CN214274041U

CN214274041U - Fan blade, centrifugal fan and clothes treatment device

Info

Publication number: CN214274041U
Application number: CN202023326850.0U
Authority: CN
Inventors: 张琦
Original assignee: Wuxi Little Swan Electric Co Ltd
Current assignee: Wuxi Little Swan Electric Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-24
Anticipated expiration: 2030-12-31

Abstract

An embodiment of the utility model provides a fan blade, centrifugal fan and clothing processing apparatus, fan blade includes: a pressure side and a suction side; and the concave part is arranged on at least one of the pressure surface and the suction surface. The concave part is arranged on at least one of the pressure surface and the suction surface of the fan blade, so that turbulence disturbance of airflow at an original separation point can be enhanced, the airflow separation point is moved backwards, airflow is delayed to be separated, the separation area is reduced, flow resistance of the airflow in an airflow flow channel is reduced, and fan efficiency and fan flow are improved.

Description

Fan blade, centrifugal fan and clothes treatment device

Technical Field

The embodiment of the utility model relates to a fan equipment technical field particularly, relates to a fan blade, a centrifugal fan and a clothing processing apparatus.

Background

At present, the application range of the centrifugal fan is wide, and the centrifugal fan is used in a clothes dryer, a dust collector, a blower and the like in the household appliance industry. Current centrifugal fan designs are essentially smooth blade. When the centrifugal fan works, airflow is easy to flow and separate in the blade flow channel, vortex is generated, the resistance of the blade flow channel is increased, and the flow and the efficiency of the fan are reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model aims at solving one of the technical problem that exists among the prior art at least.

To this end, a first aspect of embodiments of the present invention provides a fan blade.

A second aspect of the embodiments of the present invention provides a centrifugal fan.

A third aspect of embodiments of the present invention provides a laundry treating apparatus.

In view of this, according to the first aspect of the embodiment of the utility model, a fan blade is provided, fan blade includes: a pressure side and a suction side; and the concave part is arranged on at least one of the pressure surface and the suction surface.

The embodiment of the utility model provides a fan blade includes the pressure surface, suction surface and depressed part, particularly, set up the depressed part on at least one in fan blade's pressure surface and suction surface, can understand, fan blade's pressure surface is fan operation in-process, fan blade's windward side, fan blade's suction surface is the fan in service, fan blade's leeward side, form the runner of air current between two adjacent fan blade, the air current that the fan operation produced flows to the spiral case of fan in through the air current runner, and flow by the air outlet of spiral case. In detail, the concave part can be arranged on the pressure surface of the fan blade, the concave part can also be arranged on the suction surface of the fan blade, and of course, the concave parts can also be arranged on the pressure surface and the suction surface of the fan blade, and the concave parts can be specifically arranged according to actual needs. When the centrifugal fan in the related art works, airflow is easy to generate flow separation of the airflow in the airflow channel, and then eddy current is generated in the airflow channel, so that the flow resistance of the airflow in the airflow channel is increased, and the flow and the efficiency of the fan are reduced. The concave part is arranged on at least one of the pressure surface and the suction surface of the fan blade, so that turbulence disturbance of airflow at an original separation point can be enhanced, the airflow separation point is moved backwards, airflow is delayed to be separated, the separation area is reduced, flow resistance of the airflow in an airflow flow channel is reduced, and fan efficiency and fan flow are improved.

It can be understood that, in the operation process of the fan, the separation degree of the air flow generated by the pressure surface and the suction surface of the fan blade is different, and the flow separation phenomenon generated by the suction surface of the fan blade is obvious, so that the suction surface of the fan blade can be provided with a concave part to form turbulent flow on the air flow in the wall-near area of the concave part, and the purpose of reducing the flow resistance of the air flow in the air flow channel is achieved.

Additionally, according to the utility model discloses above-mentioned technical scheme provides a fan blade still has following additional technical characteristic:

in one possible design, the recess comprises at least one groove, which extends in the axial direction of the fan.

In this design, it includes at least one recess to have injectd the depressed part, has injectd the concrete structure of the depressed part that sets up on the fan blade promptly, specifically, the recess extends along the axial direction of fan, can effectively strengthen the turbulent disturbance of air current at former separation point to move backward the air current separation point, can eliminate or weaken the flow separation of air current in the air current runner promptly, and then reduce the flow resistance of air current in the air current runner, improve fan efficiency and fan flow.

It can be understood that the number of the grooves can be set to be a plurality of, that is, a plurality of grooves are distributed on at least one of the pressure surface and the suction surface of the fan blade, so that turbulence disturbance of airflow can be further enhanced, a separation point is delayed, a separation area is reduced, flow resistance of the airflow in an airflow channel is reduced, and fan efficiency and fan flow are improved. The number of the specific grooves can be set according to actual needs.

In one possible design, the groove extends in the axial direction of the fan and through the fan blade.

In this design, it extends and link up the fan blade to have injectd the recess along the axial direction of fan, and in detail, the recess link up the setting along the fan axial, can be at the turbulence disturbance of reinforcing fan blade nearly wall district air current to postpone the air current separation point, promote on the basis of fan operating efficiency and the amount of wind, the fan blade of being convenient for is demoulded in the manufacturing process, and then reduces the manufacturing degree of difficulty of fan blade, promotes production efficiency, reduces the manufacturing cost of fan blade.

In one possible design, the depression comprises at least one indentation.

In the design, the concave part is limited to comprise at least one pit, namely, the specific structure of the concave part arranged on the fan blade is limited, specifically, at least one pit is arranged on at least one of the pressure surface and the suction surface of the fan blade, so that the turbulence disturbance of the airflow at the original separation point can be effectively enhanced, the airflow separation point is moved backwards, the flow separation of the airflow in the airflow channel can be eliminated or weakened, the flow resistance of the airflow in the airflow channel is reduced, and the fan efficiency and the fan flow are improved.

It can be understood that the number of the pits can be set to be a plurality of, that is, a plurality of pits are distributed on at least one of the pressure surface and the suction surface of the fan blade, so that the turbulence disturbance of the airflow can be further enhanced, the separation point is delayed, the separation area is reduced, the flow resistance of the airflow in the airflow channel is reduced, and the fan efficiency and the fan flow are improved. The number of the specific pits can be set according to actual needs.

In one possible design, the depression is provided in the suction surface.

In the design, the concave part is specifically limited to be arranged on the suction surface, and it can be understood that in the operation process of the fan, the separation degree of the air flow generated by the pressure surface and the suction surface of the fan blade is different, wherein the flow separation phenomenon generated by the air flow in the air flow channel is generally concentrated on the suction surface of the fan blade, and the turbulent disturbance of the air flow at the original separation point of the suction surface can be effectively enhanced by arranging the concave part on the suction surface of the fan blade, so that the purpose of reducing the flow resistance of the air flow in the air flow channel is achieved.

In a possible design, the fan blade further comprises a first end, the first end is located at one end, close to the axis of the fan, of the fan blade, wherein a circle which penetrates through the first end and is concentric with the outer edge of the fan is set as a first reference circle, and an angle alpha formed by a tangent plane of the suction surface passing through the first end and a tangent plane of the first reference circle penetrating through the first end is larger than or equal to 0 degree and smaller than or equal to 45 degrees.

In this design, it still includes first end to have injectd fan blade, and first end is the one end that fan blade is close to fan axle center, and in detail, the contained angle that the tangent plane of suction surface of fan blade is between the tangent plane on first end and the tangent plane of passing the first reference circle of first end is fan blade's entry angle, the entry angle when fan operation in-process, air current flow in air current runner promptly. In the related art, airflow flowing in the blade is observed from an absolute coordinate system, and the airflow is considered to flow into an airflow channel of the fan blade along the radial direction, so that the blade inlet design is basically kept in the radial direction for reducing the flow loss, namely, the blade inlet angles are large, so that the impact loss of the airflow on the blade is large when the fan works, the vortex in the airflow channel of the blade is obvious, the flow resistance of the airflow is large, and the efficiency of the fan is reduced. If the coordinate system is viewed on the rotating blade, the airflow enters the airflow path of the fan blade substantially in the circumferential direction of the fan wheel. The air current direction of motion based on impeller coordinate system sets up the entry angle of fan blade, be about to the air current entry angle of fan blade and inject between 0 to 45, that is to say, less with the air current entry angle of fan blade is injectd, can make the air current gentle excessively at the pressure surface and the suction surface of fan blade, thereby can reduce the air current and produce the impact at flow in-process, and can reduce the emergence of vortex phenomenon, and then can effectively reduce the impact loss and the vortex loss of air current at fan blade entrance, further improve fan efficiency and fan flow.

It can be understood that, if the inlet angle of the fan blade is too large, that is, the inlet of the fan blade is distributed approximately along the radial direction of the fan impeller, so that the airflow can generate large impact on the pressure surface of the inlet of the fan blade when flowing, thereby causing impact loss, reducing the air quantity, and through designing the inlet angle of the fan blade to be small, the airflow can be gentle and excessive on the pressure surface and the suction surface of the fan blade, thereby reducing the impact generated by the airflow in the flowing process, and reducing the occurrence of the eddy current phenomenon.

In a possible design, the fan blade further comprises a second end, the second end is located at one end of the fan blade far away from the axis of the fan, a circle which penetrates through the second end and is concentric with the outer edge of the fan is set as a second reference circle, and an angle beta formed by a tangent plane of the pressure surface passing through the second end and a tangent plane of the second reference circle penetrating through the second end satisfies that beta is greater than or equal to 0 degree and less than or equal to 45 degrees.

In this design, it still includes the second end to have limited fan blade, and the second end is the one end that fan blade kept away from fan axle center, and in detail, the contained angle that forms between the tangent plane of pressure face on the second end of fan blade and the tangent plane of the second reference circle that passes the second end is fan blade's export angle, the export angle when fan operation in-process, air current outflow air current runner promptly. Because the impeller and the blades of the fan are arranged in the volute, airflow generated in the running process of the fan flows in through the inlet of the airflow channel and flows out to the volute through the outlet of the airflow channel, and it can be understood that if the outlet angle of the fan blades is large, the inner wall of the volute generates large impact when the airflow flows out, and then the loss of air volume is caused, namely the air volume of the fan is reduced. The airflow outlet angle of the fan blade is limited between 0 degree and 45 degrees, namely, the airflow outlet angle of the fan blade is limited to be small, so that airflow can flow along the inner wall of the volute when passing through the outlet of the airflow channel, the impact generated on the inner wall of the volute when the airflow flows out is reduced, the air volume in the running process of the fan is increased, and the efficiency of the fan is improved.

According to the utility model discloses a second aspect provides a centrifugal fan, include the fan blade that provides like above-mentioned arbitrary technical scheme, therefore possess whole beneficial technological effects of this fan blade, no longer give consideration to here.

Additionally, according to the utility model discloses above-mentioned technical scheme provides a centrifugal fan still has following additional technical characteristic:

in one possible design, the centrifugal fan further includes an impeller, a volute, and an air outlet, wherein the plurality of fan blades are disposed on the impeller, the impeller and the plurality of fan blades are disposed in the volute, and the air outlet is communicated with the volute.

In this design, it still includes impeller, spiral case and air outlet to have injectd centrifugal fan, specifically speaking, a plurality of fan blades and impeller set up in the spiral case, and the air current that the fan operation produced flows out to the spiral case of fan in the air current runner to by the air outlet outflow of spiral case.

According to the utility model discloses a third aspect provides a clothes treatment device, include the centrifugal fan that provides like above-mentioned arbitrary technical scheme, therefore possess this centrifugal fan's whole beneficial technological effect, no longer give consideration to here.

Additional aspects and advantages in accordance with the invention 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 invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

FIG. 2 shows an enlarged partial view of the centrifugal fan of the embodiment of FIG. 1 at A;

fig. 3 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

FIG. 4 shows an enlarged partial view of the centrifugal fan of the embodiment of FIG. 3 at B;

fig. 5 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

FIG. 6 shows an enlarged partial view of the centrifugal fan of the embodiment of FIG. 5 at C;

fig. 7 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

fig. 8 shows one of the schematic structural views of a fan blade according to an embodiment of the invention;

fig. 9 shows a second schematic structural view of a fan blade according to an embodiment of the invention;

fig. 10 shows a third schematic structural view of a fan blade according to an embodiment of the present invention;

fig. 11 shows a fourth schematic structural view of a fan blade according to an embodiment of the present invention;

fig. 12 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

fig. 13 is a schematic diagram showing a comparison between a fan blade according to an embodiment of the present invention and an air volume in the related art;

FIG. 14 illustrates a schematic view of a fan blade in comparison to a Yang stroke in the related art, according to an embodiment of the present invention;

FIG. 15 illustrates a schematic diagram of a fan blade in accordance with an embodiment of the present invention compared to full pressure efficiency in the related art;

fig. 16 shows a fifth structural schematic view of a fan blade according to an embodiment of the present invention;

fig. 17 shows six schematic structural views of a fan blade according to an embodiment of the present invention;

fig. 18 shows a seventh structural schematic view of a fan blade according to an embodiment of the present invention;

fig. 19 shows a schematic structural view of a centrifugal fan according to an embodiment of the present invention;

fig. 20 shows a schematic structural view of a centrifugal fan according to another embodiment of the present invention;

fig. 21 shows a schematic structural view of a centrifugal fan according to yet another embodiment of the present invention;

FIG. 22 illustrates a schematic diagram of a fan blade in accordance with an embodiment of the present invention in comparison to a PQ performance of the related art;

fig. 23 shows a schematic diagram of a fan blade in comparison to shaft power in the related art according to an embodiment of the present invention;

fig. 24 shows a schematic diagram of a fan blade in accordance with an embodiment of the present invention compared to full pressure efficiency in the related art.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 24 is:

100 fan blades, 110 pressure side, 120 suction side, 130 depressions, 131 grooves, 132 dimples, 140 first end, 150 second end, 200 centrifugal fan, 210 fan outer edge.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A fan blade 100, a centrifugal fan 200, and a laundry treating apparatus provided according to some embodiments of the present invention are described below with reference to fig. 1 to 24.

The first embodiment is as follows:

as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12, an embodiment of the first aspect of the present invention provides a fan blade 100, where the fan blade 100 includes: a pressure surface 110 and a suction surface 120; and a recess 130 disposed on at least one of the pressure surface 110 and the suction surface 120.

The embodiment of the utility model provides a fan blade 100 includes pressure surface 110, suction surface 120 and depressed part 130, particularly speaking, set up depressed part 130 on at least one in pressure surface 110 and suction surface 120 of fan blade 100, it can be understood, fan blade 100's pressure surface 110 is the fan operation in-process, fan blade 100's windward side, fan blade 100's suction surface 120 is the fan in operation, fan blade 100's leeward side, form the runner of air current between two adjacent fan blade 100, the air current that the fan operation produced flows to the spiral case of fan in through the air current runner, and flow by the air outlet of spiral case. In detail, the pressure surface 110 of the fan blade 100 may be provided with the recess 130, the suction surface 120 of the fan blade 100 may be provided with the recess 130, and of course, both the pressure surface 110 and the suction surface 120 of the fan blade 100 may be provided with the recess 130, which may be specifically set according to actual needs. When the centrifugal fan 200 in the related art works, airflow is easily separated in the airflow channel, and then a vortex is generated in the airflow channel, so that the flow resistance of the airflow in the airflow channel is increased, and the fan flow and efficiency are reduced. By providing the concave portion 130 on at least one of the pressure surface 110 and the suction surface 120 of the fan blade 100, turbulence disturbance of the airflow at the original separation point can be enhanced, so that the airflow separation point is moved backwards, i.e., the airflow is delayed to be separated, the separation area is reduced, the flow resistance of the airflow in the airflow channel is reduced, and the fan efficiency and the fan flow rate are improved.

It can be understood that, during the operation of the fan, the separation degree of the air flow generated by the pressure surface 110 and the suction surface 120 of the fan blade 100 is different, and the flow separation phenomenon generated by the suction surface 120 of the fan is more obvious, so that the suction surface 120 of the fan blade 100 may be provided with the recess 130, so as to form a turbulent flow in the wall-near region of the recess 130, thereby achieving the purpose of reducing the flow resistance of the air flow in the air flow channel.

Example two:

as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, on the basis of the above-described embodiments, further, the recess 130 includes at least one groove 131, and the groove 131 extends in the axial direction of the fan.

In this embodiment, the recess 130 is defined to include at least one groove 131, that is, the specific structure of the recess 130 provided on the fan blade 100 is defined, specifically, the groove 131 extends along the axial direction of the fan, which can effectively enhance turbulence disturbance of the airflow at the original separation point, so as to move the airflow separation point backward, that is, can eliminate or weaken flow separation of the airflow in the airflow channel, thereby reducing flow resistance of the airflow in the airflow channel, and improving fan efficiency and fan flow.

It can be understood that the number of the grooves 131 may be multiple, that is, the plurality of grooves 131 are distributed on at least one of the pressure surface 110 and the suction surface 120 of the fan blade 100, so as to further enhance turbulence disturbance of the airflow, delay the separation point, reduce the separation area, further reduce the flow resistance of the airflow in the airflow channel, and improve the fan efficiency and the fan flow rate. The number of the grooves 131 can be set according to actual needs.

In a specific embodiment, further, the groove 131 extends in the axial direction of the fan and penetrates the fan blade 100.

In this embodiment, it extends and link up fan blade 100 to have injectd recess 131 along the axial direction of fan, and in detail, recess 131 link up the setting along the fan axial, can be in the turbulence disturbance of reinforcing fan blade 100 nearly wall district air current to postpone the air current separation point, promote fan operating efficiency and the basis of the amount of wind, be convenient for fan blade 100 demolding in manufacturing process, and then reduce fan blade 100's the manufacturing difficulty, promote production efficiency, reduce fan blade 100's manufacturing cost.

Example three:

as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12, on the basis of the above-described embodiments, the recess 130 further includes at least one dimple 132.

In this embodiment, the recess 130 is defined to include at least one recess 132, that is, the specific structure of the recess 130 provided on the fan blade 100 is defined, and specifically, by providing at least one recess 132 on at least one of the pressure surface 110 and the suction surface 120 of the fan blade 100, the turbulent disturbance of the airflow at the original separation point can be effectively enhanced, so as to move the airflow separation point backward, that is, the flow separation of the airflow in the airflow channel can be eliminated or weakened, thereby reducing the flow resistance of the airflow in the airflow channel and improving the fan efficiency and the fan flow rate.

It can be understood that the number of the pits 132 may be provided in a plurality, that is, a plurality of the pits 132 are distributed on at least one of the pressure surface 110 and the suction surface 120 of the fan blade 100, so as to further enhance turbulence disturbance of the airflow, delay the separation point, reduce the separation area, further reduce the flow resistance of the airflow in the airflow channel, and improve the fan efficiency and the fan flow rate. The number of the specific pits 132 can be set according to actual needs.

Example four:

as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18 and 19, in addition to the above-described embodiments, the concave portion 130 is provided in the suction surface 120.

In this embodiment, the recess 130 is specifically defined to be disposed on the suction surface 120, it can be understood that, during operation of the fan, the separation degrees of the airflows generated by the pressure surface 110 and the suction surface 120 of the fan blade 100 are different, wherein the flow separation phenomenon generated by the airflows in the airflow channel is generally concentrated on the suction surface 120 of the fan blade 100, and by disposing the recess 130 on the suction surface 120 of the fan blade 100, the turbulent disturbance of the airflows at the original separation point of the suction surface 120 can be effectively enhanced, and the purpose of reducing the airflow flow resistance in the airflow channel is achieved.

Example five:

as shown in fig. 1, fig. 2, fig. 7, fig. 16 and fig. 17, based on any of the above embodiments, further, the fan blade 100 further includes a first end 140, the first end 140 is located at an end of the fan blade 100 close to the fan axis, wherein a circle passing through the first end 140 and concentric with the fan outer edge 210 is set as a first reference circle, and an angle α formed by a tangent plane of the suction surface 120 passing through the first end 140 and a tangent plane of the first reference circle passing through the first end 140 satisfies 0 ° α ≦ 45 °.

In this embodiment, it is defined that the fan blade 100 further includes a first end 140, the first end 140 is an end of the fan blade 100 close to the fan axis, and in detail, an included angle between a tangent plane of the suction surface 120 of the fan blade 100 at the first end 140 and a tangent plane of a first reference circle passing through the first end 140 is an inlet angle of the fan blade 100, that is, an inlet angle of an air flow flowing into the air flow channel during the fan operation. In the related art, airflow flowing in the blade is observed from an absolute coordinate system, and the airflow is considered to flow into an airflow channel of the fan blade along the radial direction, so that the blade inlet design is basically kept in the radial direction for reducing the flow loss, namely, the blade inlet angles are large, so that the impact loss of the airflow on the blade is large when the fan works, the vortex in the airflow channel of the blade is obvious, the flow resistance of the airflow is large, and the efficiency of the fan is reduced. If the coordinate system is viewed on a rotating blade, the airflow enters the airflow path of the fan blade 100 in substantially the circumferential direction of the fan wheel. The inlet angle of fan blade 100 is set based on the air flow direction of motion of impeller coordinate system, be about to the air flow inlet angle of fan blade 100 is injectd between 0 to 45, that is to say, less with the air flow inlet angle of fan blade 100 is injectd, can make the air current gentle excessively at the pressure surface 110 and the suction surface 120 of fan blade 100, thereby can reduce the air current and produce the impact at the flow in-process, and can reduce the emergence of vortex phenomenon, and then can effectively reduce the impact loss and the vortex loss of air current at fan blade 100 entrance, further improve fan efficiency and fan flow.

It can be understood that, if the inlet angle of the fan blade 100 is too large, that is, the inlet of the fan blade 100 is approximately distributed along the radial direction of the fan impeller, so that the airflow may generate a large impact on the pressure surface 110 of the inlet of the fan blade 100 when flowing, causing an impact loss, and reducing the air volume, by designing the inlet angle of the fan blade 100 to be smaller, the airflow may be gentle and excessive on the pressure surface 110 and the suction surface 120 of the fan blade 100, so that the impact generated during the flowing process of the airflow may be reduced, and the occurrence of the vortex phenomenon may be reduced.

Example six:

as shown in fig. 1, fig. 2, fig. 7, fig. 16 and fig. 17, based on the above embodiment, further, the fan blade 100 further includes a second end 150, the second end 150 is located at an end of the fan blade 100 away from the fan axis, wherein a circle passing through the second end 150 and concentric with the fan outer edge 210 is set as a second reference circle, and an angle β formed by a tangent plane of the pressure surface 110 passing through the second end 150 and a tangent plane of the second reference circle passing through the second end 150 satisfies 0 ° β 45 °.

In this embodiment, it is defined that the fan blade 100 further includes a second end 150, and the second end 150 is an end of the fan blade 100 away from the fan axis, in detail, an included angle between a tangent plane of the pressure surface 110 of the fan blade 100 at the second end 150 and a tangent plane of a second reference circle passing through the second end 150 is an outlet angle of the fan blade 100, that is, an outlet angle of the airflow flowing out of the airflow channel during the fan operation. Because the impeller and the blades of the fan are arranged in the volute, airflow generated in the running process of the fan flows in through the inlet of the airflow channel and flows out to the volute through the outlet of the airflow channel, and it can be understood that if the outlet angle of the fan blades 100 is large, the airflow can generate large impact on the inner wall of the volute when flowing out, so that the loss of air volume is caused, namely, the air volume of the fan is reduced. The airflow outlet angle of the fan blade 100 is limited between 0 degree and 45 degrees, namely, the airflow outlet angle of the fan blade 100 is limited to be small, so that airflow can flow along the inner wall of the volute when passing through the outlet of the airflow channel, the impact generated on the inner wall of the volute when the airflow flows out is reduced, the air volume in the running process of the fan is increased, and the efficiency of the fan is improved.

In a specific embodiment, simulation research is performed on a fan in the related art and the fan of the present application, specifically, the two fans both use the same volute and inlet/outlet flow channel, the diameters of fan impellers are the same, and only the blades are optimized, that is, the present application defines the inlet angle and the outlet angle of the blades between 0 ° and 45 °, the inlet of the fan blade 100 in the related art is arranged along the radial direction of the fan impeller, and the performances (air volume and full pressure efficiency) of the two fans are compared, as shown in the following table:

	fan in related art	Fan of this application	Increased amount/%)
				Air volume/CMH	384.6	517.8	34.6
Full pressure efficiency/%)	19.6	22.8	16.3

As is apparent from the table, the amount of wind and the efficiency of the fan can be effectively improved by setting the outlet angle and the inlet angle of the fan blade 100 to be small.

As shown in fig. 22, comparing the PQ performance of the two fans, it can be seen that the PQ curve performance of the fan of the present application is far better than that of the fan in the related art.

As shown in fig. 23, further comparing the shaft power curves of the two fans, it can be seen that at 220CMH flow rate, the shaft power of the two fans is approximately the same, and above 220CMH flow rate, the shaft power of the fan of the present application is significantly higher than that of the fan in the related art.

As shown in fig. 24, further, comparing the full-pressure efficiency curves of the two fans, it can be seen that the efficiency curve of the fan of the present application is superior to the fan in the related art. The maximum efficiency of the fan of this application is 54%, and the maximum efficiency of the fan in the correlation technique is 47%, and the efficiency of the fan of this application can promote 14.9% than the efficiency of the fan in the correlation technique. The high efficiency flow interval of the fan of this application can promote great than the fan in the correlation technique.

Example seven:

according to the utility model discloses a second aspect provides a centrifugal fan 200, include the fan blade 100 that provides like any one of above-mentioned embodiments, therefore possess this fan blade 100's whole beneficial technological effect, no longer describe herein.

As shown in fig. 20 and 21, the centrifugal fan 200 further includes an impeller, a volute, and an air outlet, wherein the plurality of fan blades 100 are disposed on the impeller, the impeller and the plurality of fan blades 100 are disposed in the volute, and the air outlet is communicated with the volute.

In this embodiment, the centrifugal fan 200 is further defined to include an impeller, a volute, and an air outlet, specifically, the plurality of fan blades 100 and the impeller are disposed in the volute, and an air flow generated by the operation of the fan flows out of the volute of the fan through the air flow channel and flows out of the air outlet of the volute.

As shown in fig. 13, 14 and 15, in a specific embodiment, the centrifugal fan 200 includes a forward centrifugal fan 200 and a backward centrifugal fan 200, and CFD simulation analysis is performed on the forward centrifugal fan 200 and the backward centrifugal fan 200, specifically, for the forward centrifugal fan 200, a plurality of grooves 131 are provided on the suction surface 120 of the fan blade 100, and the performance (flow rate, poplar stroke and full pressure efficiency) of the two fans is compared under the condition that the inlet and outlet of the fans are both environmental conditions, as shown in the following table.

	Smooth blade	Groove blade	Increment/%)
				flow/CMH	454	463.3	2.048458
head/Pa	270.5	293.5	8.502773
				Full pressure efficiency/%)	19.5	20	2.564103

As is apparent from the table, the suction surface 120 of the fan blade 100 is provided with the plurality of grooves 131, so that the air volume, the lift stroke and the efficiency of the fan can be effectively improved.

For backward centrifugal fan 200, a plurality of concave pits 132 are provided on pressure surface 110 of fan blade 100, and the performance (flow rate) of both fans is compared under the condition that both the inlet and outlet of the fan are environmental conditions, as shown in the following table.

	Smooth blade	Pit blade	Increment/%)
				flow/CMH	145.6	146	0.274725

As can be seen from the table, the phenomenon of flow separation of the air flow is not very obvious when the backward centrifugal fan 200 is in operation, and therefore, the air volume of the fan is only slightly increased. Therefore, the effect of delaying the separation of the air flow is more remarkable by providing the recess 130 on the blade of the forward centrifugal fan 200.

Example eight:

according to the utility model discloses a third aspect provides a clothes treatment device, include the centrifugal fan 200 that provides like above-mentioned any embodiment, therefore possess this centrifugal fan 200's whole beneficial technological effect, no longer describe herein.

In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan blade, comprising:

a pressure surface (110) and a suction surface (120);

a recess (130) disposed on at least one of the pressure surface (110) and the suction surface (120).

2. The fan blade of claim 1,

the recess (130) comprises at least one groove (131), the groove (131) extending in an axial direction of the fan.

3. The fan blade of claim 2,

the groove (131) extends along the axial direction of the fan and penetrates through the fan blade.

4. The fan blade of claim 1,

the recess (130) comprises at least one dimple (132).

5. The fan blade according to any of claims 1 to 4,

the recess (130) is provided in the suction surface (120).

6. The fan blade according to any of claims 1 to 4, further comprising:

a first end (140) located at one end of the fan blade near the fan axis;

wherein, a circle which passes through the first end (140) and is concentric with the outer edge of the fan is set as a first reference circle, and the angle alpha formed by the tangent plane of the suction surface (120) passing through the first end (140) and the tangent plane of the first reference circle which passes through the first end (140) satisfies the condition that the angle alpha is more than or equal to 0 degree and less than or equal to 45 degrees.

7. The fan blade according to any of claims 1 to 4, further comprising:

a second end (150) located at an end of the fan blade away from the fan axis;

wherein, a circle which passes through the second end (150) and is concentric with the outer edge of the fan is set as a second reference circle, and an angle beta formed by a tangent plane of the pressure surface (110) passing through the second end (150) and a tangent plane of the second reference circle which passes through the second end (150) satisfies 0 degrees to beta degrees and 45 degrees.

8. A centrifugal fan comprising a plurality of fan blades according to any of claims 1 to 7.

9. The centrifugal fan of claim 8, further comprising:

an impeller to which a plurality of the fan blades are provided;

a volute within which the impeller and the plurality of fan blades are disposed;

and the air outlet is communicated with the volute.

10. A laundry treatment apparatus, characterized in that it comprises a centrifugal fan according to claim 8 or 9.