Cross-flow wind wheel and air conditioner

Abstract

The utility model discloses a cross-flow wind wheel and an air conditioner. Wherein the cross-flow wind wheel comprises two end plates and an impeller, and the two end plates are oppositely arranged; the impeller is arranged between the two end plates, the two ends of the impeller are connected with the corresponding end plates respectively, and the impeller comprises a plurality of middle-section impellers arranged in the axial direction of the cross-flow wind wheel and middle-section discs connected with the two adjacent middle-section impellers. A noise reduction structure is arranged on at least one side, in the axial direction of the cross-flow wind wheel, of the middle section disc, the noise reduction structure comprises a plurality of noise reduction parts, the multiple noise reduction parts are arranged in the circumferential direction of the middle section disc at intervals, and each noise reduction part is provided with at least one blind hole formed in the axial direction of the cross-flow wind wheel. According to the cross-flow wind wheel, the multiple noise reduction parts are arranged on at least one side of the middle section disc, the blind holes formed in the noise reduction parts form the cavity structure, and therefore the resonance noise elimination principle of the cavity structure is utilized, when the cross-flow wind wheel works, generated noise sound waves are reflected by the side walls and the bottom walls of the blind holes for multiple times in the blind holes, the sound waves are attenuated, noise is reduced, and noise reduction is achieved.

Description

Technical Field

[0001] The utility model relates to the field of indoor units of air conditioners, in particular to a cross-flow fan wheel and an air conditioner. Background Art

[0002] Air conditioners are usually equipped with crossflow impellers to blow cold or hot air into the room by using the high-speed rotation of the crossflow impeller. The crossflow impeller usually includes two end plates and an impeller connecting the two end plates. The impeller includes a plurality of middle-section impellers arranged along the length direction of the crossflow impeller, and a middle-section ring disk connecting two adjacent middle-section impellers. In the related art, the middle-section disk does not have a noise reduction function, which causes the crossflow wind to easily generate a large noise when rotating at a high speed, interfering with the user's life and work, and affecting the user experience of the air conditioner. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a crossflow impeller to reduce the noise generated when the crossflow impeller is working.

[0004] The utility model also provides an air conditioner adopting the cross-flow fan wheel.

[0005] According to the embodiment of the first aspect of the utility model, the cross-flow wind wheel includes two end plates and an impeller, and the two end plates are arranged opposite to each other; the impeller is arranged between the two end plates, and the two ends of the impeller are respectively connected to the corresponding end plates, and the impeller includes a plurality of middle-section impellers arranged along the axial direction of the cross-flow wind wheel, and a middle-section disk connecting two adjacent middle-section impellers; the middle-section disk is provided with a noise reduction structure on at least one side along the axial direction of the cross-flow wind wheel, and the noise reduction structure includes a plurality of noise reduction parts, and the plurality of noise reduction parts are arranged at intervals along the circumference of the middle-section disk, and the noise reduction part is provided with at least one blind hole arranged along the axial direction of the cross-flow wind wheel.

[0006] The throughflow wind wheel according to the embodiment of the utility model has at least the following beneficial effects: the throughflow wind wheel is provided with a plurality of noise reduction parts on at least one side of the middle section disk, and the blind holes provided in the noise reduction parts form a cavity structure, thereby utilizing the resonance sound elimination principle of the cavity structure. When the throughflow wind wheel is working, the noise sound waves generated are reflected multiple times in the blind holes through the side walls and bottom walls of the blind holes, so that the sound waves are attenuated, thereby reducing the noise and achieving noise reduction.

[0007] According to some embodiments of the utility model, the middle-section impeller includes a plurality of middle-section wind blades, and the plurality of middle-section wind blades are arranged on one side of the corresponding middle-section disk and along the circumference of the middle-section disk, and the noise reduction portion is located on the other side of the middle-section disk away from the middle-section wind blades.

[0008] According to some embodiments of the present invention, along the axial direction of the crossflow wind wheel, the middle-section wind blade has a projection on the middle-section disk, and the blind hole is located in the corresponding projection.

[0009] According to some embodiments of the utility model, the noise reduction portion is provided with a plurality of the blind holes, and the volumes of the plurality of the blind holes are the same; or, the noise reduction portion is provided with a plurality of the blind holes, and the volume of at least one of the blind holes is different from the volumes of the other blind holes.

[0010] According to some embodiments of the present invention, the noise reduction portion is provided with a first blind hole, a second blind hole, a third blind hole, a fourth blind hole and a fifth blind hole, and the first blind hole, the second blind hole, the third blind hole, the fourth blind hole and the fifth blind hole are arranged in sequence along the midline of the projection.

[0011] According to some embodiments of the present invention, the aperture of the first blind hole is d1, the aperture of the second blind hole is d2, the aperture of the third blind hole is d3, the aperture of the fourth blind hole is d4, and the aperture of the fifth blind hole is d5, wherein d1=d5, d2=d4, and d2≥d1.

[0012] According to some embodiments of the present invention, the bottom wall of the blind hole is located in the middle-section disk, or the bottom wall of the blind hole is located in the middle-section fan blade.

[0013] According to some embodiments of the present invention, the depth of the blind hole is h, and the thickness of the middle section disk is H, wherein 2mm≤H≤5mm, 0.3H≤h≤1.1H.

[0014] According to some embodiments of the utility model, the middle section disk is annular in structure, and the end surface of the middle section disk close to the axis of the through-flow wind wheel is provided with a concave-convex structure, wherein the concave-convex structure includes a plurality of concave portions and a plurality of convex portions, and the plurality of concave portions and the plurality of convex portions are alternately arranged around the axis of the middle section disk.

[0015] According to some embodiments of the present invention, the distance from the top of the convex portion to the axis of the middle section disk is R1, and the distance from the bottom of the concave portion to the axis of the middle section disk is R2, wherein 1mm≤R2-R1≤5mm.

[0016] According to some embodiments of the present invention, two openings of the recess are respectively a first side and a second side, and an angle between the first side and the second side is a, wherein 45°≤a≤90°.

[0017] According to some embodiments of the present invention, the end surface of the middle section disc is in a wave shape, a sawtooth shape, a square wave shape or a trapezoidal wave shape with concave and convex portions arranged alternately.

[0018] An air conditioner according to an embodiment of the second aspect of the utility model comprises the crossflow impeller as described in any one of the above items.

[0019] The air conditioner according to the embodiment of the utility model has at least the following beneficial effects: the blind hole arranged in the noise reduction structure of the middle section disk of the crossflow wind wheel forms a cavity structure, and the resonance sound elimination principle of the cavity structure is utilized. When the crossflow wind wheel is working, the noise sound waves generated are reflected multiple times in the blind hole through the side walls and bottom walls of the blind hole, so that the sound waves are attenuated, thereby reducing the noise and achieving noise reduction. Moreover, when the inner end surface of the middle section disk is provided with a concave-convex structure, the concave-convex structure can reduce the wake vortex of the airflow coming out of the crossflow wind wheel and reduce the noise source of the crossflow wind wheel, thereby further optimizing the user's living and working environment and improving the user experience of the air conditioner.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 It is a three-dimensional schematic diagram of a crossflow impeller according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the connection structure between the middle section disc and the middle section blades of a crossflow wind wheel according to an embodiment of the utility model;

[0024] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0025] Figure 4 It is a schematic diagram of the projection of the middle section blade of the crossflow wind wheel on the middle section disk in one embodiment of the utility model;

[0026] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0027] Figure 6 A schematic diagram of parameters of a middle section blade of a crossflow wind wheel according to an embodiment of the utility model;

[0028] Figure 7 Another parameter schematic diagram of a middle section blade of a crossflow wind wheel according to an embodiment of the utility model;

[0029] Figure 8 This is a schematic structural diagram of a crossflow impeller according to another embodiment of the utility model;

[0030] Fig. 9The figure is a comparison diagram of air volume-noise between the crossflow wind wheel of the utility model and the existing crossflow wind wheel.

[0031] Figure Number:

[0032] Crossflow impeller 100, end plate 101, impeller 102, middle section impeller 103, middle section plate 104, rotating shaft 105, welding groove 106, middle section impeller 107;

[0033] Noise reduction structure 200, noise reduction portion 201, blind hole 202, first blind hole 203, second blind hole 204, third blind hole 205, fourth blind hole 206, fifth blind hole 207;

[0034] The concavo-convex structure 300 includes a convex portion 301 , a concave portion 302 , a first side 303 , and a second side 304 . DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the descriptions involving orientation, such as left, right, etc., the orientation or positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] Reference Figure 1 The crossflow impeller 100 provided in the embodiment of the utility model comprises two end plates 101 arranged opposite to each other and an impeller 102 connecting the two end plates 101. The impeller 102 comprises a plurality of middle-section impellers 103 arranged along the axial direction of the crossflow impeller 100, and a middle-section disk 104 connecting two adjacent middle-section impellers 103.

[0040] Specifically, the end plate 101 is provided with a rotating shaft 105, and the rotating shaft 105 is used to connect with the motor, and the motor drives the rotating shaft 105 to drive the impeller 102 to rotate. The impeller 102 includes two or more middle-section impellers 103, and the multiple middle-section impellers 103 are arranged in a concentric ring shape. Two adjacent middle-section impellers 103 are separated by a middle-section disk 104. Each middle-section impeller 103 includes a plurality of middle-section blades 107 arranged in a ring shape along the circumference of the crossflow impeller 100, and a blade gap for airflow to pass is formed between any two adjacent middle-section blades 107.

[0041] When the crossflow impeller 100 is working, the impeller 102 rotates at high speed and drives the airflow to enter the inner cavity of the middle-section impeller 103 from the blade gap on one side of the middle-section impeller 103, and then rotates and squeezes in the inner cavity of the middle-section impeller 103, and finally throws out from the blade gap on the other side of the middle-section impeller 103 to achieve driving airflow. In this process, the middle-section impeller 103 will generate noise, and when the noise propagates along its axial direction, the corresponding middle-section disc 104 can play a blocking role.

[0042] In view of this, a noise reduction structure 200 is provided on the middle section disc 104 along the axial direction of the crossflow impeller 100 to achieve the effect of reducing noise through the middle section disc 104 . In this embodiment, the noise reduction structure 200 includes a plurality of noise reduction parts 201, and the plurality of noise reduction parts 201 are arranged at annular intervals along the circumference of the middle section disk 104. The noise reduction part 201 is provided with one or more blind holes 202 arranged along the axial direction of the crossflow wind wheel 100. The blind hole 202 forms a cavity structure. The side wall and the bottom wall of the cavity structure can reflect the sound waves. Therefore, the cavity structure has a resonance sound-absorbing function and can achieve the effect of sound-absorbing. Thus, one or more sound-absorbing cavities are formed in the noise reduction part 201. Each sound-absorbing cavity is equivalent to a sound-absorbing device. The plurality of noise reduction parts 201 form a plurality of sound-absorbing device groups with one or more sound-absorbing cavities surrounding the middle section disk 104. When the crossflow wind wheel 100 is working, the noise propagates along its axial direction. The generated noise sound waves are reflected multiple times in the blind hole 202 through the side wall and the bottom wall of the blind hole 202, so that the sound waves are attenuated, thereby reducing the noise and achieving noise reduction.

[0043] Reference Figure 1 The noise reduction structure 200 can be arranged on one side of the middle section disk 104. The noise reduction structure 200 arranged on one side of the middle section disk 104 can not only meet the noise reduction requirements of the cross-flow wind wheel 100, but also can well prevent the strength of the middle section disk 104 from being reduced to ensure the service life of the cross-flow wind wheel 100.

[0044] It is understandable that, under the condition that the strength of the middle section disk 104 meets the requirements, the noise reduction structure 200 can also be simultaneously provided on both sides of the same middle section disk 104 to further enhance the noise reduction effect of the crossflow impeller 100 .

[0045] Reference Figure 1, Figure 2 In some embodiments, a plurality of connection parts are provided on one side of the middle section disk 104. In this embodiment, the connection part can be set as a welding groove 106. The plurality of connection parts are arranged one by one corresponding to the plurality of middle section fan blades 107. The ends of the middle section fan blades 107 are inserted into the corresponding welding grooves 106, and the middle section fan blades 107 are fixed to the middle section disk 104 by welding. The noise reduction part 201 is opposite to the corresponding middle section fan blades 107, and is located on the other side of the middle section disk 104 away from the connection part.

[0046] Specifically, in one embodiment, the middle section blades 107 of two adjacent middle section impellers 103 are staggered, that is, along the axial direction of the crossflow impeller 100, the projection of one of the middle section blades 107 of the two adjacent middle section impellers 103 on one side of the middle section disk 104 is staggered with the projection of the other middle section blade 107 on the same side of the middle section disk 104. In this embodiment, the position of the noise reduction portion 201 is directly opposite to the position of the connecting portion on the side of the middle section disk 104 away from the noise reduction portion 201. In other words, referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 , along the axial direction of the crossflow impeller 100, the middle section blade 107 has a projection on the middle section disk 104, and the blind hole 202 provided in the noise reduction portion 201 is located in the corresponding projection. With the structure that the noise reduction portion 201 is directly opposite to the connecting portion, the blind hole 202 can extend from the end of the middle section blade 107 to the inside of the middle section blade 107, that is, the depth of the blind hole 202 can be greater than the thickness of the middle section disk 104, and the bottom wall of the blind hole 202 is located on the middle section blade 107. Therefore, the depth of the blind hole 202 can be set larger to increase the volume of the cavity and improve the sound-absorbing effect, and a variety of blind hole 202 structures with different volumes can be set so that the noise reduction structure 200 can reduce noise in a wider frequency band; and, in the design of the middle-section fan blade 107, the middle-section fan blade 107 has a larger chamfered corner, and the draft feature when the middle-section fan blade 107 mold is made, which can be conducive to setting a countersunk hole at the end of the middle-section fan blade 107, and will not affect the use strength of the middle-section fan blade 107. The blind hole 202 extends from the end of the middle-section fan blade 107 to the middle-section fan blade 107, and can also reduce the weight of the middle-section fan blade 107 and reduce the amount of materials used to make the middle-section fan blade 107, thereby reducing the weight of the cross-flow fan wheel 100, saving the production cost of the cross-flow fan wheel 100, and at the same time, reducing the energy consumption of the cross-flow fan wheel 100 during use, reducing the use cost of the cross-flow fan wheel 100.

[0047] It is understandable that, in one embodiment, the position of the noise reduction portion 201 can also be staggered with the position of the connection portion, that is, the position of the noise reduction portion 201 is located between the connection portions of two adjacent middle-section fan blades 107 on one side of the middle-section disk 104 away from the noise reduction portion 201, and the bottom wall of the blind hole 202 is located on the middle-section disk 104. The structure in which the noise reduction portion 201 and the connection portion are staggered can ensure the noise reduction effect while ensuring the structural strength of the crossflow fan 100.

[0048] When multiple blind holes 202 are provided in the noise reduction part 201, the multiple blind holes 202 can be arranged in regular or irregular shapes, such as multiple blind holes 202 can be arranged in regular shapes such as arcs, triangles, rectangles, etc., or can be randomly arranged in a limited area, which is not limited here.

[0049] It is understandable that the aperture of the blind hole 202 can be specifically set according to the frequency band distribution of the noise, and the noise reduction processing of the noise in a wider frequency band can be adapted by changing the aperture and depth of the blind hole 202.

[0050] For example, in some embodiments, a plurality of blind holes 202 are provided in the noise reduction portion 201, the apertures of the plurality of blind holes 202 are the same, the apertures of the plurality of blind holes 202 in different noise reduction portions 201 are the same, the depths of the plurality of blind holes 202 are also the same, and the plurality of blind holes 202 have the same volume. The noise reduction structure 200 using this structure has a better noise reduction effect on noise of a specific frequency or a narrow frequency band.

[0051] In some embodiments, a plurality of blind holes 202 are provided in the noise reduction portion 201, the apertures of the plurality of blind holes 202 are the same, the apertures of the plurality of blind holes 202 in different noise reduction portions 201 are the same, the depths of the plurality of blind holes 202 are different, and the plurality of blind holes 202 have different volumes. The noise reduction structure 200 using this structure has a better noise reduction effect on noise in a wider frequency band.

[0052] In order to adapt to the noise reduction processing of a wider frequency band, the blind hole 202 of the noise reduction structure 200 can also be arranged in different ways.

[0053] Specifically, the apertures of the multiple blind holes 202 of the same noise reduction part 201 of the noise reduction structure 200 are the same, the apertures of the blind holes 202 of different noise reduction parts 201 are different, and the depths of the blind holes 202 of different noise reduction parts 201 are the same. Therefore, the volumes of the blind holes 202 of different noise reduction parts 201 are different. A blind hole 202 of a certain volume has a better noise reduction effect on noise of a certain frequency. A plurality of blind holes 202 of different volumes are combined to adapt to the noise reduction processing of a wider frequency band.

[0054] The apertures of the multiple blind holes 202 of the same noise reduction part 201 of the noise reduction structure 200 are the same, the apertures of the blind holes 202 of different noise reduction parts 201 are different, and the depths of the blind holes 202 of different noise reduction parts 201 are also different. Therefore, the volumes of the blind holes 202 of different noise reduction parts 201 are different. A blind hole 202 of a certain volume has a better noise reduction effect on noise of a certain frequency. A plurality of blind holes 202 of different volumes are combined to adapt to the noise reduction processing of a wider frequency band.

[0055] The apertures of the multiple blind holes 202 of the same noise reduction part 201 of the noise reduction structure 200 are different, the apertures of the blind holes 202 of different noise reduction parts 201 are different, and the depths of the blind holes 202 of different noise reduction parts 201 are also different. Therefore, the volumes of the blind holes 202 of different noise reduction parts 201 are different. A blind hole 202 of a certain volume has a better noise reduction effect on noise of a certain frequency. A plurality of blind holes 202 of different volumes are combined to adapt to the noise reduction processing of a wider frequency band.

[0056] Reference Figure 3 In one embodiment, the noise reduction portion 201 is provided with a first blind hole 203, a second blind hole 204, a third blind hole 205, a fourth blind hole 206 and a fifth blind hole 207, and the first blind hole 203, the second blind hole 204, the third blind hole 205, the fourth blind hole 206 and the fifth blind hole 207 are arranged in sequence along the midline of the axial projection of the middle-section fan blade 107 on the middle-section disk 104, and the first blind hole 203, the second blind hole 204, the third blind hole 205, the fourth blind hole 206 and the fifth blind hole 207 are arranged in sequence along a direction away from the axis of the middle-section disk 104, the aperture of the first blind hole 203 is d1, the aperture of the second blind hole 204 is d2, and the aperture of the first blind hole 203 is d4. The aperture of the third blind hole 205 is d3, the aperture of the fourth blind hole 206 is d4, and the aperture of the fifth blind hole 207 is d5. In addition, the aperture sizes of the five blind holes 202 can be arranged according to the thickness distribution of the middle-section fan blade 107. In addition, since the five blind holes 202 are arranged in sequence along the midline of the axial projection of the middle-section fan blade 107 on the middle-section disk 104, the positions of the blind holes 202 are exactly opposite to the positions of the corresponding ends of the middle-section fan blade 107. The blind holes 202 can extend from the ends of the middle-section fan blade 107 to the inside of the middle-section fan blade 107, that is, the depth of the blind holes 202 can be greater than the thickness of the middle-section disk 104, and the bottom wall of the blind holes 202 is located on the middle-section fan blade 107. Figure 3In the illustrated embodiment, the middle section fan blade 107 adopts a symmetrical blade shape. The thickness of this type of middle section fan blade 107 is the largest in the middle and the thickness on both sides gradually decreases. Therefore, in this embodiment, the third blind hole 205 is arranged in the middle part of the axial projection of the middle section fan blade 107 on the middle section disk 104, the first blind hole 203 and the second blind hole 204 and the fourth blind hole 206 and the fifth blind hole 207 are respectively located on both sides of the third blind hole 205, and the aperture of the third blind hole 205 is the largest. The apertures of the first blind hole 203 and the second blind hole 204 and the fourth blind hole 206 and the fifth blind hole 207 respectively located on both sides of the third blind hole 205 are smaller than the aperture of the third blind hole 205, and the aperture of the blind hole 202 gradually decreases along the direction from the third blind hole 205 to the fifth blind hole 207 and along the direction from the third blind hole 205 to the first blind hole 203, and in this embodiment, d1=d5, d2=d4, and d2≥d1.

[0057] It should be noted that the shape of the blind hole 202 can be a circular blind hole 202, a square blind hole 202 or a blind hole 202 of other shapes. When the shape of the blind hole 202 is a square blind hole 202 or a blind hole 202 of other shapes, the aperture of the blind hole 202 refers to the maximum distance inside the square blind hole 202 or the blind hole 202 of other shapes. In addition, the aperture of the blind hole 202 should be understood as the diameter.

[0058] In some embodiments, when the crossflow wind wheel 100 adopts a middle-section wind blade 107 of other blade types, the first blind hole 203, the second blind hole 204, the third blind hole 205, the fourth blind hole 206 and the fifth blind hole 207 are arranged in sequence along the center line of the axial projection of the middle-section wind blade 107 on the middle-section disk 104, and the apertures of the five blind holes 202 can be set to be the same, that is, d1=d2=d3=d4=d5.

[0059] Reference Figure 6 , the depth of the blind hole 202 is h, and the thickness of the middle section disk 104 is H, wherein the thickness of the middle section disk 104 is set between 2 mm and 5 mm, that is, 2 mm ≤ H ≤ 5 mm, and the depth of the blind hole 202 is set to and 0.3*H ≤ h ≤ 1.1*H. Therefore, when the aperture of the blind hole 202 is not suitable to be set too large due to the blade shape of the middle section wind blade 107, the depth of the blind hole 202 can be increased as much as possible to ensure that the blind hole 202 has a certain volume, and ensure that the blind hole 202 has a certain noise reduction effect, thereby ensuring the noise reduction effect of the crossflow wind wheel 100.

[0060] In one embodiment, the depth h of the blind hole 202 is set to h=0.5*H. When the thickness H of the node disk 104 is set to 4 mm, the depth h of the blind hole 202 is set to 2 mm. This can ensure that the crossflow wind wheel 100 has a good noise reduction effect and the structural strength of the crossflow wind wheel 100 can be guaranteed.

[0061] When the crossflow wind wheel 100 is in operation, the airflow transported by the crossflow wind wheel 100 will generate a certain number of wake vortices. When the wake vortices are broken, a certain amount of noise will be generated. Therefore, the wake vortices are equivalent to noise sources. When there are too many wake vortices, the noise of the electrical equipment using the crossflow wind wheel 100 will increase, thereby reducing the comfort of using the electrical equipment.

[0062] In view of this, refer to Figure 2 , Figure 3 , Figure 4 Based on any of the above embodiments, the middle section disk 104 is annular in structure, and the end surface of the middle section disk 104 close to the axis of the crossflow wind wheel 100 is provided with a concave-convex structure 300, and the concave-convex structure 300 includes a plurality of concave parts 302 and a plurality of convex parts 301, and the plurality of concave parts 302 and the plurality of convex parts 301 surrounding the axis of the middle section disk 104 are alternately arranged. The plurality of concave parts 302 and the plurality of convex parts 301 of the concave-convex structure 300 can disturb the airflow passing through the crossflow wind wheel, reduce the wake vortex of the impeller 102, and correspondingly reduce the noise source of the crossflow wind wheel 100 during operation, and reduce the noise generated when the wake vortex breaks.

[0063] In this embodiment, the cross-flow wind wheel 100 organically combines the noise reduction structure 200 arranged on the side of the middle section disk 104 and the concave-convex structure 300 arranged on the inner end surface of the middle section disk 104. The two noise reduction structures 200 work together to effectively reduce the noise of the air conditioner using the cross-flow wind wheel 100 by 1-2 decibels. At the same time, the weight of the cross-flow wind wheel 100 can be reduced by about 5% on the basis of the existing cross-flow wind wheel 100, which can reduce the manufacturing cost of the cross-flow wind wheel 100 and the use cost of the cross-flow wind wheel 100.

[0064] Reference Figure 3 , Figure 7 In some embodiments, the multiple concave portions 302 and the multiple convex portions 301 of the concave-convex structure 300 are alternately arranged in a zigzag shape. Through the structural characteristics of the zigzag concave-convex structure 300, the flow condition of the airflow delivered from the crossflow wind wheel 100 can be effectively improved, the wake vortex of the airflow coming out of the crossflow wind wheel 100 can be effectively reduced, and the noise caused by the rupture of the wake vortex can be reduced, thereby reducing the noise of the air conditioner using the crossflow wind wheel 100 and improving the comfort of the air conditioner.

[0065] It is understandable that, referring to Figure 8The multiple concave portions 302 and the multiple convex portions 301 of the concave-convex structure 300 may also be in the form of alternatingly arranged structures such as wave shapes, square waves or trapezoidal waves. In other words, as long as the uneven structures are alternately arranged on the end surface of the middle section disk 104 close to the axis of the crossflow wind wheel 100, the purpose of effectively reducing the wake vortex of the airflow coming out of the crossflow wind wheel 100 and reducing the noise caused by the rupture of the wake vortex is achieved, it is within the scope of the present application.

[0066] Reference Figure 3 , Figure 7 In the specific embodiment shown in the figure, the concave and convex structures 300 have multiple concave parts 302 and multiple convex parts 301 arranged alternately in a sawtooth shape. Experiments have shown that the size of the concave parts 302 and convex parts 301 of the sawtooth concave and convex structure 300 can affect the flow of the airflow from the crossflow impeller 100, thereby affecting the wake vortex of the airflow from the crossflow impeller 100, and affecting the noise caused by the rupture of the wake vortex. The shape and size parameters of the concave parts 302 and convex parts 301 of the concave and convex structure 300 include: the angle B between the first side 303 and the second side 304 of the concave part 302, the distance R1 from the top end of the convex part 301 to the axis of the middle section disk 104, the distance R2 from the bottom end of the concave part 302 to the axis of the middle section disk 104, and the distance difference between R2 and R1, etc. These structural parameter settings can affect the noise reduction effect of the air conditioner using the crossflow impeller 100.

[0067] Specifically, refer to Figure 7 In some embodiments, the opening of the recess 302 has two sides respectively including a first side 303 and a second side 304, and the angle between the first side 303 and the second side 304 is a, wherein 45°≤a≤90°, and the distance from the top of the protrusion 301 to the axis of the middle section disk 104 is R1, and the distance from the bottom of the recess 302 to the axis of the middle section disk 104 is R2, wherein 1mm≤R2-R1≤5mm.

[0068] Experiments have shown that the cross-flow wind wheel 100 formed by assembling a middle section disk 104 having a concave-convex structure 300 composed of a sawtooth-shaped concave portion 302 and a convex portion 301 within the above-mentioned parameter range can effectively improve the flow condition of the airflow coming out of the cross-flow wind wheel 100, effectively reduce the wake vortex of the airflow coming out of the re-injection wind wheel, and reduce the noise caused by the rupture of the wake vortex. Combined with the noise reduction structure 200 arranged on the middle section disk 104, it can reduce the noise of the air conditioner using the cross-flow wind wheel 100 and improve the comfort of the air conditioner.

[0069] In order to verify the noise reduction effect of the crossflow wind wheel 100 of the present invention, a comparison test was conducted between the crossflow wind wheel 100 of the embodiment of the present invention and the crossflow wind wheel 100 of the related art. In the comparative test, the middle section disk 104 of the crossflow wind wheel 100 of the embodiment of the utility model has a noise reduction structure 200 and a concave-convex structure 300, and the other parameters are as follows: each noise reduction part 201 is provided with five blind holes 202, and the position of the blind hole 202 is opposite to the end of the middle section fan blade 107, the thickness H of the middle section disk 104 is 4 mm, the depth h of the blind hole 202 is 2 mm, the angle a between the first side 303 and the second side 304 of the concave portion 302 of the concave-convex structure 300 is 60°, the distance R1 from the top end of the convex portion 301 to the axis of the middle section disk 104, and the distance R2 from the bottom end of the concave portion 302 to the axis of the middle section disk 104, wherein R2-R1 is 3 mm, the crossflow wind wheel 100 of the embodiment of the utility model and the crossflow wind wheel 100 of the related art are tested under the same test conditions, and the following is drawn based on the test data: Fig. 9 The air volume-noise comparison diagram shown in Figure 1 is Fig. 9 It can be seen that under the same test conditions, compared with the crossflow impeller 100 of the related art, the noise of the crossflow impeller 100 of the embodiment of the utility model can be reduced by 1-2 decibels on average.

[0070] It can be understood that, based on any of the above embodiments, in addition to setting the blind hole 202 on the middle disk 104 of the crossflow wind wheel 100, multiple blind holes 202 can also be set on the end plate 101 of the crossflow wind wheel 100, so as to utilize the blind holes 202 on the end plate 101 to silence the noise at both ends of the crossflow wind wheel 100, thereby improving the noise reduction efficiency.

[0071] The air conditioner provided in the second embodiment of the utility model comprises the crossflow impeller 100 as described in any one of the above items.

[0072] The air conditioner of the embodiment of the utility model forms a cavity structure by the blind hole 202 arranged on the middle disk 104 of the cross-flow wind wheel 100, and utilizes the resonance sound elimination principle of the cavity structure. When the cross-flow wind wheel 100 is working, the noise sound waves generated are reflected multiple times by the side walls and bottom walls of the blind hole 202 in the blind hole 202, so that the sound waves are attenuated, thereby reducing the noise and achieving noise reduction. In addition, when the concave-convex structure 300 is arranged on the inner end surface of the middle disk 104, the concave-convex structure 300 can reduce the wake vortex of the airflow coming out of the cross-flow wind wheel 100 and reduce the noise source of the cross-flow wind wheel 100, thereby further optimizing the user's living and working environment and enhancing the user experience of the air conditioner.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A crossflow impeller, characterized in that: include: Two end plates, the two end plates are arranged opposite to each other; An impeller is disposed between the two end plates, with both ends of the impeller being connected to the corresponding end plates respectively, and the impeller comprises a plurality of middle-section impellers arranged along the axial direction of the crossflow impeller, and a middle-section disk connecting two adjacent middle-section impellers; A noise reduction structure is arranged on at least one side of the middle section disk along the axial direction of the crossflow wind wheel. The noise reduction structure includes a plurality of noise reduction parts. The plurality of noise reduction parts are arranged at intervals along the circumference of the middle section disk. The noise reduction part is provided with at least one blind hole arranged along the axial direction of the crossflow wind wheel.

2. The crossflow impeller according to claim 1, characterized in that: The middle section impeller includes a plurality of middle section blades, which are arranged on one side of the corresponding middle section disk and along the circumference of the middle section disk. The noise reduction portion is located on the other side of the middle section disk away from the middle section blades.

3. The crossflow impeller according to claim 2, characterized in that: Along the axial direction of the crossflow wind wheel, the middle-section wind blade has a projection on the middle-section disk, and the blind hole is located in the corresponding projection.

4. The crossflow impeller according to claim 3, characterized in that: The noise reduction portion is provided with a plurality of the blind holes, and the volumes of the plurality of the blind holes are the same; or, the noise reduction portion is provided with a plurality of the blind holes, and the volume of at least one of the blind holes is different from the volumes of the other blind holes.

5. The crossflow impeller according to claim 3, characterized in that: The noise reduction portion is provided with a first blind hole, a second blind hole, a third blind hole, a fourth blind hole and a fifth blind hole, and the first blind hole, the second blind hole, the third blind hole, the fourth blind hole and the fifth blind hole are arranged in sequence along the midline of the projection.

6. The crossflow impeller according to claim 5, characterized in that: The aperture of the first blind hole is d1, the aperture of the second blind hole is d2, the aperture of the third blind hole is d3, the aperture of the fourth blind hole is d4, and the aperture of the fifth blind hole is d5, wherein d1=d5, d2=d4, and d2≥d1.

7. The crossflow impeller according to claim 3, characterized in that: The bottom wall of the blind hole is located in the middle section disk, or the bottom wall of the blind hole is located in the middle section fan blade.

8. The crossflow impeller according to claim 7, characterized in that: The depth of the blind hole is h, and the thickness of the middle section disk is H, wherein 2mm≤H≤5mm, and 0.3*H≤h≤1.1*H.

9. The crossflow impeller according to any one of claims 1 to 8, characterized in that: The middle section disk is annular in structure, and the end surface of the middle section disk close to the axis of the crossflow wind wheel is provided with a concave-convex structure, wherein the concave-convex structure includes a plurality of concave parts and a plurality of convex parts, and the plurality of concave parts and the plurality of convex parts are alternately arranged around the axis of the middle section disk.

10. The crossflow impeller according to claim 9, characterized in that: The distance from the top end of the convex portion to the axis of the middle section disk is R1, and the distance from the bottom end of the concave portion to the axis of the middle section disk is R2, wherein 1mm≤R2-R1≤5mm.

11. The crossflow impeller according to claim 9, characterized in that: Two sides of the opening of the recess are respectively a first side and a second side, and an angle between the first side and the second side is a, wherein 45°≤a≤90°.

12. The crossflow impeller according to claim 9, characterized in that: The end surface of the middle section disc is in a wave shape, a sawtooth shape, a square wave shape or a trapezoidal wave shape with concave and convex shapes arranged alternately.

13. An air conditioner, characterized in that: It comprises a crossflow impeller as claimed in any one of claims 1 to 12.

Images