The Research Of The Face Special Pressure And Its Impacts On The Sealing Performance For Ship Stern—Shaft Mechanical Seals

Mechanical seal with leak less,good sealing performance,durability etc, isgradually applied in the ship stern—shaft seal, and become an important part in the shippropelling system. The complex coupling of sealing ring lead seal face prone to localhigh temperature or deformation, therefore the appropriate face special pressure ofdynamic ring and static ring is very important. Development of the face special pressurefor ship stern—shaft mechanical seal research and its impacts on the sealingperformance have important significance and practical value.In this thesis, the ship stern—shaft mechanical seal was chosen as the researchobject to conduct the theoretical and experimental research.The related theoretical wereresearched intensively, which includes the establishment of the mathematical model forthe face special pressure, temperature field, displacement of deformation, leakage andother aspects of the theoretical analysis. On the other hand, the experiments on theindependently designed test platform were conducted to verify the research results.1. The mathematical model of the face special pressure is constructed. The sealingring structure is simplified and the dynamic ring is took as the balance body to analysisload for driving the relations of the face special pressure and other parameters andanalyzing the impact of each parameter to the face special pressure.The result shows,when the shape of sealing ring and the sealing medium are determined, only the pretightening force which applied to the dynamic ring initial has impact on the face specialpressure.2. With the finite element method software ANSYS, analysis the sealingcharacteristics of the seal ring. The sealing ring’s steady coupled thermal—structuremodel and coupled thermal—mechanical model were established, then analyze thesemodel. The surface temperature distribution of static ring, the deformation ofdisplacement, the size of taper were received; At the same time, the three—dimensionalmodel of static ring was established, to analyze the face special pressure and thedeformation of displacement; From the microscopic point of view and the macroperspective, the theoretical calculations of leakage was conducted respectively andoverlap them, to get the leakage under different face special pressure.3. With the experiment, we research and analysis the effect of the face specialpressure on the performance of the mechanical seal. Through ship stern—shaftmechanical seal designed independently, this thesis evaluated the performance of sealing from various view, such as measuring the temperature of the sealing face, theface special pressure, leakage, the deformation of displacement and other date. Researchand analyze this date which was measured and the theoretical date. The test platform isin good agreement with the theoretical calculating results. Therefore, the theoreticalconclusions drawn are confirmed based on the experimental results.