Encapsulated refrigeration compressor

Abstract

The invention provides a sealed type cold compressor which is provided with a sealed shell, an electric motor and a gas compression device are arranged in the sealed shell; the gas compression device comprises a cylinder block, a crank shaft, a cylinder, a piston and accessories, the middle part of the cylinder block is provided with a crank shaft mounting hole, one end of the crank shaft is provided with an eccentric shaft which is connected with the piston arranged in the cylinder by a piston connecting bar, and the crank shaft is provided with a lubricant supply passage; the compressor is characterized in that: the crank shaft mounting hole is internally sheathed with a double row ball bearing subassembly, the crank shaft passes through the axle hole of the double row ball bearing subassembly, and the rotor of the electric motor is sheathed in the inner ring over-long section of the crank shaft or the double row ball bearing subassembly. The double row ball bearing subassembly adopted by the invention can bear the axial load and radial load simultaneously to cause a main bearing on the crank shaft to move in a rolling friction way in the axial direction and the radial direction, thus greatly reducing the mechanical friction loss of the main bearing to improve the compressor performance; the sealed type cold compressor has the advantages of simple structure and convenient assembly, etc.

Description

technical field [0001] The invention relates to a refrigeration compressor, in particular to a compressor used in household and small refrigeration systems. Background technique [0002] The existing hermetic refrigeration compressor is installed in a closed shell, the motor and the cylinder are installed on a cylinder block, and the crankshaft with eccentric shaft that pushes the connecting rod-piston to reciprocate is assembled on the crankshaft hole of the cylinder block, and the crankshaft And the weight of the motor rotor installed on it is supported by the crankshaft hole upper end surface of the cylinder block. [0003] When the compressor is working, the motor drives the crankshaft to rotate, so that the force generated by the piston intermittently compressing the gas is transmitted to the eccentric shaft of the crankshaft and the main bearing of the crankshaft and the cylinder block through the connecting rod. [0004] Since the upper end surface of the crankshaft ...

AI Technical Summary

Problems solved by technology

[0008] In the prior art, in order to reduce the friction loss of the main bearing, the diameter of the main bearing and the length of the friction pair can be reduced as much as possible, but due to the requirements of strength and minimum oil supply, it cannot be reduced without limit

[0009] In order to reduce friction loss, the structure of thrust ball bearings has been adopted in the crankshaft support of the hermetic compressor (such as the crankshaft piston refrigerator compressor with patent No. 02260924.5), which can reduce axial friction loss, but the main function of the crankshaft The bearing is still frictional and sliding, and the loss is relatively large

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