KR20100032200A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
KR20100032200A
KR20100032200A KR1020080091241A KR20080091241A KR20100032200A KR 20100032200 A KR20100032200 A KR 20100032200A KR 1020080091241 A KR1020080091241 A KR 1020080091241A KR 20080091241 A KR20080091241 A KR 20080091241A KR 20100032200 A KR20100032200 A KR 20100032200A
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KR
South Korea
Prior art keywords
refrigerant
heat exchanger
outdoor
expansion
indoor
Prior art date
Application number
KR1020080091241A
Other languages
Korean (ko)
Inventor
이재완
Original Assignee
엘지전자 주식회사
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Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020080091241A priority Critical patent/KR20100032200A/en
Publication of KR20100032200A publication Critical patent/KR20100032200A/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B40/00Subcoolers, desuperheaters or superheaters
    • F25B40/02Subcoolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat accumulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02Arrangements 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2507Flow-diverting valves

Abstract

PURPOSE: An air-conditioner is provided to improve heating operation efficiency by minimizing a pressure drop generated from a refrigerant passing through a super-cooler during a heating operation. CONSTITUTION: An air-conditioner comprises a compressor(14), an oil separator(16), an accumulator(12), an outdoor heat exchanger(20), an indoor heat exchanger(6), a cooling/heating switch valve(18), an outdoor expander(26), an interior expander(24), a super-cooler(30), a bypass channel(60), and a check valve(70). The compressor compresses a refrigerant and includes an outlet pipe connected to the oil separator. The accumulator is connected to a suction pipe of the compressor. The outdoor heat exchanger heat-exchanges the refrigerant with exterior air, while the indoor heat exchanger heat-exchanges the refrigerant with internal air. The cooling/heating switch valve is connected to the accumulator, the oil separator, the outdoor heat exchanger and the indoor heat exchanger. The outdoor expander and the interior expander is installed in between the outdoor heat exchanger and the indoor heat exchanger.

Description

 Air Conditioner
 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner in which a refrigerant is supercooled in a supercooler during a cooling operation and the refrigerant bypasses the supercooler in a heating operation.
 In general, an air conditioner is installed for the purpose of cooling / heating indoor air or purifying air to create a more comfortable indoor environment for humans.
In the air conditioner, a compressor, a condenser, an expander, an evaporator, and the like are connected to a refrigerant pipe, and the refrigerant cools or heats the room while circulating the compressor, the condenser, the expander, and the evaporator.
The air conditioner as described above, the cooling efficiency is improved when the refrigerant condensed in the outdoor heat exchanger is improved, and Patent Publication No. 10-2007-0009081 discloses a super-cooling device of a multi-type air conditioner to supercool the refrigerant passing through the outdoor heat exchanger Is disclosed. The supercooling device includes a main pipe for guiding the refrigerant discharged from the outdoor heat exchanger to the indoor heat exchanger, a subcooler installed in the main pipe, a bypass pipe connecting the main pipe and the supercooler on the indoor heat exchanger side, and a bypass pipe. And an electromagnetic expansion valve installed to expand the liquid refrigerant bypassed from the main pipe, and a recovery pipe connecting the subcooler and the accumulator inlet side.
In the air conditioner having the supercooling device as described above, when the compressor is driven during the cooling operation, the refrigerant compressed in the compressor is condensed in the outdoor heat exchanger and then passes through the main pipe, and some of the refrigerant passing through the main pipe is connected to the main pipe. It enters the bypass pipe and expands in the electromagnetic expansion valve. The refrigerant expanded in the electromagnetic expansion valve flows into the supercooler, cools the refrigerant passing through the main pipe, and is supplied to the accumulator through a bypass pipe connected to the suction side of the accumulator.
However, in the air conditioner according to the prior art, since the refrigerant condensed in the indoor heat exchanger during the heating operation passes through the supercooler, the pressure drop of the refrigerant increases, and the efficiency of the heating operation decreases as the pressure drop increases.
The present invention has been made to solve the above problems of the prior art, an object of the present invention is to provide an air conditioner that can minimize the pressure drop caused by the supercooler during heating and the resulting decrease in efficiency.
Another object of the present invention is to provide an air conditioner capable of securing a sufficient degree of subcooling while the refrigerant passes through the subcooler.
Air conditioner according to the present invention for solving the above problems is at least one compressor for compressing the refrigerant; An oil separator connected to the outlet pipe of the compressor; An accumulator connected to the suction pipe of the compressor; An outdoor heat exchanger through which the refrigerant heat exchanges with the outdoor air; An indoor heat exchanger in which the refrigerant heat exchanges with the indoor air; A cooling / heating switching valve connected to the accumulator, the oil separator, the outdoor heat exchanger, and the indoor heat exchanger; An outdoor expansion device and an indoor expansion device installed between the outdoor heat exchanger and the indoor heat exchanger; A supercooler installed between the outdoor expansion device and the indoor expansion device; A bypass flow path connected to allow the refrigerant passing through the indoor expansion device to flow to the outdoor expansion device after bypassing the subcooler during a heating operation; And a check valve installed in the bypass flow path to block refrigerant flow to the bypass flow path during a cooling operation.
One end of the bypass flow path is connected to the refrigerant pipe between the indoor expansion mechanism and the subcooler, and the other end is connected to the refrigerant pipe between the subcooler and the outdoor expansion mechanism.
An air conditioner according to the present invention includes at least one compressor for compressing a refrigerant; An oil separator connected to the outlet pipe of the compressor; An accumulator connected to the suction pipe of the compressor; An outdoor heat exchanger through which the refrigerant heat exchanges with the outdoor air; An indoor heat exchanger in which the refrigerant heat exchanges with the indoor air; A cooling / heating switching valve connected to the accumulator, the oil separator, the outdoor heat exchanger, and the indoor heat exchanger; An outdoor expansion device and an indoor expansion device installed between the outdoor heat exchanger and the indoor heat exchanger; A supercooler installed between the outdoor expansion device and the indoor expansion device; A bypass passage connected to allow the refrigerant passing through the indoor expansion mechanism to flow to the outdoor heat exchanger after bypassing the supercooler and the outdoor expansion mechanism during a heating operation; And a check valve installed in the bypass flow path to block refrigerant flow to the bypass flow path during a cooling operation.
One end of the bypass flow path is connected to the refrigerant pipe between the indoor expansion mechanism and the subcooler, and the other end is connected to the refrigerant pipe between the outdoor expansion mechanism and the outdoor heat exchanger.
The supercooler includes a refrigerant passage through which the refrigerant passing through the outdoor expansion mechanism passes, and a cooling passage through which a refrigerant for cooling the refrigerant passing through the refrigerant passage passes, and the cooling passage includes the accumulator and the refrigerant recovery pipe. A supercooled heat exchanger connected to the furnace; A supercooling bypass pipe connected to the refrigerant passing through the refrigerant passage into the cooling passage; And a subcooled expansion valve disposed in the bypass flow path, wherein the subcooled heat exchanger includes a plate heat exchanger in which the coolant flow path and the cooling flow path are alternately formed with a heat exchanger plate interposed therebetween.
In the air conditioner according to the present invention configured as described above, since the refrigerant passing through the indoor expansion mechanism during the heating operation bypasses the supercooler and flows to the outdoor expansion mechanism, the pressure drop generated when the refrigerant passes through the subcooler during the heating operation. It can be minimized, thereby improving the heating operation performance has the advantage.
In addition, the air conditioner according to the present invention has the advantage that the refrigerant is blocked by the check valve during the cooling operation is passed through all of the sub-cooler, ensuring sufficient subcooling during the cooling operation.
 In addition, in the air conditioner according to the present invention, during the heating operation, a part of the refrigerant bypasses the supercooler and the outdoor expansion mechanism, and the rest of the refrigerant passes through the subcooler and the outdoor expansion mechanism, thereby reducing the pressure drop and expanding the refrigerant. There is an advantage.
 In addition, the air conditioner according to the present invention consists of a plate heat exchanger in which the supercooler is formed between the refrigerant passage and the cooling passage between the heat exchange plate, so that the amount of heat transfer between the refrigerant in the refrigerant passage and the refrigerant in the cooling passage is high, and the supercooling performance of the subcooler is high. There is an advantage.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a block diagram showing a refrigerant flow during the cooling operation of an embodiment of the air conditioner according to the present invention, Figure 2 is a block diagram showing a refrigerant flow during the heating operation of an embodiment of the air conditioner according to the present invention.
As shown in FIGS. 1 and 2, the air conditioner according to the present embodiment is a multi-type air conditioner in which a plurality of indoor units 1, 2 and an outdoor unit 3 are connected to a refrigerant pipe 4, 5 and are cooled. As a heat pump which can switch overheating, it demonstrates as a multi-type heat pump air conditioner below.
Each of the indoor units (1) and (2) comprises an indoor heat exchanger (6) for exchanging refrigerant and indoor air, and an indoor blower (7) installed near the indoor heat exchanger (6) for circulating indoor air. .
 The indoor / outdoor air connection pipes 4 and 5 include a common pipe connected to the outdoor unit 3 and a branch pipe connected to the common pipe and the indoor unit.
The outdoor unit 3 includes an accumulator 12 in which a liquid refrigerant accumulates and only a gaseous refrigerant flows out, at least one compressor 14 receiving and compressing a gaseous refrigerant flowing out of the accumulator 12, and at least one compressor ( An oil separator 16 for separating oil from oil discharged from the refrigerant 14 and oil from the refrigerant, a cooling / heating switching valve 18 that is a four-way valve for selecting a refrigerant flow path according to cooling operation and heating operation, and cooling / An outdoor heat exchanger 20 for exchanging heat exchanged between the refrigerant supplied from the heating switching valve 18 and outdoor air, and an outdoor blower installed near the outdoor heat exchanger 20 to blow outdoor air to the outdoor heat exchanger 20 ( 22).
The accumulator 12 is connected to the suction pipe 13 of the compressor 14.
The oil separator 16 is connected to the outlet pipe 15 of the compressor 14, and is connected to an oil return flow path 17 that guides the oil separated from the refrigerant to the accumulator 12.
The cooling / heating switching valve 18 is compressed by the compressor 14 at the time of cooling so that the refrigerant passing through the oil separator 16 flows to the outdoor heat exchanger 20 while the refrigerant evaporated in the indoor heat exchanger 6 The refrigerant evaporated in the outdoor heat exchanger (20) flows to the cumulator (12), and the refrigerant is compressed in the compressor (14) and passes through the oil separator (16) to the indoor heat exchanger (6). As it flows to the cumulator 12, the accumulator 12, the oil separator 16, the outdoor heat exchanger 20, the indoor heat exchanger 6, and the refrigerant pipe are connected.
On the other hand, the refrigerant pipe 4 between the outdoor heat exchanger 20 and the indoor heat exchanger 8 is provided with expansion mechanisms 24 and 26 for expanding the condensed refrigerant, and the outdoor heat exchanger during the cooling operation of the air conditioner. The subcooler 30 for subcooling the refrigerant passing through the machine 20 is installed.
The expansion mechanisms 24 and 26 consist of an indoor expansion mechanism 24 located in each of the indoor units 1 and 2 and an outdoor expansion mechanism 26 located in the outdoor unit 3.
The indoor expansion mechanism 24 and the outdoor expansion mechanism 26 are made of an electromagnetic expansion valve (EEV) in which the opening degree can be adjusted.
The electronic expansion valve which is the indoor expansion mechanism 24 is adjusted to a predetermined opening degree during the cooling operation to expand the refrigerant, and is fully open during the heating operation to pass the refrigerant without expanding the refrigerant.
The electronic expansion valve 26, which is an outdoor expansion mechanism 26, is fully open during the cooling operation and passes without expanding the refrigerant, and is adjusted to a predetermined degree when heating to expand the refrigerant.
The supercooler 30 passes between the outdoor heat exchanger 20 and the indoor expansion mechanism 24 so that the refrigerant condensed while passing through the outdoor heat exchanger 20 during cooling operation is cooled before being expanded in the indoor expansion mechanism 24. In particular, it is installed between the outdoor expansion mechanism 26 and the indoor expansion mechanism (24).
As shown in FIGS. 1 and 2, the subcooler 30 includes a refrigerant passage 32 through which the refrigerant passing through the outdoor expansion mechanism 26 after condensing in the outdoor heat exchanger 20 passes through the refrigerant passage 32. Subcooling heat exchanger (36) having a cooling passage (34) through which a refrigerant for cooling the refrigerant passing through (32) passes, and a supercooling bypass connected so that refrigerant passing through the refrigerant passage (32) flows into the cooling passage (34). The refrigerant passing through the pipe 38, the subcooled expansion valve 42 provided in the subcooled bypass pipe 38, and the cooling passage 34 is sucked into the accumulator 12, which is the suction side of the compressor 14. And a connected refrigerant recovery pipe 44.
The refrigerant passage 32 is a type of heat dissipation passage through which the refrigerant condensed while passing through the outdoor heat exchanger 20 loses heat to the refrigerant expanded in the subcooled expansion valve 42. The refrigerant heat exchanger 20 and the indoor heat exchanger 8 It is installed in communication with the refrigerant pipe (4) between.
The refrigerant passage 32 is connected to the outdoor expansion device 26 and the outdoor expansion device connecting pipe 52, and is connected to the indoor expansion device 54 and the indoor expansion device connecting pipe 54.
The cooling flow path 34 is a kind of endothermic flow path through which the refrigerant expanded in the subcooled expansion valve 42 after passing through the refrigerant flow path 32 absorbs heat of the refrigerant passing through the refrigerant flow path 32. 38 and the refrigerant recovery pipe 44 are connected.
The supercooled heat exchanger 36 is a plate heat exchanger in which the refrigerant passage 32 and the cooling passage 34 are alternately formed with the heat exchange plate 35 interposed therebetween.
One end of the subcooling bypass pipe 38 is connected to the indoor expansion mechanism connecting pipe 54 and the other end is connected to the cooling channel 34.
The supercooled bypass pipe 38 connects the bypass inlet pipe 39 connecting the indoor expansion mechanism connecting pipe 54 and the subcooled expansion valve 42 to the subcooled expansion valve 42 and the cooling passage 34. Bypass outlet pipe 40 is included.
The subcooled expansion valve 42 allows the refrigerant passing through the subcooled bypass pipe 38 to expand at low temperature and low pressure, and is composed of an electromagnetic expansion valve (EEV).
The supercooled expansion valve 42 is also adjusted to expand as the refrigerant passes through during the cooling operation, and is hermetically controlled to prevent the refrigerant from passing through the subcooling bypass pipe 38 during the heating operation.
One end of the refrigerant recovery pipe 44 is connected to the cooling passage 34, and the other end thereof is connected to the refrigerant pipe 19 between the cooling / heating switching valve 18 and the accumulator 12.
That is, in the subcooling bypass pipe 38, the subcooling expansion valve 42, the cooling channel 34, and the refrigerant recovery pipe 44, some of the refrigerant that has passed through the refrigerant channel 32 is indoor expansion mechanism 24 and the room. It functions as a kind of indoor unit bypass flow path which bypasses the heat exchanger 6 to be sucked into the accumulator 12 which is the suction side of the compressor.
 On the other hand, in the air conditioner according to the present embodiment, the refrigerant passing through the indoor expansion mechanism 24 during the heating operation flows to the outdoor expansion mechanism 26 after bypassing the supercooler 30, in particular the subcooling heat exchanger 36. A bypass flow path 60 connected to each other; It further includes a check valve 70 installed in the bypass flow path 60 to block the flow of the refrigerant to the bypass flow path 60 during the cooling operation.
The bypass flow path 60 is a kind of subcooled heat exchanger bypass flow path that allows the refrigerant flowing through the indoor expansion mechanism connecting pipe 54 to bypass the supercooled heat exchanger 36 while passing through the bypass flow path 62 during heating operation. One end is connected to the indoor expansion device connecting pipe 54, which is a refrigerant pipe between the indoor expansion device 24 and the subcooler 30, and the other end of the refrigerant pipe between the subcooler 30 and the outdoor expansion device 26. It is connected to the outdoor expansion mechanism connecting pipe (52).
The bypass flow path 60 is connected between the subcooling bypass pipe 38 and the indoor expansion mechanism 24 so that the refrigerant is bypassed at all positions leading to the subcooling bypass pipe 38 during the heating operation.
The check valve 70 does not bypass the supercooled heat exchanger 36 while the refrigerant flowing in the outdoor expansion mechanism connecting pipe 52 passes through the bypass passage 62 during the cooling operation, and does not bypass the subcooled heat exchanger 36 during the heating operation. The refrigerant flowing through 54 passes through the bypass flow path 62 to bypass the supercooled heat exchanger 36.
   Looking at the operation of the present embodiment configured as described above are as follows.
First, during the cooling operation, the compressor 14 is driven, and the compressor 14 discharges a high-temperature, high-pressure gas phase refrigerant. The refrigerant discharged from the compressor 14 is separated from the oil in the oil separator 16 and flows into the outdoor heat exchanger 20 through the cooling / heating switching valve 18. The refrigerant introduced into the outdoor heat exchanger 20 is condensed by being exchanged with outdoor air while passing through the outdoor heat exchanger 20.
The refrigerant condensed in the outdoor heat exchanger 20 as described above passes through the outdoor expansion mechanism 26 without expansion, and flows into the outdoor expansion mechanism connection pipe 52.
The refrigerant introduced into the outdoor expansion mechanism connecting pipe 52 does not flow into the bypass passage 60 due to the check valve 70 installed in the bypass passage 60, and all of the refrigerant flows into the subcooler 30, in particular, the subcooling heat exchanger. It is sucked into the group 36 and supercooled.
Hereinafter, the subcooling process in the subcooler 30 will be described in detail. The refrigerant sucked into the subcooling heat exchanger 36 through the outdoor expansion mechanism connecting pipe 52 passes through the refrigerant passage 32 and then the indoor expansion mechanism. It flows out to the connection pipe 54, a part of the refrigerant flowed into the indoor expansion mechanism connection pipe 54 flows to the subcooling bypass pipe 38 is expanded to a low temperature low pressure in the subcooling expansion valve 42 and then the subcooling heat exchanger ( The refrigerant moved to the cooling passage 34 of the 36, and the refrigerant moved to the cooling passage 34 as described above absorbs heat of the refrigerant passing through the refrigerant passage 32 to supercool the refrigerant passing through the refrigerant passage 32. After that, the suction is sucked into the accumulator 12 through the refrigerant recovery pipe 44.
That is, the coolant is supercooled while passing through the coolant flow path 32 of the subcooled heat exchanger 36, and the coolant that does not flow into the subcooled bypass pipe 38 among the supercooled coolant flows to the indoor expansion mechanism 24, and thus the indoor expansion mechanism. Inflated at 24.
The refrigerant expanded in the indoor expansion mechanism (24) is evaporated by heat exchange with the indoor air in the indoor heat exchanger (6), and then passes through the cooling / heating switching valve (18) and the refrigerant recovered in the refrigerant recovery pipe (44). Together, it is sucked into the accumulator 12 and sucked by the compressor 14.
On the other hand, during the heating operation, the compressor 14 is driven, and the high temperature and high pressure gaseous refrigerant discharged from the compressor 14 is separated from the oil in the oil separator 16, and passes through the cooling / heating switching valve 18 to indoor. Flows into the heat exchanger (6). The refrigerant introduced into the indoor heat exchanger 6 is condensed by being exchanged with the indoor air while passing through the indoor heat exchanger 20.
The refrigerant condensed in the outdoor heat exchanger 20 as described above passes through the indoor expansion mechanism 24 without expansion and flows to the indoor expansion mechanism connection pipe 54.
Part of the refrigerant flowing into the indoor expansion mechanism connecting pipe 54 flows into the bypass passage 60 to bypass the subcooling heat exchanger 36, and the remaining portion passes through the refrigerant passage 32 of the subcooling heat exchanger 36. The refrigerant that has bypassed the subcooling heat exchanger 36 and the refrigerant passing through the refrigerant passage 32 of the subcooling heat exchanger 36 are combined in the outdoor expansion mechanism connecting pipe 52.
Meanwhile, the refrigerant combined in the outdoor expansion mechanism connection pipe 52 is expanded in the outdoor expansion mechanism 26 and then flows to the outdoor heat exchanger 20, and then heat exchanges with outdoor air in the outdoor heat exchanger 20 to evaporate.
The refrigerant evaporated as described above is sucked into the accumulator 12 together with the refrigerant recovered by the refrigerant recovery pipe 44 after passing through the cooling / heating switching valve 18, and is sucked into the compressor 14.
When a part of the refrigerant bypasses the subcooled heat exchanger 36 as described above, the pressure drop is reduced and the heating efficiency is increased when the refrigerant passes through the subcooled heat exchanger 36.
3 is a block diagram showing a refrigerant flow during the cooling operation of another embodiment of the air conditioner according to the present invention, Figure 4 is a block diagram showing a refrigerant flow during the heating operation of another embodiment of the air conditioner according to the present invention.
In the air conditioner according to the present embodiment, as shown in FIG. 3, the refrigerant passing through the indoor expansion mechanism 24 during the heating operation bypasses the supercooler 30 and the outdoor expansion mechanism 26, and then performs outdoor heat exchange. And a bypass flow path 60 'connected to flow to the air 20, and other configurations and actions of the check valve 70 and the supercooler 30, etc., other than the bypass flow path 60' are provided. Since it is the same as the embodiment, the same reference numerals are used and detailed description thereof will be omitted.
   The bypass flow path 60 'allows the refrigerant flowing through the indoor expansion device connecting pipe 54 to bypass the subcooled heat exchanger 36 and the outdoor expansion device 26 while passing through the bypass flow path 62 during the heating operation. A kind of subcooling heat exchanger and outdoor expansion device bypass flow path, one end of which is connected to the indoor heat exchanger connecting pipe 54 which is a refrigerant pipe between the indoor expansion device 24 and the subcooler 30, and the other end of the outdoor expansion device ( It is connected to the outdoor expansion device-outdoor heat exchanger connection pipe 21, which is a refrigerant pipe between the 26 and the outdoor heat exchanger 20.
Hereinafter, the operation of the present embodiment configured as described above will be described.
In the air conditioner according to the present embodiment, the refrigerant condensed in the outdoor heat exchanger 20 during the cooling operation is not blocked by the check valve 70 and flows into the bypass flow path 60 'as in the exemplary embodiment of the present invention. After passing through the outdoor expansion mechanism 26 without expansion, it is supercooled by the subcooler 30.
On the other hand, the refrigerant that condensed in the indoor heat exchanger (6) during the heating operation and passes through the indoor expansion mechanism (6) without expansion flows into the indoor expansion mechanism connecting pipe (54) and flows into the indoor expansion mechanism connecting pipe (54). Some of the refrigerant flows into the bypass flow path 60 'and bypasses the supercooled heat exchanger 36 and the outdoor expansion device 26, and the remaining of the refrigerant flowing into the indoor expansion device connecting pipe 54 is the subcooled heat exchanger 36. After passing through the refrigerant passage 32 of the) is expanded in the outdoor expansion mechanism (26).
As described above, the refrigerant that has bypassed the subcooling heat exchanger 36 and the outdoor expansion mechanism 26 and the refrigerant expanded in the outdoor expansion mechanism 26 after passing through the refrigerant passage 32 of the subcooling heat exchanger 36 are outdoors. It is combined in the expansion device-outdoor heat exchanger connecting pipe 21, and then heat exchanged with the outdoor air in the outdoor heat exchanger 20 to evaporate.
When some of the refrigerant bypasses the subcooling heat exchanger 36 and the outdoor expansion mechanism 26, the refrigerant passes through the subcooling heat exchanger 36 and the outdoor expansion mechanism 26 sequentially. The pressure drop is further reduced, and the heating efficiency is increased.
1 is a block diagram showing a refrigerant flow during the cooling operation of an embodiment of the air conditioner according to the present invention,
2 is a block diagram showing a refrigerant flow during the heating operation of the air conditioner according to an embodiment of the present invention,
 3 is a block diagram showing a refrigerant flow during the cooling operation of another embodiment of the air conditioner according to the present invention,
Figure 4 is a block diagram showing the refrigerant flow during the heating operation of another embodiment of the air conditioner according to the present invention.
<Explanation of symbols on main parts of the drawings>
  1,2: indoor unit 3: outdoor unit
4,5: refrigerant piping 6: indoor heat exchanger
7: indoor blower 12: accumulator
14: Compressor 16: Oil Separator
18: cooling / heating switching valve 20: outdoor heat exchanger
22: outdoor blower 24: indoor expansion device
26: outdoor expansion mechanism 30: subcooler
32: refrigerant passage 34: cooling passage
36: Subcooling heat exchanger 38: Subcooling bypass piping
42: supercooled expansion valve 44: refrigerant recovery piping
52: outdoor expansion device connection piping 54: indoor expansion device connection piping
60, 60 ': Bypass flow path 70: Check valve

Claims (6)

  1. At least one compressor for compressing the refrigerant;
    An oil separator connected to the outlet pipe of the compressor;
    An accumulator connected to the suction pipe of the compressor;
    An outdoor heat exchanger through which the refrigerant heat exchanges with the outdoor air;
    An indoor heat exchanger in which the refrigerant heat exchanges with the indoor air;
    A cooling / heating switching valve connected to the accumulator, the oil separator, the outdoor heat exchanger, and the indoor heat exchanger;
    An outdoor expansion device and an indoor expansion device installed between the outdoor heat exchanger and the indoor heat exchanger;
    A supercooler installed between the outdoor expansion device and the indoor expansion device;
    A bypass flow path connected to allow the refrigerant passing through the indoor expansion device to flow to the outdoor expansion device after bypassing the subcooler during a heating operation;
    And a check valve installed in the bypass flow path to block refrigerant flow into the bypass flow path during a cooling operation.
  2.  The method of claim 1,
    And one end of the bypass passage is connected to the refrigerant pipe between the indoor expansion mechanism and the subcooler, and the other end is connected to the refrigerant pipe between the subcooler and the outdoor expansion mechanism.
  3. At least one compressor for compressing the refrigerant;
    An oil separator connected to the outlet pipe of the compressor;
    An accumulator connected to the suction pipe of the compressor;
    An outdoor heat exchanger through which the refrigerant heat exchanges with the outdoor air;
    An indoor heat exchanger in which the refrigerant heat exchanges with the indoor air;
    A cooling / heating switching valve connected to the accumulator, the oil separator, the outdoor heat exchanger, and the indoor heat exchanger;
    An outdoor expansion device and an indoor expansion device installed between the outdoor heat exchanger and the indoor heat exchanger;
    A supercooler installed between the outdoor expansion device and the indoor expansion device;
    A bypass passage connected to allow the refrigerant passing through the indoor expansion mechanism to flow to the outdoor heat exchanger after bypassing the supercooler and the outdoor expansion mechanism during a heating operation;
    And a check valve installed in the bypass flow path to block refrigerant flow into the bypass flow path during a cooling operation.
  4.  The method of claim 3, wherein
    And one end of the bypass flow path is connected to the refrigerant pipe between the indoor expansion mechanism and the subcooler, and the other end is connected to the refrigerant pipe between the outdoor expansion mechanism and the outdoor heat exchanger.
  5.  The method according to any one of claims 1 to 4,
    The subcooler may include a subcooling heat exchanger including a refrigerant passage through which the refrigerant passing through the outdoor expansion mechanism passes, and a cooling passage through which a refrigerant for cooling the refrigerant passing through the refrigerant passage passes;
    A supercooling bypass pipe connected to the refrigerant passing through the refrigerant passage into the cooling passage;
    A subcooled expansion valve installed in the subcooled bypass pipe,
    Refrigerant passing through the cooling flow path comprises a refrigerant recovery pipe connected to be sucked into the accumulator,
    And the subcooled heat exchanger is a plate heat exchanger in which the refrigerant passage and the cooling passage are alternately formed with a heat exchanger plate interposed therebetween.
  6.  The method of claim 5,
    The bypass flow path is an air conditioner connected between the subcooling bypass pipe and the indoor expansion mechanism.
KR1020080091241A 2008-09-17 2008-09-17 Air conditioner KR20100032200A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090470A (en) * 2011-10-27 2013-05-08 Lg电子株式会社 Air conditioner
KR20140125141A (en) * 2013-04-18 2014-10-28 엘지전자 주식회사 An air conditioning system
KR101877986B1 (en) * 2011-10-27 2018-07-12 엘지전자 주식회사 Air conditioner
CN109682034A (en) * 2018-12-13 2019-04-26 广东美的暖通设备有限公司 Refrigeration system and its control method, air conditioner
CN110542236A (en) * 2019-09-12 2019-12-06 广东美的制冷设备有限公司 Air conditioner, control method and device thereof, and computer-readable storage medium
WO2020159132A1 (en) * 2019-01-28 2020-08-06 삼성전자(주) Air conditioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090470A (en) * 2011-10-27 2013-05-08 Lg电子株式会社 Air conditioner
KR101319778B1 (en) * 2011-10-27 2013-10-17 엘지전자 주식회사 Air conditioner
CN103090470B (en) * 2011-10-27 2015-07-22 Lg电子株式会社 Air conditioner
KR101877986B1 (en) * 2011-10-27 2018-07-12 엘지전자 주식회사 Air conditioner
KR20140125141A (en) * 2013-04-18 2014-10-28 엘지전자 주식회사 An air conditioning system
CN109682034A (en) * 2018-12-13 2019-04-26 广东美的暖通设备有限公司 Refrigeration system and its control method, air conditioner
CN109682034B (en) * 2018-12-13 2021-01-05 广东美的暖通设备有限公司 Refrigerating system, control method thereof and air conditioner
WO2020159132A1 (en) * 2019-01-28 2020-08-06 삼성전자(주) Air conditioner
CN110542236A (en) * 2019-09-12 2019-12-06 广东美的制冷设备有限公司 Air conditioner, control method and device thereof, and computer-readable storage medium

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