| The paper introduces current situation and development trend of dry gas seal especially, and points out it is necessary to replace humid seal system by dry gas seal. At the same time the technical research state and the application of dry gas seal are introduced both at home and abroad too. Its characteristic and typical structures are given, and the structure and characteristic of the spiral groove seal of the unilateral pump pattern are discussed.The basic principal and general structure of dry gas seal are introduced briefly, and aiming at the characteristics of logarithm spiral curve, the calculation of the pressure to the spiral groove end surface by the theory of narrow groove are given. The method of narrow groove theory and finite element method are utilized to optimize the end surface structure of the spiral groove dry gas seal. The structure of the seal is confirmed on the base of the result.Appointing to the characteristic and operating condition of hydrogen compressor, the carrying capacity, the leakage and the film thickness of the dry gas seal are calculated by the theory of narrow groove. The relation of the film thickness, the leakage and the carrying capacity of the reactions in practical condition are pointed out. It has calculated the load coefficient and spring strength and so on.On the base of practical characteristics of the compressor, tandem seal is chosen. Then the material and the specialty of the seal surface are analyzed, and the control system of tandem seal is designed.The rationality and feasibility of the scheme for the selected seal are verified by the application. The valuable experience is provided for the application and popularization of dry gas seal in the future. |
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