Linear compressor

Abstract

The present invention discloses a linear compressor including: a hermetic container which defines a sealed space where a refrigerant flows in and out and which has an inlet pipe and an outlet pipe; a cylinder provided in the hermetic container and having a compression space therein; a piston linearly reciprocated in the cylinder and compressing the refrigerant of the compression space; a linear motor supplying a driving force to the piston and operating the piston at a set operating frequency; a plurality of support springs elastically supporting an assembly composed of the cylinder, the piston and the linear motor on the bottom surface of the hermetic container; and a loop pipe provided to guide the refrigerant compressed in the compression space to the outlet pipe. As the exciting force exerted on the hermetic container by the loop pipe has an opposite phase to the exciting force exerted on the hermetic container by the support springs, vibration of the assembly can be offset by vibration of the loop pipe through the phase shift, and thus the overall vibration can be reduced.

Description

TECHNICAL FIELD [0001]The present invention relates to a linear compressor which can reduce vibration through the phase shift between vibration factors.BACKGROUND ART [0002]In general, a compressor is a mechanical apparatus for receiving power from a power generation apparatus, such as an electric motor, a turbine, etc. and compressing the air, refrigerant or other various operating gases to raise the pressure. The compressor has been widely used in electric home appliances such as refrigerators, air conditioners, etc., and its application has been expanded to the whole industry.[0003]The compressors are roughly classified into a reciprocating compressor in which a compression space for sucking and discharging an operating gas is defined between a piston and a cylinder so that the piston can be linearly reciprocated in the cylinder to compress a refrigerant, a rotary compressor in which a compression space for sucking and discharging an operating gas is defined between an eccentrica...

AI Technical Summary

Benefits of technology

[0017]As described above, in the linear compressor according to the present invention, the main body is elastically supported in the hermetic container by the support springs and the loop pipe, and the natural frequency of the loop pipe is set lower than the rated operating frequency. Since the linear compressor operates at the rated operating frequency directly upon starting by using the inverter motor, the exciting force of the loop pipe moves in the opposite direction to the exciting force of the support springs at the rated operating frequency, thereby reducing vibration transferred to the entire compressor.

Problems solved by technology

However, since the linear compressor operates in a resonance state to improve compression efficiency, reducing the mass of the mechanism unit to reduce vibration may unsuitably degrade the overall efficiency of the compressor.

Specifically, if the natural frequency of the loop pipe is lower than the operating frequency of the linear compressor, while the operating frequency of the linear compressor is raised to the rated operating frequency upon starting, resonance occurs when the operating frequency of the linear compressor becomes equal to the natural frequency of the loop pipe, which may lead to damage of the loop pipe.

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