CN220227275U - Axial flow wind wheel and household appliance - Google Patents

Abstract

The utility model discloses an axial flow wind wheel and household appliances, wherein the axial flow wind wheel comprises a hub and blades, wherein the blades are provided with blade roots and blade tops which are oppositely arranged, and the blade roots are used for being connected with the hub; the blade is provided with a first surface and a second surface along the thickness direction of the blade, at least one of the first surface and the second surface is convexly provided with a plurality of convex cambered surfaces which are arranged at intervals, and a plurality of convex cambered surfaces are arranged at one end of the blade, which is close to the blade tip. According to the technical scheme, the convex cambered surface arranged at one end of the blade close to the blade tip is adopted to guide the air flow, so that the air flow at the position of the blade tip of the blade generates turbulence, the tip vortex of the blade is dispersed, so that the large vortex forms the small vortex, and the noise problem caused by the tip vortex is further improved.

Description

Axial flow wind wheel and household appliance

Technical Field

The utility model relates to the field of air conditioners, in particular to an axial flow wind wheel and household appliances.

Background

The axial flow fan technology is widely used in household appliances all the time, the noise of a fan in a household air conditioner is taken as the most important design index, and when the design of a traditional axial flow wind wheel is matched with a wind guide ring of the air conditioner, the blade tip vortex is obvious due to unavoidable blade top gaps, pneumatic noise is generated, and the falling off and separation of the blade tip vortex are main influencing factors in the noise of the fan.

Disclosure of Invention

The utility model mainly aims to provide an axial flow wind wheel, which aims to solve the problem of noise caused by tip vortex of the axial flow wind wheel.

In order to achieve the above object, the present utility model provides an axial flow wind wheel comprising:

a hub; and

a blade having oppositely disposed blade roots and blade tops, the blade roots being adapted to be coupled to a hub; the blade has along its thickness direction first surface and second surface, and at least one of first surface and second surface is protruding to be equipped with a plurality of protruding cambered surfaces that are the interval setting, and a plurality of protruding cambered surfaces set up the one end that is close to the blade tip at the blade.

In some examples, the first and second surfaces of the blade are cambered surfaces; each convex cambered surface is provided with a cambered top, and the cambered top is provided with a first end close to the top of the blade and a second end far away from the top of the blade; the tangent line of the blade at the second end position of the arc top is a base line, and the base line extends from the hub to the blade top direction; the distance between the arc top of the convex cambered surface and the base line at the corresponding position gradually increases from the blade root to the blade top.

In some examples, the convex arc surface satisfies at least one of the following conditions:

the first surface of the blade top is provided with a convex cambered surface, the direction from the blade root to the blade top is the arc top of the convex cambered surface of the first surface, and the included angle between the arc top of the convex cambered surface and a base line at a corresponding position is not more than 10 degrees;

the second surface of the blade top is provided with a convex cambered surface, and the included angle between the arc top of the convex cambered surface of the second surface and a base line at a corresponding position is not more than 60 degrees from the blade root to the blade top direction.

In some examples, the distance between the end of the convex cambered surface away from the blade tip and the axial center of the axial flow wind wheel is D1, and the outer diameter of the axial flow wind wheel is D2, wherein D1 is not less than 0.8D2.

In some examples, D1 is not greater than 0.95D2.

In some examples, the blade has an upper edge and a lower edge along an axis of the hub, the convex camber being located between the upper edge and the lower edge.

In some examples, the blade has oppositely disposed leading and trailing edges between the blade root and the blade tip, and a plurality of cambered surfaces are spaced from the leading edge toward the trailing edge.

In some examples, the first surface and the second surface are respectively provided with a convex cambered surface, and the convex cambered surfaces of the first surface and the convex cambered surfaces of the second surface are at least partially staggered from each other in the direction from the leading edge to the trailing edge.

In some examples, the first surface is concavely provided with a concave cambered surface at a position corresponding to the convex cambered surface of the second surface, and the second surface is concavely provided with a concave cambered surface at a position corresponding to the convex cambered surface of the first surface, so that the blade tip at least partially forms a wavy structure.

In some examples, the distance between the tops of adjacent two convex cambered surfaces on the same side in the thickness direction of the blade is b, the chord length of the tops of the blades is L from the front edge to the tail edge, and L is more than or equal to 3b.

In some examples, the blade has oppositely disposed leading and trailing edges, a chord length of the tip L from the leading edge toward the trailing edge, and the convex camber meets at least one of the following conditions:

the distance between the arc top of the convex cambered surface close to the front edge and the front edge is not less than 0.1L;

the distance between the arc top of the convex cambered surface close to the tail edge and the tail edge is not less than 0.1L.

In some examples, the blade is integrally provided with the hub, or the blade is removably connected to the hub, or the blade is hot melt connected to the hub.

On the basis of the axial flow wind wheel, the application also provides an example of the household appliance, wherein the example comprises the axial flow wind wheel in any example.

According to the technical scheme, the convex cambered surface arranged at one end of the blade close to the blade tip is adopted to guide the air flow, so that the air flow at the position of the blade tip of the blade generates turbulence, the tip vortex of the blade is dispersed, so that the large vortex forms the small vortex, and the noise problem caused by the tip vortex is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an example of an air conditioner outdoor unit according to the present utility model;

FIG. 2 is a schematic view of an example of an axial flow wind turbine according to the present utility model;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a front view of fig. 2;

FIG. 5 is a schematic view of an exemplary configuration of a tip side of a blade according to the present utility model;

FIG. 6 is a simulated flow field diagram of a conventional axial flow wind turbine CFD;

FIG. 7 is a simulated flow field diagram of an axial flow wind wheel CFD according to the present utility model;

FIG. 8 is a diagram of the wind volume noise of a conventional axial flow wind wheel and an axial flow wind wheel of the present utility model;

fig. 9 is a graph of the wind power of a conventional axial flow wind wheel and an axial flow wind wheel according to the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				1000	Air conditioner	100	Grille
200	Axial flow wind wheel	20	Hub
				21	Blade	211	(Leaf root)
212	Leaf top	213	A first surface
				214	A second surface	215	Convex cambered surface
216	Leading edge	217	Trailing edge
				218	Concave cambered surface	h	Ye Gao
h1	Upper edge	h2	Lower edge of
				L	Chord length	B1、B2	Base line
300	Host machine

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The plurality of means at least two (including two) in the examples of the present utility model.

Axial flow wind wheels are widely used in household appliances such as air conditioners, electric fans, range hoods and the like. The axial flow wind wheel can be matched with the motor, and the motor drives the axial flow wind wheel to rotate so as to enable a specific area on the household appliance to form negative pressure, and then airflow flows along a preset direction.

The axial flow wind wheel generally comprises a hub and blades connected with the hub, wherein the hub can be used for being connected with a motor, and the blades are driven by the hub to rotate relatively. The blade has a blade tip and a blade root, wherein the blade root is used for being connected with the hub, and along the radial direction of the hub, the blade tip is located the one end of blade that is kept away from the blade root. The blade is also provided with a front edge and a tail edge, wherein the front edge and the tail edge are respectively positioned between the top and the root of the blade, the front edge is a pressure surface facing to air flow in the process of relative rotation of the blade under the drive of the hub, and the tail edge and the front edge are arranged oppositely. Taking an example that an axial flow wind wheel is used for a household air conditioner, the distance between a wind guide ring and a blade is more than 7mm due to the reasons of technology, safety standard and the like in the household air conditioner, and the existence of a blade tip clearance easily causes the occurrence of blade tip vortex, which is one of the main reasons for causing aerodynamic noise.

The tip vortex is generated from the edge of the blade in the form of a whole large vortex, then the tip vortex starts to separate from the middle section of the blade to fall off, aerodynamic noise is generated, the larger the vortex is, the larger the noise value is, and the larger the using noise of the axial flow wind wheel is.

The example of the utility model provides an example of an axial flow wind wheel aiming at the problem of loud noise of the axial flow wind wheel caused by tip vortex, the axial flow wind wheel comprises a hub and a blade, the blade is provided with a blade root and a blade top which are oppositely arranged, the blade root is used for being connected with the hub, the blade is provided with a first surface and a second surface along the thickness direction of the blade, at least one of the first surface and the second surface is convexly provided with a plurality of convex cambered surfaces which are arranged at intervals, and the plurality of convex cambered surfaces are arranged at one end of the blade close to the blade top. The tip is located at an end of the blade away from the root, the convex cambered surface in this example is located at an end of the blade near the tip, and the convex cambered surface is located at a surface of the blade in the thickness direction.

By arranging a plurality of convex cambered surfaces on at least one of the first surface or the second surface in the thickness direction of the blade, when the airflow flows along the blade, the large vortex in the tip vortex formed by the blade tip part is dispersed to form the small vortex under the action of the convex cambered surfaces, and the noise of the blade can be reduced with the reduction of the vortex.

Referring to fig. 1, an axial flow wind wheel 200 in the example of the present utility model may be used for a home appliance, and the home appliance is taken as an external air conditioner of an air conditioner 1000 as an example. The air conditioner outdoor unit may further include a main unit 300 and a grille 100, where the axial flow wind wheel 200 and the grille 100 are both installed on the main unit 300, and the axial flow wind wheel 200 is used for driving airflow to flow. Because the axial flow wind wheel 200 is provided with the convex cambered surface 215, when the airflow is at the position of the blade tip 212 close to the position of the blade tip 212 of the blade 21, the large vortex at the blade tip 212 is dispersed to form a plurality of small vortices under the action of the convex cambered surface 215, so that the operation noise of the air conditioner outdoor unit is reduced.

Referring to fig. 2, 3 and 4, in some examples, an example of an axial flow wind turbine 200 is presented, the axial flow wind turbine 200 comprising a hub 20 and blades 21, the blades 21 having oppositely disposed blade roots 211 and blade tips 212, the blade roots 211 being adapted to be coupled to the hub 20; the blade 21 has a first surface 213 and a second surface 214 along a thickness direction thereof, at least one of the first surface 213 and the second surface 214 is convexly provided with a plurality of convex cambered surfaces 215 arranged at intervals, and the plurality of convex cambered surfaces 215 are arranged at one end of the blade 21 near the tip 212.

The hub 20 may have a cylindrical structure, and the hub 20 has an outer circumferential surface.

The blade 21 has a blade root 211 and a blade tip 212, the blade root 211 and the blade tip 212 being located at opposite ends of the blade 21, respectively, wherein the blade root 211 of the blade 21 may be connected to the outer circumferential surface of the hub 20 and the blade tip 212 is located away from the hub 20.

The blade 21 has a first surface 213 and a second surface 214 in the thickness direction, and, as an example of the state shown in fig. 2, the first surface 213 may be an upper surface of the blade 21 and the second surface 214 may be a lower surface of the blade 21.

The convex arc surface 215 is an arc surface protruding toward the thickness direction of the blade 21 on the surface of the blade 21, and the convex arc surface 215 is located at one end of the blade 21 near the tip 212. In some examples, the convex cambered surface 215 may be a bulge formed by bulge of the blade 21 in the thickness direction, the bulge surface forms the convex cambered surface 215, and the overall thickness of the part of the blade 21 having the convex cambered surface 215 may be increased; in some examples, one end portion of the blade 21 near the tip 212 is arched in the thickness direction, the surface of the arched portion forms a convex cambered surface 215, and the overall thickness of the portion of the blade 21 having the convex cambered surface 215 is unchanged; in some examples, a bump is provided at an end of the blade 21 near the tip 212, the bump is provided on a surface of the blade 21 in a thickness direction, and an outer surface of the bump forms a convex arc surface 215.

The convex arc surface 215 is provided on a surface in the thickness direction of the blade 21, and the blade 21 includes a first surface 213 and a second surface 214 in the thickness direction. In some examples, the first surface 213 of the blade 21 is provided with the convex cambered surface 215 described above; in some examples, the second surface 214 of the blade 21 is provided with the convex cambered surface 215; in some examples, the first surface 213 and the second surface 214 of the blade 21 are each provided with the convex camber 215 described above.

The number of the convex cambered surfaces 215 is a plurality, and the plurality of convex cambered surfaces 215 are arranged at intervals. The blade 21 has a leading edge 216 and a trailing edge 217, the leading edge 216 and the trailing edge 217 being located between the blade root 211 and the blade tip 212, the leading edge 216 and the trailing edge 217 being the front and rear ends of the blade 21 in the circumferential direction of the hub 20. In this example, the plurality of convex cambered surfaces 215 may be disposed at intervals in the direction from the leading edge 216 to the trailing edge 217 of the blade 21, and the distances between the plurality of convex cambered surfaces 215 and the axis of the hub 20 may be equal, or alternatively, the distances between the plurality of cam surfaces and the axis of the hub 20 may be unequal.

Referring to fig. 4 and 5, the convex cambered surface 215 is disposed at an end of the blade 21 near the tip 212, and the tip 212 is an end of the blade 21 away from the hub 20, i.e., the convex cambered surface 215 is disposed away from the hub 20. In this example, the convex cambered surface 215 may be formed by arching one end of the blade 21 close to the blade tip 212 toward the thickness direction of the blade 21, wherein one end of the blade 21 close to the blade tip 212 may arch toward the first surface 213 side, one end of the blade 21 close to the blade tip 212 may also arch toward the second surface 214 side, and one end of the blade 21 close to the blade tip 212 may arch toward both sides in the thickness direction respectively to form the convex cambered surface 215 on both sides in the thickness direction respectively.

Referring to fig. 6, by obtaining a CFD (Computational Fluid Dynamics ) simulated flow field diagram of a conventional axial flow wind turbine 200, one end of a blade 21 of the conventional axial flow wind turbine 200, which is close to a tip 212, is of a smooth structure, and when the axial flow wind turbine rotates, a tip 212 of the blade 21 generates a larger tip vortex.

Referring to fig. 7, the blade 21 of the axial flow wind wheel 200 of the present utility model is close to one end of the blade top 212, and under the action of the convex cambered surface 215, the airflow is affected by the convex cambered surface 215 at the blade top 212 of the blade 21, so that the airflow is dispersed and guided, the larger tip vortex is dispersed to form a plurality of small vortices, and the noise of the axial flow wind wheel is reduced along with the dispersion and reduction of the tip vortex.

Referring to fig. 8, where the fold line T3 is the air volume noise of the existing axial flow wind wheel 200, and T4 is the air volume noise of the axial flow wind wheel 200 of the present utility model, as shown in fig. 8, under the same air volume, the present utility model adopts the convex arc surface 215 design, and the larger tip vortex is dispersed into small vortex, so that the overall noise of the axial flow wind wheel 200 is reduced by about 1.5 dB.

When the vortex is generated in the airflow, the airflow is disturbed, so that the wind resistance is increased, the air quantity of the part with the vortex is reduced, the larger the area of the vortex part is, the lower the flow of the airflow is, and the energy consumption of the axial flow wind wheel 200 is required to be correspondingly improved to ensure the higher air quantity, so that the power consumption of the product is improved.

Referring to fig. 9, a broken line T1 is an air volume power diagram of the present utility model, and T2 is an air volume power diagram of the conventional axial flow wind turbine 200. The large vortex of the tip vortex is dispersed to form the small vortex, so that the wind resistance of the blade top 212 position of the axial flow wind wheel is reduced, and the power of the axial flow wind wheel is about 8% higher than that of the existing axial flow wind wheel 200 on the premise of the same air quantity.

Because the blade 21 has less work near the tip 212, the work in the middle of the blade 21 is greater. In the example of the present utility model, the convex arc surface 215 is only disposed at one end of the blade 21 near the blade tip 212, and the convex arc surface 215 is not disposed at the middle part of the blade 21, so that the influence on the work of the main machine 300 structure of the blade 21 can be reduced on the premise of reducing noise and wind resistance.

Referring to fig. 2, in some examples, the first surface 213 and the second surface 214 of the blade 21 are cambered surfaces; each convex arc surface 215 has an arc tip with a first end proximate to tip 212 and a second end distal to tip 212; the tangent line of the blade 21 at the second end position of the arc tip is a base line, and the base line extends from the hub 20 to the direction of the blade tip 212; the distance between the tip of the convex cambered surface 215 and the base line at the corresponding position gradually increases from the blade root 211 toward the tip 212.

The first surface 213 and the second surface 214 of the blade 21 are cambered surfaces, which means that the first surface 213 and the second surface 214 of the blade 21 are non-planar, and the first surface 213 and the second surface 214 of the blade 21 may be cambered surfaces parallel to each other, so that the thickness of the blade 21 is uniform, and the first surface 213 and the second surface 214 of the blade 21 may also be non-parallel cambered surfaces, so that the thickness of the blade 21 at different positions changes, so as to improve the structural strength of the blade 21 at different positions.

The convex cambered surfaces 215 have arc tops, which are top ends of the convex cambered surfaces 215, and each convex cambered surface 215 has one arc top. Wherein, the arc top of the convex arc surface 215 positioned on the first surface 213 is the highest position of the convex arc surface 215 protruding on the corresponding first surface 213; the arc top of the convex arc surface 215 located on the second surface 214 is the highest position of the convex arc surface 215 on the corresponding second surface 214. The first end of the arc top is a position of the arc top close to the blade top, and the second end of the arc top is opposite to the first end. The base line is a tangent line of the blade at the position of the second end of the arc top of the convex arc surface 215, and the base line extends from the hub to the direction of the blade top.

The gradually increasing distance between the tip of at least part of the convex cambered surface 215 and the base line at the corresponding position from the blade root 211 to the tip 212 means that at least part of the convex cambered surface 215 protrudes in the thickness direction to form a convex cambered surface 215 for one end of the blade 21 close to the tip 212, and the protruding angle of the convex cambered surface 215 gradually increases from the blade root 211 to the tip 212.

As shown in fig. 2, a convex cambered surface 215 is provided on the first surface 213 as an example, wherein a base line at a position corresponding to one convex cambered surface 215 is B1, an included angle between an arc top of the convex cambered surface 215 and the base line B1 is α, and an angle of α gradually increases from the blade root 211 toward the blade top 212.

As shown in fig. 2, a convex cambered surface 215 is provided on the second surface 214, where a base line at a position corresponding to one convex cambered surface 215 is B2, an included angle between an arc top of the convex cambered surface 215 and the base line B2 is β, and the angle of β gradually increases from the blade root 211 toward the blade top 212.

The arc tip of the convex cambered surface 215 in this example extends from the blade root 211 toward the tip 212, and the angle of the arc tip gradually increases so that the airflow is gradually directed outward of the tip 212 along the convex cambered surface 215 to reduce tip vortices generated outside the tip 212 as the airflow flows along the blade 21. Because the plurality of convex cambered surfaces 215 are arranged at intervals, the plurality of convex cambered surfaces 215 respectively disperse and guide the airflow flowing along the blade 21 to the outer side of the blade tip 212, so that the airflow is in a more dispersed state under the action of the convex cambered surfaces 215, and larger blade tip vortex is not easy to generate at the position of the blade tip 212.

Optionally, the plurality of convex cambered surfaces 215 in this example are located on the first surface 213, and angles between the tops of the plurality of convex cambered surfaces 215 and the base line at the corresponding positions thereof may be equal or unequal; optionally, the convex cambered surfaces 215 in this example are located on the first surface 213, and angles between the tops of the convex cambered surfaces 215 and the base line at the corresponding positions may be equal or unequal.

With continued reference to fig. 2, in some examples, the first surface 213 of the tip 212 may be formed with a convex arc 215, and the arc of the convex arc 215 of the first surface 213 may not form an angle of more than 10 ° from the baseline at the corresponding location, from the root 211 toward the tip 212.

Taking the upper surface of the blade 21 as shown in fig. 2 as the first surface 213, an included angle between the arc top of the convex cambered surface 215 of the first surface 213 and the base line B1 at the corresponding position is α, where α does not exceed 10 °, so as to reduce wind resistance when the axial flow wind wheel rotates, reduce energy consumption of the axial flow wind wheel, and improve energy utilization rate of the axial flow wind wheel. The included angle α in this example may be 10 °, 8 °, 5 °, 3 °, or any other value not exceeding 10 °.

With continued reference to FIG. 2, in some examples, the second surface 214 of the tip 212 may define a convex arc surface 215, such that the arc tip of the convex arc surface 215 of the second surface 214 may not be more than 60 from the baseline at the corresponding location, from the root 211 toward the tip 212.

Taking the lower surface of the blade 21 as the second surface 214 in fig. 2 as an example, the included angle between the arc top of the convex cambered surface 215 of the second surface 214 and the limit B2 at the corresponding position is β, where β does not exceed 60 °, so as to reduce the wind resistance of the axial flow wind wheel and improve the wind volume of the axial flow wind wheel 200. The included angle β in this example may be 60 °, 55 °, 50 °, 45 °, 40 °, 35 °, 30 °, or any other value not exceeding 60 °.

With continued reference to fig. 2, in some examples, the first surface 213 and the second surface 214 of the tip 212 are each formed with a convex arc surface 215, and an angle between an arc top of the convex arc surface 215 of the first surface 213 and a base line at a corresponding position is not more than 10 ° and an angle between an arc top of the convex arc surface 215 of the second surface 214 and a base line at a corresponding position is not more than 60 ° from the blade root 211 toward the tip 212.

In this example, the convex cambered surfaces 215 are formed on the first surface 213 and the second surface 214 respectively, so that the convex cambered surfaces 215 on the first surface 213 and the second surface 214 can act on the airflow together, so that the larger tip vortex of the airflow at the position of the blade top 212 is dispersed to form a plurality of smaller small vortices, thereby reducing the wind resistance of the axial flow wind wheel and reducing the noise of the axial flow wind wheel.

With continued reference to fig. 3, in some examples, a distance between an end of the convex cambered surface 215 away from the tip 212 and the axial center of the axial flow wind turbine 200 is D1, and an outer diameter of the axial flow wind turbine 200 is D2, where D1 is not less than 0.8D2.

In the rotation process of the axial flow wind wheel 200, the work done by the blades 21 within 80% of the diameter of the axial flow wind wheel 200 is relatively larger, and the influence on the wind volume and the air supply efficiency of the axial flow wind wheel 200 is larger.

In this example, the axial flow wind wheel 200 has an outer diameter D2, the distance between the end of the convex cambered surface 215 away from the blade tip 212 and the axis of the hub 20 is D1, and the length of the convex cambered surface 215 may be from the blade root 211 to the blade tip 212 _△ D。

Optionally, in some examples, D1 is not greater than 0.95D2 to improve the problem of reduced airflow guiding caused by convex camber surface 215 being too close to tip 212 of blade 21, so that convex camber surface 215 can have better drainage and splitting effects to reduce greater tip vortex at tip 212.

Referring to fig. 4 and 5, in some examples, the blades 21 have an upper edge and a lower edge along the axial direction of the hub 20, with the convex camber 215 being located between the upper edge and the lower edge.

Along the axial direction of the hub 20, the upper edge of the blade 21 may be h1 as shown in fig. 5, the lower edge of the blade 21 may be h2 as shown in fig. 5, the convex cambered surface 215 is located between the upper edge and the lower edge of the blade 21, and when the position of the convex cambered surface 215 protrudes from the upper edge or the lower edge during the airflow along the blade 21, the input wind resistance and the output wind resistance of the airflow of the convex cambered surface 215 increase, which may possibly result in a decrease in the air volume of the axial flow wind wheel 200. In this example, the convex cambered surface 215 is located between the upper edge and the lower edge, so as to reduce wind resistance of the convex cambered surface 215 to the blades 21, reduce wind resistance of air flow input and output, help to raise the air volume of the axial flow wind wheel 200, and reduce the power consumption of the axial flow wind wheel 200.

Referring to fig. 3-5 in combination, in some examples, the blade 21 has a leading edge 216 and a trailing edge 217 disposed opposite each other, the leading edge 216 and the trailing edge 217 being disposed between the blade root 211 and the blade tip 212, and a plurality of cambered surfaces 215 being spaced from the leading edge 216 toward the trailing edge 217.

The plurality of convex cambered surfaces 215 in this example are arranged at intervals along the extending direction of the blade tip 212, when the airflow flows along the blade 21, the airflow is acted by the convex cambered surfaces 215 when the blade tip 212 of the blade 21 is positioned, so that the airflow is dispersed and guided by the plurality of convex cambered surfaces 215, and a plurality of dispersed tip vortices are formed at the blade tip 212, and the noise of the axial flow wind wheel 200 can be reduced. Since the plurality of convex cambered surfaces 215 are arranged at intervals from the front edge 216 to the tail edge 217, the plurality of convex cambered surfaces 215 can be conveniently processed on the blade 21, and the processing performance of the blade 21 is improved.

In some examples, the first surface 213 and the second surface 214 are respectively provided with a convex arc surface 215, and the convex arc surface 215 of the first surface 213 and the convex arc surface 215 of the second surface 214 are at least partially staggered from each other from the leading edge 216 to the trailing edge 217.

In this example, convex cambered surfaces 215 are disposed on the first surface 213 and the second surface 214, so that the convex cambered surfaces 215 on the first surface 213 and the convex cambered surfaces 215 on the second surface 214 cooperate, so that tip vortices generated at the tip 212 are dispersed to form multiple small vortices, so as to improve the noise reduction effect of the axial flow wind wheel 200.

Referring to fig. 4 and 5, in some examples, a concave cambered surface 218 is concavely disposed on the first surface 213 corresponding to the convex cambered surface 215 of the second surface 214, and a concave cambered surface 218 is concavely disposed on the second surface 214 corresponding to the convex cambered surface 215 of the first surface 213, so that the blade tip 212 at least partially forms a wavy structure.

In this example, the convex cambered surface 215 on the first surface 213 corresponds to the concave cambered surface 218 on the second surface 214, and the concave cambered surface 218 on the first surface 213 corresponds to the convex cambered surface 215 on the second surface 214, so that the position of the blade 21 close to the blade tip 212 forms a wavy structure, which can facilitate the processing of the blade 21, and the blade 21 can maintain a relatively fixed thickness at the position of the blade tip 212 of the blade 21, so as to improve the structural strength of the blade 21, and reduce the problem of abrupt structural strength change caused by thickness variation of the blade 21. When the blade 21 is formed by adopting an integral forming mode, the processing of the blade 21 die can be facilitated, and the processing performance of the blade 21 is improved.

The wave-like structure in this example extends along the leading edge 216 of the blade 21 in the direction of the trailing edge 217 so that the tip 212 of the blade 21 may form a relatively stable wave-like configuration.

Referring to FIGS. 4 and 5, the distance between the tops of two adjacent convex cambered surfaces 215 on the same side in the thickness direction of the blade 21 is b, and the chord length of the tip 212 is L from the leading edge 216 to the trailing edge 217, wherein L is equal to or greater than 3b.

The chord length of the tip 212 in this example is L, i.e., the linear distance from the leading edge 216 toward the trailing edge 217 is L.

The distance between the arc tops of two adjacent convex cambered surfaces 215 is b, the position of the blade top 212 is provided with a wavy structure, and the arc tops of two adjacent convex cambered surfaces 215 positioned on the same side are the distances between two adjacent wave crests or two adjacent wave troughs of the wavy structure. In this example, the chord length of the blade top 212 is defined to be not less than three times of the distance between two adjacent peaks or two adjacent valleys of the wavy structure, so that the wavy structure can fully act on the airflow, and the larger blade tip vortex is dispersed to form a plurality of smaller blade tip vortices, so that wind resistance and noise of the axial flow wind wheel 200 are reduced.

Referring to FIG. 5, in some examples, the blade 21 has a leading edge 216 and a trailing edge 217 disposed opposite each other, a chord length L of the tip 212 from the leading edge 216 toward the trailing edge 217, and a distance between the tip of the convex cambered surface 215 near the leading edge 216 and the leading edge 216 is not less than 0.1L; when the distance between the arc top of the convex arc surface 215 near the front edge 216 and the front edge 216 in this example is smaller than 0.1L, the wind resistance of the position of the blade 21 near the front edge 216 increases due to the blocking of the position near the front edge 216 by the convex arc surface 215 when the airflow enters the blade 21, and thus the air volume of the blade 21 is easily reduced. By defining the distance between the convex camber surface 215 near the leading edge 216 and the leading edge 216 in this example, the convex camber surface 215 can be used to reduce noise caused by tip vortices of the blades 21 while reducing wind resistance of the axial flow wind turbine 200.

Referring to FIG. 5, in some examples, the blade 21 has a leading edge 216 and a trailing edge 217 disposed opposite each other, a chord length L of the tip 212 from the leading edge 216 toward the trailing edge 217, and a distance between the tip and the trailing edge 217 of the convex cambered surface 215 near the trailing edge 217 is not less than 0.1L. When the distance between the top of the convex arc surface 215 near the trailing edge 217 and the leading edge 216 in this example is smaller than 0.1L, the position near the trailing edge 217 is blocked by the convex arc surface 215 when the airflow enters the blade 21, so that the wind resistance of the position near the trailing edge 217 of the blade 21 increases, and the wind volume of the blade 21 is easily reduced. By defining the distance between the convex cambered surface 215 near the trailing edge 217 and the trailing edge 217 in this example, the convex cambered surface 215 may be used to reduce noise caused by tip vortices of the blade 21 while reducing wind resistance of the axial flow wind turbine 200.

Referring to FIG. 5, in some examples, the blade 21 has a leading edge 216 and a trailing edge 217 disposed opposite each other, a chord length L of the tip 212 from the leading edge 216 toward the trailing edge 217, an arc tip of the convex camber 215 near the leading edge 216 at a distance of not less than 0.1L from the leading edge 216, and an arc tip of the convex camber 215 near the trailing edge 217 at a distance of not less than 0.1L from the trailing edge 217.

In this example, by defining the positions of the convex cambered surfaces 215 near the positions of the leading edge 216 and the trailing edge 217 of the blade 21, respectively, the air inlet resistance and the air outlet resistance of the blade 21 can be reduced, thereby improving the air outlet quantity of the axial flow wind wheel 200 and reducing the noise of the axial flow wind wheel 200.

In some examples, blades 21 are integrally provided with hub 20. The blades 21 in this example may be integrally formed with the hub 20 by using a mold, or may be formed with the hub 20 by using other integral forming methods, so as to improve the workability of the axial flow wind turbine 200 and improve the structural strength of the joint between the blades 21 and the hub 20.

In some examples, the blades 21 are detachably connected to the hub 20, and in this example, the blades 21 and the hub 20 may be connected to each other by bolting, clamping or other connection methods. By adopting a detachable connection mode, the blades 21 and the hub 20 can be independently formed, so that the processing equipment is simplified; when the blade 21 or the hub 20 is damaged or has a machining error, the blade or the hub can be conveniently replaced independently.

In some examples, blades 21 are hot melt connected to hub 20. In this example, the blade 21 and the hub 20 may be separately formed, and the blade 21 may be connected to each other by heat fusion, welding, or the like, so that the blade 21 and the hub 20 form an integral structure to enhance the connection strength of the connection between the blade 21 and the hub 20. Since the blades 21 and the hub 20 can be formed separately, workability of the blades 21 and the hub 20 can be effectively improved.

Referring to fig. 1, the present utility model further proposes an example of a home appliance based on the axial flow wind wheel 200, where the home appliance includes the axial flow wind wheel 200 according to any one of the examples.

The home appliance in this example may be an air conditioner 1000, a fan, or other device employing an axial flow wind turbine 200. It may be appreciated that the home appliance described in this example may further include other functional components, which are not described herein.

It should be noted that, since the example of the home appliance of the present utility model is based on the example of the axial flow wind wheel 200, the example of the home appliance of the present utility model includes all the technical solutions of all the examples of the axial flow wind wheel 200, and the achieved technical effects are identical, and are not repeated herein.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (12)

1. An axial flow wind wheel, characterized by comprising

A hub; and

a blade having oppositely disposed blade roots and blade tips, the blade roots being adapted to connect to the hub; the blade is provided with a first surface and a second surface along the thickness direction of the blade, at least one of the first surface and the second surface is convexly provided with a plurality of convex cambered surfaces which are arranged at intervals, and a plurality of convex cambered surfaces are arranged at one end of the blade, which is close to the blade tip.

2. The axial flow wind wheel of claim 1, wherein the first and second surfaces of the blade are cambered surfaces; each convex cambered surface is provided with a cambered top, and the cambered top is provided with a first end close to the top of the leaf and a second end far away from the top of the leaf; a tangent line of the blade at a second end position of the arc top is a base line, and the base line extends from the hub to the blade top direction; and the distance between the arc top of the convex cambered surface and the base line at the corresponding position is gradually increased from the blade root to the blade top.

3. The axial flow wind wheel of claim 2, wherein said convex cambered surface satisfies at least one of the following conditions:

the convex cambered surface is formed on the first surface of the blade top, and the included angle between the arc top of the convex cambered surface of the first surface and the base line at the corresponding position is not more than 10 degrees from the blade root to the blade top direction;

the second surface of the blade top is provided with the convex cambered surface, and the included angle between the arc top of the convex cambered surface of the second surface and the base line at the corresponding position is not more than 60 degrees from the blade root to the blade top direction.

4. The axial flow wind wheel according to claim 1, wherein a distance between an end of the convex cambered surface away from the blade tip and an axial center of the axial flow wind wheel is D1, and an outer diameter of the axial flow wind wheel is D2, wherein D1 is not less than 0.8D2.

5. The axial flow wind wheel of claim 4, wherein D1 is no greater than 0.95D2.

6. The axial flow wind wheel of claim 1, wherein said blades have an upper edge and a lower edge along an axial direction of said hub, said convex cambered surface being located between said upper edge and said lower edge.

7. The axial flow wind wheel of any one of claims 1 to 6, wherein said blades have oppositely disposed leading and trailing edges, said leading and trailing edges being located between said blade root and said blade tip, a plurality of said convex cambered surfaces being spaced from said leading edge in a direction toward said trailing edge.

8. The axial flow wind wheel of claim 7, wherein the first surface and the second surface are respectively provided with the convex cambered surfaces, and the convex cambered surfaces of the first surface and the convex cambered surfaces of the second surface are at least partially staggered from each other from the leading edge to the trailing edge.

9. The axial flow wind wheel of claim 7, wherein the first surface is concavely provided with a concave cambered surface at a position corresponding to the convex cambered surface of the second surface, and the second surface is concavely provided with a concave cambered surface at a position corresponding to the convex cambered surface of the first surface, so that the blade tip at least partially forms a wavy structure.

10. The axial flow wind wheel according to claim 9, wherein a distance between the tops of adjacent convex cambered surfaces on the same side in the thickness direction of the blade is b, a chord length of the tops of the blade is L from the leading edge to the trailing edge, and L is equal to or greater than 3b.

11. The axial flow wind wheel according to any one of claims 1 to 6, wherein the blades have oppositely disposed leading and trailing edges, a chord length of the tip being L from the leading edge toward the trailing edge, the convex cambered surface satisfying at least one of the following conditions:

the distance between the arc top of the convex cambered surface close to the front edge and the front edge is not less than 0.1L;

the distance between the arc top of the convex cambered surface close to the tail edge and the tail edge is not less than 0.1L.

12. An electrical household appliance comprising an axial flow wind turbine as claimed in any one of claims 1 to 11.