Reciprocating compressor

摘要

A reciprocating compressor is provided that reciprocates a piston inside a cylinder as a linear motor is driven, to compress a refrigerant by sucking the refrigerant into a compression space between the cylinder and the piston, and then discharge the same. The piston is operated at a top dead center position and in a resonance state by symmetrically applying a voltage even if a load varies. An elastic coefficient of mechanical spring is set in consideration of a degree of shift of the piston influenced by gas springs varied by the load, and an initial value of the piston to maintain stroke of the piston is set so as to correspond to a required cooling capacity condition.

主权项

1. A reciprocating compressor, comprising:
a closed vessel; a cylinder installed inside the closed vessel; a linear motor that linearly reciprocates a piston; a controller that applies a symmetrical voltage to the linear motor; a gas spring that elastically supports the piston in a motion direction by a refrigerant gas filled inside the closed vessel; and a mechanical spring that elastically supports the piston in the mourn direction, the mechanical spring having an elastic coefficient that allows the piston to perform both a top dead center operation and a resonance operation even if a load condition varies, wherein the elastic coefficient of the mechanical spring and an initial position of the piston are set in accordance with a maximum load condition, and wherein a stroke length of the piston required to provide a maximum flow rate is two times larger than a distance of the initial position of the piston from a center point and is equal to or smaller than a sum of two times the distance of the initial position of the piston from the center point and a distance that the piston is shifted due to a flow rate of a refrigerant, and therefore the stroke of the piston is maximum under the maximum load condition.