欢迎光临瑞柘环保!瑞柘竭诚为您提供罗茨风机、水冷风机、环形风机、喷泉曝气机、罗茨真空泵等设备的生产、安装、维修、保养服务!
罗茨鼓风机原理与用途

— 新闻中心 —

联系我们/ CONTACT US
服务热线 400-155-8689
上海瑞柘环保设备集团有限公司

邮箱:sunnycommand@foxmail.com

手机:400-155-8689

电话:400-155-8689

地址:江苏省苏州市昆山市紫竹路699号保利大厦

您的位置:首页 >> 新闻中心 >> 常见问题

常见问题

厂家分享根治罗茨鼓风机经常烧电机的方法

Manufacturers share a radical cure for the frequent motor burns of Roots blowers

发布时间:2022-07-25 13:13:37 人气:92 点赞:0

  罗茨鼓风机一般采用电机为动力源(也有部分以柴油机为动力源),电机是罗茨风机必不可少的配套设备,电机正常工作,罗茨鼓风机才能正常工作,电机作为罗茨风机的动力源,如果电机烧坏(烧毁)就意味着风机失去了动力,会停止工作,电机烧坏的原因有很多,常见罗茨风机烧电机的原因有以下几点。

  一、电机缺相运行

  这是个三相异步电机的杀手,电机正常运行时三相负载为对称负载,因此 三相电流基本保持平衡,大小相等,如果运行中电机缺相(三相绕组中任一相断开的现象叫缺相),风机振动将会变大、出现异常声音、转速下降、电流增加,电机温度将会急剧升高, 从而导致电机烧坏,质量一般的电机*多十几分钟就会烧坏。*可怕的是整个供电系统的缺 相,再加上很多设备的开关是自锁的或自动开启的(如风机、水泵),一次停电后的再送电缺相事故,可能一下烧十几个电机。

  电机受到外在侵害导致烧毁坏比如,电机缺相运行、风机振动造成接线柱松脱相间短路;配电柜或电机进水或受潮造成绝缘降低;设备电线老化;灰尘介入太多;工作电压不对,电压持续过高或者过低,这些情况都会影响罗茨风机电机的正常工作,罗茨风机工作时,电机温度急剧升高,导致电机烧毁,质量一般的电机可能在十几分钟内被烧毁,更可怕的是供电系统缺相,很多风机的开关是自锁的或自动开启的,一次停电后的再送电缺相事故,可能一下会烧坏多台电机。所以,罗茨风机在使用前,注意检查各项指标正常后再启动,可以减少故障。

根治罗茨鼓风机经常烧电机的方法

  二、轴承损坏。

  由于长时间不间断的让罗茨风机运行致使由于电机本体运行温升过高,且轴承补充加油脂不及时造成轴承缺油直至轴承损坏、会出现轴弯曲、皮带断裂等现象,致使定、 转子摩擦(俗称扫膛)引起铁心温度急剧上升,烧毁槽绝缘、匝间绝缘,从面造成绕组匝间 短路或对地“放炮”。严重时会使定子铁心倒槽、错位、转轴磨损、端盖报废等。轴承损坏一般还有下列原因造成:

  1、轴承装配不当,如冷装时不均匀敲击轴承内圈使轴受到磨损,导致 轴承内圈与外圈配合失去过盈量或过盈量变小,出现跑内圈现象,装电机端盖时不均匀敲击, 导致端盖轴承室与轴外圈配合过松出现跑外圈现象。无论跑内圈还是跑跑外圈均会引起轴承 运行温升急剧上升,只要轴承完好,允许间断性跑外圈现象存在。

  2、轴承承墙内未清洗干净,或加油脂不干净。例如轴承保持微小钢性物质为彻底清理干净,运行是轴承滚到受损引起温 升过高烧毁轴承。

  3、轴承重新更换加工,电机端盖嵌套后过盈量大或椭圆度超标引起轴承滚珠游隙过小或不均匀导致轴承运行时摩擦力增加,温度急剧上升直至烧毁。

  4、由于定、转子铁心轴向错位或重新对转轴机加工后精度不够,致使轴承内、外圈不在一个切面上而引起轴承运行“吃别劲”后温升高直至烧毁。

  5、由于不同型号的油脂混用造成轴承损坏。

  6、轴承本 身存在质量问题,例如滚道锈斑、转动不灵活、游隙过小、保持架变形等。

  7、备用机长期不运行,油脂变质,轴承生锈而唯有对其保养和维护只能使用中注意定期检查和定期更换相同品牌油脂。

  三、风阀关闭或堵塞的情况下启动会造成过载烧毁

  由于罗茨风机启动后风阀未有打开或打开的量不够。而罗茨风机在此情况运行下,致使由于电机本体运行温度急剧上升直至烧毁。风口或风阀复位后,而罗茨风机未及时关闭,而罗茨风机在此情况运行下,也会致使由于电机本体运行温度急剧上升直至烧毁。

  罗茨鼓风机启动时受阻较大,则电机电流值超过规定电流值,造成电机过热,持续时间较长会造成绕组烧毁。所以,罗茨风机启动时要空载启动,先打开所有主路、旁路阀门,使罗茨风机空压启动,待风机空载正常运转数分钟后,再关闭阀门,一般情况下,为了保护电机还会配备降压启动柜。还有,当主路或者旁路风口或阀门关闭后,而罗茨风机未及时关闭,而风机在此情况下运行,也会导致电机运行温度急剧上升、烧毁。除了罗茨风机启动或关闭时阻力较大,还有其他诸如管道系统实际压力超过铭牌压力值,比如,风机管路有异物进入没有及时排除,也可能会造成烧坏电机,所以,需要经常观察压力表是否正常,经常观察并清理管路异物,保持畅通。

  罗茨鼓风机铭牌上标注了风机升压值,表示罗茨鼓风机在此电机功率下所能承受的阻力。罗茨风机吸入气流,经过转子的强制推动后气流升压,输出系统。当系统阻力远超设备的升压值时,会出现动力不够,当阻力大于升压值时,电机输出的功欠缺,刚开始会表现为电机发热,继续使用线圈将被烧断,电机被烧毁。如果属于风机选型错误,则需要重新选型,所以,选择适当的机型,匹配合适功率的电机非常重要。当风机管路堵塞时,也会出现阻力超过规定升压值,需要全面清理风机管路,比如,止回阀装反,会瞬间增大罗茨风机的阻力,导致电机烧坏,这都是较常见的电机烧毁原因。

  四、受潮与高温

  因为配电柜或电机进水或受潮造成的绝缘降低,也是常见的损坏原因,但是没有办法作防护。只能使用中注意和定期摇绝缘。在电机没爆以前,烘干、重新浸漆可解决。尤其是用变频器驱动的电机,更要小心此项,不然可能连变频器一块报销。

  罗茨风机运行温度过高,比如,风机房温度过高这个原因常被忽视,一般情况下,环境温度较低时,罗茨风机可使用顺利,可到了夏天高温季节,风机房内温度过高,加上风机运转产生的热量不能及时有效散热,空气经过罗茨风机的不断吸入、升压,使得机房内温度不断升高,当罗茨风机温度过高,会导致各种情况的发生,比如,齿轮箱润滑油失效,齿轮摩擦力增大,带连传动皮带出现问题,直连传动联轴器出现故障等,这些都可能引发罗茨风机并发问题,造成电机烧毁。所以,风机房需要有效隔音的同时,也要确保风机房的通风换气,有效散热,达到降温的目的,较少故障。

  五、其它

  另外还有的不是很常见的原因:如电压过低或过高,超载、震动造成接线柱松脱相间短路,虫鼠危害、进口电机电压与国内电压不配合(如日本电机)、电机质量。罗茨风机电机的本身如果存在质量问题,也会造成电机故障,而电机的一般损坏形式是烧毁。电机的品质有好有坏,质量好的电机耐用,寿命会长久,质量低的则使用寿命则短,容易出故障。所以,选择罗茨风机不能一味追求低价,货比三家,慎重选择。各种减压起动回路故障造成不转换,电机长时间低压工作等等。在使用前注意预先检查各项指标后在启动,可以减小事故率。

  罗茨鼓风机超载也会造成电机烧毁。罗茨风机与电机的联接方式有两种,一种为联轴器直联,因罗茨鼓风机的流量和压力性能点较密集,电机转速不同,则输出流量和压力不同,因此调节转速可改变流量,所以,罗茨风机还有一种常见的连接方式——皮带联接。当罗茨风机因各种原因出现卡顿时,电机提供的动力无法正常带动风机,则风机轴功率超过电机功率,超过的越多,则电机烧毁的可能性越大,在罗茨风机正常运转时,电机动力绰绰有余,但风机卡顿时,阻力远大于电机做功,则造成电机烧毁,这种情况一般属于机械故障,通常与机头关系密切,比如,罗茨风机叶轮存在问题,出现叶轮抱死,导致电机烧坏。

  就使用情况来看:

  1、缺相运行,电机噪音大,发热,时间稍长会发热烧毁。

  2、电机本为星接380v,角接220v, 但实际使用时未注意此差别,现场实际为角接380v,导致电机烧毁。

  3、电机轴承长时间未做维护:补油脂或换新轴承,运行时发热、电机扫镗烧毁。

  4、变频控制,长时间低频运行,未配强冷风导致电机散热不足烧毁。

  5、若是制动电机,制动器故障打不开或未或未完全打开, 导致电机烧毁。

  6、负载堵转或电机长时间过流烧毁。

  7、电源电压过高。电源电压过高引 起电机绕组线圈过流而烧毁。

  8、电机绝缘质量欠佳。如匝间和相间短路或与外壳击穿。

  9、过载。如缺相,电源电压过低,机械故障,功率配备余量过小都是过载的表现。引起电机烧毁*多的是电源缺相和机械故障

  总之,造成罗茨风机电机烧毁的常见原因一般就以上几点。若您使用的罗茨风机老是烧电机,请从上文介绍的原因中排查!同时,罗茨风机电机和机头在使用时,同样需要进行维护,平时注意清洁、风机管路畅通、压力值正常、尽量不受到外界恶劣环境因素的破坏,在使用时按照罗茨风机厂家使用说明书进行操作,尽可能避免问题出现。平时注意做好以上说明的几点,即可避免大多数的罗茨鼓风机电机烧毁。

  瑞柘环保生产销售各种三叶、两叶、密集、沉水、水冷等型号的罗茨鼓风机!需要购买罗茨风机,请咨询我们报价哦!若您遇到了罗茨鼓风机老烧电机的情况,可根据上面的原因排查解决,如果仍然不能解决问题的。请联系我们,我们会安排相应的维修师傅与您沟通,共同解决罗茨鼓风机烧电机的问题哦!

  Roots blower generally uses motor as power source (also partially diesel engine as power source). Motor is an indispensable auxiliary equipment for Roots blower. Only when motor works properly can Roots blower work properly. Motor is the power source for Roots blower. If motor burns out, it means that blower loses power and will stop working. There are many reasons for motor burnout. The common reasons for burning motor of Roots blower are as follows.

  I. Motor Phase-missing Operation

  This is the killer of a three-phase asynchronous motor. The three-phase load is symmetrical when the motor is in normal operation, so the three-phase current is basically balanced and the size is equal. If the motor is out of phase during operation (the phenomenon that any phase in the three-phase winding is disconnected is called out of phase), the vibration of the fan will increase, abnormal sound will occur, speed will decrease, current will increase, and the temperature of the motor will rise sharply, which will cause the motor to burn out. A motor of average quality can burn out in up to ten minutes. The most terrible thing is that the whole power supply system is out of phase, in addition to many equipment switches that are self-locking or self-opening (e.g. fans, pumps), power supply after a power failure is out of phase, which may burn more than a dozen motors at once.

  External damage to the motor results in burnout, such as short circuit between terminals loosened due to motor phase missing operation and fan vibration; The insulation of distribution cabinet or motor is reduced due to water inflow or moisture; Aging of equipment wires; Too much dust is involved; Incorrect working voltage, continuous high or low voltage will affect the normal operation of the Roots blower motor. When the Roots blower is working, the temperature of the motor rises sharply, resulting in the burnout of the motor. The motor of average quality may be burned out in ten minutes. What is worse is that the power supply system is out of phase. Many of the blower switches are self-locking or self-opening. Power supply is out of phase after a power failure. Several motors may burn out in one go. Therefore, before using the Roots blower, pay attention to check each index before starting, so as to reduce the fault.

  2. Bearing damage.

  Due to the continuous operation of Roots blower for a long time, the temperature of the motor body rises too high, and the lack of oil in the bearings until the bearings are damaged, shaft bending and belt breakage occur due to the lack of oil in the bearings replenishment and greasing in time. As a result, friction between the stator and rotor (commonly known as bore sweeping) causes the temperature of the iron core to rise sharply, burns down the groove insulation and turn-to-turn insulation, and causes short circuit between windings or fires on the ground. In serious cases, stator core will be chamfered, misaligned, shaft wear, end cover scrap, etc. Bearing damage is generally caused by the following reasons:

  1. Improper assembly of bearings, such as uneven tapping on the inner race of bearings during cold installation makes the shaft worn, resulting in loss of interference or reduction of interference between inner race and outer race of bearings, resulting in running-in inner race phenomenon, and uneven tapping when installing end cap of motor, resulting in loose mating between bearing chamber of end cap and outer race of shaft. Whether the inner race or the outer race will cause the temperature rise of the bearing to rise sharply. As long as the bearing is in good condition, intermittent running of the outer race is allowed.

  2. Bearing wall is not cleaned or greased. For example, to keep the bearings clean, the operation is to burn the bearings because the temperature rise is too high when the bearings roll to damage.

  3. Bearing replacement and machining, large interference after motor end cap nesting or excessive ellipticity causes too small or uneven clearance of bearing ball, which leads to increased friction during bearing operation, and the temperature rises sharply until it burns out.

  4. Due to axial misalignment of stator and rotor cores or inadequate precision after re-machining of rotating shafts, the inner and outer rings of bearings are not on a tangential surface, which causes the temperature of bearings to rise until they are burnt out.

  5. Damage to bearings due to mixing of different types of grease.

  6. Quality problems exist in the bearing itself, such as rust spots on the raceway, inflexible rotation, too small clearance, deformation of the holder, etc.

  7. Standby machine does not run for a long time, grease deteriorates and bearings are rusty. Only pay attention to regular inspection and regular replacement of the same brand grease during its maintenance and maintenance.

  3. Starting with the air valve closed or blocked will cause overload burnout

  The air valve was not opened or was not opened enough after starting the Roots blower. The Roots blower operates under this condition, causing the temperature of the motor body to rise sharply until it burns out. When the air outlet or air valve is reset and the Roots blower is not switched off in time, the operation of the Roots blower will cause the temperature of the motor body to rise sharply until it burns out.

  If the Roots blower is blocked greatly when starting, the current value of the motor exceeds the specified current value, which will cause the motor to overheat and burn out the winding for a long time. Therefore, when starting the Roots blower, it is necessary to start without load. Open all main and bypass valves first to start the Roots blower under air pressure. Close the valves several minutes after the normal operation of the roots blower under no load. Generally, in order to protect the motor, a step-down starting cabinet is also provided. In addition, when the main or bypass air vents or valves are closed and the Roots blower is not closed in time, the operation of the blower in this case will also cause the temperature of the motor to rise sharply and burn out. In addition to the high resistance when the Roots blower starts or closes, there are other factors such as the actual pressure of the piping system exceeds the nameplate pressure value. For example, foreign bodies in the blower piping may not be removed in time, or the motor may be burned out. Therefore, it is necessary to constantly observe whether the pressure gauge is normal, and constantly observe and clean up foreign bodies in the piping to keep it unblocked.

  The boost value of the roots blower is indicated on the roots blower nameplate as the resistance that the roots blower can withstand at this motor power. Roots blower sucks in airflow and then pressurizes the rear airflow through the forced drive of the rotor to output the system. When the resistance of the system far exceeds the boost value of the equipment, there will be insufficient power. When the resistance is greater than the boost value, the power output of the motor is deficient. At first, it will be shown as the heat of the motor. If the coil continues to be used, the motor will be burnt out. If the fan is selected incorrectly, it needs to be re-selected. Therefore, it is very important to select the right type and match the right power motor. When blocked, the resistance will also exceed the specified boost value, so it is necessary to clean the blower line thoroughly. For example, if the check valve is reversed, the resistance of Roots blower will increase instantaneously, which will cause motor burnout. All of these are common reasons for motor burnout.

  IV. Moisture and high temperature

  Reduced insulation due to water ingress or moisture in the distribution cabinet or motor is also a common cause of damage, but there is no way to protect it. Only pay attention to and periodically shake insulation during use. Drying and re-dipping can be done before the motor explodes. Especially for motors driven by converters, be more careful about this, or you may reimburse the converters together.

  The operating temperature of Roots blower is too high. For example, the reason why the temperature in the fan room is too high is often overlooked. Generally, when the ambient temperature is low, the Roots blower can be used smoothly. During the hot summer season, the temperature in the fan room is too high, and the heat generated by the operation of the blower can not be dissipated effectively in time. The air is continuously sucked in and boosted by the Roots blower, which causes the temperature in the machine room to increase continuously. When the temperature of the Roots blower is too high, This may lead to various situations, such as the failure of lubricant in gear box, the increase of gear friction, the problem of belt with drive, the failure of direct drive coupling and so on. All of these may lead to the concurrent problems of Roots blower and the burnout of motor. Therefore, the fan room needs effective sound insulation, at the same time, it also needs to ensure ventilation and ventilation, effective heat dissipation, to achieve the purpose of cooling, less faults.

  V. OTHER

  In addition, there are also uncommon reasons: for example, low or high voltage, overload and vibration cause terminal loosening and short circuit between phases, insect and mouse hazards, incompatibility of import motor voltage with domestic voltage (e.g. Japanese motor), motor quality. The Roots blower motor itself can also cause motor failure if there is a quality problem, and the general form of motor damage is burnout. Motor quality is good or bad, good quality motor is durable, long life, low quality motor has short service life and is prone to failure. Therefore, the selection of Roots blower can not blindly pursue low prices, comparing goods and choose carefully. Faults in various reduced pressure starting circuits cause non-switching, long time low voltage operation of motors, etc. The accident rate can be reduced by checking each index beforehand and starting after use.

  Overload of Roots blowers can also cause motor burnout. There are two ways to connect a Roots blower to a motor. One is a coupling. Because the flow and pressure performance points of the Roots blower are dense and the speed of the motor is different, the output flow and pressure are different. Therefore, adjusting the speed can change the flow rate. Therefore, there is another common way to connect a Roots blower - belt connection. When a Roots blower is stuck due to various reasons, the power provided by the motor can not properly drive the blower, then the shaft power of the blower exceeds the power of the motor. The more power exceeds, the greater the possibility of burning the motor. When the Roots blower is in normal operation, the power of the motor is more than enough. However, when the blower is stuck, the resistance is much greater than the work done by the motor, causing the burning of the motor. This situation is generally a mechanical failure and is usually closely related to the head, for example. There is a problem with the impeller of Roots blower. The impeller is locked and the motor burns out.

  In terms of usage:

  1. When the motor operates in phase-absence mode, it will be noisy and hot, and burn out after a long time.

  2. The motor was originally 380V star-connected and 220V angle-connected, but this difference was not noticed in actual use. In fact, the field is 380V angle-connected, which led to the burnout of the motor.

  3. Motor bearings have not been maintained for a long time: repairing grease or replacing bearings, heating during operation, motor sweeping, boring and burning out.

  4. Frequency conversion control, long-term low-frequency operation, without strong cooling air, resulting in insufficient heat dissipation of the motor burned out.

  5. If the brake motor is braked, the brake fails to open or is not opened completely, resulting in the burnout of the motor.

  6. The load is blocked or the motor is burnt out by overcurrent for a long time.

  7. The supply voltage is too high. High supply voltage causes overcurrent of motor winding coils and burns them out.

  8. Insulation quality of motor is poor. Such as short circuit between turns and between or breakdown with the housing.

  9. Overload. If phase is missing, power supply voltage is too low, mechanical failure, and power allowance is too small, these are the manifestations of overload. The most common causes of motor burnout are power supply phase absence and mechanical failure.

  In a word, the common causes of burnout of Roots blower motor are generally the above points. If the Roots blower you are using is always burning the motor, please check it out from the reasons described above! At the same time, when using the Roots blower motor and head, maintenance is also required. Pay attention to cleanliness, smooth blower lines, normal pressure values, and try not to be damaged by external harsh environmental factors. Operate according to the instructions of Roots blower manufacturer in order to avoid problems as far as possible. Pay attention to the points mentioned above in ordinary times to avoid most Roots blower motors from burning out.

  Rye Environmental Production and Sales of various three-leaf, two-leaf, dense, submerged, water-cooled Roots blower models! Need to buy Roots blower, please consult us for quotation!


风机推荐

在线客服
服务热线

服务热线

400-155-8689

微信咨询
厂家分享根治罗茨鼓风机经常烧电机的方法-[瑞柘环保]
小程序
罗茨风机厂
返回顶部
X厂家分享根治罗茨鼓风机经常烧电机的方法-[瑞柘环保]

截屏,微信识别二维码

微信号:{label:wx}

(点击微信号复制,添加好友)

  打开微信

微信号已复制,请打开微信添加咨询详情!