Sliding component

A shaft sealing device comprising a pair of sliding components formed in an annular shape and disposed at a relative rotation point of a rotating machine, one of the sliding components having a sliding surface provided with a plurality of first positive pressure generation grooves arranged side by side in a circumferential direction, the plurality of first positive pressure generation grooves being configured for generating positive pressure by a sealing target fluid on a sealing target fluid side which is introduced during the relative rotation of the sliding component, the first positive pressure generation grooves having a plurality of leading edge portions at leading edges on a downstream side in a direction of the relative rotation, the plurality of leading edge portions being arranged side by side in the circumferential direction, at least part of the plurality of leading edge portions being disposed so as to be different from each other in radially directional position,

• each of the first positive pressure generation grooves extend at an angle to the downstream side in the direction of the relative rotation while extending from the sealing target fluid side toward a leakage side,
• inclined angles of the first positive pressure generation grooves which are adjacent to each other in the circumferential direction are different from each other with respect to the radial direction, the plurality of leading edge portions arranged side by side have radial positions gradually changing along the circumferential direction on the sliding surface of the one of the sliding components, the first positive pressure generation grooves have opening portions which are opened to the sealing target fluid side,
• respectively, a plurality of sealing target fluid side land portions each is formed between adjoining two of the opening portions of the first positive pressure generation grooves, an annular leak side land portion is formed on the leak side as compared with the leading edges of the first positive pressure generation grooves, and the plurality of sealing target fluid side land portions and the annular leak side land portion are equal to each other in height of land.

A shaft sealing device comprising a pair of sliding components formed in an annular shape and disposed at a relative rotation point of a rotating machine, one of the sliding components having a sliding surface provided with a plurality of first positive pressure generation grooves arranged side by side in a circumferential direction,

• the plurality of first positive pressure generation grooves being configured for generating positive pressure by a sealing target fluid on a sealing target fluid side which is introduced during the relative rotation of the sliding component,
• the first positive pressure generation grooves having a plurality of first leading edge portions at leading edges on a downstream side in a direction of the relative rotation,
• the plurality of first leading edge portions being arranged side by side in the circumferential direction,
• at least part of the plurality of first leading edge portions being disposed at different radial positions,
• wherein the sliding surface is further provided with a plurality of second positive pressure generation grooves which are arranged side by side in a circumferential direction, which are independent of the first positive pressure generation grooves on a leak side as compared with the first positive pressure generation grooves and which generate positive pressure by a fluid on the leak side as compared with the first positive pressure generation grooves, the fluid being introduced during the relative rotation of the rotating machine,
• each of the second positive pressure generation grooves is provided with a second leading edge portion at a leading edge on the downstream side in the relative rotation direction, and
• the second leading edge portions are arranged side by side in the circumferential direction and disposed at different radial positions at least in part.