Flexible composite ventilation and noise elimination channel structure, prefabricated cabin and cabinet

Abstract

The invention discloses a flexible composite ventilation silencing channel structure which comprises a first silencer, a flexible connection reducing channel and a second silencer which are sequentially connected in series in the air inlet direction. A plurality of sound absorption assemblies are arranged in the flexible connection section, the two ends of the flexible connection section are connected between the first silencer and the second silencer through flanges and bolts to form a sealed silencing channel, and the sectional area of the whole flexible connection variable-diameter channel is changed, so that the cross section of an air opening of the first silencer is smaller than the cross section of a cavity of the flexible connection variable-diameter channel. The section of a cavity of the flexible connection reducing channel is smaller than the cross section of an air opening of the second silencer, and therefore a plurality of expansion silencing sections are formed. The invention further discloses a prefabricated cabin and a cabinet with the flexible composite ventilation and noise elimination channel structure. Through collaborative design of all the assemblies, efficient suppression of broadband noise can be achieved, the airflow circulation efficiency can be guaranteed, the flexible connection reducing channel further has self-adaptive compensation of thermal expansion and cold contraction, and acoustic performance and operation reliability are both considered.

Description

Technical Field

[0001] This invention belongs to the field of noise reduction technology for power electronic equipment, and relates to a flexible composite ventilation and sound-absorbing channel structure, a prefabricated cabin, and a cabinet. Background Technology

[0002] The high-intensity noise generated during the operation of power electronic equipment has become a core technological bottleneck restricting its large-scale application. Noise issues not only significantly increase the difficulty and cost of project site selection and construction, but also limit the deployment and application of power electronic equipment in critical scenarios such as urban core areas and residential areas, severely hindering the marketization of emerging industries such as flexible interconnection and energy storage. Therefore, overcoming key technologies for noise control in power electronic equipment and breaking the "NIMBY" dilemma has become an urgent need for the industry's development.

[0003] Existing noise reduction technologies for power electronic equipment still suffer from three major pain points and lack systematic solutions: 1. Insufficient full-frequency noise reduction performance: Single-structure silencers (such as reactive and resistive silencers) are limited by their own principles and cannot effectively cover noise across the entire frequency band. Resistive silencers have a certain suppression effect on mid-to-high frequency noise, but their efficiency in controlling low-frequency noise is generally less than 20%. Reactive silencers can specifically weaken low-frequency noise, but their suppression effect on mid-to-high frequency noise is limited. In existing technologies, some solutions optimize broadband noise reduction through multi-cavity series connection and composite sound-absorbing materials. However, in order to pursue low-frequency noise reduction performance, it is often necessary to increase the cavity volume, resulting in a significant increase in equipment size (usually more than 30% larger than conventional structures). This not only occupies more installation space but also causes problems in transportation and assembly, making it difficult to adapt to the compact deployment requirements of power electronic equipment. 2. Structural Failure Caused by Thermal Stress: During the operation of power electronic equipment, internal metal pipes and silencing components undergo significant thermal expansion and contraction due to temperature fluctuations (especially during converter start-up and shutdown, where temperature differences can reach over 80°C). Existing silencers and pipes often use rigid connections, lacking effective thermal stress buffering mechanisms. Long-term cyclic thermal deformation easily leads to weld cracking at the connection points and aging and failure of seals. This not only compromises the sealing of the silencing channel (causing noise leakage) but also shortens the silencer's service life. In severe cases, it may cause structural failures, affecting the overall operational reliability of the equipment. 3. The contradiction between noise reduction and airflow resistance is prominent: Some noise reduction solutions optimize the structure by increasing the amount of sound-absorbing material and reducing the flow cross-section in order to improve the noise reduction effect. However, this leads to a significant increase in airflow resistance (the drag coefficient is usually higher than 0.8), which directly causes a decrease in ventilation efficiency and insufficient system heat dissipation capacity, resulting in increased equipment energy consumption (measured energy consumption increases by 10%-15%). More importantly, in high-pressure exhaust scenarios, the violent impact and turbulence between high-speed airflow and the noise-absorbing material may generate secondary noise (frequency concentrated in 500-2000Hz), which in turn cancels out part of the noise reduction effect, forming a vicious cycle of "noise reduction - increased resistance - secondary noise".

[0004] To address the aforementioned pain points, existing technologies mostly focus on isolated improvements to single problems, such as optimizing the noise reduction structure or connection method individually. Therefore, there is an urgent need to develop a composite channel structure that can simultaneously meet the requirements of wideband noise reduction, thermal stress compensation, low airflow resistance, and convenient maintenance. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to overcome the problems of traditional silencers having a single structure that makes it difficult to cover the entire frequency band of noise and lacking an effective thermal stress buffering mechanism, and to provide a flexible composite ventilation and noise reduction channel structure.

[0006] Another objective of this invention is to provide a prefabricated cabin having the aforementioned flexible composite ventilation and noise reduction channel structure.

[0007] Another object of the present invention is to provide a cabinet having the above-mentioned flexible composite ventilation and noise reduction channel structure.

[0008] Technical Solution: The present invention provides a flexible composite ventilation silencing channel structure, comprising a first silencer, a flexible connecting variable diameter channel, and a second silencer connected in series along the air inlet direction; the flexible connecting variable diameter channel includes a flange, a flexible connecting section, and sound-absorbing components. Multiple sets of sound-absorbing components are provided inside the flexible connecting section. The two ends of the flexible connecting section are connected between the first silencer and the second silencer by flanges and bolts to form a sealed silencing channel. The cross-sectional area of ​​the entire flexible connecting variable diameter channel varies, such that the cross-sectional area of ​​the air outlet of the first silencer is smaller than the cross-sectional area of ​​the cavity of the flexible connecting variable diameter channel, and the cross-sectional area of ​​the cavity of the flexible connecting variable diameter channel is smaller than the cross-sectional area of ​​the air outlet of the second silencer, thereby forming multiple expanding silencing sections.

[0009] Furthermore, the flexible connection section is an aluminum foil flexible tube or a canvas flexible tube, with aramid sound-absorbing cotton fixed inside.

[0010] Furthermore, the sound-absorbing component includes high-density acoustic cotton, particulate sound-absorbing board, mounting base, and connector. The high-density acoustic cotton and particulate sound-absorbing board are mounted on the mounting base and connected to the inner wall of the flexible connecting variable diameter channel through the connector.

[0011] Furthermore, the high-density acoustic cotton is trapezoidal in shape, which can increase the sound absorption area and improve noise reduction performance.

[0012] Furthermore, the first and second silencers are resistive silencers, including a housing, and a plurality of sound-absorbing plates are provided inside the housing. The cross-section of the sound-absorbing plates from left to right is a stainless steel perforated plate, aramid sound-absorbing cotton, damping sound insulation felt, aramid sound-absorbing cotton, and a stainless steel outer shell.

[0013] Furthermore, the perforation rate of the stainless steel perforated plate is 15-25%.

[0014] Furthermore, the two ends of the sound-absorbing plate are provided with guide wedges, which can reduce airflow resistance.

[0015] Furthermore, the first silencer is a folding plate silencer, and the thicknesses of the stainless steel perforated plate, aramid sound-absorbing cotton, damping sound insulation felt, aramid sound-absorbing cotton, and stainless steel shell of the silencer plate are 0.6mm, 6-7mm, 4-6mm, 6-7mm, and 0.6mm, respectively.

[0016] Furthermore, the second silencer is a louvered silencer, with the thicknesses of the stainless steel perforated plate, aramid sound-absorbing cotton, damping sound insulation felt, aramid sound-absorbing cotton, and stainless steel shell being 0.6mm, 13-14mm, 3-5mm, 13-14mm, and 0.6mm, respectively. This can improve the sound absorption underestimation effect in the sound absorption resonance zone and the coincidence zone.

[0017] The second aspect of the present invention is to provide a prefabricated cabin with the above-mentioned flexible composite ventilation and noise reduction channel structure, including a cabinet and a cabin body. The cabinet is disposed in the cabin body, and the cabinet is provided with a cabinet air inlet and a cabinet air outlet. The cabin body is provided with a cabin air inlet and a cabin air outlet. The cabin air inlet and the cabinet air inlet are connected by the flexible composite ventilation and noise reduction channel structure, and the cabinet air outlet and the cabin air outlet are connected by the flexible composite ventilation and noise reduction channel structure.

[0018] The third aspect of the present invention is to provide a cabinet having the above-mentioned flexible composite ventilation and noise reduction channel structure, including a cabinet body, an air inlet and an air outlet on the cabinet body, an air duct inside the cabinet body, the air inlet and the air duct being connected by the flexible composite ventilation and noise reduction channel structure, and the air duct and the air outlet being connected by the flexible composite ventilation and noise reduction channel structure.

[0019] Beneficial effects: This invention uses a series channel consisting of a first silencer, a flexible variable-diameter channel, and a second silencer. The silencers on both sides can suppress low-to-mid frequency noise and mid-to-high frequency noise respectively. The flexible variable-diameter channel connects the silencers on both sides. The cross-sectional area of ​​the entire flexible variable-diameter channel changes, forming multiple expanded silencing sections. Furthermore, the flexible connection can achieve adaptive compensation for thermal expansion and contraction, solving the problem that conventional rigid connection methods lack a buffer mechanism and are prone to structural failure after long-term use. It can balance the silencing effect and airflow resistance. With the coordinated cooperation of the entire structure, it breaks through the limitations of existing technologies and provides an industrial noise control solution that combines the advantages of wideband noise reduction, structural reliability, and modular maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the flexible connector variable diameter channel.

[0022] Figure 3 This is a schematic diagram of the flange structure of a flexible connecting variable diameter channel.

[0023] Figure 4 This is a schematic diagram of the sound-absorbing component.

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the sound-absorbing sheet.

[0025] Figure 6 This is a schematic diagram of the structure of a folding plate silencer in one embodiment, where (a) is a front view, (b) is a side view, and (c) is a top view.

[0026] Figure 7 This is a schematic diagram of the structure of a louvered silencer in one embodiment, where (a) is a front view, (b) is a side view, and (c) is a top view.

[0027] Figure 8 This is a schematic diagram of the internal structure of the prefabricated cabin in Example 2.

[0028] Figure 9 This is a schematic diagram of the internal structure of Example 3. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figure 1-7As shown, this embodiment of a flexible composite ventilation silencing channel structure includes a first silencer 1, a flexible connecting variable diameter channel 2, and a second silencer 3 connected in series along the air inlet direction. The flexible connecting variable diameter channel 2 includes a flange 201, a flexible connecting section 202, and sound-absorbing components 203. Multiple sets of sound-absorbing components 203 are provided inside the flexible connecting section 202. The two ends of the flexible connecting section 202 are connected between the first silencer 1 and the second silencer 2 through the flange 201 and bolts to form a sealed silencing channel. The cross-sectional area of ​​the entire flexible connecting variable diameter channel 2 varies. By adjusting the cross-sectional area of ​​the flexible connecting variable diameter channel 2, the cross-sectional area of ​​the air outlet of the first silencer 1 is smaller than the cross-sectional area of ​​the cavity of the flexible connecting variable diameter channel, and the cross-sectional area of ​​the cavity of the flexible connecting variable diameter channel is smaller than the cross-sectional area of ​​the air outlet of the second silencer 3, thereby forming multiple expanded silencing sections, which can effectively cover broadband noise and reduce airflow-generated noise. Meanwhile, multiple sets of sound-absorbing components 203 are installed inside the flexible connection section 202 of the flexible connection variable diameter channel 1, which can further cover multi-frequency noise and effectively reduce noise in the ventilation channel.

[0032] In one specific embodiment, the flexible connection section 202 uses an aluminum foil flexible tube or a canvas flexible tube, with aramid sound-absorbing cotton fixed inside. The aramid sound-absorbing cotton can be fixed with steel wire, and installed internally by adhesive bonding or spot welding. The sound-absorbing component 203 consists of high-density acoustic cotton 2031, particulate sound-absorbing board 2032, mounting base 2033, and connector 2034. The high-density acoustic cotton 2031 and particulate sound-absorbing board 2032 are mounted on the mounting base 2033 and connected to the inner wall of the flexible connection section 202 by welding or riveting through the connector 2034. The sound-absorbing component 203 can further cover multi-frequency noise, wherein the high-density acoustic cotton 2031 is trapezoidal in shape, which can increase the sound absorption area and improve noise reduction performance.

[0033] In one specific embodiment, the first muffler 1 and the second muffler 3 are resistive mufflers, each including a housing 4, within which a plurality of sound-absorbing plates 5 are disposed, such as... Figure 5 As shown, the cross-section of the sound-absorbing plate 5 from left to right is a stainless steel perforated plate 501, an aramid sound-absorbing cotton 502, a damping sound insulation felt 503, an aramid sound-absorbing cotton 502, and a stainless steel shell 504. The perforation rate of the stainless steel perforated plate 501 is 25%. The first silencer 1 and the second silencer 3 can improve the sound absorption underestimation effect in the sound absorption resonance zone and the coincidence zone. Furthermore, at both ends of the sound-absorbing plate 5, there are guide wedges 6 with a guide angle of 120°, which can reduce airflow resistance and reduce secondary noise.

[0034] like Figure 6As shown, in one specific embodiment, the first silencer 1 is a folding plate silencer, and the thicknesses of the materials of its silencer plate 6, including the stainless steel perforated plate, aramid sound-absorbing cotton, damping sound insulation felt, aramid sound-absorbing cotton, and stainless steel shell, are 0.6mm, 6-7mm, 4-6mm, 6-7mm, and 0.6mm, respectively.

[0035] like Figure 7 As shown, in one specific embodiment, the second silencer 3 is a louvered silencer, and the thicknesses of the materials of its silencer plate 6, including the stainless steel perforated plate, aramid sound-absorbing cotton, damping sound insulation felt, aramid sound-absorbing cotton, and stainless steel shell, are 0.6mm, 13-14mm, 3-5mm, 13-14mm, and 0.6mm, respectively.

[0036] Example 2

[0037] like Figure 8 As shown, this embodiment is a prefabricated cabin with the aforementioned flexible composite ventilation and noise reduction channel structure, including a cabinet 7 and a cabin 8. The cabinet 7 is disposed inside the cabin 8, and the cabinet 7 is provided with a cabinet air inlet 701 and a cabinet air outlet 702. The cabin 8 is provided with a cabin air inlet 801 and a cabin air outlet 802. The cabin air inlet 801 and the cabinet air inlet 701 are connected by a flexible composite ventilation and noise reduction channel structure, that is, a first silencer 1 is installed at the cabin air inlet 801, and the cabinet... A second silencer 3 is installed at the air inlet 701. The first silencer 1 and the second silencer 3 are sealed and silenced by a flexible connecting variable diameter channel 2. The cabinet air outlet 702 and the cabin air outlet 802 are connected by a flexible composite ventilation and silencer channel structure. That is, the first silencer 1 is installed at the cabinet air outlet 702, and the second silencer 3 is installed at the cabin air outlet 802. The first silencer 1 and the second silencer 3 are sealed and silenced by a flexible connecting variable diameter channel 2.

[0038] In one specific implementation, the prefabricated cabin contains a cabinet housing equipment such as PCS and transformers. Due to the significant noise and dimensional requirements during operation, the aforementioned flexible composite ventilation and noise reduction channel structure is used for heat dissipation and ventilation. Air outlets are located on both sides of the top of the cabin 8 and the cabinet 7, while air inlets are located on both sides of the bottom. Depending on the different heat dissipation requirements, the left-side air inlets and outlets of the cabin use 150mm louvered silencers connected to the PCS silencer in the cabinet via a flexible connecting variable-diameter channel 2. The right-side air inlets and outlets of the cabin are equipped with 300mm louvered silencers connected to the PCS silencer in the cabinet via the flexible connecting variable-diameter channel 2. This not only enhances the noise reduction effect but also increases the reliability and convenience of connecting the air inlets and outlets to the PCS silencers. When the prefabricated cabin begins operation, external cold air flows in through the bottom air inlets, passing through the flexible connections for double noise reduction, significantly lowering the noise at the air inlets. The airflow passes through the PCS silencer in the prefabricated compartment, carrying the internal heat of the cabinet to the air outlet at the top. After passing through the flexible connecting variable diameter channel and the louvered silencer to complete double noise reduction, the airflow flows out.

[0039] Example 3

[0040] like Figure 9 As shown, this embodiment is a cabinet with the above-mentioned flexible composite ventilation and noise reduction channel structure, including a cabinet body 10. The cabinet body 10 is provided with an air inlet 1001 and an air outlet 1002. The cabinet body 10 is provided with an air duct 11. The air inlet 1001 and the air duct 11, and the air duct 11 and the air outlet 1002 are connected by a flexible composite ventilation and noise reduction channel structure. That is, a first silencer 1 is installed at the air inlet 1001, and the first silencer 1 and the air duct 11 are sealed and noise-reducingly connected by a flexible connecting variable diameter channel 2. A second silencer 3 is installed at the air outlet 1002, and the air duct 11 and the second silencer 3 are sealed and noise-reducingly connected by a flexible connecting variable diameter channel 2.

[0041] In one specific implementation, the cabinet houses heat-generating equipment such as transformers, capacitors, and resistors, requiring high noise levels. Therefore, the aforementioned flexible composite ventilation and sound-absorbing channel structure is used for noise reduction and heat dissipation. The top two sides of the cabinet are air inlets, and the bottom is the air outlet. The top air inlets use 150mm folding plate silencers connected to the air duct via a flexible connecting variable diameter channel 2. The bottom air outlet uses a 300mm louvered silencer connected to the air duct via the same flexible connecting variable diameter channel 2, forming a heat dissipation system for the internal components. When the cabinet starts operating, the internal fan draws external airflow into the cabinet through the 150mm folding plate silencers. After further noise reduction via the flexible connecting variable diameter channel 2, the airflow enters the cabinet, significantly reducing noise at the air inlets. The airflow then flows through the designed air duct to dissipate heat from the internal equipment, before flowing through the bottom flexible connecting variable diameter channel 2 to the 300mm louvered silencer and exiting from the air outlet.

Claims

1. A flexible composite vented and acoustically damped passage structure, characterized by, The application relates to a flexible composite ventilation and sound elimination channel structure.

2. The flexible composite vented and attenuated passage structure of claim 1, wherein, The flexible connection variable-diameter channel comprises flanges, a flexible connection section and sound absorption components, a plurality of groups of sound absorption components are arranged in the flexible connection section, the flexible connection section is connected between the first sound eliminator and the second sound eliminator through the flanges and bolts to form a sealed sound elimination channel, the cross-sectional area of the whole channel of the flexible connection variable-diameter channel changes, the air inlet cross section of the first sound eliminator is smaller than the cavity cross section of the flexible connection variable-diameter channel, and the cavity cross section of the flexible connection variable-diameter channel is smaller than the air inlet cross section of the second sound eliminator, so that a plurality of expansion sound elimination sections are formed.

3. The flexible composite vented and attenuated passage structure of claim 1, wherein, The flexible connection section is an aluminum foil hose or a canvas hose, and aramid sound absorption cotton is fixed in the flexible connection section.

4. The flexible composite vented and attenuated passage structure of claim 3, wherein, The sound absorption component comprises high-density sound wave cotton, a micro-particle sound absorption plate, a mounting base and a connecting piece, the high-density sound wave cotton and the micro-particle sound absorption plate are mounted on the mounting base and are connected to the inner wall of the flexible connection variable-diameter channel through the connecting piece.

5. The flexible composite vented and attenuated passage structure of claim 1, wherein, The high-density sound wave cotton is in a trapezoidal shape.

6. The flexible composite vented and attenuated passage structure of claim 5, wherein, The first sound eliminator and the second sound eliminator are resistive sound eliminators, and each comprises a shell, a plurality of sound elimination sheets are arranged in the shell, and the cross sections of the sound elimination sheets from left to right are a stainless steel perforated plate, aramid sound absorption cotton, damping sound insulation felt, aramid sound absorption cotton and a stainless steel shell.

7. The flexible composite vented and attenuated passage structure of claim 5, wherein, The perforation rate of the stainless steel perforated plate is 15-25%.

8. A flexible composite vented and attenuated duct structure according to any of claims 5-7, characterised in that, The sound elimination sheets are provided with flow guide sharp wedges at two ends.

9. The composite vented silencer duct structure of claim 8, wherein, The first sound eliminator is a folded plate type sound eliminator, the thicknesses of the stainless steel perforated plate, the aramid sound absorption cotton, the damping sound insulation felt, the aramid sound absorption cotton and the stainless steel shell of the sound elimination sheets are 0.6mm, 6-7mm, 4-6mm, 6-7mm and 0.6mm respectively.

10. A prefabricated cabin having the flexible composite vented and damped duct structure according to any one of claims 1 to 7, characterized in that, The second sound eliminator is a louver type sound eliminator, the thicknesses of the stainless steel perforated plate, the aramid sound absorption cotton, the damping sound insulation felt, the aramid sound absorption cotton and the stainless steel shell of the sound elimination sheets are 0.6mm, 13-14mm, 3-5mm, 13-14mm and 0.6mm respectively.

11. A cabinet having the flexible composite vented and acoustically damped passage structure of any one of claims 1-7, wherein, The application relates to a flexible composite ventilation and sound elimination channel structure. The application relates to a flexible composite ventilation and sound elimination channel structure.

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