis of the bottom plate (22).

8. Fan wheel with scale transition as in claim 3, characterized in that the angle between the side edge of the blade (1) corresponding to the outlet of the air flow channel and the bottom plate (22) is less than 90 °.

9. The fan wheel provided with the scale transition layer as claimed in any one of claims 3 to 8, wherein the area of the inlet side of the air flow passage is smaller than the area of the outlet side of the air flow passage.

10. The fan wheel with scale transition layer according to any of claims 1-8, characterized in that both sides of the blade (1) are curved.