Tip seal and scroll fluid machine using same

A tip seal which is installed in a groove portion formed on a tooth tip of a spiral first wall and a spiral second wall of a scroll fluid machine and is formed of a resin, the scroll fluid machine comprising:

• a first scroll member having a first end plate on which the spiral first wall is provided;
• a second scroll member having a second end plate on which the spiral second wall is provided, the second end plate being disposed to face the first end plate and the spiral second wall meshing with the spiral first wall such that the second scroll member performs a revolution orbiting movement relative to the first scroll member, the tip seal comprising:
• a tip seal inclined portion which is installed in the groove portion of each of a wall inclined portion of the spiral first wall and a wall inclined portion of the spiral second wall whose heights are continuously changed in a spiral direction;
• and
• a tip seal flat portion which is installed in the groove portion of each of a wall flat portion of the spiral first wall and a wall flat portion of the spiral second wall whose heights are constant in the spiral direction and is adjacent to the tip seal inclined portion,
• wherein the tip seal inclined portion is inclined to the tip seal flat portion so as to come into contact with a tooth bottom of each of an end plate inclined portion of the first end plate and an end plate inclined portion of the second end plate even if a tip clearance between the tooth tip of each of the wall inclined portion of the spiral first wall and the wall inclined portion of the spiral second wall and the tooth bottom of each of the end plate inclined portion of the first end plate and the end plate inclined portion of the second end plate is changed during the revolution orbiting movement;
• and
• wherein a concave portion is formed on a surface of the tip seal at a position away from a connection position between the tip seal flat portion and the tip seal inclined portion by twice or more width of the tip seal flat portion, the concave portion being recessed from the surface of the tip seal.