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磁力泵的特點(diǎn) |
1．永磁體
1. Magnets
由稀土永磁材料制成的永磁體工作溫度范圍廣(-45－400℃)，矯頑力高，磁場(chǎng)方向具有很好的各向異性，在同極相接近時(shí)也不會(huì)發(fā)生退磁現(xiàn)象，是一種很好的磁場(chǎng)源。
From the rare-earth permanent magnetic materials, permanent magnet made of a wide range of body temperature (-45-400 ℃), high coercivity, magnetic anisotropy direction has a very good, with a very similar demagnetization does not occur when approaching the phenomenon of is a good source of the magnetic field.
2.隔離套
2. Isolation sets
在采用金屬隔離套時(shí)，隔離套處于一個(gè)正弦交變的磁場(chǎng)中，在垂直于磁力線方向的截面上感應(yīng)出渦電流并轉(zhuǎn)化成熱量。渦流的表達(dá)式為： 。其中Pe－渦流；K—常數(shù)；n—泵的額定轉(zhuǎn)速；T－磁傳動(dòng)力矩；F－隔套內(nèi)的壓力；D－隔套內(nèi)徑； 一材料的電阻率； —材料的抗拉強(qiáng)度。當(dāng)泵設(shè)計(jì)好后，n、T是工況給定的，要降低渦流只能從F、D、 、 等方面考慮。選用高電阻率、高強(qiáng)度的非金屬材料制作隔離套，在降低渦流方面效果十分明顯。
Sets in when the metal isolation, isolation sets in a sinusoidal alternating magnetic fields, in the direction perpendicular to the magnetic field lines out of the cross section induced eddy currents and transformed into heat. Swirl in the expression as follows:. Where Pe-eddy; K-constant; n-pump rated speed; T-magnetic driving torque; F-compartment comprising the pressure; D-separated sets of diameter; a material resistivity; - tensile strength of materials. When the pump design is getting better, n, T is the given conditions, to reduce eddy current only from F, D,, and other considerations. Use of high resistivity, high-strength non-metallic material isolated sets of results in reducing the eddy current context is very obvious.
3．冷卻潤(rùn)滑液流量的控制
3. Lubrication Liquid Flow Control
泵運(yùn)轉(zhuǎn)時(shí)，必須用少量的液體對(duì)內(nèi)磁轉(zhuǎn)子與隔離套之間的環(huán)隙區(qū)域和滑動(dòng)軸承的摩擦副進(jìn)行沖洗冷卻。冷卻液的流量通常為泵設(shè)計(jì)流量的2%-3%，內(nèi)磁轉(zhuǎn)子與隔離套之間的環(huán)隙區(qū)域由于渦流而產(chǎn)生高熱量。當(dāng)冷卻潤(rùn)滑液不夠或沖洗孔不暢、堵塞時(shí)，將導(dǎo)致介質(zhì)溫度高于永磁體的工作溫度，使內(nèi)磁轉(zhuǎn)子逐步失去磁性，使磁力傳動(dòng)器失效。當(dāng)介質(zhì)為水或水基液時(shí)，可使環(huán)隙區(qū)域的溫升維持在3-5℃；當(dāng)介質(zhì)為烴或油時(shí)，可使環(huán)隙區(qū)域的溫升維持在5-8℃。
Pump running, you must use a small amount of fluid set of internal magnetic separation between the rotor and the annulus area and sliding friction bearings for flushing cooling deputy. The flow of coolant pump design flow is usually 2% -3%, within a set of magnetic separation between the rotor and the annulus region due to eddy current arising from high-calorie. When the cooling lubricant inadequate or poor flushing holes to plug, it will lead to medium temperature is higher than the operating temperature permanent magnets, so that the gradual loss of magnetic properties within a magnetic rotor, so that magnetic transmission failure. When the medium is water or water-based fluid, the annulus region temperature can be maintained at 3-5 ℃; when the medium is hydrocarbon or oil when the temperature rise can annulus region maintained at 5-8 ℃.
4．滑動(dòng)軸承
4. Bearing
磁力泵滑動(dòng)軸承的材料有浸漬石墨、填充聚四氟乙烯、工程陶瓷等。由于工程陶瓷具有很好的耐熱、耐腐蝕、耐摩擦性能，所以磁力泵的滑動(dòng)軸承多采用工程陶瓷制作。由于工程陶瓷很脆且膨脹系數(shù)小，所以軸承間隙不得過小，以免發(fā)生抱軸事故。
Magnetic pump sliding bearing materials impregnated graphite, PTFE and engineering ceramics. As the engineering ceramics have good heat resistance, corrosion, rubbing performance, so the sliding bearing magnetic pump to use more production of engineering ceramics. As the engineering ceramics is very crisp and the expansion coefficient is small, so bearing clearance shall not be too small to hold shaft in order to avoid an accident.
由于磁力泵的滑動(dòng)軸承以所輸送的介質(zhì)進(jìn)行潤(rùn)滑，所以應(yīng)根據(jù)不同的介質(zhì)及使用工況，選用不同的材質(zhì)制作軸承。
As the magnetic pump to the sliding bearing lubrication delivery media, it should be according to different media and the use of working conditions, use of different materials produced bearings.
5．保護(hù)措施
5. Protection
當(dāng)磁力傳動(dòng)器的從動(dòng)部件在過載情況下運(yùn)行或轉(zhuǎn)子卡死時(shí)，磁力傳動(dòng)器的主、從動(dòng)部件會(huì)自動(dòng)滑脫，保護(hù)機(jī)泵。此時(shí)磁力傳動(dòng)器上的永磁體在主動(dòng)轉(zhuǎn)子交變磁場(chǎng)的作用下，將產(chǎn)生渦損、磁損，造成永磁體溫度升高，磁力傳動(dòng)器滑脫失效。
When the magnetic actuator of the slave parts in case of overload operation or rotor stuck, the magnetic actuator of the master, slave components will automatically slip to protect pump. At this point magnetic actuator in an active permanent magnet on the rotor under the action of alternating magnetic field will produce eddy loss, magnetic loss, resulting in permanent magnet temperature, magnetic transmission slip failure. |
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