Noise reduction structure of wind turbine generator

Abstract

The invention relates to the technical field of wind power generation, and discloses a noise reduction structure of a wind turbine generator, comprising: a cabin, a cabin wall of which is provided with a cabin air outlet; the generator is arranged in the cabin, a shell of the generator is provided with a generator air outlet, the generator air outlet is suitable for leading out hot air in the generator, and the hot air led out from the generator air outlet flows in the first direction; the silencer is fixedly arranged relative to the generator, the silencer comprises a shell and a plurality of silencing pieces arranged in the shell, the shell is provided with a first air inlet port and a first air outlet port which are oppositely arranged, the first air inlet port is arranged towards the air outlet of the generator, and the first air outlet port is arranged towards the air outlet of the cabin; the projection of the first air inlet port on the plane where the first air outlet port is located partially coincides with the first air outlet port, the silencing pieces extend in the second direction and are distributed at intervals, and the second direction is parallel to the first direction. Noise reduction effect is good, and generator cooling effect is prevented from being affected.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a noise reduction structure of a wind turbine generator set. Background Art

[0002] As wind turbines develop towards larger sizes, the noise of wind turbines is also increasing. In order to meet the low noise requirements put forward by customers, it is necessary to set up a noise reduction structure to reduce the noise. The noise at the generator outlet mainly comes from the electromagnetic noise of the motor and the ventilation noise generated during the rotation of the rotor radial ventilation duct. At present, the mainstream noise reduction solution for direct-cooled motors is to stick silencer materials on the inner wall of the ventilator or set up multiple silencer sheets inside the ventilator to form a noise reduction structure to absorb noise.

[0003] However, the noise reduction effect of the sound-absorbing material pasted on the inner wall of the ventilator is not obvious, and due to the limitations of the internal space of the wind turbine cabin and the location of the generator, the air outlet on the cabin cannot be completely opposite to the generator outlet. The change in the internal structure of the ventilator affects the wind resistance, which will cause the cooling effect of the ventilator on the generator to decrease, affecting the temperature rise of the motor. Summary of the invention

[0004] In view of this, the present invention provides a noise reduction structure for a wind turbine generator set to solve the problem that the noise reduction structure has a poor noise reduction effect and affects the cooling effect of the generator.

[0005] The present invention provides a noise reduction structure for a wind turbine generator set, comprising: a nacelle, a nacelle air outlet is provided on a nacelle wall of the nacelle; a generator, arranged inside the nacelle, a generator air outlet is provided on a shell of the generator, the generator air outlet is suitable for exporting hot air inside the generator, and the hot air exported by the generator air outlet flows along a first direction; a muffler, fixedly arranged relative to the generator, the muffler comprises an outer shell and a plurality of muffler sheets arranged inside the outer shell, the outer shell has a first air inlet port and a first air outlet port that are relatively arranged, the first air inlet port is arranged toward the generator air outlet, the first air outlet port is arranged toward the nacelle air outlet, a projection of the first air inlet port on a plane where the first air outlet port is located partially overlaps with the first air outlet port, the muffler sheets extend along a second direction, and a plurality of the muffler sheets are distributed at intervals, wherein the second direction is parallel to the first direction.

[0006] Beneficial effect: by arranging a muffler between the generator air outlet and the cabin air outlet, the hot air exhausted from the generator air outlet is guided to the cabin air outlet through the muffler; by arranging a plurality of muffler plates inside the shell of the muffler, the plurality of muffler plates divide the internal space of the muffler into a plurality of flow channels, thereby increasing the area for absorbing noise energy and enhancing the noise absorption effect; and by arranging the projection of the first air inlet port of the shell on the plane where the first air outlet port is located to partially overlap with the first air outlet port, so that the first air inlet port and the first air outlet port are staggered, the flow channel direction inside the shell is consistent with the air flow direction from the generator air outlet to the cabin air outlet, and the first direction in which the muffler plates extend is parallel to the second direction of the gas flow, so that the muffler plates are arranged along the air flow direction, avoiding the surface of the muffler plates with a larger area facing the wind, which can reduce wind resistance, reduce the impact on the wind path, and ensure that the airflow derived from the generator air outlet can smoothly reach the cabin air outlet and be discharged from the cabin, taking away the heat generated by the generator, and avoiding affecting the cooling effect of the generator.

[0007] In an optional embodiment, the shell includes a top wall, a bottom wall, and two side walls connected between the top wall and the bottom wall, and the side walls extend along a third direction, wherein the third direction is parallel to the first direction and the second direction.

[0008] Beneficial effect: By arranging the outer shell to consist of a top wall, a bottom wall and two side walls connected between the top wall and the bottom wall, and the extension direction of the side wall is in the same direction as the airflow direction and the extension direction of the silencer plate, the wind resistance is further reduced, ensuring that the airflow passes through the silencer smoothly and the heat dissipation performance of the generator is guaranteed. At the same time, the side wall is arranged along the direction of gas flow to avoid the side wall facing the wind, thereby reducing the noise generated by the airflow blowing onto the side wall, and further ensuring the noise reduction effect.

[0009] In an optional embodiment, the first air inlet port is rectangular, the long side of the rectangle extends along the fourth direction, a plurality of the sound-absorbing plates are spaced apart along the fourth direction, the distance between two adjacent sound-absorbing plates along the fourth direction is L, the vertical distance between the first air inlet port and the first air outlet port is H, the side wall is connected to the short side of the rectangle, the inclination angle of the side wall relative to the plane where the first air inlet port is located is α, wherein L, H, and α satisfy the relationship: α=arctan(L / H).

[0010] Beneficial effect: By setting the first air inlet port to be rectangular, corresponding to the shell with a quadrilateral cross-section, it is easy to process, and by setting a plurality of silencer sheets at intervals along the direction where the long side of the rectangle is located, the number of silencer sheets can be set as much as possible, and the channel space inside the shell can be fully utilized, so as to enhance the noise absorption effect as much as possible. At the same time, by setting the distance L between two adjacent silencer sheets along the fourth direction, the vertical distance H between the first air inlet port and the first air outlet port, and the inclination angle α of the side wall relative to the plane where the first air inlet port is located to satisfy the relationship: α=arctan(L / H), the design of the upper side wall of the muffler is linked to the relationship between the first air inlet port and the first air outlet port and the design of the silencer sheet, and the inclination angle of the side wall relative to the plane where the first air inlet port is located is reasonably set to ensure the rationality of the overall structural design of the muffler, reduce the wind resistance of the muffler to the gas flowing out of the generator outlet, ensure the cooling effect of the generator, and at the same time improve the noise reduction effect of the muffler.

[0011] In an optional embodiment, a partition cavity is formed between two adjacent sound-absorbing plates, and the orthographic projection of each of the sound-absorbing plates on the plane where the first air inlet port is located at least covers an opening area of ​​one of the partition cavities.

[0012] Beneficial effect: A plurality of silencer sheets divide the internal space of the shell into a plurality of partition chambers, and the air flows through the plurality of partition chambers. By arranging that the orthographic projection of each silencer sheet on the plane where the first air inlet port is located just covers the interval area between two adjacent silencer sheets or exceeds the interval area, it can be ensured that the position inside the shell facing the opening area of ​​the partition chamber is completely covered by the silencer sheet, thereby ensuring that the noise in the flow channel formed by the partition chamber can be fully absorbed, thereby improving the noise reduction effect.

[0013] In an optional embodiment, the sound-absorbing plate has a head portion close to the first air inlet port and a tail portion close to the first air outlet port; a first air guide surface arranged at an acute angle to the second direction is constructed on the head portion, and the number of the first air guide surfaces on each of the sound-absorbing plates is two, and the two first air guide surfaces are symmetrically arranged on both sides of the sound-absorbing plate along the thickness direction of the sound-absorbing plate; and / or a second air guide surface arranged at an acute angle to the second direction is constructed on the tail portion, and the number of the second air guide surfaces on each of the sound-absorbing plates is two, and the two second air guide surfaces are symmetrically arranged on both sides of the sound-absorbing plate along the thickness direction of the sound-absorbing plate.

[0014] Beneficial effect: By constructing two first air guide surfaces symmetrically arranged along the thickness direction of the muffler at the head of the muffler, and an acute angle between the first air guide surface and the second direction, the head of the muffler is sharp-angled, which plays a diversion and guiding role on the airflow flowing into the muffler, improves the stability of gas flow, reduces wind resistance, and thus reduces the obstruction of the muffler to the airflow, avoids poor gas flow and the inability to take away heat in time, thereby avoiding excessive impact on the temperature rise of the generator, ensuring the normal operation of the generator, and at the same time can also reduce the noise generated by the collision of the airflow and the muffler. By constructing two second air guide surfaces symmetrically arranged along the thickness direction of the muffler at the tail of the muffler, and an acute angle between the second air guide surface and the second direction, the tail of the muffler is sharp-angled, which plays a smooth transition guiding effect on the gas, ensures the stability during the discharge from the first air outlet, thereby ensuring the smoothness of the gas flow and can reduce noise.

[0015] In an optional embodiment, the sound-absorbing plate has a head portion close to the first air inlet port and a tail portion close to the first air outlet port; the head portion is configured as a rounded corner, and / or the tail portion is configured as a rounded corner.

[0016] Beneficial effects: By constructing the head with rounded corners for transition, the rounded corners have a smooth transition and good flow guiding effect, which can effectively reduce wind resistance, thereby reducing the obstruction of the muffler to the airflow, avoiding poor gas flow and the inability to take away heat in time, thereby avoiding excessive impact on the temperature rise of the generator, ensuring the normal operation of the generator, and at the same time reducing the noise generated by the collision between the airflow and the muffler. By constructing the tail with rounded corners for transition, the gas can also have a smooth transition flow guiding effect, ensuring stability during the discharge process from the first air outlet, thereby ensuring the smoothness of the gas flow and reducing noise.

[0017] In an optional embodiment, the noise reduction structure of the wind turbine group also includes: a ventilation duct, the ventilation duct having a second air inlet port and a second air outlet port relatively arranged, the second air inlet port is connected to the first air outlet port, and the second air outlet port is connected to the cabin air outlet to connect the first air outlet port with the cabin air outlet.

[0018] Beneficial effect: By connecting a ventilator between the first air outlet port of the muffler and the cabin air outlet, the muffler is connected to the cabin air outlet, and the internal channel of the muffler is connected to the outside of the cabin, which plays a ventilation connection role and effectively discharges the airflow passing through the muffler outside the cabin, thereby achieving ventilation and cooling effect on the generator.

[0019] In an optional embodiment, the ventilation tube is a soft tube, and the material of the ventilation tube includes sound-absorbing material.

[0020] Beneficial effect: By setting the ventilation duct as a soft duct, it not only plays the role of ventilation connection, but also can adjust the length of the ventilation duct appropriately according to needs, so as to adjust the distance between the muffler and the cabin air outlet. It has high flexibility and a wide range of applications. In addition, by setting the ventilation duct to adopt sound-absorbing material, part of the noise energy can be consumed on the wall of the ventilation duct, effectively absorbing noise. On the basis of the noise absorbed by the muffler, the residual noise is further absorbed, thereby further enhancing the noise reduction effect of the noise reduction structure.

[0021] In an optional embodiment, the noise reduction structure of the wind turbine group also includes: an elbow, the elbow having a third air inlet port and a third air outlet port that are relatively arranged, the third air inlet port is connected to the second air outlet port and the nacelle air outlet, and the elbow is arranged on the outside of the nacelle, and the third air outlet port opens downward.

[0022] Beneficial effect: by setting the third air inlet port of the elbow to be connected with the second air outlet port of the ventilator and the air outlet of the cabin, and the elbow is located on the outside of the cabin, the air flow flowing through the muffler and the ventilator can be discharged to the outside of the cabin through the elbow. The elbow replaces the traditional shutter structure, and the third air outlet port of the elbow opens downward, changing the air outlet direction. The side wall of the elbow forms a shield, which can reduce the turbulence effect of the airflow formed by the rotation of the impeller of the wind turbine on the airflow discharged from the third air outlet port, thereby reducing the impact on the airflow flowing out of the generator outlet, further ensuring the ventilation and cooling effect of the generator and enhancing the noise reduction effect. The elbow can also play a role in shielding rain and snow, further protecting the internal structure of the cabin.

[0023] In an optional embodiment, the silencer is detachably connected to the ventilator, the ventilator is detachably connected to the cabin wall, and the elbow is detachably connected to the cabin wall.

[0024] Beneficial effects: The silencer, ventilator and elbow are easy to disassemble and assemble, the noise reduction structure of the wind turbine can be installed in parts, is easy to maintain and does not occupy much cabin space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a noise reduction structure of a wind turbine generator set according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0028] Figure 3 It is a schematic diagram of the positional relationship of the muffler, ventilator and elbow before assembly according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the muffler, the ventilator and the elbow after being assembled into a noise reduction device according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A top view of the noise reduction device shown;

[0031] Figure 6 for Figure 4 A side view of the noise reduction device shown;

[0032] Figure 7 for Figure 6 A partial enlarged schematic diagram of the cross-section along the BB direction;

[0033] Figure 8 for Figure 7 A partial enlarged schematic diagram of C in the middle;

[0034] Fig. 9 for Figure 7 A partial enlarged schematic diagram of D in the middle;

[0035] Fig.10 This is a front view of the noise reduction structure of the wind turbine.

[0036] Description of reference numerals:

[0037] 1. Muffler; 110. Shell; 111. Top wall; 112. Side wall; 101. First air inlet port; 102. First air outlet port; 120. Muffler; 121. Head; 122. Tail; 123. First air guide surface; 124. Second air guide surface; 130. Partition chamber; 2. Ventilator; 201. Second air inlet port; 202. Second air outlet port; 3. Elbow; 301. Third air inlet port; 302. Third air outlet port; 4. Bolt; 5. Cabin wall; 501. Cabin air outlet; 6. Generator; 601. Generator air outlet. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] The generator in the wind turbine is located in the cabin. The generator will generate a lot of heat during operation. If the heat is not discharged in time, the generator may operate in a high temperature environment, causing the motor or other internal components to overheat or even burn out. The generator ventilation system can discharge the hot air inside the generator through the generator air outlet to ensure the heat dissipation effect, thereby maintaining the normal working state of the generator. The location of the generator air outlet is usually designed on the outer casing of the generator, and common locations include the two ends or sides of the generator. The hot air discharged through the generator air outlet forms an air flow, and is finally discharged from the cabin through the cabin air outlet opened on the cabin wall of the cabin. However, due to the influence of the cabin's external structure and its internal space design, the cabin air outlet cannot be completely opposite to the generator air outlet. In the process of gas flowing from the generator air outlet to the cabin air outlet, the flow direction of the air flow forms an angle with the extension direction of the silencer in the traditional noise reduction structure. The air flow blows to the surface of the silencer at a certain angle, and the silencer will produce a large wind resistance to the air flow, resulting in the air flow being unable to be discharged smoothly from the cabin air outlet, thereby failing to discharge the hot air inside the generator in time, causing the generator temperature to rise too high, and additional noise will also be generated during the collision of the air flow with the silencer.

[0040] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0041] According to an embodiment of the present invention, a noise reduction structure of a wind turbine is provided, comprising: a nacelle, a generator 6 and a muffler 1 . A cabin air outlet 501 is provided on the cabin wall 5 of the cabin; the generator 6 is arranged inside the cabin, and a generator air outlet 601 is provided on the shell of the generator 6, and the generator air outlet 601 is suitable for exporting the hot air inside the generator 6, and the hot air exported by the generator air outlet 601 flows along a first direction; the muffler 1 is relatively fixedly arranged with the generator 6, and the muffler 1 includes an outer shell 110 and a plurality of muffler sheets 120 arranged inside the outer shell 110, and the outer shell 110 has a first air inlet port 101 and a first air outlet port 102 that are relatively arranged, the first air inlet port 101 is arranged toward the generator air outlet 601, and the first air outlet port 102 is arranged toward the cabin air outlet 501, and the projection of the first air inlet port 101 on the plane where the first air outlet port 102 is located partially overlaps with the first air outlet port 102, and the muffler sheets 120 extend along the second direction, and a plurality of muffler sheets 120 are distributed at intervals, wherein the second direction is parallel to the first direction. Among them, the first direction refers to Figure 5 The "first direction" indicated by the arrow in the middle and the second direction refer to Figure 5 The “second direction” indicated by the arrow in the figure.

[0042] The noise reduction structure of the wind turbine generator set of the present embodiment is applied. By arranging the muffler 1 between the generator air outlet 601 and the cabin air outlet 501, the hot air exhausted from the generator air outlet 601 is guided to the cabin air outlet 501 through the muffler 1. By arranging a plurality of muffler sheets 120 inside the shell 110 of the muffler 1, the plurality of muffler sheets 120 divide the internal space of the muffler 1 into a plurality of flow channels, thereby increasing the area for absorbing noise energy, enhancing the effect of absorbing noise, and achieving good noise reduction effect. In addition, by arranging the projection of the first air inlet port 101 of the shell 110 on the plane where the first air outlet port 102 is located and the first air outlet port 102 part The outer shell 110 and the outer shell 110 are arranged in a staggered manner, and the direction of the flow channel inside the outer shell 110 is consistent with the direction of the airflow from the generator air outlet 601 to the cabin air outlet 501, and the first direction in which the muffler plate 120 extends is parallel to the second direction of the gas flow, so that the muffler plate 120 is arranged along the airflow direction, avoiding the larger surface area of ​​the muffler plate 120 facing the wind, which can reduce wind resistance and reduce the impact on the wind path, and ensure that the airflow derived from the generator air outlet 601 can smoothly reach the cabin air outlet 501 and be discharged from the cabin, taking away the heat generated by the generator 6, and avoiding affecting the cooling effect of the generator.

[0043] It should be noted that the first air inlet port 101 of the muffler 1 is opposite to the generator air outlet 601 on the generator 6, and the first air outlet port 102 of the muffler 1 is opposite to the cabin air outlet 501 on the cabin wall 5, wherein the projection of the generator air outlet 601 on the cabin wall 5 where the cabin air outlet 501 is arranged partially overlaps with the cabin air outlet 501, that is, the cabin air outlet 501 is not completely opposite to the generator air outlet 601, and the orthographic projection of the first air inlet port 101 of the muffler 1 on the plane where the first air outlet port 102 is located partially overlaps with the first air outlet port 102, that is, the first air inlet port 101 and the first air outlet port 102 are not completely opposite to each other, and the internal channel of the outer shell 110 is directed from the first air inlet port 101 to the first air outlet port 102, which is consistent with the airflow direction from the generator air outlet 601 to the cabin air outlet 501, and the gas is subjected to less resistance.

[0044] In one embodiment, the sound-absorbing sheet 120 is composed of a sound-absorbing material and a porous mesh. The sound-absorbing sheet 120 uses sound-absorbing material to absorb noise and has the performance of resistive noise reduction for the high-frequency noise of the motor. The porous mesh is used to strengthen the structural strength of the sound-absorbing sheet 120, provide support for the sound-absorbing material, and will not affect the sound-absorbing material's absorption of noise.

[0045] Optionally, the sound absorbing material is glass fiber or rock wool textile, and the porous mesh panel is a metal porous mesh panel.

[0046] Preferably, the sound-absorbing sheet 120 is made of fiber-type sound-absorbing cotton and aluminum porous mesh, which has good sound absorption effect and is light in weight. Specifically, the porous mesh is used as a shell, and the shell is filled with sound-absorbing cotton.

[0047] In one embodiment, the housing 110 includes a top wall 111, a bottom wall, and two side walls 112 connected between the top wall 111 and the bottom wall, and the side walls 112 extend along a third direction, wherein the third direction is parallel to the first direction and the second direction. It should be noted that the housing 110 is formed by the top wall 111, one side wall 112, the bottom wall, and the other side wall 112 connected end to end to form a cylindrical shape with two ends open, wherein the top wall 111 and the bottom wall are arranged opposite to each other, and the two side walls 112 are arranged opposite to each other; the third direction refers to Figure 5 The arrow in the middle indicates the "third direction". By arranging the housing 110 to be composed of a top wall 111, a bottom wall and two side walls 112 connected between the top wall 111 and the bottom wall, and the extension direction of the side wall 112 is the same as the airflow direction and the extension direction of the muffler sheet 120, the wind resistance is further reduced, ensuring that the airflow passes smoothly through the muffler 1, ensuring the heat dissipation performance of the generator 6, and at the same time, the side wall 112 is arranged along the direction of gas flow to avoid the side wall 112 facing the wind, thereby reducing the noise generated by the airflow blowing on the side wall 112, and further ensuring the noise reduction effect.

[0048] Specifically, the side wall 112 is inclined relative to the plane where the first air inlet port 101 and the first air outlet port 102 of the outer shell 110 are located, and the top wall 111 and the bottom wall are parallelograms; the orthographic projection of the outer shell 110 on the cross section parallel to the plane where the first air inlet port 101 is located is a quadrilateral.

[0049] In one embodiment, the first air inlet port 101 is rectangular, and the long side of the rectangle extends along the fourth direction. Figure 6 As shown, a plurality of muffler sheets 120 are arranged at intervals along the fourth direction, the distance between two adjacent muffler sheets 120 along the fourth direction is L, the vertical distance between the first air inlet port 101 and the first air outlet port 102 is H, the side wall 112 is connected to the short side of the rectangle, and the inclination angle of the side wall 112 relative to the plane where the first air inlet port 101 is located is α, wherein L, H, and α satisfy the relationship: α = arctan (L / H). The fourth direction refers to Figure 6 The middle arrow points to a “fourth direction”; the top wall 111 and the bottom wall of the housing 110 are respectively connected to a long side of the rectangle, and the two side walls 112 are respectively connected to a short side of the rectangle.

[0050] By setting the first air inlet port 101 to be rectangular, corresponding to the housing 110 with a quadrilateral cross section, processing is facilitated, and by setting a plurality of muffler sheets 120 to be spaced apart in the direction of the long side of the rectangle, the number of muffler sheets 120 can be set as much as possible, and the channel space inside the housing 110 can be fully utilized, thereby enhancing the noise absorption effect as much as possible. At the same time, by setting the distance L between two adjacent muffler sheets 120 along the fourth direction, the vertical distance H between the first air inlet port 101 and the first air outlet port 102, and the distance H between the side wall 112 and the first air inlet port 101, the noise absorption effect can be enhanced as much as possible. The inclination angle α of the plane where the first air inlet port 101 is located satisfies the relationship: α=arctan(L / H), and the design of the upper side wall 112 of the muffler 1 is linked to the relationship between the first air inlet port 101 and the first air outlet port 102 and the design of the muffler plate 120. The inclination angle of the side wall 112 relative to the plane where the first air inlet port 101 is located is reasonably set to ensure the rationality of the overall structural design of the muffler 1, reduce the wind resistance of the muffler 1 to the gas flowing out of the generator outlet 601, ensure the cooling effect of the generator 6, and at the same time improve the noise reduction effect of the muffler 1.

[0051] It should be noted that the distance L between two adjacent sound-absorbing sheets 120 along the fourth direction depends on the thickness of the sound-absorbing sheet 120 and the vertical spacing between the two adjacent sound-absorbing sheets 120. Specifically, the thickness of the sound-absorbing sheet 120 is between 20 mm and 40 mm, and the vertical spacing between the two adjacent sound-absorbing sheets 120 is 1 to 1.5 times the thickness of the sound-absorbing sheet. The thickness of the sound-absorbing sheet 120 refers to the distance L between the sound-absorbing sheet 120 and the vertical spacing between the two adjacent sound-absorbing sheets 120. Figure 8The dimension in the "thickness direction" shown in the figure, the vertical spacing between two adjacent silencer plates 120 refers to the vertical distance between two relatively arranged surfaces of the two adjacent silencer plates 120; the vertical distance H between the first air inlet port 101 and the first air outlet port 102 determines the length of the silencer plate 120, and the larger H is, the greater the noise reduction is.

[0052] In one embodiment, a partition cavity 130 is formed between two adjacent muffler sheets 120, and the orthographic projection of each muffler sheet 120 on the plane where the first air inlet port 101 is located at least covers the opening area of ​​one partition cavity 130. The opening area of ​​the partition cavity 130 refers to the interval area between two adjacent muffler sheets 120 on the plane where the first air inlet port 101 is located. A plurality of muffler sheets 120 divide the internal space of the housing 110 into a plurality of partition cavities 130, and air flows through the plurality of partition cavities 130. By setting the orthographic projection of each muffler sheet 120 on the plane where the first air inlet port 101 is located to just cover the interval area between two adjacent muffler sheets 120 or to exceed the interval area, it can be ensured that the position facing the opening area of ​​the partition cavity 130 inside the housing 110 is completely covered by the muffler sheet 120, thereby ensuring that the noise in the flow channel formed by the partition cavity 130 can be fully absorbed, thereby improving the noise reduction effect.

[0053] Further integration Figure 7 As shown, the muffler sheet 120 has a head portion 121 close to the first air inlet port 101 and a tail portion 122 close to the first air outlet port 102, and the shorter of the connecting lines between the head portion 121 of a muffler sheet 120 and the tail portion 122 of an adjacent muffler sheet 120 is the first connecting line (i.e. Figure 7 The angle between the first connecting line and the plane where the first air inlet port 101 is located is θ, wherein θ≤90°, thereby ensuring that the orthographic projection of the sound-absorbing sheet 120 on the plane where the first air inlet port 101 is located covers at least the opening area of ​​one partition cavity 130, so as to ensure that the noise in the partition cavity 130 can be fully absorbed.

[0054] In one embodiment, further combining Figures 7 and 8 As shown, the head 121 is configured with a first air guide surface 123 arranged at an acute angle to the second direction, and the number of first air guide surfaces 123 on each muffler sheet 120 is two, and the two first air guide surfaces 123 are symmetrically arranged on both sides of the muffler sheet 120 along the thickness direction of the muffler sheet 120. The thickness direction refers to Figure 8The "thickness direction" indicated by the middle arrow is perpendicular to the airflow direction (first direction). By constructing two first air guide surfaces 123 symmetrically arranged along the thickness direction of the muffler 120 on the head 121 of the muffler 120, and the first air guide surface 123 forms an acute angle with the second direction, the head 121 of the muffler 120 is pointed, which plays a diversion and guiding role for the airflow flowing into the muffler 1, improves the stability of gas flow, reduces wind resistance, and thus reduces the obstruction of the muffler 120 to the airflow, avoids poor gas flow and the inability to take away heat in time, thereby avoiding excessive impact on the temperature rise of the generator, ensuring the normal operation of the generator, and at the same time reducing the noise generated by the collision of the airflow and the muffler 120.

[0055] In addition, in other embodiments, the head 121 can also be constructed as a rounded corner (not shown in the figure). The head 121 of the muffler 120 is used to face the wind, and first contacts the airflow flowing into the muffler 1. By constructing the head 121 as a rounded corner for transition, the rounded corner transition is smooth and the flow diversion effect is good, which can effectively reduce wind resistance, thereby reducing the obstruction of the muffler 120 to the airflow, avoiding poor gas circulation and failure to take away heat in time, thereby avoiding excessive impact on the temperature rise of the generator, ensuring the normal operation of the generator, and at the same time reducing the noise generated by the collision of the airflow and the muffler 120.

[0056] In one embodiment, further combining Figure 7 and Fig. 9 As shown, the tail portion 122 is configured with a second air guide surface 124 arranged at an acute angle with the second direction, and the number of the second air guide surfaces 124 on each muffler sheet 120 is two, and the two second air guide surfaces 124 are symmetrically arranged on both sides of the muffler sheet 120 along the thickness direction of the muffler sheet 120. It should be noted that after the gas flows through the partition cavity 130, it is discharged from the first air outlet port 102, and the tail portion 122 of the muffler sheet 120 is arranged close to the first air outlet port 102. By configuring two second air guide surfaces 124 symmetrically arranged along the thickness direction of the muffler sheet 120 at the tail portion 122 of the muffler sheet 120, and the second air guide surfaces 124 are arranged at an acute angle with the second direction, the tail portion 122 of the muffler sheet 120 is sharp-angled, which has a smooth transition guiding effect on the gas, ensures the stability of the gas during the discharge from the first air outlet port 102, thereby ensuring the smoothness of the gas flow and reducing the noise.

[0057] In addition, in other embodiments, the tail portion 122 may also be configured as a rounded corner. After the gas flows through the partition chamber 130, it is discharged from the first air outlet port 102. The tail portion 122 of the muffler sheet 120 is disposed close to the first air outlet port 102. By configuring the tail portion 122 as a rounded corner for transition, the gas can also be guided to smoothly transition, thereby ensuring stability during the discharge process from the first air outlet port 102, thereby ensuring smooth gas flow and reducing noise.

[0058] Preferably, the head 121 and the tail 122 of the muffler 120 are both configured as bevels, that is, two first wind guide surfaces 123 are configured on the head 121, and two second wind guide surfaces 124 are configured on the tail 122, which can effectively reduce wind resistance. It can be understood that, as an alternative embodiment, the head 121 and the tail 122 can also be configured as rounded corners, or one of the head 121 and the tail 122 is configured as a bevel and the other is configured as a rounded corner.

[0059] Specifically, the first wind guide surface 123 and the second wind guide surface 124 are both planes, which are convenient to process and easy to shape. Preferably, the two first wind guide surfaces 123 are connected by a rounded transition, which can further reduce wind resistance and reduce turbulence to the gas.

[0060] Preferably, the angle between the two first wind guide surfaces 123 is β1, wherein the value range of β1 is: 45°≤β1≤90°; the angle between the two second wind guide surfaces 124 is β2, wherein the value range of β2 is: 45°≤β2≤90°, which can minimize wind resistance.

[0061] It should be noted that by constructing the head 121 and the tail 122 of the silencer 120 as rounded or beveled transitions, the wind resistance of the silencer 120 can be effectively reduced, which can generally be controlled within 160Pa, so that the temperature rise of the generator 6 can be controlled within 3K, effectively reducing the influence of the internal structure of the muffler 1 on the temperature rise of the generator.

[0062] In one embodiment, the noise reduction structure of the wind turbine generator set further includes: a ventilator 2, the ventilator 2 having a second air inlet port 201 and a second air outlet port 202 arranged opposite to each other, the second air inlet port 201 being connected to the first air outlet port 102, and the second air outlet port 202 being connected to the cabin air outlet 501, so as to connect the first air outlet port 102 with the cabin air outlet 501. By connecting the ventilator 2 between the first air outlet port 102 of the muffler 1 and the cabin air outlet 501, the muffler 1 is connected to the cabin air outlet 501, and the internal channel of the muffler 1 is connected to the outside of the cabin, which plays a ventilation connection role, effectively discharges the airflow flowing through the muffler 1 to the outside of the cabin, and realizes the ventilation and cooling effect on the generator.

[0063] Specifically, the ventilation duct 2 has openings at both ends, which are respectively a second air inlet port 201 and a second air outlet port 202 , wherein the second air inlet port 201 is opposite to and connected with the first air outlet port 102 , and the second air outlet port 202 is opposite to and connected with the cabin air outlet 501 .

[0064] In one embodiment, the opening area of ​​the second air outlet port 202 is smaller than the opening area of ​​the second air inlet port 201. Correspondingly, the opening area of ​​the first air outlet port 102 is smaller than the opening area of ​​the cabin air outlet 501. When the airflow flows through the ventilator 2, the air inlet area of ​​the ventilator 2 is smaller than the air outlet area of ​​the ventilator 2, so that the gas in the ventilator 2 forms a positive pressure state, and the gas flow is smoother and stronger, thereby improving the air circulation efficiency and enhancing the ventilation and cooling effect on the generator.

[0065] In one embodiment, the ventilator 2 is a soft tube, and the material of the ventilator 2 includes a sound-absorbing material. By setting the ventilator 2 as a soft tube, it not only plays a role in ventilation connection, but also can adjust the length of the ventilator 2 appropriately as needed to adjust the distance between the muffler 1 and the cabin air outlet 501, which has high flexibility and a wide range of applications. Moreover, by setting the ventilator 2 to use a sound-absorbing material, a part of the noise energy can be consumed on the wall of the ventilator 2, effectively absorbing the noise, and further absorbing the residual noise on the basis of the noise absorbed by the muffler 1, thereby further enhancing the noise reduction effect of the noise reduction structure.

[0066] Optionally, the material of the ventilator 2 is a sound-absorbing material with a high sound absorption coefficient, which can be a glass fiber or rock wool textile combined with a canvas or scraper cloth on the periphery. The glass fiber or rock wool textile can effectively absorb noise, and the canvas or scraper cloth is a flexible material, which is strong and durable, has good flexibility, and has a protective effect on the sound-absorbing material, thereby ensuring the sound absorption effect of the ventilator 2 and extending its service life.

[0067] It should be noted that both the ventilator 2 and the silencer 120 have a noise reduction effect, and the materials used for the ventilator 2 and the silencer 120 are Class A flame retardant materials (non-combustible), which reduces the risk of combustion and improves the safety and reliability of the wind turbine.

[0068] In one embodiment, the noise reduction structure of the wind turbine generator set further includes: an elbow 3, the elbow 3 has a third air inlet port 301 and a third air outlet port 302 arranged opposite to each other, the third air inlet port 301 is connected to the second air outlet port 202 and the cabin air outlet 501, and the elbow 3 is arranged on the outside of the cabin, and the third air outlet port 302 opens downward. Fig.10 As shown, the third air outlet port 302 opens downward, which means it is facing Fig.10The elbow 3 is open in the direction of "down" as indicated by the middle arrow. The elbow 3 is open at both ends, and the third air inlet port 301 of the elbow 3 is connected with the second air outlet port 202 of the ventilator 2 and the cabin air outlet 501, and the elbow 3 is located outside the cabin, so that the airflow flowing through the muffler 1 and the ventilator 2 is discharged to the outside of the cabin through the elbow 3. The elbow 3 replaces the traditional shutter structure, and the third air outlet port 302 of the elbow 3 opens downward, changing the air outlet direction. The side wall of the elbow 3 forms a shield, which can reduce the turbulence effect of the airflow formed by the rotation of the impeller of the wind turbine on the airflow discharged from the third air outlet port 302, thereby reducing the influence on the airflow flowing out of the generator air outlet 601, further ensuring the ventilation and cooling effect of the generator 6 and enhancing the noise reduction effect, and the elbow 3 can also play a role in shielding rain and snow, further protecting the internal structure of the cabin.

[0069] In one embodiment, the muffler 1 is detachably connected to the ventilator 2, the ventilator 2 is detachably connected to the cabin wall 5, and the elbow 3 is detachably connected to the cabin wall 5. The muffler 1, the ventilator 2, and the elbow 3 are convenient to disassemble and assemble, and the noise reduction structure of the wind turbine can be installed in parts, is easy to maintain, and does not occupy much cabin space. Specifically, the third air inlet port 301 of the elbow 3 is connected to the outside of the cabin wall 5 and faces the cabin air outlet 501, and the second air outlet port 202 of the ventilator 2 is connected to the inside of the cabin wall 5 and faces the cabin air outlet 501, thereby realizing the conduction between the elbow 3 and the ventilator 2, and the elbow 3 is detachably installed on the outside of the cabin wall 5 of the cabin, which is convenient for disassembly and assembly of the noise reduction structure, easy to maintain, and does not occupy much cabin internal space. The muffler 1, the ventilator 2, and the elbow 3 form a noise reduction device to achieve the guidance and noise reduction of the airflow blown out of the generator outlet 601.

[0070] It can be understood that, as an alternative embodiment, the third air inlet port 301 of the elbow 3 can also be first connected to the second air outlet port 202 of the ventilator 2 and then pass through the cabin air outlet 501.

[0071] In one embodiment, the muffler 1 is connected to the ventilator 2 by bolts 4, and the ventilator 2 is connected to the elbow 3 by bolts 4. The bolt connection is reliable, convenient for assembly and disassembly, and inexpensive and low in cost.

[0072] Specifically, flanges are provided at the first air outlet port 102 of the muffler 1, the second air inlet port 201 and the second air outlet port 202 of the ventilator 2, and the third air inlet port 301 of the elbow 3. Through holes are provided on the flanges, and bolts 4 pass through the through holes on the flanges to respectively connect the muffler 1 to the ventilator 2, and the ventilator 2 to the elbow 3. It can be understood that through holes can also be provided on the cabin wall 5 surrounding the cabin air outlet 501, and bolts pass through the through holes on the flange of the elbow 3, the through holes on the cabin wall 5, and the through holes on the flange at the second air outlet port 202 of the ventilator 2 in sequence, and then the elbow 3, the ventilator 2, and the cabin wall 5 are fixedly connected.

[0073] Optionally, the first air inlet port of the muffler 1 has a flange edge that is connected to the outer peripheral wall of the shell 110, and the muffler 1 is detachably connected to the generator 6 through the flange edge.

[0074] In addition, in other embodiments, the silencer 1 and the ventilator 2, and the ventilator 2 and the elbow 3 may also be flange-connected, riveted, or hoop-connected.

[0075] It should be noted that the generator 6 is arranged inside the nacelle, and a nacelle air outlet is provided on the nacelle wall 5 of the wind turbine set. Fig.10 As shown, the elbow 3 and the ventilator 2 are connected to the cabin wall 5, and the ventilation channel between the elbow 3 and the ventilator 2 corresponds to the cabin air outlet 501. The elbow 3 and the ventilator 2 are located on opposite sides of the cabin wall 5. Specifically, the elbow 3 is located Fig.10 On the "left" side of the cabin wall 5 indicated by the middle arrow, the ventilator 2 is located Fig.10 The arrow in the middle points to the "right" side of the cabin wall 5. The left side of the cabin wall 5 faces the outside of the cabin, and the right side of the cabin wall 5 faces the inside of the cabin, that is, the elbow 3 is located on the outside of the cabin, and the ventilator 2 and the muffler 1 are located on the inside of the cabin. The noisy airflow discharged from the generator outlet passes through the muffler 1 and the ventilator 2 in sequence, and then passes through the cabin outlet 501, and finally discharged from the cabin by the elbow 3, which not only realizes the ventilation and cooling effect on the generator, but also achieves the noise reduction effect.

[0076] It should be noted that Figure 1 and Fig.10 The nacelle wall 5 shown in the figure is a partial structure on the nacelle of the wind turbine generator set, and the nacelle of the wind turbine generator set is a closed structure as a whole.

[0077] The noise reduction structure of the generator set of this embodiment combines the silencer 1, the ventilator 2 and the elbow 3 to integrate multiple functions such as diversion, noise reduction, connection and rain protection. The noise reduction structure can be installed in parts, is easy to maintain and does not occupy much cabin space. While meeting the noise reduction effect, it has little effect on temperature rise.

[0078] The noise reduction structure of the generator set of this embodiment is that the edges of the head 121 and / or the tail 122 of the silencer 120 adopt rounded or beveled transitions, the resistive narrow channel silencer 120 has the same flow direction as the wind duct, has small wind resistance, good noise reduction effect, and little impact on the temperature rise of the generator; the silencer 120 adopts sound-absorbing fiber material to absorb noise, and has the performance of resistive noise reduction for the high-frequency noise of the motor; the ventilation duct 2 adopts sound-absorbing and flame-retardant materials to further enhance the noise reduction effect and improve the reliability of the wind turbine set; the air outlet of the elbow 3 is downward, replacing the traditional shutter structure, changing the air outlet direction, which is beneficial to reduce the turbulence effect of the impeller and has the effect of shielding rain and snow.

[0079] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A noise reduction structure for a wind turbine generator set, characterized in that: include: A cabin, wherein a cabin air outlet (501) is provided on a cabin wall (5) of the cabin; A generator (6) is arranged inside the nacelle, a generator air outlet (601) is provided on a shell of the generator (6), the generator air outlet (601) is suitable for discharging hot air inside the generator (6), and the hot air discharged from the generator air outlet (601) flows along a first direction; A muffler (1) is fixedly arranged relative to the generator (6), the muffler (1) comprising an outer shell (110) and a plurality of muffler sheets (120) arranged inside the outer shell (110), the outer shell (110) having a first air inlet port (101) and a first air outlet port (102) arranged relatively to each other, the first air inlet port (101) being arranged toward the generator air outlet (601), the first air outlet port (102) being arranged toward the cabin air outlet (501), the projection of the first air inlet port (101) on the plane where the first air outlet port (102) is located partially overlapping with the first air outlet port (102), the muffler sheet (120) extending along a second direction, the plurality of muffler sheets (120) being distributed at intervals, wherein the second direction is parallel to the first direction.

2. The noise reduction structure of a wind turbine according to claim 1, characterized in that: The housing (110) comprises a top wall (111), a bottom wall, and two side walls (112) connected between the top wall (111) and the bottom wall, wherein the side walls (112) extend along a third direction, wherein the third direction is parallel to the first direction and the second direction.

3. The noise reduction structure of a wind turbine according to claim 2, characterized in that: The first air inlet port (101) is rectangular, the long side of the rectangle extends along a fourth direction, a plurality of the sound-absorbing sheets (120) are arranged at intervals along the fourth direction, the distance between two adjacent sound-absorbing sheets (120) along the fourth direction is L, the vertical distance between the first air inlet port (101) and the first air outlet port (102) is H, the side wall (112) is connected to the short side of the rectangle, the inclination angle of the side wall (112) relative to the plane where the first air inlet port (101) is located is α, wherein L, H, and α satisfy the relationship: α=arctan(L / H).

4. The noise reduction structure of a wind turbine according to claim 1, characterized in that: A partition cavity (130) is formed between two adjacent sound-absorbing sheets (120), and the orthographic projection of each sound-absorbing sheet (120) on the plane where the first air inlet port (101) is located at least covers an opening area of ​​one partition cavity (130).

5. The noise reduction structure of a wind turbine according to claim 1, characterized in that: The sound-absorbing sheet (120) comprises a head portion (121) close to the first air inlet port (101) and a tail portion (122) close to the first air outlet port (102); The head portion (121) is provided with a first air guide surface (123) arranged at an acute angle to the second direction, and the number of the first air guide surfaces (123) on each of the muffler sheets (120) is two, and the two first air guide surfaces (123) are symmetrically arranged on both sides of the muffler sheet (120) along the thickness direction of the muffler sheet (120); and / or the tail portion (122) is provided with a second air guide surface (124) arranged at an acute angle to the second direction, and the number of the second air guide surfaces (124) on each of the muffler sheets (120) is two, and the two second air guide surfaces (124) are symmetrically arranged on both sides of the muffler sheet (120) along the thickness direction of the muffler sheet (120).

6. The noise reduction structure of a wind turbine according to claim 1, characterized in that: The muffler sheet (120) has a head portion (121) close to the first air inlet port (101) and a tail portion (122) close to the first air outlet port (102); the head portion (121) is configured as a rounded corner, and / or the tail portion (122) is configured as a rounded corner.

7. The noise reduction structure of a wind turbine according to any one of claims 1 to 6, characterized in that: The noise reduction structure of the wind turbine generator set further comprises: a ventilation duct (2), the ventilation duct (2) having a second air inlet port (201) and a second air outlet port (202) arranged opposite to each other, the second air inlet port (201) being connected to the first air outlet port (102), and the second air outlet port (202) being connected to the cabin air outlet (501) so as to connect the first air outlet port (102) with the cabin air outlet (501).

8. The noise reduction structure of a wind turbine according to claim 7, characterized in that: The ventilation tube (2) is a soft tube, and the material of the ventilation tube (2) includes sound-absorbing material.

9. The noise reduction structure of a wind turbine according to claim 7, characterized in that: The noise reduction structure of the wind turbine generator set further comprises: an elbow (3), the elbow (3) having a third air inlet port (301) and a third air outlet port (302) arranged opposite to each other, the third air inlet port (301) being connected to the second air outlet port (202) and the nacelle air outlet (501), and the elbow (3) being arranged on the outside of the nacelle, and the third air outlet port (302) opening downward.

10. The noise reduction structure of a wind turbine according to claim 9, characterized in that: The silencer (1) is detachably connected to the ventilator (2), the ventilator (2) is detachably connected to the cabin wall (5), and the elbow (3) is detachably connected to the cabin wall (5).

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