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KR101694614B1 - An air conditioner - Google Patents

An air conditioner Download PDF

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Publication number
KR101694614B1
KR101694614B1 KR1020150056578A KR20150056578A KR101694614B1 KR 101694614 B1 KR101694614 B1 KR 101694614B1 KR 1020150056578 A KR1020150056578 A KR 1020150056578A KR 20150056578 A KR20150056578 A KR 20150056578A KR 101694614 B1 KR101694614 B1 KR 101694614B1
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KR
South Korea
Prior art keywords
refrigerant
heat exchanging
heat exchanger
header
distributor
Prior art date
Application number
KR1020150056578A
Other languages
Korean (ko)
Other versions
KR20160074373A (en
Inventor
권상영
이재완
임현준
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 CN201510349531.6A priority Critical patent/CN106196333B/en
Priority to US14/929,474 priority patent/US10156387B2/en
Priority to EP15195188.6A priority patent/EP3040648B1/en
Publication of KR20160074373A publication Critical patent/KR20160074373A/en
Application granted granted Critical
Publication of KR101694614B1 publication Critical patent/KR101694614B1/en

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    • F24F11/0009—
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F24F2011/0064—

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The present invention relates to an air conditioner.
An air conditioner according to an embodiment of the present invention includes: a compressor; A flow switching unit which is disposed at an outlet side of the compressor and switches the flow direction of the refrigerant according to cooling or heating operation; And an outdoor heat exchanger connected to the flow switching unit, wherein the outdoor heat exchanger is provided with refrigerant pipes through which refrigerant flows, the first to third heat exchange units connected in parallel during the heating operation and in series during the cooling operation, ; A first branch portion for branching the refrigerant to a first distribution pipe facing the first heat exchanging portion and a second distribution pipe facing the third heat exchanging portion; A second branching part for branching the refrigerant branched from the first branching part to a first branching tube directed to the first heat exchanging part and a second branching tube directed to the second heat exchanging part; And a first valve device installed in the first distribution pipe. During the heating operation, the first valve device is opened, and some refrigerant passing through the first branch flows into the second distribution pipe, And the remaining refrigerant passes through the first valve device and flows into the first and second branch pipes. During the cooling operation, the first valve device is closed, and the refrigerant passing through the first heat exchange part flows from the first branch pipe Wherein the second branch pipe is connected to the second branch pipe, and flows to the third heat exchange unit via the second heat exchange unit.

Description

An air conditioner

The present invention relates to an air conditioner.

The air conditioner is a device for keeping the air in a predetermined space in a most suitable condition according to the purpose of use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigerant cycle for compressing, condensing, expanding, and evaporating the refrigerant is driven to cool or heat the predetermined space .

The predetermined space may be variously proposed depending on the place where the air conditioner is used. For example, when the air conditioner is installed in a home or an office, the predetermined space may be a house or an indoor space of a building. On the other hand, when the air conditioner is disposed in a car, the predetermined space may be a boarding space on which a person boarded.

When the air conditioner performs the cooling operation, the outdoor heat exchanger provided in the outdoor unit functions as a condenser, and the indoor heat exchanger provided in the indoor unit functions as an evaporator. On the other hand, when the air conditioner performs the heating operation, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator.

Therefore, when the air conditioner performs cooling operation, the refrigerant flowing into the outdoor heat exchanger has a high-temperature, high-pressure, vapor-phase state. At this time, in order to increase the condensing efficiency of the refrigerant, it is advantageous to reduce the number of branch paths branched to the outdoor heat exchanger and lengthen the length of the path. That is, by increasing the length of the refrigerant flow path, the flow rate of the refrigerant can be increased, and consequently the condensation pressure can be reduced, so that the condensation efficiency, that is, the ratio of phase change to liquid phase can be improved.

On the other hand, when the air conditioner performs heating operation, the refrigerant flowing into the outdoor heat exchanger has a two-phase state. At this time, in order to reduce the pressure loss of the refrigerant, it is advantageous to increase the number of branch paths branched to the outdoor heat exchanger and shorten the length of the path. That is, the pressure loss during the flow of the gaseous refrigerant in the two-phase refrigerant may be large. By reducing the length of the refrigerant flow path and increasing the number of branch paths, it is possible to prevent the pressure loss, Thereby improving the evaporation efficiency.

The applicant has filed a patent application related to the structure of such an outdoor heat exchanger as follows.

1. Registration number (Registration date): 10-1233209 (February 15, 2013)

2. Title of the invention: Heat pump

The refrigerant passage of the outdoor heat exchanger according to the related art includes a first unit passage and a second unit passage. One side of the first unit flow path and one side of the second unit flow path are connected in parallel to each other by a first parallel connection flow path, and the other side of the first unit flow path and the other side of the second unit flow path are connected to a second parallel connection flow path Respectively.

A first distributor and a second distributor are installed in the first parallel connection channel, and a first header and a second header are installed in the second parallel connection channel.

The outdoor heat exchanger further includes a series connection flow path for connecting the first unit flow path and the second unit flow path in series during a cooling operation. The series connection passage is formed such that the refrigerant passing through the first unit flow path during the cooling operation is bypassed to the inlet side of the second unit flow passage.

The outdoor heat exchanger may further include flow path switching means provided in the first or second parallel connection flow passage or the series connection flow passage for opening or closing each flow passage, that is, a parallel connection valve, a series connection valve, .

According to the outdoor heat exchanger having such a structure, since the series connection flow path is closed during the heating operation and the series connection flow path is opened during the cooling operation, the flow path is complicated There is a problem that a pressure loss may occur in the piping between refrigerant flows.

In addition, since a separate serial connection valve for opening and closing the serial connection flow passage must be provided, the manufacturing cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner having an outdoor heat exchanger with improved heat exchange efficiency.

An air conditioner according to an embodiment of the present invention includes: a compressor; A flow switching unit which is disposed at an outlet side of the compressor and switches the flow direction of the refrigerant according to cooling or heating operation; And an outdoor heat exchanger connected to the flow switching unit, wherein the outdoor heat exchanger is provided with refrigerant pipes through which refrigerant flows, the first to third heat exchange units connected in parallel during the heating operation and in series during the cooling operation, ; A first branch portion for branching the refrigerant to a first distribution pipe facing the first heat exchanging portion and a second distribution pipe facing the third heat exchanging portion; A second branching part for branching the refrigerant branched from the first branching part to a first branching tube directed to the first heat exchanging part and a second branching tube directed to the second heat exchanging part; And a first valve device installed in the first distribution pipe. During the heating operation, the first valve device is opened, and some refrigerant passing through the first branch flows into the second distribution pipe, And the remaining refrigerant passes through the first valve device and flows into the first and second branch pipes. During the cooling operation, the first valve device is closed, and the refrigerant passing through the first heat exchange part flows from the first branch pipe Wherein the second branch pipe is connected to the second branch pipe, and flows to the third heat exchange unit via the second heat exchange unit.

The outdoor heat exchanger may further include a blowing fan installed at an upper side of the outdoor heat exchanger and blowing outdoor air. The first heat exchanger may be disposed at an upper portion of the outdoor heat exchanger, the second heat exchanger may include a middle portion of the outdoor heat exchanger, And a lower portion of the outdoor heat exchanger is formed.

The number of refrigerant flow paths provided in the first heat exchanging portion or the second heat exchanging portion is greater than the number of refrigerant flow paths provided in the third heat exchanging portion.

In addition, the number of refrigerant flow paths provided in the first heat exchanging portion is greater than the number of refrigerant flow paths provided in the second heat exchanging portion.

Also, the refrigerant flowing in the first branch tube, the refrigerant flowing in the second branch tube, or the refrigerant flowing in the second distribution pipe are divided into multi-stages and introduced into the first to third heat exchangers .

A first distributor provided in the first branch tube for branching the refrigerant passage; A second distributor provided at an outlet side of the first distributor for re-branching the branched refrigerant channels; And a first capillary installed at the outlet side of the second distributor and guiding the refrigerant passing through the second distributor to the first heat exchanger.

A second distributor provided in the second branch tube for branching the refrigerant passage; A fourth distributor provided at an outlet side of the second distributor for re-branching each refrigerant channel branched from the second distributor; And a second capillary installed at the outlet side of the fourth distributor and guiding the refrigerant passing through the fourth distributor to the second heat exchanger.

A fifth distributor installed in the second distribution pipe for branching the refrigerant passage; A sixth distributor installed on an outlet side of the fifth distributor for re-branching each refrigerant channel branched by the fifth distributor; And a third capillary installed at an outlet side of the sixth distributor and guiding the refrigerant passing through the sixth distributor to the third heat exchanger.

The second valve device may further include a second valve device installed in the second distribution pipe, and the first valve device or the second valve device may include an electronic expansion valve capable of adjusting opening degree.

A first header provided in the first heat exchanging unit; A second header provided in the second heat exchanging unit and spaced apart from the first header; And a third header provided in the third heat exchanging unit and spaced apart from the second header.

Also, when the first to third heat exchange units are connected in parallel during the heating operation, the refrigerant introduced into the third heat exchanger is discharged from the third header and flows into the second header, and the refrigerant introduced into the second heat exchanger The refrigerant is discharged from the second header and flows into the first header, and the refrigerant in the first header is discharged from the outdoor heat exchanger.

When the first to third heat exchanging units are connected in series during the cooling operation, the refrigerant flowing into the first heat exchanging unit through the first header flows into the second heat exchanging unit via the first and second branch pipes The refrigerant flowing into the second heat exchanger is discharged from the second header and flows into the third heat exchanger through the third header, and the refrigerant in the third heat exchanger is discharged through the second heat exchanger through the second heat exchanger And is discharged from the vessel.

A first connection pipe connecting the first header and the second header and having a check valve; And a second connection pipe connecting the second header and the third header, wherein the check valve limits the flow of refrigerant from the first header to the second header.

Further, a first coupling plate, which is provided in each of the first to third heat exchanging units and supports one side of the refrigerant pipe, And a second engaging plate for supporting the other side of the refrigerant pipe.

The first to third headers extend in one direction corresponding to the longitudinal direction of the second coupling plate, and are connected to the second coupling plate.

An air conditioner according to another aspect includes: a compressor; A flow switching unit which is disposed at an outlet side of the compressor and switches the flow direction of the refrigerant according to cooling or heating operation; An outdoor heat exchanger connected to the flow switching unit; And a blowing fan installed above the outdoor heat exchanger, wherein the outdoor heat exchanger is provided with refrigerant pipes through which refrigerant flows, the refrigerant pipes being connected in parallel during the heating operation and connected in series during the cooling operation, A heat exchange unit; A first branch portion for branching the refrigerant to a first distribution pipe facing the first heat exchanging portion and a second distribution pipe facing the third heat exchanging portion; And a second branch portion branched from the first branch portion toward the first heat exchange portion and the second branch portion toward the second heat exchange portion, wherein the first heat exchange portion includes a first branch portion The second heat exchanger is located below the first heat exchanger, and the third heat exchanger is located below the second heat exchanger.

A first valve device installed in the first distribution pipe; And a second valve device installed in the second distribution pipe. In the heating operation, the first and second valve devices are opened, and a part of the refrigerant passing through the first branch part flows into the second distribution pipe And the remaining refrigerant passes through the first valve device and flows into the first and second branch pipes. During the cooling operation, the first valve device is closed and the second valve device is opened, so that the first heat exchange The refrigerant passing through the second branch tube flows from the first branch tube to the second heat exchange section via the second branch tube, and is discharged through the third heat exchange section.

A capillary tube disposed at one side of the first to third heat exchanging units; And a header disposed on the other side of the first to third heat exchanging units, wherein during the heating operation, the refrigerant is introduced into the first to third heat exchanging units through the capillary tube, And the third heat exchanging unit.

According to the present invention, the heat exchange efficiency in the outdoor heat exchanger can be improved by forming the number of paths through which the refrigerant passes through the outdoor heat exchanger and the length of the path differently during the cooling operation and the heating operation of the air conditioner .

In particular, since at least three headers are provided in the outdoor heat exchanger, the number of refrigerant paths can be easily changed during cooling or heating operation.

In detail, when the air conditioner performs the cooling operation, the number of the refrigerant paths flowing into the outdoor heat exchanger is reduced and the length of the refrigerant path passing through the three headers is increased, thereby increasing the flow rate of the refrigerant, The condensation efficiency can be improved.

When the air conditioner performs the heating operation, the number of paths through which the refrigerant flows into the outdoor heat exchanger is increased and the length of the path is shortened, thereby reducing the pressure loss of the refrigerant, The efficiency can be improved.

Further, since it is not necessary to provide a separate variable path passage and a valve device described in the related art, there is an advantage that the manufacturing cost of the outdoor heat exchanger can be reduced.

Further, a blowing fan for blowing outside air is disposed above the outdoor heat exchanger, so that the air flow rate passing through the upper side of the outdoor heat exchanger becomes larger than the air flow rate passing through the lower side, The flow path can be constituted so that the amount of the refrigerant fluid (or the amount of heat exchange) is formed to be larger than the amount of the downstream side refrigerant fluid (or the amount of heat exchange), so that the heat exchange efficiency can be improved.

Particularly, in order to increase the amount of the upper side heat exchange, the refrigerant is branched from the first distribution pipe of the first and second heat exchange units and the second distribution pipe of the third heat exchange unit through the first branch, To the first heat exchanging part and the second heat exchanging part.

The first distribution pipe and the second distribution pipe are provided with a valve device so that the amount of refrigerant flowing to the upper side and the lower side of the outdoor heat exchanger can be easily controlled.

Also, the refrigerant distribution structure of the outdoor heat exchanger may include a multi-stage distribution structure, that is, a first distributor and a second distributor so as to increase the number of flow paths of the refrigerant, and a capillary tube connected to the first distributor or the second distributor The amount of refrigerant to be dispensed can be easily adjusted by adjusting the length.

1 and 2 are views showing a configuration of an outdoor unit according to an embodiment of the present invention.
3 is a system diagram showing an outdoor configuration according to an embodiment of the present invention.
4 is a view showing a main configuration of an outdoor heat exchanger according to an embodiment of the present invention.
FIG. 5 is a view showing a state in which refrigerant flows when the air conditioner is in the cooling operation according to the embodiment of the present invention.
FIG. 6 is a view showing a flow of a refrigerant when the air conditioner is in a heating operation according to an embodiment of the present invention. FIG.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

FIG. 3 is a system diagram showing an outdoor configuration according to an embodiment of the present invention. FIG. 4 is a block diagram of an outdoor unit according to an embodiment of the present invention. FIG. 3 is a view showing a main configuration of an outdoor heat exchanger. FIG.

Referring to FIG. 1, the air conditioner 10 according to the embodiment of the present invention includes an outdoor unit arranged outdoors and an indoor unit arranged in the room. The indoor unit includes an indoor heat exchanger that exchanges heat with air in the indoor space. Fig. 1 shows a configuration of the outdoor unit.

The air conditioner (10) is provided with a plurality of compressors (110, 112), an oil separator (110, 120) disposed at an outlet side of the plurality of compressors (110, 120) for separating oil from refrigerant discharged from the plurality of compressors 120, 122).

The plurality of compressors 110 and 112 include a first compressor 110 and a second compressor 112 connected in parallel. Discharge temperature sensors 114 for sensing the temperature of the compressed refrigerant may be provided at the outlet sides of the first compressor 110 and the second compressor 112, respectively.

The oil separators 120 and 122 include a first oil separator 120 disposed at an outlet side of the first compressor 110 and a second oil separator 122 disposed at an outlet side of the second compressor 112 ).

The air conditioner 10 includes a recovery flow path 116 for recovering oil from the oil separators 120 and 122 to the compressors 110 and 112. The recovery flow path 116 extends from the respective outlet sides of the first and second oil separators 120 and is connected to the inlet side piping of the first and second compressors 110 and 112. The recovery passage 116 may be provided with a dryer 127 and a capillary 128.

A high pressure sensor 125 for sensing a discharge high pressure of the refrigerant discharged from the compressors 110 and 112 and a refrigerant passing through the high pressure sensor 125 are connected to the outdoor heat exchanger 200 or indoor unit The flow switching unit 130 is provided. For example, the flow switching unit 130 may include a four-way valve.

When the air conditioner performs the cooling operation, the refrigerant flows into the outdoor heat exchanger (200) from the flow switching unit (130). On the other hand, when the air conditioner performs the heating operation, the refrigerant flows from the flow switching unit 130 to the indoor heat exchanger side of the indoor unit (not shown).

When the air conditioner is in the cooling operation mode, the refrigerant condensed in the outdoor heat exchanger 200 passes through the main expansion valve 260 (the electronic expansion valve), and the main expansion valve 260 is fully opened, The pressure reducing action is not performed. That is, the main expansion valve 260 may be installed on the outlet side of the outdoor heat exchanger 200 on the basis of cooling operation.

The refrigerant passing through the main expansion valve (260) passes through the heat sink (265). The heat dissipation plate 265 may be provided in an electrical unit provided with a heat generating component.

For example, the heat generating component may include an intelligent power module (IPM). The IPM is understood as a module provided with a power MOSFET for controlling electric power, a drive circuit for a power device such as an IGBT, and a protection circuit for a magnetic protection function. The condensed refrigerant is coupled to the heat sink 265 to cool the heat generating component.

The air conditioner 10 is provided with a supercooling heat exchanger 270 through which the refrigerant flowing through the heat dissipating plate 265 flows and a supercooling distributor 271 provided at the inlet side of the supercooling heat exchanger 270 for branching the refrigerant . The supercooling heat exchanger 270 functions as an intermediate heat exchanger in which the first refrigerant circulating through the system and the refrigerant (second refrigerant) of a part of the first refrigerant are branched and then heat-exchanged.

Here, the first refrigerant is a refrigerant flowing into the supercooling heat exchanger 270 through the supercooling distributor 271, and may be supercooled by the second refrigerant. On the other hand, the second refrigerant can absorb heat from the first refrigerant.

The air conditioner (10) includes a supercooling flow path (273) provided at an outlet side of the supercooling heat exchanger (270) to branch the second refrigerant from the first refrigerant. The supercooling flow path 273 is provided with a supercooling expansion device 275 for reducing the pressure of the second refrigerant. The supercooling expansion device 275 may include an EEV (Electric Expansion Valve).

The second refrigerant in the supercooling passage 273 flows into the supercooling heat exchanger 270 and is heat-exchanged with the first refrigerant, and then flows to the inlet side of the gas-liquid separator 280. The air conditioner (10) further includes a supercooling discharge temperature sensor (276) for sensing the temperature of the second refrigerant that has passed through the supercooling heat exchanger (270).

The gas-liquid separator 280 separates the gaseous refrigerant before the refrigerant is introduced into the compressors 110 and 112. The gaseous refrigerant separated by the gas-liquid separator 280 may be introduced into the compressors 110 and 112.

In the process of driving the refrigeration cycle, the evaporated refrigerant may be introduced into the gas-liquid separator 280 through the flow switching unit 130. At this time, the evaporated refrigerant passes through the supercooling heat exchanger 270 2 refrigerant and flows into the gas-liquid separator 280.

The inlet side of the gas-liquid separator 280 may be provided with a suction temperature sensor 282 for sensing the temperature of the refrigerant to be sucked into the compressors 110 and 112.

Meanwhile, the first refrigerant passing through the supercooling heat exchanger (270) may be introduced into the indoor unit through the indoor unit connecting pipe (279). The air conditioner (10) is provided with an outlet pipe (24) which is provided at an outlet side of the supercooling heat exchanger (270) and which has a liquid pipe temperature Sensor 278 is further included.

The outdoor unit (10) includes a cabinet (20) that forms an appearance and accommodates the above configurations. The cabinet 20 includes a suction port 31 through which the outside air is sucked and a discharge port 35 through which the outside air sucked through the suction port 31 is heat-exchanged. The discharge port 35 is provided with a discharge grille 37. For example, the suction port 31 is formed on the side surface of the cabinet 20, and the discharge port 35 is located on the upper surface of the cabinet 20.

The outdoor unit (10) includes a blowing fan (290) for generating an air flow from the suction port (31) toward the discharge port (35). The air blowing fan 290 is disposed on the upper portion of the cabinet 20 and may be located on the lower side of the air outlet 35.

The outdoor heat exchanger (200) is provided to be bent many times along the inner surface of the cabinet (20). The bent surface of the outdoor heat exchanger 200 may be positioned so as to correspond to the plurality of suction ports 31, respectively.

The blowing fan 290 is installed above the outdoor heat exchanger 200. Therefore, the upper portion of the outdoor heat exchanger 200 is located close to the blowing fan 290, and the lower portion thereof is located relatively far from the blowing fan 290. With this arrangement, the air flow amount passing through the upper portion of the outdoor heat exchanger 200 can be made smaller than the air flow amount passing through the lower portion.

When the blowing fan 290 is driven, the air sucked through the inlet 31 passes through the bent surfaces of the outdoor heat exchanger 200 and then flows upward, .

Hereinafter, the outdoor heat exchanger 200 and its peripheral structure will be described.

The air conditioner 10 is provided with a first inlet pipe 201a connected to one side of the outdoor heat exchanger 200 from the flow switching unit 130 and a second inlet pipe 201b connected to the main expansion pipe 201a from the other side of the outdoor heat exchanger 200, And a second inlet / outlet pipe 201b extending to the device 260 is included.

For example, the first inlet / outlet pipe 201a is connected to the upper portion of the header 205, that is, the first header 205a, and the second inlet / outlet pipe 201b is connected to the lower portion of the header 205, And may be connected to the header 205c.

During the cooling operation of the air conditioner 10, the refrigerant flows into the outdoor heat exchanger 200 through the first inlet / outlet pipe 201a and flows through the second inlet / outlet pipe 201b to the outdoor heat exchanger 200 . On the other hand, at the time of heating operation of the air conditioner 10, the refrigerant flows into the outdoor heat exchanger 200 through the second inlet / outlet pipe 201b and flows through the first heat exchanger 201a And is discharged from the apparatus 200.

As described above, the blowing fan 290 may be installed above the outdoor heat exchanger 200. The outdoor heat exchanger 200 includes three heat exchangers 200a, 200b, and 200c.

In detail, the three heat exchanging units 200a, 200b and 200c are provided with a first heat exchanging unit 200a located at the top of the outdoor heat exchanger 200 and positioned closest to the blowing fan 290, A second heat exchanger 200b located at a substantially central portion of the heat exchanger 200 and having a relatively large distance from the blower fan 290 as compared with the first heat exchanger 200 and a second heat exchanger 200b disposed at a lower portion of the outdoor heat exchanger 200 And a third heat exchanging unit 200c having a relatively larger distance from the blowing fan 290 than the second heat exchanging unit.

Each of the heat exchanging units includes a refrigerant pipe 202 having a plurality of rows and stages. For example, the refrigerant pipe 201 may include a plurality of refrigerant pipes 202 so as to form three rows in the horizontal direction and a plurality of columns in the longitudinal direction, and the refrigerant pipes 202 may be spaced apart from each other.

The plurality of refrigerant pipes 202 may be bent and extended. For example, referring to FIG. 4, the plurality of refrigerant pipes 202 may be configured to extend rearwardly of the ground and then forward again. In this case, the plurality of refrigerant pipes 202 may have a bent or curved U-shape.

Each of the heat exchange units further includes coupling plates (203a, 203b) for supporting the refrigerant pipe (202). The coupling plates 203a and 203b include a first plate 203a for supporting one side of the bent refrigerant pipe 202 and a second plate 203b for supporting the other side. The first plate 203a and the second plate 203b are elongated in the vertical direction.

The upper, middle and lower portions of the first and second coupling plates 203a and 203b constitute the first to third heat exchangers 200a, 200b and 200c, respectively.

Each of the heat exchanging units may further include a return pipe 204 coupled to an end of the plurality of refrigerant pipes 202 and guiding the refrigerant flowing in one refrigerant pipe 202 to another refrigerant pipe 202. The return pipe 204 is provided with a plurality of return pipes 204 and is coupled to one side of the first plate 203a and the second plate 203b.

The outdoor heat exchanger (200) further includes a header (205) forming a space for the refrigerant to flow. The header 205 branches or introduces the refrigerant into the plurality of refrigerant pipes 202 depending on the cooling or heating operation of the air conditioner 10, And may be configured to join the refrigerant. The header 205 is elongated in the vertical direction corresponding to the extending direction of the second plate 203b.

The header 205 includes a first header 205a, a second header 205b, and a third header 205c that are spaced apart from each other. The first to third headers 205a and 205c constitute the first to third heat exchangers 200a, 200b and 200c, respectively.

In detail, the header 205 includes a first header 205a disposed at a position corresponding to an upper portion of the first plate 203b, a second header 205b provided below the first header 205a, A second header 205b disposed at a position corresponding to a central portion of the second plate 203b and a third header 205b provided below the second header 205c and disposed at a position corresponding to a lower portion of the second plate 203b, 205c.

The air conditioner 10 includes a first connection pipe 206a connecting the first header 205a and the second header 205b. That is, the first connection pipe 206a can be understood as a pipe connecting the first heat exchange unit 200a and the second heat exchange unit 200b. For example, the first connection pipe 206a extends from a lower portion of the first header 205a to an upper portion of the second header 205b.

The air conditioner 10 further includes a check valve 240 installed in the first connection pipe 206a to guide the unidirectional flow of the refrigerant. The check valve 240 guides the refrigerant flow from the second header 205b to the first header 205a and restricts the flow of refrigerant from the first header 205a to the second header 205b can do.

The air conditioner 10 includes a second connection pipe 206b connecting the second header 205b and the third header 205c. That is, the second connection pipe 206b can be understood as a pipe connecting the second heat exchange unit 200b and the third heat exchange unit 200c. For example, the second connection pipe 206b extends from the lower portion of the second header 205b to the upper portion of the third header 205c.

In each of the heat exchange units, a plurality of refrigerant inflow pipes (207) extend. The plurality of refrigerant inflow pipes 207 may extend from the first to third headers 205a, 205b, and 205c toward the second plate 203b, respectively. In other words, the plurality of refrigerant inlet pipes 207 extend from the header 205 and are connected to the refrigerant pipe 202 supported by the second plate 203b. The plurality of refrigerant inflow pipes 207 may be spaced apart from each other in the vertical direction.

The refrigerant in the first header 205a may be introduced into the refrigerant pipe 202 of the first heat exchanging part 200a through the plurality of refrigerant inflow pipes 207 during the cooling operation of the air conditioner 10. [ have. The refrigerant in the refrigerant pipe 202 of the second heat exchanging part 200b may be introduced into the second header 205b through the plurality of refrigerant inflow pipes 207. [ The refrigerant in the third header 205c may be introduced into the refrigerant pipe 202 of the third heat exchanging part 200c through the plurality of refrigerant inflow pipes 207. [

On the other hand, during the heating operation of the air conditioner 10, the refrigerant in the refrigerant pipe 202 flows into the first to third headers 205a, 205b and 205c through the refrigerant inflow pipe 207 .

The first distribution pipe 211 branching from the second inlet / outlet pipe 201b to the plurality of refrigerant pipes 202 of the outdoor heat exchanger 200, And a second distribution pipe 221 is included. The first distribution pipe 211 and the second distribution pipe 221 may be branched at the first branch portion 231.

The air conditioner 10 includes a first valve unit 215 installed in the first distribution pipe 211 and capable of controlling the amount of refrigerant flowing through the first distribution pipe 211, And a second valve device 225 installed in the second distribution pipe 221 and capable of controlling the amount of refrigerant flowing through the second distribution pipe 221.

The first valve device 215 and the second valve device 225 may include an electronic expansion valve capable of controlling opening degree. The amount of refrigerant flowing into the first distribution pipe 211 and the second distribution pipe 215 may be increased or decreased according to the opening degree of the first valve device 215 or the second valve device 225.

The air conditioner 10 includes a first branch tube 211a branched from the first distribution pipe 211 and a second branch tube 211b branched from the first distribution pipe 211. The first branch tube 211a and the second branch tube 211b may be branched at the second branch 232.

The air conditioner 10 further includes a first distributor 209a installed in the first branch tube 211a and a second distributor 209b installed in the second branch tube 211b. The refrigerant flowing in the first branch tube 211a is distributed to a plurality of paths while passing through the first distributor 209a and the refrigerant flowing in the second branch tube 211b flows into the second distributor 209b, And is distributed to a plurality of routes.

The air conditioner 10 is further provided with a third distributor 209c installed in each path distributed by the first distributor 209a and a fourth distributor 209c installed in each path distributed by the second distributor 209b, 209d.

The air conditioner 10 is further provided with a plurality of first capillary tubes 208a coupled to the outlet of the third distributor 209c and a plurality of second capillary tubes 208b coupled to the outlet of the fourth distributor 209d. And a second capillary tube 208b of the second capillary tube 208b. The first capillary tube 208a is understood as a constitution of the first heat exchanging part 200a and connected to the refrigerant pipe 202 provided in the first heat exchanging part 200a to supply the refrigerant.

During the heating operation, the refrigerant flowing through the first branch tube 211a passes through the first distributor 209a and the third distributor 209c, and is then distributed to the plurality of first capillary tubes 208a , And flows to the first heat exchanging part (200a).

On the other hand, the refrigerant flowing through the second branch pipe 211b passes through the second distributor 209b and the fourth distributor 209d and is distributed to the plurality of second capillary tubes 208a, And flows to the second heat exchanger 200b.

In summary, refrigerant branched from the first branch portion 231 and flowing to the first distribution pipe 211 can be heat-exchanged by flowing the refrigerant into the first and second heat exchange portions 200a and 200b. The first valve device 215 regulates the amount of refrigerant flowing to the first and second heat exchangers 200a and 200b.

The multi-stage distribution of the refrigerant can be performed by the installation structure of the first and third distributors 209a and 209c and the second and fourth distributors 209b and 209d. Accordingly, the flow path of the refrigerant is increased, The heat exchange efficiency can be improved during operation.

The air conditioner 10 includes a fifth distributor 210a installed in the second distributor pipe 221 for dividing refrigerant into a plurality of paths and a second distributor 210b installed in each path branched from the fifth distributor 210a And a sixth distributor 210b that divides the refrigerant into a plurality of paths.

The air conditioner 10 further includes a plurality of third capillary tubes 208c coupled to the outlet of the sixth distributor 210b. The third capillary tube 208c is understood as a constitution of the third heat exchanging part 200c and connected to the refrigerant pipe 202 provided in the third heat exchanging part 200c to supply the refrigerant.

The refrigerant branched from the first branched portion 231 and flowing through the second distribution pipe 221 flows through the fifth distributor 210a and the sixth distributor 210b, Is distributed to the capillary tube 208c, and flows to the third heat exchanging part 200c.

The heat exchanging unit further includes a branch connecting pipe 208c connecting the plurality of first to third capillary tubes 208a, 208b, and 208c to the refrigerant pipe 202. The branch connecting pipe 208c divides the refrigerant flowing through the first to third capillary tubes 208a, 208b and 208c in two directions and branches the refrigerant into the one refrigerant pipe 202 and the other refrigerant pipe 202, can do. In one example, the branch connector 208c may have a Y shape to have one inlet and two outlets. A plurality of branch connection pipes 208c may be provided corresponding to the number of the first to third capillary tubes 208a, 208b, and 208c.

On the other hand, the number of the branched refrigerant channels may be increased toward the upper portion of the outdoor heat exchanger 200, or the length of the refrigerant channel may be increased. As described above, since the blowing fan 290 is disposed on the upper side of the outdoor heat exchanger 200, the first heat exchanging unit 200a among the first to third heat exchanging units 200a, 200b, The amount of refrigerant flowing through the first heat exchanging unit 200a needs to be the largest.

The first branch portion 231 includes first and second heat exchange portions 200a and 200b that require a relatively large amount of refrigerant to flow and a third heat exchange portion 200c that requires a relatively small amount of refrigerant to flow. And the valve devices 215 and 225 are provided in the respective flow paths to easily adjust the refrigerant flow amount.

The second branch portion 232 branches the refrigerant to the first heat exchanging portion 200a and the second heat exchanging portion 200b and the number of the refrigerant flow paths toward the first heat exchanging portion 200a 2 heat exchanging portion 200b.

For example, as shown in FIG. 4, four flow paths are branched from the first distributor 209a, three flow paths are branched from the third distributor 209c, and the first heat exchanging portion 200a A total of 12 refrigerant flow paths may be formed. That is, four third distributors 209c may be installed.

On the other hand, three flow paths are branched from the second distributor 209b, three flow paths are branched from the fourth distributor 209d, and a total of nine refrigerant flow paths to the second heat exchanging portion 200b . That is, three fourth distributors 209d may be installed.

Two flow paths are branched from the fifth distributor 210a, three flow paths are branched from each other in the sixth distributor 210b, and a total of six refrigerant flow paths are introduced into the third heat exchanging portion 200c . That is, two sixth distributors 210b may be installed.

In this way, the number of the different refrigerant flow paths can be divided in the first branch portion 231, and the number of the different refrigerant flow paths can be branched in the second branch portion 232. At this time, the branched channels are formed so that the upper side is larger than the lower side. As a result, with this configuration, more refrigerant flow amount and heat exchange amount can be brought to the upper side of the outdoor heat exchanger 200.

Hereinafter, the refrigerant flow in the air conditioner 10 during the heating operation and the cooling operation of the air conditioner will be described with reference to Figs. 5 and 6. Fig.

FIG. 5 is a view showing a state in which the air conditioner according to the embodiment of the present invention is in a cooling operation, and FIG. 6 is a view showing a state in which the air conditioner is in a heating operation according to an embodiment of the present invention. Fig.

Referring to FIG. 5, when the air conditioner performs the cooling operation, the high-temperature and high-pressure refrigerant compressed by the first and second compressors 110 and 112 flows through the first and second oil separators 120 and 122, The separated and separated oil returns to the first and second compressors 110 and 112 through the recovery flow path 116. The oil separated refrigerant flows to the first inlet / outlet pipe 201a through the flow switching unit 130 and flows through the first header 205a to the first heat exchanger 200a of the outdoor heat exchanger 200 200a.

The first to third heat exchanging units 200a, 200b and 200c are connected in series and the refrigerant flows in turn through the first heat exchanging unit 200a, the second heat exchanging unit 200b, and the third heat exchanging unit 200c .

In detail, the refrigerant introduced into the first header 205a flows into the refrigerant pipe 202 supported by the second coupling plate 203b through the refrigerant inlet pipe 207. At this time, the pipe connected to the first header 205a and into which the refrigerant flows may be referred to as a " refrigerant pipe of the first heat exchanging portion "or a" first refrigerant pipe ". The refrigerant flows to the refrigerant pipe 202 supported by the first coupling plate 203a, and is heat-exchanged with the outside air. At this time, the refrigerant in the first header 205a is restricted from flowing into the second header 205b, that is, the second heat exchanger 200b by the check valve 240. [

The refrigerant that has been heat-exchanged while flowing through the first refrigerant pipe 202 flows through the first capillary tube 208a, the third distributor 209c, the first distributor 209a, and the first branch tube 211a in order do. That is, the refrigerant flows into the first heat exchanging part 200a through the first header 205a and can be discharged from the first heat exchanging part 200a through the first capillary 208a.

The first valve device 215 is closed. Accordingly, the refrigerant in the first branch pipe 211a is restricted from flowing to the first distribution pipe 211, and can flow into the second branch pipe 211b.

The refrigerant in the second branch tube 211b flows into the second heat exchanger 200b through the second distributor 209b, the fourth distributor 209d and the plurality of third capillary tubes 208c, do. The refrigerant flows into the refrigerant pipe 202 supported by the first coupling plate 203a and flows to the refrigerant pipe 202 supported by the second coupling plate 203b while exchanging heat with the outside air.

The refrigerant flows into the second header 205b through the refrigerant inlet pipe 207. [ At this time, the refrigerant pipe 202 connected to the second header 205b may be referred to as a " refrigerant pipe of the first heat exchanger "or a" second refrigerant pipe ".

That is, the refrigerant flows into the second heat exchanger 200b through the plurality of third capillary tubes 208c and is discharged from the second heat exchanger 200b through the second header 205b .

The refrigerant in the second header 205b flows into the third header 205c of the third heat exchanging unit 200c through the second connecting pipe 206b. The refrigerant in the third header 205c flows into the refrigerant pipe 202 supported by the second coupling plate 203b through the refrigerant inlet pipe 207. [ At this time, the refrigerant pipe 202 connected to the third header 205c may be referred to as a " refrigerant pipe of the third heat exchanger "or a" third refrigerant pipe ".

The refrigerant flows to the refrigerant pipe 202 supported by the first coupling plate 203a and is heat-exchanged with the outside air. The third capillary tube 208c, the sixth distributor 210b, And flows through the second distribution pipe 221 through the first distribution pipe 210a.

The second valve device 225 is opened and the refrigerant of the second distribution pipe 221 is discharged to the second inlet / outlet pipe 201b.

In this way, during the cooling operation of the air conditioner 10, the refrigerant can be condensed while sequentially passing through the first to third heat exchanging units 200a, 200b and 200c connected in series. That is, the refrigerant flowing into the outdoor heat exchanger 200 is firstly condensed in the refrigerant pipe 202 connected to the first header 205a side and the refrigerant pipe 202 connected to the second header 205b side, And is condensed in the refrigerant piping 202 connected to the third header 205c side so that the flow path of the refrigerant is lengthened while the number of paths branched by the refrigerant piping 202 is reduced . As a result, it is possible to increase the flow rate of the refrigerant, thereby reducing the condensation pressure and improving the condensation efficiency.

Next, referring to FIG. 6, when the air conditioner performs the heating operation, the high-temperature and high-pressure refrigerant compressed by the first and second compressors 110 and 112 flows through the first and second oil separators 120 and 122, The separated and separated oil is returned to the first and second compressors 110 and 112 through the recovery flow path 116. The refrigerant from which the oil is separated flows through the flow switching unit 130 to the indoor unit side.

The refrigerant flowing into the indoor unit is condensed in the indoor heat exchanger, and the condensed refrigerant flows into the supercooling heat exchanger (270) through the indoor unit connecting pipe (279). At this time, a part of the refrigerant is branched into the supercooling flow path 273, is depressurized in the supercooling expansion device 275, and can be introduced into the supercooling heat exchanger 270.

Therefore, the condensed refrigerant and the refrigerant flowing through the supercooling flow path 273 are heat-exchanged with each other, so that the condensed refrigerant can be supercooled. The supercooling refrigerant passing through the supercooling heat exchanger 270 may be decompressed by the main expansion valve 260 while cooling the exothermic component of the electric unit through the heat dissipation plate 265.

The first to third heat exchanging units 200a, 200b and 200c are connected in parallel, and the refrigerant may be branched into the first to third heat exchanging units 200a, 200b and 200c.

In detail, the refrigerant decompressed in the main expansion valve 260 is branched from the first branched portion 231 to the first distribution pipe 211 and the second distribution pipe 221. At this time, the first valve device 215 and the second valve device 225 are opened, and the refrigerant flow path arranged in the first and second heat exchanging parts 200a and 200b is connected to the third heat exchanging part 200c The amount of the refrigerant flowing into the first distribution pipe 211 may be greater than the amount of the refrigerant flowing into the second distribution pipe 221.

The amount of the refrigerant flowing through the first distribution pipe 211 and the second distribution pipe 221 can be adjusted according to the opening degree of the first valve device 215 or the second valve device 225. For example, to increase the amount of refrigerant flowing into the first distribution pipe 211, the opening of the second valve device 225 may be reduced.

The refrigerant flowing through the first distribution pipe 211 flows from the second branch 232 to the first branch pipe 211a and the second branch pipe 211b via the first valve device 215, ≪ / RTI >

The refrigerant in the first branch pipe 211a is divided into a plurality of paths while passing through the first distributor 209a and the respective paths are branched into a plurality of paths again through the third distributor 209c, And flows into the first heat exchanging part 200a through the plurality of first capillary tubes 208a.

The refrigerant in the second branch pipe 211b is branched into a plurality of paths through the second distributor 209b and the refrigerant in each path passes through the fourth distributor 209d and passes through a plurality of paths And flows into the second heat exchanger 200b through the plurality of second capillary tubes 208b.

At this time, as described above, the number or size of the refrigerant flows into the first heat exchanging part 200a is larger than the number or size of the refrigerant flowing into the second heat exchanging part 200b, A large amount of refrigerant can be introduced into the first heat exchanging unit 200a.

The refrigerant flowing into the first heat exchanging part 200a and the second heat exchanging part 200b flows to the refrigerant pipe 202 supported by the second coupling plate 203b of each heat exchanging part and is heat-exchanged with the outside air, Flows into the first header 205a of the first heat exchanging unit 200a and the two header 205b of the second heat exchanging unit 200b through the refrigerant inflow pipe 207. [

That is, the refrigerant flowing into the first heat exchanging part 200a through the plurality of first capillary tubes 208a is discharged from the first heat exchanging part 200a through the first header 205a.

The refrigerant flowing into the second heat exchanging part 200b through the plurality of second capillary tubes 208b is discharged from the second heat exchanging part 200b through the second header 205b.

The refrigerant discharged from the second heat exchange unit 200b flows into the first header 205a through the first connection pipe 206a. As a result, the refrigerant circulated through the second heat exchanging unit 200b is combined with the refrigerant circulating through the first heat exchanging unit 200a in the first header 205a.

The refrigerant flowing from the first branched portion 231 to the second distribution pipe 221 passes through the second valve device 225 and passes through the fifth distributor 210a, do. The refrigerant in each path is branched into a plurality of paths again through the sixth distributor 210b and flows into the third heat exchanger 200c through the plurality of third capillary tubes 208c .

The refrigerant flowing into the third heat exchanging part 200c flows to the refrigerant pipe 202 supported by the second coupling plate 203b and is heat-exchanged with the outside air, And then flows into the third header 205a of the heat exchanging unit 200c.

That is, the refrigerant flowing into the third heat exchanging part 200c through the plurality of third capillary tubes 208c is discharged from the third heat exchanging part 200c through the third header 205c.

The refrigerant discharged from the third heat exchanging part 200c flows into the second header 205b through the second connecting pipe 206b. As a result, the refrigerant circulated through the third heat exchanging unit 200c is combined with the refrigerant circulating through the second heat exchanging unit 200b in the second header 205b.

The refrigerant in the second header 205b flows into the first header 205a via the first connection pipe 206a and the check valve 240 as described above. The refrigerant heat-exchanged in the first to third heat exchangers 200a, 200b and 200c is collected in the first header 205a.

The refrigerant in the first header 205a may be discharged to the outdoor heat exchanger 200 through the first inlet / outlet pipe 201a. The refrigerant discharged from the heat exchanger 200 flows into the gas-liquid separator 280 via the flow switching unit 130 and the separated gaseous refrigerant can be sucked into the first and second compressors 110 and 112. This cycle can be repeated.

In this way, during the heating operation of the air conditioner 10, the refrigerant can be divided into multiple stages through the first to sixth distributors 209a, 209b, 209c, 209d, 210a, 210b and branched into a plurality of refrigerant paths The branched refrigerant flows into the plurality of refrigerant pipes 202 and can be heat-exchanged with the outside air.

Therefore, the refrigerant flow path in the outdoor heat exchanger 200 is shortened, while the number of paths branched to the outdoor heat exchanger 200 is increased. As a result, it is possible to reduce the pressure loss of the refrigerant and thereby prevent the evaporation pressure from being lowered, thereby improving the evaporation efficiency.

10: air conditioner 110, 112: compressor
125: high-pressure sensor 130:
200: outdoor heat exchanger 201a: first inlet / outlet pipe
201b: second inlet / outlet pipe 202: refrigerant pipe
203a: first coupling plate 203b: second coupling plate
205a: first header 205b: second header
205c: third header 206a: first connection pipe
206b: second connection pipe 207: refrigerant inlet pipe
208a: first capillary tube 208b: second capillary tube
209a: First distributor 209b: Second distributor
209c: third distributor 209d: fourth distributor
210a: fifth distributor 210b: sixth distributor
211: first distribution pipe 215: first valve device
221: second distribution pipe 225: second valve device
240: Check valve 260: Main expansion valve
265: heat sink 270: supercooling heat exchanger
280: gas-liquid separator

Claims (18)

compressor;
A flow switching unit which is disposed at an outlet side of the compressor and switches the flow direction of the refrigerant according to cooling or heating operation; And
And an outdoor heat exchanger connected to the flow switching unit,
In the outdoor heat exchanger,
A first to a third heat exchanging unit having refrigerant pipes through which the refrigerant flows, the first to third heat exchanging units being connected in parallel during heating operation and connected in series during cooling operation;
A first branch portion for branching the refrigerant to a first distribution pipe facing the first heat exchanging portion and a second distribution pipe facing the third heat exchanging portion;
A second branching part for branching the refrigerant branched from the first branching part to a first branching tube directed to the first heat exchanging part and a second branching tube directed to the second heat exchanging part; And
And a first valve device installed in the first distribution pipe,
During the heating operation, the first valve device is opened, a part of the refrigerant passing through the first branch portion flows to the second distribution pipe, and the remaining refrigerant passes through the first valve device, In addition,
In the cooling operation, the first valve device is closed, refrigerant having passed through the first heat exchanging part flows into the second branch pipe from the first branch pipe, and flows into the third heat exchanging part via the second heat exchanging part The air conditioner comprising: The method according to claim 1,
Further comprising a blowing fan installed above the outdoor heat exchanger for blowing outside air,
Wherein the first heat exchanging portion forms an upper portion of the outdoor heat exchanging portion, the second heat exchanging portion forms an intermediate portion of the outdoor heat exchanger, and the third heat exchanging portion forms a lower portion of the outdoor heat exchanger. 3. The method of claim 2,
The number of refrigerant flow passages provided in the first heat exchanging portion or the second heat exchanging portion may be,
Wherein the number of the refrigerant channels in the third heat exchanging unit is greater than the number of refrigerant channels in the third heat exchanging unit. The method of claim 3,
The number of the refrigerant flow passages provided in the first heat exchanging portion may be,
Wherein the number of the refrigerant channels in the second heat exchanging unit is greater than the number of refrigerant channels in the second heat exchanging unit. The method according to claim 1,
The refrigerant flowing through the first branch pipe, the refrigerant flowing through the second branch pipe, or the refrigerant flowing through the second distribution pipe,
Wherein the heat exchanger is divided into a plurality of stages and is introduced into the first to third heat exchangers. 6. The method of claim 5,
A first distributor installed in the first branch tube for branching the refrigerant passage;
A second distributor provided at an outlet side of the first distributor for re-branching the branched refrigerant channels; And
And a first capillary installed at an outlet side of the second distributor and guiding the refrigerant passing through the second distributor to the first heat exchanger. 6. The method of claim 5,
A second distributor installed in the second branch pipe for branching the refrigerant passage;
A fourth distributor provided at an outlet side of the second distributor for re-branching each refrigerant channel branched from the second distributor; And
And a second capillary installed at an outlet side of the fourth distributor and guiding the refrigerant passing through the fourth distributor to the second heat exchanger. 6. The method of claim 5,
A fifth distributor installed in the second distribution pipe for branching the refrigerant passage;
A sixth distributor installed on an outlet side of the fifth distributor for re-branching each refrigerant channel branched by the fifth distributor; And
And a third capillary installed at the outlet side of the sixth distributor and guiding the refrigerant passing through the sixth distributor to the third heat exchanger. The method according to claim 1,
Further comprising a second valve device installed in the second distribution pipe,
Wherein the first valve device or the second valve device includes an electronic expansion valve capable of adjusting opening degree. The method according to claim 1,
A first header provided in the first heat exchanging unit;
A second header provided in the second heat exchanging unit and spaced apart from the first header; And
Further comprising a third header disposed in the third heat exchanging unit and spaced apart from the second header. 11. The method of claim 10,
When the first to third heat exchange units are connected in parallel during the heating operation,
The refrigerant flowing into the third heat exchanger is discharged from the third header and flows into the second header,
The refrigerant introduced into the second heat exchanger is discharged from the second header and flows into the first header,
And the refrigerant in the first header is discharged from the outdoor heat exchanger. 11. The method of claim 10,
When the first to third heat exchangers are connected in series during the cooling operation,
The refrigerant flowing into the first heat exchanging unit through the first header flows into the second heat exchanging unit via the first and second branch pipes,
The refrigerant introduced into the second heat exchanger is discharged from the second header, flows into the third heat exchanger through the third header,
And the refrigerant of the third heat exchanger is discharged from the outdoor heat exchanger through the second distribution pipe. 11. The method of claim 10,
A first connection pipe connecting the first header and the second header and having a check valve installed therein; And
And a second connection pipe connecting the second header and the third header,
Wherein the check valve limits the flow of refrigerant from the first header to the second header. The method according to claim 1,
A first coupling plate provided on each of the first to third heat exchanging units for supporting one side of the refrigerant pipe; And
And a second coupling plate for supporting the other side of the refrigerant pipe. 15. The method of claim 14,
Wherein the first to third headers extend in one direction corresponding to the longitudinal direction of the second engagement plate and are connected to the second engagement plate. compressor;
A flow switching unit which is disposed at an outlet side of the compressor and switches the flow direction of the refrigerant according to cooling or heating operation;
An outdoor heat exchanger connected to the flow switching unit; And
And a blowing fan installed above the outdoor heat exchanger,
In the outdoor heat exchanger,
A first to a third heat exchanging unit having refrigerant pipes through which the refrigerant flows, the first to third heat exchanging units being connected in parallel during heating operation and connected in series during cooling operation;
A first branch portion for branching the refrigerant to a first distribution pipe facing the first heat exchanging portion and a second distribution pipe facing the third heat exchanging portion;
A second branching part for branching the refrigerant branched from the first branching part to a first branching tube directed to the first heat exchanging part and a second branching tube directed to the second heat exchanging part;
A first distributor installed in the first branch tube for branching the refrigerant passage; And
A second distributor installed in the second branch pipe for branching the refrigerant passage; / RTI >
Wherein the first heat exchanger is located on the upper side of the outdoor heat exchanger, the second heat exchanger is on the lower side of the first heat exchanger, and the third heat exchanger is on the lower side of the second heat exchanger,
Wherein the number of refrigerant channels branched by the first distributor is greater than the number of refrigerant channels branched by the second distributor.
17. The method of claim 16,
A first valve device installed in the first distribution pipe; And
Further comprising a second valve device installed in the second distribution pipe,
During the heating operation, the first and second valve devices are opened, and some refrigerant passing through the first branch portion flows to the second distribution pipe, and the remaining refrigerant passes through the first valve device, 2 minutes branch pipe,
Wherein the first valve device is closed and the second valve device is opened so that the refrigerant having passed through the first heat exchanging part flows from the first branching tube to the second heat exchanging part via the second branching tube, And is discharged through the third heat exchanger. 17. The method of claim 16,
A capillary tube disposed at one side of the first to third heat exchanging units; And
And a header disposed on the other side of the first to third heat exchanging units,
Wherein the refrigerant flows into the first to third heat exchanging parts through the capillary tube during the heating operation and is discharged from the first to third heat exchanging parts through the header.
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CN112539481A (en) * 2019-09-20 2021-03-23 青岛海尔空调器有限总公司 Outdoor unit condenser, outdoor unit and variable frequency air conditioner
CN111637583B (en) * 2020-05-25 2022-06-14 宁波奥克斯电气股份有限公司 Condenser flow path structure, control method and air conditioner
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