CN110259731A - 一种降低隧道施工轴流通风机噪音的方法 - Google Patents

一种降低隧道施工轴流通风机噪音的方法 Download PDF

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CN110259731A
CN110259731A CN201910663824.XA CN201910663824A CN110259731A CN 110259731 A CN110259731 A CN 110259731A CN 201910663824 A CN201910663824 A CN 201910663824A CN 110259731 A CN110259731 A CN 110259731A
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impeller
hush pipe
noise
constructing tunnel
propeller fan
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李旭东
谢世伟
李梅
李飞
李有勤
李卓林
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SHANXI PROVINCE HOUMA CITY XINFENGKANG FAN CO Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00Axial-flow pumps
    • F04D19/002Axial flow fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/02Selection of particular materials
    • F04D29/023Selection of particular materials especially adapted for elastic fluid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329Details of the hub
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38Blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/58Cooling; Heating; Diminishing heat transfer
    • F04D29/582Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5853Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/64Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646Mounting or removal of fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663Sound attenuation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663Sound attenuation
    • F04D29/664Sound attenuation by means of sound absorbing material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00Manufacture
    • F05D2230/20Manufacture essentially without removing material
    • F05D2230/23Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232Manufacture essentially without removing material by permanently joining parts together by welding
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00Manufacture
    • F05D2230/20Manufacture essentially without removing material
    • F05D2230/23Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232Manufacture essentially without removing material by permanently joining parts together by welding
    • F05D2230/235TIG or MIG welding
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00Materials; Properties thereof
    • F05D2300/10Metals, alloys or intermetallic compounds
    • F05D2300/17Alloys
    • F05D2300/171Steel alloys

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  • Engineering & Computer Science (AREA)
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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

一种降低隧道施工轴流通风机噪音的方法,目的是能长时间运行平稳,振动速度小,可有效降低噪音;本发明目的通过以下措施来实现:增加轴流式通风机进气消音筒和出气消音筒的长度;使轴流式通风机进气消音筒和出气消音筒长度达到叶轮直径的1.5‑2倍;消音材料采用超长超细纤维玻璃丝棉,其厚度为100‑110mm,以更好的杜绝空气的对流传热,进一步降低噪音;叶片采用不锈钢316材质加工制成,该材质叶片重量轻,强度高,可直接降低叶轮高速旋转气流产生的噪音;将轮毂辐板位置移至环板中心位置,环板和轮毂辐板之间通过二氧化碳气体保护焊接方式连接固定,以加强轮毂环板强度。

Description

一种降低隧道施工轴流通风机噪音的方法
技术领域
本发明涉及一种降低隧道施工轴流通风机噪音的方法。
背景技术
轴流式通风机是目前市场上最常用的一种通风送风设备,其气体平行于风机轴流动,也就是与风叶的轴同方向的气流,如电风扇、空调外机风扇,就是轴流方式运行风机,轴流式通风机固定位置并使空气移动,轴流式通风机通常用在流量要求较高而压力要求较低的场合,广泛应用于隧道、地铁、引水工程等通风送风作业。但目前市场上常见的一些轴流式通风机还存在着高噪音问题,特别是居民区附件施工时,会严重污染周边的声环境,给附近居民生活造成不良影响。如何降低轴流式通风机的高噪音污染,是一个迫切需要解决的问题。
发明内容
本发明目的就是克服上述已有技术的不足,提供一种能够长时间运行平稳、振动速度小的可有效降低隧道施工轴流通风机噪音的方法。
本发明方法是:
(1)加长轴流式通风机进气消音筒和出气消音筒的长度;使轴流式通风机进气消音筒和出气消音筒长度达到叶轮直径的1.5-2倍;其中:轴流式通风机在叶轮直径1400mm以下时,进气消音筒、出气消音筒长度按照接近叶轮直径的2倍进行选择;叶轮直径正好在1400mm时,进气消音筒和出气消音筒长度均为叶轮直径的1.75倍;轴流式通风机在叶轮直径1400mm以上时,进气消音筒、出气消音筒长度按照接近叶轮直径的1.5倍选择。
例如:轴流式通风机SDF-№16,该通风机的机号为№16,叶轮直径为1600mm,进气、出气消音筒的长度分别为1.5×1600=2400mm。
(2)改进消音材料并增加消音材料厚度;消音材料由原来的矿棉材料改为超长超细纤维玻璃丝棉,该玻璃丝绵内部纤维细长,能快速衰减声音的传输,同时很好地禁锢空气,使之无法流动,杜绝了空气的对流传热,从而起到吸声和保温的功效。消音材料厚度由原来的85mm增加至100-110mm,加厚消音材质可进一步降低噪音;
(3)改进叶片材质;叶片材质由铁叶片改为不锈钢316叶片,该叶片重量轻,强度高,可以直接降低叶轮高速旋转气流产生的噪音。
(4)改进风机叶轮结构,加强轮毂环板的强度;将辐板位置移至环板中心位置,环板和辐板通过二氧化碳气体保护焊接方式连接,以加强轮毂环板强度;因叶片在高速旋转时有很大的离心力,每个叶片的叶芯均在环板中心位置,将轮毂辐板由原来在环板的的侧边移至环板的中间位置,加强了轮毂环板的强度。
此外,将风机叶轮内筒体经过精密加工,减小叶轮和内筒体机壳之间径向单侧间隙,其径向单侧间隙应在叶轮直径的0.15%~0.35%范围内,不得小于1mm;使通风机叶轮与机壳之间的径向间隙均匀。一般的,单侧间隙为1-2mm,效果较佳。
例如:若通风机机号为№18(叶轮直径1800mm),其叶轮与机壳之间的径向间隙通常是在2.7-6.3mm。而本发明通风机叶轮与机壳之间的径向单侧间隙可以缩减为到1-2mm,不仅提高了风机整体效率,还能进一步降低风机噪音。
叶片是风机叶轮的核心部位,叶片固定在轮毂上,且叶片角度可调。环板和轮毂辐板都采用Q235钢板材料加工成型然后焊接而成。一般的,因叶片形状的改变轮毂面需加宽,不同型号风机轮毂的环板和轮毂辐板所需钢板的厚度不同。为提高风机性能,风机叶轮的轮毂比(轮毂直径与叶轮直径之比)由原来的0.6变为0.69,经现场实验证明,在同等条件下,轮毂比0.69相对轮毂比0.6的性能更高。
为提高风压,叶片叶型宽度需更大,扭曲度也更大,为增加叶片根部的叶片强度,叶芯由原来单独金属螺杆改为底部圆盘形结构设计。一级和二级叶轮的叶片数目由原来的15片、11片分别减少为现在的10片和8片,以进一步降低噪音并减少生产成本。为提高叶片的强度、减少风机噪音,叶片的材质由金属材质改为316不锈钢。所述电机采用变频风机,还可节电。
本发明方法适用于制造或改造各种隧道施工SDF系列型号的轴流式通风机,特别是针对叶轮直径1000mm-2000mm、型号为SDF-№10--SDF-№20的轴流通风机。隧道施工用轴流通风机通过本发明工艺改进,可达到良好的降噪效果,风机长时间运行平稳,噪音完全能够满足小于JB/T8690-1998《工业通风机噪声限值》标准规定值,在最佳效率工况点的A声级噪声达到75dB(A),轴流通风机≤35dB。振动速度有效值符合JB/T 8689-2014《通风机振动检测及其限值》的3.1.2 在所规定的的各个测量方向和测点上,测得的振动速度方均根值不应超出规定:刚性支撑:νrms≤4.6mm/s,叶轮动平衡等级达到G6.3级。
附图说明
图1为叶轮与筒体安装结构示意图;
图2为主机筒体结构示意图;
图中:1.叶片,2.内筒体,3.消音材料,4.电机,5.环板,6.轮毂辐板,7.叶芯,8.外筒体,9.叶轮。
具体实施方式
本发明方法具体内容是:
(1)加长轴流式通风机进气、出气消音筒长度至叶轮9直径的1.5-2倍;轴流式通风机在叶轮9直径1400mm以下时,进气、出气消音筒长度分别选用接近叶轮直径的2倍;叶轮9直径正好在1400mm时,进气消音筒和出气消音筒长度均为叶轮直径的1.75倍;轴流式通风机在叶轮9直径1400mm以上时,进气、出气消音筒长度分别选用接近叶轮直径的1.5倍。例如:轴流式通风机SDF-№16,该通风机的机号为№16,叶轮直径为1600mm,进气、出气消音筒的长度为1.5×1600=2400mm。
(2)改进消音材料3,消音材料3由原来的矿棉改为超长超细纤维玻璃丝棉,该玻璃丝绵内部纤维细长,能快速衰减声音的传输,同时很好地禁锢空气,使之无法流动,杜绝了空气的对流传热,从而起到吸声和保温的功效。增加消音材料3厚度,厚度由原来的85mm增加至100-110mm,加厚消音材质可进一步降低噪音;
(3)改进叶片1材质,叶片1材质由铁叶片改为不锈钢316叶片,该叶片1重量轻,强度高,可直接降低叶轮高速旋转气流产生的噪音。
(4)改进风机叶轮9结构,加强轮毂环板5的强度,将轮毂辐板6位置移至环板5中心位置,环板5和轮毂辐板6通过二氧化碳气体保护焊接方式连接固定,以加强轮毂环板强度;
此外,将风机叶轮9毗邻的内筒体2经过精密加工,减小叶轮9和内筒体2机壳之间径向单侧间隙,其径向单侧间隙控制在叶轮9直径的0.15%-0.35%范围内,不得小于1mm;使通风机叶轮与机壳之间的径向间隙均匀。
叶轮9与内筒体2机壳之间的径向单侧间隙可缩减为到1-2mm,不仅提高了风机整体效率,还能进一步降低风机噪音。
所述环板5和轮毂辐板6均采用Q235钢板加工成型然后焊接而成。

Claims (8)

1.一种降低隧道施工轴流通风机噪音的方法,其特征是:
(1)增加轴流式通风机进气消音筒和出气消音筒的长度;使轴流式通风机进气消音筒和出气消音筒长度达到叶轮直径的1.5-2倍;
(2)消音材料采用超长超细纤维玻璃丝棉,其厚度为100-110mm,以更好的杜绝空气的对流传热,进一步降低噪音;
(3)叶片采用不锈钢316材质加工制成,该材质叶片重量轻,强度高,可直接降低叶轮高速旋转气流产生的噪音;
(4)将轮毂辐板位置移至环板中心位置,环板和轮毂辐板之间通过二氧化碳气体保护焊接方式连接固定,以加强轮毂环板强度。
2.如权利要求1所述的降低隧道施工轴流通风机噪音的方法,其特征是叶轮直径在1400mm以下时,进气消音筒和出气消音筒长度分别按照接近叶轮直径的2倍进行选择;叶轮直径正好在1400mm时,进气消音筒和出气消音筒长度均为叶轮直径的1.75倍;叶轮直径在1400mm以上时,进气消音筒、出气消音筒长度分别按照接近叶轮直径的1.5倍选择。
3.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是所述叶轮叶片和内筒体之间径向间隙均匀,单侧间隙在叶轮直径的0.15%--0.35%范围内,且不小于1mm。
4.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是所述叶轮叶片和内筒体之间径向间隙均匀,单侧间隙为1-2mm。
5.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是风机叶轮的轮毂直径与叶轮直径之比为0.69,可进一步提高风机性能。
6.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是所述叶芯为底部圆盘形结构,以增加叶片根部的叶片强度。
7.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是所述环板和轮毂辐板均采用Q235钢板加工成型然后焊接而成。
8.如权利要求1或2所述的降低隧道施工轴流通风机噪音的方法,其特征是一级和二级叶轮的叶片数目分别减少至10片和8片,以进一步降低噪音并减少成本。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111219350A (zh) * 2020-01-09 2020-06-02 中铁第十八工程局涿州水泵厂 一种风机环境参数的换算方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346174A (en) * 1966-07-05 1967-10-10 Trane Co Compact axial flow fan
CN201461470U (zh) * 2009-07-22 2010-05-12 哈尔滨航飞工业机械有限公司 矿用隔爆型压入式对旋轴流局部通风机
CN202209311U (zh) * 2011-08-09 2012-05-02 安徽安风风机有限公司 一种轴流式通风机叶轮
CN103629163A (zh) * 2013-11-29 2014-03-12 淮北兴海工贸有限责任公司 矿用隔爆型压入式对旋轴流局部通风机低噪音消音机壳
CN103821742A (zh) * 2014-03-18 2014-05-28 中国汽车技术研究中心 室内车辆试验用低噪声迎面风机
CN106762759A (zh) * 2017-03-16 2017-05-31 贵州大学 一种集防爆消声于一体的智能调速局部通风机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346174A (en) * 1966-07-05 1967-10-10 Trane Co Compact axial flow fan
CN201461470U (zh) * 2009-07-22 2010-05-12 哈尔滨航飞工业机械有限公司 矿用隔爆型压入式对旋轴流局部通风机
CN202209311U (zh) * 2011-08-09 2012-05-02 安徽安风风机有限公司 一种轴流式通风机叶轮
CN103629163A (zh) * 2013-11-29 2014-03-12 淮北兴海工贸有限责任公司 矿用隔爆型压入式对旋轴流局部通风机低噪音消音机壳
CN103821742A (zh) * 2014-03-18 2014-05-28 中国汽车技术研究中心 室内车辆试验用低噪声迎面风机
CN106762759A (zh) * 2017-03-16 2017-05-31 贵州大学 一种集防爆消声于一体的智能调速局部通风机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111219350A (zh) * 2020-01-09 2020-06-02 中铁第十八工程局涿州水泵厂 一种风机环境参数的换算方法

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