Abstract: An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid thereinto and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with a reverse inclined groove which is provided on the side of the sealing target fluid of the inclined groove, extends in a reverse direction with respect to the inclined groove, and generates a dynamic pressure.

Abstract: An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with at least a concave portion disposed between adjacent two of the fluid introduction grooves in the circumferential direction.

Abstract: A mechanical seal (100) includes a sleeve (130) fixed to a rotating shaft (200), wherein the sleeve (130) has: a first annular portion (131) that has a step having an inner diameter and an outer diameter on a sealed fluid (F) side thereof that are larger than those of on an opposite side thereto, an inner peripheral surface of a small diameter portion (131a) on the first annular portion (131) is fitted on the rotating shaft (200), and a stationary ring (110) is disposed on the small diameter portion (131a), a rotating ring (120) is disposed between a large diameter portion (131b) and an inner peripheral surface of the rotating ring (120) is sealed, S2÷S1?1 is satisfied where S1 is a sliding area between the stationary ring (110) and the rotating ring (120), S2 is a pressure receiving area where the stationary ring (110) receives a pressure effect of the rotating ring (120) due to a pressure of the sealed fluid (F).

Abstract: A mechanical seal (100) includes a sleeve (130) fixed to a rotating shaft (200), wherein the sleeve (130) has: a first annular portion (131) that has a step having an inner diameter and an outer diameter on a sealed fluid (F) side thereof that are larger than those of on an opposite side thereto, an inner peripheral surface of a small diameter portion (131a) on the first annular portion (131) is fitted on the rotating shaft (200), and a stationary ring (110) is disposed on the small diameter portion (131a), a rotating ring (120) is disposed between a large diameter portion (131b) and an inner peripheral surface of the rotating ring (120) is sealed, S2÷S1?1 is satisfied where S1 is a sliding area between the stationary ring (110) and the rotating ring (120), S2 is a pressure receiving area where the stationary ring (110) receives a pressure effect of the rotating ring (120) due to a pressure of the sealed fluid (F).

Abstract: A mechanical sealing device includes a stationary slide ring, a rotary slide ring which rotary slides and closely contacts the stationary slide ring, an O-ring located between an inner bore of the rotary slide ring and the rotary shaft. An annular ring member has a relatively lower gas permeability than that of the O-ring and is provided in the inner bore of the rotary slide ring so as to adjoin the O-ring at an atmosphere side of the sealing device, wherein the following expression D1<D2<D3 is satisfied. D1 is a diameter of the rotary shaft, D2 is an inner diameter of the annular projected portion of the ring member, and D3 is an inner diameter of a portion at the atmosphere side from the ring member in the inner bore of the rotary slide ring.

Abstract: A mechanical sealing device comprises a stationary slide ring 10, a rotary slide ring 20 which rotary slides and closely contacts with said stationary slide ring 10, an O-ring equipped between a inner bore of said rotary slide ring 20 and said rotary shaft 200. A mechanical sealing device further comprises an annular ring member 60a having relatively lower gas permeability in response to that of said O-ring 30; said ring member 60a is provided in said inner bore of the rotary slide ring 20 so as to adjoin said O-ring 30 at atmosphere side; and satisfies a following conditional expression (1). Note that in the expression (1), D1 is a diameter of said rotary shaft 200, D2 is an inner diameter of said ring member 60a, D3 is an inner diameter of a portion at atmosphere side from said ring member 60a in the inner bore of said rotary side slid ring 20.