CN219733728U - Fan blade and air conditioner - Google Patents

Abstract

The utility model discloses a fan blade and an air conditioner, wherein the fan blade comprises: the rotating shaft part is provided with a shaft hole, the shaft hole extends along a first direction, a first cavity is formed in the rotating shaft part, the rotating shaft part is provided with a side wall part positioned at one side of the first direction, the side wall part is provided with a first silencing hole, and the first silencing hole is communicated with the first cavity; and a blade portion provided on the side wall portion. According to the fan blade, the first cavity is formed in the rotating shaft part, and the first silencing hole communicated with the first cavity is formed in the side wall part of the rotating shaft part, so that wind noise generated during operation of the fan blade and motor noise formed by a motor behind the fan blade can be silenced and reduced, the silencing performance is improved, and the silencing quantity is increased.

Description

Fan blade and air conditioner

Technical Field

The utility model relates to the technical field of fans, in particular to a fan blade and an air conditioner.

Background

In the related art, noise generated by a fan blade in an air conditioner outdoor unit in a rotating process is one of main sound sources of the outdoor unit noise. The existing noise reduction technology is mainly used for optimizing the blade shape of the fan blade, and the main principle is that the fan blade is optimized to cause disturbance of nearby air flow in the rotating process, so that wind noise is reduced. Similar to the scheme of directly changing the blade profile, the number of the fan blades, the gentle blade torsion angle and the like, the noise is reduced from the sound source, but when the source of the fan blades is used for reducing the noise, the noise is difficult to reduce again when the noise is reduced to a certain degree, and the noise reduction effect is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a fan blade, which can reduce noise on a noise transmission path at a rotating shaft, and improve noise elimination performance and noise elimination effect.

The utility model also aims at providing an air conditioner so as to apply the fan blade.

According to an embodiment of the utility model, a fan blade comprises: the rotary shaft part is provided with a shaft hole, the shaft hole extends along a first direction, a first cavity is formed in the rotary shaft part, the rotary shaft part is provided with a side wall part positioned at one side of the first direction, the side wall part is provided with a first silencing hole, and the first silencing hole is communicated with the first cavity; and a blade portion provided on the side wall portion.

According to the fan blade provided by the embodiment of the utility model, the first cavity is arranged in the rotating shaft part, the first silencing hole communicated with the first cavity is arranged on the side wall part of the rotating shaft part, so that noise generated by wind noise when the fan blade operates and motor noise formed by a motor behind the wind blade can be silenced and reduced, the silencing performance is improved, and the silencing quantity is increased.

In some embodiments of the present utility model, the first cavity is an annular cavity disposed around a circumferential direction of the shaft hole, and the first sound-deadening holes are plural and uniformly disposed on the side wall portion.

In some embodiments of the utility model, the first cavity has a first wall surface adjacent to the side wall portion, and a second wall surface opposite to the first wall surface, a distance between the second wall surface and the first wall surface being t1, wherein 5 mm.ltoreq.t1.ltoreq.20mm.

In some embodiments of the present utility model, a second cavity is provided inside the rotating shaft portion, the rotating shaft portion has a front wall portion located at one end in the first direction, a second sound attenuation hole is provided on the front wall portion, the second sound attenuation hole communicates with the second cavity, and the first cavity is provided between the second cavity and the side wall portion.

In some embodiments of the present utility model, the front wall portion has a recess recessed toward the inside of the second cavity, a groove is formed in the recess, a groove width of the groove gradually decreases in the first direction and toward the inside of the second cavity, and the second sound-deadening hole is provided in the groove.

In some embodiments of the utility model, the second sound attenuation holes are multiple and uniformly arranged on the groove.

In some embodiments of the present utility model, the side wall portion includes a plurality of first regions, at least two of the first regions have different wall thicknesses, the first sound-damping holes are provided in each of the first regions, and/or the front wall portion includes a plurality of second regions, at least two of the second regions have different wall thicknesses, and the second sound-damping holes are provided in each of the second regions.

In some embodiments of the utility model, the first and second sound attenuation holes have a diameter of 1mm or less.

In some embodiments of the utility model, the shaft portion includes: the outer cylinder wall of the first cylinder body is the side wall part; the second cylinder body is arranged in the first cylinder body and is connected with one end of the first cylinder body; the first cover plate covers the other ends of the second cylinder body and the first cylinder body, and the first cover plate and the first cylinder body jointly define the first cavity, and the first cover plate is the front wall part; the second cover plate covers one end of the second cylinder body, the second cover plate, the second cylinder body and the first cover plate jointly define the second cavity, wherein the shaft hole is formed in the second cover plate, or the shaft hole is formed in the second cover plate and the first cover plate.

The air conditioner comprises a motor and a fan blade, wherein a motor shaft of the motor is arranged in the shaft hole, and the fan blade is any one of the fan blades.

According to the air conditioner provided by the embodiment of the utility model, by adopting the fan blade, the noise in front of the air conditioner during operation can be reduced, the noise elimination performance is improved, the noise elimination effect is enhanced, and better use experience is brought.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic perspective view of a fan blade according to an embodiment of the present utility model;

FIG. 2 is a partial cross-sectional view of a blade in an embodiment of the utility model;

FIG. 3 is an enlarged view of a portion at III of FIG. 2;

FIG. 4 is a schematic diagram showing a perspective view of a blade according to an embodiment of the present utility model;

FIG. 5 is a schematic perspective view of a first cover plate according to an embodiment of the utility model;

FIG. 6 is a partial cross-sectional view of a first cover plate in an embodiment of the utility model;

FIG. 7 is a schematic view of the structure of an air conditioner according to an embodiment of the present utility model;

fig. 8 is a graph comparing the effects of the wind blade according to the embodiment of the present utility model after acoustic simulation with the conventional wind blade.

Reference numerals:

100. a fan blade;

10. a rotating shaft portion;

101. a shaft hole; 1011. a fool-proof part; 102. a first cavity; 1021. a first wall surface; 1022. a second wall surface; 103. a side wall portion; 1031. a first sound attenuation hole; 1032. a sidewall surface; 104. a second cavity; 1041. a third wall surface; 1042. a fourth wall surface; 105. a front wall portion; 1051. a second sound deadening hole; 1052. a concave portion; 1052a, grooves; 1053. reinforcing ribs; 1054. a front wall surface;

111. a first cylinder; 112. a second cylinder; 113. a first cover plate; 114. a second cover plate;

20. a blade section;

1000. an air conditioner external unit; 200. and a motor.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following describes a fan blade 100 according to an embodiment of the present utility model with reference to fig. 1 to 8.

As shown in fig. 1 to 3, a fan blade 100 according to an embodiment of the present utility model includes a rotation shaft portion 10 and a blade portion 20. The shaft portion 10 is provided with a shaft hole 101, the shaft hole 101 extends along a first direction, a first cavity 102 is formed in the shaft portion 10, the shaft portion 10 is provided with a side wall portion 103 located at one side of the first direction, the side wall portion 103 is provided with a first noise elimination hole 1031, and the first noise elimination hole 1031 is communicated with the first cavity 102. The blade portion 20 is provided on the side wall portion 103.

In the fan blade 100 of the present utility model, the rotating shaft portion 10 is used to drive the fan blade 100 to rotate integrally, wherein the first direction may refer to an axial direction of the shaft hole 101, the shaft hole 101 is used to be assembled with a motor shaft of the motor 200 along the first direction, and the rotating shaft portion 10 rotates around the first direction to drive the blade portion 20 to form an airflow in front of the fan blade 100.

During operation, the fan blade 100 generates wind noise when the blade portion 20 rotates, and the motor 200 generates noise when it operates and transmits the noise to the front of the shaft portion 10 along the first direction. Because the inside of the rotating shaft portion 10 is provided with the first cavity 102, the side wall portion 103 is provided with the first noise elimination hole 1031, wind noise formed on the blade portion 20 can enter the first cavity 102 through the first noise elimination hole 1031, meanwhile, noise of the motor 200 can enter the first cavity 102 through the first noise elimination hole 1031 when passing through the side wall portion 103, and the noise elimination structure formed by the first noise elimination hole 1031 and the first cavity 102 can weaken wind noise and motor noise, so that the front noise of the fan blade 100 is greatly reduced.

According to the fan blade 100 of the embodiment of the present utility model, by arranging the first cavity 102 in the rotating shaft portion 10, and arranging the first noise elimination hole 1031 communicating with the first cavity 102 on the side wall portion 103 of the rotating shaft portion 10, noise and noise generated during operation of the fan blade 100 and motor noise generated by the motor 200 behind the fan blade 100 can be eliminated, which is beneficial to improving noise elimination performance and increasing noise elimination amount.

In some embodiments of the present utility model, the first cavity 102 is an annular cavity disposed around the circumferential direction of the shaft hole 101, and the first sound-deadening holes 1031 are plural and uniformly disposed on the side wall portion 103.

The side wall 103 may be a wall around the circumference of the shaft 10, and by providing the first cavity 102 as an annular cavity, the annular cavity has a larger outer dimension and a larger surrounding surface on the premise that the volume of the first cavity 102 is fixed. For example, the annular cavity is closer to the wall surface of the side wall portion 103, has a larger radius, and has a smaller cavity thickness. In addition, the plurality of first noise elimination holes 1031 are uniformly provided on the side wall portion 103, so that wind noise and motor noise can enter the first cavity 102 from the plurality of first noise elimination holes 1031, noise can be quickly eliminated in a short time, and noise reduction rate can be improved.

In some embodiments, the plurality of vane portions 20 is arranged in a lattice of the first muffler holes 1031 on the sidewall portion 103 between any two adjacent vane portions 20. For example, as shown in fig. 1, the number of blade portions 20 may be three.

In some embodiments, as shown in fig. 1, the plurality of blade parts 20 is provided, the first noise elimination holes 1031 on the side wall part 103 between any two adjacent blade parts 20 are provided in a plurality of groups, the plurality of groups of first noise elimination holes 1031 are arranged at intervals around the first direction, and the first noise elimination holes 1031 of each group are provided in at least two groups and are arranged at intervals along the first direction.

For example, referring to fig. 1, the first sound damping holes 1031 on the side wall portion 103 between any adjacent two of the blade portions 20 are two groups, and the first sound damping holes 1031 of each group are eight. Of course, the number of the groups of the first muffler holes 1031 and the number of each group may be other values, which are not described in detail herein.

In some embodiments of the present utility model, as shown in FIG. 3, the first cavity 102 has a first wall 1021 near the side wall 103, and a second wall 1022 opposite to the first wall 1021, the distance between the second wall 1022 and the first wall 1021 being t1, wherein 5 mm.ltoreq.t1.ltoreq.20mm.

The distance t1 between the second wall 1022 and the first wall 1021 may be the cavity depth of the first cavity 102, and setting t1 within a range of 5mm to 20mm may provide a sound damping structure formed by the first cavity 102 and the first sound damping hole 1031 with a relatively good sound damping performance. For example, the distance t1 between the second wall 1022 and the first wall 1021 may be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. Of course, the method is only illustrated here, and t1 can also take other values within the range of 5mm to 20mm, which are not described in detail here.

In some embodiments of the present utility model, as shown in fig. 3, the side wall portion 103 has a side wall surface 1032 where the first sound deadening hole 1031 is located, and a distance between the side wall surface 1032 and the first wall surface 1021 is t3, wherein 0.5 mm.ltoreq.t3.ltoreq.1 mm. It will be understood that t3 may refer to the wall thickness of the side wall 103, and affect the noise elimination frequency of the noise elimination structure, so as to improve the noise elimination effect, and noise in a common noise frequency band can be eliminated by setting t3 in a range of 0.5mm to 1mm. For example, t3 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and the like. Of course, the foregoing is merely illustrative, and t3 may take other values within the range of 0.5mm to 1mm, which will not be described in detail herein.

In some embodiments of the present utility model, the ratio of the sum of the areas of the plurality of first sound-deadening holes 1031 to the area of the side wall surface 1032 is m1, wherein 0.5% to 3%.

The ratio m1 of the sum of the areas of the plurality of first noise elimination holes 1031 to the area of the side wall surface 1032 may be the penetration rate of the side wall 103, and the noise elimination performance may be good when the value of m1 is within a proper range. If m1 is less than 0.5%, the number of the first noise elimination holes 1031 on the side wall surface 1032 is relatively small, and the noise elimination performance is poor; if m1 exceeds 3%, the strength of the side wall 103 is poor, the lifetime is relatively low, and the noise cancellation frequency is also affected. Noise elimination of noise in a common noise frequency band can be achieved by setting m1 in the range of 0.5% -3%.

For example, m1 may take the value of 0.5%, 0.7%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, etc. Of course, the foregoing is merely illustrative, and m1 may take other values within a range of 0.5% -3%, which are not described herein in detail.

In some embodiments of the present utility model, as shown in fig. 1 to 4, the second cavity 104 is provided inside the rotating shaft portion 10, the rotating shaft portion 10 has a front wall portion 105 located at one end in the first direction, the front wall portion 105 is provided with a second sound attenuation hole 1051, the second sound attenuation hole 1051 communicates with the second cavity 104, and the first cavity 102 is provided between the second cavity 104 and the side wall portion 103.

The first cavity 102 and the first noise elimination hole 1031 on the side wall 103 can attenuate most of wind noise and motor noise, at this time, the noise in front of the fan blade 100 is attenuated, on the basis, the second cavity 104 and the second noise elimination hole 1051 on the front wall 105 can form a second noise elimination structure, and further noise reduction is performed on the noise existing in front of the fan blade 100, so that the noise is attenuated again, and the noise reduction effect is further improved.

As shown in fig. 8, the abscissa of the graph shows sound frequency in hz, the ordinate shows sound transmission loss in db, wherein curve 1 is a fan blade 100 employing the present utility model, and curve 2 is a conventional fan blade. With reference to fig. 8, the greater the transmission loss, the better the noise reduction effect, and according to the transmission loss curve, the fan blade 100 of the present utility model can achieve the reduction of wind noise in the frequency band of the required noise reduction through the design of two noise reduction structures, and has a plurality of wider noise reduction frequency bands, while the existing fan blade has no noise reduction effect basically.

In some embodiments of the present utility model, the second cavity 104 and the second sound damping hole 1051 may form the same sound damping frequency band as the sound damping structure formed by the first cavity 102 and the first sound damping hole 1031. That is, two noise elimination structures can carry out noise elimination and noise reduction to the same noise frequency channel, promote the noise reduction effect.

In some embodiments of the present utility model, the second cavity 104 and the second sound attenuating hole 1051 may form a sound attenuating structure that differs from the sound attenuating frequency band of the sound attenuating structure formed by the first cavity 102 and the first sound attenuating hole 1031. That is, two noise elimination structures can make an uproar to two noise frequency channels, increase the frequency channel of making an uproar falls, bring better noise reduction effect. For example, according to the peak frequency corresponding to the peripheral noise of the fan blade 100, two silencing structures may be respectively designed, so as to achieve silencing of two frequency bands and improve the noise reduction effect.

In some embodiments of the present utility model, as shown in fig. 1, the second sound attenuation holes 1051 are plural and uniformly provided on the front wall portion 105. The plurality of second noise elimination holes 1051 are uniformly arranged on the front wall 105, so that noise in front of the fan blade 100 can enter the second cavity 104 from the plurality of second noise elimination holes 1051, the noise can be quickly eliminated in a short time, and the noise reduction rate is improved.

In some embodiments of the present utility model, as shown in fig. 2 and 6, the front wall portion 105 has a concave portion 1052 recessed toward the inside of the second cavity 104, a groove 1052a is formed on the concave portion 1052, the groove width of the groove 1052a gradually decreases in the first direction and toward the inside of the second cavity 104, and the second sound deadening hole 1051 is provided on the groove 1052 a.

It will be appreciated that the recess 1052 is provided on the front wall 105, and the recess 1052a is formed with a groove 1052a, so that the sound damping surface of the front wall 105 can be increased compared to the planar structure of the front wall 105, that is, the contact surface between the front wall 105 and the noise wave is relatively large, and more noise can be absorbed through the second sound damping hole 1051, thereby increasing the sound damping amount.

Alternatively, the shape of the recess 1052a includes, but is not limited to, conical and pyramidal.

In some embodiments of the present utility model, as shown in fig. 6, the second sound deadening holes 1051 are provided in plurality and uniformly on the groove 1052 a. The plurality of second sound attenuation holes 1051 are arranged on the groove 1052a, so that the noise entering the groove 1052a can be quickly absorbed and reduced, the noise reduction rate is improved, and the noise reduction effect is improved.

Optionally, the plurality of second sound attenuation holes 1051 are arranged in a lattice on the groove 1052 a.

Alternatively, as shown in fig. 6, a plurality of second sound-deadening holes 1051 are formed in the groove 1052a in plural sets, the plural sets of second sound-deadening holes 1051 being disposed at intervals around the first direction, the second sound-deadening holes 1051 of each set being disposed at intervals along the first direction. For example, the second sound-deadening holes 1051 are twelve groups, and the second sound-deadening holes 1051 of each group are six. Of course, the number of the second sound-deadening holes 1051 and the number of each group may be other values, which are not described herein.

In some embodiments of the present utility model, as shown in FIG. 3, the second cavity 104 has a third wall 1041 adjacent to the front wall 105, and a fourth wall 1042 opposite to the third wall 1041, and a distance t2 between the fourth wall 1042 and the third wall 1041 is 5 mm.ltoreq.t2.ltoreq.50mm.

The distance t2 between the fourth wall 1042 and the third wall 1041 may be the cavity depth of the second cavity 104, and setting t2 within a range of 5mm to 50mm may provide a sound damping structure formed by the second cavity 104 and the second sound damping hole 1051 with a relatively good sound damping performance. For example, the distance t2 between the fourth wall 1042 and the third wall 1041 can be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 34mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, and so forth. Of course, the foregoing is merely illustrative, and t2 may take other values within a range of 5mm to 50mm, which will not be described in detail herein.

In some embodiments of the present utility model, as shown in FIG. 3, the front wall 105 has a front wall 1054 where the second sound attenuation hole 1051 is located, and the distance between the front wall 1054 and the third wall 1041 is t4, where 0.5 mm.ltoreq.t4.ltoreq.1mm.

It will be appreciated that t4 may refer to the wall thickness of the front wall 105 and affect the muffling frequency of the muffling structure, improving the muffling effect, and muffling noise at common noise frequencies can be performed by setting t4 in the range of 0.5mm to 1mm. For example, t4 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and the like. Of course, the foregoing is merely illustrative, and t4 may take other values within the range of 0.5mm to 1mm, which will not be described in detail herein.

In some embodiments of the present utility model, the ratio of the sum of the areas of the plurality of second sound-deadening holes 1051 to the area of the front wall 1054 is m2, wherein 0.5% or less m2 or less 3%.

The ratio m2 of the sum of the areas of the plurality of second sound-deadening holes 1051 to the area of the front wall 1054 may refer to the penetration rate of the front wall 105, and the sound-deadening performance is good when the value of m2 is within a suitable range. If m2 is less than 0.5%, the number of the second sound deadening holes 1051 of the front wall portion 105 is small, and the sound deadening performance is poor; if m2 is greater than 3%, the strength of the front wall 105 is poor, the life is short, and the noise cancellation frequency is affected. Noise elimination at common noise frequencies can be achieved by setting m2 in the range of 0.5% -3%.

For example, m2 may be 0.5%, 0.7%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, etc. Of course, the foregoing is merely illustrative, and m2 may take other values within a range of 0.5% -3%, which are not described herein in detail.

In some embodiments of the present utility model, the sidewall 103 includes a plurality of first regions, at least two of which have different wall thicknesses, and each of the first regions has a first sound attenuation hole 1031 formed therein. And/or the front wall 105 includes a plurality of second regions, at least two of which have unequal wall thicknesses, and each of which is provided with a second sound-deadening hole 1051.

For the silencing structure formed by the first cavity 102 and the first silencing holes 1031, under the condition that the size and the penetrating rate of the first silencing holes 1031 are unchanged, noise in different frequency bands can be silenced, silencing frequency bands are increased, multi-frequency band silencing is achieved, and silencing effects are further improved by arranging first areas with different thicknesses on the side wall parts 103 and arranging the first silencing holes 1031 in each first area.

Similarly, in the sound-deadening structure formed by the second cavity 104 and the second sound-deadening hole 1051, when the size and the penetration rate of the second sound-deadening hole 1051 are unchanged, by arranging the front wall 105 in the second areas with different thicknesses and arranging the second sound-deadening hole 1051 in each second area, the sound-deadening structure can deaden noises in different frequency bands, increase sound-deadening frequency bands, realize multi-band sound-deadening, and further improve sound-deadening effects.

In the side wall 103 and the front wall 105 of the spindle 10, the side wall 103 may include a plurality of first regions, the front wall 105 may include a plurality of second regions, or the side wall 103 may include a plurality of first regions, and the front wall 105 may include a plurality of second regions.

It can be seen from the foregoing that the first cavity 102, the first noise elimination hole 1031, the second cavity 104 and the second noise elimination hole 1051 are disposed on the rotating shaft portion 10, so that noise in different noise frequency bands can be reduced, on this basis, the noise elimination structure formed by the first cavity 102 and the first noise elimination hole 1031 can also reduce noise in multiple noise frequency bands, and the noise elimination structure formed by the second cavity 104 and the second noise elimination hole 1051 can also reduce noise in multiple frequency bands, so that the noise frequency bands capable of reducing noise can be greatly increased, and the noise elimination effect is optimized. For example, according to the peak frequency corresponding to the peripheral noise of the fan blade 100, the wall thicknesses of the two silencing structures can be respectively designed, so that more than two frequency bands can be silenced, and the noise reduction effect can be improved.

In some embodiments of the utility model, the diameters of the first sound attenuating holes 1031 and the second sound attenuating holes 1051 are 1mm or less. The diameters of the first noise elimination hole 1031 and the second noise elimination hole 1051 are smaller than or equal to 1mm, so that the first noise elimination hole 1031 and the second noise elimination hole 1051 form micropores, noise at common noise frequency is eliminated, and a good noise elimination effect is achieved. For example, the diameters of the first and second sound-deadening holes 1031 and 1051 are 1mm, 0.8mm, 0.6mm, 0.5mm, 0.4mm, 0.2mm, 0.1mm, and the like.

It should be noted that, the first sound damping hole 1031 and the second sound damping hole 1051 are not limited to be circular holes, and in other embodiments, the first sound damping hole 1031 and the second sound damping hole 1051 may also be square holes, triangular holes, and the like, and may be specifically set as needed, which is not described herein.

In some embodiments of the present utility model, as shown in fig. 3, the rotation shaft portion 10 includes a first cylinder 111, a second cylinder 112, a first cover plate 113, and a second cover plate 114. The outer cylinder wall of the first cylinder 111 is a side wall 103. The second cylinder 112 is disposed in the first cylinder 111 and is connected to one end of the first cylinder 111. The first cover 113 covers the second cylinder 112 and the other end of the first cylinder 111, and defines the first cavity 102 together with the first cylinder 111 and the second cylinder 112, and the first cover 113 is the front wall 105. A second cover 114 covers one end of the second cylinder 112, and the second cover 114, the second cylinder 112 and the first cover 113 together define the second cavity 104.

It can be appreciated that the rotating shaft portion 10 adopts a double-cylinder structure, the gap between the first cylinder 111 and the second cylinder 112 and the first cover plate 113 jointly form the first cavity 102, the second cover plate 114 covers the second cylinder 112 and forms the second cavity 104 together with the second cylinder 112 and the first cover plate 113, and the structure is simple, easy to manufacture and beneficial to cost reduction.

The second cover plate 114 is provided with a shaft hole 101, or the second cover plate 114 and the first cover plate 113 are provided with shaft holes 101. That is, the shaft hole 101 may be directly provided on the second cover plate 114. Alternatively, as shown in fig. 3, the second cover 114 and the first cover 113 are provided with shaft holes 101, and the motor shaft of the motor 200 can be inserted into the two shaft holes 101.

In some embodiments of the present utility model, the shape of the first cylinder 111 and the second cylinder 112 includes, but is not limited to, a circular cylinder, a polygonal cylinder. When the first cylinder 111 and the second cylinder 112 are polygonal cylinder, they may be a quadrangular cylinder, a hexagonal cylinder, or the like.

In some embodiments of the present utility model, the recess 1052 and the groove 1052a are provided on the first cover plate 113, and a reinforcing rib 1053 is provided on a side of the recess 1052 adjacent to the second cavity 104, and the reinforcing rib 1053 is connected to the second cylinder 112. The strength between the first cover plate 113 and the second cylinder 112 can be improved by arranging the reinforcing ribs 1053, and the service life is prolonged.

Specifically, as shown in fig. 3, a distance t4 between the front wall 1054 and the third wall 1041 may refer to a thickness of the first cover plate 113.

Specifically, as shown in fig. 3, a distance t3 between the side wall surface 1032 and the first wall surface 1021 may refer to a thickness of the first cylinder 111.

In some embodiments of the present utility model, as shown in fig. 5, the first cover plate 113 is provided with shaft holes 101, the shaft holes 101 are provided with foolproof parts 1011, and the foolproof parts 1011 can be matched with the motor shaft to limit the motor shaft to rotate relative to the shaft holes 101, and then the motor shaft is fixed in the shaft holes 101 through gaskets and nuts.

Alternatively, the fool-proof portion 1011 may be a contact plane, that is, a stepped surface is provided on the motor shaft, and after the motor shaft is inserted into the shaft hole 101, the stepped surface can contact with the contact plane, thereby restricting the rotation of the motor shaft relative to the shaft hole 101.

In the fan blade 100 of the present utility model, the noise cancellation structure formed by the first cavity 102 and the first noise cancellation hole 1031 can be adjusted in frequency by changing the size of the first noise cancellation hole 1031, the wall thickness and the penetration rate of the side wall 103, and the cavity depth of the first cavity 102, thereby adjusting the noise cancellation frequency of the noise cancellation structure formed by the first cavity 102 and the first noise cancellation hole 1031. Specifically, the calculation can be performed by the following formula:

wherein f _r Is the resonant frequency (i.e., the center frequency of muffling); c is the sound velocity of noise; p is the penetration rate; d is the cavity depth of the first cavity 102; d is the diameter of the first sound attenuation hole 1031; t is the wall thickness of the side wall 103.

Similarly, in the sound damping structure formed by the second cavity 104 and the second sound damping hole 1051, the frequency of sound damping of the sound damping structure formed by the second cavity 104 and the second sound damping hole 1051 can be adjusted by changing the size of the second sound damping hole 1051, the wall thickness and the perforation rate of the front wall 105, and the cavity depth of the second cavity 104. Accordingly, in the above formula, D is the cavity depth of the second cavity 104; d is the diameter of the second sound attenuation hole 1051; t is the wall thickness of the front wall portion 105.

The air conditioner according to the embodiment of the utility model comprises a motor 200 and a fan blade 100, wherein a motor shaft of the motor 200 is arranged in a shaft hole 101, and the fan blade 100 is any one of the fan blades 100.

As shown in fig. 7, the air conditioner may be an air conditioner outdoor unit 1000, and the fan blade 100 can reduce wind noise and motor noise when the air conditioner outdoor unit 1000 is running, so that noise in front of the air conditioner outdoor unit 1000 is reduced. Other components and operations of the air conditioner external 1000 are known to those skilled in the art, and will not be described in detail herein.

According to the air conditioner provided by the embodiment of the utility model, by adopting the fan blade 100, the front noise of the air conditioner during operation can be reduced, the noise elimination performance is improved, the noise elimination effect is enhanced, and better use experience is brought.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A fan blade, characterized by comprising:

the rotary shaft part is provided with a shaft hole extending along a first direction, the rotary shaft part is provided with a first cavity, the rotary shaft part is provided with a side wall part positioned at one side of the first direction, the side wall part is provided with a first silencing hole, and the first silencing hole is communicated with the first cavity;

and a blade portion provided on the side wall portion.

2. The fan blade according to claim 1, wherein the first cavity is an annular cavity provided around a circumferential direction of the shaft hole, and the first sound-deadening holes are provided in plurality and uniformly on the side wall portion.

3. The fan blade of claim 1, wherein the first cavity has a first wall surface adjacent to the side wall portion, and a second wall surface opposite to the first wall surface, and a distance between the second wall surface and the first wall surface is t1, wherein 5mm is less than or equal to t1 is less than or equal to 20mm.

4. The fan blade according to claim 1, wherein the rotating shaft portion is provided with a second cavity, the rotating shaft portion is provided with a front wall portion located at one end in the first direction, the front wall portion is provided with a second silencing hole, the second silencing hole is communicated with the second cavity, and the first cavity is located between the second cavity and the side wall portion.

5. The fan blade according to claim 4, wherein the front wall portion has a concave portion recessed toward the inside of the second cavity, a groove is formed in the concave portion, a groove width of the groove gradually decreases in the first direction and in a direction approaching the inside of the second cavity, and the second sound deadening hole is provided in the groove.

6. The fan blade of claim 5, wherein the second silencing holes are multiple and uniformly arranged on the groove.

7. The fan blade according to claim 4, wherein the side wall portion comprises a plurality of first areas, at least two of the first areas are different in wall thickness, the first silencing holes are formed in each of the first areas, and/or the front wall portion comprises a plurality of second areas, at least two of the second areas are different in wall thickness, and the second silencing holes are formed in each of the second areas.

8. The fan blade of claim 4, wherein the diameters of the first and second sound attenuation holes are 1mm or less.

9. The fan blade of claim 4, wherein the shaft portion includes:

a first cylinder provided with the side wall part;

the second cylinder body is arranged in the first cylinder body and is connected with one end of the first cylinder body;

the first cover plate covers the other ends of the second cylinder body and the first cylinder body, and the first cover plate and the first cylinder body together define the first cavity, and the front wall part is arranged on the first cover plate;

the second cover plate covers one end of the second cylinder body, the second cover plate, the second cylinder body and the first cover plate jointly define the second cavity, wherein the shaft hole is formed in the second cover plate, or the shaft hole is formed in the second cover plate and the first cover plate.

10. An air conditioner characterized by comprising a motor and a fan blade, wherein a motor shaft of the motor is arranged in the shaft hole, and the fan blade is the fan blade according to any one of claims 1 to 9.