Patent ID: 11933306
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 13:
14. A scroll compressor comprising:
a container including an oil sump configured to collect oil;
a compression mechanism housed in the container, and configured to compress refrigerant that flows into the container;
a rotating shaft configured to drive the compression mechanism, and having an oil supply passage; and
an oil pump configured to be driven by rotation of the rotating shaft to supply the oil collected in the oil sump to the oil supply passage in the rotating shaft, wherein
the compression mechanism includes a fixed scroll and an orbiting scroll including an orbiting bedplate and an orbiting lap formed at the orbiting bedplate,
in the orbiting bedplate, an oil passage, a lap-side oil supply hole, and a thrust-surface-side oil supply hole are formed,
the oil passage is configured as a passage through which the oil supplied from the oil supply passage flows from inner part of the oil passage in a radial direction of the orbiting bedplate toward outer part of the oil passage in the radial direction,
the lap-side oil supply hole causes the oil passage to communicate with a lap-formation surface of the orbiting bedplate at which the orbiting lap is formed,
the thrust-surface-side oil supply hole causes the oil passage to communicate with a thrust surface of the orbiting bedplate that is opposite to the lap-formation surface of the orbiting bedplate,
in the oil passage, an opening and closing valve is provided, the opening and closing valve being configured to close the thrust-surface-side oil supply hole when a pressure of the oil in the oil passage is low, and open the thrust-surface-side oil supply hole when the pressure of the oil in the oil passage is high,
the opening and closing valve includes a valve body configured to slide in the oil passage to open or close the thrust-surface-side oil supply hole and an urging part configured to urge the valve body in a direction in which the thrust-surface-side oil supply hole is closed,
when a pressure of the oil that acts on the valve body in the oil passage exceeds a value of an urging force of the urging part, the valve body moves outward in the radial direction in the oil passage to open the thrust-surface-side oil supply hole,
the oil passage includes a first passage portion that is located in the inner part of the oil passage in the radial direction, and a second passage portion that is located in the outer part of the oil passage in the radial direction and outward of the first passage portion in the radial direction, the second passage portion having a larger diameter than the first passage portion,
the lap-side oil supply hole extends from the second passage portion to the lap-formation surface,
the thrust-surface-side oil supply hole extends from the second passage portion to the thrust surface,
the valve body includes a cylindrical portion configured to slide in the second passage portion and a circular plate portion that closes an opening of the cylindrical portion that is located on a first passage portion side, the circular plate portion having a through-hole in central part of the circular plate portion,
the cylindrical portion has a communication hole that communicates with the lap-side oil supply hole while the valve body is being pressed by the urging force of the urging part against a step formed by the first passage portion and the second passage portion, and
while the valve body is being pressed against the step, the first passage portion communicates with the lap-side oil supply hole via the through-hole, the second passage portion, and the communication hole, and the valve body closes the thrust-surface-side oil supply hole.