KR101867858B1 - Air conditioner - Google Patents

Abstract

The present invention relates to an air conditioner for removing frost generated in an outdoor heat exchanger. The air conditioner according to the present invention comprises: a compressor; an indoor heat exchanger; a first outdoor heat exchanger; a second outdoor heat exchanger; a first transfer unit for guiding a refrigerant compressed in the compressor during a heating operation to the indoor heat exchanger and guiding the refrigerant compressed in the compressor during a time of the first outdoor heat exchanger to a first heat exchanger; and a second transfer unit for guiding the refrigerant compressed by the compressor at the compressor for the second outdoor heat exchanger to a second outdoor heat exchanger. Therefore, the present invention can perform defrosting of the first outdoor heat exchanger and the second outdoor heat exchanger together or individually.

Description

Air conditioner

The present invention relates to an air conditioner, and more particularly, to an air conditioner for removing frost generated in an outdoor heat exchanger.

Background Art [0002] Generally, an air conditioner is a device for cooling or heating a room using a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. A radiator for cooling the room, and a radiator for heating the room. And a cooling / heating air conditioner for cooling or heating the room.

And a switching unit for changing the flow path of the refrigerant compressed by the compressor in accordance with the cooling operation and the heating operation in the case where the air conditioner is composed of the air conditioner and the air conditioner.

The refrigerant compressed in the compressor during the cooling operation flows through the switching portion to the outdoor heat exchanger, and the outdoor heat exchanger serves as the condenser. The refrigerant condensed in the outdoor heat exchanger is expanded in the expansion valve, and then flows into the indoor heat exchanger. At this time, the indoor heat exchanger functions as an evaporator, and the refrigerant evaporated in the indoor heat exchanger flows into the compressor again through the switching portion.

The refrigerant compressed in the compressor during the heating operation flows through the switching portion to the indoor heat exchanger, and the indoor heat exchanger serves as the condenser. The refrigerant condensed in the indoor heat exchanger is expanded in the expansion valve, and then flows into the outdoor heat exchanger. At this time, the outdoor heat exchanger acts as an evaporator, and the refrigerant evaporated in the outdoor heat exchanger passes through the switching portion and flows into the compressor.

The air conditioner performs a defrost operation in which the refrigerant compressed in the compressor flows to the outdoor heat exchanger in order to remove the frost generated in the outdoor heat exchanger during the heating operation. However, when the defrosting operation is performed, there is a problem that the compressed refrigerant does not flow into the indoor heat exchanger and thus the user can not provide the heating.

Published patent application No. 10-2012-0114997 Published Patent Application No. 10-2010-0088378

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner that minimizes heating interruption and removes frost from the outdoor heat exchanger.

Another object of the present invention is to provide an air conditioner that minimizes the time required to remove frost from the outdoor heat exchanger.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an air conditioner according to the present invention comprises a compressor, an indoor heat exchanger, a first outdoor heat exchanger, a second outdoor heat exchanger, and a second outdoor heat exchanger for guiding the refrigerant compressed in the compressor during the heating operation to the indoor heat exchanger, And a second switching unit for guiding the refrigerant compressed by the compressor for the second outdoor heat exchanger to the second outdoor heat exchanger, wherein the first switching unit guides the refrigerant compressed by the compressor for the outdoor heat exchanger to the first heat exchanger So that defrosting of the first outdoor heat exchanger and the second outdoor heat exchanger can be performed together or individually.

The first switching unit can guide the refrigerant vaporized in the first outdoor heat exchanger to the compressor during the heating operation and can guide the refrigerant evaporated in the indoor heat exchanger to the compressor when the first outdoor heat exchanger is defrosted.

The second switching unit may guide the refrigerant evaporated in the second outdoor heat exchanger to the compressor during the heating operation.

And the refrigerant condensed in the second outdoor heat exchanger at the time of the second outdoor heat exchanger can flow into the first outdoor heat exchanger.

When the defrosting condition is satisfied during the heating operation, the control unit for controlling the first switching unit and the second switching unit switches the first switching unit and the second switching unit to perform the entire defrosting operation, Operation can be performed.

According to an aspect of the present invention, there is provided an air conditioner comprising: a compressor; an indoor heat exchanger; a first outdoor heat exchanger; a second outdoor heat exchanger; and an indoor heat exchanger connected to a discharge end of the compressor, And a second switching unit that connects the discharge end of the compressor to the second outdoor heat exchanger or connects the second outdoor heat exchanger to the suction end of the compressor, wherein the compressor is connected to the first outdoor heat exchanger and the second outdoor heat exchanger, To the outdoor heat exchanger at the same time or individually.

The control unit performs the heating operation, performs the entire defrosting operation by switching the first blowing unit and the second switching unit, performs the lower defrosting operation by switching only the first blowing unit, switches only the second blowing unit, Operation can be performed.

The details of other embodiments are included in the detailed description and drawings.

The air conditioner of the present invention has one or more of the following effects.

First, there is an advantage in that the defrosting of the first outdoor heat exchanger and the second outdoor heat exchanger can be performed together or individually by arranging the two switching portions relatively simple structure and control.

Second, the defrosting of the first outdoor heat exchanger and the second outdoor heat exchanger is performed, and then the defrosting of the second outdoor heat exchanger is performed, so that defrosting of the second outdoor heat exchanger having a large amount of frost can be sufficiently performed. In addition, indoor heating is performed during the lower defrost operation in which only the defrosting operation is performed on the second outdoor heat exchanger, thereby minimizing the heating interruption.

Third, during the heating operation, all of the two switching units are switched to perform the entire defrosting operation, and then the two switching units are switched one by one to return to the heating operation, thereby stabilizing the cycle, minimizing the heating interruption and minimizing the total defrosting time There are also advantages.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.
2 is a block diagram of an air conditioner according to an embodiment of the present invention.
3 is a view illustrating a control method for defrosting an air conditioner according to an embodiment of the present invention.
FIG. 4 is a view illustrating a refrigerant flow in the entire defrosting operation of an air conditioner according to an embodiment of the present invention.
FIG. 5 is a view illustrating a refrigerant flow in a lower defrosting operation of an air conditioner according to an embodiment of the present invention. Referring to FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining an air conditioner according to embodiments of the present invention.

FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a block diagram of an air conditioner according to an embodiment of the present invention.

The air conditioner to be described later performs the heating operation, the total defrosting operation and the lower defrosting operation, and it is also possible to perform the upper defrosting operation and the cooling operation. The heating operation is an operation of heating the room air by condensing the refrigerant in the indoor heat exchanger 120, and the cooling operation is an operation of evaporating the refrigerant in the indoor heat exchanger 120 to cool the room air. The total defrosting operation is performed in such a manner that the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 for introducing the high-temperature refrigerant compressed in the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132, And the lower defrosting operation is for the defrosting of the second outdoor heat exchanger 132 which inflows the high-temperature refrigerant compressed in the second outdoor heat exchanger 132, and the upper defrosting operation is performed for the first outdoor heat exchanger 131 To the first outdoor heat exchanger (131) through which the high temperature refrigerant flows.

A first outdoor heat exchanger (131) installed outside the room for exchanging heat between the outdoor air and the refrigerant; a second outdoor heat exchanger (131) installed outside the outdoor unit for exchanging heat between the outdoor air and the refrigerant; A second outdoor heat exchanger 132 installed outside the outdoor unit for exchanging heat between the outdoor air and the refrigerant and a second outdoor heat exchanger 132 for connecting the outlet end 112 of the compressor 110 to the indoor heat exchanger 120 or the indoor heat exchanger 120 to the compressor And a second outdoor heat exchanger 132 connected to the discharge end 112 of the compressor 110 and the second outdoor heat exchanger 132. The second outdoor heat exchanger 132 is connected to the suction end 111 of the compressor 110, An outdoor expansion valve 150 for expanding the refrigerant condensed in the indoor heat exchanger 120, a first outdoor heat exchanger 131, and a second outdoor heat exchanger 132. [ And an indoor expansion valve (140) for expanding the refrigerant condensed in the second outdoor heat exchanger (132).

The compressor 110 compresses the introduced low-temperature low-pressure refrigerant into high-temperature high-pressure refrigerant. The compressor 110 may have various structures, and may be a reciprocating compressor using a cylinder and a piston, or a scroll compressor using a revolving scroll and a fixed scroll. In this embodiment, the compressor 110 is a scroll compressor. The compressors 110 may be provided in plurality according to the embodiment.

The compressor 110 includes a suction end 111 through which the refrigerant is sucked and a discharge end 112 through which the refrigerant is discharged. The discharge end 112 of the compressor 110 is connected to the first switching portion 191 and the second switching portion 192 and the suction end 111 of the compressor 110 is connected to the first switching portion 191 and the second switching portion 192. [ And is connected to the 2-switch portion 192. A gas-liquid separator 115 is disposed between the suction end 111 of the compressor 110 and the first switching portion 191 and the second switching portion 192. The gas-liquid separator 115 separates the gaseous refrigerant and the liquid-phase refrigerant from the refrigerant flowing into the suction end 111 of the compressor 110.

The first switching portion 191 is a switching valve for changing the flow path of the refrigerant. The first switching portion 191 may be implemented by various modules capable of connecting four flow paths, and in the present embodiment, it is a four-way valve for switching four flow paths.

The first valve portion 191 is connected to the suction end of the compressor 110, the indoor heat exchanger 120, the first outdoor heat exchanger 131, and the compressor 110. The first switching portion 191 connects the discharge end 112 of the compressor 110 to the indoor heat exchanger 120 and the first outdoor heat exchanger 131 is connected to the suction port of the compressor 110 (111). The first circulation unit 191 connects the discharge end 112 of the compressor 110 to the first outdoor heat exchanger 131 and the indoor heat exchanger 120 to the suction end 111 of the compressor 110 ).

During the heating operation and the lower defrost operation, the first blowing portion 191 guides the refrigerant compressed in the compressor 110 to the indoor heat exchanger 120, and the refrigerant evaporated in the first outdoor heat exchanger 131 is discharged to the compressor 110. [ . The refrigerant compressed in the compressor 110 is guided to the first outdoor heat exchanger 131 and the refrigerant evaporated in the indoor heat exchanger 120 is guided to the compressor 110 during the entire defrost operation.

The second switching portion 192 is a switching valve for changing the flow path of the refrigerant. The second switching portion 192 may be implemented by various modules capable of connecting three flow paths, and in the present embodiment, it may be a four-way valve for switching three flow paths and a three-way valve according to an embodiment.

The second switching portion 192 is connected to the suction end of the compressor 110 and the suction end of the compressor 110. The second switching portion 192 is connected to the suction end of the compressor 110 and the suction end of the second outdoor heat exchanger 132 and the compressor 110. In the heating operation, the second switching portion 192 connects the second outdoor heat exchanger 132 to the suction end 111 of the compressor 110. The second switching portion 192 connects the discharge end 112 of the compressor 110 to the second outdoor heat exchanger 132 in the entire defrost operation and the lower defrost operation.

During the heating operation, the second switching portion 192 guides the refrigerant evaporated in the second outdoor heat exchanger 132 to the compressor 110. The refrigerant compressed by the compressor 110 is guided to the second outdoor heat exchanger 132 during the entire defrost operation and the lower defrost operation.

The indoor heat exchanger (120) is installed in a room to exchange heat between indoor air and refrigerant. The indoor heat exchanger (120) condenses the refrigerant during the heating operation and the lower defrost operation and evaporates the refrigerant during the entire defrost operation. One side of the indoor heat exchanger (120) is connected to the first switching portion (191) and the other side is connected to the indoor expansion valve (140).

The opening degree of the indoor expansion valve (140) is adjusted during the entire defrosting operation to expand the refrigerant, and when the heating operation and the lower defrost operation are performed, the refrigerant is completely opened. One side of the indoor expansion valve (140) is connected to the indoor heat exchanger (120), and the other side is connected to the outdoor expansion valve (150).

The first outdoor heat exchanger (131) is installed outdoors to exchange heat between the outdoor air and the refrigerant. The first outdoor heat exchanger (131) condenses the refrigerant during the entire defrosting operation and evaporates the refrigerant during the heating operation and the lower defrost operation. One side of the first outdoor heat exchanger 131 is connected to the first switching unit 191 and the other side of the first outdoor heat exchanger 131 is connected to the outdoor expansion valve 150 and the second outdoor heat exchanger 132.

The second outdoor heat exchanger (132) is installed outdoors to exchange heat between the outdoor air and the refrigerant. The second outdoor heat exchanger (132) condenses the refrigerant during the entire defrost operation and the lower defrost operation and evaporates the refrigerant during the heating operation. One end of the second outdoor heat exchanger 132 is connected to the second switch 192 and the other end of the second outdoor heat exchanger 132 is connected to the outdoor expansion valve 150 and the first outdoor heat exchanger 131.

The outdoor fan (180) flows outdoor air so that the main first heat exchanger (131) and the second outdoor heat exchanger (132) can exchange heat with the outdoor air. The outdoor fan 180 is disposed on the first outdoor heat exchanger 131 side so that outdoor air flows through the second outdoor heat exchanger 132 to the first outdoor heat exchanger 131 and then flows through the outdoor fan 180 So that it can be discharged. The first outdoor heat exchanger 131 is disposed on the upper side of the second outdoor heat exchanger 132 and the outdoor air fan 180 is disposed on the upper side of the first outdoor heat exchanger 131 in this embodiment. The first outdoor heat exchanger 131 is disposed downstream of the second outdoor heat exchanger 132 with respect to the flow direction of the outdoor air flowing by the outdoor fan 180.

The opening degree of the outdoor expansion valve (150) is controlled during the heating operation and the lower defrost operation, and the refrigerant expands, and when the entire defrosting operation is completed, the refrigerant passes through. One side of the outdoor expansion valve (150) is connected to the indoor expansion valve (140), and the other side is connected to the first outdoor heat exchanger (131) and the second outdoor heat exchanger (132).

The outdoor fan (180) flows outdoor air so that the main first heat exchanger (131) and the second outdoor heat exchanger (132) can exchange heat with the outdoor air. The outdoor fan 180 is disposed on the first outdoor heat exchanger 131 side so that outdoor air flows through the second outdoor heat exchanger 132 to the first outdoor heat exchanger 131 and then flows through the outdoor fan 180 So that it can be discharged. The first outdoor heat exchanger 131 is disposed on the upper side of the second outdoor heat exchanger 132 and the outdoor air fan 180 is disposed on the upper side of the first outdoor heat exchanger 131 in this embodiment. The first outdoor heat exchanger 131 is disposed downstream of the second outdoor heat exchanger 132 with respect to the flow direction of the outdoor air flowing by the outdoor fan 180.

The control unit 10 controls the compressor 110, the indoor expansion valve 140, the outdoor expansion valve 150, the first switching unit 191, and the second switching unit 192 according to the operation mode. A control method of the control unit 10 according to the operation mode will be described later with reference to FIG. 3 to FIG.

Referring to FIG. 1, the refrigerant flow during the heating operation of the air conditioner according to the embodiment of the present invention will be described.

The control unit 10 controls the first switching unit 191 to connect the discharge end 112 of the compressor 110 to the indoor heat exchanger 120 and connect the first outdoor heat exchanger 131 to the compressor 110 To the suction end 111 of the suction hose. The control unit 10 controls the second switching unit 192 to connect the second outdoor heat exchanger 132 to the suction end 111 of the compressor 110. [ Further, the control unit 10 fully opens the indoor expansion valve 140 and regulates the opening degree of the outdoor expansion valve 150.

The refrigerant compressed in the compressor 110 and discharged to the discharge end 112 flows into the first switching portion 191 and flows to the indoor heat exchanger 120 through the first switching portion 191. The refrigerant flowing into the indoor heat exchanger 120 is heat-exchanged with indoor air and condensed. The refrigerant condensed in the indoor heat exchanger 120 flows to the outdoor expansion valve 150 after being passed through the indoor expansion valve 140 and expanded.

The refrigerant expanded in the outdoor expansion valve (150) is divided and flowed into the first outdoor heat exchanger (131) and the second outdoor heat exchanger (132). The refrigerant flowing into the first outdoor heat exchanger (131) is evaporated by heat exchange with the outdoor air. The refrigerant evaporated in the first outdoor heat exchanger 131 flows into the first switching portion 191 and flows to the gas-liquid separator 115 through the first switching portion 191. The refrigerant flowing into the second outdoor heat exchanger 132 is heat-exchanged with the outdoor air and evaporated. The refrigerant evaporated in the second outdoor heat exchanger 132 flows into the second switching portion 192 and flows to the gas-liquid separator 115 through the second switching portion 192.

The gaseous refrigerant separated by the gas-liquid separator 115 flows into the compressor 110 through the suction end 111 and is compressed.

FIG. 3 is a view illustrating a control method for defrosting an air conditioner according to an embodiment of the present invention. FIG. 4 is a schematic view illustrating a flow of a refrigerant in an entire defrosting operation of an air conditioner according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a refrigerant flow in a lower defrosting operation of an air conditioner according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 3, the controller 10 determines whether the defrost condition is satisfied during the heating operation (S210). The defrosting condition is a condition for determining whether or not the first outdoor heat exchanger 131 and / or the second outdoor heat exchanger 132 has generated frost. The first outdoor heat exchanger 131 and / or the second outdoor heat exchanger 132 The outdoor temperature, the operation speed of the compressor 110, the discharge superheating degree, the supercooling degree, and the like. In the present embodiment, a temperature sensor is provided to each of the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 to determine whether or not it is a frost. That is, the defrosting condition is a case where the temperatures of the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 are lower than the set temperature.

When the defrosting condition is satisfied, the control unit 10 performs the entire defrosting operation (S220). The control unit 10 controls the first switching unit 191 to connect the discharge end 112 of the compressor 110 to the first outdoor heat exchanger 131 and to connect the indoor heat exchanger 120 to the compressor 110. [ (111) of the housing (110). The control unit 10 controls the second switching unit 192 to connect the discharge end 112 of the compressor 110 to the second outdoor heat exchanger 132. The controller 10 switches both the first switching portion 191 and the second switching portion 192 when changing from the cooling operation to the total defrosting operation. At the start of the entire defrosting operation, the control unit 10 fully opens the outdoor expansion valve 150 and regulates the opening degree of the indoor expansion valve 140.

Referring to FIG. 4, the refrigerant flow in the entire defrosting operation of the air conditioner according to the embodiment of the present invention will be described.

The refrigerant compressed by the compressor 110 and discharged to the discharge end 112 flows to the first switching portion 191 and the second switching portion 192. [ The refrigerant flowing into the first circulation portion 191 flows to the first outdoor heat exchanger 131. The refrigerant flowing to the first outdoor heat exchanger (131) removes frost and is heat-exchanged with outdoor air to be condensed. The refrigerant flowing into the second circulation portion 192 flows to the second outdoor heat exchanger 132. The refrigerant that has flowed into the second outdoor heat exchanger (132) removes the frost and is heat-exchanged with outdoor air to be condensed. The refrigerant condensed in the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 flows to the indoor expansion valve 140 after being passed through the outdoor expansion valve 150 and expanded.

The refrigerant expanded in the indoor expansion valve (140) flows to the indoor heat exchanger (120). The refrigerant flowing into the indoor heat exchanger 120 is heat-exchanged with the indoor air and evaporated. The refrigerant evaporated in the indoor heat exchanger 120 flows into the first switching portion 191 and flows to the gas-liquid separator 115 through the first switching portion 191. The gaseous refrigerant separated by the gas-liquid separator 115 flows into the compressor 110 through the suction end 111 and is compressed.

The control unit 10 performs the lower defrosting operation when the set time has elapsed or the temperature of the first outdoor heat exchanger 131 is higher than the set temperature (S230). As described above, the second outdoor heat exchanger 132 is disposed below the first outdoor heat exchanger 131 and is disposed upstream of the first outdoor heat exchanger 131 with respect to the air flow direction. Therefore, And is concentrated in the outdoor heat exchanger 132. Therefore, the defrosting of the first outdoor heat exchanger 131 is achieved in a comparatively short time, and the defrosting of the second outdoor heat exchanger 132 takes a long time. Therefore, it is necessary to provide the indoor heat only when the second outdoor heat exchanger 132 is in operation.

The control unit 10 controls the first switching unit 191 to control the discharge end of the compressor 110 when the execution time of the entire defrosting operation has elapsed or the temperature of the first outdoor heat exchanger 131 is higher than the set temperature 112 are connected to the indoor heat exchanger 120 and the first outdoor heat exchanger 131 is connected to the suction end 111 of the compressor 110. Further, the control unit 10 fully opens the indoor expansion valve 140 and regulates the opening degree of the outdoor expansion valve 150. The control unit 10 maintains the state at the time of the total defrosting operation without switching the second switching portion 192. [ That is, when the entire defrosting operation is changed to the lower defrosting operation, the control unit 10 switches only the first switching unit 191, and does not switch the second switching unit 192.

Referring to FIG. 4, the refrigerant flow in the lower defrosting operation of the air conditioner according to the embodiment of the present invention will be described.

The refrigerant compressed by the compressor 110 and discharged to the discharge end 112 flows to the first switching portion 191 and the second switching portion 192. [ The refrigerant flowing into the first circulation portion 191 flows to the indoor heat exchanger 120. The refrigerant flowing into the indoor heat exchanger 120 is heat-exchanged with indoor air and condensed. The refrigerant condensed in the indoor heat exchanger 120 flows to the outdoor expansion valve 150 after being passed through the indoor expansion valve 140 and expanded.

The refrigerant flowing into the second circulation portion 192 flows to the second outdoor heat exchanger 132. The refrigerant that has flowed into the second outdoor heat exchanger (132) removes the frost and is heat-exchanged with outdoor air to be condensed. The refrigerant condensed in the second outdoor heat exchanger (132) merges with the refrigerant expanded in the outdoor expansion valve (150) and flows into the first outdoor heat exchanger (131).

The refrigerant flowing into the first outdoor heat exchanger (131) is evaporated by heat exchange with the outdoor air. The refrigerant evaporated in the first outdoor heat exchanger 131 flows into the first switching portion 191 and flows to the gas-liquid separator 115 through the first switching portion 191. The gaseous refrigerant separated by the gas-liquid separator 115 flows into the compressor 110 through the suction end 111 and is compressed.

As described above, the refrigerant compressed by the compressor 110 during the lower defrosting operation and flowed to the first switching portion 191 heats the room, and the refrigerant which flows into the second switching portion 192 flows into the second outdoor heat exchanger 132 ).

The control unit 10 performs the heating operation when the set time elapses or when the temperature of the second outdoor heat exchanger 132 is higher than the set temperature (S240). The control unit 10 controls the second switching unit 192 to control the second outdoor heat exchanger 132 when the execution time of the lower defrosting operation has elapsed or the temperature of the second outdoor heat exchanger 132 is higher than the set temperature, To the suction end (111) of the compressor (110). The control unit 10 maintains the state of the lower defrosting operation without switching the first switching unit 191. [ That is, when changing from the lower defrost operation to the heating operation, the controller 10 switches only the second switching portion 192 without switching the first switching portion 191. The refrigerant flow during the heating operation is as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

110: compressor 115: gas-liquid separator
120: indoor heat exchanger 131: first outdoor heat exchanger
132: second outdoor heat exchanger 140: indoor expansion valve
150: outdoor expansion valve 180: outdoor fan
191: Section 1 Transition 192: Section 2 Transition

Claims (8)

A compressor for compressing the refrigerant;
An indoor heat exchanger installed in a room to exchange heat between indoor air and refrigerant;
A first outdoor heat exchanger installed outside the outdoor unit for exchanging heat between the outdoor air and the refrigerant;
A second outdoor heat exchanger installed outside the outdoor unit for exchanging heat between the outdoor air and the refrigerant;
A first blowing unit connected to a discharge end of the compressor, a suction end of the indoor heat exchanger, the first outdoor heat exchanger, and the compressor; And
And a second switching part connected to the discharge end of the compressor, the second outdoor heat exchanger and the suction end of the compressor,
Wherein the first switching unit connects the discharge end of the compressor to the indoor heat exchanger during the heating operation and the lower defrost operation and connects the first outdoor heat exchanger to the suction end of the compressor, Connecting the discharge end to the first outdoor heat exchanger and connecting the indoor heat exchanger to the suction end of the compressor,
Wherein the second switching unit connects the second outdoor heat exchanger to the suction end of the compressor during the heating operation and connects the discharge end of the compressor to the second outdoor heat exchanger during the total defrost operation and the lower defrost operation Air conditioner. The method according to claim 1,
Wherein the first switching unit guides the refrigerant evaporated in the first outdoor heat exchanger to the compressor during the heating operation and the lower defrost operation and guides the refrigerant compressed in the compressor to the indoor heat exchanger. The method according to claim 1,
Wherein the first switching unit guides the refrigerant evaporated in the indoor heat exchanger to the compressor during the entire defrost operation and guides the refrigerant compressed in the compressor to the first outdoor heat exchanger. The method according to claim 1,
And the second switching unit guides the refrigerant evaporated in the second outdoor heat exchanger to the compressor during the heating operation. The method according to claim 1,
And the refrigerant condensed in the second outdoor heat exchanger flows into the first outdoor heat exchanger during the lower defrost operation. The method according to claim 1,
Further comprising a control unit for controlling the first switching unit and the second switching unit,
Wherein,
When the defrosting condition is satisfied during the heating operation, the first switching portion and the second switching portion are switched to guide the refrigerant compressed in the compressor to the first outdoor heat exchanger and the refrigerant compressed in the compressor to the second outdoor heat exchanger After performing the entire defrosting operation guiding,
And performs the lower defrosting operation in which only the first blowing-out portion is switched to guide the refrigerant compressed in the compressor to the indoor heat exchanger and guide the refrigerant compressed in the compressor to the second outdoor heat exchanger. delete delete

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