| 主权项 |
1. A high pressure dome rotary compressor comprising:
a casing; a crank shaft extending in a vertical direction, the crank shaft having an eccentric part, and the casing having a bottom at a lower end of the crank shaft; and a rotary compression mechanism disposed in the casing, the rotary compression mechanism having a piston attached to the crank shaft and arranged to revolve in a cylinder along an inner peripheral surface of the cylinder when the crank shaft having the eccentric part is rotated to compress and discharge gas in a cylinder chamber defined by the piston and cylinder in a least one compression process and at least one discharge process that occur during a plurality of operation cycles during operation of the rotary compressor, the rotary compression mechanism further defining a discharge port and including a discharge valve, and a single cycle of the operation of the plurality of operation cycles of the rotary compressor occurs with a first 360° rotation of the crank shaft such that a compression process of the at least one compression process and a discharge process of the at least one discharge process occur within the first 360° rotation of the crank shaft, the discharge valve being opened in the first 360° rotation of the crank shaft in the discharge process and closed in the first 360° rotation of the crank shaft during a period of time from when the discharge process is finished to when a next compression process is started in a subsequent second 360° rotation of the crank shaft, the rotary compressor being arranged and configured such that high pressure gas discharged from the discharge port in the at least one discharge process is discharged outside the casing through an opening in the casing, and an oil feed path formed within the casing, the crank shaft and the discharge port being shaped and located to, in combination, define the oil feed path configured to route lubricant oil contained in an oil sump at the bottom of the casing to an inside of the discharge port, the discharge valve having an inlet side and an outlet side, with refrigerant flowing from the compression chamber on the inlet side to the outlet side when the discharge valve is open, the discharge port being on the inlet side, and the oil feed path being disposed on the inlet side of the discharge valve, wherein the oil feed path is at least one of
open to the inside of the discharge port when the discharge valve is open so that the discharge port receives the lubricant oil routed in the oil feed path as the crank shaft rotates through a first rotational angle range of the first 360° rotation of the crank shaft, the first rotational angle range being in a period of time from the point in time in the discharge process to when the discharge process is finished, andopen to the inside of the discharge port when the discharge valve is closed so that the discharge port receives the lubricant oil routed in the oil feed path as the crank shaft rotates through a second rotational angle range from an end of the first rotational angle range in the first 360° rotation of the crank shaft to a point in the second 360° rotation of the crank shaft, the second rotational angle range being in a period of time from when the discharge process is finished to when the compression process is started, and wherein the oil feed path is closed to the inside of the discharge port when the discharge valve is closed so that the discharge port does not receive the lubricant oil routed in the oil feed path as the crank shaft rotates through a third rotational angle range of the second 360° rotation of the crank shaft, the third rotational angle range being in a period of time from when the compression process is started. |
