WO2013058595A1 - 공기조화기 - Google Patents

공기조화기 Download PDF

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Publication number
WO2013058595A1
WO2013058595A1 PCT/KR2012/008589 KR2012008589W WO2013058595A1 WO 2013058595 A1 WO2013058595 A1 WO 2013058595A1 KR 2012008589 W KR2012008589 W KR 2012008589W WO 2013058595 A1 WO2013058595 A1 WO 2013058595A1
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WO
WIPO (PCT)
Prior art keywords
oil
refrigerant
compressor
case
compressors
Prior art date
Application number
PCT/KR2012/008589
Other languages
English (en)
French (fr)
Korean (ko)
Inventor
윤필현
사용철
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to EP12841464.6A priority Critical patent/EP2778569B1/de
Priority to US14/353,106 priority patent/US20140326008A1/en
Publication of WO2013058595A1 publication Critical patent/WO2013058595A1/ko

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03—Oil level

Definitions

  • the present invention relates to an air conditioner, and more particularly, to an air conditioner for separating and efficiently recovering oil mixed in a refrigerant compressed in a plurality of compressors.
  • an air conditioner is a device for cooling or heating a room using a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger. That is, it may be configured as a cooler for cooling the room, a heater for heating the room. And it may be configured as a combined air conditioning and air conditioner for cooling or heating the room.
  • Such an air conditioner is classified into a conventional air conditioner in which one indoor unit is connected to one outdoor unit, and a multi-type air conditioner in which a plurality of indoor units are connected to at least one outdoor unit.
  • a multi-type air conditioner is used for selectively air conditioning a plurality of spaces partitioned in a building, and a plurality of compressors are provided to selectively operate the required number according to the total air conditioning load.
  • Compressor is a device for compressing refrigerant, which prevents abrasion of friction part of operating part, cools part of heat generated during compression, disperses fatigue of metal parts, and forms oil film on sealing line to prevent leakage of compressed refrigerant.
  • the oil contained in the compressor is mixed and discharged.
  • the refrigerant flows to one side of the flow path, thereby impeding the refrigerant flow, and the amount of oil in the compressor is reduced, thereby reducing the performance of the compressor. Can be.
  • the air conditioner is provided with an oil separator for separating the oil mixed in the refrigerant discharged from the compressor to return to the compressor.
  • an oil separator for separating the oil mixed in the refrigerant discharged from the compressor to return to the compressor.
  • each oil separator separates and recovers the refrigerant discharged from each compressor. Insufficient oil can cause compressor failure due to poor lubrication. In addition, when the oil is excessive, the efficiency of the compressor is reduced by increasing the power required of the motor inside the compressor.
  • the problem to be solved by the present invention is to provide an air conditioner for efficiently recovering by separating the oil mixed in the refrigerant compressed in the plurality of compressors together.
  • an air conditioner for compressing the refrigerant;
  • An oil separator connected to the plurality of compressors to mix the refrigerant compressed in the plurality of compressors to separate oil mixed in the refrigerant;
  • An oil discharge pipe connected to the oil separator to discharge oil separated from the oil separator;
  • a plurality of oil recovery tubes branched from the oil discharge pipe and separated from the oil separator to be recovered to the plurality of compressors.
  • the oil mixed in the refrigerant compressed in the plurality of compressors are separated together in one oil separator, and the oil is recovered to the necessary compressor to eliminate the oil imbalance.
  • the refrigerant compressed in the plurality of compressors efficiently flows into one oil separator, thereby effectively separating the oil mixed in the refrigerant.
  • the oil level sensor is provided inside the compressor to control the recovery of oil according to the oil level.
  • the oil pump is provided in the compressor has the advantage that the oil recovery is efficient.
  • the oil is recovered to the refrigerant inlet port of the compressor has the advantage that the oil recovery is efficient.
  • FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention.
  • FIG. 2 is a partially cutaway perspective view of an oil separator according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view taken along the line AA ′ of the oil separator shown in FIG. 2.
  • FIG. 4 is a side view of the oil separator shown in FIG. 2.
  • FIG. 5 is a configuration diagram of an air conditioner according to another embodiment of the present invention.
  • FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention.
  • An air conditioner includes a plurality of compressors 110 for compressing a refrigerant, a condenser 130 for condensing the compressed refrigerant by heat exchange with air, and an expansion device for expanding the condensed refrigerant ( 140, an evaporator 150 in which the expanded refrigerant exchanges heat with air, and an oil separator 160 separating oil mixed in the refrigerant compressed and discharged by the plurality of compressors 110.
  • a gas-liquid separator 120 may be provided between the evaporator 150 and the plurality of compressors 110 to separate the gaseous refrigerant and the liquid refrigerant.
  • the condenser 130 When the air conditioner is operated as a cooler, the condenser 130 corresponds to an outdoor heat exchanger disposed outdoors to exchange heat between the refrigerant and outdoor air, and the evaporator 150 corresponds to an indoor heat exchanger disposed indoors to exchange heat between the refrigerant and indoor air. .
  • the condenser 130 When the air conditioner is operated as a heater, the condenser 130 corresponds to an indoor heat exchanger that is disposed indoors to exchange heat between the refrigerant and indoor air, and the evaporator 150 corresponds to an outdoor heat exchanger that heats the refrigerant and outdoor air arranged outdoors. .
  • the plurality of compressors 110 compress the incoming low temperature low pressure refrigerant into high temperature high pressure refrigerant.
  • the plurality of compressors 110 may be applied in various structures, and an inverter type compressor or a constant speed compressor may be adopted.
  • the plurality of compressors 110 includes a first compressor 110 (1) and a second compressor 110 (2). It is preferable that both the first compressor 110 (1) and the second compressor 110 (2) are inverter type compressors whose compression capacity is changed according to an operating state.
  • the compressor 110 includes a refrigerant inflow port 111 through which refrigerant flows, a refrigerant discharge port 112 through which compressed refrigerant is discharged, an oil level sensor 113 measuring an oil height therein, and oil into Inflow oil pump 114 is included.
  • the refrigerant inlet port 111 is a port through which the refrigerant is introduced and the suction pipe 199 is connected.
  • the refrigerant inflow port 111 passes through the gas-liquid separator 120 and the refrigerant flowing into the suction pipe 199 is introduced.
  • the first compressor 110 (1) includes a first refrigerant inlet port 111 (1)
  • the second compressor 110 (2) includes a second refrigerant inlet port 111 (2).
  • the first refrigerant inlet port 111 (1) is connected to the first suction pipe 199 (1)
  • the second refrigerant inlet port 111 (2) is connected to the second suction pipe 199 (2). do.
  • the refrigerant discharge port 112 discharges the refrigerant compressed by the compressor.
  • the refrigerant discharge port 112 is connected to the refrigerant discharge pipe 194.
  • the oil inside the compressor 110 is discharged together with the compressed refrigerant.
  • the refrigerant mixed with the oil discharged from the refrigerant discharge port 112 flows to the oil separator 160 through the refrigerant discharge pipe 194.
  • the first compressor 110 (1) includes a first refrigerant discharge port 112 (1)
  • the second compressor 110 (2) includes a second refrigerant discharge port 112 (2).
  • the first refrigerant discharge port 112 (1) is connected to the first refrigerant discharge pipe 194 (1)
  • the second refrigerant discharge port 112 (2) is connected to the second refrigerant discharge pipe 194 (2).
  • the oil level sensor 113 measures the oil height inside the compressor 110. Oil is accommodated in the compressor 110, and the oil lubricates and cools the mechanical device for compressing the refrigerant. The oil is filled in the bottom of the compressor 110 and pumped when the compressor 110 is driven. The oil level sensor 113 measures the height of the oil accommodated in the bottom surface of the compressor 110. It is determined whether or not the oil return valve 196 to be described later is opened or closed according to the oil height measured by the oil level sensor 113.
  • the first compressor 110 (1) includes a first oil level sensor 113 (1)
  • the second compressor 110 (2) includes a second oil level sensor 113 (2).
  • the oil pump 114 is connected to the oil return pipe 195 to introduce the oil separated from the oil separator 160 into the compressor 110.
  • the oil pump 114 is provided inside the compressor 110 to fill the bottom surface of the compressor 110 with oil separated from the oil separator 160.
  • the oil pump 114 is preferably provided below the oil level sensor 113 in the compressor 110.
  • the first compressor 110 (1) comprises a first oil pump 114 (1)
  • the second compressor 110 (2) comprises a second oil pump 114 (2).
  • the oil pump 114 is preferably a trocoid pump that pumps oil.
  • the oil pump 114 is preferably provided in the case of a high pressure compressor, and may be omitted in the case of a low pressure compressor.
  • the oil return pipe 195 may be directly connected to the compressor 110.
  • the oil pump 114 may be a pump that is provided inside the compressor 110 rather than a pump that is separately provided to pump oil of the bottom of the compressor upward.
  • a pump is preferably a trocoid pump for pumping oil upwards, and the oil in the compressor 110 is pumped upward to suck the oil in the oil return pipe 195 into the compressor 110.
  • the oil return pipe 195 is not directly connected to the oil pump 114.
  • the oil separator 160 is connected to the plurality of compressors 110 so that the refrigerant compressed in the plurality of compressors 110 flows in an arc shape and is mixed while turning to separate oil mixed in the refrigerant.
  • the detailed structure of the oil separator 160 will be described later with reference to FIGS. 2 to 4.
  • the oil separator 160 is provided in a single stage and connected to the first compressor 110 (1) and the second compressor 110 (2).
  • the oil separator 160 and the plurality of compressors 110 are connected to the plurality of refrigerant discharge pipes 194.
  • the plurality of refrigerant discharge tubes 194 are connected to the refrigerant discharge ports 112 of the plurality of compressors 110, respectively.
  • Each of the plurality of coolant discharge pipes 194 is preferably provided with a check valve to prevent the backflow of the coolant.
  • the plurality of refrigerant discharge tubes 194 may include a first refrigerant discharge tube 194 (1) connecting the first compressor 110 (1) and the oil separator 160, a second compressor 110 (2), and the like. And a second refrigerant discharge pipe 194 (2) connecting the oil separator 160.
  • the oil separated in the oil separator 160 is discharged to the oil discharge pipe 192.
  • the oil discharge pipe 192 is connected to the oil separator 160 to discharge the oil separated from the oil separator 160.
  • the oil discharge pipe 192 is branched into the plurality of oil recovery pipes 195.
  • the oil discharge pipe 192 is preferably provided with a check valve to prevent the back flow of oil.
  • the refrigerant from which oil is separated in the oil separator 160 is discharged to the discharge pipe 191.
  • the refrigerant discharged from the oil separator 160 to the discharge pipe 191 flows to the condenser 13.
  • the discharge pipe 191 connects the oil separator 160 and the condenser 130.
  • the oil recovery tube 195 is a tube in which the oil separated in the oil separator 160 flows and is recovered to the compressor 110.
  • the oil return pipe 195 connects the oil discharge pipe 192 and the compressor 110.
  • the oil return pipe 195 is connected to the compressor 110 and may be directly connected to the oil pump 114.
  • the oil recovery pipe 195 is provided in plural, and the plurality of oil recovery pipes 195 are connected to the oil discharge pipe 192.
  • the plurality of oil recovery pipes 195 are branched from the oil discharge pipe 192 so that the oil separated from the oil separator 160 is recovered to the plurality of compressors 110.
  • the plurality of oil recovery pipes 195 may include a first oil recovery pipe 195 (1) connecting the oil discharge pipe 192 and the first compressor 110 (1), an oil discharge pipe 192, and a second compressor ( And a second oil return pipe 195 (2) connecting 110 (2).
  • the oil recovery valve 196 is installed in the oil recovery pipe 195 to open and close the oil recovery pipe 195.
  • the oil return valve 196 allows or blocks oil separated in the oil separator 160 to be returned to the compressor 110.
  • the oil return valve 196 opens and closes according to the oil height measured by the oil level sensor 113.
  • the oil in the compressor 110 connected to the oil return pipe 195 having the oil return valve 196 is opened when the oil level sensor 113 is lower than the oil level sensor 113 and closed when the oil return sensor 196 is higher than the oil level sensor 113.
  • a plurality of oil recovery valves 196 are provided, and a plurality of oil recovery valves 196 are respectively provided in the plurality of oil recovery pipes 195 to open and close the plurality of oil recovery pipes 195, respectively.
  • the plurality of oil recovery valves 196 are installed in the first oil recovery valve 196 (1) and the second oil recovery pipe 195 (2) provided in the first oil recovery pipe 195 (1).
  • the first oil return valve 196 (1) is opened when the height of the oil inside the first compressor 110 (1) is equal to or less than the first oil level sensor 113 (1), and the first oil level sensor 113. (1)) If more than one is closed.
  • the second oil return valve 196 (2) is opened when the height of the oil inside the second compressor 110 (2) is equal to or less than the second oil level sensor 113 (2), and the second oil level sensor If it is more than (113 (2)), it is closed.
  • the gas-liquid separator 120 separates the gaseous phase refrigerant and the liquid phase refrigerant from the refrigerant evaporated in the evaporator 150.
  • the gaseous refrigerant separated by the gas-liquid separator 120 flows to the plurality of suction pipes 199.
  • the plurality of suction pipes 199 may include a first suction pipe 199 (1) connected to the first compressor 110 (1) and a second suction pipe 199 connected to the second compressor 110 (2). 2)).
  • the refrigerant compressed by the plurality of compressors 110 is discharged together with the oil through the respective refrigerant discharge ports 112.
  • the refrigerant and the oil discharged to the refrigerant discharge ports 112 of the plurality of compressors 110 are respectively introduced into the oil separator 160 through the plurality of refrigerant discharge pipes 194.
  • the oil separator 160 separates the refrigerant and the oil.
  • the refrigerant from which oil is separated in the oil separator 160 is discharged to the discharge pipe 191.
  • the oil separated in the oil separator 160 is discharged to the oil discharge pipe 192, respectively.
  • the oil discharged to the oil discharge pipe 192 flows differently according to oil heights in the plurality of compressors 110 measured by the plurality of oil level sensors 113.
  • the height of the oil inside the first compressor 110 (1) is equal to or less than the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil level sensor ( Above 113 (2)), the first oil return valve 196 (1) is opened and the second oil return valve 196 (2) is closed.
  • all the oil separated in the oil separator 160 is recovered to the first compressor 110 (1). That is, the oil separated from the oil separator 160 is passed through the oil discharge pipe 192 and the first oil recovery pipe 195 (1) by the first oil pump 114 (1) by the first compressor 110 (1). Is recovered).
  • the height of the oil inside the first compressor 110 (1) is greater than or equal to the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil level sensor ( Below 113 (2)), the first oil return valve 196 (1) is closed and the second oil return valve 196 (2) is opened.
  • all the oil separated in the oil separator 160 is recovered to the second compressor 110 (2). That is, the oil separated from the oil separator 160 is passed through the oil discharge pipe 192 and the second oil recovery pipe 195 (2) by the second oil pump 114 (2) by the second compressor 110 (2). Is recovered).
  • the height of the oil inside the first compressor 110 (1) is equal to or less than the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil level sensor ( 113 (2) or less, the first oil return valve 196 (1) is opened, and the second oil return valve 196 (2) is also opened.
  • the oil separated in the oil separator 160 is recovered to the first compressor 110 (1) and the second compressor 110 (2). That is, the oil separated from the oil separator 160 is discharged to the oil discharge pipe 192, and the oil flowing to the first oil recovery pipe 195 (1) is discharged by the first oil pump 114 (1).
  • the oil returned to the first compressor 110 (1) and flowed to the second oil recovery pipe 195 (2) is transferred to the second compressor 110 (2) by the second oil pump 114 (2). It is recovered.
  • FIG. 2 is a partially cutaway perspective view of an oil separator according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view taken along the line A-A 'of the oil separator shown in FIG. 2
  • FIG. 4 is an oil shown in FIG. 2.
  • the oil separator 160 includes a cylindrical case 161 having a circular cross section in a horizontal direction, and a plurality of suction pipes 164 into which the refrigerant mixed with oil is introduced into the case 161. And a refrigerant discharge pipe 163 inserted in the vertical direction from the upper side of the case 161 to discharge the refrigerant in the case 161, and connected to the lower side of the case 161 to discharge the oil inside the case 161.
  • An oil discharge pipe 165 is included.
  • the case 161 is formed in a cylindrical shape to form a sealed accommodation space.
  • the case 161 has a circular cross section in a horizontal direction.
  • the horizontal cross section of the case 161 may be a shape substantially close to a circle rather than a perfect circle.
  • the horizontal direction refers to the height direction of the cylindrical case 161 as a direction perpendicular to the gravity direction
  • the vertical direction refers to the height direction of the case 161 in the gravity direction
  • a plurality of suction pipes 164 are connected to a side of the case 161, a refrigerant discharge pipe 163 is connected to an upper side thereof, and an oil discharge pipe 165 is connected to a lower side thereof.
  • the case 161 is supported from the bottom surface by the support member 162.
  • the support member 162 is preferably coupled to the bottom surface of an outdoor unit (not shown) in which the compressor 110 of the air conditioner is installed.
  • the plurality of suction pipes 164 are connected to the case 161 and are passages through which refrigerant containing oil flows into the case 161.
  • the plurality of suction pipes 164 guide the refrigerant compressed by the plurality of compressors 110 to be introduced into the case 161 and mixed.
  • the plurality of suction pipes 164 are respectively connected to the plurality of refrigerant discharge pipes 194 through which the refrigerant compressed by the plurality of compressors 110 is discharged.
  • Each suction pipe 164 and the refrigerant discharge pipe 194 may be integrally formed or connected at a portion connected to the case 161.
  • the plurality of suction pipes 164 are respectively inserted into the side of the case 161.
  • the plurality of suction pipes 164 may be connected to the case 161 at the upper side of the case 161, respectively.
  • each of the plurality of suction pipes 164 is bent along the inner surface of the case 161 inside the case 161.
  • Each of the plurality of suction pipes 164 guides the refrigerant mixed with oil to turn inside the case 161.
  • the oil-mixed refrigerant passes through the bent suction pipe 164, the oil-mixed refrigerant moves and moves toward the inner surface of the case 161 in the radial direction, due to centrifugal force.
  • the oil contacts the inner surface of the case 161, the oil flows along the inner surface of the case 161 in the vertical direction in the gravity direction and is discharged to the oil discharge pipe 165.
  • Each of the plurality of suction pipes 164 is formed in an arc shape inside the case 161. At this time, it is preferable that each of the plurality of suction pipes 164 has the same curvature as the horizontal cross section of the case 161 in the horizontal direction.
  • the refrigerant compressed by the compressor 110 flows in an arc shape along the suction pipe 164 bent in an arc shape and rotates to separate oil mixed in the refrigerant.
  • the suction pipe 164 is formed in an arc shape from the suction pipe connecting portion 164b where the suction pipe 164 is connected to the case 161 to the suction pipe end 164a through which oil is discharged.
  • the suction pipe 164 preferably forms an arc having a central angle of 90 degrees or less from the suction pipe connecting portion 164b to the suction pipe end 164a.
  • each of the plurality of suction tubes 164 has an arc shape having a central angle of 90 degrees or less so that the plurality of suction tubes 164 do not interfere with each other in the case 161.
  • each of the plurality of suction pipes 164 may be bent upward along the inner surface of the case 161 along the inner surface of the case 161. At this time, the upper side is the direction opposite to the gravity direction.
  • the suction pipe 164 may be formed such that the suction pipe end 164a is positioned higher than the suction pipe connecting portion 164b.
  • the refrigerant rotates downward by its own weight, flows in a spiral shape, and oil is separated.
  • the refrigerant may flow and rotate longer than when horizontally discharged to separate more oil.
  • each of the plurality of suction pipes 164 When each of the plurality of suction pipes 164 is bent upwards, each of the plurality of suction pipes 164 is formed in a circular arc shape projected to the horizontal plane inside the case 161, the shape projected to the vertical plane is also formed in an arc shape Can be. At this time, it is preferable that each of the plurality of suction pipes 164 has the same curvature as the horizontal cross section of the case 161.
  • the plurality of suction pipes 164 are inserted into the first suction pipe 164 (1) inserted into the side of the case 161 and the second suction pipe inserted into the opposite side to the first suction pipe 164 (1) from the side of the case 161. (164 (2)).
  • the first suction pipe 164 (1) guides the refrigerant compressed by the first compressor 110 (1) to flow into the case 161, and the second suction pipe 164 (2) provides the second compressor 110.
  • the refrigerant compressed in (2)) is guided to flow into the case 161.
  • the first suction pipe 164 (1) is connected to the first refrigerant discharge pipe 194 (1)
  • the second suction pipe 164 (2) is connected to the second refrigerant discharge pipe 194 (2).
  • the first suction pipe connecting portion 164b (1) of the first suction pipe 164 (1) and the second suction pipe connecting portion 164b (2) of the second suction pipe 164 (2) have a center on the refrigerant discharge pipe 163. They are arranged symmetrically on opposite sides of each other.
  • the first suction pipe connecting portion 164b (1) and the second suction pipe connecting portion 164b (2) are disposed on a line passing through the center of the horizontal cross section of the case 161. That is, the first suction pipe connecting portion 164b (1) and the second suction pipe connecting portion 164b (2) are disposed on the diameter line of the horizontal cross section of the case 161.
  • the first suction pipe 164 (1) and the second suction pipe 164 (2) are bent in the same direction in the case 161. Both the first suction pipe 164 (1) and the second suction pipe 164 (2) are bent clockwise or counterclockwise when viewed in the horizontal direction. In this embodiment, both the first suction pipe 164 (1) and the second suction pipe 164 (2) are bent counterclockwise when viewed from the upper side to guide the refrigerant to turn counterclockwise in the same direction. In addition, both the first suction pipe 164 (1) and the second suction pipe 164 (2) may be bent upward in the case 161.
  • the first suction pipe 164 (1) and the second suction pipe 164 (2) are formed symmetrically with respect to the refrigerant discharge pipe 163.
  • the first suction pipe 164 (1) and the second suction pipe 164 (2) are preferably formed to have the same length inside the case 161 and are bent in the same direction.
  • the first suction pipe end 164a (1) of the first suction pipe 164 (1) and the second suction pipe end 164a (2) of the second suction pipe 164 (2) are centered on the refrigerant discharge pipe 163. Are arranged on opposite sides of each other.
  • the first suction pipe end 164a (1) and the second suction pipe end 164a (2) are disposed on a line passing through the center of the horizontal cross section of the case 161. That is, the first suction pipe end 164a (1) and the second suction pipe end 164a (2) are disposed on the diameter line of the horizontal cross section of the case 161.
  • the refrigerant discharge pipe 163 is inserted in the vertical direction from the upper side of the case 161.
  • an end portion at which the refrigerant is sucked is preferably disposed below the plurality of suction pipes 164.
  • the refrigerant passing through the plurality of suction pipes 164 is rotated downward and mixed to flow in a spiral shape, and when oil is separated, the refrigerant is discharged to the outside of the case 161 through the refrigerant discharge pipe 163.
  • the refrigerant discharge pipe 163 is connected to the discharge pipe 191.
  • the refrigerant discharge pipe 163 may be integrally formed with the discharge pipe 191 or may be connected at a portion connected to the case 161.
  • the refrigerant discharged into the refrigerant discharge pipe 163 flows to the condenser 130 along the discharge pipe 191.
  • the oil discharge pipe 165 is connected to the lower side of the case 161.
  • the oil separated from the refrigerant flows down the inner surface of the case 161 and the oil collected at the bottom of the case 161 is discharged to the outside of the case 161 through the oil discharge pipe 165.
  • the oil discharge pipe 165 is connected to the oil discharge pipe 192.
  • the oil discharge pipe 165 and the oil discharge pipe 192 may be integrally formed.
  • the oil discharged to the oil discharge pipe 165 is recovered to the plurality of compressors 110 through the oil discharge pipe 192 and the plurality of oil recovery pipes 195.
  • the refrigerant containing the oil discharged from the first compressor 110 (1) is introduced into the case 161 through the first suction pipe 164 (1) and discharged from the second compressor 110 (2).
  • the refrigerant containing oil flows into the case 161 through the second suction pipe 164 (2).
  • the refrigerant introduced through the first suction pipe 164 (1) and the refrigerant introduced through the second suction pipe 164 (2) are mixed in a direction that flows downward.
  • the oil-containing refrigerant turns in a spiral shape, the oil contacts the inner surface of the case 161 by centrifugal force and flows down into the oil discharge pipe 165.
  • the refrigerant from which oil is separated is discharged through the refrigerant discharge pipe 163.
  • FIG. 5 is a configuration diagram of an air conditioner according to another embodiment of the present invention.
  • the plurality of oil return pipes 295 of the air conditioner according to another embodiment of the present invention are connected to the refrigerant inlet ports 211 of the plurality of compressors 210, respectively.
  • the plurality of compressors 210 are low pressure compressors and do not require an oil pump.
  • the plurality of oil recovery pipes 295 may include a first oil recovery pipe 295 (1) connected to the first refrigerant inlet port 211 (1) of the first compressor 210 (1), and a second compressor ( And a second oil return pipe 295 (2) connected to the second refrigerant inlet port 211 (2) of 210 (2).
  • the refrigerant inlet port 211 is connected to the suction pipe 299 and the oil recovery pipe 295 and separated from the refrigerant and the oil separator 260 flowing through the gas-liquid separator 120 to the suction pipe 299 to recover the oil. Oil flowing into the tube 295 is introduced.
  • the first oil recovery pipe 295 (1) may be connected to the first suction pipe 299 (1) to be connected to the first refrigerant inlet port 211 (1), and the second oil recovery pipe 295 (2) may be used. )) May be connected to the second suction pipe 299 (2) to be connected to the second refrigerant inlet port 211 (2).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
PCT/KR2012/008589 2011-10-21 2012-10-19 공기조화기 WO2013058595A1 (ko)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12841464.6A EP2778569B1 (de) 2011-10-21 2012-10-19 Klimaanlage
US14/353,106 US20140326008A1 (en) 2011-10-21 2012-10-19 Air conditioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0108202 2011-10-21
KR1020110108202A KR101342649B1 (ko) 2011-10-21 2011-10-21 공기조화기

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WO2013058595A1 true WO2013058595A1 (ko) 2013-04-25

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US (1) US20140326008A1 (de)
EP (1) EP2778569B1 (de)
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CN104791912A (zh) * 2015-04-27 2015-07-22 广东美的暖通设备有限公司 一种多压缩机空调系统及其控制方法
WO2015174022A1 (ja) * 2014-05-13 2015-11-19 ダイキン工業株式会社 油分離装置

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Publication number Publication date
KR101342649B1 (ko) 2013-12-17
EP2778569B1 (de) 2020-12-16
EP2778569A4 (de) 2016-01-27
US20140326008A1 (en) 2014-11-06
KR20130043978A (ko) 2013-05-02
EP2778569A1 (de) 2014-09-17

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