초록 ▼

A circumferential film-riding seal operative in a gaseous or liquid environment about a rotating shaft is provided so that it is able to function with extended lifetime, low leakage, and a high-pressure difference thereacross. These characteristics are achieved by the employment of a segmented seal

A circumferential film-riding seal operative in a gaseous or liquid environment about a rotating shaft is provided so that it is able to function with extended lifetime, low leakage, and a high-pressure difference thereacross. These characteristics are achieved by the employment of a segmented seal ring mounted in tandem with a floating load ring surrounding the rotating shaft. The seal ring has a bore surface thereon confronting the shaft, and the bore surface has a circumferential lift region located downstream of a circumferential bearing region. The bearing region has additional lift grooves either in the seal ring or in the shaft surface confronting the bearing region, together with feed grooves connecting the additional lift grooves, respectively, to a higher-pressure region adjacent the shaft. In certain embodiments the shaft has a sleeve secured thereto, which confronts the bore surface of the seal ring and the load ring, and wherein the additional lift grooves and respective feed grooves may be formed in the shaft sleeve. Also, the shaft sleeve may have a segment of reduced diameter formed thereon so that the diameter of the sleeve confronting the load ring is smaller than the diameter confronting the seal ring to provide pressure balance across the load ring.

대표청구항 ▼

A circumferential film-riding seal operative in a gaseous or liquid environment about a rotating shaft is provided so that it is able to function with extended lifetime, low leakage, and a high-pressure difference thereacross. These characteristics are achieved by the employment of a segmented seal

A circumferential film-riding seal operative in a gaseous or liquid environment about a rotating shaft is provided so that it is able to function with extended lifetime, low leakage, and a high-pressure difference thereacross. These characteristics are achieved by the employment of a segmented seal ring mounted in tandem with a floating load ring surrounding the rotating shaft. The seal ring has a bore surface thereon confronting the shaft, and the bore surface has a circumferential lift region located downstream of a circumferential bearing region. The bearing region has additional lift grooves either in the seal ring or in the shaft surface confronting the bearing region, together with feed grooves connecting the additional lift grooves, respectively, to a higher-pressure region adjacent the shaft. In certain embodiments the shaft has a sleeve secured thereto, which confronts the bore surface of the seal ring and the load ring, and wherein the additional lift grooves and respective feed grooves may be formed in the shaft sleeve. Also, the shaft sleeve may have a segment of reduced diameter formed thereon so that the diameter of the sleeve confronting the load ring is smaller than the diameter confronting the seal ring to provide pressure balance across the load ring. e number of letters in each word that the player builds from letters on the exposed faces of the dice, augmented by an element of chance introduced by Pick-a-Card cards and/or Keep-a-Letter for Life cards. The player receives one of these cards when his pawn lands on a designated space in the pathway. Additionally, movement controlling spaces in the path come into play when a pawn lands directly on one of these spaces. The board game thus combines vocabulary skills, good luck, and strategic planning, to maintain the interest of each player over an extended period of time. trand. 6. A method of operating a sheet-braking system for a sheet delivery of a sheet-processing machine, which comprises, during operation: revolving a braking belt with periodic decelerating and accelerating phases; passing the braking belt, including a braking strand thereof, over a suction region providing a suction effect passing through the braking strand; and covering the suction region throughout the duration of a respective decelerating phase, by a respective sheet deposited on the braking strand. 7. The method according to claim 6, which comprises terminating the respective decelerating phase upon the arrival of the trailing edge of the respective sheet at the suction region. 8. The method according to claim 6, which includes beginning a respective decelerating phase of the braking belt after the trailing edge of a respective sheet deposited on the braking strand has reached the braking strand.