SEAL STRUCTURE AND TURBOMACHINE

• Main Authors: FUJIKAWA KENICHI, MATSUMOTO KAZUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 07.09.2017
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; CYLINDERS; ENGINE PLANTS IN GENERAL; ENGINEERING ELEMENTS AND UNITS; GAS-TURBINE PLANTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PISTONS; SEALINGS; STEAM ENGINES; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a seal structure and a turbomachine capable of effectively restricting the unstable oscillation.SOLUTION: A seal structure comprises: a rotation structure 4 rotating about a shaft center line CL in a prescribed direction; a stationary structure 10 facing in a radial direction R with a gap Gd on the outer peripheral side of the rotation structure 4, the seal structure restricts the flow of leak flow SL of working fluid from the gap Gd. The stationary structure 10 includes a cavity 12 accommodating the rotation structure 4; on the inner peripheral surface 13 of the cavity 12, a seal fin 6 extending toward on the shaft center line CL is provided; and a plurality of stationary side recesses 14 are provided along the flow direction of the leak flow SL. A second stationary side recess 14B disposed on the immediate downstream side of a first stationary side recess 14A in the flow direction has a depth dimension set small in comparison with the first stationary side recess 14A on the most upstream side in the flow direction.SELECTED DRAWING: Figure 2 【課題】不安定振動を効果的に抑制できるようにした、シール構造及びターボ機械を提供する。【解決手段】軸心線ＣＬ周りに所定方向に回転する回転構造体４と、回転構造体４の外周側に隙間Ｇｄを空けて径方向Ｒに対向する静止構造体１０との間の前記隙間Ｇｄから、作動流体のリーク流ＳＬの流れを抑制する、シール構造であって、静止構造体１０には、回転構造体４を収容するキャビティ１２が備えられると共に、このキャビティ１２の内周面１３には、軸心線ＣＬ側に向かって延在するシールフィン６が設けられると共に、リーク流ＳＬの流れ方向に沿って複数の静止側凹所１４が設けられ、前記流れ方向で最上流側の第１静止側凹所１４Ａよりも、前記流れ方向で第１静止側凹所１４Ａの直下流側に配置された第２静止側凹所１４Ｂのほうが、深さ寸法を小さく設定さる。【選択図】図２