Centrifugal fan blade and fresh air module

Abstract

The utility model provides a centrifugal fan blade and a fresh air module. The centrifugal fan blade comprises a front disc and a rear disc, the chassis and the front disc are arranged at intervals in the axial direction; a plurality of first fan blades are arranged between the front disc and the bottom disc, and the multiple first fan blades are arranged in the circumferential direction of the centrifugal fan blades at intervals; the first fan blade is provided with a first end part close to or connected with the front disc and a second end part close to or connected with the bottom disc; the first fan blade extends from the first end part to the second end part, and the extension direction of the first fan blade is inclined to the axial direction of the centrifugal fan blade.

Description

Technical Field

[0001] The present application relates to the field of fresh air technology, and in particular to centrifugal fan blades and fresh air modules. Background Art

[0002] Centrifugal fan blades are crucial airflow components in fresh air modules. Driven by a motor, negative pressure is created in the center of the fan hub, drawing air from the fresh air duct into the blade area along its meridian plane. The blades then perform work on the air, creating airflow. However, due to the varying axial heights of the incoming air, uneven airflow distribution can easily lead to vortices and secondary flows, resulting in high noise levels.

[0003] Utility Model

[0004] The main purpose of this application is to provide a centrifugal fan blade and a fresh air module, aiming to solve the technical problem of high noise of centrifugal fan blades in the prior art.

[0005] The present invention provides a centrifugal fan blade, which includes:

[0006] front disc;

[0007] A chassis, wherein the chassis and the front disk are spaced apart along the axial direction of the centrifugal fan blade;

[0008] A plurality of first fan blades are arranged between the front disk and the chassis, and the plurality of first fan blades are arranged at intervals along the circumference of the centrifugal fan blade; the first fan blade has a first end close to or connected to the front disk and a second end close to or connected to the chassis; the first fan blade extends from the first end to the second end, and the extension direction of the centrifugal fan blade is inclined to the axial direction of the centrifugal fan blade.

[0009] Optionally, the chassis has a disk center, the first end has a first center of curvature, and the second end has a second center of curvature; the line connecting the first center of curvature and the disk center is a first line, and the line connecting the second center of curvature and the disk center is a second line. The angle between the first line and the second line is the misalignment angle of the first center of curvature of the first end and the second center of curvature of the second end along the circumferential direction, and the value range of the misalignment angle is 1-6°.

[0010] Optionally, the outlet installation angle of the first end portion is equal to the outlet installation angle of the second end portion; and / or

[0011] The first center of curvature of the first end portion of the same first blade is located upstream of the second center of curvature of the second end portion in the rotational direction.

[0012] Optionally, the centrifugal fan blades further include a plurality of second fan blades, which are arranged between the chassis and the front disc at intervals along the axial direction; the second fan blades are vertical fan blades;

[0013] Wherein, the plurality of second fan blades and the plurality of first fan blades are arranged at intervals along the axial direction.

[0014] Optionally, the centrifugal fan blade has a middle ring, and the front disc, the middle ring and the bottom disc are spaced apart along the axial direction;

[0015] The plurality of second fan blades are respectively connected to the chassis and the middle ring at both ends in the axial direction;

[0016] The second ends of the plurality of first fan blades are connected to the middle ring, and the first ends of the plurality of first fan blades are connected to the front disk.

[0017] Optionally, a ratio of the axial height of the first fan blade to the axial height of the second fan blade is 2:1-4:1.

[0018] Optionally, the centrifugal fan blades include a first group of first fan blade arrays and a second group of first fan blade arrays, and both the first group of first fan blade arrays and the second group of first fan blade arrays include the plurality of first fan blades;

[0019] The centrifugal fan blade includes a first support ring and a second support ring, wherein the first support ring and the second support ring are arranged between the base plate and the front plate along the axial direction at intervals;

[0020] The first ends of the first blades of the first group of first blade arrays are connected to the front disk, and the second ends of the first blades of the first group of first blade arrays are connected to the first support ring;

[0021] Two ends of the second fan blade in the axial direction are respectively connected to the first support ring and the second support ring;

[0022] The first ends of the first blades of the second group of first blade arrays are connected to the second support ring, and the second ends of the first blades of the second group of first blade arrays are connected to the chassis.

[0023] Optionally, a ratio of the axial height of the first fan blade to the axial height of the second fan blade is 3:2-3:1.

[0024] Optionally, the center of curvature of the second fan blade and the first center of curvature of the first end are offset in the circumferential direction; and / or the center of curvature of the second fan blade and the second center of curvature of the second end are offset in the circumferential direction.

[0025] Optionally, holes are partially bored on the chassis.

[0026] Optionally, the number of the first fan blades is 53.

[0027] An embodiment of the present application also provides a fresh air module, comprising the centrifugal fan blades as described above.

[0028] In the technical solution of the embodiment of the present application, a plurality of first blades arranged at intervals along the circumference of the centrifugal fan blade have an axial first end and a second end, and the first fan blade extends from the first end to the second end, the first end is close to or connected to the front disk, and the second end is close to or connected to the chassis, and the extension direction of the first fan blade is inclined to the axial direction of the centrifugal fan blade, thereby causing the first fan blade to twist, so as to compensate for the defect of uneven air intake in the front disk, the middle part of the centrifugal fan blade, and the chassis due to different axial air intake heights, so that after the first fan blade is twisted, the air intake of the centrifugal fan blade at different axial positions is more uniform, suppressing the flow separation phenomenon in the blade path, improving the aerodynamic performance, reducing noise, and helping to increase the air volume of the centrifugal fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a centrifugal fan blade provided in an embodiment of the present application;

[0031] Figure 2 for Figure 1 A simplified schematic diagram of a centrifugal fan blade is shown;

[0032] Figure 3 A total pressure diagram obtained by performing flow field analysis on the centrifugal fan blade provided in an embodiment of the present application;

[0033] Figure 4 A turbulent kinetic energy diagram obtained by performing flow field analysis on the centrifugal fan blade provided in an embodiment of the present application;

[0034] Figure 5 Another structural schematic diagram of the centrifugal fan blade provided in an embodiment of the present application;

[0035] Figure 6 for Figure 5 A side view of the centrifugal fan blade shown in the example;

[0036] Figure 7 A further structural schematic diagram of the centrifugal fan blade provided in an embodiment of the present application;

[0037] Figure 8 for Figure 5 or Figure 7 A simplified schematic diagram of a centrifugal fan blade is shown;

[0038] Figure 9 Another structural schematic diagram of the centrifugal fan blade provided in an embodiment of the present application;

[0039] Figure 10 This is a schematic structural diagram of a fresh air module using the centrifugal fan provided in an embodiment of the present application.

[0040] Reference Signs List

[0041]

[0042] DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their 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 at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Fresh air is a crucial function for the healthy development of air conditioners. Air conditioners incorporate fresh air modules to draw outdoor air into the room, regulating the freshness of the air, thereby improving air quality and benefiting the user's health. Fresh air modules typically include a volute, filter, suction sponge, silencer, centrifugal fan blades, motor, and fresh air ducts. The centrifugal fan blades are the key wind-driven component of the fresh air module, playing a crucial role in promoting the flow of outdoor air into the room.

[0048] Driven by a motor, centrifugal impellers draw outdoor air from the fresh air duct into the volute. During this flow, the air radially flows from the centrifugal impeller's meridian plane into its interior. The rotation of the impeller increases its pressure, causing the air to flow roughly radially and escape from the impeller. However, the air intake heights on the centrifugal impeller vary. This can lead to tip leakage at the top of the blade (front disc), while flow instability and flow separation at the base of the blade (under disc) can lead to vortexes and secondary flows, resulting in airflow loss and noise. After analysis, it is found that for centrifugal fan blades in the existing technology, fan blades with a large width-to-diameter ratio will cause uneven distribution of airflow along the axial direction of the conventional fan blades. The airflow mainly moves axially near the front disk of the impeller. When the airflow moves to the middle disk and the rear disk of the impeller, its main movement is converted into radial flow. The vortex caused by uneven distribution and movement turning is one of the main sources of fan noise. Moreover, since the center angle and spacing of the blade disk are equal, when the fan rotates and works, large periodic pressure pulsations will appear near the volute tongue, causing noise.

[0049] To this end, an embodiment of the present application provides a centrifugal fan blade 10, which aims to solve the problem of flow separation noise existing in the centrifugal fan blade 10 in the prior art.

[0050] This application proposes a centrifugal fan blade 10, such as Figure 1 and Figure 2 As shown, the centrifugal fan blade includes:

[0051] Front disc 100;

[0052] A chassis 200, wherein the chassis 200 and the front disc 100 are spaced apart along the axial direction of the centrifugal fan blade 10;

[0053] A plurality of first fan blades 300 are arranged between the front disk 100 and the chassis 200, and the plurality of first fan blades 300 are arranged at intervals along the circumference of the centrifugal fan blade 10; the first fan blade 300 has a first end 310 close to or connected to the front disk 100 and a second end 320 close to or connected to the chassis 200; the first fan blade 300 extends axially from the first end 310 to the second end 320, and the extension direction of the first fan blade 300 is inclined to the axial direction of the centrifugal fan blade 10.

[0054] In the technical solution of the embodiment of the present application, a plurality of first wind pressures arranged at circumferential intervals along the centrifugal fan blade 10 have an axial first end 310 and a second end 320, and the first fan blade 300 extends axially from the first end 310 to the second end 320, the first end 310 is close to or connected to the front disk 100, and the second end 320 is close to or connected to the chassis 200, and the extension direction of the first fan blade 300 is inclined to the axial direction of the centrifugal fan blade 10, thereby causing the first fan blade 300 to twist, so as to compensate for the defect of uneven air intake of the front disk 100, the middle part of the centrifugal fan blade 10, and the chassis 200 due to different axial air intake heights, so that after the first fan blade 300 is twisted, the air intake of the centrifugal fan blade 10 at different axial positions is more uniform, the flow separation phenomenon in the blade channel is suppressed, the aerodynamic performance is improved, the flow separation noise is reduced, and it helps to increase the air volume of the centrifugal fan blade 10.

[0055] like Figure 3 ,and Figure 4 As shown in the figure, it can be seen from the total pressure diagram that the pressure of the gas in the fan blade area tends to be consistent; it can be seen from the turbulent kinetic energy distribution diagram that the turbulent kinetic energy of the gas in the fan blade area is basically the same.

[0056] It should be noted that the chassis 200 is the structure for connecting the centrifugal blades 10 to the fan and is provided with an axial hole for engaging the fan shaft. The front disc 100 is the structure for airflow to enter the centrifugal blades 10 axially. Airflow enters the hub area of the centrifugal blades 10 axially through the front disc 100. The twisting of the first blades 300 ensures that airflow enters the blade area more evenly and smoothly at all axial heights, reducing pressure pulsation and airflow separation caused by varying axial intake heights, thereby lowering noise.

[0057] As an optional implementation of the above embodiment, Figure 2As shown, the chassis 200 has a disk center 201, the first end 310 has a first curvature center 311, and the second end 320 has a second curvature center 321; the line connecting the first curvature center 311 and the disk center 201 is a first line, and the line connecting the second curvature center 321 and the disk center 201 is a second line. The angle between the first line and the second line is the misalignment angle α of the first curvature center 311 of the first end 310 and the second curvature center 321 of the second end 320 along the circumferential direction, and the value range of the misalignment angle is 1-6°.

[0058] It should be noted that the centrifugal fan blades 10 rotate under the drive of the fan, and their rotation direction is their circumferential direction. Figure 2 As shown, the first curvature center 311 of the first end portion 310 of the same first blade is located upstream of the second curvature center 321 of the second end portion 320 in the rotation direction.

[0059] That is, the second curvature center 321 of the second end portion 320 close to or connected to the chassis 200 is offset by 1-6° relative to the first curvature center 311 of the first end portion 310 close to or connected to the chassis 200 along the circumference of the centrifugal fan blade 10. On the one hand, this facilitates the manufacture of the first fan blade 300, and on the other hand, the airflow distribution within this angle range is more uniform, which can reduce noise.

[0060] In the embodiment, the center of the chassis 200 is on the axis of the centrifugal fan blade 10. Usually, the chassis 200 is a circular disc structure, so the center of the chassis 200 is the center of the circle.

[0061] In some embodiments, the first center of curvature 311 and the second center of curvature 321 are located on the same circumferential line.

[0062] In some embodiments, the cross-sectional shape of the first end portion 310 and the second end portion 320 may be arc-shaped, with the first center of curvature 311 and the second center of curvature 321 being the center of the circle.

[0063] In the technical solution of the above embodiment, the outlet installation angle of the first end 310 is equal to the outlet installation angle of the second end 320. By setting the outlet installation angles of the first end 310 and the second end 320 to be the same, the uniformity of the airflow distribution can be significantly improved. For example, the cross-sectional shapes of the first end 310 and the second end 320 are the same; for another example, the cross-sectional shapes of the first fan blade 300 at any point in the axial direction are the same, that is, the trajectory line formed by the center of curvature on the cross section of the first fan blade 300 is a circular arc line, and the center of the circular arc line is coaxially arranged with the center of the chassis 200 (the projection of the center of the circular arc line on the chassis 200 coincides with the center of the chassis 200).

[0064] As an optional implementation of the above embodiment, Figure 5 、 Figure 6 and Figure 7 As shown, the centrifugal fan blade 10 further includes a plurality of second fan blades 400, which are spaced axially between the chassis 200 and the front disc 100. The second fan blades 400 are vertical fan blades, wherein the plurality of second fan blades 400 are spaced axially from the plurality of first fan blades 300. That is, in this embodiment, the centrifugal fan blade 10 includes two different fan blade types: the first fan blade 300 and the second fan blade type are vertical fan blades. The vertical fan blades differ from the first fan blades 300 in that, when extending axially, the vertical fan blades extend only axially and do not twist circumferentially. The two different fan blade types are spaced axially. By axially staggering the relative positions of the upper and lower fan blades, the actual axial air intake angle of the centrifugal fan blade 10 is adjusted, effectively compensating for the uneven air intake in the front disc 100, the middle portion of the centrifugal fan blade 10, and the chassis 200 caused by different axial air intake heights.

[0065] As an optional implementation of the above embodiment, this embodiment provides a double-layer fan blade structure, such as Figure 5 and Figure 6 As shown, the centrifugal fan blade 10 has a center ring 500, and the front disc 100, the center ring 500, and the chassis 200 are spaced apart along the axial direction. The plurality of second fan blades 400 are connected to the chassis 200 and the center ring 500 at both ends in the axial direction, respectively. The second ends 320 of the plurality of first fan blades 300 are connected to the center ring 500, and the first ends 310 of the plurality of first fan blades 300 are connected to the front disc 100. That is, in this embodiment, the first fan blades 300 are axially connected to the front disc 100, the second fan blades 400 are axially connected to the chassis 200, and the first fan blades 300 and the second fan blades 400 are connected via the center ring 500. This double-layer fan blade structure improves the axial air intake flow of the fan blade by adjusting the actual axial angle of the fan blade through the twisting setting of the first fan blade 300 connected to the front disk 100, so that the air intake in the area close to the front disk 100 is uniform, thereby overcoming the technical problem of easy leakage of air flow at the top due to different axial air intake heights, thereby improving noise.

[0066] In some embodiments, the ratio of the axial height of the first blade 300 to the axial height of the second blade 400 is 2:1-4:1. For example, the ratio of the axial height of the first blade 300 to the axial height of the second blade 400 is 3:1. By setting the axial height of the first blade 300 to 2-4 times the axial height of the second blade 400, the airflow distribution in the area near the front disc 100 of the centrifugal blade 10 is uniform. By uniformizing the airflow in the area near the front disc 100, the airflow near the base 200 is also uniform, thereby improving noise.

[0067] As an optional implementation of the above embodiment, Figure 7 As shown, this embodiment provides a three-layer fan blade structure, the centrifugal fan blade 10 has a first group of first fan blade arrays 301 and a second group of first fan blade arrays 302, the first group of first fan blade arrays 301 and the second group of first fan blade arrays 302 both include the plurality of first fan blades 300; the centrifugal fan blade 10 includes a first support ring 600 and a second support ring 700, the first support ring 600 and the second support ring 700 are arranged between the chassis 200 and the front disk 100 along the axial direction; the first fan blades 301 of the first group of first fan blade arrays 301 are arranged between the chassis 200 and the front disk 100; 00 is connected to the front disk 100, and the second end 320 of the first fan blade 300 of the first group of first fan blade arrays 301 is connected to the first support ring 600; the second fan blade 400 is respectively connected to the first support ring 600 and the second support ring 700 at both ends in the axial direction; the first end 310 of the first fan blade 300 of the second group of first fan blade arrays 302 is connected to the second support ring 700, and the second end 320 of the first fan blade 300 of the second group of first fan blade arrays 302 is connected to the chassis 200. That is, in this embodiment, a group of first fan blades 300 arrays are respectively provided in the front disk 100 area and the chassis 200 area, and a second fan blade 400 is arranged between the two groups of first fan blades 300 arrays, so as to adjust the actual air intake angles in the front disk 100 area and the chassis 200 area respectively by twisting the first fan blades 300, so as to overcome the technical problems that the air flow in the front disk 100 area is easy to leak and the air flow in the chassis 200 area is easy to be unstable, so that the air flow distribution is more uniform and the noise is reduced.

[0068] In some embodiments, the ratio of the axial height of the first blade 300 to the axial height of the second blade 400 is 3:2-3:1. For example, the ratio of the axial height of the first blade 300 to the axial height of the second blade 400 is 2:1. By setting the axial height of the first blade 300 to 2-4 times the axial height of the second blade 400, the centrifugal fan 10 achieves uniform airflow distribution near the front disc 100 and near the base 200. By uniformizing the airflow around the front disc 100 and base 200, the airflow near the central area is also uniform, thereby reducing noise.

[0069] As an optional implementation of the above embodiment, Figure 8 As shown, the center of curvature 401 of the second blade 400 and the first center of curvature 311 of the first end 310 are staggered in the circumferential direction; and / or the center of curvature of the second blade 400 and the second center of curvature 321 of the second end 320 are staggered in the circumferential direction. In this embodiment, the center of curvature of the second blade 400 and the first center of curvature 311 of the first end 310 are staggered along the circumference by 1 to 3 degrees (β), thereby adjusting the air intake angle of the second blade 400 and the first blade 300, promoting uniform air intake flow, achieving effective improvement of internal flow, and at the same time increasing total pressure, reducing turbulent kinetic energy, reducing vortex, and reducing shedding noise; and / or the center of curvature of the second blade 400 and the second center of curvature 321 of the second end 320 are staggered along the circumference by 1 to 3 degrees, thereby achieving effective improvement of internal flow, at the same time increasing total pressure, reducing turbulent kinetic energy, and reducing shedding noise.

[0070] In an embodiment, the center of curvature of the second blade 400 is offset from the first center of curvature 311 of the first end portion 310 by 1°, 1.5°, 2°, 2.5°, or 3° along the circumference. The center of curvature of the second blade 400 is offset from the second center of curvature 321 of the second end portion 320 by 1°, 1.5°, 2°, 2.5°, or 3° along the circumference.

[0071] In some embodiments, such as Figure 8As shown, the center of curvature of the second blade 400 is located between the first center of curvature 311 of the first end 310 of the adjacent first blade 300 and the second center of curvature 321 of the second end 320 of the first blade 300, thereby adjusting the air intake angle. For example, the offset angle between the center of curvature of the second blade 400 and the first center of curvature 311 of the first end 310 of the adjacent first blade 300 and the offset angle between the second center of curvature 321 of the second end 320 of the first blade 300 are equal, that is, the arc length between the center of curvature of the second blade 400 and the first center of curvature 311 of the first end 310 of the adjacent first blade 300 and the second center of curvature 321 of the second end 320 of the first blade 300 are equal.

[0072] As an optional implementation of the above embodiment, the chassis 200 is partially hollowed out 202. In the embodiment, the chassis 200 is partially hollowed out 202, which can save materials and reduce the weight of the centrifugal fan blades while meeting the requirements of reducing noise. Figure 9 As shown, the holes 202 are evenly distributed along the circumference of the chassis 200. The number of the holes 202 is not particularly limited and can be 2, 3, 4 or 5.

[0073] As an alternative embodiment of the above embodiment, the number of the first fan blades 300 is 53. In the prior art, a centrifugal fan has 61 blades. After studying noise and air volume, the inventors of this application determined that the number of the first fan blades can be reduced to 53, thereby achieving the desired effect of reducing noise while maintaining air volume.

[0074] As an optional implementation of the above embodiment, Figure 10 As shown, the present embodiment also provides a fresh air module 1 including centrifugal fan blades 10. The centrifugal fan blades 10 utilize some or all of the technical solutions of the aforementioned embodiments, thereby possessing some or all of the technical advantages of the aforementioned embodiments. This fresh air module 1 offers the technical advantages of high air volume and low noise, thereby reducing indoor noise and improving the air conditioner's ability to introduce fresh air when used in an air conditioner.

[0075] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A centrifugal fan blade, characterized in that: The centrifugal fan blades include: front disc; A chassis, wherein the chassis and the front chassis are spaced apart along the axial direction of the centrifugal fan blade; a plurality of first fan blades are arranged between the front chassis and the chassis, and the plurality of first fan blades are spaced apart along the circumferential direction of the centrifugal fan blade; The first fan blade has a first end close to or connected to the front disk and a second end close to or connected to the base disk; The first fan blade extends from the first end to the second end, and an extending direction of the first fan blade is inclined to an axial direction of the centrifugal fan blade.

2. The centrifugal fan blade according to claim 1, characterized in that: The chassis has a center, the first end has a first center of curvature, and the second end has a second center of curvature; The line connecting the first center of curvature and the disk center is the first line, the line connecting the second center of curvature and the disk center is the second line, and the angle between the first line and the second line is the misalignment angle between the first center of curvature of the first end and the second center of curvature of the second end along the circumference of the centrifugal fan blade, and the value range of the misalignment angle is 1-6°.

3. The centrifugal fan blade according to claim 1 or 2, characterized in that: The outlet installation angle of the first end portion is equal to the outlet installation angle of the second end portion; and / or The first center of curvature of the first end portion of the same first blade is located upstream of the second center of curvature of the second end portion in the rotational direction.

4. The centrifugal fan blade according to claim 1, wherein: The centrifugal fan blades further include a plurality of second fan blades, which are arranged between the base plate and the front plate at intervals along the axial direction; the second fan blades are vertical fan blades; Wherein, the plurality of second fan blades and the plurality of first fan blades are arranged at intervals along the axial direction.

5. The centrifugal fan blade according to claim 4, characterized in that: The centrifugal fan blade has a middle ring, and the front disc, the middle ring and the bottom disc are spaced apart along the axial direction; The plurality of second fan blades are respectively connected to the chassis and the middle ring at both ends in the axial direction; The second ends of the plurality of first fan blades are connected to the middle ring, and the first ends of the plurality of first fan blades are connected to the front disk.

6. The centrifugal fan blade according to claim 5, characterized in that: The ratio of the axial height of the first fan blade to the axial height of the second fan blade is 2:1-4:

1.

7. The centrifugal fan blade according to claim 4, characterized in that: The centrifugal fan blades include a first group of first fan blade arrays and a second group of first fan blade arrays, wherein the first group of first fan blade arrays and the second group of first fan blade arrays both include the plurality of first fan blades; The centrifugal fan blade includes a first support ring and a second support ring, wherein the first support ring and the second support ring are arranged between the base plate and the front plate along the axial direction at intervals; The first ends of the first blades of the first group of first blade arrays are connected to the front disk, and the second ends of the first blades of the first group of first blade arrays are connected to the first support ring; Two ends of the second fan blade in the axial direction are respectively connected to the first support ring and the second support ring; The first ends of the first blades of the second group of first blade arrays are connected to the second support ring, and the second ends of the first blades of the second group of first blade arrays are connected to the chassis.

8. The centrifugal fan blade according to claim 7, characterized in that: The ratio of the axial height of the first fan blade to the axial height of the second fan blade is 3:2-3:

1.

9. The centrifugal fan blade according to claim 4, characterized in that: The center of curvature of the second fan blade and the first center of curvature of the first end are staggered in the circumferential direction; and / or the center of curvature of the second fan blade and the second center of curvature of the second end are staggered in the circumferential direction.

10. The centrifugal fan blade according to claim 1, wherein: The chassis is partially hollowed out.

11. The centrifugal fan blade according to claim 1, wherein: The number of the first fan blades is 53.

12. A fresh air module, characterized in that: The centrifugal fan blade comprises the centrifugal fan blade according to any one of claims 1 to 11.

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