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ghostshell · 09-19-2008, 12:45 AM

CEO2008GAME · 10-03-2008, 11:15 AM

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ghij550 · 10-18-2008, 07:20 AM

磁力泵的工作原理　　将n对磁体(n为偶数)按规律排列组装在磁力传动器的内、外磁转子上，使磁体部分相互组成完整藕合的磁力系统。当内、外两磁极处于异极相对，即两个磁极间的位移角Φ＝0，此时磁系统的磁能最低；当磁极转动到同极相对，即两个磁极间的位移角Φ＝2π/n，此时磁系统的磁能最大。去掉外力后，由于磁系统的磁极相互排斥，磁力将使磁体恢复到磁能最低的状态。于是磁体产生运动，带动磁转子旋转。　　结构特点　　1．永磁体　　由稀土永磁材料制成的永磁体工作温度范围广(-45－400℃)，矫顽力高，磁场方向具有很好的各向异性，在同极相接近时也不会发生退磁现象，是一种很好的磁场源。　　磁力泵图片2．隔离套　　在采用金属隔离套时，隔离套处于一个正弦交变的磁场中，在垂直于磁力线方向的截面上感应出涡电流并转化成热量。涡流的表达式为：其中Pe－涡流；K—常数；n—泵的额定转速；T－磁传动力矩；F －隔套内的压力；D－隔套内径；一材料的电阻率； —材料的抗拉强度。当泵设计好后，n、T是工况给定的，要降低涡流只能从F、D等方面考虑。选用高电阻率、高强度的非金属材料制作隔离套，在降低涡流方面效果十分明显。　　3．冷却润滑液流量的控制　　自吸式磁力泵运转时，必须用少量的液体对内磁转子与隔离套之间的环隙区域和滑动轴承的摩擦副进行冲洗冷却。冷却液的流量通常为泵设计流量的2%-3%，内磁转子与隔离套之间的环隙区域由于涡流而产生高热量。当冷却润滑液不够或冲洗孔不畅、堵塞时，将导致介质温度高于永磁体的工作温度，使内磁转子逐步失去磁性，使磁力传动器失效。当介质为水或水基液时，可使环隙区域的温升维持在3-5℃；当介质为烃或油时，可使环隙区域的温升维持在5-8℃。　　4．滑动轴承　　氟塑料磁力泵滑动轴承的材料有浸渍石墨、填充聚四氟乙烯、工程陶瓷等。由于工程陶瓷具有很好的耐热、耐腐蚀、耐摩擦性能，所以磁力泵的滑动轴承多采用工程陶瓷制作。由于工程陶瓷很脆且膨胀系数小，所以轴承间隙不得过小，以免发生抱轴排污泵事故。　　由于磁力泵的滑动轴承以所输送的介质进行润滑，所以应根据不同的介质及使用工况，选用不同的材质制作轴承。　　5．保护措施　　当磁力传动器的从动部件在过载情况下运行或转子卡死时，磁力传动器的主、从动部件会自动滑脱，保护机泵。此时磁力传动器上的永磁体在主动转子交变磁场的作用下，将产生涡损、磁损，造成永磁体温度升高，磁力传动器滑脱失效。

sellwowgold1 · 12-03-2008, 03:38 PM

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09-19-2008, 12:45 AM	#1 (permalink)
ghostshell Junior Member Join Date: Aug 2008 Age: 18 Posts: 15 Thanks: 0 Thanked 1 Time in 1 Post	taare zameen par movie Taare Zameen Par - Dont Miss It Taare Zameen Par Synopsis : Quote: -=eHsAn™=- is an eight-year-old whose world is filled with wonders that no one else seems to appreciate; colours, fish, dogs and kites are just not important in the world of adults, who are much more interested in things like homework, marks and neatness. And -=eHsAn™=- just cannot seem to get anything right in cl***** When he gets into far more trouble than his parents can handle, he is packed off to a boarding school to be disciplined. Things are no different at his new school, and -=eHsAn™=- has to contend with the added trauma of separation from his family. One day a new art teacher bursts onto the scene, Ram Shankar Nikumbh, who infects the students with joy and optimism. He breaks all the rules of how things are done by asking them to think, dream and imagine, and all the children respond with enthusiasm, all except -=eHsAn™=-. Nikumbh soon realizes that -=eHsAn™=- is very unhappy, and he sets out to discover why. With time, patience and care, he ultimately helps -=eHsAn™=- find himself. Quote: Producer Aamir Khan Director Aamir Khan Star Cast Aamir Khan...... Ram Shankar Nikumbh Tanay Chheda...... Rajan Damodaran Darsheel Safary...... -=eHsAn™=- Tisca Chopra...... Maya Awasthi / Mama Sachet Engineer...... Yohaan Awasthi / Dada Vipin Sharma...... Mr. Awasthi / Papa Lalitha Lajmi DVDRip Code: RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting Code: RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting Subs RapidShare: Easy Filehosting Code: MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service MEGAUPLOAD - The leading online storage and file delivery service Subs:- MEGAUPLOAD - The leading online storage and file delivery service Code: RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting Quote: Taare Zameen Par(2008) 2CD DVDRIP xvid subs [Direct Links] CD1 Code: ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup Subs:- ADrive.com – 50GB of Free Online Storage & Backup CD2:- ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup ADrive.com – 50GB of Free Online Storage & Backup Subs:- ADrive.com – 50GB of Free Online Storage & Backup Code: RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting RapidShare: Easy Filehosting

10-03-2008, 11:15 AM	#2 (permalink)
CEO2008GAME Senior Member Join Date: Sep 2008 Posts: 280 Thanks: 0 Thanked 0 Times in 0 Posts	Wow cd key, to buy or not to buy More MMORPG players will buy wow cd key to enjoy new stories. The customers who is tired of the old stories and want to leave may continue buying world of warcraft cd key and gold for the new stories reason.While for the game product company, they wanna Warhammer online power leveling to flourish their game but do not wanna it to disturb even destroy the balance of the game itself. Game studios are suffering force-out. And some websites are suffering force-out too. Safe warhammer power leveling websites are in need now. There are still many websites which provide safe war power leveling. Friends, do not miss item4u.com. It provides the best service.

10-18-2008, 07:20 AM	#3 (permalink)
ghij550 Senior Member Join Date: Sep 2008 Posts: 303 Thanks: 0 Thanked 1 Time in 1 Post	磁力泵磁力泵的工作原理　　将n对磁体(n为偶数)按规律排列组装在磁力传动器的内、外磁转子上，使磁体部分相互组成完整藕合的磁力系统。当内、外两磁极处于异极相对，即两个磁极间的位移角Φ＝0，此时磁系统的磁能最低；当磁极转动到同极相对，即两个磁极间的位移角Φ＝2π/n，此时磁系统的磁能最大。去掉外力后，由于磁系统的磁极相互排斥，磁力将使磁体恢复到磁能最低的状态。于是磁体产生运动，带动磁转子旋转。　　结构特点　　1．永磁体　　由稀土永磁材料制成的永磁体工作温度范围广(-45－400℃)，矫顽力高，磁场方向具有很好的各向异性，在同极相接近时也不会发生退磁现象，是一种很好的磁场源。　　磁力泵图片2．隔离套　　在采用金属隔离套时，隔离套处于一个正弦交变的磁场中，在垂直于磁力线方向的截面上感应出涡电流并转化成热量。涡流的表达式为：其中Pe－涡流；K—常数；n—泵的额定转速；T－磁传动力矩；F －隔套内的压力；D－隔套内径；一材料的电阻率； —材料的抗拉强度。当泵设计好后，n、T是工况给定的，要降低涡流只能从F、D等方面考虑。选用高电阻率、高强度的非金属材料制作隔离套，在降低涡流方面效果十分明显。　　3．冷却润滑液流量的控制　　自吸式磁力泵运转时，必须用少量的液体对内磁转子与隔离套之间的环隙区域和滑动轴承的摩擦副进行冲洗冷却。冷却液的流量通常为泵设计流量的2%-3%，内磁转子与隔离套之间的环隙区域由于涡流而产生高热量。当冷却润滑液不够或冲洗孔不畅、堵塞时，将导致介质温度高于永磁体的工作温度，使内磁转子逐步失去磁性，使磁力传动器失效。当介质为水或水基液时，可使环隙区域的温升维持在3-5℃；当介质为烃或油时，可使环隙区域的温升维持在5-8℃。　　4．滑动轴承　　氟塑料磁力泵滑动轴承的材料有浸渍石墨、填充聚四氟乙烯、工程陶瓷等。由于工程陶瓷具有很好的耐热、耐腐蚀、耐摩擦性能，所以磁力泵的滑动轴承多采用工程陶瓷制作。由于工程陶瓷很脆且膨胀系数小，所以轴承间隙不得过小，以免发生抱轴排污泵事故。　　由于磁力泵的滑动轴承以所输送的介质进行润滑，所以应根据不同的介质及使用工况，选用不同的材质制作轴承。　　5．保护措施　　当磁力传动器的从动部件在过载情况下运行或转子卡死时，磁力传动器的主、从动部件会自动滑脱，保护机泵。此时磁力传动器上的永磁体在主动转子交变磁场的作用下，将产生涡损、磁损，造成永磁体温度升高，磁力传动器滑脱失效。

12-03-2008, 03:38 PM	#4 (permalink)
sellwowgold1 Senior Member Join Date: Nov 2008 Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	sell wow gold sell wow gold sell ffxi gil, sell eve online isk, sell maplestory mesos http://www.virdeal.com

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