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1、南华大学机械工程学院毕业设计（论文)附 录原文：Mechanical Seal Design Reactor Institute of Electrical and Mechanical Department of General Chen I. Introduction Agitated reactor is chemical, pharmaceutical production in one of the key equipment, its operating efficiency and reliability of the device depends largely on the
2、merits of particular seal high-pressure high-temperature reactor shaft seal is currently the need for specialized solutions problem. China has been setting the standard kettle-type mechanical seal products, 201,202,203,204,205,206, the use of pressure 1 16kgf/cm, shaft diameter is 30 ll0mm. In recen
3、t years, with the petrochemical, pharmaceutical industry, stirred tank reactor reaction pressure, temperature gradually elevated, and the direction towards the development of high performance. Pollution prevention and safety from both, energy conservation point of view of the seal device reliability
4、, longevity, leakage Quantity and economy and other requirements are also increasing. Therefore, the existing standard kettle with mechanical seals can not fully meet their requirements, up to the need to use specially designed working conditions. In this paper, a high temperature autoclave design o
5、f mechanical seal for a brief introduction. Second, the conditions given by the user Device: 300 liter vertical reactor, stirring shaft inserted from the top, single-bearing; Maximum working pressure; 25kgf/cm; Temperature: room temperature 15O Stirring speed: 12O 150rpm; Medium: dilute ammonia + de
6、hydroacetate powder + solvent Biochemistry; Shaft diameter: 30mm, diameter length ratio: 1:50; Axial space: Kamaguchi coupling flange to the back side while the height is about 293mm; Operation: Intermittent operation, stopping frequently to open; Leakage: 3ml / h; Life: 8000 h (one year). Third, te
7、chnical analysis and design According to the conditions and requirements of a given point of view, the mechanical seal is a very harsh operating conditions. The main problems involved: 1. Top loading autoclave technical problems with the nature of the mechanical seal pump mechanical seal completely
8、different, because it is in the vapor space (only the material is liquid when the tank is full), seal prone to dry run. 2. As the medium is the chemical reaction within the reactor, pressure, temperature, material and shape change are always asked, in the stress cycle and the role of thermal cycles,
9、 the seal faces deform easily. 3. Mechanical seal used at room temperature, due to the friction surface of the heating and sealing of the mixing heat will seal the room temperature rise. When used at high temperatures, due to heat conduction within the tank, the temperature will further rise, causin
10、g friction surface of the liquid film evaporation, resulting in dry run, and to promote corrosion, accelerated aging auxiliary ring, resulting in deterioration in the short term sealing performance. 4. Stirring shaft inserted from the top vertical reactor, its diameter longer than large. It is a sin
11、gle support, the amount of its inevitable swing higher. 5. In the reaction process, the mixer blades and fluid material generated by relative motion between the vortex, must be caused by mixing shaft vibration. 6. May also occur for the following reasons axis traverse: (1) uneven or liquid feed is t
12、oo low; (2) formation did not control the reactants, viscosity increases; (3) sudden changes in speed mixer; (4) thermal expansion or pressure and temperature fluctuate. 7. Because the top of the reactor very easy to install seal. Kettle mechanical seal in the structure must be easy to install and r
13、emoval. In the past, mechanical seal failure resulting in performance, many of them are caused by poor installation of the reactor because the existing parts of mechanical seal to the reactor need to install one by one, we should ensure that its accuracy is difficult. According to the conditions giv
14、en by the user and the technical analysis to determine the following basic design: 1. Higher use of safety barrier double end mechanical seal, to ensure the reactor sealed. 2. Sealed from the outside to enter the clean room suitable for the lubrication of cooling liquid resistance sealed, and set th
15、e cooling water jacket, to improve the sealing of the operating conditions 3. The structure of the sealing device, additional bearings to reduce shaft deflection and a rocky ledge. 4. Consider the ease of installation and removal, and economic factors. 4, structural design features According to the
16、design of mechanical seal design, the friction pair material for the surfacing alloy carbon Graphite, supporting ring material: NBR a 4O. Specific technical measures; 1. Consider the pressure fluctuations in the design of the seal by 30kgf/cm. Side sealing surface of the upper atmospheric pressure to bear large, so designed as balanced, 30%, static method supports dual-ring seal 0-ring to
