Cross-flow fan blades, air duct structure, indoor air conditioning unit and air conditioning equipment

Abstract

This invention relates to a cross-flow fan blade, an air duct structure, an indoor air conditioning unit, and an air conditioning device. The cross-flow fan blade includes multiple blades and multiple guide vanes; the multiple blades are arranged at intervals along a circumference; a guide vane is disposed between every two adjacent blades; along the radial direction of the circumference, the blades and guide vanes have distal and proximal ends; the distance from the distal end of the guide vane to the center of the circumference is less than the distance from the distal end of the blade to the center of the circumference. The placement of guide vanes between every two adjacent blades in the aforementioned cross-flow fan blade increases the working area of ​​the blades, reduces the velocity gradient of the airflow at the blade tails, and reduces the vortex noise exhibited by the cross-flow fan blade; it also increases the contact area with the airflow, improving air delivery capacity; simultaneously, by setting the distal ends of the multiple blades and multiple guide vanes in a wavy or toothed shape, it helps to mitigate rotational noise generated by the collision between the airflow and the volute tongue during the rotation of the cross-flow fan blade.

Description

Technical Field

[0001] This invention relates to the technical field of air conditioning, and more particularly to a cross-flow fan blade, air duct structure, indoor air conditioning unit, and air conditioning equipment. Background Technology

[0002] The indoor unit of an air conditioner has an air duct structure for ventilation. The air duct structure of the indoor unit mainly includes a bottom shell, a heat exchanger, cross-flow fan blades, and a volute. The cross-flow fan blades are composed of multiple middle fan blades, end covers, and shaft covers. The middle fan blades include a disc and multiple blades that are not evenly distributed along the circumference.

[0003] During operation, the airflow of the cross-flow fan blades in the indoor unit of an air conditioner enters and exits between the blades twice. The blade separation in the intake area causes the greatest airflow loss. Simulation results show that on the inlet side, the airflow begins to separate from the blade surface at the maximum thickness of the cross-flow fan blades, forming a significant low-speed vortex region along the blade's maximum thickness. This also results in a large velocity gradient of the airflow entering the fan interior at the blade's tail. These factors increase the air conditioner's power consumption and amplify its vortex noise. Summary of the Invention

[0004] This invention provides a cross-flow fan blade, a duct structure, an indoor air conditioning unit, and an air conditioning device to solve the technical problem of various noises generated in the duct of the existing indoor air conditioning unit.

[0005] The cross-flow fan blade provided by the present invention includes a plurality of blades and a plurality of guide vanes; the plurality of blades are arranged sequentially at intervals in a circumferential direction; a guide vane is disposed between every two adjacent blades; along the radial direction of the circumference, the blades and the guide vanes have distal ends and proximal ends; the distance from the distal end of the guide vane to the center of the circumference is less than the distance from the distal end of the blade to the center of the circumference.

[0006] Wherein, along the direction from the distal end to the proximal end of the blade, the thickness of the blade has a shape structure that first increases and then decreases; the distance from the distal end of the guide plate to the center of the circumference is less than the distance from the distal end of the blade to the center of the circumference, but greater than the distance from the widest point of the blade to the center of the circumference.

[0007] Wherein, the angle of the blade on the circumference is the wrap angle of the blade, the angle of the guide plate on the circumference is the wrap angle of the guide plate, and the wrap angle of the guide plate is smaller than the wrap angle of the blade.

[0008] Wherein, the angle that the blade has on the circumference is the wrap angle of the blade, the side of the blade facing the center of the circumference is the inner side, and the side facing away from the center of the circumference is the outer side; among two adjacent blades, the one with its inner side facing the guide plate between the two blades is the first blade, and the one with its outer side facing the guide plate between the two blades is the second blade; the distal end of each guide plate is outside the wrap angle of the adjacent first blade, and the proximal end is inside the wrap angle of the adjacent first blade, and the angle between the proximal end and the center of the circumference and the distal end of the first blade and the center of the circumference is less than half of the wrap angle of the first blade.

[0009] Among them, the angle between the far end of one of the two adjacent guide vanes and the center of the circumference is the angle between the two adjacent guide vanes; the angle between each guide vane and the two guide vanes adjacent to it is equal or unequal.

[0010] Among them, the angle between the distal end of one blade and the center of the circumference of the circle and the distal end of the other blade and the center of the circumference of the circle is the angle between the two adjacent blades; the distal end of the guide vane located between the two adjacent blades is located on the angle bisector of the angle between the two adjacent blades.

[0011] The guide plate can be an arc-shaped plate, a straight plate, or a folded plate.

[0012] The air duct structure provided by the present invention includes the aforementioned cross-flow fan blades.

[0013] The air conditioning indoor unit provided by the present invention includes the above-mentioned air duct structure.

[0014] The air conditioning equipment provided by the present invention includes the above-mentioned indoor air conditioning unit.

[0015] Compared with the prior art, the cross-flow fan blade, air duct structure, air conditioning indoor unit, and air conditioning equipment provided in the embodiments of the present invention have the following advantages:

[0016] The cross-flow fan blade provided by this invention features a guide vane between every two adjacent blades. This increases the working area of ​​the blades, reducing the velocity gradient of the airflow at the blade tail and thus helping to reduce vortex noise. Furthermore, the guide vane increases the contact area with the airflow, improving air delivery capacity. Simultaneously, for each pair of adjacent blades and the guide vane located between them, the distance between the distal end of the guide vane and the center of the circumference is smaller than the distance between the distal ends of the two blades and the center of the circumference. This makes the distal end of the guide vane closer to and biased towards the center of the circumference, forming a concave shape towards the center. Therefore, for the multiple blades and guide vanes as a whole, their distal ends in the circumferential direction exhibit a wavy or serrated shape. This wavy or serrated shape helps to mitigate rotational noise generated by the collision between the airflow and the volute tongue during the rotation of the cross-flow fan blade.

[0017] The air duct structure provided by the present invention includes the aforementioned flow fan blades and has all the technical features of the aforementioned cross-flow fan blades. Naturally, it has the same beneficial effects as the aforementioned cross-flow fan blades, which will not be elaborated further.

[0018] The air conditioning indoor unit provided by the present invention includes the above-mentioned air duct structure, has all the technical features of the above-mentioned air duct structure, and naturally has the same beneficial effects as the above-mentioned air duct structure, which will not be described in detail here.

[0019] The air conditioning equipment provided by the present invention includes the above-mentioned air conditioning indoor unit, has all the technical features of the above-mentioned air conditioning indoor unit, and naturally has the same beneficial effects as the above-mentioned air conditioning indoor unit, which will not be described in detail here. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cross-flow fan blade in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the middle section of the cross-flow fan blades shown;

[0024] Figure 3 for Figure 1A schematic diagram of the blades installed in the cross-flow fan blades shown;

[0025] Figure 4 for Figure 1 A schematic diagram of the blades and guide vanes installed in the cross-flow fan blades shown;

[0026] Figure 5 for Figure 1 A schematic diagram showing the setting parameters of the guide vane in the cross-flow fan blades;

[0027] Figure 6 This is a schematic diagram showing the relationship between the guide vane and the blades located on both sides of it.

[0028] Figure 7 This is a schematic diagram of a folded plate as an alternative embodiment of the present invention.

[0029] In the picture:

[0030] 1-Middle section fan blade; 2-End cover; 3-Shaft cover;

[0031] 10-Base plate; 11-Blade; 12-Guide plate;

[0032] 11a - First blade; 11b - Second blade;

[0033] 110 - distal end of the blade; 111 - proximal end of the blade;

[0034] 120 - The distal end of the deflector; 121 - The proximal end of the deflector;

[0035] O - the center of the circumference. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The embodiments of the cross-flow fan blades, air duct structure, indoor air conditioning unit, and air conditioning equipment provided by the present invention will be described below with reference to the accompanying drawings.

[0038] In one embodiment of the cross-flow fan blade of the present invention, see Figure 1 and Figure 2The cross-flow fan blade includes multiple blades 11 and multiple guide vanes 12. Generally, the cross-flow fan blade also includes multiple intermediate blades 1, as well as end caps 2 and shaft caps 3. The end caps 2 and shaft caps 3 are respectively disposed on both sides of the multiple intermediate blades 1. Each intermediate blade 1 may include a base plate 10, and the aforementioned blades 11 and guide vanes 12 are disposed on each base plate 10.

[0039] See Figure 3 and Figure 4 Multiple blades 11 are arranged sequentially at intervals along a circumference; a guide vane 12 is provided between every two adjacent blades 11. Along the radial direction of the circumference, the blades 11 have a distal end 110 and a proximal end 111, and the guide vane 12 has a distal end 120 and a proximal end 121. The distance from the distal end 120 of the guide vane 12 to the center O of the circumference is less than the distance from the distal end 110 of the blade 11 to the center O of the circumference.

[0040] In this embodiment, a guide vane 12 is provided between every two adjacent blades 11, which increases the working area of ​​the cross-flow fan blades. Increasing the working area reduces the velocity gradient of the airflow at the tail of the blades 11, thereby helping to reduce the vortex noise exhibited by the cross-flow fan blades. Furthermore, providing the guide vane 12 also increases the contact area with the airflow, thereby improving the air delivery capacity. Simultaneously, in this embodiment, for every two adjacent blades 11 and the guide vane 12 located between them, the distance between the distal end 120 of the guide vane 12 and the center O of the circumference is less than the distance between the distal ends 110 of the two blades 11 and the center O of the circumference. This makes the distal end 120 of the guide vane 12 closer to and biased towards the center O of the circumference, forming an inward concave shape towards the center O of the circumference. Thus, the distal ends 110 and 120 of the multiple blades 11 and multiple guide vanes 12 as a whole present an uneven wave shape or tooth shape in the circumferential direction. This uneven wave shape or tooth shape helps to alleviate the rotational noise generated by the collision between the airflow and the volute tongue during the rotation of the cross-flow fan blades.

[0041] Table 1 below shows the noise generated by the cross-flow fan blade in the embodiment of the present invention compared with the existing cross-flow fan blade under the same air volume conditions. It can be seen that, compared with the existing cross-flow fan blade, the noise generated by the cross-flow fan blade in the embodiment of the present invention is reduced by 1 decibel under the same operating conditions.

[0042] Table 1 compares the noise generated by the cross-flow fan blades in the embodiments of the present invention with that of existing cross-flow fan blades under the same operating conditions.

[0043] air volume m3 / h Noise dB(A) Power W Existing cross-flow fan blades 516 47.5 27.9 This invention relates to cross-flow fan blades 525 46.2 28.1

[0044] In one embodiment of the cross-flow fan blade, such as Figure 5As shown, along the direction from the distal end 110 to the proximal end 111 of the blade 11, the thickness of the blade 11 has a shape structure that first increases and then decreases. That is, there is a region between the distal end 110 and the proximal end 111 of the blade 11 where the thickness of the blade 11 is the greatest, and the airflow separates from the blade 11 from this region where the thickness is the greatest when it flows on the surface of the blade 11.

[0045] In this embodiment, the distance from the distal end 120 of the guide vane 12 to the center O of the circumference is less than the distance from the distal end 110 of the blade 11 to the center O of the circumference, but greater than the distance from the widest point of the blade 11 to the center O of the circumference. That is, as... Figure 5 As shown, the diameter of the circumference where the distal ends 110 of the multiple blades 11 are located is D1, the diameter of the circumference where the distal ends 120 of the guide vane 12 are located is D2, the diameter of the circumference where the thickness of the multiple blades 11 is the greatest is D3, and the diameter of the circumference where the proximal end 121 of the guide vane 12 is located is D4, where D3 < D2 < D1. This arrangement can improve the phenomenon of airflow separation at the position of greatest thickness on the blades 11.

[0046] In one embodiment of the cross-flow fan blade, the angle that the blade 11 has on the circumference is the wrap angle θ of the blade 11, such as... Figure 6 In the structure shown, the wrap angle θ of the blade 11 is the angle between the distal end 110 of the blade 11 and the center O of the circumference, and the proximal end 111 of the blade 11 and the center O of the circumference. The angle of the guide vane 12 on the circumference is the wrap angle η of the guide vane 12. Figure 5 In the structure shown, the wrap angle η of the blade 11 is the angle between the distal end 120 of the guide vane 12 and the center O of the circumference, and the proximal end 121 of the guide vane 12 and the center O of the circumference. In this embodiment, the wrap angle η of the guide vane 12 and the wrap angle θ of the blade 11 have the following relationship: η < θ.

[0047] In one embodiment of the cross-flow fan blade, the angle of the blade 11 on the circumference is the wrap angle θ of the blade 11. The side of the blade 11 facing the center O of the circumference is the inner side, and the side facing away from the center O of the circumference is the outer side. In this embodiment, among two adjacent blades 11, the one with its inner side facing the guide plate 12 between the two blades 11 is the first blade 11a, and the one with its outer side facing the guide plate 12 between the two blades 11 is the second blade 11b. The distal end 120 of each guide plate 12 is outside the wrap angle θ of the adjacent first blade 11a, and the proximal end 121 is inside the wrap angle θ of the adjacent first blade 11a. The angle η1 between the proximal end 121 and the center O of the circumference and the distal end 110 of the first blade 11a and the center O of the circumference is less than half of the wrap angle θ of the first blade 11a.

[0048] For example Figure 6Taking the structure shown as an example, of the two blades 11 shown in the figure, the right blade 11 is the first blade 11a, and the left blade 11 is the second blade 11b. The distal end 120 of the guide vane 12 in the figure is outside the wrap angle θ of the first blade 11a, and the proximal end 121 is inside the wrap angle θ of the first blade 11a. The angle η1 between the proximal end 121 of the guide vane 12 and the center O of the circumference and the distal end 110 of the first blade 11a and the center O of the circumference is less than θ / 2. That is, for the proximal end 121 of the guide vane 12, it is adjacent to the side of the distal end 110 of the first blade 11a and the center O of the circumference, and away from the side of the proximal end 111 of the first blade 11a and the center O of the circumference.

[0049] In this embodiment, the above-described configuration can better mitigate the airflow separation phenomenon that occurs in the region with the greatest thickness on the blade 11.

[0050] In one embodiment of the cross-flow fan blade, the angle between the distal end 120 of one of the two adjacent guide vanes 12 and the center O of the circumference of the other is the included angle β between the two adjacent guide vanes 12. The included angle β between each guide vane 12 and the two guide vanes 12 adjacent to it may be equal or unequal.

[0051] like Figure 5 As shown in the figure, the three guide vanes 12 are located between the four blades 11. Among the three guide vanes 12, the middle guide vane 12 forms an angle β1 with the guide vane 12 on the right and an angle β2 with the guide vane 12 on the left. The values ​​of the angles β1 and β2 can be equal or unequal.

[0052] In one embodiment of the cross-flow fan blade, the angle between the distal end 110 of one blade and the center O of the circumference of the other blade is the angle α between the two adjacent blades 11. Figure 2 In the figure, five adjacent blades 11 are shown to have included angles α1, α2, α3, and α4, respectively.

[0053] like Figure 5 As shown in the figure, among the three blades 11 on the right, the middle blade 11 forms an angle α1 with the right blade 11 and an angle α2 with the left blade 11. The values ​​of these angles α1 and α2 can be equal or unequal.

[0054] In this embodiment, the distal end 120 of the guide vane 12 located between two adjacent blades 11 lies on the angle bisector of the included angle α between the two adjacent blades 11. In this case, the included angle β between the two guide vanes 12 is equal to half the sum of the included angles between the two blades 11 on which the two guide vanes 12 are located.

[0055] Taking Figure 5 as an example, the included angle between the two rightmost guide vanes 12 is β1. These two guide vanes 12 are located between the three rightmost blades 11, and the included angles between the three rightmost blades 11 are α1 and α2, respectively. The included angles β1, α1, and α2 have the following relationship:

[0056] β1=(α1+α2) / 2

[0057] Therefore, when the included angle α between any blade 11 and its two adjacent blades 11 is equal, the included angle β between each guide vane 12 and its two adjacent guide vanes 12 is also equal. Conversely, when the included angle α between any blade 11 and its two adjacent blades 11 is not equal, the included angle β between each guide vane 12 and its two adjacent guide vanes 12 is also not equal.

[0058] In one embodiment of the cross-flow fan blade, the guide vane 12 is an arc-shaped plate, such as... Figure 4 and Figure 5 As shown. The air deflector 12 is set as an arc-shaped plate, which can better guide the airflow and avoid turbulence, thus helping to reduce noise.

[0059] Of course, in other embodiments of the cross-flow fan blade, the guide vane 12 can also be a straight plate or a folded plate. Figure 7 The guide plate 12 with a folded plate structure is shown.

[0060] In summary, the cross-flow fan blade provided in the above embodiments of the present invention, by providing a guide plate 12 between every two adjacent blades 11, can increase the working area of ​​the cross-flow fan blade. Increasing the working area of ​​the blades can reduce the velocity gradient of the airflow at the tail of the blades 11, thereby helping to reduce the vortex noise exhibited by the cross-flow fan blade. Furthermore, providing the guide plate 12 can also increase the contact area with the airflow, thereby improving the air delivery capacity. Simultaneously, regarding every two adjacent blades 11 and the guide plate 12 located between them, the distance between the distal end 120 of the guide plate 12 and the center O of the circumference is smaller than the distance between the distal ends 110 of the two blades 11 and the center O of the circumference, making the distal end 120 of the guide plate 12 closer to and biased towards the center O of the circumference, forming an inward concave shape towards the center O of the circumference. Thus, the distal ends 110 and 120 of the multiple blades 11 and multiple guide vanes 12 as a whole present an uneven wave shape or tooth shape in the circumferential direction. This uneven wave shape or tooth shape helps to alleviate the rotational noise generated by the collision between the airflow and the volute tongue during the rotation of the cross-flow fan blades.

[0061] In an embodiment of the air duct structure of the present invention, the air duct structure includes the aforementioned cross-flow fan blades.

[0062] In this embodiment, in addition to the cross-flow fan blades mentioned above, the duct structure may also include components such as a bottom shell, a heat exchanger, and a volute.

[0063] The air duct structure provided in this embodiment of the invention includes the cross-flow fan blades described in the above embodiments, and has all the technical features of the cross-flow fan blades. Naturally, it also has the same beneficial effects as the cross-flow fan blades, which will not be repeated here.

[0064] In an embodiment of the air conditioner indoor unit of the present invention, the air conditioner indoor unit includes the air duct structure described in the above embodiments.

[0065] The air conditioning indoor unit provided in this embodiment of the invention includes the air duct structure described in the above embodiments, has all the technical features of the above air duct structure, and naturally has the same beneficial effects as the above air duct structure, which will not be repeated here.

[0066] In an embodiment of the air conditioning equipment of the present invention, the air conditioning equipment includes an indoor unit and an outdoor unit.

[0067] The air conditioning equipment provided in this embodiment of the invention includes the air conditioning indoor unit described in the above embodiment, and has all the technical features of the air conditioning indoor unit. Naturally, it also has the same beneficial effects as the air conditioning indoor unit, which will not be repeated here.

[0068] 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.

[0069] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cross-flow fan blade, characterized in that, The cross-flow fan blade includes multiple blades and multiple guide vanes; the multiple blades are arranged sequentially at intervals in a circumferential direction; a guide vane is provided between every two adjacent blades; along the radial direction of the circumference, the blades and the guide vanes have distal ends and proximal ends; The distance from the distal end of the deflector to the center of the circumference is less than the distance from the distal end of the blade to the center of the circumference. The angle that the blade has on the circumference is the wrap angle of the blade, and the side of the blade facing the center of the circumference is the inner side, and the side facing away from the center of the circumference is the outer side. Of two adjacent blades, the one with its inner side facing the guide plate between the two blades is the first blade, and the one with its outer side facing the guide plate between the two blades is the second blade. The distal end of each deflector is outside the wrap angle of the adjacent first blade, and the proximal end is inside the wrap angle of the adjacent first blade, and the angle between the proximal end to the center of the circumference and the distal end to the center of the circumference of the first blade is less than half of the wrap angle of the first blade.

2. The cross-flow fan blade according to claim 1, characterized in that, Along the direction from the distal end to the proximal end of the blade, the thickness of the blade has a shape structure that first increases and then decreases. The distance from the far end of the deflector to the center of the circumference is less than the distance from the far end of the blade to the center of the circumference, but greater than the distance from the widest point of the blade to the center of the circumference.

3. The cross-flow fan blade according to claim 1, characterized in that, The angle that the blade has on the circumference is the wrap angle of the blade, and the angle that the guide plate has on the circumference is the wrap angle of the guide plate. The wrap angle of the guide plate is smaller than the wrap angle of the blade.

4. The cross-flow fan blade according to claim 1, characterized in that, In two adjacent deflectors, the angle between the distal end of one deflector and the center of the circumference and the distal end of the other deflector and the center of the circumference is the angle between the two adjacent deflectors. The angle between each deflector and its two adjacent deflectors may be equal or unequal.

5. The cross-flow fan blade according to claim 1 or 4, characterized in that, In two adjacent blades, the angle between the distal end of one blade and the center of the circumference and the distal end of the other blade and the center of the circumference is the angle between the two adjacent blades. The far end of the guide vane located between two adjacent blades lies on the angle bisector of the angle between the two adjacent blades.

6. The cross-flow fan blade according to claim 1, characterized in that, The guide plate can be an arc-shaped plate, a straight plate, or a folded plate.

7. A duct structure, characterized in that, The air duct structure includes the cross-flow fan blade as described in any one of claims 1 to 6.

8. An indoor unit for an air conditioner, characterized in that, The indoor unit of the air conditioner includes the air duct structure as described in claim 7.

9. An air conditioning device, characterized in that, The air conditioning equipment includes the indoor unit of the air conditioner as described in claim 8.

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