Cross-flow fan and air conditioner

Abstract

The invention provides a cross-flow fan and an air conditioner. The cross-flow fan comprises a driving shaft and at least one cross-flow fan blade, and the cross-flow fan blade is rotationally connected to the driving shaft; the cross-flow fan blade comprises a plurality of cross-flow blades distributed around the first axis of the driving shaft. The cross-flow blades have first deformation in the radial direction and / or the circumferential direction of the cross-flow fan blades; wherein the first deformation amount changes in the extending direction of the first axis. The technical problem solved by the invention is that the cross-flow blade does not play a good role in improving the noise generated by beating the volute tongue due to the fact that the cross-flow blade in the related technology is relatively simple in structure, specifically, the cross-flow blade is of a long-strip-shaped structure, and the arc-shaped surface of the long-strip-shaped structure is parallel to the axis of the driving shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a cross-flow fan and an air conditioner. Background Art

[0002] Common air conditioner indoor units are equipped with cross-flow fans, and the wind force can be adjusted by changing the rotation speed of the cross-flow fan.

[0003] When the crossflow fan rotates around the driving shaft, unstable circulating vortices are easily formed in the two end areas of the crossflow fan blades near the volute tongue, and the circulating vortices in the two end areas can be transmitted to the middle area when they change, making the circulating vortices in the overall axial area of ​​the crossflow fan blades unstable, resulting in high instability of the air supply volume and serious noise pollution.

[0004] However, since the structure of the cross-flow blade in the related art is relatively simple, specifically in the form of a long sheet structure, the curved surface of the long sheet structure is arranged parallel to the axis of the drive shaft, resulting in the cross-flow blade not playing a good role in improving the noise generated by the beating volute tongue. Summary of the invention

[0005] The technical problem solved by the present invention is that since the structure of the cross-flow blade in the related technology is relatively simple, specifically a long sheet structure, the arc surface of the long sheet structure is arranged parallel to the axis of the drive shaft, resulting in the cross-flow blade not playing a good role in improving the noise generated by the beating volute tongue.

[0006] In order to solve the above problems, the present invention provides a crossflow fan, comprising: a drive shaft and at least one crossflow blade, which is rotatably connected to the drive shaft; the crossflow blade comprises a plurality of crossflow blades distributed around a first axis of the drive shaft; the crossflow blade has a first deformation amount along the radial and / or circumferential direction of the crossflow blade; wherein the first deformation amount changes along the extension direction of the first axis.

[0007] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: Specifically, in combination with the operation of the crossflow fan in the indoor unit of the air conditioner, the crossflow blade is made to have a first deformation amount in the radial direction and / or the circumferential direction, so as to change the spatial physical position of the crossflow blade along the radial air inlet and outlet. Due to this spatial displacement difference, the rotation noise generated by the crossflow blade periodically beating the volute tongue can be effectively improved.

[0008] In an embodiment of the present invention, the first deformation amount changes monotonically along the extension direction of the first axis; or, the first deformation amount changes symmetrically in the direction from the middle portion of the crossflow blade to the two ends thereof.

[0009] Compared with the prior art, the technical effect achieved by adopting this technical solution is: when the first deformation amount changes monotonically along the first axis, it can be specifically manifested as if the first deformation amount is formed in the radial direction, then the distance between the two ends of the cross-flow blade and the first axis is the minimum and maximum compared with other parts. In contrast, when the first deformation amount changes symmetrically from the middle part of the cross-flow blade to its two ends, the distance between the corresponding middle part of the cross-flow blade and the first axis is the maximum or minimum compared with other parts. Furthermore, if the first deformation amount is formed in the circumferential direction, the analysis is the same as the above situation, and it will not be repeated here. Therefore, whether the first deformation amount is set in the radial direction or the circumferential direction, the first deformation amount can be changed monotonically or symmetrically transformed at both ends based on the center, and the flow dislocation of the cross-flow fan in space is realized, thereby improving the sound quality of the cross-flow blade and reducing the rotational noise.

[0010] In an embodiment of the present invention, the first deformation amount is a gradual deformation.

[0011] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the effect of improving the rotational noise generated by the periodic beating of the volute tongue by the crossflow blades is further improved, and the first deformation amount is avoided to change abruptly or change too much in amplitude in the direction along the first axis, resulting in the inability to introduce sufficient air intake and achieve sufficient air outlet during the rotation of the crossflow fan, resulting in a reduction in the actual heat exchange efficiency between the indoor unit of the air conditioner and the indoor environment.

[0012] In an embodiment of the present invention, when the first deformation amount changes symmetrically in a direction from the middle portion of the crossflow blade to both ends thereof, the maximum value of the first deformation amount is formed at the middle portion of the crossflow blade.

[0013] Compared with the prior art, the technical effects achieved by adopting this technical solution are: on the one hand, the rotational noise generated by the periodic beating of the volute tongue by the crossflow blades is improved; on the other hand, the air intake and air outlet are ensured during the rotation of the crossflow fan, and the minimum value of the first deformation is avoided to be formed in the middle part of the crossflow blades, causing the crossflow blades in the crossflow fan to present a "V" shape relative to the first axis, thereby affecting the air intake and air outlet.

[0014] In an example of the present invention, when the crossflow blade has a first deformation amount along the circumferential direction of the crossflow blade, the deformation directions of the multiple first deformation amounts are the same; wherein the deformation directions are arranged in a counterclockwise or clockwise direction around the first axis.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: It can be understood that if the deformation directions of multiple first deformation amounts are different, the spacing between multiple crossflow blades will also change, for example, the distances between two adjacent crossflow blades will be different. Combined with the fact that the deformation directions of the first deformation amounts in the radial and circumferential directions are also different, the stability of the crossflow fan during rotation cannot be guaranteed, and the degree of shaking is likely to increase, and even more noise may be generated, thereby reducing the user experience. In addition, the difficulty of assembly will be increased, and the production efficiency of the product will be reduced.

[0016] In one embodiment of the present invention, the first deformation formed in the radial direction of the crossflow blade is defined as the radial deformation, and the first deformation formed in the circumferential direction of the crossflow blade is defined as the circumferential deformation; the maximum value of the radial deformation and the maximum value of the circumferential deformation are both located in the middle part of the crossflow blade.

[0017] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the arrangement difficulty of multiple crossflow blades in the crossflow fan blade is reduced and more reasonable, and the flow dislocation of the crossflow fan in space is effectively realized, thereby improving the sound quality of the crossflow fan blade and reducing the rotational noise.

[0018] In an example of the present invention, the first deformation amount is denoted as K, where K≤1.5 mm.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is: avoiding the deformation degree of the first deformation amount being too large, which would cause the stability of the cross-flow fan to decrease during the rotation process.

[0020] In an embodiment of the present invention, a plurality of crossflow blades provided on the same crossflow blade are arranged at non-equidistant intervals along the circumferential direction.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: each crossflow blade extends along its axial direction and is arranged in a cylindrical shape at intervals along its circumference. The non-uniform arrangement of the crossflow blades can effectively disrupt the airflow state at different positions of the crossflow blades, reduce the resonance of the crossflow blades in the blade tube, and thus further reduce the noise pollution generated during the operation of the crossflow fan and the air conditioner.

[0022] In one embodiment of the present invention, there are multiple crossflow blades, and two adjacent crossflow blades among the multiple crossflow blades are defined as a first crossflow blade and a second crossflow blade; the circumferential arrangement position of the crossflow blades of the first crossflow blade is different from the circumferential arrangement position of the crossflow blades of the second crossflow blade.

[0023] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the blades of the adjacent first crossflow blades and the second crossflow blades are not in a one-to-one correspondence along the circumferential direction. Specifically, the arrangement of the blades in the first crossflow blades and the second crossflow blades can be the same, and the two are deflected and staggered at a certain angle along the circumferential direction, so that the pressure change has a phase, which correspondingly reduces the noise pollution caused by the pressure change when the crossflow blades rotate, and further reduces the noise pollution generated when the crossflow fan and the air conditioner are in operation.

[0024] On the other hand, the present invention also provides an air conditioner, comprising: a shell, in which an installation space is provided; a volute tongue structure, which is installed in the installation space; a cross-flow fan such as any of the above examples, which is installed in the installation space, and the parts of the cross-flow fan corresponding to the volute tongue structure have a first deformation amount.

[0025] Compared with the prior art, the technical effect achieved by adopting this technical solution is: it can achieve the corresponding technical effect in any of the above-mentioned technical solutions, which will not be repeated here.

[0026] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0027] (1) In combination with the operation of the crossflow fan in the indoor unit of the air conditioner, the crossflow blades are made to have a first deformation amount in the radial direction and / or the circumferential direction, so as to change the spatial physical position of the crossflow blades along the radial air inlet and outlet. Due to this spatial displacement difference, the rotation noise generated by the crossflow blades periodically beating against the volute tongue can be effectively improved;

[0028] (2) The blades of the adjacent first crossflow blade and the second crossflow blade are not in a one-to-one correspondence along the circumferential direction. Specifically, the blades of the first crossflow blade and the second crossflow blade can be arranged in the same manner, and the two are offset by a certain angle along the circumferential direction, so that the pressure change has a phase, which correspondingly reduces the noise pollution caused by the pressure change when the crossflow blade rotates, thereby further reducing the noise pollution generated by the operation of the crossflow fan and the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a cross-flow fan provided in an embodiment of the present invention.

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0031] Figure 3 for Figure 1 Schematic diagram of the structure of the crossflow fan blade from another perspective.

[0032] Figure 4 for Figure 1 Schematic diagram of the structure of the crossflow fan blade from another perspective.

[0033] Description of reference numerals:

[0034] 100. Crossflow fan; 101. Radial direction; 102. Circumferential direction; 103. Axial direction; 10. Drive shaft; 11. First axis line; 20. Crossflow blade; 21. Crossflow blade; 211. First side edge; 212. Second side edge; 216. Outer side edge; 217. Inner side edge; 22. First crossflow blade; 23. Second crossflow blade. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 , which is a schematic diagram of the structure of a cross-flow fan 100 provided in an embodiment of the present invention. Figure 2-Figure 4 The crossflow fan 100 includes, for example, a drive shaft 10 and at least one crossflow blade 20. The crossflow blade 20 is rotatably connected to the drive shaft 10; the crossflow blade 20 includes a plurality of crossflow blades 21 distributed around a first axis 11 of the drive shaft 10; the crossflow blade 21 has a first deformation amount along a radial direction 101 and / or a circumferential direction 102 of the crossflow blade 20; wherein the first deformation amount changes along the extension direction of the first axis 11.

[0037] The extension direction of the first axis 11 and the axial direction 103 are parallel to each other.

[0038] In a specific example, in the verification experiment of the design and mold opening of the crossflow fan blade 20, it was found that for the same three-dimensional crossflow fan blade 20 model, the 3D printed prototype fan blade and the final molded fan blade had different sound quality. In the wall resonance laboratory, the sound quality of the 3D printed prototype fan blade is better than that of the molded one. After the rotational statics simulation analysis, it was found that the crossflow fan blade 20 will undergo radial 101 deformation during the rotation process. Since the mold opening adopts AS+30% glass fiber design, the overall deformation is small, and the strength of the photosensitive resin material used for 3D printing is relatively weak, which will produce a certain amount of deformation. Therefore, when the crossflow fan blade 20 made of 3D printed photosensitive resin material and the crossflow fan blade 20 obtained by the mold opening are respectively applied to the indoor unit of the air conditioner under the same conditions, it is found that the noise generated by the former during the operation of the air conditioner indoor unit is less than the noise of the latter.

[0039] Of course, it should be emphasized that in the present technical solution, the only consideration is whether the crossflow fan blade 20 itself has a deformation amount in the radial direction 101. The final conclusion is that the crossflow fan blade 20 with a deformation amount in the radial direction 101 has a significant improvement on the noise generated by the flapping of the volute tongue compared to the crossflow fan blade 20 with no deformation amount in the radial direction 101. That is, the crossflow fan blade 20 with a deformation amount in the radial direction 101 can achieve a good noise reduction effect.

[0040] Specifically, the reason for the above conclusion is that the deformation of the crossflow blade 20 in the radial direction 101 will change the spatial physical position of the crossflow blade 20 along the radial direction 101 for air intake and air outlet. Due to this spatial displacement difference, the rotation noise generated by the crossflow blade 21 periodically beating the volute tongue can be effectively improved.

[0041] For ease of understanding, the side surface of the crossflow blade 21 close to the first axis 11 can be defined as the inner side surface 217, and the side surface away from the first axis 11 is the outer side surface 216, so that the crossflow blade 20 is deformed in the radial direction 101, specifically, the inner side surface 217 and the outer side surface 216 of the crossflow blade 21 arranged thereon are both convex in the direction away from the first axis 11 to form a spherical curved surface.

[0042] Of course, similarly, the deformation of the crossflow blade 20 in the circumferential direction 102 will also change the spatial physical position of the crossflow blade 20 along the radial direction 101 for air intake and air discharge. Due to this spatial displacement difference, the rotation noise of the crossflow blade 21 periodically beating the volute tongue can be effectively improved.

[0043] Combination Figure 3 , further speaking, taking a single crossflow blade 21 as an example, the side of the crossflow blade 21 close to the first axis 11 is defined as the second side 212, and the side away from the first axis 11 is defined as the first side 211. Since the first deformation amount formed in the circumferential direction 102 changes in the extension direction along the first axis 11, the first side 211 and the second side 212 are no longer straight lines, but are specifically curved lines. In addition, the deformation direction of the first side 211 and the deformation direction of the second side 212 are the same, for example, both are convex in the clockwise direction.

[0044] Therefore, in summary, when the first deformation corresponds to the deformation of the crossflow blade 20 in the radial direction 101, for example, the spherical surface formed by the inner side surface 217 and the outer side surface 216 mentioned above bulge in the direction away from the first axis 11 in the radial direction 101, combined with the first deformation corresponding to the deformation of the crossflow blade 20 in the circumferential direction 102, for example, the first side edge 211 and the second side edge 212 mentioned above bulge in the clockwise direction. Therefore, when the crossflow blade 20 has the first deformation in both the radial direction 101 and the circumferential direction 102, the crossflow fan 100 can effectively improve the rotation noise generated by the periodic beating of the crossflow blade 21 against the volute tongue during rotation.

[0045] Preferably, the first deformation amount changes monotonically along the extension direction of the first axis 11; or, the first deformation amount changes symmetrically in the direction from the middle portion of the crossflow blade 20 to the two ends thereof.

[0046] For example, when the first deformation amount changes monotonically along the first axis 11, it can be specifically expressed as if the first deformation amount is formed in the radial direction 101, then the distance between the two ends of the cross-flow blade 21 and the first axis 11 is the minimum and maximum compared with other parts. In contrast, when the first deformation amount changes symmetrically from the middle part of the cross-flow blade 20 to its two ends, the distance between the corresponding middle part of the cross-flow blade 21 and the first axis 11 is the maximum or minimum compared with other parts. Furthermore, if the first deformation amount is formed in the circumferential direction 102, the analysis is the same as the above situation, and it will not be repeated here. Therefore, whether the first deformation amount is set in the radial direction 101 or the circumferential direction 102, the first deformation amount can be monotonically changed or symmetrically transformed at both ends based on the center, and the cross-flow fan 100 can achieve flow dislocation in space, thereby improving the sound quality of the cross-flow blade 20 and reducing the rotational noise.

[0047] Preferably, the first deformation is a gradual deformation. This further improves the effect of improving the rotation noise generated by the periodic beating of the volute tongue by the crossflow blade 21, and avoids the first deformation in the direction along the first axis 11 changing abruptly or changing too much, which causes the crossflow fan 100 to rotate, making it impossible to introduce sufficient air intake and achieve sufficient air outlet, resulting in a reduction in the actual heat exchange efficiency between the indoor unit of the air conditioner and the indoor environment.

[0048] Preferably, when the first deformation changes symmetrically from the middle of the crossflow blade 20 to the two ends thereof, the maximum value of the first deformation is formed at the middle of the crossflow blade 21. On the one hand, the rotation noise generated by the crossflow blade 21 periodically beating the volute tongue is improved; on the other hand, the air intake and air output during the rotation of the crossflow fan 100 are ensured, and the minimum value of the first deformation is avoided from being formed at the middle of the crossflow blade 21, causing the crossflow blade 21 to present a "V" shape relative to the first axis 11 in the crossflow fan 100, thereby affecting the air intake and air output.

[0049] Preferably, when the crossflow blades 21 have a first deformation amount along the circumferential direction 102 of the crossflow blades 20, the deformation directions of the multiple first deformation amounts are the same; wherein the deformation direction is arranged in a counterclockwise or clockwise direction around the first axis 11. It is understandable that if the deformation directions of the multiple first deformation amounts are different, the spacing between the multiple crossflow blades 20 will also change, for example, the distances between two adjacent crossflow blades 21 will be different, and when the deformation directions of the first deformation amounts in the radial direction 101 and the circumferential direction 102 are also different, the stability of the crossflow fan 100 during rotation cannot be guaranteed, and the degree of shaking is likely to increase, and even more noise is generated, thereby reducing the user experience; in addition, it will increase the difficulty of assembly and reduce the production efficiency of the product.

[0050] Preferably, the first deformation amount formed in the radial direction 101 of the crossflow blade 20 is defined as the radial direction 101 deformation amount, and the first deformation amount formed in the circumferential direction 102 of the crossflow blade 20 is defined as the circumferential direction 102 deformation amount; the maximum value of the radial direction 101 deformation amount and the maximum value of the circumferential direction 102 deformation amount are both located in the middle part of the crossflow blade 20. Specifically, the radial direction 101 deformation amount can be recorded as D1, and the circumferential direction 102 deformation amount can be recorded as D2.

[0051] Preferably, the first deformation amount is denoted as K, where K≤1.5 mm.

[0052] Preferably, the multiple crossflow blades 21 provided on the same crossflow blade 20 are arranged at non-equidistant intervals along the circumferential direction 102 .

[0053] In a specific example, each cross-flow blade 21 extends along its axial direction 103 and is arranged in a cylindrical shape at intervals along its circumferential direction 102. The non-uniform arrangement of the cross-flow blades 21 can effectively disrupt the airflow state at different positions of the cross-flow blades 20, reduce the resonance of the cross-flow blades 21 in the blade tube, and further reduce the noise pollution generated during the operation of the cross-flow fan 100 and the air conditioner.

[0054] Preferably, there are multiple crossflow blades 20, and two adjacent crossflow blades 20 among the multiple crossflow blades 20 are defined as a first crossflow blade 22 and a second crossflow blade 23; the arrangement position of the crossflow blades 21 of the first crossflow blade 22 along the circumferential direction 102 is different from the arrangement position of the crossflow blades 21 of the second crossflow blade 23 along the circumferential direction 102.

[0055] In a specific example, the blades of the adjacent first crossflow blades 22 and the second crossflow blades 23 are not in a one-to-one correspondence along the circumferential direction 102. Specifically, the blades in the first crossflow blades 22 and the second crossflow blades 23 can be arranged in the same manner, and the two are deflected and staggered by a certain angle along the circumferential direction 102, so that the pressure change has a phase, which correspondingly reduces the noise pollution caused by the pressure change when the crossflow blades 20 rotate, thereby further reducing the noise pollution generated when the crossflow fan 100 and the air conditioner are in operation.

[0056] Of course, in contrast, in a crossflow fan 100, the specific configuration of the first crossflow blade 22 and the second crossflow blade 23 with respect to the first deformation amount can be different combinations, and the specific configuration can refer to the above content, so as to further disrupt the spatial displacement difference, and further effectively improve the rotation noise generated by the crossflow blade 21 periodically beating the volute tongue.

[0057] On the other hand, an embodiment of the present invention further provides an air conditioner. The air conditioner, for example, includes a housing, a volute tongue structure, and a crossflow fan 100 as in any of the above technical solutions. Specifically, an installation space is provided in the housing; the volute tongue structure is installed in the installation space; the crossflow fan 100 is installed in the installation space, and the crossflow fan 100 has a first deformation amount at a portion corresponding to the volute tongue structure. In this embodiment, the technical effects of any of the above technical solutions for the crossflow fan 100 can be achieved, which will not be repeated here.

[0058] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A crossflow fan, characterized in that: include: A drive shaft (10) and at least one crossflow blade (20), wherein the crossflow blade (20) is rotatably connected to the drive shaft (10); The crossflow blade (20) comprises a plurality of crossflow blades (21) distributed around a first axis (11) of the drive shaft (10); The crossflow blade (21) has a first deformation amount along the radial direction (101) and / or the circumferential direction (102) of the crossflow blade (20); Wherein, the first deformation amount changes along the extension direction of the first axis (11).

2. The crossflow fan according to claim 1, characterized in that: The first deformation amount changes monotonically along the extension direction of the first axis (11); Alternatively, the first deformation amount changes symmetrically in a direction from the middle portion of the crossflow fan blade (20) to the two ends thereof.

3. The crossflow fan according to claim 2, characterized in that: The first deformation amount is a gradual deformation.

4. The crossflow fan according to any one of claims 1 to 3, characterized in that: When the first deformation amount changes symmetrically in a direction from the middle portion of the cross-flow blade (20) toward both ends thereof, the maximum value of the first deformation amount is formed at the middle portion of the cross-flow blade (21).

5. The crossflow fan according to any one of claims 1 to 3, characterized in that: When the crossflow blade (21) has the first deformation amount along the circumferential direction (102) of the crossflow blade (20), the deformation directions of a plurality of the first deformation amounts are the same; Wherein, the deformation direction is arranged in a counterclockwise or clockwise direction around the first axis (11).

6. The crossflow fan according to claim 1, characterized in that: A first deformation amount formed in a radial direction (101) of the crossflow blade (20) is defined as a radial deformation amount (101), and a first deformation amount formed in a circumferential direction (102) of the crossflow blade (20) is defined as a circumferential deformation amount (102); The maximum value of the radial (101) deformation and the maximum value of the circumferential (102) deformation are both located in the middle of the crossflow blade (20).

7. The crossflow fan according to any one of claims 1 to 3, characterized in that: The first deformation is denoted as K, where K≤1.5 mm.

8. The crossflow fan according to claim 1, characterized in that: A plurality of crossflow blades (21) provided on the same crossflow fan blade (20) are arranged at non-equidistant intervals along the circumferential direction (102).

9. The crossflow fan according to claim 1, characterized in that: The number of the crossflow blades (20) is plural, and two adjacently arranged crossflow blades (20) among the plurality of crossflow blades (20) are defined as a first crossflow blade (22) (20) and a second crossflow blade (23) (20); The arrangement position of the cross-flow blades (21) of the first cross-flow blades (22) (20) along the circumferential direction (102) is different from the arrangement position of the cross-flow blades (21) of the second cross-flow blades (23) (20) along the circumferential direction (102).

10. An air conditioner, characterized in that: include: A housing, wherein an installation space is provided in the housing; A volute tongue structure, the volute tongue structure is installed in the installation space ； The cross-flow fan according to any one of claims 1 to 9, wherein the cross-flow fan is installed in the installation space, and a portion of the cross-flow fan corresponding to the volute tongue structure has the first deformation amount.

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