离心通风机
Centrifugal Fan
4-72-11 B4-72-11
Type 4-72-11 B4-72-11
使用说明书
Operation Instruction
用 途
4－72－11型离心通风机（以下简称风机）是一种低中压风机，它使用范围很广，压力曲线平坦，便于安装和维修，造价低廉，在风机名目繁多、群星汇萃的今天，4－72－11型风机仍不失为风机的“中流砥柱”，它主要承担一般工厂、仓库。高层建筑、地下铁道等大型建筑物的通风换气，并经常出现在如北京地铁——这些人涌如潮、众命尤关的主要和关键场合。它既可以输出气体，也可以输入气体，但被输送气体必须是空气或其它不自燃。
不挥发、不易爆、对钢材无腐蚀性、对人体无害之气体，气体内不得含粘性物质，所含尘土及硬质颗粒物在被输送气体中所占比例不得超150mg／m3，而且被输送气体之温度不得超过80C。
B4－72－11型离心通风机又称防爆离心通风机（以“B”表示），则可输送易燃、易爆易挥发气体，其空气性能、外形尺寸、地基尺寸、内部结构均与同一机号的 4－72－11完全相同，但是动力须改为防爆电机，叶轮应用铝材制造，以防万一因叶轮歪斜而与机壳摩擦起火，开关应该用防爆开关或开关远离易爆点，以防开关打火引爆。在易爆区内所有电线不许有接头，以防“虚接”起火，电线应装在铁管内。
B4－72－11型离心通风机经常用在矿山、隧道、化工等场合。
F4－72－11型离心通风机则可输送对钢铁有腐蚀性，对人体有害及含毒之气体，这种风机凡可能与被输送气体接触之部件，如：机壳、叶轮、进风口、出风口等均应用抗腐蚀性材料，如不锈钢、玻璃钢以及其他抗腐蚀材料制造。其空气性能、外形尺寸、地基尺寸、内部结构、动力等与同一机号的4－72－11完全相同。它经常应用在化工厂、镀锌厂、化肥
厂等重要场合。
型 式
在一般情况下，4－72－11型离心通风机有2.8A、3.2A、3.6A、4A、4.5A、5.6A、6A、6C、6D、8C、8D、10C、10D、12D、16B、20B共13个机号，18个品种。其中任何一个机号的任何一种传动，皆可作成“左”旋或“右”旋两种型式。从电机一端正视叶轮，凡顺时针旋转者皆称“右旋风机”，以“右”表示，反之皆称“左旋风机”，以“左”表示。
风机的出风口位置以机壳的出风口角度表示，其中：№8～6A在出厂时均做成一种型式，使用单位根据要求再安装成所需要的位置，订货时无须注明。
特别注意：①№2.8A出风口调整范围是0°～225°，间隔是45°；
②№3.2A～6A、6C、6D出风口调整范围是0°～225°，间隔是22.5°；
③№8D～10C、D出风口调整范围是0°～180°间隔是45°；
④№12C、D出风口调整范围是0°～180°，间隔是15°；
⑤№l6B、20B出风口角度制成0°、90°、180°“固定的三种，不能调整，订货时须注明用哪一种。
⑥上述出风口角度是风机行业的习惯做法，如这些做法不能满足您的具体使用环境和条件，我厂可以为您做成令您满意的角度，出现这种情况时，本说明书后边的安装尺寸表可能会有所变动，望用户注意。
风机的传动方式为有A、B、C、D四种：
A一表示风机轴盘通过键槽安装在电机轴伸上，即电机直插；
B一表示悬臂支承装置，皮带传动，皮带轮在两轴承中间；
C一表示悬臂支承装置，皮带传动，但是皮带轮在轴承外侧；
D一表示悬臂支承装置，用联轴器联接驱动。
在风机行业的习惯性做法中，4－72－11№2.8～5做成A式，№6既有A式，也有C式和
D式，№8～12既有C式，也有D式，№16、20仅有B式。
这些传动方式一般均能满足用户的使用要求，当万一不能满足您的要求时，我厂有实力设计和生产使您满意的风机。
结 构
风机一般主要由叶轮、机壳、进风口和传动部分组成，但№2.8～6A为A式传动，无传动组。
叶 轮 一 它是风机的核心部件，它的材质和型线决定了一台风机的风压、风量。能耗、噪声和寿命。本风机由十个后倾的机翼型叶片、曲线型轮盖和平板后盘组成，根据不同用途和介质用普通钢板、16锰钢、不锈钢或玻璃钢制造，经动静平衡校正和超速运转实验，运转平稳可靠，空气性能良好。
机 壳 一 机壳做成两种不同型式，其中：№2.8～12机壳做成整体，不能拆开。№16～20机壳沿水平做成上下两开式，上半部沿中心线垂直分为两半，用螺栓连接，主要是考虑便于拆卸、维修和移动，具体材质根据风机的用途或普通铁板焊成，或用不锈钢焊成，或用玻璃钢加工而成，当然工艺、造价和工期也随之不同。
进风口 一 进风口制成整体结构，它与轴向平行的截面为曲线形状，便于气体顺利进入叶轮且损失较小，进风口通常用螺栓固定于风机一侧。进风口与叶轮在径向和轴向间隙太小了稍有不慎会造成摩擦，太大时会造成漏风，影响效率，请保证设计尺寸。
传 动 一 传动部分由主轴、轴承箱、滚动轴承、皮带轮或联轴器组成。
性能
风机的性能通常用流量、全压、主轴转速、轴功率、效率等参数表示，这些参数间
有一定的换算关系，其关系可用性能曲线，数学公式或表格等方式表示；
如果设 Q 一 流量 m3/h； H 一 全压 Pa；
N 一 轴功率 kW； η一 全压效率
ηm一 机械效率 ％； r 一 比重 kg/ m3；
n 一 主轴转数 r／min； t 一 温度 ℃
式中：
带注脚“2”的表示已知性能参数，带注脚“1”的表示未知性能参数。
那么
风机性能一般均指标准状况下的性能，当使用状况与标准状况不符时须把此时的性能换算
成标准状况下的性能，然后再查性能表选择机号和转速。所谓注标准状况是指：
大气压力P＝101325 Pa 自由落体加速度g＝9．8 m／sec2
空气密度 ρ＝0.1223 kg·se c2／m4 大气温度 t＝20℃
所需功率按下式求出：N＝10-3η-1·K ·Q·H 相对湿度＆＝50％
A、D、C各种传动效率值
传动方式 机械效率ηm
A 电机直联
D 联轴器
C 皮带传动
K值的选取
电机功率kW K值
0.5以下
>0.5～1
>1～2
>2～5
>5 1.5
1.4
1.3
1.3
1.15
流量 的调 节
在使用时，常常发生流量过多或不足的现象，产生这种现象的原因很多，如果是在使
用过程中发生流量时大时小的现象，主要是由于管网中阻力时大时小或风机在飞动区工作
的缘故；如果是在使用过程中经过较长时间逐渐减少或在短时间内突然减少，则主要是由
于管网堵塞。
在风机新安装后，进行正式试运转时就发生流量过大或不足现象，产生这种现象的原因主要有下列几点：
1．管网阻力实际值与计算值相差过大。
一般管网特性方程式为：
H＝K·Q2 式中：K一 阻力系数
如实际值K小于计算值K时，则流量增大；若实际值K大于计算值K时则流量减少，见图1（b）。
2．选择时未考虑风机本身全压值偏差aH的影响，当风机实际全压为正偏差时，则流量增大；为负偏差时，则流量减少，见图1（a）。
Fig. Pipe net characteristic curve
在风机新安装后开始正式运转时或在使用过程中发生流量过大或过小时，可采用下列方法之一消除之：
（1）利用节流装置的启闭度以调节流量。
（2）利用增减风机的转速以增减流量。
（3）利用调换新的压力较高或较低的风机以增减流量。
（4）改变管网使管网阻力系数K减小或增大流量。
必须指出的是：一般都是采用节流装置来调节流量，但当实际流量比需要流量大的很多时，这种方法浪费电力过多，很不经济，如果条件允许时，通常采用降低风机转速或调换压力较低的风机。
当节流装置全开时，流量仍嫌过小，此时节流装置己失去节流作用，故应设法减小管网阻力系数以增加流量，也可采用增高风机的转速和调换压力较高风机，但电动机直联和联轴器直联的风机一般都不能改变转速，只有皮带传动的风机可借改变皮带轮直径的大小以增减转速，切记风机的最大转速不得超过性能与选用件表之最高转速。
说明：（1）Ng10、12、16、20按Ng10模型的无因次性能换算。
2）Nils、6、8按Nd模型的无因次性能换算。
（3）Ngs以下按实测样机性能确定。
无固次性能曲线换算为有因次的计算公式为：
全 压 H＝p·V“·H（Pa）
流 量
轴功率 (kW)
式中：D一叶轮外径（m）u一叶轮外圆线速度（。／s）0一气体密度（ks／m’）
所需功率等于轴功率另加机械损失和电机储备量。
安装与使用
在安装前首先应准备好材料和工具，对风机各部机件进行全面核对，对叶轮、机壳、主轴和轴承等机件更应特别细致检查，如发现损伤，应予修复，然后用煤油清洗轴承箱内部。
在进行固定操作过程中必须注意以下几点：
1.在一些接合面上，为了防止生锈，减少拆卸困难起见，应涂上一层润滑油或机械油。
2．在上接合面的螺栓时，如有定位销钉应先上好销钉，再拧紧螺栓。
3．检查机壳内及其它壳体内部，不应有掉入和遗留的工具或杂物。
安装时的具体要求是：
1． 安装时，严禁儿童、老人、残疾人等行动不便者或无关人员在场围观。
2．按先安装风机，后接通电源的次序进行。
3．安装风机时，输气管道的重量不应加在机壳上。
4．按图纸校正进风口与叶轮之间间隙尺寸，而且保持轴的水平度。
5．安装进风口管道时，可以直接利用进风日本身的螺栓进行连接，此时进风口固定是靠三个沉头螺钉。
6．安装Nil6D～Ng12D式风机时，利用千分表和塞尺，测量风机主轴和电机轴的同轴度及联轴器两端平行度。两轴同轴度允差为0．05nun。联轴器端面平行度允差为0．Inun。
7．风机安装完后，用手或杠杆拨动转子，检查是否有过紧或刮蹭等现象。在无过紧或刮蹭的情况下方可进行试运转。
8．电动机安装后，安装皮带轮或联轴器防护罩，如进气口处不接进气管道时，也需加防护网或其它安全装置（用户自备）。
其它部件，按图纸对应位置进行安装。
由于风机的流量Q、全压H、主轴转数n、轴功率N四者有固定关系：
因此在电动机容量不改变时，主轴转速不宜更改，若主轴转速增大，电动机则有因过载被烧之危险。
通风机所采用的电机功率，系指在特定的工况下，轴功率加上机械损失与应有的储备量而言，并非出风日全开时所需功率，如风机的出口或入口不接管路或未加外界任何阻力而进行空转，则电机亦有被烧之危险。为安全起见，应在风机的出口或入口管路中加装阀门，起动电机时将其关闭，运转后将阀门慢慢开启，直至规定工况，并注意电流是否超标。
维 护
l、风机不许带病运行。
2、风机的维护和修理必须在停机断电、风机确实停稳后进行。
3、维护人员不许随意更换，应保持相对的稳定，最好专人使用，专人维护。
4、在修理风机时电机开关须有专人监护或上锁。
5、定期清除风机及管道内部的灰尘、污垢及水等杂质，并防止锈蚀。
6、对温度计及油标的灵敏性应定期检查。
7、除每次拆修后更换润滑油外，还应定期更换润滑油。
A、D、C各种传动效率值
传动方式 机械效率ηm
A 电机直联
D 联轴器
C 皮带传动 1.00
0.98
0.95
K值的选取
电机功率kW K值
0.5以下
>0.5～1
>1～2
>2～5
>5 1.5
1.4
1.3
1.3
1.15
故障原因一览表
故障 原因
轴承箱体
振动剧烈 1．风机轴与电机轴不同心，联轴器歪斜。
2．机壳或进风口与叶轮摩擦。
3．基础的刚度不够或不牢固。
4．叶轮铆钉松动或轮盘变形。
5．叶轮轴盘与轴松动，联轴器螺栓活动。
6．机壳与支架、轴承箱与支架、轴承箱盖与座等联按螺栓松动。
7．风机进、出气管道的安装不良，产生振动。
8．转子失衡。
轴承温
升过高 1．轴承箱振动剧烈。
2．润滑脂质量不良、变质或填充过多和含有灰尘、粘砂、污垢等杂质。
3．轴承箱盖、座联接螺栓之紧力过大或过小。
4．轴与滚动轴承安装歪斜，前后两轴承不同心。
5．滚动轴承损坏。
电动机电
流过大和
温升过高 1．开车时进气管道内闸门或节流阀未关严。
2．流量超过规定值或风管漏气。
3．风机输送之气体密度过大或含粘性物质。
4．电动机输入电压过低或电源单相断电。
5．联轴器联接不正，皮圈过紧或间隙不匀。
6．受轴承箱振动剧烈的影响。
7．受并联风机工作情况恶化或发生故障的影响。
皮带滑下 两皮带轮子位置彼此不在一中心线上，使皮带从小皮带轮上滑下。
皮带跳动 两皮带轮距离太近或皮带过长
Centrifugal Fan
Type 4-72-11 B4-72-11
Operation Instruction
表 头 中 的 中 英 文 对 照
Performance and Optional Part Table of Centrifugal Fan………离心风机性能与选用件表
Speed……………………………………………………………转速
Driving Mode……………………………………………………传动方式
No.………………………………………………………………序号
Flow………………………………………………………………流量
Total Pressure……………………………………………………全压
Inner Effic..………………………………………………………内效率
Inner Power………………………………………………………内功率
Req. Power………………………………………………………所需功率
Motor……………………………………………………………电动机
Type………………………、……………………………………型号
Power……………………………………………………………功率
Triangle Belt………………………………………………………三角带
Anchor Bolt………………………………………………………地脚螺栓
Nut.………………………………………………………………螺母
Washer.…………………………………………………………垫圈
I.C.………………………………………………………………内周长
Shaft Pulley………………………………………………………主轴皮带轮
Code………………………………………………………………代号
Size………………………………………………………………规格
Motor Pulley………………………………………………………电机皮带轮
Motor Rail…………………………………………………………电机导轨
（Set）………………………………………………………（套）
Installation and Overall dimension of Centrifugal fan…………离心通风机安装及外形尺寸
Machine No. …………………………………………………机号
Intake…………………………………………………………进风口
Discharge…………………………………………………… 出风口
Connecting Bolt………………………………………………连接螺栓
Size……………………………………………………………规格
Quant. ………………………………………………………数量
Bolt Hole………………………………………………………螺栓孔
Dia. …………………………………………………………直径
Distance………………………………………………………间距
Installation and Overall dimension……………………………安装及外形尺寸
Impeller Weight………………………………………………叶轮重量
Fan Weight（Motor Excl）…………………………………风机重量（不包括电机）
Motor Weight…………………………………………………电动机重量
Installation……………………………………………………安装
Right，……………………………………………………………右
Purpose
Type 4-72-11 centrifugal fan (below calls fan) is a kind of low and middle pressure fan, it has a wide service range, flat pressure curve, facilitate to install and repair, and low in price. In the current, there are multitude of items for fan, Type 4-72-11 is still ”a firm rock in mainstream ” of fan, it undertakes the ventilation of general factories, warehouses, high buildings and subways etc. and often appears on the main occasion such as Beijing Subway, it can output or input gas, but the gas handled by fan must be air or other gas which is non-inflammable, non-volatile, non-explosive, non-corrosive to steel and harmless to the people, visco-material shouldn’t be contained in the gas. Dust and hard particle content in the gas is not greater than 150 mg/m3, the gas temperature shall not exceed 80℃.
Type B4-72-11 centrifugal fan also calls explosion proof centrifugal fan (symbolized with “B”), can handled combustible, explosive and volatile gases, its aerodynamic performance, overall dimension, foundation dimension and internal structure are the same as Type 4-72-11, but power must be changed to explosion proof motor power, impeller is made of aluminium in order to prevent impeller friction with casing to catch fire, explosion proof switch is used and it must be far a way from the explosive point in order to prevent switch striking sparks and igniting. In the explosive area, all wires must not have connector in order to prevent virtual connection and catch fire, wire should be installed into iron pipe.
Type B 4-72-11 centrifugal fan is usually used in mine, tunnel and chemical industry.
Type F 4-72-11 centrifugal fan can handle the gas which is corrosive to iron and steel, harmful to people and toxic.
All parts, such as casing, impeller, inlet are made of corrosion resisting materials, such as stainless steel, glass fiber reinforced plastics and other corrosion resisting materials. Its aerodynamic performance, overall dimension, foundation dimension, internal structure and power are the same as Type 4-72-11. It often appears on the main occasions of chemical industry plant, zinc plating plant and chemical fertilizer plant etc.
Type
In normal condition, type 4-72-11 centrifugal fan has 13 different sizes and 18 varieties, they are 2.8A, 3.2A, 3.6A, 4A, 4.5A, 5.6A, 6A, 6C, 6D, 8C, 8D, 10C, 10D, 12D, 16B, 20B. One of them can be made of two types rotation i.e. right and left, viewing from one end of the motor, it is called as clockwise fan if the impeller rotates clockwise, and symbolized with “right”, on the contrary, it is called as counter clockwise fan if the impeller rotates counter clockwise, and symbolized with “left”. The outlet position of the fan can be expressed from the outlet angle of the casing, among them, No. 2.8～6A is made of a kind of angle 0°, user can change the angle according to the requirement, without note when ordering.
Special note: 1.Adjustment of angles for No. 2..8A outlet is 0°～225°, the interval is 45°;
2.Adjustment of angles for No. 3.2A～6A, 6C, 6D outlets is 0°～
225°, the interval is 22.5°;
3.Adjutment of angles for No. 8D～10C, D outlets is 0°～180°, the interval is 45°;
4.Adjustment of angles for No. 12C, D outlets is 0°～180°, the interval is 15°;
5.No. 16B, 20B outlets can be made three kinds of angles which are
0°,90°,180°and can not be adjusted, note when ordering.
6.The mentioned outlet angles is the customary doing of the fan trade, if they can’t meet your specific environment and condition, our factory can manufacture satisfactory angles for you, if this situation occurs the installation dimension behind the manual may be changed, users should take notice.
There are 4 driving modes: A,B, C, D:
A— Shaft disc of fan is installed on motor shaft by keyway, i.e. motor directly connecting;
B—Cantilever bearing unit, belt driving, pulley is in the middle of two bearings;
C—Cantilever bearing unit, belt driving, but the pulley is outside the bearing;
D—Cantilever bearing unit, coupling directly driving.
In the fan trade customary doing, type 4-72-11 No. 2.8～5 take mode A, No. 6 takes modes A, C and D, No. 8～12 take modes C and D, No. 16, 20 take only mode B.
Generally these driving modes can meet users operating requirement, if they can’t meet your requirement, our factory has ability to design and manufacture satisfactory fan for you.
Structure
The fan mainly consists of impeller, casing, inlet and driving unit, but No. 2.8～6A is mode A driving, and without driving unit.
Impeller—it is the key part of the fan, its material and contour can determine the wind pressure, flow rate, power consumption, noise and service life. The impeller consists of 10 backward wing blades, a curved front disc and flat rear disc, they are made up of steel plate, 16 Mn stainless steel or glass fiber reinforced plastics according to the various purpose and medium, the impeller shall be balanced statically and dynamically, over speed running test is carried out, and thus it has smooth running and the aerodynamic performance is good.
Casing—it shall be made two kinds of different types, among them: No. 2.8～12 casing is made in integral type, it can not be disintegrated. No.16～20 casing is made in three-open type, besides the casing is divided into two parts along the split horizontal level, the upper casing is vertically divided into two parts again along the centerline, and they are fixed by bolts, and thus facilitate to disassembly, repair and move. It is welded with normal iron plate or stainless steel, or machined with glass fiber reinforced plastics according to the purpose of the fan, however technology, price and schedule are also different.
Inlet—the inlet is manufactured as an integral type, the section which is parallel to the shaft is curved forms and gas is allowed into the impeller smoothly with a little loss, the inlet is generally fixed on the side of the fan with bolts. Radial and axial clearances between inlet and impeller are too small, friction can be caused between them, and when the clearances are too big, air leakage can be caused between them, please keep the design dimensions.
Driving unit—it consists of shaft, bearing box, rolling bearing, belt pulley or coupling.
Performance
The Performance of the fan is symbolized by flow, total pressure, speed, power, efficiency and Parameters etc.. there are certain conversional relations between these parameters, the relation can be shown by performance curve, mathematical formula and form mode etc;
Q—Flow rate m3/h; H—total pressure Pa;
N—Shaft power kW η—total pressure efficiency
ηm—mechanical efficiency % r—specific gravity kg/m3
n—speed r/min; t—temperature ℃
where:
with footnote 2 symbolizes the known parameter,
with footnote 1 symbolizes the unknown parameter.
then:
The performance of the fan normally indicates the performance under the standard state. When the operating condition is inconsistent with standard state, at this moment the Performance must be converted into the performance under the standard state. The so-called standard slate indicates: atmospheric pressure P=101325 Pa, acceleration of gravity g=9.8m/sec2, air density ρ=0.1223kg·sec2/m4, atmospheric temperature t=20℃, the required power N=10-3η-1·K·Q·H, the relative humidity &=50%.
A、D、C driving efficiency value
driving mode Mechanical
efficiencyηm
A motor driving
D coupling driving
C belt driving 1.00
0.98
0.95
Selection of value k
motor power (kW) value k
below 0.5
>0.5～1
>1～2
>2～5
>5
1.5
1.4
1.3
1.3
1.15
Adjustment of Flow rate
The phenomenon of flow excess or insufficient often occurs in operation, there are many reasons in occurring such phenomenon. If the phenomenon of flow rate sometimes great and sometimes little occurs during operation, the main reason is due to resistance in pipe net sometimes strong and sometimes weak. If it is gradually reduced through a long period or suddenly reduced within a short time, the main reason is that the fan passage or pipe net is pl ed. The phenomenon of flow excess or insufficient will occur during normal running after installing, the main reason is as follows:
1.The actual and theoretic values k of resistance in pipe net is widely different. It was known normal pipe net characteristic equation H=KQ2, where: k is the coefficient of resistance, if the actual value k is less than the theoretic value k, the flow rate increases; vice versa, flow rate decreases, see Fig. 1 (b)
2.The effect of fan total pressure deviation △p have not been considered during selecting. when the actual total pressure of fan is a positive deviation, the flow rate increases, and when it is a negative deviation, the flow rate decreases, see fig 1 (a).
Fig.1 Pipe net characteristic curve
The flow rate excess or in sufficient occurred after fan newly installing and putting into operation, one of the following methods can be used to eliminate:
(1) Flow rate can be adjusted by damper.
(2) Increasing or decreasing the speed of the fan.
(3) Changeover a higher or lower pressure fan.
(4) Changeover pipe net to reduce the coefficient k of resistance.
It must be pointed out: flow rate is normally adjusted by damper, but when the actual flow rate is much greater than the required, it wastes power, it is not economical, if the condition permits reducing fan speed or changing-over a lower pressure fan is normally used.
When the damper is full open, the flow rate is still insufficient, at this moment, the damper has lost its function, so try to reduce the resistance coefficient of pipe net, or increase the speed of the fan, or change-over a higher pressure fan, but the fan driven by motor and coupling can not be normally changed the speed, only the fan driven by belt, the speed can be increased and decreased by the means of changing the size of belt pulley diameter, the max. speed must be lower than the performance and optional part table required.
Note:
(1) No. 10,12,16 and 20 is converted according to the non-dimensional performance of No. 10 model.
(2) No. 5, 6 and 8 is converted according to the non-dimensional performance of No. 5 model.
(3) No. 5 below is determined by the actual testing sample fan performance.
The dimensional formula which converted by non-dimensional performance curve is :
Total pressure (Pa)
Flow rate
Power (kW)
Where:
D—outer diameter of impeller (m) μ—linear velocity of impeller outer circle (m/s) ρ—air density (kg/m3)
The required power is equal to shaft power plus mechanical loss and motor storing quantity.
Installation and Operation
First, prepare attachment and tools before installation, then, check every parts of the fan, impeller, casing , shaft and bearing etc. should be inspected carefully, if damages are found, repair should be carried out, and then clean inside of the bearing box with kerosene.
The following points must be noted during installation:
1. Lubricating oil or mechanical oil should be coated on the joint surface in order to prevent rust.
2. When the bolt is screwed in the joint surface, if there are setting dowels, doweling the joint surface first, and then tighten the bolt.
3. Pay attention to check the casing and any tools or goods should not be dropped and remained inside the casing.
Requirements of installation:
1. During installation, prohibit children, old people, disabled person and the persons who has difficulty getting about a bit on the installing site to surround and watch.
2. Install the fan first and then switch on power supply.
3. During installation, the weight of air duct should not added on the casing of the fan.
4. Correct the dimensions between the impeller and the inlet according to the drawing, keep the horizontality of the shaft.
5. When installing the inlet pipe, the bolt of inlet is directly used to connect pipe, at this time the inlet is fixed by three countersunk screws.
6. During installing No. 6 D～No. 12 D, the coaxality of fan shaft and motor shaft and the parallelism of both ends of coupling are measured by dial gage and feeler gage. The permissive coaxial error is 0.05 mm. The permissive parallelism error of coupling is 0.1mm.
7. Turn the rotor with hand or lever after installation to check whether it is over tight or touched with stationary components.
8. After installing the motor, install the belt pulley or coupling guard, if the inlet is not connected to the inlet pipe, the protective net or other safety device is also added (provided by user himself). Other parts of the fan are fixed according to the drawing.
Because of the flow rate Q, total pressure H, the shaft speed n, and shaft power N having the specific relations:
Thus, without changing the motor capacity, the shaft speed can not change, otherwise, the motor may be damaged by overload.
The motor power used by fan indicates under the specific operating condition, shaft power plus mechanical loss and storing quantity, but not the required power when the outlet full open, if the outlet or inlet of fan without connecting pipe or without outside resistance, the motor can not be put into operation. For the safety, a valve should be installed in the inlet and outlet pipes of the fan, close the valve when motor start up, the valve is slowly open after running, until reached the specific operating condition, and pay attention to the current if exceeds the rated value.
Maintenance
1. Don’t allow fan with trouble running.
2. Maintenance of fan can only be carried out during shut-down of fan.
3. Don’t freely change the maintenance person, specific person operating and repair the fan is preferred.
4. When the fan is repaired, the motor switch must be monitored or locked.
5. Regularly remove dust, contamination and the foreign materials and prevent rust.
6. Inspect the thermometer and oil indicator regularly.
7. Except replacing the lubricant after overall, replace the lubricating oil periodically.
List of troubles and causes
Troubles causes
Severe vibration of bearing box 1.The shaft of fan is not parallel with that of motor; the coupling is misalignment.
2.friction between casing or inlet and impeller.
3.The foundation is not rigid enough or firm enough.
4.loosing of rivets in impeller or deformation of impeller.
5.Loose matching of shaft with impeller main disc.
6.Loosing of the bolts which connect casing and bearing with support, bearing with its cover.
7.Installation of fan inlet and outlet ducts is improper, which causes vibration.
8.The rotor is unbalance.
High temperature-rise of bearing 1.Severe vibration of bearing box.
2.Lubricant is poor in quality, deteriorated, mixed with dust, sand, contamination and etc.
3.Connection of bearing box cover and pedestal is over tight or Loose.
4.Fixing position between shaft and rolling bearing is slant, the front and back bearing are out of alignment.
5.wornout of rolling bearing.
Over current and high temperature-rise in motor 1.Gate or damper in the inlet and outlet pipes are not closed when starting-up.
2.Flow rate exceeds the specific value or air duct leaks.
3.Air density delivered by fan is over strong or contain visco-materials.
4.Input voltage of motor is low or is cut out in a single phase.
5.Coupling connecting is out of alignment the belt is too tight or the clearance is not uniform.
6.Influence caused by severe vibration of bearing box.
7.Influence caused by fan in parallel operation condition is worse or trouble happened.
Belt sliding Two belts are not in the center line. The belt slides down from a small belt pulley.
Bet chattering The distance of two belt pulleys is too short or the belt is too long.
