Silencing device for gas turbine intake system

Abstract

This invention relates to the field of gas turbine technology, and more particularly to a silencing device for a gas turbine intake system. The device includes an internal pipe, a middle pipe, and an external pipe arranged sequentially from the inside out. The internal pipe forms an intake channel through which the intake channel is axially connected. A silencing plate is installed within the internal pipe to divide the intake channel into multiple ventilation channels. A sound-absorbing layer is provided between the internal and middle pipes, and this layer has multiple silencing cavities with smaller inner and outer sides and a larger middle cavity. A sound-insulating layer is provided between the middle and external pipes, and this layer has multiple sound-insulating cavities. A vibration-damping structure is provided on the outer side of the external pipe to support it. Through the silencing plate, sound-absorbing layer, sound-insulating layer, and vibration-damping structure, continuous four-layer silencing is achieved. This multi-stage silencing effectively widens the noise reduction band, eliminating noise over a wider area. Simultaneously, the multi-stage silencing can progressively weaken the noise intensity, eliminating high-intensity noise and effectively increasing the silencing capacity.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, and in particular to a silencer device for a gas turbine intake system. Background Technology

[0002] With societal development, people have increasingly higher demands for quality of life and working environment. In the gas turbine intake system, not only is stable performance required to provide a continuous supply of dry and clean air for the gas turbine, but also excessive noise is required during the intake process. Excessive noise can affect people's physical and mental health and reduce the work efficiency of employees. Therefore, a series of solutions are needed to reduce the noise impact of the intake system, such as designing specific sound-absorbing structures, using new sound-absorbing materials, or sound-insulating materials.

[0003] A silencer is a device that allows airflow while simultaneously silencing noise. The noise from a gas turbine intake system primarily consists of mechanical vibration and aerodynamic noise. Current technologies most commonly employ resistive silencers within the intake duct and soundproof enclosures to isolate the entire system. However, with technological advancements, the frequency range and intensity of gas turbine intake noise are increasing. Simply adding resistive silencers is no longer sufficient. Furthermore, adding silencers can negatively impact airflow characteristics, increasing intake resistance and affecting gas turbine operating efficiency. Using soundproof enclosures significantly increases equipment size and footprint, raising costs without addressing the noise issue at its source. Therefore, traditional silencers are increasingly failing to meet the noise reduction requirements of gas turbine intakes. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a silencing device for a gas turbine intake system that can improve the silencing amount and has a wider silencing band.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention provides a silencing device for a gas turbine intake system, comprising an internal pipe, a middle pipe, and an external pipe arranged sequentially from the inside out. The internal pipe forms an intake channel through which the intake channel is axially connected, and a silencing plate is provided inside the internal pipe to divide the intake channel into multiple ventilation channels. A sound-absorbing layer is provided between the internal pipe and the middle pipe, and the sound-absorbing layer has multiple silencing cavities with small inner and outer cavities and a large middle cavity. A sound-insulating layer is provided between the middle pipe and the external pipe, and the sound-insulating layer has multiple sound-insulating cavities. A vibration-damping structure is provided on the outside of the external pipe to support the external pipe.

[0007] Preferably, the sound-absorbing plate is a streamlined plate or a pleated straight plate, and the two sides of the pleated straight plate are alternately sunken to form S-shaped pleats.

[0008] Preferably, the sound-absorbing plate has multiple holes.

[0009] Preferably, the sound-absorbing layer includes multiple sound-absorbing elements distributed circumferentially along the internal pipe, with adjacent sound-absorbing elements spaced apart to form a sound-absorbing cavity, and the sound-absorbing elements are made of sound-absorbing material.

[0010] Preferably, the sound-absorbing layer includes a sound-absorbing material layer, which fills the space between the inner side of the sound-absorbing cavity and the internal pipe and / or between the outer side of the sound-absorbing cavity and the central pipe.

[0011] Preferably, the sound insulation layer includes an inner sound insulation board disposed on the outer side of the central pipe, an outer sound insulation board disposed on the inner side of the outer pipe, and a plurality of support members disposed between the inner and outer sound insulation boards and distributed circumferentially along the central pipe, with adjacent support members spaced apart to form a sound insulation cavity.

[0012] Preferably, both the inner and outer sound insulation panels are made of sound insulation materials.

[0013] Preferably, the soundproof cavity is filled with soundproofing material.

[0014] Preferably, the outer surface of the external pipe is covered with a vibration damping layer.

[0015] Preferably, the vibration damping structure includes a base, a support column on the base, a spring, a washer, and a bracket on the support column. The spring elastically presses against the base and the washer. One end of the bracket is movably fitted onto the support column and located on the side of the washer away from the spring. The other end of the bracket supports an external pipe.

[0016] Compared with the prior art, the present invention has significant progress:

[0017] The silencing device for the gas turbine intake system of this invention achieves continuous four-layer silencing through a silencing plate, a sound-absorbing layer, a sound-insulating layer, and a vibration-damping structure. This multi-stage silencing effectively broadens the noise reduction band, eliminating noise over a wider area. Simultaneously, the multi-stage silencing also progressively weakens the noise intensity, eliminating high-intensity noise and effectively increasing the silencing capacity. Therefore, the silencing device for the gas turbine intake system of this invention significantly improves the overall noise reduction effect, greatly reducing the noise of the gas turbine intake system, thereby ensuring a quiet and stable working environment for the gas turbine and protecting the physical and mental health of relevant personnel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one embodiment of the silencing device of the gas turbine intake system according to an embodiment of the present invention. In this embodiment, the silencing plate is a streamlined plate.

[0019] Figure 2This is a schematic diagram of another embodiment of the silencing device of the gas turbine intake system according to an embodiment of the present invention. In this embodiment, the silencing plate is a pleated straight plate.

[0020] Figure 3 yes Figure 2 The diagram shows the structure of the muffler plate in the muffler device of the gas turbine intake system.

[0021] Figure 4 This is a schematic diagram of the vibration reduction structure in the silencer device of the gas turbine intake system according to an embodiment of the present invention.

[0022] The reference numerals in the attached figures are explained as follows:

[0023] 1. Internal piping

[0024] 10. Air intake channel

[0025] 2. Central Pipeline

[0026] 3. External pipes

[0027] 4. Soundproof panel

[0028] 4a Streamlined Panel

[0029] 4b Pleated Straight Plate

[0030] 4b-1 S-shaped folds

[0031] 40, 40a, 40b Pores

[0032] 5 Sound-absorbing layers

[0033] 50 Silencing Cavity

[0034] 51 sound absorbing parts

[0035] 6. Sound insulation layer

[0036] 60 Soundproof cavity

[0037] 61 Inner layer sound insulation panel

[0038] 62 Outer sound insulation panel

[0039] 63 Support components

[0040] 7 Vibration-damping structure

[0041] 71 Base

[0042] 72 Support Columns

[0043] 73 Springs

[0044] 74 gasket

[0045] 75 support Detailed Implementation

[0046] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] like Figures 1 to 4 The diagram illustrates one embodiment of a silencing device for a gas turbine intake system according to the present invention. This embodiment of the silencing device for a gas turbine intake system is used to eliminate and isolate various noises from the gas turbine intake system. The main noises of the gas turbine intake system are aerodynamic noise and vibration noise. By having the air entering the gas turbine intake system flow through the silencing device of this embodiment, the noise can be eliminated and isolated by the silencing device as it propagates through the air.

[0051] See Figure 1 and Figure 2 The silencing device of the gas turbine intake system in this embodiment includes an internal pipe 1, a middle pipe 2 and an external pipe 3 arranged sequentially from the inside to the outside.

[0052] An air intake channel 10 is formed by an axially extending internal duct 1, through which air from the gas turbine intake system passes. The internal duct 1 contains a silencer plate 4 that divides the air intake channel 10 into multiple ventilation channels, and the silencer plate 4 has noise reduction properties. When air enters the air intake channel 10 of the internal duct 1, the silencer plate 4 divides the incoming air into multiple airflows and reduces noise through its own noise reduction properties. This constitutes the first layer of noise reduction in the gas turbine intake system of this embodiment.

[0053] The middle pipe 2 is coaxially sleeved outside the inner pipe 1, forming a space between them. A sound-absorbing layer 5 is provided between the inner pipe 1 and the middle pipe 2. The sound-absorbing layer 5 has multiple silencing cavities 50 with small inner and outer side cavities and a large middle cavity. That is, the inner cavity of the silencing cavity 50 near the inner pipe 1 and the outer cavity near the middle pipe 2 are narrow cavities with relatively small cross-sectional areas, while the middle cavity of the silencing cavity 50 located between its inner and outer cavities is a wide cavity with a relatively large cross-sectional area. Noise that is not eliminated by the first layer of silencing enters the sound-absorbing layer 5. In the sound-absorbing layer 5, the acoustic impedance will change due to the change in the cross-sectional area of ​​the silencing cavity 50. When the sound wave reaches the wide cavity from the narrow cavity, part of the energy will be reflected back to the air inlet, thus achieving the purpose of consuming sound energy. This is the second layer of silencing of the gas turbine intake system in this embodiment.

[0054] The outer pipe 3 is coaxially sleeved outside the middle pipe 2, forming a gap between them. A sound insulation layer 6 is provided between the middle pipe 2 and the outer pipe 3. The sound insulation layer 6 has multiple sound insulation cavities 60, which provide sound insulation. The sound energy not consumed by the second layer of silencing enters the sound insulation layer 6 and is consumed through the sound insulation cavities 60. This is the third layer of silencing in the silencing device of the gas turbine intake system in this embodiment.

[0055] The outer side of the external pipe 3 is provided with a vibration damping structure 7 to support the external pipe 3. When air enters the silencer of the gas turbine intake system in this embodiment, the silencer will vibrate. This vibration can be reduced by the vibration damping structure 7, thereby reducing vibration noise. This is the fourth layer of silencer of the gas turbine intake system in this embodiment.

[0056] Therefore, the silencing device of the gas turbine intake system in this embodiment achieves continuous four-layer silencing through the silencing plate 4, sound-absorbing layer 5, sound-insulating layer 6, and vibration-damping structure 7. Multi-stage silencing effectively broadens the noise reduction band, eliminating noise over a wider area. Simultaneously, multi-stage silencing can progressively weaken the noise intensity, eliminating high-intensity noise and effectively increasing the silencing amount. Therefore, the silencing device of the gas turbine intake system in this embodiment can significantly improve the overall noise reduction effect, greatly reducing the noise of the gas turbine intake system, thereby ensuring a quiet and stable working environment for the gas turbine and protecting the physical and mental health of relevant personnel.

[0057] In this embodiment, multiple sound-absorbing plates 4 are provided inside the internal pipe 1. Each sound-absorbing plate 4 is arranged radially along the internal pipe 1, and the multiple sound-absorbing plates 4 are distributed in a circular array with the center of the internal pipe 1 as the center. The number of sound-absorbing plates 4 is not limited and can be increased or decreased according to the actual application needs.

[0058] Preferably, the sound-absorbing plate 4 is provided with a plurality of holes 40. The holes 40 can increase the contact area between the sound-absorbing plate 4 and the noise, thereby increasing the noise reduction. At the same time, it can also reduce the air resistance, thereby better maintaining airflow and minimizing the impact of the sound-absorbing plate 4 on airflow. In this embodiment, the shape of the holes 40 is not limited and can be quadrilateral, hexagonal, circular, or other shapes.

[0059] See Figure 1 In a preferred embodiment, the sound-absorbing plate 4 is a streamlined plate 4a. The streamlined plate 4a ensures that the airflow resistance when passing through the air intake channel 10 is not too high, and also reduces the noise generated when the airflow impacts the sound-absorbing plate 4. The streamlined plate 4a has multiple pores 40a to enhance the sound absorption effect and further reduce airflow resistance.

[0060] See Figure 2 and Figure 3 In another preferred embodiment, the sound-absorbing plate 4 is a pleated straight plate 4b. The two sides of the pleated straight plate 4b are alternately recessed to form S-shaped pleats 4b-1. These S-shaped pleats 4b-1 give the pleated straight plate 4b a large sound-absorbing contact area. Noise waves, after contacting the pleated straight plate 4b, can repeatedly reflect and dissipate energy within the S-shaped pleats 4b-1, achieving a good sound-absorbing effect. Preferably, the pleated straight plate 4b can have multiple layers of S-shaped pleats 4b-1 to enhance the sound-absorbing effect. Multiple pores 40b are formed on the pleated straight plate 4b to enhance the sound absorption effect and reduce air resistance.

[0061] In this embodiment, see Figure 1 and Figure 2Preferably, the sound-absorbing layer 5 includes a plurality of sound-absorbing elements 51 distributed circumferentially along the internal pipe 1, with adjacent sound-absorbing elements 51 spaced apart to form a sound-absorbing cavity 50. The sound-absorbing elements 51 are made of sound-absorbing material, which can be a conventional sound-absorbing material. The sound-absorbing elements 51 can absorb noise reflected and refracted in the sound-absorbing cavity 50, so the sound energy that is not consumed by the sound-absorbing cavity 50 after entering the sound-absorbing layer 5 can be absorbed by the sound-absorbing elements 51. Thus, the sound-absorbing layer 5 achieves a good sound absorption effect by mixing and absorbing noise through the sound-absorbing cavity 50 and the sound-absorbing elements 51.

[0062] Furthermore, the sound-absorbing layer 5 may also include a sound-absorbing material layer. The sound-absorbing material layer is made of porous sound-absorbing material. The sound-absorbing material layer fills the space between the inner side of the silencing cavity 50 and the inner pipe 1 and / or the outer side of the silencing cavity 50 and the middle pipe 2, which can further consume the sound energy that has not been consumed, and increase the sound absorption volume while widening the sound absorption frequency.

[0063] In this embodiment, see Figure 1 and Figure 2 Preferably, the sound insulation layer 6 includes an inner sound insulation panel 61 disposed on the outer side of the central pipe 2, an outer sound insulation panel 62 disposed on the inner side of the outer pipe 3, and a plurality of support members 63 disposed between the inner sound insulation panel 61 and the outer sound insulation panel 62 and distributed circumferentially along the central pipe 2, with adjacent support members 63 spaced apart to form a sound insulation cavity 60. Noise entering the sound insulation layer 6 passes through the inner sound insulation panel 61 and enters the sound insulation cavity 60. The inner sound insulation panel 61 first performs the sound insulation effect, and the noise that is not blocked enters the sound insulation cavity 60. The noise vibration amplitude is reduced by the reflection and resonance of the outer sound insulation panel 62, thereby making the sound insulation effect of the outer sound insulation panel 62 better. Preferably, both the inner sound insulation panel 61 and the outer sound insulation panel 62 are made of sound insulation material, such as sound insulation steel plate. Preferably, the support members 63 are made of supporting steel frames.

[0064] Furthermore, the sound insulation cavity 60 is filled with sound insulation materials, such as glass wool, which can further improve the sound insulation effect.

[0065] In this embodiment, preferably, a vibration-damping layer is wrapped around the outer surface of the outer pipe 3. The vibration-damping layer is made of vibration-damping material, such as rubber. Wrapping the outer pipe 3 with vibration-damping material helps to reduce vibration noise.

[0066] In this embodiment, see Figure 1 , Figure 2 and Figure 4Preferably, the vibration damping structure 7 includes a base 71, a support column 72 on the base 71, a spring 73, a washer 74, and a bracket 75 fitted on the support column 72. The spring 73 elastically presses against the base 71 and the washer 74. One end of the bracket 75 is movably fitted onto the support column 72 and located on the side of the washer 74 away from the spring 73. The other end of the bracket 75 supports the external pipe 3. The vibration of the silencer caused by air entering the gas turbine intake system of this embodiment first propagates to the bracket 75 of the vibration damping structure 7, and then contacts the washer 74 and the spring 73. The elasticity of the spring 73 relieves the force, effectively reducing the vibration amplitude of the silencer and thus reducing the noise. Preferably, the bracket 75 of the vibration damping structure 7 is made of a vibration damping material, such as rubber, which can further reduce mechanical vibration.

[0067] In this embodiment, multiple vibration damping structures 7 can be provided, such as... Figure 1 and Figure 2 The three shown in the figure are supported by multiple vibration damping structures 7, which can ensure stable support and enhance the vibration damping and noise reduction effect.

[0068] In summary, the working principle of the silencer device for the gas turbine intake system in this embodiment is as follows: When the air entering the gas turbine intake system flows through the silencer device, noise propagates along with the air. When the air enters the intake channel 10 of the internal pipe 1 of the silencer device, the silencer plate 4 divides the incoming air into multiple airflows, causing the sound waves to propagate divergently. The noise is silenced by the silencer plate 4's own silencing performance. The pores 40 on the silencer plate 4 can significantly increase the contact area for absorbing sound waves, and the streamlined plate 4a or the pleated straight plate 4b can allow the airflow to pass smoothly, effectively reducing air resistance. The first layer of noise reduction: Noise not eliminated by the first layer enters the sound-absorbing layer 5. When the noise waves pass through the sound-absorbing cavity 50, which has a small inner and outer cavity and a large middle cavity, part of the energy is reflected back to the air inlet and consumed. The remaining sound energy is absorbed and consumed by the sound-absorbing components 51 and the sound-absorbing material layer of the sound-absorbing layer 5. This is the second layer of noise reduction. The sound energy not consumed by the second layer of noise reduction enters the sound insulation layer 6 and is consumed by the inner sound insulation board 61, the sound insulation cavity 60, and the outer sound insulation board 62. This is the third layer of noise reduction. The vibration noise of the noise reduction device is weakened by the vibration damping layer wrapped on the outer surface of the outer pipe 3 and the spring 73 of the vibration damping structure 7. This is the fourth layer of noise reduction. The noise reduction device of the gas turbine intake system in this embodiment reduces the energy of noise step by step through four consecutive layers of noise reduction. The noise reduction band is wider, the noise reduction is greater, and it can have a lower impact on the airflow and reduce the airflow resistance.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A sound attenuation device for a gas turbine air intake system, characterised in that, The sound-absorbing pipe comprises an inner pipe (1), a middle pipe (2) and an outer pipe (3) which are sequentially sleeved from inside to outside, an air inlet channel (10) is formed through the inner pipe (1) along the axial direction, and a sound-absorbing plate (4) is arranged in the inner pipe (1) to divide the air inlet channel (10) into multiple air passage channels; a sound-absorbing layer (5) is arranged between the inner pipe (1) and the middle pipe (2), the sound-absorbing layer (5) is provided with multiple sound-absorbing cavities (50) with small inner and outer cavities and large middle cavities, the sound-absorbing layer (5) comprises multiple sound-absorbing members (51) which are distributed along the circumferential direction of the inner pipe (1), the sound-absorbing cavities (50) are formed between adjacent sound-absorbing members (51), the sound-absorbing members (51) are made of sound-absorbing material, the sound-absorbing layer (5) comprises a sound-absorbing material layer which is filled between the inner side of the sound-absorbing cavities (50) and the inner pipe (1) and / or between the outer side of the sound-absorbing cavities (50) and the middle pipe (2); a sound-insulating layer (6) is arranged between the middle pipe (2) and the outer pipe (3), the sound-insulating layer (6) is provided with multiple sound-insulating cavities (60); the outer side of the outer pipe (3) is provided with a damping structure (7) for supporting the outer pipe (3).

2. The sound attenuation device of a gas turbine air intake system according to claim 1, characterized in that, The sound-absorbing plate (4) is a streamline plate (4a) or a corrugated straight plate (4b), and S-shaped corrugations (4b-1) are alternately formed on the two side surfaces of the corrugated straight plate (4b).

3. The sound attenuation device of a gas turbine air intake system according to claim 1, characterized in that, Multiple apertures (40) are arranged on the sound-absorbing plate (4).

4. The sound attenuation device of a gas turbine air intake system according to claim 1, characterized in that, The sound-insulating layer (6) comprises an inner sound-insulating plate (61) arranged on the outer side surface of the middle pipe (2), an outer sound-insulating plate (62) arranged on the inner side surface of the outer pipe (3) and multiple support members (63) arranged between the inner sound-insulating plate (61) and the outer sound-insulating plate (62) and distributed along the circumferential direction of the middle pipe (2), and the sound-insulating cavities (60) are formed between adjacent support members (63).

5. The sound attenuation device of a gas turbine air intake system according to claim 4, characterised in that, The inner sound-insulating plate (61) and the outer sound-insulating plate (62) are made of sound-insulating plate material.

6. The sound attenuation device of a gas turbine air intake system according to claim 1, characterized in that, The sound-insulating cavities (60) are filled with sound-insulating material.

7. The sound attenuation device of a gas turbine air intake system according to claim 1, characterized in that, The outer side surface of the outer pipe (3) is wrapped with a damping layer.

8. The sound attenuation device of a gas turbine air intake system of claim 1, wherein, The damping structure (7) comprises a base (71), a support column (72) is arranged on the base (71), a spring (73), a gasket (74) and a bracket (75) are sleeved on the support column (72), the spring (73) is elastically pressed between the base (71) and the gasket (74), one end of the bracket (75) is movably sleeved on the support column (72) and located on the side of the gasket (74) away from the spring (73), and the other end of the bracket (75) supports the outer pipe (3).

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