Reciprocating compressor

Abstract

Provided is a reciprocating compressor. The reciprocating compressor includes a cylinder having a compression space, a piston inserted into the cylinder to define the compression space while being reciprocated, the piston having a suction passage to communicate with the compression space, a gas bearing having a bearing hole passing through the cylinder so that a refrigerant gas is injected between the cylinder and the piston to support the piston with respect to the cylinder, and a flow resistance part disposed on an outer circumferential surface of the cylinder or one side of the cylinder to restrict a flow of the refrigerant gas flowing toward the bearing hole.

Description

technical field [0001] The present invention relates to reciprocating compressors, in particular to reciprocating compressors having gas bearings. Background technique [0002] In general, a reciprocating compressor uses a method in which a piston reciprocates linearly inside a cylinder to suck in compressed refrigerant and discharge it. Reciprocating compressors can be divided into connection type and vibration type according to the driving method of the piston. [0003] The connected reciprocating compressor adopts a method in which a piston is connected to a rotating shaft of a rotary electric machine via a connecting rod to reciprocate in a cylinder to compress refrigerant. In contrast, the vibrating reciprocating compressor uses a method in which a piston is connected to a mover (mover) of a reciprocating motor to vibrate, thereby reciprocating in a cylinder to compress refrigerant. The present invention relates to a vibratory reciprocating compressor, so the vibrator...

AI Technical Summary

Problems solved by technology

[0007] However, in the conventional reciprocating compressor as described above, the gas refrigerant cannot be supplied between the cylinder 2 and the piston 1 because the foreign matter mixed in the gas refrigerant flows into the gas bearing and clogs the gas bearing. The concentricity between 1 and cylinder 2 deviates and piston 1 reciprocates in a state of close contact with cylinder 2, resulting in frictional loss or wear

In particular, if the oil remaining in the refrigeration cycle is mixed with the refrigerant and flows into the gas bearing of the compressor, the gas bearing will be firmly blocked by foreign matter due to the viscosity of the oil, resulting in a decrease in the performance of the bearing.

In addition, when the oil flows between the cylinder 2 and the piston 1, foreign matter mixed in the oil sticks between the cylinder 2 and the piston 1, causing frictional loss or wear

[0008] In view of these problems, it is possible to prevent clogging by foreign matter by forming the bearing hole of the gas bearing larger. However, at this time, the compressed gas refrigerant does not flow into the refrigeration cycle and the amount of refrigerant flowing into the gas bearing increases, thereby resulting in a corresponding increase in compression loss

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