公开(公告)号：JP2000186573A

公开(公告)日：2000-07-04

申请号：JP36705999

申请日：1999-12-24

Applicant: UNITED TECHNOLOGIES CORP

Inventor： STANLEY K KOVARSKI ,  DONALD J KOWALSKI ,  COLIN D CRAIG

IPC: F02C7/28 ,  F01D11/00 ,  F16J15/44

Abstract: PROBLEM TO BE SOLVED: To provide an increased life for the seal of a gas turbine engine and increase effectiveness and to balance lowering of a pressure between seal stages. SOLUTION: A plurality of seal stages 50 are provided to minimize leakage of high pressure air from a high pressure cavity 84 to a low pressure cavity 80. The seal stage 50 comprises an upper stream seal stage 86 adjoining the high pressure cavity 84; and a downstream seal stage 90 adjoining the low pressure cavity 80. Each seal stage comprises seal plates 94 and 100; and at least one of seals 110 and 108. The downstream seal plate 100 contains a plurality of bleed holes 136 to regulate an air amount and balances pressure lowering between seal stages. By substantially equalizing pressure lowering between the seal stages, wear of the downstream seal 108 is decreased and an effective life and effectiveness are increased.