Rotary closed type compressor and refrigerating cycle apparatus

A rotary closed type compressor in which an electric motor unit and a rotary compression mechanism unit coupled to the electric motor unit are housed in a closed case and the closed case is caused to be in a high-pressure state by tentatively discharging gas compressed by the compression mechanism unit into the closed case, wherein the electric motor unit is received in an upper portion of the closed case, and the rotary compression mechanism unit is received in a lower portion of the closed case;

• and
• the compression mechanism unit comprises:
• a first cylinder and a second cylinder having cylinder chambers, respectively, an eccentric roller being housed in the cylinder chamber while being eccentrically rotatable;
• vanes which are provided in the first cylinder and the second cylinder, respectively, each of the vanes being pressed and biased such that a leading edge of said each of the vanes comes into contact with a circumferential surface of the eccentric roller, said each of the vanes dividing a corresponding one of the cylinder chambers into two sections along a rotating direction of the eccentric roller;
• vane chambers in which back-face side end portions of the vanes are housed, respectively;
• a spring member provided in the vane chamber on a first cylinder side which urges the vane provided in the first cylinder toward the eccentric roller;
• and
• a pressure switch mechanism which introduces suction pressure or discharge pressure to the cylinder chamber of the second cylinder;
• a vane chamber on a second cylinder side opens to an interior of the closed case to permit high pressure in the closed case to be directly introduced into the vane chamber on the second cylinder side;
• wherein the vane provided in the first cylinder is pressed and biased by a spring member provided in the vane chamber on the first cylinder side;
• the vane provided in the second cylinder is pressed and biased according to a pressure difference between a case internal pressure introduced to the vane chamber on the second cylinder side and suction pressure introduced to the cylinder chamber of the second cylinder when the pressure switch mechanism introduces the suction pressure to the cylinder chamber of the second cylinder;
• the leading edge of the vane of the second cylinder is urged to be brought into contact with a peripheral surface of the eccentric roller only by a difference between the case internal pressure introduced to the vane chamber on the second cylinder side and the suction pressure introduced to the cylinder chamber of the second cylinder, when the pressure switch mechanism introduces the suction pressure to the cylinder chamber of the second cylinder;
• and
• the case internal pressure introduced to the vane chamber on the second cylinder side is balanced with the discharge pressure introduced to the cylinder chamber of the second cylinder to thereby balance pressure at the leading edge and a rear edge of the vane of the second cylinder, thereby separating the leading edge of the vane of the second cylinder from the circumferential surface of the eccentric roller when the pressure switch mechanism introduces the discharge pressure to the cylinder chamber of the second cylinder.