Horizontal rotary compressor with oil forced by gas discharge into crankshaft bore

Claim 1

A horizontal rotary type compressor comprising: a closed shell; a rotary compression unit housed within said closed shell, said rotary compression unit having a cylinder, a cylinder head and a frame enclosing both ends of said cylinder, a piston eccentrically rotatable in said cylinder about an axis extending horizontally, a crankshaft fitted in said piston and having a central axial lubrication bore, and a vane dividing the space defined within said cylinder by said piston, cylinder head and frame into a suction and a compression chamber; said rotary compression unit further having a refrigerant discharge port; a refrigerant gas discharge pipe connected at one end to said refrigerant gas discharge port and having the other end below the surface level of lubricant oil accumulated in the bottom of said closed shell and having the downstream end closed; a lubricant oil-gas feed tube having one end opening into said closed downstream end and having the other end opening into said central lubrication bore in said crankshaft, a suction pipe extending downwards into the space where oil is accumulated in said closed shell and closely adjacent to the closed end of the closed downstream end of said refrigerant gas pipe and having the upper end obliquely cut and with the opening facing downstream in the refrigerant gas flow for generating a negative dynamic pressure due to refrigerant gas flow and facing said one end of said lubricant oil-gas feed pipe, whereby lubricant oil accumulated in the bottom of said closed shell is supplied to said lubrication bore in said crankshaft through said refrigerant gas discharge pipe.