CN212774920U - Blade, impeller and fan - Google Patents

Abstract

The utility model discloses a blade, impeller and fan belongs to axial fan technical field. The blade comprises a blade main body, wherein a wavy part is arranged at the front edge of the blade main body, the molded lines of the wavy part are distributed according to a sine curve, a noise reduction groove is formed in the wave trough of the wavy part, and the central line of the noise reduction groove coincides with the normal line of the wave trough. The impeller comprises a hub and a plurality of blades, and the plurality of blades are uniformly connected to the circumferential side surface of the hub. The fan comprises a motor and the impeller, and the output end of the motor is connected with the hub of the impeller. The utility model provides a blade, impeller and fan can reduce the pressure pulsation on blade surface at the during operation, and the vortex that hinders the pressure surface to the suction surface flows to improve the inside mobile condition of impeller, and then reduce the noise of impeller and fan work.

Description

Blade, impeller and fan

Technical Field

The utility model relates to an axial fan technical field especially relates to a blade, impeller and fan.

Background

An axial flow fan is a power device which converts mechanical energy into fluid potential energy and kinetic energy. Axial fans are commonly used for ventilation in factories, warehouses, offices, houses, and the like, and also for air coolers (air coolers), evaporators, condensers, and the like. With the increasing industrial demands and the requirements of people on the quality of life, the noise reduction demand of the axial flow fan is increasing.

The impeller of the axial flow fan mainly comprises blades and a hub, the structure and the selection of the blades determine the overall performance of the fan, and the wind pressure, the noise reduction, the efficiency and the like of the fan are influenced. The prior axial flow fan impeller mainly adopts airfoil type blades and non-airfoil type blades to meet different requirements, and when the impeller rotates, gas axially enters the impeller from an air inlet of the axial flow fan and is pushed by the blades on the impeller to move the air. When the airflow passes through the blade and reaches the leading edge of the blade, the mass of the airflow may shed forming shed vortices at the leading edge of the blade, thereby generating vortex noise. Because traditional axial fan noise is great, when the requirement to the noise is higher, the designer often can reduce other parameters, such as rotational speed, blade quantity etc. has restricted axial fan's application range greatly.

Therefore, there is a need for a blade, an impeller and a fan capable of reducing noise to solve the above technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a blade, impeller and fan, the pressure pulsation on the surface of this blade is little, has reduced the vortex flow that the pressure surface reaches the suction surface to improve the inside mobile condition of impeller, and then reduced the noise of impeller and fan in the work.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a blade, includes the blade main part, the leading edge of blade main part is provided with wave portion, the molded lines of wave portion accords with sinusoidal distribution, the trough of wave portion is provided with and falls the groove of making an uproar, fall the central line in groove of making an uproar with the normal line of trough coincides mutually.

As a preferable technical scheme of the blade, the shape of the noise reduction groove is V-shaped.

As a preferred technical scheme of the blade, the amplitude of the sinusoidal curve is 5mm, and the wavelength of the sinusoidal curve is 21.875 mm.

As a preferred technical scheme of the blade, the groove width and the groove depth of the noise reduction groove are both 1 mm.

In order to achieve the above object, the present invention also provides an impeller, which comprises a hub and a plurality of blades as described above, and a plurality of blades evenly connected to the circumferential side surface of the hub.

As a preferred technical scheme of the impeller, the number of the blades is 2, 4, 6, 8, 10 or 12.

As a preferred technical scheme of the impeller, a motor mounting hole is formed in the hub.

In order to achieve the above object, the present invention further provides a fan, including a motor and an impeller as described above, wherein the output end of the motor is connected to the impeller.

The utility model provides a blade, an impeller and a fan, wherein, the fan comprises an impeller and a motor, the impeller comprises a blade and a hub, the blade is provided with a wave part with a molded line which is distributed according to a sine curve at the front edge of a blade main body, the pneumatic performance of the blade is improved, and the pneumatic noise of the blade is reduced; the wave trough of the wave part is provided with the noise reduction groove, the center line of the noise reduction groove coincides with the normal line of the wave trough, the pressure pulsation of the wave trough is weakened, the pressure pulsation of the surface of the blade is reduced, the vortex flow from the pressure surface to the suction surface is blocked, the condition that the impeller flows inside is improved, and the working noise of the impeller and the fan is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an impeller according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a blade according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of a blade according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a noise reduction groove according to an embodiment of the present invention.

Reference numerals:

1. a blade main body; 2. a wave portion; 3. a noise reduction groove;

100. a hub; 200. a blade.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the present embodiment provides a fan, which includes a motor and an impeller, specifically, the impeller includes a hub 100 and a plurality of blades 200, the plurality of blades 200 are uniformly connected to a circumferential side surface of the hub 100, and an output end of the motor is connected to the hub 100 of the impeller. Further, a motor mounting hole is formed in the hub 100 for connecting with a motor. Specifically, the output end of the motor is connected to the motor mounting hole of the hub 100 through a fixing member. When the fan and the impeller work, the pressure pulsation on the surface of the blade 200 can be reduced, and the vortex flow from the pressure surface to the suction surface is blocked, so that the condition of the flow in the impeller is improved, and the working noise of the fan is reduced.

Alternatively, the number of blades 200 is typically 2, 4, 6, 8, 10, 12, etc., and the specific number may be determined by the specific design. Preferably, in the present embodiment, the number of the blades 200 is 8.

As shown in fig. 2 to 4, the blade 200 includes a blade body 1, a wavy portion 2 is provided at a leading edge of the blade body 1, a profile of the wavy portion 2 conforms to a sinusoidal distribution, a noise reduction groove 3 is provided at a trough of the wavy portion 2, and a center line of the noise reduction groove 3 coincides with a normal line of the trough.

The surfaces on the two sides of the front edge of the blade main body 1 are a pressure surface and a suction surface respectively, wherein the pressure surface refers to a surface where pressure is increased and the blade 200 presses fluid; the suction side refers to the side of the blade 200 that the fluid impacts due to the pressure reduction. The profile of the blade body 1 in this embodiment at the leading edge conforms to the wavy portion 2 distributed in a sinusoidal curve, so that the aerodynamic performance of the blade 200 can be improved, and the aerodynamic noise of the blade 200 can be reduced. The trough department of wave portion 2 is provided with and falls groove 3 of making an uproar, because the air current that converges of trough both sides is symmetrical, therefore, the central line that the design was fallen groove 3 of making an uproar coincides with the normal line of trough, in order to weaken the pressure pulsation of trough department, and then reduce the pressure pulsation on blade 200 surface, the vortex flow of pressure surface to suction surface has been hindered, when making blade 200 be applied to in impeller and the fan, can improve the condition that the inside air current of impeller flows, and then reduce the noise of impeller and fan work, and can not influence the pressure boost effect when reducing the vortex almost, compare in prior art, avoid adopting the mode that reduces rotational speed or blade quantity isoparametric in order to reduce the noise, axial fan's application range has been enlarged. The blade 200 that this embodiment provided simple structure, the processing degree of difficulty reduces, is fit for bulk production.

Alternatively, as shown in fig. 3 and 4, the noise reduction groove 3 is V-shaped. The V-shaped noise reduction groove 3 processed at the trough of the wave part 2 can ensure that the aerodynamic performance of the blade 200 is not damaged, the airflow continuously converged into the V-shaped noise reduction groove 3 accelerates the airflow velocity at the trough of the blade 200, and ensures the sufficient pressure difference between the pressure surface and the suction surface of the blade 200, and the V-shaped noise reduction groove 3 interferes with the pressure pulsation generated by the V-shaped noise reduction groove 3 to further weaken the pressure pulsation at the trough.

Preferably, in this embodiment, the amplitude of the sinusoid is 5mm, the wavelength of the sinusoid is 21.875mm, and the groove width and the groove depth of the noise reduction groove 3 are both 1mm, where it should be noted that the groove width refers to the B dimension shown in fig. 4, and the groove depth refers to the a dimension shown in fig. 4. At the crest, the air current constantly gathers to the trough along the curve edge, and the effective chord length of trough department shortens simultaneously for the velocity of flow that can accelerate the air current in leading edge department, the increase of velocity of flow then makes pressure surface and suction surface pressure differential increase. Secondly, the sinusoidal curve is continuously changed, and the airflow sudden change cannot be caused. In the technical field of axial flow fans, the ratio of the amplitude to the chord length and the ratio of the wavelength to the chord length are generally dimensionless, and when the ratio of the amplitude to the chord length and the ratio of the wavelength to the chord length are different, the aerodynamic performance of the blade 200 is changed correspondingly.

It should be noted that, when the V-shaped noise reduction grooves 3 are disposed at the wave troughs of the wavy sinusoidal curve, the size of the V-shaped noise reduction grooves 3 is mainly affected by the amplitude and wavelength of the sinusoidal curve, and should not be too large, otherwise the aerodynamic performance of the blade 200 is seriously damaged, and the groove height/sinusoidal amplitude and the groove width/sinusoidal wavelength are generally dimensionless for facilitating the theoretical analysis by those skilled in the art. Those skilled in the art can set different sizes of noise reduction slots 3 to meet different requirements according to the sinusoids with different amplitudes and wavelengths.

Preferably, in the present embodiment, the shape of the blade body 1 is a bionic wing shape, which can further improve the aerodynamic performance of the blade 200. In other embodiments, other shapes of blades may be used.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (8)

1. The utility model provides a blade, includes blade main part (1), its characterized in that, the leading edge of blade main part (1) is provided with wave portion (2), the molded lines of wave portion (2) accord with sinusoidal distribution, the trough of wave portion (2) is provided with and falls groove (3) of making an uproar, fall the central line of groove (3) with the normal line of trough coincides mutually.

2. A blade according to claim 1, characterized in that the shape of the noise reduction groove (3) is V-shaped.

3. The blade of claim 1 wherein said sinusoid has an amplitude of 5mm and a wavelength of 21.875 mm.

4. A blade according to claim 3, characterized in that the groove width and the groove depth of the noise reducing groove (3) are both 1 mm.

5. Impeller, characterized in that it comprises a hub (100) and a plurality of blades (200) according to any one of claims 1 to 4, said plurality of blades (200) being uniformly connected to the circumferential side of said hub (100).

6. The impeller as recited in claim 5, characterized in that the number of blades (200) is 2, 4, 6, 8, 10 or 12.

7. The impeller as recited in claim 5, characterized in that the hub (100) is provided with motor mounting holes.

8. A fan, characterized in that it comprises an electric motor and an impeller according to any one of claims 5 to 7, the output of said electric motor being connected to said hub (100) of said impeller.

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