Abstract: A pumping ring 46 producing an axial flow of sealed flow is secured to a rotary shaft 6 at an axial position different from a rotary ring 56 so that the sealed fluid positioned in the sealed space 33 flows along the axial direction of the rotary shaft 6. A discharge hole 14 is formed on an inner circumferential surface of a seal cover 8 positioned in the downstream side of the axial flow of the sealed fluid resulting from a rotation of the pumping ring 46. An inflow hole 15 is formed in the upstream side of the axial flow of the sealed fluid resulting from the rotation of the pumping ring 46, so that the sealed fluid discharged from the discharge hole 14 returns to the inside of the sealed space from the inflow hole 15.

Abstract: A pumping ring 46 producing an axial flow of sealed flow is secured to a rotary shaft 6 at an axial position different from a rotary ring 56 so that the sealed fluid positioned in the sealed space 33 flows along the axial direction of the rotary shaft 6. A discharge hole 14 is formed on an inner circumferential surface of a seal cover 8 positioned in the downstream side of the axial flow of the sealed fluid resulting from a rotation of the pumping ring 46. An inflow hole 15 is formed in the upstream side of the axial flow of the sealed fluid resulting from the rotation of the pumping ring 46, so that the sealed fluid discharged from the discharge hole 14 returns to the inside of the sealed space from the inflow hole 15.

Abstract: A mechanical seal device for obtaining appropriate sliding properties under any conditions, such as a pressure of seal is low or high. Both first grooves 463 and second grooves 464 are formed on a sliding face 46 of a stationary ring 46. The first grooves which are not in communication externally and act for reducing contact resistance of a sliding face by a dynamic pressure action when a rotary shaft rotates, the second grooves act for reducing the contact resistance of the sliding face constantly by introducing a pressure from external. Thus, a mechanical seal device which is available to seal sealed fluid under an appropriate dry contact status wherein a sliding face load is reduced in any condition can be provided.

Abstract: The present invention provides a mechanical seal device for obtaining appropriate sliding properties under any conditions, such as a pressure of seal is low or high. In the present invention, both first grooves 463 and second grooves 464 are formed on a sliding face 46 of a stationary ring 46. The first grooves which are not in communication externally and act for reducing contact resistance of a sliding face by a dynamic pressure action when a rotary shaft rotates, the second grooves act for reducing the contact resistance of the sliding face constantly by introducing a pressure from external. Thus, a mechanical seal device which is available to seal sealed fluid under an appropriate dry contact status wherein a sliding face load is reduced in any condition can be provided.

Abstract: A mechanical seal device having a stationary sealing ring attached in close contact to a seal cover, a rotating sealing ring having a counter seal face in close contact with the seal face, and a fixing part having a first fixed ring holding the rotating sealing ring and a second fixed ring fitting in close contact with the rotary shaft and having a bellows surrounding the rotary shaft, having one end connected with the first fixed ring, and having another end connected with the second fixed ring, one seal face of the seal face and the counter seal face having fluid introduction ports for introducing the sealed fluid to the seal face at the circumferential surface at the sealed fluid side and the other seal face having dimples, or one seal face having the fluid introduction ports and the dimples, the dimples being arranged in lines radiating from a center of the seal face.