A wind turbine nacelle exhaust silencer

Abstract

The present application relates to exhaust silencing technical field, disclose a kind of wind power nacelle exhaust silencer, including mutually conducting exhaust pipe and silencer pipe, the inside of the exhaust pipe is provided with the exhaust fan of driving gas moves towards the direction of silencer pipe, the inside of silencer pipe is provided with multiple groups of synchronous rotation sound absorption components, gap is provided for gas flow between adjacent two groups of sound absorption components, the plane of sound absorption component and airflow direction form acute angle angle;The sound absorption component includes first rotating frame and second rotating frame sequentially arranged along airflow direction and mutually hinged, and the side of first rotating frame and second rotating frame and airflow contact is provided with sound absorption panel.The present application is by being provided with angle adjusting component, dynamically adjusts the included angle between first rotating frame and second rotating frame in silencer pipe, and the speed of linkage control of exhaust fan is carried out, so that silencer can be according to the actual thermal load of wind power nacelle, adaptively optimizes silencing performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exhaust muffling, and particularly relates to a wind turbine nacelle exhaust muffler. BACKGROUND

[0002] The single capacity of modern wind turbines has generally reached the order of magnitude of several megawatts, which means that the core components in the nacelle, such as the generator, the gear box, the converter and the like, will generate extremely significant heat load in the running process. In order to ensure that these expensive devices are stably and reliably operated in an appropriate temperature range and prolong their service life, modern wind turbine nacelles are generally equipped with forced ventilation cooling systems. The system is usually composed of high-power axial or centrifugal ventilation fans, which timely discharge the accumulated heat in the nacelle through the exhaust port by generating strong air flow. However, this heat dissipation process is accompanied by strong aerodynamic noise, which has a wide frequency spectrum and high sound pressure level, mainly due to the turbulence generated by the disturbance of the fan blades in rotation and the vortex shedding caused by the high-speed airflow through the exhaust louvers. This wideband noise propagates to the far field with the airflow, causing an undeniable impact on the sound environment around the wind farm, and has become one of the key environmental factors restricting the selection of wind farm sites, especially the development of areas close to residential areas.

[0003] At present, in order to deal with the above-mentioned noise problem, the industry generally installs a fixed resistive muffler at the exhaust port of the nacelle. This type of muffler usually adopts the way of setting sound-absorbing sheets or honeycomb sound-absorbing structures inside, and uses the sound energy dissipation characteristics of porous sound-absorbing materials to reduce noise, especially for middle and high frequency noise. However, this fixed structure muffler has a obvious disadvantage: its noise reduction characteristics (such as noise reduction amount and frequency spectrum characteristics) are fixed after design and installation, and cannot be dynamically adjusted. The operating conditions of the wind turbine are directly affected by the change of natural wind speed, and the heat generated in the nacelle and the cooling air required also fluctuate in a large range. Under low wind speed and low load conditions, the heat generated in the nacelle is small, and the required cooling air is also reduced. At this time, if the fixed muffler is still operated in the maximum noise reduction state, unnecessary and excessive air flow resistance will be generated due to the inherent design of the air flow channel, which increases the energy consumption of the ventilation fan and reduces the overall energy efficiency of the cooling system. On the contrary, in some transient high heat conditions, the fixed noise reduction performance may not be sufficient to achieve optimal noise suppression. Therefore, the fixed muffler in the prior art cannot achieve the best balance between noise control efficiency and system operation energy efficiency in the entire wind turbine operating range, and lacks the ability to adaptively adjust according to the actual operating conditions, which needs to be improved. SUMMARY

[0004] The present application provides a wind turbine nacelle exhaust muffler, which solves the problems raised in the background art.

[0005] To achieve the above object, the present application provides the following technical solutions.

[0006] The wind turbine nacelle exhaust silencer comprises an exhaust pipe and a silencer pipe which are in communication with each other, the inside of the exhaust pipe is provided with an exhaust fan which drives the gas to move towards the silencer pipe, the inside of the silencer pipe is provided with a plurality of groups of sound-absorbing components which rotate synchronously, a gap for gas flow is arranged between two adjacent groups of sound-absorbing components, and the plane of the sound-absorbing component forms an acute angle with the direction of the airflow; the sound-absorbing component comprises a first rotating frame and a second rotating frame which are arranged in sequence along the direction of the airflow and are hingedly connected with each other, and the side of the first rotating frame and the second rotating frame which is in contact with the airflow is provided with a sound-absorbing plate; and the side wall of the silencer pipe is provided with an included angle adjusting assembly for adjusting the included angle of the first rotating frame and the second rotating frame.

[0007] As a preferred technical solution of the present application, the exhaust pipe is a circular tubular structure, the silencer pipe is a square tubular structure, a communication pipe is connected between the exhaust pipe and the silencer pipe, one end of the communication pipe is provided with a circular interface which is in butt joint with the exhaust pipe, the other end of the communication pipe is provided with a square interface which is in butt joint with the silencer pipe, and the flow cross-sectional area of the exhaust pipe is smaller than that of the silencer pipe.

[0008] As a preferred technical solution of the present application, the silencer pipe comprises a support frame of a cuboid frame structure and a back-to-back-shaped protective shell which is sleeved outside the support frame, the inside of the protective shell is provided with a sound-absorbing plate, the side of the support frame which is close to the exhaust pipe is provided with a suspension rotating assembly for suspending the end of the first rotating frame, and the side of the support frame which is away from the exhaust pipe is provided with a horizontal movement rotating assembly for suspending the end of the second rotating frame. A plurality of through holes are formed in the plate body of the sound-absorbing plate, and the inside of the sound-absorbing plate is filled with sound-absorbing material.

[0009] As a preferred technical solution of the present application, the horizontal movement rotating assembly comprises a first fixed plate which is fixedly connected with the support frame, at least one sliding rod is arranged on the side of the first fixed plate, a sliding seat is slidably connected on the sliding rod, a first rotating seat which is rotatably connected with the side of the second rotating frame is arranged on the side of the sliding seat, a limiting plate is arranged on the end of the sliding rod, a reset spring which is sleeved outside the sliding rod is arranged between the limiting plate and the sliding seat, the reset spring is in a compressed state and provides a pre-tightening force to the sliding seat in the direction away from the center of the support frame.

[0010] As a preferred technical solution of the present application, the suspension rotating assembly comprises a second fixed plate which is fixedly connected with the support frame, and a second rotating seat is arranged on the second fixed plate, the second rotating seat is rotatably connected with the side of the first rotating frame.

[0011] As a preferred technical scheme of the present application, the included angle adjusting assembly comprises a suspension frame arranged on the side of the support frame away from the exhaust pipe, the side surface of the suspension frame is provided with a jacking device, the extending end of the jacking device is connected to one end of a push plate, the other end of the push plate is provided with a jack rod, the end of the jack rod is provided with a top head for abutting against the second rotating frame, and the middle part of the suspension frame is provided with a guide rod, the middle part of the guide rod is slidingly connected to the middle part of the push plate.

[0012] As a preferred technical scheme of the present application, the first rotating frame and the second rotating frame are hingedly connected through an inner hinge, the two sides of the gap between the first rotating frame and the second rotating frame are provided with elastic transition strips, and the side surfaces of all the first rotating frames are rotationally connected through the same connecting rod.

[0013] The present application has the following advantages:

[0014] By arranging the included angle adjusting assembly, the included angle between the first rotating frame and the second rotating frame in the muffler pipe is dynamically adjusted, and the rotating speed of the exhaust fan is linked and controlled, so that the muffler can adaptively optimize the muffling performance under the premise of ensuring sufficient heat dissipation and exhaust, effectively solves the contradiction that the fixed muffler cannot balance the energy efficiency and noise control under variable working conditions, and significantly improves the environmental friendliness and economy of the wind turbine operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a structural schematic view of a wind turbine nacelle exhaust muffler.

[0017] Figure 2 It is an explosion view of a wind turbine nacelle exhaust muffler.

[0018] Figure 3 It is a structural schematic view of an exhaust pipe in a wind turbine nacelle exhaust muffler.

[0019] Figure 4 It is a structural schematic view of a communication pipe in a wind turbine nacelle exhaust muffler.

[0020] Figure 5 It is a structural schematic view of a muffler pipe in a wind turbine nacelle exhaust muffler.

[0021] Figure 6 It is a structural schematic view of the inside of a muffler pipe in a wind turbine nacelle exhaust muffler.

[0022] Figure 7 It is a schematic view of the structure of the first rotating frame and the second rotating frame in a wind turbine nacelle exhaust muffler.

[0023] Figure 8 It is Figure 7 A partial enlarged view of the middle A.

[0024] Figure 9 It is Figure 7 A partial enlarged view of the middle B.

[0025] Figure 10 It is a schematic view of the structure of the angle adjusting assembly in a wind turbine nacelle exhaust muffler.

[0026] Figure 11 It is a schematic view of the structure of the elastic transition strip in a wind turbine nacelle exhaust muffler.

[0027] In the figure: 1, exhaust pipe; 2, communication pipe; 3, muffler pipe; 4, exhaust fan; 5, angle adjusting assembly; 6, through hole; 7, support frame; 8, protective shell; 9, sound absorption board; 10, first rotating frame; 11, second rotating frame; 12, sound absorption assembly; 13, top head; 14, top rod; 15, push plate; 16, guide rod; 17, suspension frame; 18, jacking device; 19, first fixed plate; 20, sliding rod; 21, sliding seat; 22, first rotating seat; 23, return spring; 24, limiting plate; 25, horizontal moving rotating assembly; 26, triangular guide plate; 27, second fixed plate; 28, second rotating seat; 29, suspension rotating assembly; 30, inner hinge; 31, elastic transition strip; 32, connecting rod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] In one embodiment, please refer to Figures 1-4The application discloses a wind turbine nacelle exhaust muffler, which comprises an exhaust pipe 1 and a muffling pipe 3 which are communicated with each other. The exhaust pipe 1 is a circular pipe structure, and a driving air fan 4 is arranged in the exhaust pipe 1 to drive air to move towards the muffling pipe 3. In the drawings, only the effect of air flowing to the right is shown. The muffling pipe 3 is a square pipe structure. The exhaust pipe 1 and the muffling pipe 3 are connected through a communication pipe 2. One end of the communication pipe 2 is a circular interface matched with the exhaust pipe 1, and the other end is a square interface matched with the muffling pipe 3, so as to realize smooth transition from a circular cross section to a square cross section. The flow cross section area of the exhaust pipe 1 is designed to be smaller than that of the muffling pipe 3. The exhaust pipe 1, the communication pipe 2 and the muffling pipe 3 are sequentially arranged from left to right. The exhaust pipe 1 is a square pipe structure which is communicated from left to right, and flanges are welded at the left and right ends of the exhaust pipe 1. The flange on the left is used for fixing the whole muffler to an exhaust port of a wind turbine nacelle. The left and right ends of the communication pipe 2 are also provided with connecting flanges. The communication pipe 2 is processed by casting or stamping process, so that the inner wall of the communication pipe 2 is smooth, and air can flow smoothly. The exhaust pipe 1 adopts a circular structure to facilitate the installation of the driving air fan 4, and the muffling pipe 3 adopts a square structure to facilitate the arrangement and installation of internal muffling devices. After air enters the muffling pipe 3 with a larger cross section from the exhaust pipe 1 with a smaller cross section, the flow rate of the air is reduced, which helps to reduce air flow noise and realize preliminary muffling.

[0030] In one case of the embodiment, please refer to Figure 5 、 Figure 6 、 Figure 7 and Figure 11The sound-absorbing pipe 3 is internally provided with a plurality of groups of sound-absorbing components 12 which can rotate synchronously, arranged in sequence from front to back. Adjacent sound-absorbing components 12 are provided with gaps for airflow to pass through, and the included angle between each sound-absorbing component 12 and the airflow direction is an acute angle. This design makes the airflow deflect when flowing through, but due to the small included angle, the channel is not significantly blocked, and the sound-absorbing pipe 3 can always be in a smooth state. Each group of sound-absorbing components 12 includes a first rotating frame 10 and a second rotating frame 11 which are connected to each other by an internal hinge 30. Vertical elastic transition strips 31 are arranged on the front and back sides of the gap between the first rotating frame 10 and the second rotating frame 11. The left side of the elastic transition strip 31 is connected to the right side of the first rotating frame 10, and the right side of the elastic transition strip 31 is connected to the left side of the second rotating frame 11, thereby effectively shielding the gap and guiding the airflow to smoothly transition from the surface of the first rotating frame 10 to the surface of the second rotating frame 11. The elastic transition strip 31 is made of rubber material and can adaptively deform when the first rotating frame 10 and the second rotating frame 11 rotate relative to each other, continuously maintaining the shielding effect on the gap. The first rotating frame 10 and the second rotating frame 11 are both back-shaped frame structures, and a sound-absorbing plate 9 is clamped inside, and the core sound-absorbing function is realized by the sound-absorbing plate 9. An included angle adjusting component 5 is arranged on the right side of the lower surface of the sound-absorbing pipe 3, used to adjust the included angle between the first rotating frame 10 and the second rotating frame 11. When the included angle increases, the reflection path of sound waves between the sound-absorbing components 12 increases, and the reflection times increase, thereby enhancing the sound-absorbing effect, but the airflow resistance also increases accordingly; on the contrary, when the included angle decreases, the airflow resistance decreases, which is beneficial to exhaust. The upper sides of all first rotating frames 10 are connected by a front-to-back connecting rod 32, ensuring that they can rotate synchronously.

[0031] In one case of the present embodiment, please refer to Figures 5-9 The main body of the sound-absorbing pipe 3 includes a support frame 7 of a cubic frame structure. A protective shell 8 of a back-shaped structure is sleeved outside the support frame 7, and the protective shell 8 is made of a metal plate. During assembly, the support frame 7 welded with angle steel is first used as a skeleton to fix the internal sound-absorbing components 12, and the sound-absorbing plates 9 are installed on the front and back and upper and lower inner side walls of the support frame 7, and the sound-absorbing plates 9 are fixed at the corners by bolts. Then the protective shell 8 is sleeved into the support frame 7 from the right side, and is fixed by bolts. Suspension rotating components 29 are arranged on the upper and lower sides of the left end of the support frame 7, used to connect the upper and lower sides of the left end of the first rotating frame 10; and horizontal moving rotating components 25 are arranged on the upper and lower sides of the right end of the support frame 7, used to connect the upper and lower sides of the right end of the second rotating frame 11. This makes the first rotating frame 10 and the second rotating frame 11 movably suspended inside the support frame 7, without affecting the normal flow of airflow. The side walls of the sound-absorbing plate 9 are provided with a plurality of through holes 6, which are filled with sound-absorbing materials such as glass wool. The through hole 6 structure can increase the reflection and interference of sound waves, and promote the sound waves to be consumed inside the material, thereby improving the sound-absorbing effect.

[0032] In one case of the embodiment, please refer to Figures 5-9 The horizontal moving and rotating assembly 25 comprises a first fixed plate 19 fixed to the right end of the support frame 7 in the front-rear direction. The left side of the first fixed plate 19 is provided with a sliding rod 20 in the left-right direction at each of the front and rear ends. The sliding rod 20 is sleeved with a sliding seat 21 which can slide, and the side of the sliding seat 21 is provided with a first rotating seat 22 which is rotatably connected with the side of the second rotating frame 11. The left end of the sliding rod 20 is provided with a limiting plate 24, and a return spring 23 sleeved with the sliding rod 20 is arranged between the limiting plate 24 and the sliding seat 21. The return spring 23 is in a compressed state, and the elastic force of the return spring 23 promotes the right movement of the sliding seat 21, so that the first rotating frame 10 and the second rotating frame 11 tend to keep flush without external force. The hanging rotating assembly 29 comprises a second fixed plate 27 fixed to the left end of the support frame 7 in the left-right direction, and the right end of the second fixed plate 27 is provided with a second rotating seat 28 which is rotatably connected with the side of the first rotating frame 10. Through the cooperation of the horizontal moving and rotating assembly 25 and the hanging rotating assembly 29, the stable support and flexible rotation of the sound absorbing assembly 12 are realized.

[0033] In one case of the embodiment, please refer to Figure 5 and Figure 10The angle-adjusting assembly 5 comprises a suspension frame 17 arranged at the right end below the support frame 7. A left-right oriented guide rod 16 is fixed to the right side of the suspension frame 17, and a vertically arranged push plate 15 is slidably connected to the guide rod 16. A jacking device 18, such as a pneumatic cylinder or an electric push rod, is installed below the suspension frame 17, and the extending end of the jacking device 18 is connected to the lower end of the push plate 15, for driving the push plate 15 to move left and right along the guide rod 16. A left-right oriented jacking rod 14 is arranged at the left side of the upper end of the push plate 15, and a jacking head 13 is arranged at the left end of the jacking rod 14. When the jacking device 18 drives the push plate 15 to move left, the jacking head 13 abuts against and pushes the right side of the second rotating frame 11, so that the first rotating frame 10 and the second rotating frame 11 are forced to relatively rotate, and the included angle is increased. When the jacking head 13 is not in contact with the second rotating frame 11, the first rotating frame 10 and the second rotating frame 11 are reset to a smaller initial included angle under the action of a reset spring 23. Even if the reset spring 23 is not installed, the first rotating frame 10 and the second rotating frame 11 will also relatively rotate under the action of the airflow itself. However, the first rotating frame and the second rotating frame always maintain a minimum included angle and will not be completely flush. This design maintains the basic sound-absorbing effect, and avoids the jacking head 13 from being stuck when the sound-absorbing assembly 12 is completely flush. The jacking head 13 is located at the right side of the second rotating frame 11, and will not interfere with the airflow, and is made of rubber material to absorb part of the vibration. A triangular flow guide plate 26 is arranged at the left side of the first rotating frame 10, and the upper and lower ends of the flow guide plate 26 are fixed to the upper and lower second fixed plates 27, respectively, for smoothly guiding the airflow entering the muffler pipe 3 to the sound-absorbing plates 9 on both sides.

[0034] In the implementation process of the embodiment, first, the horizontal-moving rotating assembly 25 and the suspension rotating assembly 29 are respectively installed at the left and right sides of the support frame 7. The sound-absorbing assembly 12 with the sound-absorbing plates 9 installed is placed inside the support frame 7, and the sound-absorbing plates 9 are installed on the inner side wall of the support frame 7. Then, the protective shell 8 is put on and fixed, and finally the angle-adjusting assembly 5 is installed. The exhaust pipe 1 is installed at the air outlet of the wind turbine nacelle, and the exhaust pipe 1 is sequentially connected with the communication pipe 2 and the muffler pipe 3.

[0035] The temperature control device is arranged in the wind turbine nacelle, and is electrically connected with the exhaust fan 4 and the controller of the jacking device 18 in the angle adjusting assembly 5. When the heat generation in the wind turbine nacelle is large, the rotating speed of the exhaust fan 4 is increased to enhance the exhaust. Meanwhile, the controller instructs the jacking device 18 to drive the top head 13 to move right, so as to reduce the angle between the first rotating frame 10 and the second rotating frame 11, thereby reducing the airflow passing resistance and ensuring the heat dissipation efficiency. When the heat generation in the wind turbine nacelle is small, the rotating speed of the exhaust fan 4 is reduced, and the self-running noise is reduced. Meanwhile, the controller instructs the jacking device 18 to drive the top head 13 to move left, so as to increase the angle between the first rotating frame 10 and the second rotating frame 11, prolong the sound wave reflection path, and enhance the noise reduction effect, so as to adapt to the low noise operation requirement.

[0036] The wind turbine nacelle exhaust silencer is provided with the angle adjusting assembly 5, the angle between the first rotating frame 10 and the second rotating frame 11 in the silencing pipe 3 is dynamically adjusted, and the rotating speed of the exhaust fan 4 is linkage controlled, so that the silencer can adaptively optimize the silencing performance under the premise of ensuring sufficient heat dissipation and exhaust, according to the actual heat load of the wind turbine nacelle, the contradiction that the fixed silencer cannot simultaneously consider the energy efficiency and noise control under the variable working condition is effectively solved, and the environmental friendliness and economy of the wind turbine operation are significantly improved.

[0037] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application.

Claims

1. A wind turbine nacelle exhaust silencer, comprising an exhaust pipe and a silencer pipe that are interconnected, wherein an exhaust fan is disposed inside the exhaust pipe to drive the gas to move toward the silencer pipe, characterized in that, The silencer is equipped with multiple sets of synchronously rotating sound-absorbing components inside. There is a gap between two adjacent sets of sound-absorbing components to allow gas flow. The plane of the sound-absorbing component forms an acute angle with the airflow direction. The sound-absorbing component includes a first rotating frame and a second rotating frame that are arranged sequentially along the airflow direction and hinged to each other. The sides of the first rotating frame and the second rotating frame that are in contact with the airflow are provided with sound-absorbing panels. The side wall of the silencer is provided with an angle adjustment component for adjusting the angle between the first rotating frame and the second rotating frame. The silencer includes a cubic frame support frame and a U-shaped protective shell fitted over the outside of the support frame. A sound-absorbing panel is installed inside the protective shell. A suspension rotation assembly for suspending the end of a first rotating frame is located on the side of the support frame near the exhaust pipe, and a lateral rotation assembly for suspending the end of a second rotating frame is located on the side of the support frame away from the exhaust pipe. The lateral rotation assembly includes a first fixing plate fixedly connected to the support frame. At least one sliding rod is provided on the side of the first fixing plate, and a sliding seat is slidably connected to the sliding rod. A first rotating seat rotatably connected to the side of the second rotating frame is provided on the side of the sliding seat. A limit plate is provided at the end of the sliding rod, and a sleeve is provided between the limit plate and the sliding seat. A return spring is provided outside the sliding rod. The return spring is in a compressed state and provides a preload force to the sliding seat in a direction away from the center of the support frame. The suspension rotation assembly includes a second fixed plate fixedly connected to the support frame. A second rotating seat is provided on the second fixed plate. The second rotating seat is rotatably connected to the side of the first rotating frame. The included angle adjustment assembly includes a suspension frame provided on the side of the support frame away from the exhaust pipe. A lifting device is provided on the side of the suspension frame. The extended end of the lifting device is connected to one end of the push plate. A top rod is provided at the other end of the push plate. The end of the top rod is provided with a top head for abutting against the second rotating frame. A guide rod is provided in the middle of the suspension frame. The middle of the guide rod is slidably connected to the middle of the push plate.

2. The wind turbine nacelle exhaust silencer according to claim 1, characterized in that, The exhaust pipe is a circular tubular structure, and the muffler is a square tubular structure. A connecting pipe connects the exhaust pipe and the muffler. One end of the connecting pipe has a circular interface that connects to the exhaust pipe, and the other end of the connecting pipe has a square interface that connects to the square pipe. The flow cross-sectional area of ​​the exhaust pipe is smaller than that of the muffler.

3. A wind turbine nacelle exhaust silencer according to claim 1, characterized in that, The sound-absorbing panel has several through holes, and the interior of the sound-absorbing panel is filled with sound-absorbing material.

4. A wind turbine nacelle exhaust silencer according to claim 1, characterized in that, The first rotating frame and the second rotating frame are hinged to each other by an inner hinge. Elastic transition strips are provided on both sides of the gap between the first rotating frame and the second rotating frame. All the sides of the first rotating frame are rotatably connected by the same connecting rod.

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