Centrifugal fan blades, ceiling fan, and molding methods for centrifugal fan blades

Abstract

This application relates to a centrifugal fan blade, a ceiling fan, and a method for molding the centrifugal fan blade. The centrifugal fan blade includes: a front plate with an air inlet; a rear plate coaxial with the front plate and spaced apart; and multiple blades located between the front and rear plates, the multiple blades being arranged circumferentially and spaced apart, with an outlet channel formed between adjacent blades. In the axial direction of the centrifugal fan blade, the leading edges of the multiple blades form an inlet circle with a first preset diameter, and the trailing edges of the multiple blades form an outlet circle with a second preset diameter. The leading edges of the blades form a preset inlet angle relative to the inlet circle, and the trailing edges of the blades form a preset outlet angle relative to the outlet circle, so that the front plate, rear plate, and multiple blades are integrally molded. This method for molding the centrifugal fan blade, ceiling fan, and centrifugal fan blade can improve the aerodynamic performance of the fan blade, increase air volume, reduce noise, and meet the requirements for integral demolding.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a centrifugal fan blade, a ceiling fan, and a method for molding the centrifugal fan blade. Background Technology

[0002] Ceiling-mounted or recessed air conditioners, also known as ceiling-mounted units, are increasingly favored by consumers due to their long air delivery distance, attractive appearance, and space-saving design. The working principle of a ceiling-mounted unit involves the airflow being directed by a backward-facing centrifugal fan. After a 90° turn, the airflow exits from the fan outlet, flows through the heat exchanger, and then is deflected another 90° before being blown out through the outlet duct. The centrifugal fan, as a crucial component, significantly impacts the aerodynamic performance and noise level of the ceiling-mounted unit. Currently, the industry commonly employs gas-assisted molding + ultrasonic welding, or separate mold opening + ultrasonic welding designs, which not only result in higher production costs but also leave room for improvement in aerodynamic performance and noise levels. Summary of the Invention

[0003] The purpose of this application is to provide a method for molding a centrifugal fan blade, a ceiling fan, and a centrifugal fan blade, which can improve the aerodynamic performance of the fan blade, increase air volume, reduce noise, and meet the requirements for one-piece demolding.

[0004] Therefore, in a first aspect, embodiments of this application provide a centrifugal fan blade, the centrifugal fan blade comprising:

[0005] The front panel has an air intake.

[0006] The rear disc, coaxial with and spaced apart from the front disc; and

[0007] Multiple blades are located between the front plate and the rear plate, and the multiple blades are arranged at intervals along the circumference, and a blade outlet is formed between two adjacent blades;

[0008] In the axial direction of the centrifugal fan blade, the leading edge of the plurality of blades forms an inlet circle with a first preset diameter, the trailing edge of the plurality of blades forms an outlet circle with a second preset diameter, and the leading edge of the blade forms a preset inlet angle relative to the inlet circle, and the trailing edge of the blade forms a preset outlet angle relative to the outlet circle, so that the front plate, the rear plate and the plurality of blades are integrally formed.

[0009] In one possible implementation, the first preset diameter is D1, the second preset diameter is D2, the preset inlet angle is α, and the preset outlet angle is β.

[0010] The first preset diameter D1, the second preset diameter D2, the preset inlet angle α, and the preset outlet angle β satisfy the following conditions: 260mm < D1 < 400mm, 400mm < D2 < 500mm, 0° < α < 20°, 40° < α + β < 65°.

[0011] In one possible implementation, a first cross-section and a second cross-section are made in the axial direction of the centrifugal fan blades, with the first cross-section located on the side of the second cross-section closer to the air inlet.

[0012] The first preset diameter of the inlet circle located in the first cross-section is greater than or equal to the first preset diameter of the inlet circle located in the second cross-section, and the preset inlet angle located in the first cross-section is greater than or equal to the preset inlet angle located in the second cross-section.

[0013] In one possible implementation, in the first cross-section, the blade has a first blade trajectory. Along the extension direction from the leading edge to the trailing edge of the blade, the first blade trajectory has a first centerline. The first centerline and the first blade trajectory have a first intersection point and a second intersection point. The first preset diameter of the inlet circle formed by a plurality of the first intersection points is a first diameter D11, and the second preset diameter of the outlet circle formed by a plurality of the second intersection points is a second diameter D12, where D11 < D12. At the first intersection point, the first centerline has a first tangent, and the inlet circle has a second tangent. The included angle between the first tangent and the second tangent is a first included angle α1, and the first included angle α1 is the preset inlet angle located in the first cross-section.

[0014] In the second cross-section, the blade has a second blade trajectory. Along the extension direction from the leading edge to the trailing edge of the blade, the second blade trajectory has a second centerline. The second centerline intersects the second blade trajectory at a third point and a fourth point. The first predetermined diameter of the inlet circle formed by the plurality of third intersection points is a third diameter D21, and the second predetermined diameter of the outlet circle formed by the plurality of fourth intersection points is a fourth diameter D22, where D21 < D22 and D11 ≥ D21. At the third intersection point, the second centerline has a third tangent, and the inlet circle has a fourth tangent. The included angle between the third and fourth tangents is a second included angle α2, which is the predetermined inlet angle located in the second cross-section.

[0015] Among them, 5°<α1<20°, 0°<α2<15°, 300mm<D11<400mm, 260mm<D21<350mm, 400mm<D12<500mm, and 400mm<D22<500mm.

[0016] In one possible implementation, at the second intersection, the first centerline has a fifth tangent, the exit circle has a sixth tangent, and the included angle between the fifth tangent and the sixth tangent is a third included angle β1, the third included angle β1 being the preset exit angle located in the first cross-section;

[0017] At the fourth intersection point, the second centerline has a seventh tangent, the exit circle has an eighth tangent, and the included angle between the seventh tangent and the eighth tangent is the fourth included angle β2. The fourth included angle β2 is the preset exit angle located in the second cross section, D12=D22, β1=β2.

[0018] In one possible implementation, the preset inlet angle and the preset outlet angle satisfy the following conditions: 45°<α1+β1<65°, 40°<α2+β2<60°.

[0019] In one possible implementation, the first blade trajectory and the second blade trajectory are smoothly connected along the axial direction to form the blade.

[0020] In one possible implementation, a third cross-section is provided between the first cross-section and the second cross-section along the axial direction. The third cross-section is a first distance A1 from the second cross-section and a second distance A2 from the first cross-section, where A1 > A2.

[0021] The third cross section has a third blade trajectory, which is the same as the second blade trajectory, and the first blade trajectory, the third blade trajectory, and the second blade trajectory are smoothly connected.

[0022] In one possible implementation, the air inlet has an air inlet diameter that is larger than the first preset diameter and smaller than the second preset diameter.

[0023] Secondly, embodiments of this application provide a ceiling fan, including centrifugal fan blades as described above.

[0024] Thirdly, embodiments of this application provide a method for forming a centrifugal fan blade, the centrifugal fan blade comprising:

[0025] The front panel has an air intake.

[0026] The rear disc, coaxial with and spaced apart from the front disc; and

[0027] Multiple blades are located between the front plate and the rear plate, and the multiple blades are arranged at intervals along the circumference, and a blade outlet is formed between two adjacent blades;

[0028] The molding method includes:

[0029] The front disc, the rear disc, and the plurality of blades are integrally formed;

[0030] The formed blades are arranged such that, along the axial direction of the centrifugal fan blade, the leading edge of the multiple blades forms an inlet circle with a first preset diameter, the trailing edge of the multiple blades forms an outlet circle with a second preset diameter, and the leading edge of the blades has a preset inlet angle with the inlet circle, and the trailing edge of the blades has a preset outlet angle with the outlet circle.

[0031] According to the centrifugal fan blade, ceiling fan, and centrifugal fan blade forming method provided in the embodiments of this application, the centrifugal fan blade is designed by defining the diameters of the inlet and outlet circles formed by the leading and trailing edges of multiple blades along the length direction as a first preset diameter and a second preset diameter, and defining a preset inlet angle for the leading edge of the blade according to the inlet circle of the first preset diameter, and a preset outlet angle for the trailing edge of the blade according to the outlet circle of the second preset diameter. This design allows the formed blade to have structural features that improve efficiency and reduce noise, while enabling demolding during the integral forming of the front plate, rear plate, and multiple blades. This allows the formed centrifugal fan blade to be integrally formed to save costs, while improving aerodynamic performance, increasing airflow, reducing noise, and improving fan efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0033] Figure 1 This illustration shows a cross-sectional view of a centrifugal fan blade assembled on a ceiling fan according to an embodiment of this application, wherein the direction indicated by arrow H is the axial direction;

[0034] Figure 2 This illustration shows a schematic diagram of a centrifugal fan blade structure provided in an embodiment of this application, wherein the direction indicated by arrow H is the axial direction;

[0035] Figure 3 This image shows a front view of a centrifugal fan blade provided in an embodiment of this application, wherein the direction indicated by arrow H is the axial direction;

[0036] Figure 4 Show Figure 3 AA section view of the L1 cross section;

[0037] Figure 5 Show Figure 4 A magnified view of a portion of the image;

[0038] Figure 6 Show Figure 3 VV cross-section view of the L2 section;

[0039] Figure 7 Show Figure 6 A magnified view of a portion of the image;

[0040] Figure 8 This diagram illustrates a partial structural schematic of a centrifugal fan blade according to an embodiment of this application.

[0041] Figure 9 A flowchart illustrating a method for forming a centrifugal fan blade according to an embodiment of this application is shown;

[0042] Figure 10 This diagram shows a comparison of airflow between a centrifugal fan blade in use and a centrifugal fan blade in the prior art moving at the same rotation speed, according to an embodiment of this application.

[0043] Figure 11 This paper presents a noise comparison diagram between a centrifugal fan blade provided in this application embodiment and a centrifugal fan blade in the prior art at the same air volume.

[0044] Figure 12 This diagram shows a power comparison between a centrifugal fan blade provided in this application embodiment and a centrifugal fan blade in the prior art with the same air volume. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Figure 1 This is a cross-sectional view of a centrifugal fan blade assembled on a ceiling fan according to an embodiment of this application. Figure 2 This diagram illustrates a centrifugal fan blade structure provided in an embodiment of this application. Figure 3 This is a front view of a centrifugal fan blade provided in an embodiment of this application. Figure 4 Show Figure 3Section AA of cross section L1. The direction indicated by arrow H is the axial direction, which will not be emphasized separately thereafter.

[0047] See Figure 1 and Figure 2 This application provides a centrifugal fan blade, including: a front disc 22 with an air inlet 21; a rear disc 23 coaxial with the front disc 22 and spaced apart; and multiple blades 24 located between the front disc 22 and the rear disc 23, with the multiple blades 24 arranged circumferentially at intervals, and a blade outlet 25 formed between two adjacent blades 24. Specifically, the front disc 22 is an annular structure with an air inlet 21, and the inner ring of the front disc 22 corresponding to the air inlet 21 has an arc-shaped angle, which extends in a direction away from the rear disc 23 to cooperate with the guide ring 3. The rear disc 23 includes an integrally formed annular cover plate 232 and a hub 231, the hub 231 being connected to the inner ring sidewall of the annular cover plate 232, and the hub 231 protruding towards the front disc 22.

[0048] When the centrifugal fan blade 2 is assembled into the joist 100, the edge of the arc-shaped corner of the front disc 22 is connected to the guide ring 3 in the housing 1 of the joist 100. The air inlet 21 is used to enter air parallel to the axial direction H. Multiple blade outlets 25 are uniformly distributed circumferentially between the front disc 22, the rear disc 23, and multiple blades 24. The blade outlets 25 are located in the gaps between adjacent blades 24. The air discharged through the blade outlets 25 flows along the set flow channel, and in this process, the temperature of the air is changed by the damping component 4, heat exchange component 5, etc., and finally discharged from the air outlet 11 after a 180° turn in the flow channel, thereby achieving the purpose of cooling or heating. The air outlet 11 and the air inlet 21 are located on the same side of the joist 100, and the air directions of the air inlet 21 and the air outlet 11 are opposite (see...). Figure 1 The arrows indicating the corresponding air vent locations are shown in the image (the direction is not detailed here).

[0049] It is understood that multiple blades 24 are evenly arranged circumferentially along the axis of the air inlet 21. Optionally, the number of blades 24 may include multiple blades, such as five, six, or seven, which can be adapted to actual needs and are not specifically limited here. This application takes six blades as an example, but it is not limited to this.

[0050] Optionally, the hub 231 is smoothly connected to the annular cover plate 232, and the hub 231 is provided with heat dissipation holes 231a. The hub 231 and the annular cover plate 232 are coaxial, and the axis of the annular cover plate 232 coincides with the axis of the air inlet 21. The maximum diameter of the hub 231 is smaller than the diameter of the air inlet 21.

[0051] Optionally, the outer diameter of the front disc 22 is the same as the outer diameter of the annular cover 232.

[0052] In this centrifugal fan 2, multiple blades 24 are arranged along the axial direction H. The leading edges of the multiple blades 24 form inlet circles with a first preset diameter, and the trailing edges of the multiple blades 24 form outlet circles with a second preset diameter. The leading edges of the blades 24 form a preset inlet angle relative to the inlet circles, and the trailing edges of the blades 24 form a preset outlet angle relative to the outlet circles. In this centrifugal fan 2, the formed blades 24 are designed such that the diameters of the inlet and outlet circles formed at both ends of the extension direction from the leading to the trailing edge of the multiple blades 24 are defined as the first and second preset diameters, respectively. Furthermore, a preset inlet angle is defined for the leading edge of the blade 24 relative to the inlet circle with the first preset diameter, and a preset outlet angle is defined for the trailing edge of the blade 24 relative to the outlet circle with the second preset diameter. This design results in blades 24 with structural features that improve efficiency and reduce noise, and the centrifugal fan 2 improves aerodynamic performance, increasing airflow, reducing noise, and enhancing fan efficiency.

[0053] In an optional embodiment, the front disc 22, rear disc 23, and multiple blades 24 are integrally injection molded, changing the commonly used production scheme of gas-assisted molding + ultrasonic welding or separate mold opening + ultrasonic welding, thereby saving production costs and improving production efficiency. Furthermore, by defining the characteristics of the blades 24 as described above, the integrally molded centrifugal fan blade 2 can meet the mold opening requirements while also possessing structural features such as improved efficiency and noise reduction, thereby enhancing aerodynamic performance.

[0054] Optionally, the first preset diameter is D1, the second preset diameter is D2, the preset inlet angle is α, and the preset outlet angle is β. The first preset diameter D1, the second preset diameter D2, the preset inlet angle α, and the preset outlet angle β satisfy the following conditions: 260mm < D1 < 400mm, 400mm < D2 < 500mm, 0° < α < 20°, 40° < α + β < 65°. By limiting the first preset diameter D1, the second preset diameter D2, the preset inlet angle α, and the preset outlet angle β corresponding to the leading and trailing edges of the blades to the above ranges, it is ensured that the centrifugal fan blades have good demolding effect during one-piece injection molding, while also possessing aerodynamic performance characteristics such as increased airflow, reduced noise, and improved fan efficiency.

[0055] In an optional embodiment, along the axial direction H, in multiple cross-sections of multiple blades 24 at different blade height positions, the first preset diameter of the inlet circle is the same, and the preset inlet angle of the blades 24 according to the first preset diameter is the same. This ensures that the blades 24, while meeting the mold opening requirements for the integral injection molding of the centrifugal fan blade 2, also have a good guiding effect on the air entering from the air inlet 21, reducing noise and improving aerodynamic performance.

[0056] In one optional embodiment, along the axial direction H, in multiple cross-sections of multiple blades 24 at different blade height positions, the first preset diameter of the inlet circle is different, and the preset inlet angle between the leading edge of the blade 24 and the inlet circle of the first preset diameter is different. By setting different structures for the first preset diameter and the preset inlet angle, the integrally formed blade 24 can have structural features such as twisted angles and concavities that improve efficiency and reduce noise. Furthermore, it can effectively divert and guide the air entering from the air inlet 21, reducing the impact of the inlet air in the axial direction H.

[0057] Optionally, along the axial direction H, and along the blade 24 from one side of the air inlet 21 to the side away from the air inlet 21, the first preset diameter decreases and the first preset included angle decreases.

[0058] In one optional embodiment, the outer diameter of the front disc 22 is set to be the same as the outer diameter of the annular cover plate 232. In order to facilitate the positioning of the multiple blades 24 and reduce the molding difficulty, the exit circle of the second preset diameter of the trailing edge of the multiple blades 24 is set to be the same as the outer diameter of the front disc 22 and the annular cover plate 232, but it is not limited to this and will not be described in detail here.

[0059] It is understandable that, for the inlet and outlet circles of the multiple blades 24, the design of the first preset diameter, preset inlet angle, second preset diameter, and preset outlet angle in different cross-sections can be chosen to be the same or different depending on the actual situation. Furthermore, when actually forming multiple blades 24, one or more cross-sections can be selected as the main section, and corresponding blade trajectories can be formed in the corresponding cross-sections according to the above-mentioned limitations. Then, the blade 24 is formed by smoothly connecting the blade trajectories along the axial direction H.

[0060] Optionally, when the first preset diameter, preset inlet angle, second preset diameter, and preset outlet angle are designed to be the same, a cross-section can be made at any height position along the axial direction H between the front disc 22 and the rear disc 23. The blade trajectory is formed according to the corresponding design in this cross-section, and the blade trajectory extends along the axial direction H to connect to the front disc 22 and the rear disc 23 to form the blade 24.

[0061] When the design is different, multiple cross-sections can be set to form different blade trajectories based on different preset diameters, preset inlet angles, and preset outlet angles. These different blade trajectories are then connected in a certain way to form blade 24. It is understood that the selected cross-sections can be chosen according to requirements. For example, a cross-section can be selected at a point where blade 24 intersects with the front disc 22, a cross-section at a point where blade 24 intersects with the rear disc 23, or a cross-section located between the front disc 22 and the rear disc 23 at a preset distance from the rear disc 23. The selected cross-sections can include any combination of the above or combinations of other cross-sections, etc., and are not specifically limited here.

[0062] Optionally, when the first preset diameter, preset inlet angle, second preset diameter, and preset outlet angle are designed to be different, at least two cross-sectional blade trajectories are required to obtain the structure of the blade 24. A first cross-section L1 and a second cross-section L2 are made at both ends along the height direction of the blade 24. The first cross-section L1 is located on the side of the second cross-section L2 closer to the air inlet 21. The first preset diameter at the first cross-section L1 is greater than or equal to the first preset diameter at the second cross-section L2, and the preset inlet angle at the first cross-section L1 is greater than or equal to the preset outlet angle at the second cross-section L2. This design ensures one-piece molding while improving aerodynamic performance and reducing the complexity and difficulty of forming the blade 24.

[0063] Optionally, a third cross section, a fourth cross section, etc., located at a preset distance between the first cross section L2 and the second cross section L3 can also be made. The blade trajectory in the cross section can be the same as the first adjacent cross section L1 or the second cross section L2, or it can be different from both the adjacent first cross section L1 and the second cross section L2. No specific limitation is made here.

[0064] It should be understood that due to the complex internal flow within the centrifugal fan blade 2, the resulting blade 24 is also affected by various other factors, such as the design of the pressure and suction surfaces within the blade 24. The design of other parts can be the same as in the prior art. This application only specifically describes features related to the technical problem to be solved by the embodiments of this application. Changes in the shape of other parts of the blade 24 caused by other factors only need to ensure that the final blade 24 at least meets the above-mentioned limitations, and will not be described in detail here.

[0065] The following provides a detailed description of the specific structure and forming method of the multiple blades 24 formed in the centrifugal fan blade 2.

[0066] See Figures 3 to 8In the embodiments of this application, the multiple blades 24 in the centrifugal fan blade 2 are obtained at least through the blade trajectories in the first cross section L1 and the second cross section L2. The first cross section L1 is a section perpendicular to the axial direction H made at the intersection of the blade 24 and the front plate 22, and the second cross section L2 is a section perpendicular to the axial direction H made at the intersection of the blade 24 and the rear plate 23.

[0067] Optionally, the number and twist angle of the multiple blades 24 can be limited according to actual needs, and will not be described in detail here. In this embodiment, the number of blades 24 is six, and the twist angle is greater than 0° so that the centerline of the blade 24 extending from the leading edge to the trailing edge is a mid-arc line in the cross-section. It can be understood that the twist angle can also be set to 0°, so that the centerline of the blade 24 is a straight line segment in the cross-section, and will not be specifically limited here.

[0068] It is understandable that the centerline of blade 1 is determined according to the specific formation structure of the pressure surface and suction surface of the blade. In each cross section, the trajectory corresponding to the pressure surface and the trajectory corresponding to the suction surface are obtained by connecting multiple points that are equidistant from the centerline, and are defined by the leading edge and the trailing edge. This will not be explained in detail here.

[0069] In an alternative embodiment, see Figure 4 and Figure 5 In the first cross section L1, the blade 24 has a first blade trajectory 241. Along the extension direction from the leading edge to the trailing edge of the blade 24, the first blade trajectory 241 has a first centerline B1. The first centerline B1 and the first blade trajectory 241 have a first intersection point 241a and a second intersection point 241b. The first preset diameter of the inlet circle formed by the plurality of first intersection points 241a is the first diameter D11. The second preset diameter of the outlet circle formed by the plurality of second intersection points 241b is the second diameter D12, where D11 < D12. At the first intersection point 241a, the first centerline B1 has a first tangent m1, and the inlet circle has a second tangent m2. The included angle between the first tangent m1 and the second tangent m2 is the first included angle α1. The first included angle α1 is a preset inlet angle located in the first cross section L1.

[0070] See Figure 6 and Figure 7In the second cross section L2, the blade 24 has a second blade trajectory 242. Along the extension direction from the leading edge to the trailing edge of the blade 24, a second centerline B2 of the second blade trajectory 242 is drawn. The second centerline B2 and the second blade trajectory 242 have a third intersection point 242a and a fourth intersection point 242b. The diameter of the inlet circle formed by the multiple third intersection points 242a is the third diameter D21, and the diameter of the outlet circle formed by the multiple fourth intersection points 242b is the fourth diameter D22, where D21 < D22 and D11 ≥ D21. At the third intersection point 242a, the second centerline B2 has a third tangent m5, and the inlet circle has a fourth tangent m6. The included angle between the third tangent m5 and the fourth tangent m6 is the second included angle α2, which is a preset inlet angle located in the second cross section L2.

[0071] In an optional embodiment, at the second intersection 241b, the first centerline B1 has a fifth tangent m3, the second circle has a sixth tangent m4, and the included angle between the fifth tangent m3 and the sixth tangent m4 is a third included angle β1, which is a preset exit angle located at the first cross-section L1; at the fourth intersection 242b, the second centerline B2 has a seventh tangent m7, the fourth circle has an eighth tangent m8, and the included angle between the seventh tangent m7 and the eighth tangent m8 is a fourth included angle β2, which is a preset exit angle located at the second cross-section L2, where D12 = D22 and β1 = β2.

[0072] Among them, 5°<α1<20°, 0°<α2<15°, 300mm<D11<400mm, 260mm<D21<350mm, 400mm<D12<500mm, and 400mm<D22<500mm.

[0073] Optionally, the preset inlet angle and preset outlet angle in each cross section satisfy the following conditions: 45°<α1+β1<65°, 40°<α2+β2<60°.

[0074] It is understandable that when the blade 24 is formed solely by the first blade trajectory 241 and the second blade trajectory 242 (excluding the influence of design factors related to the formation of other blades such as pressure surface and suction surface), the first blade trajectory 241 and the second blade trajectory 242 can be smoothly connected along the axial direction H to form the blade 24.

[0075] In an alternative embodiment, see Figure 8Along the axial direction H, a third cross section L3 is provided between the first cross section L1 and the second cross section L2. The third cross section L3 is a first distance A1 from the second cross section L2, and a second distance A2 from the first cross section L1, where A1 > A2. The third cross section L3 has a third blade trajectory, which is the same as the second blade trajectory 242. The first blade trajectory 241, the third blade trajectory, and the second blade trajectory 242 are smoothly connected. Optionally, the selected third cross section L3 can be limited according to requirements. Based on the rear disc 23, the third cross section L3 can be set at one-third of the overall height of the blade 24, but it is not limited to this.

[0076] Optionally, the trajectory of the third blade of the third cross section L3 can also be set to be different from both the trajectory of the first blade 241 and the trajectory of the second blade 242, without any specific limitation here.

[0077] It is understandable that it may also include the trajectory of the fourth blade on the fourth cross section, the trajectory of the fifth blade on the fifth cross section, etc. Similarly, the corresponding blade trajectory may be the same as the trajectory on one side and different on the other side, or it may be a structure where the trajectories on both adjacent sides are different. No specific limitation is made here.

[0078] In one optional embodiment, the air inlet 21 has an air inlet diameter that is larger than a first preset diameter and smaller than a second preset diameter. This allows the designed blades 24 to have better airflow guidance while reducing noise.

[0079] This application embodiment also provides a method for forming a centrifugal fan blade, used to form the centrifugal fan blade 2 described above.

[0080] See Figure 9 The molding methods include:

[0081] S101, the front disc, rear disc and multiple blades are integrally formed.

[0082] S102. The formed multiple blades are arranged such that, along the axial direction of the centrifugal fan blade, the leading edge of the multiple blades forms an inlet circle with a first preset diameter, the trailing edge of the multiple blades forms an outlet circle with a second preset diameter, and the leading edge of the blades forms a preset inlet angle relative to the inlet circle, and the trailing edge of the blades forms a preset outlet angle relative to the outlet circle.

[0083] In an optional embodiment, the molding method further includes, before molding, acquiring a first blade trajectory and a second blade trajectory for forming blades, and establishing a molding mold, so that during molding, at least a plurality of blades are obtained based on the first blade trajectory and the second blade trajectory of the molding mold.

[0084] It is understood that the specific methods for obtaining the first blade trajectory, the second blade trajectory, or other cross-sectional blade trajectories for forming the required blades during integral molding can be found in the centrifugal fan blade section described in the above embodiments, and will not be repeated here. It is also known that, to facilitate mold opening during integral molding, the blade section can be fabricated using the blade trajectory for forming the blades during mold preparation, and will not be repeated here.

[0085] See Figures 10 to 12 The above-described centrifugal fan blade test results are compared with the original centrifugal fan blade data. According to the data comparison, the fan blade provided in this embodiment has a higher air volume of 100 m3 / h at the same rotation speed compared with the original fan blade; a lower noise level of 1.5 dB at the same air volume compared with the original fan blade; and a lower power consumption of 5 W at the same air volume compared with the original fan blade. This effectively improves the aerodynamic performance of the centrifugal fan blade, increases air volume, reduces noise, and improves fan efficiency.

[0086] This application also provides a ceiling-mounted air conditioner for use in unitary systems, multi-split systems, etc. The ceiling-mounted air conditioner includes the centrifugal fan blades described above, which will not be described in detail here. This ceiling-mounted air conditioner can be applied to indoor spaces with ventilation and heat exchange requirements, and is not specifically limited here.

[0087] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0088] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0089] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A centrifugal fan blade, characterized in that, include: The front panel has an air intake. The rear disc is coaxial with and spaced apart from the front disc; as well as Multiple blades are located between the front plate and the rear plate, and the multiple blades are arranged at intervals along the circumference, and a blade outlet is formed between two adjacent blades; In the axial direction of the centrifugal fan blade, the leading edge of the plurality of blades forms an inlet circle with a first preset diameter, the trailing edge of the plurality of blades forms an outlet circle with a second preset diameter, and the leading edge of the blade forms a preset inlet angle relative to the inlet circle, and the trailing edge of the blade forms a preset outlet angle relative to the outlet circle, so that the front plate, the rear plate and the plurality of blades are integrally formed. The first preset diameter is D1, the second preset diameter is D2, the preset inlet angle is α, and the preset outlet angle is β. The first preset diameter D1, the second preset diameter D2, the preset inlet angle α, and the preset outlet angle β satisfy the following conditions: 260mm < D1 < 400mm, 400mm < D2 < 500mm, 0° < α < 20°, 40° < α + β < 65°. A first cross-section and a second cross-section are made along the axial direction of the centrifugal fan blade, with the first cross-section located on the side of the second cross-section closer to the air inlet. The first preset diameter of the inlet circle located in the first cross-section is greater than or equal to the first preset diameter of the inlet circle located in the second cross-section, and the preset inlet angle located in the first cross-section is greater than or equal to the preset inlet angle located in the second cross-section.

2. The centrifugal fan blade according to claim 1, characterized in that, In the first cross-section, the blade has a first blade trajectory. Along the extension direction from the leading edge to the trailing edge of the blade, the first blade trajectory has a first centerline. The first centerline and the first blade trajectory have a first intersection point and a second intersection point. The first preset diameter of the inlet circle formed by a plurality of first intersection points is a first diameter D11, and the second preset diameter of the outlet circle formed by a plurality of second intersection points is a second diameter D12, where D11 < D12. At the first intersection point, the first centerline has a first tangent, and the inlet circle has a second tangent. The included angle between the first tangent and the second tangent is a first included angle α1, and the first included angle α1 is the preset inlet angle located in the first cross-section. In the second cross-section, the blade has a second blade trajectory. Along the extension direction from the leading edge to the trailing edge of the blade, the second blade trajectory has a second centerline. The second centerline and the second blade trajectory have a third intersection point and a fourth intersection point. The diameter of the inlet circle formed by the plurality of third intersection points is a third diameter D21, and the diameter of the outlet circle formed by the plurality of fourth intersection points is a fourth diameter D22, where D21 < D22 and D11 ≥ D21. At the third intersection point, the second centerline has a third tangent, and the inlet circle has a fourth tangent. The included angle between the third and fourth tangents is a second included angle α2, which is the preset inlet angle located in the second cross-section. Among them, 5°<α1<20°, 0°<α2<15°, 300mm<D11<400mm, 260mm<D21<350mm, 400mm<D12<500mm, and 400mm<D22<500mm.

3. The centrifugal fan blade according to claim 2, characterized in that, At the second intersection, the first centerline has a fifth tangent, the exit circle has a sixth tangent, and the included angle between the fifth tangent and the sixth tangent is a third included angle β1, which is the preset exit angle located in the first cross section; At the fourth intersection point, the second centerline has a seventh tangent, the exit circle has an eighth tangent, and the included angle between the seventh tangent and the eighth tangent is the fourth included angle β2. The fourth included angle β2 is the preset exit angle located in the second cross section, D12=D22, β1=β2.

4. The centrifugal fan blade according to claim 3, characterized in that, The preset inlet angle and the preset outlet angle satisfy the following conditions: 45°<α1+β1<65°, 40°<α2+β2<60°.

5. The centrifugal fan blade according to claim 2, characterized in that, Along the axial direction, the first blade trajectory and the second blade trajectory are smoothly connected to form the blade.

6. The centrifugal fan blade according to claim 2, characterized in that, Along the axial direction, a third cross-section is provided between the first cross-section and the second cross-section. The third cross-section is a first distance A1 from the second cross-section and a second distance A2 from the first cross-section, where A1 > A2. The third cross section has a third blade trajectory, which is the same as the second blade trajectory, and the first blade trajectory, the third blade trajectory, and the second blade trajectory are smoothly connected.

7. The centrifugal fan blade according to any one of claims 1-6, characterized in that, The air inlet has an air inlet diameter that is larger than the first preset diameter and smaller than the second preset diameter.

8. A ceiling machine, characterized in that, Includes the centrifugal fan blade as described in any one of claims 1-7.

9. A method for forming a centrifugal fan blade, characterized in that, The method for forming the centrifugal fan blade according to any one of claims 1-7 includes: The front disc, the rear disc, and the plurality of blades are integrally formed; The formed blades are arranged such that, along the axial direction of the centrifugal fan blade, the leading edge of the multiple blades forms an inlet circle with a first preset diameter, the trailing edge of the multiple blades forms an outlet circle with a second preset diameter, and the leading edge of the blades forms a preset inlet angle relative to the inlet circle, and the trailing edge of the blades forms a preset outlet angle relative to the outlet circle.

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