Reciprocating compressor
AssigneeLG Electronics Inc.
InventorsYounghwan Kim, Jinkook Kim, Jongmok Lee
Life of this patent
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Abstract
A reciprocating compressor including a crankshaft including a shaft portion, an eccentric mass portion, and a pin portion, and an oil groove positioned on an outer surface of the pin portion configured to supply oil to a pressurized portion of a bearing immediately before entering a section in which a gas load increases. For example, the oil groove may supply the oil to the bearing in a stroke section immediately before a crank angle reaches 270°. Accordingly, lubrication by the oil may be smoothly performed in the stroke section subjected to a high load, and oil shortage may be improved even if the oil groove adopts a structure in which the bearing is open at the top and bottom.
Claims18
A reciprocating compressor, comprising:
- a sealed container with a sealed space;
- an electric drive unit installed in the sealed container and configured to generate a rotational force;
- and
- a compression unit installed on an upper side of the electric drive unit and configured to receive the rotational force of the electric drive unit and compress a refrigerant, wherein the compression unit includes:
- a crankshaft including a shaft portion that is coupled to a rotor and is inserted into a cylinder block, an eccentric mass portion that is eccentrically formed in a fan shape or an eccentric circular flange shape at an upper end of the shaft portion to form a plate-shaped extension, and a pin portion which is formed eccentrically with respect to the shaft portion at an upper surface of the eccentric mass portion and eccentrically rotates around the shaft portion;
- a connecting rod rotatably coupled to the pin portion and configured to convert a rotational motion into a linear motion;
- and
- a piston rotatably coupled to the connecting rod and configured to compress the refrigerant while linearly reciprocating in a cylinder, wherein the crankshaft further includes a first oil hole passing through the shaft portion and the pin portion, a second oil hole that is connected to the first oil hole and formed toward an outer surface of the pin portion, and an oil groove that is formed on the outer surface of the pin portion and connected to the second oil hole, wherein the oil groove supplies oil to a pressurized portion of a bearing formed by the pin portion and the connecting rod immediately before entering a section in which a gas load increases, wherein the pin portion eccentrically rotates clockwise around the shaft portion while sequentially going through a first section in which the pin portion rotates clockwise until a crank angle, at which the piston is positioned at top dead center, reaches from 0° to 90°, a second section in which the pin portion rotates clockwise until the crank angle reaches from 90° to 180°, a third section in which the pin portion rotates clockwise until the crank angle reaches from 180° to 270°, and a fourth section in which the pin portion rotates clockwise until the crank angle reaches from 270° to 0°, and wherein the section in which the gas load increases is the fourth section.
Dependencies are inferred from the claim text.