A seal assembly for preventing the flow of fluid includes a rotating component having a first sealing surface, a stationary component coaxial with the rotating component and having a second sealing surface with the second sealing surface configured to form a seal with the first sealing surface of the rotating component, and indents in one of the first sealing surface and the second sealing surface. The indents are configured to control a width of a gap between the first sealing surface and the second sealing surface to allow fluid to flow into the gap. At least two of the indents are at least partially aligned in the radial direction.

A seal assembly for preventing the flow of fluid includes a rotating component having a first sealing surface, a stationary component coaxial with the rotating component and having a second sealing surface with the second sealing surface configured to form a seal with the first sealing surface of the rotating component, and indents in one of the first sealing surface and the second sealing surface. The indents are configured to control a width of a gap between the first sealing surface and the second sealing surface to allow fluid to flow into the gap. At least two of the indents are at least partially aligned in the radial direction.

An oil passage structure, includes a first tubular member configured to externally fit on a support wall portion and a second tubular member configured to internally fit in the support wall portion and supports an outer periphery of the shaft. An oil passage along a rotation axis direction of the shaft is provided at at least one of a location between the support wall portion and the first tubular member and a location between the support wall portion and the second tubular member.

A circumferential seal assembly suitable for forming a thin film between a rotatable runner and a sealing ring is presented. The assembly includes an annular seal housing, a rotatable runner, an annular seal ring, and a plurality of groove structures. Each groove structure includes a groove and an optional feed groove. The groove includes at least two adjoining steps defined by base walls arranged to decrease depthwise. Two adjoining base walls are disposed about a base shoulder. Each base shoulder locally redirects a longitudinal flow to form an outward radial flow in the direction of the annular seal ring. The base walls are bounded by and intersect a pair of side walls. A side wall includes side shoulders which narrows the groove widthwise and locally redirects the longitudinal flow to form a lateral flow in the direction of the other side wall. Outward and lateral flows separately or in combination enhance stiffness of a thin-film layer between the annular seal ring and the rotatable runner.

A circumferential seal assembly suitable for forming a thin film between a rotatable runner and a sealing ring is presented. The assembly includes an annular seal housing, a rotatable runner, an annular seal ring, and a plurality of groove structures. Each groove structure includes a groove and an optional feed groove. The groove includes at least two adjoining steps defined by base walls arranged to decrease depthwise. Two adjoining base walls are disposed about a base shoulder. Each base shoulder locally redirects a longitudinal flow to form an outward radial flow in the direction of the annular seal ring. The base walls are bounded by and intersect a pair of side walls. A side wall includes side shoulders which narrows the groove widthwise and locally redirects the longitudinal flow to form a lateral flow in the direction of the other side wall. Outward and lateral flows separately or in combination enhance stiffness of a thin-film layer between the annular seal ring and the rotatable runner.

A sealing system includes: a double mechanical seal having a pump-side sealing mechanism (10, 12) and an atmospheric-side sealing mechanism (11, 13); a pump mechanism (19) driven by a rotational shaft (1); a first medium circulation line (30) for circulating a fluid barrier-and-cooling medium between a first chamber (22a) and a second chamber (22b), the first medium circulation line (30) being coupled to the first chamber (22a) and the second chamber (22b), the fluid barrier-and-cooling medium being different from a fluid handled by the centrifugal pump; a heat exchanger (21) and a shut-off valve (28) attached to the first medium circulation line (30); a second medium circulation line (31) bypassing the shut-off valve (28); and a medium pressurizing pump (45) and an on-off valve (23) attached to the second medium circulation line (31).

The present invention provides a work hood that allows for free rotation in a work box to provide a wide work area and easy decontamination of a sealing portion present at the boundary between the work hood and the work box. A rotation support for rotatably supporting the entire half suit is provided. The rotation support includes a base portion, a rotating portion, a bearing portion, a sealing member, and a communication hole. The base portion is airtightly and annularly provided around an opening, and the rotating portion is provided around the base portion through the bearing portion, with a hem portion of the half suit being fixed to the rotating portion. The sealing member is annularly provided in an annular space formed by the base portion and the rotating portion so as to separate the work box and the external environment. The communication hole is provided so as to lead to the external environmental side from the annular small space side formed by the sealing member together with the base portion, the rotating portion, and the bearing portion, and is connected to a supply means for supplying a decontamination gas and the like to the inside of the small space and to a suction means for sucking clean air and the like from the inside of the small space.

A seal includes a mating ring that rotates relative to a carbon primary ring at a seal interface. A buffer gas is provided into the seal and passes from the back of the primary ring to the seal interface. The seal can be used as a separation seal or in combination with another seal.

A sealing device for a gas-liquid two-phase fluid medium under variable working conditions includes a rotating shaft and a housing, and a chamber formed by the housing is configured to accommodate the gas-liquid two-phase fluid medium. The sealing device further includes a labyrinth sealing mechanism and a fluid dynamic-pressure mechanical sealing mechanism with double end faces, where the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism with double end faces conduct mutual synergetic effect. Sealing buffer chambers are arranged between the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism; the fluid dynamic-pressure mechanical sealing mechanism is provided with stationary rings and movable rings, where the stationary rings and the movable rings oppositely abut against with each other.

A pump system includes a housing, a lubricant system, and control circuitry. The housing includes a pump chamber defined by the housing and a throat seal. The lubricant system includes a lubricant pump, a lubricant gallery defined within the housing of the main pump, and a lubricant circuit fluidly connecting the lubricant pump and the lubricant gallery. The throat seal is disposed adjacent to and between the pump chamber and the lubricant gallery. The control circuitry is configured to cause the lubricant pump to pump a purge volume of lubricant through the lubricant system, cause the lubricant pump to stop pumping for a first time period after the lubricant pump has pumped the purge volume, and cause the lubricant pump to pump the purge volume of lubricant through the lubricant system after the first time period.