【摘要】：為了提高大間隙條件下磁性液體密封的耐壓能力,本文創(chuàng)造性地提出了一種新型的階梯式磁性液體密封結(jié)構(gòu),采用實驗和數(shù)值模擬的方法研究了發(fā)散型與聚合型階梯式磁性液體密封的耐壓機理,由此推導(dǎo)出發(fā)散型與聚合型階梯式磁性液體密封的耐壓理論。 采用等效磁路法設(shè)計了階梯式磁性液體密封結(jié)構(gòu),采用磁場有限元法對階梯式磁性液體密封結(jié)構(gòu)進行了優(yōu)化。 采用磁場有限元法研究了階梯式磁性液體密封的泄漏位置,數(shù)值模擬了階梯式磁性液體密封間隙內(nèi)的磁場分布,得到不同徑向和軸向密封間隙下發(fā)散型與聚合型階梯式磁性液體密封的理論耐壓能力。 實驗研究了徑向密封間隙高度、軸向密封間隙寬度、磁性液體種類、磁性液體體積量以及轉(zhuǎn)速對發(fā)散型與聚合型階梯式磁性液體密封耐壓能力的影響,并與發(fā)散型與聚合型階梯式磁性液體密封的理論耐壓值進行了比較和分析。結(jié)果表明,發(fā)散型與聚合型階梯式磁性液體密封耐壓能力與其理論耐壓能力符合的很好；發(fā)散型與聚合型階梯式磁性液體密封耐壓能力隨著磁性液體飽和磁化強度的增加而增加,隨著磁性液體量的增加而增加并趨于穩(wěn)定,隨著轉(zhuǎn)速的增加保持不變。 實驗研究了非階梯式磁性液體密封的耐壓能力,并將發(fā)散型和聚合型階梯式磁性液體密封耐壓能力與非階梯式磁性液體密封耐壓能力實驗值進行了比較和分析。結(jié)果表明,當(dāng)軸向密封間隙寬度較小時,階梯式磁性液體密封性能顯著大于非階梯式磁性液體密封性能,但當(dāng)軸向密封間隙寬度較大時,階梯式磁性液體密封相對非階梯式磁性液體密封的優(yōu)勢變得越小。
[Abstract]:In order to improve the pressure resistance of magnetic liquid seal under the condition of large clearance, a new stepped magnetic liquid seal structure is proposed creatively in this paper. The pressure resistance mechanism of divergent and polymeric stepped magnetic liquid seals is studied by means of experiment and numerical simulation, and the pressure resistance theory of starting and aggregating stepped magnetic liquid seals is derived. The stepped magnetic liquid seal structure is designed by equivalent magnetic circuit method, and the stepped magnetic liquid seal structure is optimized by magnetic field finite element method. The leakage position of stepped magnetic liquid seal is studied by magnetic field finite element method, and the magnetic field distribution in the clearance of stepped magnetic liquid seal is simulated. The theoretical pressure resistance of divergent and aggregated step magnetic fluid seals with different radial and axial sealing clearances is obtained. The effects of the height of radial seal clearance, the width of axial seal clearance, the type of magnetic liquid, the volume of magnetic liquid and the rotating speed on the pressure resistance of divergent and aggregated stepped magnetic liquid seal were studied. The theoretical pressure resistance values of divergent and polymer step magnetic fluid seals are compared and analyzed. The results show that the pressure resistance of divergent and polymeric stepped magnetic liquid seals is in good agreement with their theoretical pressure resistance. The pressure resistance of divergent and polymeric stepped magnetic liquid seals increases with the increase of saturation magnetization of magnetic liquid, increases and tends to be stable with the increase of magnetic liquid content, and remains unchanged with the increase of rotating speed. The pressure resistance of non-stepped magnetic liquid seal is studied experimentally. the pressure resistance of divergent and aggregated stepped magnetic liquid seal is compared and analyzed with the experimental value of non-stepped magnetic liquid seal. The results show that when the clearance width of axial seal is small, the sealing performance of stepped magnetic liquid is significantly higher than that of non-stepped magnetic liquid, but when the width of axial seal clearance is large, The advantage of step magnetic fluid seal is smaller than that of non step magnetic liquid seal.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TB42

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