Silencing device and silencing tower

Abstract

This application discloses a silencing device and a silencing tower. The silencing device includes a main body and an evacuation duct disposed inside the main body. The evacuation duct has an inverted frustum shape from top to bottom, the bottom of the evacuation duct is closed, and the top surface is provided with a plurality of first evacuation holes. The silencing device of this application, by providing an evacuation duct inside the silencing device body and having first evacuation holes at the top, allows hydrogen gas entering the silencing device to be discharged through the evacuation duct, preventing hydrogen gas from accumulating inside the silencing device and enabling rapid hydrogen gas discharge. Secondly, the inverted frustum shape of the evacuation duct effectively increases the exhaust area, further improving the hydrogen gas discharge speed. Therefore, the silencing device can be used in hydrogen environments while ensuring silencing effect.

Description

Technical Field

[0001] This application relates to the field of noise reduction for test bench air intake, and more specifically, to a silencing device and a silencing tower. Background Technology

[0002] When large power equipment such as aircraft engines and gas turbines are tested on the test stand, they generate strong aerodynamic noise during operation, which affects the environment and equipment safety. Therefore, silencers are usually installed in the intake system to reduce noise.

[0003] Currently, most noise reduction devices employ resistive noise reduction structures composed of porous sound-absorbing materials such as glass wool and slag wool. These structures convert sound energy into heat energy through adhesion and internal friction to achieve noise reduction. However, in hydrogen-powered environments or when hydrogen is used as a raw material, these porous structures pose significant safety hazards: hydrogen molecules are small and highly permeable, easily accumulating in the material's pores; furthermore, their explosive range is 4%–75%, meaning that ignition can easily lead to deflagration or explosion, severely impacting the safety of the test bench.

[0004] Therefore, how to provide a noise reduction device that is suitable for hydrogen environments and can guarantee noise reduction effect has become a technical problem that needs to be solved in this field. Summary of the Invention

[0005] In view of this, this application proposes a noise reduction device and a noise reduction tower.

[0006] According to the first aspect of this application, a noise reduction device is proposed, comprising: a main body and an escaping duct disposed inside the main body; wherein the top to bottom of the escaping duct is shaped like an inverted frustum, the bottom of the escaping duct is closed, and a plurality of first escaping holes are provided on the top surface.

[0007] Preferably, the density of the first venting pore is 30%-40%, and the pore diameter is 20mm-30mm.

[0008] Preferably, the main body has a first end and a second end opposite each other along the axial direction; the first end to the second end of the main body is frustoconical.

[0009] Preferably, the main body is connected to the escaping air duct via a transition section.

[0010] Preferably, the main body has a first end and a second end opposite to each other along the axial direction; the transition end includes: a first transition section, through which the first end of the main body is connected to the top end of the escaping air duct; and a second transition section, through which the second end of the main body is connected to the bottom end of the escaping air duct.

[0011] Preferably, both the first transition section and the second transition section are gradually narrowing or gradually widening, the large ends of the first transition section and the large ends of the second transition section are arranged opposite to each other, and the large ends are both connected to the main body, while the small ends are both connected to the escaping air duct.

[0012] Preferably, a plurality of second vent holes are uniformly provided on the outer peripheral surface of the main body and the vent duct.

[0013] Preferably, the main body, the venting duct, and the transition section are all made of stainless steel.

[0014] Preferably, the length of the silencing device is 2m-3m.

[0015] According to a second aspect of this application, a silencing tower is provided, wherein a plurality of silencing devices are provided inside the silencing tower and are connected in series, wherein the silencing devices are the aforementioned silencing devices.

[0016] The silencing device in this application, by providing an escaping duct inside the main body of the silencing device and a first escaping hole at the top, allows hydrogen gas entering the silencing device to be discharged through the escaping duct, preventing hydrogen gas from accumulating inside the silencing device and enabling rapid discharge of hydrogen gas; secondly, the inverted frustum shape from the top to the bottom of the escaping duct effectively increases the exhaust area, further improving the hydrogen gas discharge speed; thus, the silencing device can be used in hydrogen environments while ensuring the silencing effect.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application, and the illustrative embodiments and descriptions thereof are used to explain this application. In the drawings: Figure 1 This is a schematic diagram of the silencing device according to this application.

[0019] Figure 2 This is a three-dimensional schematic diagram of the main body of the silencing device according to this application.

[0020] Figure 3 This is a three-dimensional schematic diagram of the venting air duct of the silencer device according to this application.

[0021] Figure 4 This is a schematic diagram showing the location of the first vent hole of the silencing device according to this application.

[0022] Figure 5 This is the hydrogen escape path when there is no air intake in the silencer device according to this application.

[0023] Figure 6The silencer device according to this application has a hydrogen escape path when it has an intake.

[0024] Figure 7 This is a schematic diagram of the arrangement of the silencing devices in the silencing tower according to this application. Detailed Implementation

[0025] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-4 As shown, according to the first aspect of this application, a noise reduction device is proposed, which includes: a main body 1 and an escaping air duct 2 disposed inside the main body 1; wherein, the top end of the escaping air duct 2 is shaped like an inverted frustum, the bottom end of the escaping air duct 2 is closed, and a plurality of first escaping holes 21 are provided on the top surface.

[0027] The aforementioned venting duct 2 is coaxially disposed in the inner cavity of the main body 1 and located on its radial inner side, and there is a radial gap between the two. The radial gap is filled with sound-absorbing cotton, such as glass wool or slag wool, to achieve a sound-absorbing effect.

[0028] The aforementioned venting duct 2 has an inverted frustum shape from top to bottom, and its radial cross-section can be circular, square, rectangular, triangular, or polygonal. In this application, an inverted frustum shape with a square radial cross-section is used as an example. A first vent hole 21 is provided at the top of the venting duct 2, significantly increasing the effective exhaust flow area. This allows hydrogen entering the silencer to converge upwards through the venting duct 2 and exit through the first vent hole 21, thereby preventing hydrogen accumulation within the silencer, reducing the hydrogen concentration, and improving the safety of the silencer. Simultaneously, the inverted frustum-shaped venting duct 2 optimizes the airflow path, reduces eddies and stagnation areas, and ensures smooth airflow after passing through the silencer, achieving immediate hydrogen entry and exit, greatly shortening the residence time of hydrogen within the silencer structure, and thus achieving a synergistic improvement in silencer performance and gas dispersion.

[0029] Therefore, the silencing device in this application, by providing an escaping air duct inside the main body of the silencing device and a first escaping hole at the top, allows hydrogen gas entering the silencing device to be discharged through the escaping air duct, preventing hydrogen gas from accumulating inside the silencing device and enabling rapid discharge of hydrogen gas; secondly, the inverted frustum shape from the top to the bottom of the escaping air duct effectively increases the exhaust area, further improving the hydrogen gas discharge speed; thus, the silencing device can be used in hydrogen environments while ensuring the silencing effect.

[0030] To minimize hydrogen accumulation within the sound-absorbing structure, the density of the first vent 21 is preferably 30%-40%, and the pore size is 20mm-30mm. The specific density can be selected according to actual needs; for example, the density of the first vent 21 can be 30%, 35%, or 40%, and the pore size can be 20mm, 25mm, or 30mm. Hydrogen entering the vent duct 2, due to its lower density, will rise and accumulate, thus being discharged through the first vent 21.

[0031] To reduce the amount of hydrogen entering the escaping duct 2, preferably, the main body 1 has a first end and a second end along the axial direction; the first end to the second end of the main body 1 can be frustoconical, and the radial cross-section of the main body 1 can be circular, square, rectangular, triangular or polygonal. In this application, a frustoconical shape with a square cross-section is used as an example. The frustoconical main body 1 can generate an active flow field guiding effect at the airflow inlet. The gradually expanding cross-section utilizes density differences and aerodynamic effects to significantly separate the light mainstream hydrogen and the heavy air phase on the outer periphery of the main body 1 and concentrate them in the core area of ​​the flow channel. At the same time, a low-energy vortex zone or a low-permeability retention zone is formed on the outer periphery of the main body 1, thereby minimizing the permeation path and amount of hydrogen into the sound-absorbing cotton at the source and reducing the risk of accumulation from the source.

[0032] To minimize hydrogen accumulation, preferably, the main body 1 can be connected to the venting duct 2 via a transition section. The transition section may include: a first transition section 31, through which the first end of the main body 1 is connected to the top of the venting duct; and a second transition section 32, through which the second end of the main body 1 is connected to the bottom of the venting duct. Both the first transition section 31 and the second transition section 32 are gradually narrowing or widening, with the larger ends of the first transition section 31 and the second transition section 32 facing each other, and both larger ends connected to the main body, while their smaller ends are connected to the venting duct. The smaller ends of the first transition section 31 and the second transition section 32 are located at both ends of the silencer, and their surfaces from the smaller end to the larger end have an inclined angle of 30°, thereby maximizing the prevention of hydrogen accumulation. The connection between the main body 1 and the first transition section 31 and the second transition section 32 can be welding; the connection between the escaping air duct 2 and the second transition section 32 can be welding.

[0033] To prevent hydrogen from accumulating within the silencer, preferably, the outer periphery of the main body 1 and the venting duct 2 can be uniformly provided with multiple second venting holes 11. This allows hydrogen to form multi-path diffusion and pressure relief channels during flow, preventing hydrogen accumulation in localized spaces and thus reducing the risk of explosion. Simultaneously, in conjunction with the silencer structure within the venting duct, multi-stage attenuation of airflow noise is achieved, and some sound energy is released through the second venting holes 11, weakening the standing wave effect and improving silencer efficiency. The aperture of the aforementioned second venting holes 11 can be 5mm, and the density can be 50%-60%, which can be selected according to actual needs.

[0034] The air inlet of the aforementioned silencer is the first end of the main body 1. When there is no air intake, most of the hydrogen gas passing through the second end of the main body 1 (such as...) Figure 5 The yellow arrow in the image is significantly separated from the outer peripheral surface of the main body 1, inhibiting hydrogen from permeating into the silencer. A small amount of hydrogen (such as...) enters the silencer. Figure 5 The red arrow in the image indicates that the airflow will escape through the vent duct 2 and the first vent hole 21 at the top.

[0035] When air is intaked, the hydrogen gas passing through the first end of the main body 1 will significantly separate from the outer peripheral surface of the main body 1, escaping upwards, and some air (such as...) will also be released. Figure 6 (As shown by the blue arrow in the image) It enters from the first vent hole 11 of the vent duct 2, inhibiting hydrogen from penetrating into the silencer and also blowing away the existing hydrogen in the sound-absorbing cotton of the silencer (such as...). Figure 6 (As indicated by the yellow arrow in the image).

[0036] To improve the safety and reliability of the silencer, preferably, the main body 1, the vent duct 2, and the transition section are all made of stainless steel, so that they are not prone to hydrogen-induced cracking or delayed fracture in a hydrogen environment, thereby avoiding the risk of hydrogen leakage due to structural failure; at the same time, it improves the structural reliability and service life of the silencer under pressure fluctuations and long-term service conditions, and ensures the stability of the silencer performance.

[0037] In a preferred embodiment, the length of the silencer is 2m-3m to shorten the passage path of hydrogen within the silencer. By shortening the length of the silencer, the overall escape path that hydrogen needs to traverse within the silencer is reduced. The shorter silencer significantly reduces the straight-line distance and diffusion path of hydrogen from the inlet to the outlet, which directly reduces its residence time in any local area, thereby effectively avoiding the risk of hydrogen accumulation and reaching the lower explosive limit (4%).

[0038] According to the second aspect of this application, such as Figure 6As shown, a silencing tower is proposed, which contains multiple silencing devices connected in series. These silencing devices are those described above. Through this multi-stage series arrangement, sound waves and airflow undergo multiple silencing processes by sequentially passing through each silencing device, effectively ensuring and even improving the overall silencing performance of the silencing tower.

[0039] The preferred embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0040] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0041] Furthermore, various different embodiments of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed by this invention.

Claims

1. A noise reduction device, characterized in that, The noise reduction device includes: The main body (1) and the venting duct (2) disposed inside the main body (1); The escaping duct (2) is shaped like an inverted frustum from top to bottom. The bottom of the escaping duct (2) is closed, and the top surface is provided with a plurality of first escaping holes (21).

2. The silencing device according to claim 1, characterized in that, The density of the first vent hole (21) is 30%-40%, and the pore size is 20mm-30mm.

3. The silencing device according to claim 1, characterized in that, The main body (1) has a first end and a second end opposite to each other along the axial direction; the first end to the second end of the main body (1) is frustoconical.

4. The silencing device according to claim 1 or 3, characterized in that, The main body (1) is connected to the escaping air duct (2) through a transition section.

5. The silencing device according to claim 4, characterized in that, The transition end includes: First transition section (31), the first end of the main body (1) is connected to the top end of the escaping air duct (2) through the first transition section (31); The second transition section (32) connects the second end of the main body (1) to the bottom end of the escaping air duct (2) through the second transition section (32).

6. The silencing device according to claim 5, characterized in that, The first transition section (31) and the second transition section (32) are both gradually narrowed or gradually widened. The large end of the first transition section (31) and the large end of the second transition section (32) are arranged opposite to each other, and the large end is connected to the main body (1), and the small end is connected to the escaping air duct (2).

7. The silencing device according to claim 1, characterized in that, The outer periphery of the main body (1) and the venting duct (2) is uniformly provided with a plurality of second venting holes (11).

8. The silencing device according to claim 3, characterized in that, The main body (1), the venting duct (2), and the transition section are all made of stainless steel.

9. The silencing device according to claim 1, characterized in that, The length of the silencing device is 2m-3m.

10. A silencer tower, characterized in that, The silencing tower is equipped with multiple silencing devices, which are connected in series. The silencing device is the silencing device described in any one of claims 1-9.

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