Reciprocating compressor

Abstract

A reciprocating compressor according to the present invention includes a stator disposed in an inner space of a shell, and having a stator core with at least one air gap, and a coil fixed to the stator core, a piston mechanically connected with a magnet, and reciprocating by magnetic energy generated in the stator and interaction with the magnet, a cylinder having the piston inserted therein and forming a compression space, a suction valve opening/closing a suction side of the compression space, a discharge valve opening/closing a discharge side of the compression space, and an electromagnetic resonance spring formed between the stator and the magnet by a restoring force generated by the magnetic energy.

1 . A reciprocating compressor comprising:
 a shell having an inner space;   at least one stator disposed in the inner space of the shell, and provided with a stator core having at least one air gap, and a coil fixed to the stator core and generating magnetic energy in response to power applied;   a mover provided with a magnet and reciprocating with respect to the stator;   a piston mechanically connected with the mover, and reciprocating by the magnetic energy generated in the stator and interaction with the magnet;   a cylinder having the piston inserted therein and forming a compression space;   a suction valve opening and closing a suction side of the compression space;   a discharge valve opening and closing a discharge side of the compression space; and   an electromagnetic resonance spring formed between the stator core and the magnet by a restoring force generated by the magnetic energy.   
     
     
         2 . The reciprocating compressor of  claim 1 , wherein the electromagnetic resonance spring generates a difference of a magnetic level generated between the stator core and the magnet while the magnet moves according to a current supplied to the coil, such that the magnet resonates, in response to a force generated toward a side with a low magnetic level. 
     
     
         3 . The reciprocating compressor of  claim 2 , wherein the stator comprises an outer core disposed at an outer side and an inner core disposed at an inner side based on an air gap therebetween, and
 wherein the magnet is disposed to be movable between the outer core and the inner core.   
     
     
         4 . The reciprocating compressor of  claim 2 , wherein the stator comprises an outer core disposed at an outer side and an inner core disposed at an inner side based on an air gap therebetween, and
 wherein the magnet is coupled to the outer core or the inner core so as to be movable along with the coupled outer core or inner core.   
     
     
         5 . The reciprocating compressor of  claim 1 , wherein an electromagnetic center of the magnet is located more eccentric toward the compression space than an electromagnetic center of the stator. 
     
     
         6 . The reciprocating compressor of  claim 5 , wherein the magnet is configured such that N-pole and S-pole are arranged by at least one, respectively, along a reciprocating direction of the piston, and
 wherein the magnet is located such that a contact point between different poles is more eccentric toward the compression space than the electromagnetic center of the stator.   
     
     
         7 . The reciprocating compressor of  claim 1 , wherein the stator has air gaps at both sides of the coil, and
 wherein a center of the magnet is located more eccentric toward the compression space than a center of the coil.   
     
     
         8 . The reciprocating compressor of  claim 1 , wherein the stator has one air gap at one side of the coil and another side of the coil forms a magnetic path, and
 wherein a center of the magnet is located more eccentric toward the compression space than a center of a pole portion forming the air gap.   
     
     
         9 . The reciprocating compressor of  claim 1 , wherein a maximum stroke range of the piston is within a displacement at which the restoring force has an inflection point. 
     
     
         10 . The reciprocating compressor of  claim 1 , wherein the electromagnetic resonance spring is provided in plurality, the plurality of electromagnetic resonance springs being arranged along the reciprocating direction of the piston. 
     
     
         11 . The reciprocating compressor of  claim 1 , wherein magnets having the same pole are provided in a facing manner at one side surface of the piston in the reciprocating direction of the piston and a member corresponding to the piston, respectively. 
     
     
         12 . A reciprocating compressor comprising:
 a stator provided with a stator core having at least one air gap and a coil generating magnetic energy;   a mover provided with a magnet and reciprocating with respect to the stator;   a cylinder having an accommodation space therein; and   a piston coupled to the mover, forming a compression space along with the cylinder, and performing a resonant motion as the magnet receives a restoring force generated due to a difference of a magnetic level generated in the air gap of the stator core.   
     
     
         13 . The reciprocating compressor of  claim 12 , wherein a maximum stroke range of the piston is within a displacement at which the restoring force has an inflection point. 
     
     
         14 . A reciprocating compressor comprising a stator provided with a stator core having at least one air gap, and a coil generating magnetic energy along with the stator core, a mover provided with a magnet and reciprocating with respect to the stator, and a piston coupled to the mover, wherein the magnet generates a magnetic level along with the stator core and performs a resonant motion along with the piston by a restoring force generated toward a side with a low magnetic level,
 wherein a second position of the piston is located more eccentric toward the compression space than a first position of the piston, under assumption that a point where an electromagnetic center of the magnet and an electromagnetic center of the stator match each other is referred to as the first position and a position of the piston in an assembled or stopped state is referred to as the second position.   
     
     
         15 . The reciprocating compressor of  claim 14 , wherein a maximum stroke range of the piston is within a displacement at which the restoring force has an inflection point. 
     
     
         16 . The reciprocating compressor of  claim 14 , wherein the stator comprises an outer core disposed at an outer side and an inner core disposed at an inner side based on an air gap therebetween, and
 wherein the magnet is disposed to be movable between the outer core and the inner core.   
     
     
         17 . The reciprocating compressor of  claim 14 , wherein the stator comprises an outer core disposed at an outer side and an inner core disposed at an inner side based on an air gap therebetween, and
 wherein the magnet is coupled to the outer core or the inner core so as to be movable along with the coupled outer core or inner core.   
     
     
         18 . The reciprocating compressor of  claim 14 , wherein magnets having the same pole are provided in a facing manner at one side surface of the piston in the reciprocating direction of the piston and a member corresponding to the piston, respectively. 
     
     
         19 . The reciprocating compressor of  claim 12 , wherein magnets having the same pole are provided in a facing manner at one side surface of the piston in the reciprocating direction of the piston and a member corresponding to the piston, respectively.