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  • 更换机械密封的详细步骤与技巧方法
  • 本站编辑:杭州久密机械科技有限公司发布日期:2020-09-28 09:52 浏览次数:

更换各种水泵机械密封的细节以及更换机械密封的方法

Details of replacement of mechanical seals for various pumps and methods for replacement of mechanical seals

为了保证水泵的正常运转,一般三个月更换一次机封,本文就如何更换机封以及更换机封的步骤做详细说明,供大家参考。

In order to ensure the normal operation of the pump, the mechanical seal is generally replaced once every three months. This paper describes in detail how to replace the mechanical seal and the steps of replacing the mechanical seal for your reference.

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工具和原料

Tools and materials

活动扳手、套筒扳手、 一字螺丝刀、一字螺丝刀、沙纸、干净棉布、润滑脂

Adjustable wrench, socket wrench, slotted screw driver, slotted screwdriver, sandpaper, clean cotton cloth, grease

维修工作台、全新机封一套。

Maintenance table, a new set of mechanical seal.

换水泵机械密封的方法:1.先装左边部分;装到密封板上2.然后装右面那个动环,动环跟静环的密封面要干净3.再装平键和叶轮.上好垫片和螺母。安装前要认真检查集结密封零件数量是否足够,各元件是否有损坏,特别是动、静环有无碰伤、裂纹和变形等缺陷。如果有问题,需进行修复或更换新备件。

The method of changing the mechanical seal of water pump: 1. Install the left part first; install it on the sealing plate; 2. Then install the moving ring on the right side, and the sealing surface of the moving ring and the static ring should be clean; 3. Install the flat key and impeller, and install the gasket and nut. Before installation, it is necessary to carefully check whether the number of assembly sealing parts is enough, whether the components are damaged, especially whether the dynamic and static rings are damaged, cracked and deformed. If there is any problem, repair or replace with new spare parts.

检查轴套或压盖的倒角是否恰当,如不符合要求则必须进行修整。

Check whether the chamfering of shaft sleeve or gland is proper, if not, it must be trimmed.

机械密封各元件及其有关的装配接触面,在安装前必须用丙酮或无水酒精清洗干净。安装过程中应保持清洁,特别是动、静环及辅助密封元件应无杂质、灰尘。动、静环表面涂上一层清洁的机油或透平油。

All components of mechanical seal and its related assembly contact surface must be cleaned with acetone or anhydrous alcohol before installation. During installation, it should be kept clean, especially the dynamic and static rings and auxiliary sealing elements should be free of impurities and dust. Apply a layer of clean engine oil or turbine oil on the surfaces of moving and stationary rings.

上紧压盖应在联轴器找正后进行。螺栓应均匀上紧,防止压盖断面偏斜,用塞尺或专用工具检查各点,其误差不大于0.05毫米。

Tighten the gland after the coupling alignment. The bolts should be tightened evenly to prevent the gland section from skewing. Check each point with a feeler gauge or special tool, and the error is not more than 0.05mm.

检查压盖与轴或轴套外径的配合间隙(及同心度),必须保证四周均匀,用塞尺检查各点允差不大于0.10毫米。

Check the fit clearance (and concentricity) between the gland and the shaft or shaft sleeve outer diameter, and ensure that it is even all around. Use a feeler gauge to check that the tolerance of each point is not greater than 0.10 mm.

弹簧压缩量要按规定进行,不允许有过大或过小的现象,要求误差±2.00毫米,过大会增加断面比压,加速断面磨损。过小会造成比压不足而不能起到密封作用,弹簧装上后在弹簧座内要移动灵活。用单弹簧时要注意弹簧的旋向,弹簧的旋向应与轴的转动方向相反。

The amount of spring compression should be carried out according to the regulations. It is not allowed to have too large or too small phenomenon. The error is required to be ± 2.00 mm. If it is too large, the specific pressure of the section will be increased and the wear of the section will be accelerated. If it is too small, the specific pressure will not be enough to play a sealing role. After the spring is installed, it should move flexibly in the spring seat. When using a single spring, pay attention to the rotation direction of the spring. The rotation direction of the spring should be opposite to the rotation direction of the shaft.

动环安装后须保持灵活移动,将动环压向弹簧后应能自动弹回来。

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After installation, the moving ring must be able to move flexibly, and it can automatically spring back after pressing the moving ring to the spring.

先将静环密封圈套在静环背部后,再装入密封端盖内。注意保护静环断面,保证静环断面与端盖中心线的垂直度,且将静环背部的防转槽对准防转销,但勿使其中互相接触。

First, the static ring seal ring is set on the back of the stationary ring, and then installed into the seal end cover. Pay attention to protect the section of the static ring, ensure the perpendicularity of the section and the center line of the end cover, and align the anti rotation groove on the back of the static ring with the anti rotation pin, but do not make them contact each other.

安装过程中决不允许用工具直接敲打密封元件,需要敲打时,必须使用专用工具进行敲打,以防密封元件的损坏

During the installation process, it is not allowed to directly knock the sealing elements with tools. When it is necessary to knock, special tools must be used to knock to prevent damage to the sealing elements

组装时所有密封圈应该涂以肥皂水等润滑剂,这样可以避免组装过程中损坏胶圈。动静环的密封面之间涂以润滑脂,防止动静环密封面在水泵开车前磨损。

During assembly, all sealing rings should be coated with soap water and other lubricants to avoid damage to rubber rings during assembly. The sealing surfaces of the dynamic and static rings are coated with grease to prevent wear of the sealing surfaces of the dynamic and static rings before the pump is started.

浮动环组装时,一定要小心不要碰倒浮动环弹簧,以免弹簧碰倒后影响浮动环的浮动性能。浮动环组装后,可以轻轻按浮动环,以确定是否就有良好的浮动性能。

When assembling the floating ring, be careful not to knock down the floating ring spring, so as not to affect the floating performance of the floating ring after the spring is knocked down. After the floating ring is assembled, you can press the floating ring gently to determine whether it has good floating performance.

安装密封时应轻拿轻放,防止损坏密封件,安装时应将密封及腔体擦洗干净。

When installing the seal, it should be handled with care to prevent damage to the seal. The seal and cavity should be cleaned during installation.

紧固机械密封压盖时紧固螺栓应均匀受力,防止受力不均损坏机械密封。对于快装式机械密封在整体组装完毕后一定不要忘记将定位片径向移动道远离轴的位置固定。

When fastening the mechanical seal gland, the fastening bolt should be evenly stressed to prevent the mechanical seal from being damaged by uneven force. For the quick installation mechanical seal, do not forget to fix the position far away from the shaft of the radial moving path of the locating piece after the whole assembly.

因为机械密封所密封的介质是不同的,凉水和热水的温度不同,密封的介质是否具有腐蚀性,腔室内压力的不同,机械密封的设计就会不同,检修工艺也会有所差别,

Because the sealing medium of mechanical seal is different, the temperature of cold water and hot water is different, whether the sealing medium is corrosive, and the pressure in the chamber is different, the design of mechanical seal will be different, and the maintenance process will also be different,

机械密封检修过程中总结出一些经验:机械密封要组装,清扫检查莫忘记。先看两环后看轴,伤痕裂纹不要漏。最后在把胶圈看,气孔直径要看清。各种尺寸需测量,两环间隙要调好。紧力一定要校核,小小弹簧是关键。螺栓受力要均匀,轻拿轻放好习惯。

Mechanical seal maintenance process summed up some experience: mechanical seal assembly, cleaning and inspection do not forget. First look at the two rings and then look at the shaft. Do not leak the scar and crack. Finally, when looking at the apron, the pore diameter should be clear. Various dimensions need to be measured and the clearance between the two rings should be adjusted. The tightening force must be checked, and the small spring is the key. The stress of bolt should be uniform, and it should be handled with care.

水泵机械密封是转动机械本体密封最有效的方式之一,其本身加工的精度比较高,尤其是动、静环,如果拆装方法不合适或使用不当,装配后的机械密封不但达不到密封的目的,而且会损坏集结的密封元件。

The mechanical seal of water pump is one of the most effective ways to seal the body of rotating machinery. Its machining accuracy is relatively high, especially for the dynamic and static rings. If the disassembly method is not suitable or used improperly, the assembled mechanical seal will not only fail to achieve the purpose of sealing, but also damage the assembled sealing elements.

机械密封拆卸时注意事项

Precautions for mechanical seal disassembly

在拆卸机械密封时,严禁动用手锤和扁铲,以免损害密封元件。

When disassembling the mechanical seal, do not use the hand hammer and flat shovel to avoid damaging the sealing elements.

如果在泵两端都有机械密封时,则在拆卸过程中必须小心谨慎,防止顾此失彼。

If there are mechanical seals at both ends of the pump, care must be taken in the disassembly process to prevent one from losing the other.

对工作过的机械密封,如果压盖松动时密封面发生移动的情况,则应更换动静环零件,不应重新上紧继续使用。因为在松动后,摩擦副原来运转轨迹会发生改变,接触面的密封性就很容易遭到破坏。

For the mechanical seal that has been working, if the sealing surface moves when the gland is loose, the dynamic and static ring parts should be replaced instead of being tightened again. Because after loosening, the original running track of friction pair will change, and the sealing of contact surface is easy to be damaged.

如密封元件被污垢或凝聚物粘结,应清除凝结物后再进行机械密封的拆卸。

If the sealing element is bonded by dirt or agglomerate, the mechanical seal shall be disassembled after removing the condensate.

采用机械密封的水泵有:化工泵,离心泵,多级泵, 自吸泵及各种排污泵产品

Mechanical seal pumps are: chemical pumps, centrifugal pumps, multi-stage pumps, self-priming pumps and a variety of sewage pump products