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<TD height=22 colspan="2"> <a >http://www.chinaseal.cn/
</a>(2004-9-13 12:24:46)<font color="#990000"><a href="http://www.pussyx888.com/" target="_blank"><font color="#990000"> 中d密封技?/font></a> </font></TD>
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【关键词】܇阀,密封试验
<p>【论文摘要】水늻合Y填料的密试?/p>
<p> <a href="http://www.pussyx888.com" target="_blank">填料密封</a>h填料来源qѝ加工容易、hg廉、密可靠、操作简单等特点Q因此适用范围较广。近几年来随着密封填料的发展，填料密封在材料、结构Ş式以及各U特性方面得C较大的改善，所以在机械行业填料密封得到了更为广泛的应用Q取得了良好的经效益?/p>
<p> 1 填料密封的工作机?/p>
<p> 在机械行业填料密主要用作动密封。常用作dc压~机、真I܇、搅拌机的{轴密，在填料密的设计选择上，应以机械讑֤的工作条件ؓ主要考虑因素Q填料的选择应考虑具备如下条gQ?/p>
<p>Q?Q?有一定的塑性，在压紧力作用下能产生一定的径向力ƈ与紧密u接触?/p>
<p>Q?Q?有够的化学E_性，不污染介质，填料不被介质泡胀Q填料中的浸渍剂不被介质溶解Q填料本w不腐蚀密封面?/p>
<p>Q?Q?填料自润滑性能良好Q耐磨Q摩擦系数小?/p>
<p>Q?Q?轴存在少量偏ULQ填料应有够的动Ҏ?/p>
<p>Q?Q?刉简单、填装方?/p>
<p> 为此Q需要经常对<a href="http://www.pussyx888.com" target="_blank">填料</a>的压紧程度进行调节，使填料中的润滑剂在运行一D|间而有所失之后Q再挤出一些润滑剂Q同时补偿填料因体积变化所造成的压紧力村ּ。当然这L常挤压填料，最后将使浸渍剂枯竭Q所以定期更换填料是必要的。此外，Zl持液膜和带走摩擦热Q有意让填料处有量泄漏也是必要的?/p>
<p> 2 盘根填料在水泵用中存在的问?/p>
<p> 水܇的u一般采用a石盘ҎҎ纱盘根。a石盘根具有耐热性、柔软性好、强度高{优点，但它也有致命的缺点：~结后表面粗p、摩擦系数大、有渗漏现象Q另外用久了浸入的润滑剂容易流失。浸ҎUq根在水中长期会变得很，而且׃膨胀pL大，摩擦力较大。在实际生中，l常出现q样的状况：C好的讑֤Q开始运行时轴封状况良好Q但用不了多久，泄漏量便不断增加Q调整压盖和更换填料的工作也逐渐频繁Q运转不C个周期，轴套已损成花瓶状Q严重时q会出现轴套断Qƈ且水环后面更换不到的盘根均已腐烂，无法起到密封作用?/p>
<p>ȝ来开Q盘根填料具有如下缺点（1Q盘根填料与轴直接接触，且相对{动，造成轴与轴套的磨损，所以必d期或不定期更换u套。（2Qؓ了盘根与u或u套间产生的摩擦热及时散掉Q盘根密必M持一定量的泄漏，而且不易控制。（3Q盘根与轴或轴套间的摩擦Q造成甉|有效功率降低Q消耗电能，有时甚至辑ֈ5Q－10Q的惊h比例。ȝ来看Q盘根填料具有如下缺点：从填料密的原理来看Q流体在密封腔内可泄漏的通道有三处：其一是流体穿透纤l材料造成泄漏Q其二是从填料与填料׃之间泄漏Q其三是从填料与轴表面之间泄漏。因此防止水泉|漏最为关键的措施是：Q?Q合理选择密封填料Q（2Q设计合理的密封腔体Q调整适当的密压紧力?/p>
<p> 3 l合<a href="http://www.pussyx888.com" target="_blank">软填料密?/a>的设?/p>
<p> 设计的填料腔l构如图2所C。填料腔体内填充一U优良的密封软材料，它是qU维、高U度矛_、聚四氟乙烯、有机密剂{组成。它耐热Q?8℃－200℃，最大压?.7MpaQ最大线速度8m/sQ耐腐蚀性强Q适用介质PHD?Q?3Q主要适用于水介质。这UY填料状态ؓ胶惔Ӟ摩擦pL低、合体之间分子吸引力小。在轴的q{q程中，填料中的U维会缠l在轴上Qƈ随u一赯{动，形成一个“旋转层”，此“旋转层”vC保护轴或轴套的作用，避免了u套磨损，减小了动力消耗；随着“旋转层”直径的逐渐增大Qu对纤l的~绕能力逐步减弱Q没有与轴缠l，q且与填料腔内壁保持相对静止Q在填料腔内形成一个“剪切层”，此时相对旋{q动的摩擦剪切区域就存在于填料中间而不是存在于填料与u之间。另外在注入的填料两端压入聚四氟乙烯~结填料Q利用此~结填料端环合Y填料压紧。ؓ了轴在高速{动过E中Q合Y填料不被挤压摔出Q特意在填料腔体和压盖处设计加工了螺旋槽Q值得注意的是填料两端的螺旋槽方向应互为相反，q样保证轴旋转时能生混合填料受到向内的܇送作用，有效防止了填料的飞溅?/p>
<p>4 水܇试验情况</p>
<p> l合填料设计制作完成后，在水泵试验台上进行试验。试验台设计工况如下Q电{?500r/minQ工作压?MPaQ介质ؓ清水Q介质温度常温?/p>
<p> 填料装填q程按如下操作步骤进行（1Q清理填料腔Q检查u表面是否有划伤、毛刺等现象Q保证u的粗p度辑ֈ囄要求Ra1.6Q（2Q用癑ֈ表检查u在密部位的径向跛_Q其公差应在0.03mm-0.08mm范围内。（3Q装填时对编l聚四氟乙烯端环最好先取一根与轴同寸的木，编l聚四氟乙烯~绕在木上Q再用刀切断Q切口最好成45º斜面Q用一与填料腔同尺寸的木质两半轴套Q合于u上将~结填料推入腔的深部Qƈ用压盖对木质轴套施加一定压力，使之预压~，注意保持~结填料在腔底部qx。（3Q注入合胶泥状填必边注入边用木质轴套压紧Q最后再用编l聚四氟乙烯压在填料腔的外边Q均匀上紧压盖Q同时用手{动主_使装填后的压紧力于抛物U分布，然后压盖稍放松Q填料装填完毕。进行运转试验，刚启动运转时Q泄漏情况以间断滴漏ZQ当泄漏增大Ӟ适当调紧压盖螺栓。若发热q大Q将螺栓放松一下。运行正常后Q泄漏基本停止。试q行60h后，打开填料密封腔观察，~结聚四氟乙烯端环Ş状保持完_混合软填料没有摔出现象，轴上毫无损q象?/p>
<p>5 l论</p>
<p>Q?Q?l合式Y填料有效提高了܇的机械效率，减少了对轴的损。由于填料压盖处可保持长期不滴漏Q保护环境?/p>
<p>Q?Q?l护保养方便Q在泄漏量大Ӟ可进行不停工注入填料Qg长了늚q箋工作旉Q节U了人工和维修的费用。据初步估算节约的能耗每台܇每年节约上万元?/p>
<p>Q?Q?l合式Y填料hqK的应用h倹{?br>
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