Ohta, Motomu;

Refrigerant compressor

A refrigerant compressor for effecting successive compression and exhaust strokes by the reciprocating action of a piston driven by an inclined oscillating plate. A rotor chamber communicates with an air inlet chamber through an air inlet silencer chamber while an exhaust chamber communicates with an outlet via an exhaust silencer chamber. The exhaust silencer chamber communicates with a lower sump chamber through a separator so that lubricating oil can be separated in the exhaust chamber and can flow to the sump chamber wherefrom the lubricating oil can flow back to the rotor chamber through a bore in a rotor drive shaft which communicates with the sump chamber through an orifice.

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What is claimed is:

1. In a refrigerant compressor having a rotor chamber containing an oscillating plate driven by a rotor body secured to a rotatable shaft, the oscillating plate being coupled to a piston to produce reciprocation thereof in a cylinder to provide successive advance and retraction strokes, the compressor further having an inlet for fresh refrigerant gas to be compressed, an outlet for compressed refrigerant gas, an inlet for receiving refrigerant gas from the inlet for supply to the cylinder and an exhaust chamber for discharge of compressed refrigerant gas from the cylinder to said outlet, a sump containing lubricating fluid in the rotor chamber adapted for being stirred to effect lubrication in the rotor chamber, a passage being provided between the rotor chamber and the inlet chamber for return of compressed refrigerant gas which has leaked past the piston together with atomized lubricating fluid which becomes mixed with the compressed refrigerant gas, the improvement comprising an inlet silencer chamber between the inlet and the inlet chamber, an exhaust silencer chamber between the exhaust chamber and the outlet, means for separating lubricating fluid from compressed gas in said exhaust silencer chamber, a sump chamber communicating with the exhaust silencer chamber for receiving separated lubricating fluid with compressed refrigerant gas, and means for returning the separated lubricating fluid to the rotor chamber under the action of said compressed refrigerant gas.

2. The improvement as claimed in claim 1 comprising a separator between the exhaust silencer chamber and the sump chamber, said separator having an orifice for flow of separated lubricant fluid from the exhaust silencer chamber and the sump chamber.

3. The improvement as claimed in claim 2 wherein said exhaust silencer chamber is above the sump chamber.

4. The improvement as claimed in claim 3 wherein the means for separating lubricating fluid comprises orifice means for discharging exhaust gases with lubricating fluid from the exhaust chamber into the exhaust silencer chamber, the exhaust silencer chamber having a wall means facing said orifice means whereby the mixture of exhaust gases and lubricating fluid is propelled against said wall means and lubricating fluid flows downwardly by gravity towards the sump chamber, said outlet for compressed refrigerant gas being positioned above the exhaust silencer chamber for flow of exhaust gases therefrom.

5. The improvement as claimed in claim 4 wherein said means for returning the separated lubricating fluid to said rotor chamber comprises further orifice means for feeding the separated lubricating fluid from the sump chamber in the form of a jet, under the pressure of the exhaust gas, towards the rotor chamber.

6. The improvement as claimed in claim 5 wherein the rotatable shaft has a longitudinal bore communicating with the further orifice means for receiving the lubricating fluid, said shaft having outlet bores leading into said longitudinal bore for discharging the lubricating fluid.

7. The improvement as claimed in claim 4 wherein the compressor has a cylinder head with the exhaust and inlet chambers provided therein, and a cover on said cylinder head defining therewith the exhaust and inlet silencer chambers and the sump chamber.

8. The improvement as claimed in claim 7 wherein said cylinder head has a hole providing communication between the inlet silencer chamber and the inlet chamber.

9. The improvement as claimed in claim 8 wherein said orifice means is constituted by a plurality of orifices provided in the cylinder head between the exhaust chamber and the exhaust silencer chamber.

10. The improvement as claimed in claim 9 comprising separator means between the sump chamber and the inlet silencer chamber, said orifice means being disposed in said separator means and being connected to said sump chamber, said cylinder head having an expansion chamber communicating with the rotor chamber, said orifice means opening into said expansion chamber.