CN211573698U

CN211573698U - Noise reduction device and blade

Info

Publication number: CN211573698U
Application number: CN201921595464.6U
Authority: CN
Inventors: 李成良; 任旺; 丁惢
Original assignee: Sinomatech Wind Power Blade Co Ltd
Current assignee: Sinomatech Wind Power Blade Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-09-25
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a device and blade of making an uproar falls, fall the device of making an uproar and be used for the blade, fall the device of making an uproar and include: the body comprises a mounting part, and the body can be connected with the blade through the mounting part; sawtooth unit, with this body coupling, the edge of sawtooth unit has the sawtooth structure, is between sawtooth unit and the body and predetermines angle alpha setting, predetermines angle alpha and satisfies: alpha is more than or equal to 1 degree and less than or equal to 5 degrees. The utility model provides a device and blade of making an uproar falls can reduce the blade and at the aerodynamic noise that the operation in-process produced, improves the stability of blade operation.

Description

Noise reduction device and blade

Technical Field

The utility model relates to a wind-powered electricity generation technical field especially relates to a device and blade of making an uproar fall.

Background

With the continuous development of wind power technology, wind driven generators tend to be large-sized, and the distance between the wind driven generators and residential areas is closer and closer. However, the wind driven generator generates aerodynamic noise during operation, the aerodynamic noise can seriously affect the lives of surrounding residents to cause environmental pollution, and the noise can cause fatigue and damage to the structure of the wind driven generator.

At present, the noise reducer is mainly installed on a blade to reduce aerodynamic noise generated by the blade, but the wind speed and the wind force applied to a wind driven generator in the operation process are changed frequently, and the conventional noise reducer cannot well reduce the aerodynamic noise generated by the wind driven generator due to unreasonable structural arrangement.

Accordingly, it is desirable to provide a new noise reducer and blade.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a device and blade of making an uproar falls aims at reducing the aerodynamic noise that the blade operation in-process produced, improves the stability of blade operation.

On the one hand, the embodiment of the utility model provides a device of making an uproar falls for the blade, the device of making an uproar falls includes: the body comprises a mounting part, and the body can be connected with the blade through the mounting part; sawtooth unit, with this body coupling, the edge of sawtooth unit has the sawtooth structure, is between sawtooth unit and the body and predetermines angle alpha setting, predetermines angle alpha and satisfies: alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

According to an aspect of the embodiments of the present invention, the preset angle α is 3 °.

According to an aspect of the embodiment of the present invention, the edge of the saw tooth unit has a plurality of saw tooth structures, and the plurality of saw tooth structures are arranged in a shrinking manner in a direction away from the body; optionally, the sawtooth structure is triangular.

According to an aspect of the embodiments of the present invention, the sawtooth unit includes a base and two intersecting reference sides, and the extension lines of the two reference sides and the base form a virtual triangle together; the sawtooth unit includes a plurality of noise reduction portions of interconnect, and a plurality of noise reduction portions all arrange in virtual triangle-shaped, and noise reduction portion is polygonized structure, and a plurality of noise reduction portions set gradually along the direction that deviates from the body, and the edge interconnect of a plurality of noise reduction portions forms a plurality of sawtooth structures.

According to an aspect of the embodiment of the present invention, two adjacent noise reduction parts are disposed in a mutually inclined manner; optionally, the number of the noise reducing parts is equal to or greater than three.

According to the utility model discloses an aspect, the portion of making an uproar falls includes interconnect's connecting portion and sawtooth portion, and sawtooth portion forms the sawtooth structure, and the setting of inclining each other between connecting portion and the sawtooth portion, inclination between connecting portion and the sawtooth portion are 1 ~ 3.

According to an aspect of an embodiment of the present invention, the noise reducer may be mounted to the blade, the blade having a first chord length corresponding to the saw tooth unit along a height direction of the saw tooth unit, the saw tooth unit including a base side and a vertex deviating from the base side, a distance between the base side and the vertex being a height of the saw tooth unit; wherein, the height of the sawtooth unit is 15 to 20 percent times of the corresponding first chord length.

According to an aspect of the embodiment of the present invention, the length of the bottom side of the saw tooth unit is the width of the saw tooth unit, and the height of the saw tooth unit is 3 times the width of the saw tooth unit.

According to an aspect of the embodiment of the present invention, the body is integrally formed with the saw tooth unit.

On the other hand, the embodiment of the utility model provides a blade, include: a housing including a trailing edge; noise reducing devices, such as those described above, are provided on the trailing edge of the housing.

The embodiment of the utility model provides a device and blade of making an uproar falls, the device of making an uproar falls includes body and sawtooth unit, and the body passes through the installation department can be stably connected with the blade, and sawtooth unit and this body coupling, the edge of sawtooth unit have the sawtooth structure for the torrent on blade surface of flowing through forms a plurality of reverse eddies to and offset each other. When the noise reduction device is applied to the blade, the sawtooth structure can change the turbulent flow condition on the surface of the blade, break up the vortex pair on the surface of the blade, reduce the energy of the vortex pair, so as to reduce the pulsating pressure generated when the vortex pair acts on the surface of the blade, and further reduce the noise generated in the operation process of the blade. Further, the body of the noise reduction device and the sawtooth unit are in preset angle setting, and on the premise that the body is stably connected with the tail edge of the blade, the sawtooth unit can better damage the blade to generate eddy currents on the surface of the blade in the rotating process, so that the noise reduction effect is improved.

Drawings

In the following, the drawings required to be used in the embodiments of the present invention will be briefly described, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present invention;

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

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a cross-sectional view taken in the direction B-B of FIG. 2;

fig. 5 is a schematic structural diagram of a noise reduction device according to an embodiment of the present invention;

fig. 6 is a side view of a noise reducer according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a saw tooth unit according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a saw tooth unit according to another embodiment of the present invention

Fig. 9 is a schematic structural view of a saw tooth unit according to another embodiment of the present invention;

fig. 10 is a side view of a saw tooth unit according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view taken at C-C of FIG. 9;

FIG. 12 is a graph showing experimental results of different noise reducers installed in test models, in which the ratio of the height of the saw tooth units to the width of the saw tooth units in the plurality of noise reducers is the same, and the angles between the body and the saw tooth units are different;

FIG. 13 is a graph of experimental results of different noise reducers installed on a test model, wherein the angles between the body and the saw tooth units are the same, and the ratio of the height of the saw tooth units to the width of the saw tooth units in the plurality of noise reducers is different;

fig. 14 is an experimental result diagram of a test model in which a noise reduction device according to an embodiment of the present invention and a noise reduction device according to another embodiment of the present invention are separately installed;

fig. 15 is a schematic flow chart of a blade forming method according to an embodiment of the present invention.

Description of the labeling:

wherein:

1-an impeller; 100-blade; 200-a hub; x-axial direction; y-chord direction;

10-a housing; 11-windward side shell; 12-leeward side shell; 13-a leading edge region; 14-the trailing edge region; 15-leaf root; 16-tip part; 17-a hollow space;

20-a web;

30-noise reducing means; 31-a body; 311-a mounting part; 312 — a first surface; 32-a saw tooth unit; 321-a second surface; 322-a saw tooth structure; 323-a first noise reducing portion; 3231-connecting part; 3232-serration; h-height; w-width; 33-bottom edge; 34-a reference edge; 324-a second noise reduction portion; 325-a third noise reduction portion;

2-a generator;

3-a cabin;

and 4, tower barrel.

Detailed Description

The features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention, for the purposes of illustrating the principles of the invention. Additionally, the components in the drawings are not necessarily to scale. For example, the dimensions of some of the structures or regions in the figures may be exaggerated relative to other structures or regions to help improve understanding of embodiments of the present invention.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise stated, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

Furthermore, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure or component comprising a list of elements does not include only those elements but may include other mechanical components not expressly listed or inherent to such structure or component. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

For better understanding of the present invention, the noise reducer 30, the blade 100 and the blade forming method according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 15.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a wind turbine generator set in the prior art. The wind generating set mainly comprises a tower 4, a nacelle 3, a generator 2 and an impeller 1, wherein the nacelle 3 is arranged at the top end of the tower 4, and the generator 2 is arranged in the nacelle 3, and may be located inside the nacelle 3, or of course, may be located outside the nacelle 3. The impeller 1 includes a hub 200 and more than two blades 100 respectively connected to the hub 200, and the blades 100 drive the hub 200 to rotate under the action of wind load, thereby realizing power generation of the generator 2.

In order to enable the wind generating set to operate better, the embodiment of the present invention provides a novel blade 100, please refer to fig. 2 and fig. 4 together, fig. 2 shows an overall schematic view of the blade according to the embodiment of the present invention, fig. 3 shows an enlarged view of a position a in fig. 2, and fig. 4 shows a cross-sectional view of a direction B-B in fig. 2.

The embodiment of the utility model provides a blade 100 includes shell 10, web 20 and noise reduction device 30, and shell 10 has axial X and chord direction Y, and shell 10 is including relative windward side casing 11 and leeward side casing 12 that set up, and windward side casing 11 and leeward side casing 12 lock form hollow space 17, and shell 10 has leading edge district 13 and trailing edge district 14 on its chord direction Y, has blade root portion 15 and tip portion 16 at axial X. The web 20 is disposed in the hollow space 17, the web 20 is connected to the windward shell 11 and the leeward shell 12, and the web 20 can support the outer shell 10 of the blade 100 to enhance the strength of the blade 100. The blade 100 is provided with a noise reducer 30 at a side facing away from the hollow space 17 for reducing noise generated when the blade 100 is in operation.

In some embodiments, when the airflow blows towards the blade 100, the airflow interacts with the blade 100 to form a turbulent flow flowing along the surface of the blade 100, and since the turbulent flow on the surface of the blade 100 may flap the blade 100 during the operation of the blade 100, a large aerodynamic noise may be generated, and by providing the noise reduction device 30 on the surface of the blade 100, the aerodynamic noise generated during the operation of the blade 100 may be effectively reduced, and at the same time, the stability of the operation of the blade 100 may be improved.

In some embodiments, blade 100 includes a trailing edge disposed proximate tip portion 16 of blade 100, and when airflow is blown against blade 100, the airflow interacts with blade 100 to create turbulence along the surface of blade 100, where sound scattering occurs, creating noise, and the greater the intensity of the turbulence, the greater the noise. To effectively reduce the aerodynamic noise of the blade 100 during operation, the noise reducer 30 is disposed on the trailing edge to effectively reduce the noise on the surface of the trailing edge while improving the stability of the blade 100.

In order to better reduce the aerodynamic noise generated during the operation of the blade 100, the embodiment of the present invention provides a novel noise reduction device 30. Please refer to fig. 5 to 11 together, fig. 5 shows a schematic structural diagram of a noise reducer according to an embodiment of the present invention, fig. 6 shows a side view of the noise reducer according to an embodiment of the present invention, fig. 7 shows a schematic structural diagram of a saw tooth unit according to an embodiment of the present invention, fig. 8 shows a schematic structural diagram of a saw tooth unit according to another embodiment of the present invention, fig. 9 shows a schematic structural diagram of a saw tooth unit according to yet another embodiment of the present invention, fig. 10 shows a side view of the saw tooth unit according to an embodiment of the present invention, and fig. 11 shows a cross-sectional view of C-C in fig. 9.

An embodiment of the present invention provides a noise reducer 30 for a blade 100. The noise reducer 30 includes a body 31 and a saw-tooth unit 32. The body 31 includes a mounting portion 311, and the body 31 can be connected to the blade 100 through the mounting portion 311. Sawtooth unit 32 is connected with body 31, and the edge of sawtooth unit 32 has sawtooth structure 322, is between sawtooth unit 32 and the body 31 and predetermines angle alpha setting, predetermines angle alpha and satisfies: alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

The embodiment of the utility model provides a noise reduction device 30 includes body 31 and sawtooth unit 32, and body 31 can carry out stable connection with blade 100 through installation department 311, and sawtooth unit 32 is connected with body 31, and the edge of sawtooth unit 32 has sawtooth structure 322 for the torrent on blade 100 surface of flowing through forms a plurality of reverse vortex pairs and offsets each other. When the noise reducer 30 is applied to the blade 100, the sawtooth units 32 can change the turbulent flow condition on the surface of the blade 100, break up the vortex pairs on the surface of the blade 100, and reduce the energy of the vortex pairs, so as to reduce the pulsating pressure generated when the vortex pairs act on the surface of the blade 100, and further reduce the noise generated during the operation of the blade 100.

Further, the body 31 and the sawtooth unit 32 of the noise reduction device 30 are arranged at a preset angle α, and on the premise that the body 31 and the blade 100 are stably connected, the sawtooth unit 32 can better damage the blade 100 to generate turbulence on the surface of the blade 100 in the rotating process, so that the noise reduction effect is improved.

In some alternative embodiments, the body 31 comprises a first surface 312 opposite to the mounting portion 311, the saw tooth unit 32 comprises a second surface 321, and the preset angle α between the saw tooth unit 32 and the body 31 is the angle between the first surface 312 and the second surface 321, along the thickness direction of the body 31 itself. In some embodiments, the preset angle α is 3 °. Experiments show that the noise reduction effect of the blade 100 can be effectively improved by setting the preset angle to 3 degrees. Through the distance between the first surface 312 and the second surface 321 which are reasonably arranged, the saw tooth unit 32 can better break up the vortex on the surface of the blade 100, so that the aerodynamic noise generated in the operation process of the blade 100 is effectively reduced. Optionally, to enhance the stability of the blade 100 connecting to the noise reducer 30, the shape of the mounting portion 311 matches the shape of the surface of the blade 100 to increase the connecting area of the mounting portion 311 and the blade 100.

Referring to fig. 7, in some embodiments, the saw unit 32 is triangular, and the structure of the saw unit 32 and the predetermined angle between the saw unit 32 and the body 31 are reasonably set to effectively reduce noise.

In some alternative implementations, the noise reducer 30 includes a plurality of sawtooth units 32 to break up turbulence at the surface of the blade 100. Referring to fig. 8 to 11, at least a portion of the saw tooth units 32 has a plurality of saw tooth structures 322 on the edge thereof, and the plurality of saw tooth structures 322 are arranged in a shrinking manner in a direction away from the body 31. Arrange in the direction shrink that deviates from body 31 through making a plurality of sawtooth structures 322, make the whole profile of sawtooth unit 32 be similar to triangle-shaped or trapezoidal, break up the torrent on blade 100 surface better, form less vortex, and simultaneously, edge through with sawtooth unit 32 sets up a plurality of sawtooth structures 322, every sawtooth structure 322 can also further break up less vortex, thereby make the energy of the vortex after a plurality of sawtooth structures 322 break up show and reduce, slap the aerodynamic noise that blade 100 surface produced with better reduction vortex.

Optionally, the sawtooth structures 322 are triangular. Triangular sawtooth structure 322 has stress concentration portion for sawtooth structure 322 can be fast and the effectual torrent of breaing up, makes the distance that the vortex that the torrent formed is right near, and the offset effect each other is strong, is favorable to improving noise reduction, and then reduces the aerodynamic noise that blade 100 produced at the operation in-process. Of course, it is understood that the sawtooth structures 322 may also be one or a combination of trapezoidal structures, polygonal line structures, and circular arc structures.

In some optional embodiments, the sawtooth unit 32 includes a base 33 and two intersecting reference sides 34, an extension line of the two reference sides 34 and the base 33 form a virtual triangle together, the sawtooth unit 32 includes a plurality of noise reduction portions 323 connected to each other, the plurality of noise reduction portions 323 are all arranged in the virtual triangle, the noise reduction portions 323 are polygonal structures, the plurality of noise reduction portions 323 are sequentially arranged in a direction away from the body 31, and edges of the plurality of noise reduction portions 323 are connected to each other to form a plurality of sawtooth structures 322.

Alternatively, the width of the plurality of noise reducing portions 323 decreases in a direction away from the body 31. The noise reduction parts include a first noise reduction part 323, the first noise reduction part is arranged close to the body 31, the side of the first noise reduction part 323 close to the body 31 is the base side 33 of the saw tooth unit 32, two sides of the first noise reduction part 323 intersecting the base side 33 are overlapped with the reference sides 34 of the saw tooth unit 32, and at this time, the extension lines of the two reference sides 34 and the base side 33 form a virtual triangle together.

In a specific implementation, the triangular saw tooth unit 32 may be manufactured first, and then the edge of the triangular saw tooth unit 32 is further processed, so that the edge of the saw tooth unit 32 forms a plurality of saw tooth structures 322, and at this time, the plurality of saw tooth structures 322 are all disposed in the saw tooth unit 32. When blade 100 is at the operation in-process, because sawtooth unit 32 is triangle-shaped for sawtooth unit 32 can be broken up great energy's torrent tentatively, then further breaks up through the vortex pair after individual sawtooth structure 322 will tentatively break up on the sawtooth unit 32 edge, with the effectual aerodynamic noise that produces on the reduction blade 100 surface.

Optionally, the number of the noise reduction portions is greater than or equal to three, specifically, please refer to fig. 10, the noise reduction portions include a first noise reduction portion 323, a second noise reduction portion 324 and a third noise reduction portion 325, the noise reduction portions can better weaken the energy of turbulence on the surface of the blade 100, and meanwhile, by reasonably setting the number of the noise reduction portions, the number of the sawtooth structures 322 formed at the edges of the noise reduction portions is larger, the number of the reverse vortex pairs formed after the turbulence is broken up is larger, the energy of the turbulence is reduced due to the increase of the number of the vortex pairs, and the noise reduction effect is improved.

In order to more effectively break up the turbulence on the surface of the blade 100 in all directions to reduce the aerodynamic noise generated on the surface of the blade 100, two adjacent noise reducing portions are arranged obliquely to each other. In a specific embodiment, the first noise reduction part 323, the second noise reduction part 324, and the third noise reduction part 325 may be disposed to be inclined to each other. The first noise reduction part 323, the second noise reduction part 324 and the third noise reduction part 325 have similar structures, and the embodiment of the present invention is described by taking the first noise reduction part 323 as an example.

In some alternative embodiments, the first noise reduction part includes a connection part 3231 and a saw tooth part 3232 connected to each other, and the saw tooth part 3232 forms a saw tooth structure 322, as shown in fig. 11, the connection part 3231 and the saw tooth part 3232 are arranged obliquely to each other, and the inclination angle between the connection part 3231 and the saw tooth part 3232 is 1 ° to 3 °. Because the wind speed that blade 100 received in the operation and the power of wind often change, through the structure of the reasonable noise reduction portion that sets up for sawtooth structure 322 can be broken up the torrent in a plurality of directions, in order to improve noise reduction.

Further, the first noise reduction part 323 includes two saw tooth portions 3232 and a connecting portion 3231 disposed between the two saw tooth portions 3232 and connecting the two saw tooth portions 3232, wherein the two saw tooth portions 3232 on the same noise reduction part may have the same or different shapes. Of course, the shape of the saw tooth portion 3232 between different noise reduction portions may also be set according to the user's needs. For example, the serrations 3232 of the first noise reduction portion 323 may form a triangular serration structure, and the serrations 3232 of the second noise reduction portion 324 may form a rectangular serration structure.

In some alternative embodiments, the noise reducer 30 can be mounted to the blade 100, the blade 100 having a first chord length corresponding to the saw tooth unit 32 along a height direction of the saw tooth unit 32, the saw tooth unit 32 including a base side 33 and an apex facing away from the base side 33, a distance between the base side 33 and the apex being a height H of the saw tooth unit 32, wherein the height H of the saw tooth unit 32 is 15% to 20% times the corresponding first chord length. Alternatively, the length of the bottom side 33 of the saw tooth unit 32 is the width W of the saw tooth unit 32, and the height H of the saw tooth unit 32 is 3 times the width W of the saw tooth unit 32. By properly setting the relationship between the height H of the saw tooth unit 32 and the corresponding first chord length, the height of the saw tooth unit 32 changes with the first chord length of the blade 100 when the first chord length of the blade 100 changes in the axial direction X of the blade 100, and further, because the height H of the saw tooth unit 32 and the width W have the corresponding relationship, the width W of the saw tooth unit 32 also changes with the first chord length when the first chord length of the blade 100 changes, so that the saw tooth unit 31 can more effectively reduce the noise generated by the blade 100.

In order to improve the stability of the noise reducer 30 and to perform noise reduction better, the body 31 of the noise reducer 30 and the saw tooth unit 32 are integrally formed, and the noise reducer 30 is made of resin mixed with chopped glass fibers.

In order to accurately and comprehensively test the noise characteristics of the noise reducer 30 and the blade 100, in some embodiments, the noise characteristics of the blade 100 provided with the noise reducer 30 are tested by using a microphone array method and a wind tunnel experiment. Wherein, microphone array method test noise and wind-tunnel experiment should understand for the ordinary technical personnel in this field to have, and the no longer gives details here, should not regard as the restriction of the utility model discloses.

In the noise characteristic test, a test model is first created based on the shape parameters of the tip portion 16 of the blade 100, and for example, the test model may be created in an equal proportion to the size of the trailing edge of the actual blade 100. The test patterns are then placed on a test apparatus for experimentation, it being understood that the test apparatus is capable of rotating the test patterns to simulate rotation and yaw of the blade 100 in operation. The embodiment of the utility model provides an in, choose for use to carry out the experiment around the noise reduction effect of test section 55 ~ 115 microphone array to the noise reduction device, for example in the noise characteristic test experiment, set up the microphone array respectively at test model's 50, 60, 70, 80, 90 and 100 positions with the noise of gathering test model production in the operation.

Referring to fig. 12 to 14, fig. 12 is a graph showing experimental results of different noise reducers installed on a test model, in which the ratio of the height of the saw tooth units to the width of the saw tooth units in the noise reducers is the same, and the angles between the main body and the saw tooth units are different. Fig. 13 is a graph showing experimental results of different noise reducers installed in test models, in which the angles between the body and the saw tooth units are the same, and the ratio of the height of the saw tooth units to the width of the saw tooth units in the plurality of noise reducers is different. Fig. 14 shows that the test model is respectively installed the noise reduction device of an embodiment of the present invention and the experimental result diagram of the noise reduction device of another embodiment of the present invention.

It should be noted that, the reference line in fig. 12 is a noise test result of the test model during the operation process when the noise reducer 30 according to the embodiment of the present invention is not installed in the test model. Referring to fig. 12, L1, L2 and L3 are noise results measured by a microphone array when different noise reducers 30 are installed in the test model, respectively.

Specifically, in L1, the angle between the body 31 of the noise reducer 30 mounted by the test pattern and the saw tooth unit 32 is 1 degree, and the ratio between the height H of the saw tooth unit 32 and the width W of the saw tooth unit 32 is 1, that is, H/W is 1. In L2, the angle between the body 31 of the test pattern-mounted noise reducer 30 and the serration unit 32 is 3 degrees, and the ratio between the height H of the serration unit 32 and the width W of the serration unit 32 is 1, i.e., H/W is 1. In L3, the angle between the body 31 of the test pattern-mounted noise reducer 30 and the serration unit 32 is 5 degrees, and the ratio between the height H of the serration unit 32 and the width W of the serration unit 32 is 1, i.e., H/W is 1.

As can be seen from fig. 12, L1 represents a noise result that is about 1dBA lower than the baseline, L2 represents a noise result that is about 3dBA lower than the baseline, and L3 represents a noise result that is about 2dBA lower than the baseline. Compare in the datum line, the noise result that L1, L2 and L3 represented all is less than the noise reduction effect that the datum line represented, consequently, has installed when the test model the utility model discloses when noise reduction device 30 of embodiment, the noise that is provided with noise reduction device 30's test model was surveyed to the microphone array method is showing and is reducing. It is true to verify the utility model discloses the noise that falls device 30 of making an uproar can show and reduce test model and produce at the operation in-process, through installing on test model the utility model discloses the noise that falls device 30 of making an uproar can reduce about 1dBA ~ 3 dBA's noise.

Referring to fig. 13, L4, L5 and L6 respectively show the noise results measured by the microphone array when different noise reduction devices 30 are installed on the test model. Specifically, in L4, the ratio between the height H of the saw tooth unit 32 and the width W of the saw tooth unit 32 is 5, that is, H/W is 5, and the angle between the body 31 of the test pattern mounted noise reducer 30 and the saw tooth unit 32 is 3 degrees. In L5, the ratio between the height H of the serration unit 32 and the width W of the serration unit 32 is 3, that is, H/W is 3, and the angle between the body 31 of the test pattern-mounted noise reducer 30 and the serration unit 32 is 3 degrees. In L6, the ratio between the height H of the serration unit 32 and the width W of the serration unit 32 is 1, that is, H/W is 1, and the angle between the body 31 of the test pattern-mounted noise reducer 30 and the serration unit 32 is 3 degrees.

As can be seen from fig. 13, L4 represents a noise result that is about 3dBA lower than baseline, L5 represents a noise result that is about 3.5dBA lower than baseline, and L6 represents a noise result that is about 2dBA lower than baseline. Compare in the datum line, the noise result that L4, L5 and L6 represented all is less than the noise reduction effect that the datum line represented, consequently, has installed when the test model the utility model discloses when noise reduction device 30 of embodiment, the noise that is provided with noise reduction device 30's test model was surveyed to the microphone array method is showing and is reducing. It is true to verify the utility model discloses the noise that falls device 30 of making an uproar can show and reduce test model and produce at the operation in-process, through installing on test model the utility model discloses the noise that falls device 30 of making an uproar can reduce about 2dBA ~ 3.5 dBA's noise.

Referring to fig. 14, wherein L9 is a diagram of an experimental result of a test model with a noise reducer 30 according to an embodiment of the present invention installed thereon, in this case, the structure of the saw tooth unit 32 of the noise reducer 30 may be as shown in fig. 7, and the edge of the saw tooth unit 32 has a saw tooth structure 322. L7, L8 have respectively been the test model and have installed the utility model discloses the experimental results picture of noise reduction device 30 of another embodiment, at this moment, the structure of sawtooth unit 32 of noise reduction device 30 can be for fig. 8 or fig. 9 show, the edge of sawtooth unit 32 has a plurality of sawtooth structures 322, and is specific, and L7 is the test model and has installed the experimental results picture of noise reduction device 30 that fig. 9 shows, and L8 is the test model and has installed the experimental results picture of noise reduction device 30 that fig. 8 shows.

As can be seen from fig. 14, the noise result represented by L7 is about 2.5dBA lower than the baseline, the noise result represented by L8 is about 5dBA lower than the baseline, and the noise result represented by L9 is about 3.5dBA lower than the baseline. Through setting up on test model the utility model discloses the noise level that the reduction test model that falls device 30 can be obvious produced when the operation can be seen from figure 14, through installing on test model the utility model discloses a device 30 of making an uproar falls can reduce about 2.5dBA ~ 5 dBA's noise for the datum line.

Through the experiment proof, the embodiment of the utility model provides a noise reduction device 30 can show the noise that reduces test model and produce at the operation in-process, consequently, according to the utility model provides a noise reduction device 30 when using to blade 100, can effectively improve blade 100's the noise reduction effect. It is understood that the user can design the ratio between the height H and the width W of the saw tooth unit 32 and the angle value between the body 31 and the saw tooth unit 32 according to actual requirements.

To sum up, the embodiment of the utility model provides a noise reduction device 30, body 31 can carry out stable connection with blade 100 through installation department 311, and sawtooth unit 32 is connected with body 31, and the edge of sawtooth unit 32 has sawtooth structure 322 for the torrent on blade 100 surface of flowing through forms a plurality of reverse vortex pairs and offsets each other. When the noise reducer 30 is applied to the blade 100, the sawtooth structure 322 can change the turbulent flow condition on the surface of the blade 100, break up the vortex pair on the surface of the blade 100, and reduce the energy of the vortex pair, so as to reduce the pulsating pressure generated when the vortex pair acts on the surface of the blade 100, and further reduce the noise generated during the operation of the blade 100. Further, the body 31 and the sawtooth unit 32 of the noise reduction device 30 are arranged at a preset angle, and on the premise that the body 31 is stably connected with the blade root 15 of the blade 100, the sawtooth unit 32 can better damage the blade 100 to generate a vortex on the surface of the blade 100 in the rotating process, so that the noise reduction effect is improved.

The embodiment of the present invention further provides a blade forming method, please refer to fig. 15, and fig. 15 shows a flowchart of the blade forming method according to an embodiment of the present invention.

The utility model discloses a blade forming method of embodiment, including following step:

and S110, providing a shell.

And S120, connecting a noise reduction device on the shell to form the blade.

Wherein, the noise reduction device is the noise reduction device provided by any of the above embodiments.

The embodiment of the utility model provides a blade forming method, include to connect noise reduction device 30 on shell 10 to form blade 100, noise reduction device 30 is for adopting the noise reduction device 30 that any above-mentioned embodiment provided, make blade 100 after the shaping in the operation process, noise reduction device 30 can form a plurality of directions vortex pairs and offset each other with the torrent on the 100 surfaces of blade of flowing through, thereby can carry out effectual control to the noise on the transmission route, improve noise reduction device 30's noise reduction effect.

Prior to step S110, a step of forming a housing may be included, which in some embodiments may include:

step 1, providing a windward shell and a leeward shell.

And 2, adhering the web plate to one of the windward shell or the leeward shell.

And step 3, assembling the windward shell and the leeward shell to form the shell.

In the step of forming the outer shell, the web 20 may be bonded to the bonding region of the web 20 of the windward shell 11 by applying an adhesive such as epoxy resin or the like to the web 20 with the inner surface of the windward shell 11 facing upward using an adhesive application tool. It is understood that the web 20 may be bonded to the leeward shell 12 first, but the invention is not limited thereto.

In step S120, a glue tool may be used to coat epoxy resin or the like on the surface of the housing 10, and the body 31 of the noise reducer 30 may be adhered to the surface of the housing 10. The blade 100 includes a root portion 15 and a tip portion 16, and the noise reducer 30 may be bonded to the tip portion 16 of the blade 100, or the noise reducer 30 may be mounted along the entire axial direction of the blade 100. In some embodiments, the noise reducer 30 may be mounted on the windward shell 11 or may be mounted on the leeward shell 12 to reduce aerodynamic noise in all directions of the blade 100.

To sum up, the embodiment of the utility model provides a noise reduction device 30, blade 100 and blade forming method fall noise reduction device 30 and can form a plurality of directions vortex pair and offset each other with the torrent on blade 100 surface of flowing through to the at utmost reduces the aerodynamic noise that blade 100 produced in the operation process, improves the quality of blade 100 and the stability of blade 100 operation, so, easily uses widely.

It is to be understood that relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation or arrangement in sequences other than those illustrated or otherwise described herein.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.

Claims

1. A noise reducer for a blade, the noise reducer comprising:

a body including a mounting portion through which the body can be connected with the blade;

the sawtooth unit, with this body coupling, the edge of sawtooth unit has the sawtooth structure, the sawtooth unit with be between the body and predetermine angle alpha and set up, predetermine angle alpha and satisfy: alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

2. The noise reduction device according to claim 1, wherein the preset angle α is 3 °.

3. The noise reducer according to claim 1, wherein an edge of the saw tooth unit has a plurality of the saw tooth structures, and the plurality of the saw tooth structures are arranged in a shrinking manner in a direction away from the body.

4. The noise reduction device of claim 3, wherein the sawtooth structures are triangular.

5. The noise reduction device according to claim 3, wherein the sawtooth unit includes a base side and two intersecting reference sides, and an extension line of the two reference sides and the base side form a virtual triangle together;

the sawtooth unit includes a plurality of noise reduction portions of interconnect, a plurality of noise reduction portions all arrange in the virtual triangle-shaped, noise reduction portion is polygonal structure, a plurality of noise reduction portions follow and deviate from the direction of body sets gradually, the edge interconnect of a plurality of noise reduction portions forms a plurality of sawtooth structures.

6. The noise reduction device according to claim 5, wherein adjacent noise reduction portions are disposed obliquely to each other.

7. The noise reduction device according to claim 6, wherein the number of the plurality of noise reducing portions is equal to or greater than three.

8. The noise reducer according to claim 5, wherein the noise reducer comprises a connecting portion and a saw-tooth portion connected to each other, the saw-tooth portion forms the saw-tooth structure, the connecting portion and the saw-tooth portion are arranged obliquely to each other, and the oblique angle between the connecting portion and the saw-tooth portion is 1 ° to 3 °.

9. The noise reducer according to claim 1, wherein the noise reducer is mountable to the blade with a first chord length corresponding to the saw tooth unit in a height direction of the saw tooth unit, the saw tooth unit including a base side and an apex facing away from the base side, a distance between the base side and the apex being a height of the saw tooth unit;

wherein the height of the sawtooth unit is 15% -20% times of the corresponding first chord length.

10. The noise reducer according to claim 9, wherein the length of the bottom side of the saw tooth unit is the width of the saw tooth unit, and the height of the saw tooth unit is 3 times the width of the saw tooth unit.

11. The noise reduction device of claim 1, wherein the body is integrally formed with the sawtooth unit.

12. A blade, comprising:

a housing including a trailing edge;

a noise reducer according to any of claims 1 to 11, disposed on the trailing edge of the shell.