Centrifugal impeller and centrifugal fan with same

Abstract

The invention discloses a centrifugal impeller and a centrifugal fan with the centrifugal impeller. The centrifugal impeller comprises a bottom plate, a plurality of blades and a plurality of blades, the multiple blades are arranged on the bottom plate at intervals in the circumferential direction of the bottom plate, the blades obliquely extend in the circumferential direction of the centrifugal impeller in the radial direction of the centrifugal impeller from inside to outside, the oblique extending direction of the blades is the same as the rotating direction of the centrifugal impeller, and the centrifugal impeller meets the conditions that 0.65 < = D2 / D1 < = 0.75, 39 degrees < = a1 < = 51 degrees, 51 degrees < = a2 < = 71 degrees and 8 < = n < = 12, d2 / D1 is the hub ratio of the centrifugal impeller, a1 is the inlet mounting angle of the blades, a2 is the outlet mounting angle of the blades, and n is the number of the blades. According to the centrifugal impeller, airflow can enter and be discharged out of the airflow channel between every two adjacent blades more smoothly, the flow velocity balance of the airflow at all positions in the channel between every two adjacent blades is improved, then energy waste caused by airflow disorder can be prevented, and the fan efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal fans, and in particular to a centrifugal impeller and a centrifugal fan having the same. Background Art

[0002] The working principle of a centrifugal fan is to rotate the impeller, use the blades to do work on the air, and then throw the air that has passed through the rectification channel of the two blades out through centrifugal action. However, in the existing fan impeller form, the blade flow channel has a relatively weak work effect on the airflow, resulting in a decrease in fan efficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide a centrifugal impeller, which can make the air flow enter and exit the air flow channel between two adjacent blades more smoothly, increase the flow rate balance of the air flow at various locations in the channel between two adjacent blades, thereby preventing energy waste caused by turbulence of the air flow and improving the efficiency of the fan.

[0004] The present invention also provides a centrifugal fan having the centrifugal impeller.

[0005] According to the first aspect of the present invention, the centrifugal impeller comprises: a base plate, the base plate is provided with an axial hole; a plurality of blades, the plurality of blades are arranged on the base plate at intervals along the circumference of the base plate, in the radial direction from inside to outside of the centrifugal impeller, the blades are obliquely extended along the circumference of the centrifugal impeller, and the direction of the oblique extension of the blades is opposite to the rotation direction of the centrifugal impeller, and the centrifugal impeller satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, wherein D2 / D1 is the hub ratio of the centrifugal impeller, a1 is the inlet installation angle of the blade, a2 is the outlet installation angle of the blade, and n is the number of the blades.

[0006] According to the centrifugal impeller of the present invention, by making the centrifugal impeller meet the conditions of: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the airflow can enter and be discharged from the airflow channel between two adjacent blades more smoothly, and the flow velocity balance of the airflow at various locations in the channel between two adjacent blades is increased, so that the airflow can flow smoothly in the channel between two adjacent blades, thereby preventing energy waste caused by turbulence of the airflow and improving the efficiency of the fan.

[0007] According to some embodiments of the present invention, the centrifugal impeller satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11.

[0008] According to some embodiments of the present invention, the base plate has a mounting boss, the mounting boss is circular, and the plurality of blades are arranged radially outside the mounting boss and are evenly spaced along the circumference of the mounting boss.

[0009] According to some embodiments of the present invention, the base plate further comprises: a connecting plate portion, the connecting plate portion is connected to the periphery of the mounting boss and extends radially outwardly along the mounting boss, and the plurality of blades are arranged on one side surface of the connecting plate portion.

[0010] According to some embodiments of the present invention, the connecting plate portion includes a plurality of connecting plates, the plurality of connecting plates are arranged at intervals along the circumference of the mounting boss, the plurality of connecting plates correspond one-to-one to the plurality of blades, and the blades are arranged on the corresponding connecting plates.

[0011] According to some embodiments of the present invention, the blade is connected to one side edge of the connecting piece in the circumferential direction of the mounting boss.

[0012] According to some embodiments of the present invention, reinforcing ribs are formed on the connecting piece.

[0013] According to some embodiments of the present invention, one end of the reinforcing rib is connected to the periphery of the mounting boss, and the other end of the reinforcing rib extends along the extension direction of the blade.

[0014] According to some embodiments of the present invention, the centrifugal impeller is integrally formed by stamping.

[0015] A centrifugal fan according to a second aspect of the present invention comprises the centrifugal impeller according to the first aspect of the present invention.

[0016] According to the centrifugal fan of the present invention, the centrifugal impeller of the first aspect is provided, thereby improving the overall performance of the centrifugal fan.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a centrifugal impeller according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a centrifugal impeller from another angle according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 100. Centrifugal impeller;

[0022] 10. Leaves;

[0023] 20. Bottom plate; 201. Axial hole; 21. Mounting boss; 22. Connecting plate portion; 221. Connecting piece; 23. Reinforcing rib. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Reference below Figure 1-Figure 2 A centrifugal impeller 100 according to an embodiment of the first aspect of the present invention is described.

[0026] like Figure 1 As shown, the centrifugal impeller 100 according to the first embodiment of the present invention includes: a base plate 20 and a plurality of blades 10, and the base plate 20 is provided with an axial hole 201; the plurality of blades 10 are arranged on the base plate 20 at intervals along the circumference of the base plate 20, and in the radial direction from inside to outside of the centrifugal impeller 100, the blades 10 extend obliquely along the circumference of the centrifugal impeller 100, and the direction of the oblique extension of the blades 10 is opposite to the rotation direction of the centrifugal impeller 100.

[0027] Specifically, the base plate 20 provides an installation position and a support function for the blades 10, the blades 10 are connected to the base plate 20, and the channel between two adjacent blades 10 forms an airflow channel, which is used for gas circulation; an axial hole 201 is provided on the base plate 20, and the axial hole 201 is circular and is arranged at the center of the base plate 20, and a plurality of blades are arranged at intervals along the circumference of the base plate 20, that is, a plurality of blades are arranged at intervals along the circumference of the axial hole 201; the blades 10 are obliquely extended along the circumference of the centrifugal impeller 100, and the oblique extension direction is opposite to the rotation direction of the centrifugal impeller 100 in the radial direction from inside to outside of the centrifugal impeller 100, that is, the centrifugal impeller 100 is a backward impeller. Among them, the air flow velocity at the impeller outlet of the backward impeller is relatively small. When the air flow velocity is low, the friction of the air duct on the air flow is also smaller, thereby reducing the energy loss of the air flow in the process from the air inlet to the air outlet, so that more of the shaft work transmitted by the motor can be converted into the static pressure of the fan. The static pressure of the fan increases, and the greater the static pressure of the fan, the more energy the impeller can transfer to the airflow, thereby improving the efficiency of the fan.

[0028] Furthermore, an axial hole 201 is formed on the base plate 20, and the axial hole 201 is arranged at the center position of the base plate 20. The axial hole 201 can be assembled with the output axial direction of the driving device. The plurality of blades 10 are arranged at intervals along the circumference of the base plate 20, so that the driving device can drive the plurality of blades 10 to rotate by driving the base plate 20 to rotate, so that the blades 10 can do work on the airflow and drive the airflow to move.

[0029] In some specific embodiments, the centrifugal impeller 100 satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, wherein D2 / D1 is the hub ratio of the centrifugal impeller 100, a1 is the inlet installation angle of the blade 10, a2 is the outlet installation angle of the blade 10, and n is the number of blades 10.

[0030] The hub ratio refers to the ratio of the hub diameter to the impeller diameter. The hub is the part of the impeller connected to the output shaft, and is used to connect the blades 10 and the output shaft. Under a given flow rate, the larger the hub ratio, the greater the output pressure. Thus, the output wind pressure of the centrifugal impeller 100 can be changed by changing the hub ratio of the impeller, thereby improving the fan efficiency.

[0031] Specifically, D2 / D1 is the hub ratio of the centrifugal impeller 100, that is, D2 is the diameter of the hub, and D1 is the diameter of the impeller. Figure 2 As shown, the distance d2 between the inner end of the blade 10 and the central axis of the base plate 20 is the radius of the hub, wherein the inner end of the blade 10 is the end of the blade 10 close to the central axis of the base plate 20, D2=2×d2; the distance d1 between the outer end of the blade 10 and the axis of the base plate 20 is the radius of the centrifugal impeller 100, wherein the outer end of the blade 10 is the end of the blade 10 away from the shaft hole 201, D1=2×d1, and then the hub ratio of the centrifugal impeller 100 can be obtained by d2 / d1.

[0032] a1 is the inlet installation angle of the blade 10, which is the angle between the tangent line of the circumference at the inlet end of the blade 10 and the blade 10, wherein the inlet end of the blade 10 is the end of the blade 10 close to the shaft hole 201. The airflow direction is related to the inlet installation angle of the blade 10, and the airflow direction can be changed by changing the inlet installation angle of the blade 10, reducing the impact loss of the airflow on the blade 10 when entering the airflow channel, thereby improving the fan efficiency.

[0033] Specifically, in a projection plane perpendicular to the central axis of the centrifugal impeller 100, a circle C1 is made with the central axis of the base plate 20 as the center O and a line from the center to the inner end of the blade 10 as the radius. The circle C1 and the inner end of the blade 10 form an intersection E1, and then a tangent F1 is made with the intersection E1 as the common intersection point. The angle between F1 and the blade 10 is the inlet installation angle a1 of the blade 10.

[0034] a2 is the outlet installation angle of the blade 10, which is the angle between the tangent line of the circumference of the outlet end of the blade 10 and the blade 10, wherein the outlet end of the blade 10 is the end away from the shaft hole 201. The outflow direction of the airflow is related to the outlet installation angle of the blade 10, and the outlet installation angle of the blade 10 can be adjusted to change the airflow direction, thereby reducing the collision between the air and the blade 10, ensuring the smoothness of the gas flow, thereby reducing energy loss and noise, and improving the efficiency of the fan.

[0035] Specifically, in a projection plane perpendicular to the central axis of the centrifugal impeller 100, a circle C2 is made with the central axis of the base plate 20 as the center O and a line from the center to the outer end of the blade 10 as the radius. The circle C2 and the front end of the blade 10 form an intersection E2, and then a tangent F2 is made with the intersection E2 as the common intersection point. The angle between F2 and the blade 10 is the inlet installation angle a2 of the blade 10.

[0036] n is the number of blades 10. The number of blades 10 of the impeller is an important parameter directly related to the aerodynamic performance of the fan. The number of blades 10 and the cross-sectional shape of the centrifugal impeller 100 determine the cross-sectional area of ​​the airflow channel. When the number of blades 10 is too small, the airflow channel is too wide, which may cause secondary vortexes to form in the impeller channel, resulting in pressure loss; when the number of blades 10 is too large, the effective flow area of ​​the gas is reduced, which will cause the impeller inlet impact loss and friction loss along the way to increase, and at the same time increase the load of the impeller main shaft, reducing the total pressure and efficiency of the fan.

[0037] In addition, the effective flow area of ​​the airflow channel can be improved by adjusting the hub ratio and the number of blades 10, and the outflow speed and smoothness of the airflow channel can be improved by adjusting the hub ratio and the number of blades 10, thereby improving the fan efficiency.

[0038] Through experimental calculations, it is found that when the centrifugal impeller 100 satisfies the following conditions: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the centrifugal impeller 100 can enable the airflow to enter and discharge the airflow channel between two adjacent blades 10 more smoothly, increase the flow velocity balance of the airflow at various locations in the channel between two adjacent blades 10, and thus enable the airflow to flow smoothly in the channel between two adjacent blades 10, thereby preventing energy waste caused by turbulence of the airflow and improving the efficiency of the fan.

[0039] Among them, the hub ratio can be 0.65, 0.66, 0.67, 0.68, 0.7 or 0.75, the inlet installation angle can be 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 48°, 50° or 51°; the outlet installation angle can be 51°, 52°, 53°, 54°, 55°, 56°, 58°, 60°, 62°, 64°, 65°, 70° or 71°; the number of blades 10 can be 8, 9, 10, 11 or 12.

[0040] For example, when other conditions of the fan are constant, the centrifugal impeller 100 of the present application meets the above parameters, and three groups of the above parameters are randomly selected for simulation experiments, and the experimental data are shown in the following table:

[0041]

[0042]

[0043] It can be seen from the above table that when the hub ratio is 0.65, the inlet installation angle is 39°, the outlet installation angle is 51°, and the number of blades 10 is 8, the static pressure of the fan is increased by 19.58% relative to the static pressure of the existing fan, and the air volume is increased by 9.64% compared with the air volume of the existing fan; when the hub ratio is 0.70, the inlet installation angle is 45°, the outlet installation angle is 61°, and the number of blades 10 is 10, the static pressure of the fan is increased by 24.52% relative to the static pressure of the existing fan, and the air volume is increased by 13.25% compared with the air volume of the existing fan; when the hub ratio is 0.71, the inlet installation angle is 51°, the outlet installation angle is 71°, and the number of blades 10 is 12, the static pressure of the fan is increased by 18.76% relative to the static pressure of the existing fan, and the air volume is increased by 10.12% compared with the air volume of the existing fan. It can be seen that the fan static pressure and fan air volume show a trend of first increasing and then decreasing with the increase of parameters. Among them, the hub ratio is 0.70, the inlet installation angle is 45°, the outlet installation angle is 61°, and the number of blades is 10, which are the optimal parameters. Under this condition, the static pressure increase and air volume increase are the highest.

[0044] According to the centrifugal impeller 100 of the embodiment of the present invention, by making the centrifugal impeller 100 satisfy the following conditions: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the airflow can enter and be discharged from the airflow channel between two adjacent blades 10 more smoothly, and the flow velocity balance of the airflow at various locations in the channel between two adjacent blades 10 is increased, so that the airflow can flow smoothly in the channel between two adjacent blades 10, thereby preventing energy waste caused by turbulence of the airflow and improving the efficiency of the fan.

[0045] According to some embodiments of the present invention, Figure 1 As shown, the centrifugal impeller 100 satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11. The fan static pressure increase and fan air volume increase of the centrifugal impeller 100 within this range are both excellent, and when the centrifugal impeller 100 satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11, the fan static pressure and fan air volume of the centrifugal fan using the centrifugal impeller 100 can be improved.

[0046] According to some embodiments of the present invention, Figure 1 As shown, the bottom plate 20 has a mounting boss 21, the mounting boss 21 is circular, and a plurality of blades 10 are arranged on the radial outer side of the mounting boss 21 and are evenly spaced along the circumference of the mounting boss 21. Among them, the plurality of blades 10 are evenly spaced along the axial direction of the mounting boss 21, which can improve the balance of the centrifugal impeller 100, and thus improve the integrity of the centrifugal impeller 100. At the same time, the mounting boss 21 is used to be connected to the driving device, and the blades 10 are installed on the radial outer side of the mounting boss 21, and then the driving device can drive the plurality of blades 10 to rotate by driving the mounting boss 21 to rotate, so that the blades 10 can do work on the airflow and drive the airflow to move. In addition, the mounting boss 21 is circular, has a simple structure, and is easy to produce, thereby reducing the production cost of the centrifugal impeller 100.

[0047] For example Figure 1 As shown, the mounting boss 21 is formed by the base plate 20 being recessed from one side to the other side in the thickness direction, the recessed side is adapted to the driving device, and the mounting boss 21 is in surface contact with the driving device, thereby increasing the contact area with the driving device and improving the installation stability of the centrifugal impeller 100.

[0048] According to some embodiments of the present invention, Figure 1 As shown, the bottom plate 20 also has: a connecting plate portion 22, the connecting plate portion 22 is connected to the periphery of the mounting boss 21 and extends radially outwardly of the mounting boss 21, and a plurality of blades 10 are arranged on one side surface of the connecting plate portion 22. The connecting plate portion 22 is used to connect the blades 10 and the mounting boss 21, and the connecting plate portion 22 provides an installation space for the blades 10; at the same time, the plurality of blades 10 are arranged on one side surface of the connecting plate portion 22, and the plurality of blades 10 and the mounting boss 21 are arranged on the same side, which can facilitate the molding and installation of the centrifugal impeller 100.

[0049] According to some embodiments of the present invention, Figure 1As shown, the connecting plate portion 22 includes a plurality of connecting pieces 221, and the plurality of connecting pieces 221 are arranged at intervals along the circumference of the mounting boss 21. The plurality of connecting pieces 221 correspond to the plurality of blades 10 one by one, and the blades 10 are arranged on the corresponding connecting pieces 221. For example, the plurality of connecting pieces 221 may be two, three or more. Among them, two adjacent blades 10 and the connecting piece 221 form an airflow channel, which can be used to limit the gas flow direction so that the airflow enters from the axial direction and flows out radially.

[0050] According to some embodiments of the present invention, Figure 1 As shown, the blade 10 is connected to one side edge of the connecting piece 221 in the circumferential direction of the mounting boss 21 , which can improve the convenience of forming the blade 10 .

[0051] For example Figure 1 As shown, one end of the blade 10 is connected to one side edge of the connecting piece 221 , and the other end extends in a direction away from the connecting piece 221 , and the blade 10 is vertically connected to the connecting piece 221 .

[0052] According to some embodiments of the present invention, Figure 1 As shown, reinforcing ribs 23 are formed on the connecting piece 221 , and the reinforcing ribs 23 can increase the structural strength of the connecting piece 221 , and further increase the connection stability of the blade 10 .

[0053] For example Figure 1 As shown, the reinforcing rib 23 is a convex structure formed on the side surface of the connecting piece 221 that is concave from the side surface away from the blade 10 toward the side surface close to the blade 10, and the convex structure is simple and easy to form, thereby reducing the production process of the blade 10 and reducing the production cost.

[0054] According to some embodiments of the present invention, Figure 1 As shown, one end of the reinforcing rib 23 is connected to the circumference of the mounting boss 21, and the other end of the reinforcing rib 23 extends along the extension direction of the blade 10, which can increase the structural strength of the entire connecting piece 221, and further increase the supporting stability of the connecting piece 221 to the blade 10; at the same time, the other end of the reinforcing rib 23 extends along the extension direction of the blade 10, and the direction of the reinforcing rib 23 is the same as that of the airflow, thereby reducing the influence of the reinforcing rib 23 on the airflow direction.

[0055] Furthermore, for example Figure 1 As shown, the raised portion of the reinforcing rib 23 is arc-shaped, and the arc-shaped structure can reduce the influence of the reinforcing rib 23 on the airflow.

[0056] According to some embodiments of the present invention, Figure 1As shown, the centrifugal impeller 100 is integrally formed by stamping. The integrally formed stamping has a simple structure and is easy to manufacture, thereby reducing the processing steps of the centrifugal impeller 100, increasing the processing speed of the centrifugal impeller 100, shortening the processing cycle, reducing material consumption, and reducing the production cost of the centrifugal impeller 100; at the same time, the integrally formed stamping can also reduce the installation steps of the centrifugal fan, thereby reducing the assembly process of the centrifugal fan and shortening the assembly time.

[0057] The centrifugal fan according to the second embodiment of the present invention comprises the centrifugal impeller 100 according to the first embodiment of the present invention.

[0058] According to the centrifugal fan of the embodiment of the present invention, the centrifugal impeller 100 of the first embodiment is provided, thereby improving the overall performance of the centrifugal fan.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A centrifugal impeller, characterized in that: include: A bottom plate, wherein the bottom plate is provided with an axial hole; A plurality of blades, wherein the plurality of blades are arranged on the bottom plate at intervals along the circumferential direction of the bottom plate, and in the radial direction from inside to outside of the centrifugal impeller, the blades are obliquely extended along the circumferential direction of the centrifugal impeller, and the oblique extension direction of the blades is opposite to the rotation direction of the centrifugal impeller, and the centrifugal impeller satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, Wherein, D2 / D1 is the hub ratio of the centrifugal impeller, a1 is the inlet installation angle of the blade, a2 is the outlet installation angle of the blade, and n is the number of the blades.

2. The centrifugal impeller according to claim 1, characterized in that: The centrifugal impeller satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11.

3. The centrifugal impeller according to claim 1, characterized in that: The bottom plate has a mounting boss, the mounting boss is circular, and a plurality of blades are arranged radially outside the mounting boss and are evenly spaced along the circumference of the mounting boss.

4. The centrifugal impeller according to claim 3, characterized in that: The bottom plate further comprises a connecting plate portion, the connecting plate portion is connected to the periphery of the mounting boss and extends radially outwardly along the mounting boss, and the plurality of blades are arranged on one side surface of the connecting plate portion.

5. The centrifugal impeller according to claim 4, characterized in that: The connecting plate portion includes a plurality of connecting plates, which are arranged at intervals along the circumference of the mounting boss, and the plurality of connecting plates correspond to the plurality of blades one by one, and the blades are arranged on the corresponding connecting plates.

6. The centrifugal impeller according to claim 5, characterized in that: The blade is connected to one side edge of the connecting piece in the circumferential direction of the mounting boss.

7. The centrifugal impeller according to claim 5, characterized in that: Reinforcing ribs are formed on the connecting piece.

8. The centrifugal impeller according to claim 7, characterized in that: One end of the reinforcing rib is connected to the periphery of the mounting boss, and the other end of the reinforcing rib extends along the extension direction of the blade.

9. The centrifugal impeller according to claim 1, characterized in that: The centrifugal impeller is integrally formed by stamping.

10. A centrifugal fan, characterized in that: Comprising a centrifugal impeller according to any one of claims 1-9.

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