Scroll compressor with reduced upsetting moment

A scroll compressor comprising:

• a casing;
• a compression mechanism contained in the casing, the compression mechanism including
• a fixed scroll having an end plate portion, an outer peripheral portion formed on an outer periphery of the end plate portion, and a fixed wrap placed upright at a location radially inside of the outer peripheral portion, and
• an orbiting scroll having an end plate portion slidably contacting with the outer peripheral portion of the fixed scroll and a front end portion of the fixed wrap of the fixed scroll, and an orbiting wrap placed upright on the end plate portion;
• a pressing mechanism arranged to apply a pressing force toward the fixed scroll to a back side of the end plate portion of the orbiting scroll;
• a pushback mechanism arranged to apply a pushback force separating the orbiting scroll from the fixed scroll to a front of the end plate portion of the orbiting scroll;
• and
• at least one adjusting mechanism having
• a low-pressure portion filled with a fluid of lower pressure than a discharge pressure of the compression mechanism, and
• a communicating groove formed in a sliding surface of the outer peripheral portion of the fixed scroll so as
• to communicate with the low-pressure portion in a first rotational angle range in order to reduce an upsetting moment of the orbiting scroll, and
• to be blocked from the tow-pressure portion in a second rotational angle range other than the first rotational angle range
• the pushback mechanism including a high-pressure side oil groove which is formed in the sliding surface of the outer peripheral portion of the fixed scroll, and
• the communicating groove being formed on the outside in a radial direction of the high-pressure side oil groove;
• the adjusting mechanism including a concave recess formed in a sliding surface of the end plate portion of the orbiting scroll and a suction port as the low-pressure portion in order to suck the fluid into the compression mechanism, and
• the adjusting mechanism being configured such that
• when the orbiting scroll comes into the first rotational angle range, an inside of the concave recess is in a position at which the concave recess communicates with both of the suction port and the communicating groove, and
• when the orbiting scroll comes into the second rotational angle range, the inside of the communicating concave recess is in a position blocked from at least one of the suction port and the communicating groove.