Electric compression and expansion apparatus and air conditioning system including the same

Abstract

The present disclosure provides an electric compression and expansion apparatus comprising a main housing comprising a motor chamber, a motor part housed in the motor chamber, a rotary shaft part extending in a length direction and coupled to the motor part, a compression part coupled to one side of the rotary shaft part in the length direction, and an expansion part coupled to another side of the rotary shaft part in the length direction. The rotary shaft part is configured to rotate integrally with the motor part, and the compression part is configured to rotate integrally with the rotary shaft part to compress refrigerant. The expansion part is configured to rotate integrally with the rotary shaft part to expand the compressed refrigerant.

What is claimed is: 
     
         1 . An electric compression and expansion apparatus comprising:
 a main housing comprising a motor chamber;   a motor part housed in the motor chamber;   a rotary shaft part extending in a length direction and coupled to the motor part, wherein the rotary shaft part is configured to rotate integrally with the motor part;   a compression part coupled to one side of the rotary shaft part in the length direction, wherein the compression part is configured to rotate integrally with the rotary shaft part to compress refrigerant; and   an expansion part coupled to another side of the rotary shaft part in the length direction, wherein the expansion part is configured to rotate integrally with the rotary shaft part to expand the compressed refrigerant.   
     
     
         2 . The electric compression and expansion apparatus of  claim 1 , wherein:
 the main housing comprises an intake port configured to introduce the refrigerant into the main housing, and
 a rear housing comprising an exhaust port located on one side of the compression part opposite to the main housing, the exhaust port being configured to discharge the compressed refrigerant. 
   
     
     
         3 . The electric compression and expansion apparatus of  claim 1 , wherein,
 the compression part comprises:   a first orbiting scroll coupled to the rotary shaft part and configured to rotate integrally with the rotary shaft part; and   a first fixed scroll located on one side of the first orbiting scroll opposite to the main housing, wherein the first fixed scroll is configured to be brought into contact with the first orbiting scroll with a predetermined space formed therein, and wherein the first fixed scroll is configured to compress the refrigerant,   the expansion part comprises:   a second orbiting scroll coupled to the rotary shaft part and configured to rotate integrally with the rotary shaft part; and   a second fixed scroll located on one side of the second orbiting scroll opposite to the main housing, wherein the second fixed scroll is configured to be brought into contact with the second orbiting scroll with a predetermined space formed therein, and wherein the second fixed scroll is configured to expand the compressed refrigerant, and   the second fixed scroll comprises an intake hole configured to introduce the compressed refrigerant into the predetermined space.   
     
     
         4 . The electric compression and expansion apparatus of  claim 1 , further comprising:
 a first main frame located between the main housing and the compression part, the first main frame being configured to couple the main housing to and in fluid communication with the compression part; and   a second main frame located between the main housing and the expansion part, the second main frame being configured to support another side of the rotary shaft part facing the expansion part.   
     
     
         5 . The electric compression and expansion apparatus of  claim 4 , wherein:
 the first main frame comprises a first bearing surrounding an outer circumference on one side of the rotary shaft part facing the compression part, the first bearing being configured to support the one side of the rotary shaft part,   the second main frame comprises a second bearing surrounding the outer circumference on the another side of the rotary shaft part facing the expansion part, the second bearing being configured to support the another side of the rotary shaft part, and   the first bearing has a smaller inner diameter than the second bearing.   
     
     
         6 . The electric compression and expansion apparatus of  claim 4 , wherein:
 a refrigerant communication flow path is formed through the rotary shaft part in the length direction,   one side of the refrigerant communication flow path facing the compression part is in communication with an inner space of the first main frame, and   another side of the refrigerant communication flow path facing the expansion part is in communication with an inner space of the second main frame.   
     
     
         7 . The electric compression and expansion apparatus of  claim 6 , wherein the first main frame comprises a first balance weight configured to rotate together with the rotary shaft part and the compression part, wherein one side of the first balance weight is coupled to one end of the rotary shaft part facing the compression part and another side of the first balance weight opposite to the one side is coupled to the compression part. 
     
     
         8 . The electric compression and expansion apparatus of  claim 7 , wherein:
 the first balance weight comprises:   a first body part comprising one side configured to be brought into contact with one end of the rotary shaft part;   a first eccentric part extending from the first body part; and   a first space part formed through the first body part, wherein a first fastening pin for coupling the first balance weight to the one end of the rotary shaft is configured to be inserted into the first space part, and   the one side of the first body part comprises a first communication hole recessed and configured to form a space to enable the inner space of the first main frame and the refrigerant communication flow path to communicate with each other.   
     
     
         9 . The electric compression and expansion apparatus of  claim 6 , wherein a second balance weight is located inside the second main frame, the second balance weight being configured to rotate together with the rotary shaft part and the expansion part, and wherein one side of the second balance weight is coupled to another end of the rotary shaft part facing the expansion part and the another side coupled to the expansion part and opposite to the one side. 
     
     
         10 . The electric compression and expansion apparatus of  claim 9 , wherein the refrigerant communication flow path comprises a check valve configured to restrict a flow of refrigerant inside the refrigerant communication flow path to a direction from the first main frame to the second main frame. 
     
     
         11 . The electric compression and expansion apparatus of  claim 10 , wherein:
 the second balance weight comprises:   a second body part having one side configured to be brought into contact with the another end of the rotary shaft part; and   a second eccentric part extending from the second body part, and   the one side of the second body part comprises a second communication hole recessed and configured to form a space to enable the inner space of the second main frame and the refrigerant communication flow path to communicate with each other.   
     
     
         12 . The electric compression and expansion apparatus of  claim 9 , wherein:
 the second balance weight comprises:   a second body part having one side configured to be brought into contact with the another end of the rotary shaft part;   a second protrusion part protruding a predetermined distance from the another side of the second body part opposite to the one side of the second body part; and   a second eccentric part extending from the second body part, and   the second protrusion part comprises:   a second space part recessed a predetermined distance from the one side of the second body part, wherein a second fastening pin for coupling the protrusion part to the other end of the rotary shaft part is configured to be inserted into the second space part; and   a closed surface located on one side of the second protrusion part opposite to the one side of the second body part, the closed surface being configured to close the second space part.   
     
     
         13 . The electric compression and expansion apparatus of  claim 12 , wherein:
 when the pressure in the first main frame is greater than or equal to the pressure in the second main frame, the second balance weight is configured to move a predetermined distance toward the expansion part such that the refrigerant communication flow path communicates with the inner space of the second main frame, and   when the pressure in the first main frame is smaller than the pressure in the second main frame, the second balance weight is configured to move a predetermined distance toward the main housing such that the communication between the refrigerant communication flow path and the inner space of the second main frame is blocked.   
     
     
         14 . An air conditioning system comprising:
 an electric compression and expansion apparatus configured to be driven by power and configured to compress or expand refrigerant;   a condenser coupled to and in fluid communication with the electric compression and expansion apparatus, the condenser being configured to condense refrigerant compressed in the electric compression and expansion apparatus; and   an evaporator coupled to and in fluid communication with the electric compression and expansion apparatus, the evaporator being configured to evaporate refrigerant expanded in the electric compression and expansion apparatus,   wherein the electric compression and expansion apparatus comprises:   a main housing comprising a motor chamber;   a motor part housed in the motor chamber;   a rotary shaft part extending in a length direction and coupled to the motor part, wherein the rotary shaft part is configured to rotate integrally with the motor part;   a compression part coupled to one side of the rotary shaft part in the length direction, wherein the compression part is configured to rotate integrally with the rotary shaft part to compress refrigerant; and   an expansion part coupled to another side of the rotary shaft part in the length direction, wherein the expansion part is configured to rotate integrally with the rotary shaft part to expand the compressed refrigerant.   
     
     
         15 . The air conditioning system of  claim 14 , wherein:
 the electric compression and expansion apparatus comprises:   a first main frame located between the main housing and the compression part, the first main frame being configured to couple the main housing to and in fluid communication with the compression part; and   a second main frame located between the main housing and the expansion part, the second main frame being configured to support the other side of the rotary shaft part facing the expansion part,   a refrigerant communication flow path is formed through the rotary shaft part in the length direction thereof,   one side of the refrigerant communication flow path facing the compression part is in communication with an inner space of the first main frame, and   another side of the refrigerant communication flow path facing the expansion part is in communication with an inner space of the second main frame.   
     
     
         16 . The electric compression and expansion apparatus of  claim 2 , wherein the intake port comprises a through-hole passing through an outer circumferential surface of the main housing. 
     
     
         17 . The electric compression and expansion apparatus of  claim 2 , further comprising a discharge chamber formed on one side of the rear housing, wherein the discharge chamber comprises a space through which the compressed refrigerant passes before being discharged through the exhaust port. 
     
     
         18 . The electric compression and expansion apparatus of  claim 3 , wherein the first fixed scroll comprises:
 a first fixed end plate part located adjacent to the rear housing;   a first fixed wrap coupled to the first orbiting scroll with a space formed therebetween;   a discharge port; and   a discharge valve configured to open or close the discharge port.   
     
     
         19 . An electric compression and expansion apparatus comprising:
 a main housing comprising a motor chamber, a first through-hole configured to introduce a refrigerant into the main housing;   a motor part housed in the motor chamber;   a rotary shaft part extending in a length direction and coupled to the motor part, wherein the rotary shaft part is configured to rotate integrally with the motor part;   a compression part coupled to one side of the rotary shaft part in the length direction, wherein the compression part is configured to rotate integrally with the rotary shaft part to compress the refrigerant; and   an expansion part coupled to another side of the rotary shaft part in the length direction, wherein the expansion part is configured to rotate integrally with the rotary shaft part to expand the compressed refrigerant; and   a rear housing comprising a second through-hole located on one side of the compression part opposite to the main housing, the second through-hole being configured to discharge the compressed refrigerant.   
     
     
         20 . The electric compression and expansion apparatus of  claim 19 , further comprising:
 a first main frame located between the main housing and the compression part, the first main frame being configured to couple the main housing to the compression part; and   a second main frame located between the main housing and the expansion part, the second main frame being configured to support another side of the rotary shaft part facing the expansion part.