Sliding member

1. A mechanical seal device for suppressing leakage of a fluid to be sealed from between a housing and a rotating shaft penetrating the housing, the mechanical seal device comprising:

a housing;

a rotating shaft penetrating the housing;

a fluid to be sealed located between the housing and the rotating shaft;

a first sliding member having an annular shape and being mounted on one of the housing and the rotating shaft; and

a second sliding member having annular shape and being mounted on the other of the housing and the rotating shaft that the first sliding member is not mounted on;

wherein the first sliding member has a sliding surface that freely slidingly comes into contact with a sliding surface of the second sliding member after receiving an energizing force in an axial direction;

wherein on the sliding surface of the first sliding member there is a dynamic pressure generating groove that guides the fluid to be sealed from a side of a region to be sealed to a side of a region to not be sealed of the first sliding member sliding surface;

wherein the dynamic pressure generating groove also generates dynamic pressure resisting the energizing force by relative flow of the fluid to be sealed caused by rotation of the rotating shaft;

wherein on the sliding surface of the first sliding member there is a concave-convex section that is a separate groove arranged directly adjacent and spaced apart from the dynamic pressure generating groove such that deepest points in the concave-convex section groove are shallower than any deep point in the dynamic pressure generating groove, with the concave-convex section constituted of a plurality of minute grooves extending in a direction inclined with respect to a sliding direction of the first sliding member such that the fluid to be sealed is guided from the side of the region to be sealed to the side of the region to not be sealed of the first sliding member sliding surface; and

wherein the dynamic pressure generating groove and the concave-convex section each have an L-shaped groove shape in a plan view, wherein the dynamic pressure generating groove and the concave-convex section L-shaped groove shapes are radially reversed and arranged as a fitted oriented pair having matched directional properties therebetween.

2. The mechanical seal device according to claim 1 , wherein the dynamic pressure generating groove and the concave-convex section are formed close to each other.

3. The mechanical seal device according to claim 2 , wherein the concave-convex section is formed downstream of the dynamic pressure generating groove in a flow direction of the fluid to be sealed.

4. The mechanical seal device according to claim 1 ,

wherein

the dynamic pressure generating groove is a first dynamic pressure generating groove that generates the dynamic pressure for one rotation direction of the rotating shaft; and

the concave-convex section is a first concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the one rotation direction of the rotating shaft; and

the sliding surface of the first sliding member further comprises:

a second dynamic pressure generating groove that generates the dynamic pressure for another rotation direction of the rotating shaft; and

a second concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the another rotation direction of the rotating shaft.

5. The mechanical seal device according to claim 4 , wherein the first dynamic pressure generating groove, the first concave-convex section, the second concave-convex section, and the second dynamic pressure generating groove are arranged in this order from upstream to downstream in the flow direction of the fluid to be sealed for the one rotation direction of the rotating shaft.

6. The mechanical seal device according to claim 2 ,

wherein

the dynamic pressure generating groove is a first dynamic pressure generating groove that generates the dynamic pressure for one rotation direction of the rotating shaft; and

the concave-convex section is a first concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the one rotation direction of the rotating shaft; and

the sliding surface of the first sliding member further comprises:

a second dynamic pressure generating groove that generates the dynamic pressure for another rotation direction of the rotating shaft; and

a second concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the another rotation direction of the rotating shaft.

7. The mechanical seal device according to claim 3 ,

wherein

the dynamic pressure generating groove is a first dynamic pressure generating groove that generates the dynamic pressure for one rotation direction of the rotating shaft; and

the concave-convex section is a first concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the one rotation direction of the rotating shaft; and

the sliding surface of the first sliding member further comprises:

a second dynamic pressure generating groove that generates the dynamic pressure for another rotation direction of the rotating shaft; and

a second concave-convex section that guides the fluid to be sealed from the side of the region to be sealed of the first sliding member sliding surface to the side of the region to not be sealed thereof for the another rotation direction of the rotating shaft.