CN215171036U - Centrifugal impeller and centrifugal fan - Google Patents

Abstract

The utility model discloses a centrifugal impeller and centrifugal fan. The centrifugal impeller comprises a wheel cover, a wheel disc and a plurality of main blades arranged between the wheel cover and the wheel disc, wherein the main blades are uniformly distributed along the circumferential direction of the wheel disc; an auxiliary blade is arranged between at least one group of two adjacent main blades, and the height of the auxiliary blade is smaller than that of the main blade; the installation angles of the auxiliary blades and the main blades are both larger than 90 degrees or both smaller than 90 degrees; the auxiliary blade and the main blade are both wing-shaped structures; the wheel disc is of a hollow circular ring structure, and the auxiliary blades are close to the outer periphery of the wheel disc and far away from the inner periphery of the wheel disc. The air quantity and the air pressure of the centrifugal fan can be improved by arranging the auxiliary impeller.

Description

Centrifugal impeller and centrifugal fan

Technical Field

The utility model relates to a fan technical field especially relates to a centrifugal impeller and centrifugal fan.

Background

The centrifugal fan is suitable for various ventilation and heat dissipation systems such as pipeline fans, heat dissipation fans, purification and ventilation systems and the like. The centrifugal fan comprises a centrifugal impeller and a motor driving the centrifugal impeller to rotate. The requirements of the application scenes on the air quantity and the air pressure of the centrifugal fan are higher and higher at present. At present, the lifting of the air volume and the air pressure can only be realized by improving the rotating speed of the motor, but on the alternating current capacitor type motor, the rotating speed is fixed because the power frequency of the motor is 50Hz, so that the upper limit of the rotating speed of the motor cannot be lifted, and the air volume and the air pressure of the centrifugal fan have a bottleneck.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a technical problem that will solve lies in, to the lower defect of the amount of wind pressure that provides of centrifugal impeller, provides a centrifugal impeller and centrifugal fan.

In order to solve the technical problem, an embodiment of the present invention provides a centrifugal impeller, which includes a wheel cover, a wheel disc, and a plurality of main blades disposed between the wheel cover and the wheel disc, wherein the plurality of main blades are uniformly distributed along a circumferential direction of the wheel disc;

an auxiliary blade is arranged between at least one group of two adjacent main blades, and the height of the auxiliary blade is smaller than that of the main blade; the mounting angles of the auxiliary blades and the main blades are both larger than 90 degrees or both smaller than 90 degrees; the auxiliary blade and the main blade are both wing-shaped structures;

the wheel disc is of a hollow circular ring structure, and the auxiliary blades are close to the outer periphery of the wheel disc and far away from the inner periphery of the wheel disc.

Preferably, the minimum distance between the auxiliary blade and the inner periphery of the disk is greater than the minimum distance between the primary blade and the inner periphery of the disk.

Preferably, the ratio of the height of the auxiliary blade to the height of the main blade ranges from 40% to 60%.

Preferably, the ratio of the surface area of the auxiliary blade to the surface area of the main blade ranges from 15% to 35%.

Preferably, the number of the auxiliary blades is multiple, all the auxiliary blades are uniformly distributed along the circumferential direction of the disk, and the number of the auxiliary blades is the same as that of the main blades.

Preferably, the difference between the installation angle of the auxiliary blade and the installation angle of the main blade ranges from-3 degrees to 3 degrees.

Preferably, the installation angles of the auxiliary blade and the main blade are both less than 90 degrees.

Preferably, the auxiliary blade is integrally formed with the disk, and the main blade is integrally formed with the shroud; the wheel disc and the wheel cover are fixedly connected through riveting.

Preferably, one side of the wheel cover is provided with the main blade, and the other side of the wheel cover is provided with a noise reduction structure;

the noise reduction structure comprises a plurality of noise reduction blades which are uniformly distributed along the circumferential direction of the wheel cover, and the noise reduction blades are of wing-shaped structures.

The embodiment of the utility model provides a still provide a centrifugal fan, including motor and above-mentioned arbitrary any centrifugal impeller, the motor with centrifugal impeller fixed connection.

Implement the embodiment of the utility model provides a, following beneficial effect has: the auxiliary blade is arranged between two adjacent main blades, so that the wind pressure at the radial outlet of the centrifugal impeller can be increased; meanwhile, the height of the auxiliary blade is smaller than that of the main blade, the auxiliary blade is close to the periphery of the wheel disc, the inner periphery far away from the wheel disc can reduce the blocking effect of the auxiliary blade on the wind of the air outlet, the increased wind pressure and wind quantity can be released outwards smoothly through the air outlet, and finally the wind pressure and wind quantity outside the air outlet is increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a centrifugal impeller provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of an embodiment of a centrifugal impeller according to the present invention.

The centrifugal impeller includes: the turbine blade assembly comprises a wheel cover 1, a wheel disc 2 and a plurality of main blades 3 arranged between the wheel cover 1 and the wheel disc 2, wherein the main blades 3 are uniformly distributed along the circumferential direction of the wheel disc 2; an auxiliary blade 4 is arranged between at least one group of two adjacent main blades 3, and the height of the auxiliary blade 4 is smaller than that of the main blade 3; the installation angles of the auxiliary blades 4 and the main blades 3 are both larger than 90 degrees or both smaller than 90 degrees; the auxiliary blades 4 and the main blades 3 are both wing-shaped structures; the disk 2 is a hollow circular ring structure, and the auxiliary blades 4 are close to the outer periphery 21 of the disk 2 and far away from the inner periphery 22 of the disk 2.

The installation angle refers to an included angle between an outer side extension line of the blade and a tangent line of the rotation direction of the point of the blade in the opposite direction when viewed from the radial section of the wind wheel. The impeller with the mounting angle larger than 90 degrees is a forward-inclined impeller, and the impeller with the mounting angle smaller than 90 degrees is a backward-inclined impeller. The embodiment of the present invention may preferably set the installation angles of the auxiliary blade 4 and the main blade 3 to be less than 90 degrees.

The embodiment of the utility model can increase the wind pressure at the radial outlet of the centrifugal impeller by arranging the auxiliary blade 4 between two adjacent main blades 3; meanwhile, the height of the auxiliary blade 4 is smaller than that of the main blade 3, the auxiliary blade 4 is close to the outer periphery 21 of the wheel disc 2, the inner periphery 22 far away from the wheel disc 2 can reduce the blocking effect of the auxiliary blade 4 on the wind of the air outlet, the increased wind pressure and the increased wind volume can be released outwards smoothly through the air outlet, and finally the wind pressure and the wind volume outside the air outlet are increased.

Preferably, the minimum distance between the auxiliary blades 4 to the inner periphery 22 of the disk 2 is greater than the minimum distance between the primary blades 3 to the inner periphery 22 of the disk 2. In this case, the blocking effect of the auxiliary blade 4 to the wind of the wind outlet can be further reduced.

Preferably, the ratio of the height of the auxiliary blade 4 to the height of the main blade 3 ranges from 40% to 60%; the ratio of the surface area of the auxiliary blade 4 to the surface area of the main blade 3 ranges from 15% to 35%. The inventor verifies that the two ratio ranges can enable the wind pressure and the wind volume outside the air outlet between the two main blades 3 to reach the maximum range. Wherein, the optimal ratio range of the height of the auxiliary blade 4 to the height of the main blade 3 is 45-55%. The optimal ratio of the surface area of the auxiliary blade 4 to the surface area of the main blade 3 ranges from 20% to 30%.

Preferably, the number of the auxiliary blades 4 is plural, and all the auxiliary blades 4 are uniformly distributed along the circumferential direction of the disk 2, and the number of the auxiliary blades 4 is the same as that of the main blades 3. Thus, an auxiliary blade 4 is disposed between any two adjacent main blades 3. The number of the auxiliary blades 4 and the main blades 3 can be 7, and 175 impellers are formed. The auxiliary blades 4 are uniformly distributed along the circumferential direction of the wheel disc 2, so that the air output and the air pressure of each air outlet are uniform, and the vibration of the centrifugal impeller caused by the non-uniform air output and the air pressure of each air outlet is avoided.

Preferably, the difference between the installation angle of the auxiliary blade 4 and the installation angle of the main blade 3 is-3 to 3 degrees. The inventor verifies that the absolute value of the difference between the installation angle of the auxiliary blade 4 and the installation angle of the main blade 3 exceeds 3, so that the wind resistance is overlarge, and a larger air output can be achieved when the difference is in a range of-3 to 3 degrees.

Preferably, the auxiliary blades 4 are integrally formed with the disk 2, and the main blades 3 are integrally formed with the shroud 1; the wheel disc 2 and the wheel cover 1 can be fixedly connected through ultrasonic riveting.

In addition, one side of the wheel cover 1 is provided with a main blade 3, and the other side of the wheel cover 1 is provided with a noise reduction structure; the noise reduction structure comprises a plurality of noise reduction blades 5 which are uniformly distributed along the edge of the wheel cover 1, and the noise reduction blades 5 are of wing-shaped structures. The installation angles of the noise reduction blades 5 and the main blades 3 are both larger than 90 degrees or both smaller than 90 degrees. The embodiments of the present invention are preferably all less than 90 degrees. The mounting angles have been described above and will not be described in detail here.

The wheel cap 1 is hollow structure, forms the air intake, when wind gets into the wind gap through the smooth surface of wheel cap 1, can produce the vortex noise, falls blade 5 through the setting, stops the above-mentioned wind that produces the vortex noise, can play the effect of noise reduction. In order to reduce noise better, the absolute value range of the difference value between the installation angle of the noise reduction blade 5 and the installation angle of the main blade 3 is 3-7 degrees.

Preferably, the projections of any two adjacent noise reduction blades 5 on the axial plane have an overlapping region; the axial plane is a plane passing through the axial center line of the wheel cover 1. This prevents a gap from being formed between two adjacent noise reduction blades 5, which would cause airflow to enter the intake opening through the gap, resulting in increased noise.

Preferably, the wheel cover 1 is a hollow circular ring structure; the connecting line of the noise reduction blades 5 and the wheel cover 1 is an arc line, the arc line extends from the outer edge 11 of the wheel cover 1 to the inner edge 12 of the wheel cover 1, and the minimum distance between the arc line and the inner edge 12 of the wheel cover 1 is larger than 0. The impeller is characterized in that the front and the back of the impeller are continuously connected with the noise reduction blades to continuously prevent the air outside the impeller from repeatedly entering the air inlet, so that the phenomenon that the air quantity is reduced and the phenomenon that the repeatedly entering air generates vortex to cause larger noise is avoided.

Preferably, the height of the shroud 1 is gradually increased from the outer edge 11 to the inner edge 12 in the axial direction of the centrifugal impeller, and the height of the noise reduction blades 5 is lower than the height of the inner edge 12. Such as the noise reduction blades 5 having a height greater than the height of the inner edge 12, may have an impact on the installation of other components of the centrifugal motor.

Further, since the height of the shroud 1 gradually increases from the outer edge 11 to the inner edge 12, the height of the noise reduction blades 5 protruding from the shroud 1 in the extending direction from the outer edge 11 of the shroud 1 to the inner edge 12 of the shroud 1 may be gradually reduced for the sake of beauty and reduction in material cost. In the axial lead direction of the centrifugal impeller, the protrusion height specifically refers to the distance between the top of the noise reduction blade 5 and the connecting line of the noise reduction blade and the shroud 1.

The embodiment of the utility model provides a still provide a centrifugal fan, including motor and above-mentioned centrifugal impeller, motor and centrifugal impeller fixed connection.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. The centrifugal impeller is characterized by comprising an impeller cover, a wheel disc and a plurality of main blades arranged between the impeller cover and the wheel disc, wherein the main blades are uniformly distributed along the circumferential direction of the wheel disc;

an auxiliary blade is arranged between at least one group of two adjacent main blades, and the height of the auxiliary blade is smaller than that of the main blade; the mounting angles of the auxiliary blades and the main blades are both larger than 90 degrees or both smaller than 90 degrees; the auxiliary blade and the main blade are both wing-shaped structures;

the wheel disc is of a hollow circular ring structure, and the auxiliary blades are close to the outer periphery of the wheel disc and far away from the inner periphery of the wheel disc.

2. The centrifugal impeller of claim 1, wherein the minimum distance between the auxiliary blades to the inner periphery of the disk is greater than the minimum distance between the primary blades to the inner periphery of the disk.

3. The centrifugal impeller according to claim 1, wherein the ratio of the height of the auxiliary blades to the height of the main blades ranges from 40% to 60%.

4. The centrifugal impeller of claim 1, wherein the ratio of the surface area of the auxiliary blades to the surface area of the main blades ranges from 15% to 35%.

5. The centrifugal impeller according to claim 1, wherein the number of the auxiliary blades is plural, and all the auxiliary blades are uniformly distributed in the circumferential direction of the disk, and the number of the auxiliary blades is the same as that of the main blades.

6. The centrifugal impeller according to claim 1, wherein the difference between the stagger angle of the auxiliary blades and the stagger angle of the main blades is in the range of-3 to 3 degrees.

7. The centrifugal impeller of claim 1, wherein the auxiliary blades and the main blades each have a stagger angle of less than 90 degrees.

8. The centrifugal impeller of claim 1, wherein said auxiliary blades are integrally formed with said disk and said main blades are integrally formed with said shroud; the wheel disc and the wheel cover are fixedly connected through riveting.

9. The centrifugal impeller of claim 1 wherein one side of said shroud is provided with said primary blades and the other side of said shroud is provided with a noise reducing structure;

the noise reduction structure comprises a plurality of noise reduction blades which are uniformly distributed along the circumferential direction of the wheel cover, and the noise reduction blades are of wing-shaped structures.

10. A centrifugal fan comprising a motor and a centrifugal impeller according to any one of claims 1-9, the motor being fixedly connected to the centrifugal impeller.

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