Semi-hermetic piston-type compressor

Abstract

The invention relates to a semi-hermetic piston-type compressor. The semi-hermetic piston-type compressor comprises a motor cavity, a motor, a crankcase, a crankshaft and a cylinder piston connecting rod component; the semi-hermetic piston-type compressor is characterized in that: a long shaft side of the crankshaft is provided with a pressure balanced hole and a pressure balanced pipe; the pressure balanced hole is a through hole which is formed from the end face of the long shaft side of the crankshaft along the axis direction of the long shaft side of the crankshaft inside the long shaft side of the crankshaft to the end face of a crank, which is arranged in the crankcase, of the crankshaft adjacent to the long shaft side of the crankshaft; one end of the pressure balanced pipe is communicated with the pressure balanced hole; the other end of the pressure balanced pipe is communicated with the motor cavity; an included angle between the axis of the pressure balanced pipe and the axis of the long shaft of the crankshaft is between 0 and 90 degrees; a lowest part of a clapboard between the motor cavity and the crankcase of the semi-hermetic piston-type compressor is provided witha one-way valve; an input port of the one-way valve is formed at one side of the motor cavity; and an output port of the one-way valve is formed at one side of the crankcase. The semi-hermetic piston-type compressor has the remarkable advantages that: a few parts are used to solve the problem of inner oil return of the compressor, and the semi-hermetic piston-type compressor has low manufacturingcost, high oil return efficiency, simple structure, simple machining and manufacturing, and safety and reliability.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a semi-hermetic piston compressor with an oil return device. Background technique [0002] When the semi-hermetic piston compressor is working, when the working fluid is discharged from the compressor, it is always discharged with a small amount of lubricating oil. The discharged lubricating oil must try to make it return to the crankcase of the compressor, otherwise it will cause insufficient lubricating oil in the compressor. Insufficient lubrication will cause the bearing surface to be worn or scratched, and in severe cases, it will cause the shaft to be stuck, the piston to be stuck in the cylinder, and the resulting connecting rod to bend and break. The existing technology of returning lubricating oil to the crankcase of semi-closed piston compressors is the oil return method of the air return pipe. The oil enters the motor cavity from the suction port of the compressor with the ...

AI Technical Summary

Problems solved by technology

Its disadvantage is: the efficiency of the internal oil return depends on the structural design of the compressor, and the oil return device of the compressor in the prior art has a complex structure and many parts, which increases the manufacturing cost of the compressor

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