Scroll Type Compressor

A scroll-type compressor comprising:

• a fixed scroll member whose movement in the rotational direction and the axial direction with respect to the inside of a housing is limited;
• a drive shaft which transmits a rotational force;
• an orbiting scroll member which is arranged to face the fixed scroll member in an opposed manner, and is connected to the drive shaft by way of an eccentric shaft which is eccentric with respect to the shaft center of the drive shaft so that the orbiting scroll member performs a orbiting movement about the shaft center of the drive shaft;
• a block member which is provided on a side of the orbiting scroll member opposite to a side to which the fixed scroll member faces in an opposed manner, and pivotally supports the drive shaft;
• and
• a rotation prevention member which is arranged between the orbiting scroll member and the block member, includes a plurality of key portions which are slidably engaged with a plurality of key groove portions formed on a back surface of the orbiting scroll member and a plurality of key portions which are slidably engaged with a plurality of key groove portions formed on an end surface of the block member which faces the orbiting scroll member in an opposed manner, and prevents the rotation of the orbiting scroll member by making the key portions engaged with the key groove portions corresponding to the key portions respectively,
• wherein a medium is compressed by moving a compression chamber formed by the fixed scroll member and the orbiting scroll member toward a center side while reducing a volume of the compression chamber due to the orbiting movement of the orbiting scroll member, and wherein
• an annular thrust race which receives the orbiting scroll member in the axial direction is sandwiched between the fixed scroll member and the block member,
• the thrust race is slidably brought into close contact with the whole circumference of an end surface of the orbiting scroll member which faces the thrust race in an opposed manner, and the thrust race is brought into close contact with the end surface of the block member to an area outside the key groove portions formed on the block member in the radial direction, and
• a retention space is defined by the orbiting scroll member, the thrust race and the block member, and the medium compressed in the compression chamber is supplied to and is retained in the retention space.