Two step compressor unit and compressor system having the same

Abstract

A compressor unit having a triple trochoidal rotor, which includes a first rotor, a second rotor, a third rotor, a casing, second and first suction ports, and second and first discharge ports; and a driving unit that rotates the three rotors such that external working fluid is sucked into the suction port and the working fluid sucked into the suction port is discharged to the discharge port in a state of being compressed.

What is claimed is: 
     
         1 . A two-stage compressor unit comprising:
 a first rotor having a plurality of outwardly extending trochoidal gear teeth formed on an outer peripheral surface thereof and a stationary shaft securely fixed to a rotary center thereof;   a second rotor configured to eccentrically accommodate the first rotor therein, the second rotor having a plurality of inwardly extending trochoidal gear teeth formed on an inner peripheral surface thereof in such a manner that the inwardly extending trochoidal gear teeth of the second rotor are in line contact with the outwardly extending trochoidal gear teeth of the first rotor while being engaged with the trochoidal gear teeth of the first rotor, and a plurality of outwardly extending trochoidal gear teeth formed on an outer peripheral surface thereof, wherein a number of the inwardly extending trochoidal gear teeth of the second rotor is larger than that of the outwardly extending trochoidal gear teeth of the first rotor and a number of the outwardly extending trochoidal gear teeth of the second rotor is equal to that of the inwardly extending trochoidal gear teeth of the second rotor;   a third rotor configured to eccentrically accommodate the second rotor therein, and having a plurality of inwardly extending trochoidal gear teeth formed on an inner peripheral surface thereof in such a manner that the inwardly extending trochoidal gear teeth of the third rotor are in line contact with the outwardly extending trochoidal gear teeth of the second rotor while being engaged with the outwardly extending trochoidal gear teeth of the second rotor, where a number of the inwardly extending trochoidal gear teeth of the third rotor is larger than that of the outwardly extending trochoidal gear teeth of the second rotor;   a casing configured to sealingly accommodate the first, second and third rotors in such a manner as to be disposed independently of the stationary shaft of the first rotor, and rotatably support the driving shaft of the third rotor in a state in which the driving shaft extends protrudingly to the outside;   a second suction port disposed at a side of the driving shaft so as to fluidically connect an inside and an outside of the casing, and position at a portion in which the space between the outwardly extending trochoidal gear teeth of the first rotor and the inwardly extending trochoidal gear teeth of the second rotor are widened maximally when the first, second and third rotors are rotated, and a first suction port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the second rotor and the inwardly extending trochoidal gear teeth of the third rotor is widened maximally; and   a second discharge port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the first rotor and the inwardly extending trochoidal gear teeth of the second rotor are narrowed when the first, second and third rotors are rotated, and a first discharge port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the second rotor and the inwardly extending trochoidal gear teeth of the third rotor is narrowed.   
     
     
         2 . The two-stage compressor unit according to  claim 1 , further comprising:
 a suction resistance preventing slot formed in a compressor cover that fixes a central rotary shaft of the first rotor to an external cover upon the rotation of the first, second and the third rotors, in such a manner as to extend from the first and second suction ports;   a residue compressed gas rotation resistance preventing slot formed in the compressor cover in such a manner as to extend from the first and second discharge ports; and   a compression ratio adjustment slot formed in the compressor cover in such a manner as to extend from the first and second discharge ports.   
     
     
         3 . A compressor system comprising:
 a two-stage compressor unit including a triple trochoidal rotor, the compressor unit comprising:
 a first rotor having a plurality of outwardly extending trochoidal gear teeth formed on an outer peripheral surface thereof and a stationary shaft securely fixed to a rotary center thereof; 
 a second rotor configured to eccentrically accommodate the first rotor therein, the second rotor having a plurality of inwardly extending trochoidal gear teeth formed on an inner peripheral surface thereof in such a manner that the inwardly extending trochoidal gear teeth of the second rotor are in line contact with the outwardly extending trochoidal gear teeth of the first rotor while being engaged with the trochoidal gear teeth of the first rotor, and a plurality of outwardly extending trochoidal gear teeth formed on an outer peripheral surface thereof, wherein a number of the inwardly extending trochoidal gear teeth of the second rotor is larger than that of the outwardly extending trochoidal gear teeth of the first rotor and a number of the outwardly extending trochoidal gear teeth of the second rotor is equal to that of the inwardly extending trochoidal gear teeth of the second rotor; 
 a third rotor configured to eccentrically accommodate the second rotor therein, and having a plurality of inwardly extending trochoidal gear teeth formed on an inner peripheral surface thereof in such a manner that the inwardly extending trochoidal gear teeth of the third rotor are in line contact with the outwardly extending trochoidal gear teeth of the second rotor while being engaged with the outwardly extending trochoidal gear teeth of the second rotor, where a number of the inwardly extending trochoidal gear teeth of the third rotor is larger than that of the outwardly extending trochoidal gear teeth of the second rotor; 
 a casing configured to sealingly accommodate the first, second and third rotors in such a manner as to be disposed independently of the stationary shaft of the first rotor, and rotatably support the driving shaft of the third rotor in a state in which the driving shaft extends protrudingly to the outside; 
 a second suction port disposed at a side of the driving shaft so as to fluidically connect an inside and an outside of the casing, and position at a portion in which the space between the outwardly extending trochoidal gear teeth of the first rotor and the inwardly extending trochoidal gear teeth of the second rotor are widened maximally when the first, second and third rotors are rotated, and a first suction port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the second rotor and the inwardly extending trochoidal gear teeth of the third rotor is widened maximally; and 
 a second discharge port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the first rotor and the inwardly extending trochoidal gear teeth of the second rotor are narrowed when the first, second and third rotors are rotated, and a first discharge port positioned at a portion in which the space between the outwardly extending trochoidal gear teeth of the second rotor and the inwardly extending trochoidal gear teeth of the third rotor is narrowed; and 
   a driving unit connected to the driving shaft, and configured to apply a torque to the driving shaft to rotate the first, second and third rotors such that external working fluid is sucked into the suction port and the working fluid sucked into the suction port is discharged to the discharge port in a state of being compressed.   
     
     
         4 . The compressor system according to  claim 3 , wherein first discharge port and the second suction port are fluidically connected to the connection pipe or the inside of the compressor front cover such that the working fluid primarily compressed between the second rotor and the third rotor after being sucked into the first suction port and then primarily discharged through the first discharge port is induced to the second suction port to cause the working fluid to be secondarily compressed between the first rotor and the second rotor, and the primarily discharged fluid is cooled and then is sucked into the second suction port to lower the temperature of the fluid discharged to the second discharge port. 
     
     
         5 . The compressor system according to  claim 1 , wherein the compressor unit further comprises:
 a suction resistance preventing slot formed in a compressor cover that fixes a central rotary shaft of the first rotor to an external cover upon the rotation of the first, second and the third rotors, in such a manner as to extend from the first and second suction ports;   a residue compressed gas rotation resistance preventing slot formed in the compressor cover in such a manner as to extend from the first and second discharge ports; and   a compression ratio adjustment slot formed in the compressor cover in such a manner as to extend from the first and second discharge ports.   
     
     
         6 . The two-stage compressor unit according to  claim 1 , wherein the two-stage compressor unit including a triple trochoidal rotor is applied to any one of two-stage expanding turbines, two-stage fluid pumps, vacuum pumps, companders (combined compressors and expanders), and expanding turbine pumps (external expanding turbine and internal pumps), besides industrial compressors. 
     
     
         7 . The compressor system according to  claim 3 , further comprising a lubrication system wherein an oil chamber and an oil feeding path are arranged at inner side of the front cover of the compressor to supply the oil to an oil feeding path of the third rotor, and
 wherein an oil chamber is arranged at parts where the first, second and third rotors contact to supply the oil to the first, second and third rotors and bearings of central stationary shaft, and   wherein an oil circulation groove is formed in each rotor to lubricate contact surface of the front cover of the compressor and each rotor.   
     
     
         8 . The compressor system according to  claim 3 , further comprising a lubrication system wherein oil is supplied through an oil passageway formed inside the driving shaft and oil is supplied to a bearing installed on the driving shaft through an oil passageway leading to the bearing inside the driving shaft, and
 wherein by supplying oil through an oil passageway formed inside the driving shaft, the oil is supplied to the bearings disposed on the driving shaft and the stationary shaft passing through the center of the first rotor of the rotor assembly and installed in the front outer cover of the compressor.   
     
     
         9 . The compressor system according to  claim 3 , wherein the two-stage compressor unit including a triple trochoidal rotor is applied to any one of two-stage expanding turbines, two-stage fluid pumps, vacuum pumps, companders (combined compressors and expanders), and expanding turbine pumps (external expanding turbine and internal pumps), besides industrial compressors.