WO2021258432A1 - Composite air intake muffler device for high-speed centrifugal fan - Google Patents

Composite air intake muffler device for high-speed centrifugal fan Download PDF

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Publication number
WO2021258432A1
WO2021258432A1 PCT/CN2020/101457 CN2020101457W WO2021258432A1 WO 2021258432 A1 WO2021258432 A1 WO 2021258432A1 CN 2020101457 W CN2020101457 W CN 2020101457W WO 2021258432 A1 WO2021258432 A1 WO 2021258432A1
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WIPO (PCT)
Prior art keywords
muffler
centrifugal fan
speed centrifugal
end cover
muffler device
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PCT/CN2020/101457
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French (fr)
Chinese (zh)
Inventor
方健
余知义
吴立华
董继勇
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南京磁谷科技股份有限公司
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Publication of WO2021258432A1 publication Critical patent/WO2021258432A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Definitions

  • the invention relates to the field of fan noise control, in particular to a composite muffler device for air intake of a high-speed centrifugal fan.
  • High-speed centrifugal fans are widely used in medicine, environmental protection, chemical, petroleum and other industries. During the operation of the fan, there are mainly aerodynamic noise, mechanical noise, motor noise and basic vibration noise, and the noise presents broadband characteristics, and the noise energy in the middle and high frequency bands is relatively high.
  • the intake noise mainly comes from the fundamental frequency of the fan impeller. Noise and intake pulsating airflow sound, or a mixture of the two, intake pulsating airflow sound is mainly low frequency, intake pulsating airflow sound is mainly low frequency 125Hz, 500Hz, 1000Hz octave bands are more prominent, causing people to be irritable and pulse Heart abnormalities.
  • Existing high-speed centrifugal fan air intake silencing technology has the following problems: 1. Narrow silencing frequency band, low noise reduction, and complicated manufacturing process; 2. Serious problem of high frequency failure, low, medium, and high frequency noise for air intake noise Can not be effectively controlled.
  • the present invention discloses a simple manufacturing process, with higher high-frequency failure frequency, silencing frequency bandwidth, and silencing capacity
  • a composite muffler with high-speed centrifugal fan air intake that is large and easy to maintain and install.
  • a composite muffler device for high-speed centrifugal fan air intake including an inlet flange, a first divergent tube, a second divergent tube, a muffler, an upper end cover, a lower end cover and an outlet flange; the first divergent tube
  • the inlet flange and the upper cover plate are connected, and the muffler device is fixed between the upper cover plate and the lower cover plate; the second divergent pipe connects the lower cover plate and the outlet flange.
  • the muffler includes a shell and a muffler channel.
  • the muffler channel includes a perforated plate, a protective surface layer and a sound-absorbing material.
  • the protective surface layer is located between the perforated plate and the sound-absorbing material.
  • the perforated plate is located at the innermost side of the The surface layer is tightly laminated on the sound-absorbing material; the perforated plate is arranged with evenly arranged circular holes, and the perforated plate, the protective surface layer and the sound-absorbing material together form a composite sound-absorbing structure, which can effectively absorb the low-frequency pulsating noise of the intake air.
  • the small end of the first diverging tube is connected with the inlet flange, the large end is connected with the end face of the upper cover plate; the large end of the second diverging tube is connected with the end face of the lower cover plate, and the small end is fixedly connected with the outlet flange;
  • the divergent tube is based on the expansion and silencing theory, which is beneficial to the expansion structure of the flow field optimization, and effectively reduces the pressure loss; it can effectively reduce the low-frequency noise, and at the same time facilitate the air flow, reduce the resistance loss of the gas, and ensure the intake efficiency.
  • the upper cover plate and the lower cover plate are provided with mounting holes matching the cross-sectional shape of the muffler channel to fix the muffler channel.
  • the cross-sectional shape of the muffler channel includes but is not limited to the following forms: circle, square, regular pentagon, regular hexagon, regular octagon, among which a regular hexagon is preferred; wherein the circumscribed radius of the muffler channel is 50mm ⁇ 250mm , The distance between the edge of the silencing channel is 20mm ⁇ 200mm; the number of silencing channels is 12 ⁇ 40; the high-frequency failure frequency of the silencing channel is high, which is more applicable to the broadband noise of the fan intake, and still performs good silencing for high-frequency noise performance.
  • the sound-absorbing material adopts a porous structure, which can be ultra-fine glass wool or polyurethane foam, preferably ultra-fine glass wool, with a thickness of 20mm ⁇ 150mm; a bulk density of 20kg/m3 ⁇ 50kg/m3, and a moisture content of 0.2% ⁇ 3%;
  • the mass moisture absorption rate is 2%-8%, and the water repellency rate is ⁇ 98%;
  • the ultra-fine glass wool has proper flow resistance, uniform pores, and high sound absorption performance and chemical stability.
  • the material of the perforated plate includes but is not limited to: aluminum alloy, galvanized sheet, etc., preferably galvanized sheet; the hole diameter of the perforated plate is 0.5mm-10mm; the hole spacing is 2mm-15mm, and the thickness of the perforated plate is 2mm-5mm. , Perforation rate is 10% to 40%.
  • the material of the face protection layer includes but is not limited to: glass fiber cloth, non-woven fabric and film, preferably glass fiber cloth.
  • the outlet flange is connected to the inlet pipe of the fan, and the inlet flange is connected to the inlet pipe; after the fan is started, the air passes through the inlet flange from the inlet pipe, and passes through the first divergent pipe. Increase, the gas flow rate decreases, the gas passes through the muffler, and then enters the second diverging tube after being fully muffled.
  • the cross-sectional area gradually decreases, and the gas flow rate increases, and enters the inside of the fan through the outlet flange.
  • the present invention provides a high-speed centrifugal fan air intake composite muffler device, with divergent tubes set at both ends, and the expansion muffler theory is used to effectively reduce low-frequency noise, while facilitating airflow and reducing resistance loss;
  • the muffling channel has a high high frequency failure frequency, which is more applicable to the broadband noise of the fan intake, and still exhibits good muffling performance for high-frequency noise;
  • the sound-absorbing material has good acoustic performance, proper flow resistance, uniform pores, and more High sound absorption performance and chemical stability; when perforated plates and cover layers are used on porous materials, the medium and low frequency sound absorption coefficients will be improved, effectively forming a composite sound absorption structure, effectively absorbing the low frequency pulsation of the intake air Noise:
  • the muffler frequency bandwidth solves the high-frequency failure problem of conventional mufflers.
  • the structure is simple, the manufacturing process is simple, the production is easy, the maintenance and installation are convenient, and it can be used to eliminate
  • Figure 1 is a diagram of the overall structure of the present invention
  • Figure 2 is a cross-sectional view of the muffler structure
  • Figure 3 is a cross-sectional view of the silencing channel
  • Fig. 4 is a three-dimensional view of the perforated plate of the muffler channel in Fig. 3;
  • Figure 5 is a cross-sectional view of the perforated plate of the muffler channel of Figure 3;
  • 1- inlet flange 2- first divergent pipe, 3- second divergent pipe, 4- muffler device, 5- upper end cover, 6-lower end cover, 7-outlet flange, 8-muffler Channel, 801-perforated plate, 802-face protection layer, 803-sound-absorbing material, 9-shell.
  • a high-speed centrifugal fan air intake compound muffler device provided by the present invention, including an inlet flange 1, a first divergent tube 2, a second divergent tube 3, a muffler device 4, upper end Cover 5, lower end cover 6 and outlet flange 7; the small end of the first divergent pipe 2 is connected to the inlet flange 1, and the big end is connected to the upper end cover 5; the muffler is fixed between the upper end cover 5 and the lower end cover 6
  • the muffler device includes a housing 9 and a muffler channel 8, the muffler channel 8 is arranged side by side in the housing 9, the cross-sectional shape of the muffler channel 8 is a regular hexagon.
  • the silencing channel 8 is a composite silencing structure, as shown in Fig. 3, it includes a perforated plate 801, a protective surface layer 802 and a sound-absorbing material 803;
  • the innermost side of the muffler channel 8 is shown in a three-dimensional view as shown in 4, and a cross-sectional view is shown in Fig. 5.
  • the protective surface layer 802 uses glass fiber cloth, which is pressed on the sound-absorbing material 803 by the perforated plate 801.
  • the perforated plate 801 and the protective surface layer 802 effectively form a composite sound-absorbing structure, and the medium and low frequency sound absorption coefficient will be improved. .
  • the sound-absorbing material 803 uses ultra-fine glass wool, which has good acoustic properties, proper flow resistance, uniform pores, and high sound-absorbing performance and chemical stability.
  • the upper end cover 5 and the lower end cover 6 are provided with mounting holes matching the cross section of the muffler channel 8 for fixing the muffler channel 8.
  • the small end of the expansion tube 3 and the outlet flange 7 are fixedly connected.
  • the first divergent tube 2 and the second divergent tube 3 are respectively arranged at both ends of the muffler 4, using the expansion muffler theory, can effectively reduce low-frequency noise, and at the same time facilitate air flow, reduce gas resistance loss, and ensure The air intake efficiency can improve the noise reduction effect of the noise reduction device 4 at the same time.
  • the present invention provides a high-speed centrifugal fan air intake composite muffler, the inlet flange 1 is connected with the air inlet pipe, and the outlet flange 7 is connected with the inlet of the fan.
  • the fan starts, air enters the first diverging pipe through the air inlet pipe 2.
  • the flow velocity decreases, passing through the silencing channel 8 of the silencing device 4, and then entering the second diverging tube 3, the flow velocity increases, and entering the fan through the outlet flange 7 to complete the silencing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A composite air intake muffler device for a high-speed centrifugal fan comprises an inlet flange (1), a first diverging pipe (2), a second diverging pipe (3), a muffler device (4), an upper end cover (5), a lower end cover (6), and an outlet flange (7). A small end of the first divergent pipe (2) is connected to the inlet flange (1). A large end of the first divergent pipe (2) is connected to a surface of the upper end cover (5). The muffler device (4) is mounted between the upper end cover (5) and the lower end cover (6). The other surface of the lower end cover (6) is connected to a large end of the second divergent pipe (3). A small end of the second diverging pipe (3) is connected to the outlet flange (7). The outlet flange (7) is connected to an inlet end of the fan. The muffler device (4) comprises a muffler channel (8) and a housing (9). The muffler channel (8) is arranged in the housing (9). The muffler channel (8) comprises a perforated plate (801), a protective surface layer (802), and a sound-absorbing material (803). The protective surface layer (802) is located between the perforated plate (801) and the sound-absorbing material (803).

Description

一种高速离心式风机进气的复合消声装置A compound muffler device for air intake of high-speed centrifugal fan 技术领域Technical field
本发明涉及风机噪声控制领域，具体涉及一种高速离心式风机进气的复合消声装置。The invention relates to the field of fan noise control, in particular to a composite muffler device for air intake of a high-speed centrifugal fan.
背景技术Background technique
高速离心风机广泛应用于被广泛应用于医药、环保、化工、石油等行业。风机在运行过程中主要有空气动力性噪声、机械噪声、电动机噪声和基础振动噪声，且噪声呈现宽频特点，中、高频段噪声能量均较高，其中进气噪声主要来源于风机叶轮旋基频噪声和进气脉动气流声，或者两者混合所致，进气脉动气流声以低频为主，进气脉动气流声以低频为主125Hz，500Hz，1000Hz倍频带比较突出，引起人们烦躁不安，脉搏心脏异常。现有高速离心式风机进气消声技术存在以下问题：1、消声频带窄、消声量低、制造工艺复杂；2、高频失效严重问题，对于风机进气噪声低、中、高频段噪声无法有效控制。High-speed centrifugal fans are widely used in medicine, environmental protection, chemical, petroleum and other industries. During the operation of the fan, there are mainly aerodynamic noise, mechanical noise, motor noise and basic vibration noise, and the noise presents broadband characteristics, and the noise energy in the middle and high frequency bands is relatively high. The intake noise mainly comes from the fundamental frequency of the fan impeller. Noise and intake pulsating airflow sound, or a mixture of the two, intake pulsating airflow sound is mainly low frequency, intake pulsating airflow sound is mainly low frequency 125Hz, 500Hz, 1000Hz octave bands are more prominent, causing people to be irritable and pulse Heart abnormalities. Existing high-speed centrifugal fan air intake silencing technology has the following problems: 1. Narrow silencing frequency band, low noise reduction, and complicated manufacturing process; 2. Serious problem of high frequency failure, low, medium, and high frequency noise for air intake noise Can not be effectively controlled.
发明内容Summary of the invention
技术目的：针对现有高速离心式风机进气消声技术在消声频带和结构上存在不足，本发明公开了一种制造工艺简单、具有较高的高频失效频率，消声频带宽，消声量大且维护安装方便的一种高速离心式风机进气的复合消声装置。Technical purpose: In view of the shortcomings of the existing high-speed centrifugal fan air intake silencing technology in the silencing frequency band and structure, the present invention discloses a simple manufacturing process, with higher high-frequency failure frequency, silencing frequency bandwidth, and silencing capacity A composite muffler with high-speed centrifugal fan air intake that is large and easy to maintain and install.
技术方案：为实现上述技术目的，本发明采用了如下技术方案：Technical solution: In order to achieve the above technical purpose, the present invention adopts the following technical solutions:
一种高速离心式风机进气的复合消声装置，包括进口法兰、第一渐扩管、第二渐扩管、消声装置、上端盖、下端盖和出口法兰；第一渐扩管连接进口法兰和上盖板，消声装置固定于上盖板和下盖板之间；第二渐扩管连接下盖板和出口法兰。A composite muffler device for high-speed centrifugal fan air intake, including an inlet flange, a first divergent tube, a second divergent tube, a muffler, an upper end cover, a lower end cover and an outlet flange; the first divergent tube The inlet flange and the upper cover plate are connected, and the muffler device is fixed between the upper cover plate and the lower cover plate; the second divergent pipe connects the lower cover plate and the outlet flange.
消声装置包括壳体和消声通道，消声通道包括穿孔板、护面层和吸声材料，护面层位于穿孔板和吸声材料之间，穿孔板位于消声装置最内侧，将护面层压紧在吸声材料上；穿孔板上布置有均匀布置的圆孔，穿孔板和护面层以及吸声材料共同构成复合吸声结构，有效吸收进气的低频脉动噪声。The muffler includes a shell and a muffler channel. The muffler channel includes a perforated plate, a protective surface layer and a sound-absorbing material. The protective surface layer is located between the perforated plate and the sound-absorbing material. The perforated plate is located at the innermost side of the The surface layer is tightly laminated on the sound-absorbing material; the perforated plate is arranged with evenly arranged circular holes, and the perforated plate, the protective surface layer and the sound-absorbing material together form a composite sound-absorbing structure, which can effectively absorb the low-frequency pulsating noise of the intake air.
优选地，第一渐扩管小端和进口法兰连接，大端和上盖板端面连接；第二渐扩管大端和下盖板端面连接，小端和出口法兰固定连接；两端的渐扩管基于扩张消声理论，有利流场优化的扩张结构，有效降低压力损失；可以有效降低低频噪声，同时利于气流流动，减小气体的阻力损失，保证进气效率。Preferably, the small end of the first diverging tube is connected with the inlet flange, the large end is connected with the end face of the upper cover plate; the large end of the second diverging tube is connected with the end face of the lower cover plate, and the small end is fixedly connected with the outlet flange; The divergent tube is based on the expansion and silencing theory, which is beneficial to the expansion structure of the flow field optimization, and effectively reduces the pressure loss; it can effectively reduce the low-frequency noise, and at the same time facilitate the air flow, reduce the resistance loss of the gas, and ensure the intake efficiency.
优选地，上盖板和下盖板上设置有和消声通道截面形状相匹配的安装孔，固定消声通道。Preferably, the upper cover plate and the lower cover plate are provided with mounting holes matching the cross-sectional shape of the muffler channel to fix the muffler channel.
优选地，消声通道截面形状包括但不限于以下形式：圆形、正方形、正五边形、正六边形、正八边形，其中优选正六边形；其中消声通道外接圆半径为50mm～250mm，消声通道边缘距离20mm～200mm；消声通道数量为12～40个；消声通道高频失效频率高，对于风机进气宽频噪声更具有适用性，对于高频段噪声仍表现良好的消声性能。Preferably, the cross-sectional shape of the muffler channel includes but is not limited to the following forms: circle, square, regular pentagon, regular hexagon, regular octagon, among which a regular hexagon is preferred; wherein the circumscribed radius of the muffler channel is 50mm～250mm , The distance between the edge of the silencing channel is 20mm～200mm; the number of silencing channels is 12～40; the high-frequency failure frequency of the silencing channel is high, which is more applicable to the broadband noise of the fan intake, and still performs good silencing for high-frequency noise performance.
优选地，吸声材料选用多孔结构，可以是超细玻璃棉或者聚氨酯泡沫塑料，优选超细玻璃棉，厚度为20mm～150mm；容重20kg/m3～50kg/m3，含水率0.2％～3％；质量吸湿率2％～8％，憎水率≥98％；超细玻璃棉流阻适当，孔隙均匀，有较高的吸声性能和化学稳定性。Preferably, the sound-absorbing material adopts a porous structure, which can be ultra-fine glass wool or polyurethane foam, preferably ultra-fine glass wool, with a thickness of 20mm～150mm; a bulk density of 20kg/m3～50kg/m3, and a moisture content of 0.2%～3%; The mass moisture absorption rate is 2%-8%, and the water repellency rate is ≥98%; the ultra-fine glass wool has proper flow resistance, uniform pores, and high sound absorption performance and chemical stability.
优选地，穿孔板材料包括但不限于：铝合金、镀锌板等，优选镀锌板；穿孔板的孔径为0.5mm～10mm；孔间距为2mm～15mm，穿孔板的板厚为2mm～5mm，穿孔率10％～40％。Preferably, the material of the perforated plate includes but is not limited to: aluminum alloy, galvanized sheet, etc., preferably galvanized sheet; the hole diameter of the perforated plate is 0.5mm-10mm; the hole spacing is 2mm-15mm, and the thickness of the perforated plate is 2mm-5mm. , Perforation rate is 10% to 40%.
优选地，护面层的材料包括但不限于：玻璃纤维布、无纺布和薄膜，优选玻璃纤维布。Preferably, the material of the face protection layer includes but is not limited to: glass fiber cloth, non-woven fabric and film, preferably glass fiber cloth.
本发明使用时，将出口法兰和风机的进口管道连接，进口法兰和进气管道连接；风机启动后，空气从进气管道经过进口法兰，通过第一渐扩管，随着截面积增大，气体流速减小，气体经过消声装置，充分消声之后进入第二渐扩管，截面积逐渐缩小，气体流速加快，通过出口法兰进入风机内部。When the present invention is used, the outlet flange is connected to the inlet pipe of the fan, and the inlet flange is connected to the inlet pipe; after the fan is started, the air passes through the inlet flange from the inlet pipe, and passes through the first divergent pipe. Increase, the gas flow rate decreases, the gas passes through the muffler, and then enters the second diverging tube after being fully muffled. The cross-sectional area gradually decreases, and the gas flow rate increases, and enters the inside of the fan through the outlet flange.
有益效果：本发明所提供的一种高速离心式风机进气的复合消声装置，两端设置渐扩管，利用扩张消声理论，有效降低低频噪声，同时利于气流流动，可以减少阻力损失；消声通道高频失效频率高，对于风机进气宽频噪声更具有适用性，对于高频段噪声仍表现良好的消声性能；吸声材料具有良好的声学性能，流阻适当，孔隙均匀，有较高的吸声性能和化学稳定性；多孔材料上使用穿孔板以及护面层时，中、低频吸声系数会有所提高，有效构成了一种复合吸声结构，有效吸收进气的低频脉动噪声；消声频带宽，解决了常规消声器的高频失效问题，结构简单，制造工艺简单，易于制作，维护安装方便，可用于各种类型和型号风机进气噪声消除。Beneficial effects: The present invention provides a high-speed centrifugal fan air intake composite muffler device, with divergent tubes set at both ends, and the expansion muffler theory is used to effectively reduce low-frequency noise, while facilitating airflow and reducing resistance loss; The muffling channel has a high high frequency failure frequency, which is more applicable to the broadband noise of the fan intake, and still exhibits good muffling performance for high-frequency noise; the sound-absorbing material has good acoustic performance, proper flow resistance, uniform pores, and more High sound absorption performance and chemical stability; when perforated plates and cover layers are used on porous materials, the medium and low frequency sound absorption coefficients will be improved, effectively forming a composite sound absorption structure, effectively absorbing the low frequency pulsation of the intake air Noise: The muffler frequency bandwidth solves the high-frequency failure problem of conventional mufflers. The structure is simple, the manufacturing process is simple, the production is easy, the maintenance and installation are convenient, and it can be used to eliminate the intake noise of various types and models of fans.
附图说明Description of the drawings
为了更清楚地说明本发明施例或现有技术中的技术方案，下面将对实施例或现有技 术描述中所需要使用的附图作简单介绍。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art.
图1为本发明的整体结构图；Figure 1 is a diagram of the overall structure of the present invention;
图2为消声结构截面图；Figure 2 is a cross-sectional view of the muffler structure;
图3为消声通道截面图；Figure 3 is a cross-sectional view of the silencing channel;
图4为图3消声通道的穿孔板三维立体图；Fig. 4 is a three-dimensional view of the perforated plate of the muffler channel in Fig. 3;
图5为图3消声通道的穿孔板截面图；Figure 5 is a cross-sectional view of the perforated plate of the muffler channel of Figure 3;
其中：1-进口法兰、2-第一渐扩管、3-第二渐扩管、4-消声装置、5-上端盖、6-下端盖、7-出口法兰、8-消声通道、801-穿孔板、802-护面层、803-吸声材料、9-壳体。Among them: 1- inlet flange, 2- first divergent pipe, 3- second divergent pipe, 4- muffler device, 5- upper end cover, 6-lower end cover, 7-outlet flange, 8-muffler Channel, 801-perforated plate, 802-face protection layer, 803-sound-absorbing material, 9-shell.
具体实施方式detailed description
下面通过一较佳实施例的方式并结合附图来更清楚完整地说明本发明，但并不因此将本发明限制在所述的实施例范围之中。The following describes the present invention more clearly and completely through a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.
如图1所示为本发明提供的一种高速离心式风机进气的复合消声装置，包括进口法兰1、第一渐扩管2、第二渐扩管3、消声装置4、上端盖5、下端盖6和出口法兰7；第一渐扩管2的小端和进口法兰1连接，大端和上端盖5连接；消声装置固定在上端盖5和下端盖6之间；如图2所示，消声装置包括壳体9和消声通道8，消声通道8并列设置在壳体9内，消声通道8截面形状为采用正六边形。As shown in Figure 1 is a high-speed centrifugal fan air intake compound muffler device provided by the present invention, including an inlet flange 1, a first divergent tube 2, a second divergent tube 3, a muffler device 4, upper end Cover 5, lower end cover 6 and outlet flange 7; the small end of the first divergent pipe 2 is connected to the inlet flange 1, and the big end is connected to the upper end cover 5; the muffler is fixed between the upper end cover 5 and the lower end cover 6 As shown in Figure 2, the muffler device includes a housing 9 and a muffler channel 8, the muffler channel 8 is arranged side by side in the housing 9, the cross-sectional shape of the muffler channel 8 is a regular hexagon.
以风机进风量为210m 3/min，风机进口进口管道直径为D1＝500mm为例，按照原风机进口一米测点噪声能量最高101dB(A)，按照环境噪声标准与降噪要求，设计降噪量40dB，根据进出口扩张比R＝D1/D2＝0.25～0.625，确定有效消声段D2为800mm-2000mm；有效消声长度L为800mm～3000mm。 Taking the fan inlet air volume of 210m 3 /min and the fan inlet pipe diameter D1=500mm as an example, according to the original fan inlet one meter measuring point, the highest noise energy is 101dB(A), and the noise reduction is designed according to the environmental noise standard and noise reduction requirements According to the import and export expansion ratio R=D1/D2=0.25～0.625, it is determined that the effective silencing section D2 is 800mm-2000mm; the effective silencing length L is 800mm～3000mm.
消声通道8为一复合消声结构，如图3所示，包括穿孔板801、护面层802和吸声材料803；穿孔板801优选镀锌板，板面上均匀设置有圆孔，位于消声通道8的最内侧，立体图如4所示，截面图如图5所示。护面层802使用玻璃纤维布，被穿孔板801压紧在吸声材料803上，穿孔板801和护面层802有效构成了一种复合吸声结构，中、低频吸声系数会有所提高。The silencing channel 8 is a composite silencing structure, as shown in Fig. 3, it includes a perforated plate 801, a protective surface layer 802 and a sound-absorbing material 803; The innermost side of the muffler channel 8 is shown in a three-dimensional view as shown in 4, and a cross-sectional view is shown in Fig. 5. The protective surface layer 802 uses glass fiber cloth, which is pressed on the sound-absorbing material 803 by the perforated plate 801. The perforated plate 801 and the protective surface layer 802 effectively form a composite sound-absorbing structure, and the medium and low frequency sound absorption coefficient will be improved. .
吸声材料803使用超细玻璃棉，具有良好的声学性能，流阻适当，孔隙均匀，有较高的吸声性能和化学稳定性。The sound-absorbing material 803 uses ultra-fine glass wool, which has good acoustic properties, proper flow resistance, uniform pores, and high sound-absorbing performance and chemical stability.
上端盖5和下端盖6上设置有和消声通道8的截面相匹配的安装孔，用于固定消声通道8，下端盖6的和第二渐扩管3的大端连接，第二渐扩管3的小端和出口法兰7固 定连接。The upper end cover 5 and the lower end cover 6 are provided with mounting holes matching the cross section of the muffler channel 8 for fixing the muffler channel 8. The small end of the expansion tube 3 and the outlet flange 7 are fixedly connected.
第一渐扩管2和第二渐扩管3分别相对设置在消声装置4的两端，利用扩张消声理论，可以有效降低低频噪声，同时利于气流流动，减小气体的阻力损失，保证进气效率，同时又可以提升消声装置4的消声效果。The first divergent tube 2 and the second divergent tube 3 are respectively arranged at both ends of the muffler 4, using the expansion muffler theory, can effectively reduce low-frequency noise, and at the same time facilitate air flow, reduce gas resistance loss, and ensure The air intake efficiency can improve the noise reduction effect of the noise reduction device 4 at the same time.
本发明提供的一种高速离心式风机进气的复合消声装置，进口法兰1和进气管连接，出口法兰7连接风机的进口，风机启动时，空气通过进气管进入第一渐扩管2，流速降低，通过消声装置4的消声通道8，再进入第二渐扩管3，流速增加，通过出口法兰7进入风机内部，完成消声。The present invention provides a high-speed centrifugal fan air intake composite muffler, the inlet flange 1 is connected with the air inlet pipe, and the outlet flange 7 is connected with the inlet of the fan. When the fan starts, air enters the first diverging pipe through the air inlet pipe 2. The flow velocity decreases, passing through the silencing channel 8 of the silencing device 4, and then entering the second diverging tube 3, the flow velocity increases, and entering the fan through the outlet flange 7 to complete the silencing.
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (10)

  1. 一种高速离心式风机进气的复合消声装置，其特征在于：包括进口法兰(1)、第一渐扩管(2)、第二渐扩管(3)、消声装置(4)、上端盖(5)、下端盖(6)和出口法兰(7)；A composite muffler device for high-speed centrifugal fan air intake, which is characterized in that it includes an inlet flange (1), a first divergent tube (2), a second divergent tube (3), and a muffler device (4) , Upper end cover (5), lower end cover (6) and outlet flange (7);
    所述第一渐扩管(2)小端和进口法兰(1)固定连接，大端和上端盖(5)连接，上端盖(5)的另一面和消声装置(4)连接，消声装置(4)的上、下端面分别和上端盖(5)、下端盖(6)连接，下端盖(6)另一面和第二渐扩管(3)的大端连接，第二渐扩管(3)小端和出口法兰(7)连接；The small end of the first divergent tube (2) is fixedly connected with the inlet flange (1), the large end is connected with the upper end cover (5), and the other side of the upper end cover (5) is connected with the muffler (4), The upper and lower end surfaces of the acoustic device (4) are connected to the upper end cover (5) and the lower end cover (6) respectively, and the other side of the lower end cover (6) is connected to the large end of the second diverging tube (3), and the second diverging tube The small end of the pipe (3) is connected with the outlet flange (7);
    所述消声装置(4)包括消声通道(8)和壳体(9)，消声通道(8)设置于壳体(9)内部；消声通道(8)侧面设置穿孔板(801)、护面层(802)和吸声材料(803)，护面层(802)位于穿孔板(801)和吸声材料(803)之间。The muffling device (4) includes a muffling channel (8) and a housing (9). The muffling channel (8) is arranged inside the housing (9); a perforated plate (801) is provided on the side of the noise-absorbing channel (8) , A protective surface layer (802) and a sound-absorbing material (803), and the protective surface layer (802) is located between the perforated plate (801) and the sound-absorbing material (803).
  2. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述消声通道(8)并列均匀布置在壳体(9)内部，两端通过上端盖(5)和下端盖(6)固定。The composite muffler device for the intake of a high-speed centrifugal fan according to claim 1, characterized in that: the muffler channels (8) are arranged side by side and evenly arranged inside the casing (9), and both ends pass through the upper end cover ( 5) Fix with the lower end cover (6).
  3. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述消声通道(8)边缘距离在20mm～200mm。The composite muffler device for high-speed centrifugal fan intake according to claim 1, characterized in that the edge distance of the muffler channel (8) is 20mm-200mm.
  4. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述消声通道(8)外接圆的半径50mm～150mm，消声通道(8)的数量12～40个。The composite muffler device for high-speed centrifugal fan intake according to claim 1, characterized in that: the radius of the circumscribed circle of the muffler channel (8) is 50mm～150mm, and the number of muffler channels (8) is 12 ~40.
  5. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述消声通道(8)的截面形状是圆形、正方形、正五边形、正六边形、正八边形中的一种。The composite muffler device for the intake of a high-speed centrifugal fan according to claim 1, wherein the cross-sectional shape of the muffler passage (8) is a circle, a square, a regular pentagon, or a regular hexagon. , A kind of regular octagon.
  6. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述吸声材料(803)使用的材料是超细玻璃棉或者聚氨酯泡沫塑料中的一种，吸声材料的厚度在20mm～150mm，容重为20kg/m 3～50kg/m 3。 The composite muffler device for high-speed centrifugal fan air intake according to claim 1, wherein the material used for the sound-absorbing material (803) is one of ultra-fine glass wool or polyurethane foam. The thickness of the sound-absorbing material is 20mm～150mm, and the bulk density is 20kg/m 3 ～50kg/m 3 .
  7. 根据权利要求6所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述吸声材料(803)含水率0.2％～3％，质量吸湿率为2％～8％，憎水率≥98％。A composite muffler device for high-speed centrifugal fan air intake according to claim 6, characterized in that the moisture content of the sound-absorbing material (803) is 0.2% to 3%, and the mass moisture absorption rate is 2% to 8%. , Hydrophobicity ≥98%.
  8. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述护面层(802)材料是玻璃纤维布、无纺布、薄膜中的一种。The composite muffler device for the intake of a high-speed centrifugal fan according to claim 1, wherein the material of the protective surface layer (802) is one of glass fiber cloth, non-woven cloth, and film.
  9. 根据权利要求1所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述穿孔板(801)材料是铝合金或者镀锌板中的一种，设置有均匀布置的小孔， 孔径为0.5mm～10mm，穿孔率10％～40％。The composite muffler device for the intake of a high-speed centrifugal fan according to claim 1, wherein the material of the perforated plate (801) is one of aluminum alloy or galvanized plate, and is provided with uniformly arranged Small holes, the hole diameter is 0.5mm-10mm, and the perforation rate is 10%-40%.
  10. 根据权利要求9所述的一种高速离心式风机进气的复合消声装置，其特征在于：所述穿孔板(801)的厚度为2mm～5mm。A high-speed centrifugal fan air intake compound muffler device according to claim 9, characterized in that the thickness of the perforated plate (801) is 2mm-5mm.
PCT/CN2020/101457 2020-06-22 2020-07-10 Composite air intake muffler device for high-speed centrifugal fan WO2021258432A1 (en)

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CN109505808A (en) * 2018-12-25 2019-03-22 广东美的白色家电技术创新中心有限公司 Fans silencer and fan noise elimination system
CN114412840A (en) * 2021-12-31 2022-04-29 中国航空工业集团公司西安飞机设计研究所 Combined type fan inlet silencer with low flow resistance and large noise reduction amount

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CN109505808A (en) * 2018-12-25 2019-03-22 广东美的白色家电技术创新中心有限公司 Fans silencer and fan noise elimination system
CN114412840A (en) * 2021-12-31 2022-04-29 中国航空工业集团公司西安飞机设计研究所 Combined type fan inlet silencer with low flow resistance and large noise reduction amount

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