KR101899220B1 - Air Conditioner - Google Patents

Abstract

An air conditioner according to an embodiment of the present invention includes: a compressor for compressing a refrigerant; A flow path switching device connected to the suction flow path and the discharge flow path of the compressor, respectively; An indoor heat exchanger connected to the flow switching device; A first outdoor heat exchanger connected to the indoor heat exchanger through a first flow path; A second outdoor heat exchanger connected to the first outdoor heat exchanger and the second flow path, the second outdoor heat exchanger connected to the flow path switching device through a third flow path; A first opening / closing valve provided in a first connection passage connecting the first flow path and the second flow path; A second on-off valve installed in a second connection passage connecting the second flow path and the third flow path; And a third open / close valve installed in the second flow path. The third opening / closing valve may be installed between a first connection portion to which the second flow path and the first connection flow path are connected and a second connection portion to which the second flow path and the second connection flow path are connected. The first outdoor heat exchanger and the second outdoor heat exchanger may be disposed in an outdoor unit having an air inlet, and the first outdoor heat exchanger may be disposed between the air inlet and the second outdoor heat exchanger.

Description

Air conditioner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner in which a plurality of outdoor heat exchangers perform defrost operation and others perform heating operation.

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 mechanism, 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 four-way valve for changing the flow path of the refrigerant compressed by the compressor according to the cooling operation and the heating operation when the air conditioner is composed of the air conditioner and the air conditioner. That is, the refrigerant compressed in the compressor during the cooling operation flows through the four-way valve 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 mechanism, and then flows into the indoor heat exchanger. At this time, the indoor heat exchanger acts as an evaporator, and the refrigerant evaporated in the indoor heat exchanger passes through the four-way valve and flows into the compressor.

On the other hand, the refrigerant compressed in the compressor during the heating operation flows through the four-way valve 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 mechanism, 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 four-way valve and flows into the compressor.

In winter, water is generated on the surface of the outdoor heat exchanger serving as an evaporator during the heating operation of the air conditioner. In this case, the condensation water generated on the surface of the outdoor heat exchanger is frosted, which impedes smooth flow of the outdoor air and heat exchange, thereby deteriorating the heating performance.

Therefore, when the heating operation is stopped during the heating operation and the refrigeration cycle is operated in the reverse cycle (i.e., cooling operation) in order to remove the congested condensed water, the refrigerant of high temperature and high pressure passes through the outdoor heat exchanger, Is melted by the heat of the refrigerant. However, when the defrosting operation is performed in the reverse cycle as described above, there has been a problem that the heating of the room must be stopped.

In order to solve this problem, conventionally, the outdoor heat exchanger is divided into an upper portion and a lower portion, the compressed high-temperature refrigerant is sent to the upper heat exchanger, the upper portion is defrosted first and then the lower heat exchanger is uniformly defrosted to simultaneously defrost and heat. However, when the above-described outdoor heat exchanger is divided into a top / bottom partitioning system, the water melted in the upper portion falls into the lower heat exchanger and freezes again on the surface of the lower cooling heat exchanger. In addition, if cumulative freezing occurs, even if the defrosting operation is performed, it is not completely melted. As the operation time elapses, there is a problem that the freezing capacity increases and the heating capacity decreases.

KR 10-2010-0088378 A (Released on August 9, 2010)

An object of the present invention is to provide an air conditioner capable of continuous heating even during a trouble.

Another problem to be solved by the present invention is to provide an air conditioner that prevents accumulation of ice during division.

An air conditioner according to an embodiment of the present invention includes: a compressor for compressing a refrigerant; A flow path switching device connected to the suction flow path and the discharge flow path of the compressor, respectively; An indoor heat exchanger connected to the flow path switching device; A first outdoor heat exchanger connected to the indoor heat exchanger through a first flow path; A second outdoor heat exchanger connected to the first outdoor heat exchanger through a second flow path and connected to the flow path switching device through a third flow path; A first opening / closing valve provided in a first connection passage connecting the first flow path and the second flow path; A second on-off valve installed in a second connection passage connecting the second flow path and the third flow path; And a third open / close valve installed in the second flow path. The third on-off valve may be provided between a first connection portion to which the second flow path and the first connection flow path are connected and a second connection portion to which the second flow path and the second connection flow path are connected. The first outdoor heat exchanger and the second outdoor heat exchanger may be disposed in an outdoor unit having an air inlet, and the first outdoor heat exchanger may be disposed between the air inlet and the second outdoor heat exchanger.

In this case, the first outdoor heat exchanger and the second outdoor heat exchanger are separated from each other, one of which performs the defrosting operation and the other of which performs the heating operation, so that the continuous heating can be performed. In addition, the water dropped from the surface of the first outdoor heat exchanger does not fall into the second outdoor heat exchanger, and cumulative freezing can be prevented.

The first outdoor heat exchanger and the second outdoor heat exchanger may be arranged in parallel to each other.

In the split defrost mode, the first outdoor heat exchanger performs defrosting, and the second outdoor heat exchanger operates as an evaporator.

According to this, the first outdoor heat exchanger having a large congestion amount can be defrosted to prevent deterioration and defrosting effect, and the second outdoor heat exchanger can be prevented from being frosted due to the air heated by the first outdoor heat exchanger, and the evaporation performance can be improved .

An air conditioner according to an embodiment of the present invention includes: a first outdoor expansion mechanism installed in the first flow path; And a second outdoor expansion mechanism installed in the second flow path.

Wherein the first outdoor expansion mechanism is disposed between a third connection portion and the first outdoor heat exchanger to which the first flow path and the first connection passage are connected and the second outdoor expansion mechanism includes the first connection portion and the second outdoor portion Can be disposed between the heat exchangers.

The air conditioner according to an embodiment of the present invention may further include an indoor expansion mechanism installed in the first flow path.

The indoor expansion mechanism may be disposed between the indoor heat exchanger and the third connection portion.

The air conditioner according to an embodiment of the present invention may further include a controller for controlling the flow path switching device so that the discharge flow path and the indoor heat exchanger communicate with each other and the suction flow path and the third flow path communicate with each other in a heating mode.

The control unit may open the first on-off valve and the second on-off valve and close the third on-off valve in the normal heating mode.

The control unit may close the first on-off valve and the second on-off valve and open the third on-off valve in the split defrost mode.

An air conditioner according to an embodiment of the present invention includes: a first outdoor expansion mechanism installed in the first flow path; And a second outdoor expansion mechanism installed in the second flow path.

The control unit may be capable of fully opening the first outdoor expansion mechanism and controlling the second outdoor expansion mechanism at a set opening degree in the divided defrosting mode.

The air conditioner according to an embodiment of the present invention may further include a controller for controlling the flow path switching device so that the suction flow path and the indoor heat exchanger communicate with each other and the third flow path and the discharge flow path communicate with each other in a cooling mode.

The control unit may close the first on-off valve and the second on-off valve and open the third on-off valve in the normal cooling mode.

The control unit may open the first on-off valve and the second on-off valve and close the third on-off valve in the pre-defrosting mode.

An air conditioner according to an embodiment of the present invention includes: a first outdoor expansion mechanism installed in the first flow path; And a second outdoor expansion mechanism installed in the second flow path.

The control unit may be capable of fully opening the first outdoor expansion mechanism and the second outdoor expansion mechanism in the pre-defrosting mode.

An air conditioner according to an embodiment of the present invention includes an air temperature sensor for measuring a temperature of outside air; A first temperature sensor disposed in the first outdoor heat exchanger; A second temperature sensor disposed in the second outdoor heat exchanger; And a controller receiving the measured temperatures of the air temperature sensor, the first temperature sensor, and the second temperature sensor.

If the difference between the measured temperature of the air temperature sensor and the measured temperature of the first temperature sensor is larger than a preset defrosting rushing temperature, the control unit may enter the split defrosting mode.

When the measured temperature of the first temperature sensor is higher than a predetermined defrost releasing temperature, the control unit can release the divided defrost mode.

If the difference between the measured temperature of the air temperature sensor and the measured temperature of the second temperature sensor is greater than a preset defrosting rushing temperature, the controller may enter the defrosting mode.

When the measured temperature of the second temperature sensor is higher than a predetermined defrost releasing temperature, the controller can release the defrosting mode.

According to a preferred embodiment of the present invention, there is an advantage that the first outdoor heat exchanger and the second outdoor heat exchanger are separated from each other so that one can perform the defrosting operation and the other can perform the heating operation to achieve continuous heating.

In addition, the water dropped from the surface of the first outdoor heat exchanger does not fall into the second outdoor heat exchanger, and cumulative freezing can be prevented.

In addition, the first outdoor heat exchanger having a large amount of impregnation can be defrosted to prevent irrigation and to obtain a defrosting effect.

Further, the air heated by the first outdoor heat exchanger can prevent the second outdoor heat exchanger from being frosted, and the evaporation performance can be improved.

1 is a schematic view of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a view illustrating a flow of a refrigerant in a general heating mode of an air conditioner according to an embodiment of the present invention. Referring to FIG.
3 is a block diagram illustrating the flow of refrigerant in the split defrost mode of the air conditioner according to the embodiment of the present invention.
FIG. 4 is a view illustrating a flow of a refrigerant in a full-defrost mode of an air conditioner according to an embodiment of the present invention.
FIG. 5 is a configuration diagram illustrating a flow of a refrigerant in a normal cooling mode of an air conditioner according to an embodiment of the present invention.
6 is a control block diagram of an air conditioner according to an embodiment of the present invention.
FIG. 7 is a flowchart illustrating an example of a divided defroster operation method of an air conditioner according to an embodiment of the present invention.
FIG. 8 is a flowchart illustrating an example of a method for operating a full-defroster in an air conditioner according to an embodiment of the present invention.
FIG. 9 is a flowchart showing another example of the split defrosting and defrosting operation method of the air conditioner according to the embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic view of an air conditioner according to an embodiment of the present invention.

Referring to FIG. 1, the air conditioner 1 according to the present embodiment may include an outdoor unit O and an indoor unit I.

The types of the outdoor unit (O) and the indoor unit (I) are not limited. For example, the indoor unit I may be of a ceiling shape as shown in Fig. In addition, the indoor unit I may be a stand-alone type installed on the floor or a wall-mounted type hanging on the wall.

The outdoor unit (O) can be disposed outdoors, and the indoor unit (I) can be disposed indoors.

The indoor unit I can perform indoor cooling or heating and the outdoor unit O can perform heat exchange with the outdoor air to satisfy the cooling / heating load due to the cooling or heating of the indoor unit I.

An air inlet 4 may be provided on the front surface 2 of the outdoor unit O and an air outlet may be provided on the rear surface 3. [

The first outdoor heat exchanger (40) and the second outdoor heat exchanger (50), which will be described later, may be disposed in the outdoor unit (O). The first outdoor heat exchanger (40) may be disposed in front of the second outdoor heat exchanger (50). The first outdoor heat exchanger 40 may be disposed between the air inlet 4 and the second outdoor heat exchanger 50 and the second outdoor heat exchanger 50 may be disposed between the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50. [ And can be disposed between the air outlets. Thus, the air sucked into the air intake port (4) is heat-exchanged in turn in the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50), and can be discharged to the air discharge port. We will explain more later.

The refrigerant can reciprocate between the outdoor unit (O) and the indoor unit (I). For this purpose, the outdoor unit (O) and the indoor unit (I) may be connected by a first flow path (71) and a fourth flow path (74). The directions of the refrigerant flowing into the first flow path 71 and the fourth flow path 74 may be opposite to each other.

Hereinafter, the detailed configuration of the air conditioner 1 according to the present embodiment will be described.

FIG. 2 is a view illustrating a flow of a refrigerant in a general heating mode of an air conditioner according to an embodiment of the present invention. Referring to FIG.

2, the air conditioner 1 according to the present embodiment may include a compressor 10, a flow path switching device 20, an indoor heat exchanger 30, and outdoor heat exchangers 40 and 50 . The air conditioner 1 may further include an outdoor expansion mechanism (41, 51) and an indoor expansion mechanism (31).

The compressor 10, the flow path switching device 20, the outdoor heat exchangers 40 and 50 and the outdoor expansion devices 41 and 51 may be disposed in the outdoor unit O. The indoor heat exchanger (30) and the indoor expansion mechanism (31) can be disposed in the indoor unit (I).

The compressor 10 can be connected to the flow path switching device 20 through the suction flow path 12 and the discharge flow path 11. [ The flow path switching device 20 may be connected to the indoor heat exchanger 30 through a fourth flow path 74. The indoor heat exchanger (30) may be connected to the first outdoor heat exchanger (40) through a first flow path (71). The first outdoor heat exchanger (40) may be connected to the second outdoor heat exchanger (50) through a second flow path (72). The second outdoor heat exchanger (50) may be connected to the flow path switching device (20) by a third flow path (73).

The first connection passage 75 may connect the first passage 71 and the second passage 72. The second connection flow path 76 may connect the second flow path 72 and the third flow path 73.

The compressor (10) can compress the refrigerant. The compressor (10) is preferably an inverter compressor whose drive frequency can be adjusted.

The compressor (10) may be connected to the discharge passage (11) and the suction passage (12). The compressor 10 compresses the refrigerant sucked through the suction flow path 12 and can discharge the refrigerant into the discharge flow path 11. The refrigerant compressed in the compressor 10 and discharged into the discharge passage 11 may be a gas refrigerant of high temperature and high pressure.

The suction passage 12 may be provided with an accumulator (not shown). The accumulator can separate the liquid refrigerant and the gaseous refrigerant so that only the gaseous refrigerant is sucked into the compressor (10).

The flow path switching device 20 may be a four-way valve.

The flow path switching device 20 may be connected to the suction flow path 11 and the discharge flow path 12, respectively. A third flow path 73 connected to the second outdoor heat exchanger 50 and a fourth flow path 74 connected to the indoor heat exchanger 30 may be connected to the flow path switching device 20.

The flow path switching device 20 can communicate the discharge path 12 and the fourth path 74 in a heating mode and the suction path 12 and the third path 73 in a heating mode. Thus, the refrigerant compressed in the compressor 10 can flow into the indoor heat exchanger 30, and the refrigerant evaporated in the second outdoor heat exchanger 50 can be sucked into the compressor 10.

The flow path switching device 20 can communicate the discharge flow path 12 and the third flow path 73 in the cooling mode and the suction flow path 12 and the fourth flow path 74 can communicate with each other. Thus, the refrigerant compressed in the compressor 10 can be flowed to the second outdoor heat exchanger 50, and the refrigerant evaporated in the indoor heat exchanger 30 can be sucked into the compressor 10. This will be described in detail later. This will be described in detail later.

The outdoor heat exchangers (40, 50) can exchange heat between the refrigerant and the outside air.

The outdoor heat exchangers (40, 50) may include a first outdoor heat exchanger (40) and a second outdoor heat exchanger (50).

The first outdoor heat exchanger (40) may be connected to the indoor heat exchanger (30) through a first flow path (71). That is, the first flow path 71 may be extended from the indoor unit I to the outdoor unit O.

The first outdoor heat exchanger 40 may be connected to the second outdoor heat exchanger 50 through the second flow path 72 and the second outdoor heat exchanger 50 may be connected to the third flow path 73 through the flow path switching device 50. [ Lt; / RTI > That is, the second flow path 72 and the third flow path 73 may be the flow paths located inside the out-room unit (O).

More specifically, one side of the first outdoor heat exchanger (40) may be connected to the indoor heat exchanger (30) by a first flow path (71). The other side of the first outdoor heat exchanger (40) can be connected to one side of the second outdoor heat exchanger (50) by the second flow path (72). The other side of the second outdoor heat exchanger (50) can be connected to the flow path switching device (20) by the third flow path (73).

The first outdoor heat exchanger (40) may be disposed in front of the second outdoor heat exchanger (50). More specifically, the first outdoor heat exchanger 40 may be positioned before the second outdoor heat exchanger 50 in accordance with the flow direction of the outside air blown by the outdoor blower orifice 44. That is, the outside air blown by the outdoor blower orifice 44 can pass through the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50 in order.

The first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) can be arranged side by side. For example, the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) may be arranged long in a direction perpendicular to the flow direction of the outside air.

The second outdoor heat exchanger (50) may be smaller than the first outdoor heat exchanger (40). As a result, the front surface of the second outdoor heat exchanger (50) can be covered by the first outdoor heat exchanger (40), so that outside air passing through the first outdoor heat exchanger (40) reaches the second outdoor heat exchanger .

The first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) may be separate heat exchangers arranged separately from each other. Alternatively, the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) may refer to respective parts where a single outdoor heat exchanger is divided forward and backward.

The outdoor blower orifice (44) may be disposed in front of the first outdoor heat exchanger (40). The outdoor blower orifice (44) may be arranged to face the first outdoor heat exchanger (40).

 Or the outdoor blower orifice 44 may be disposed behind the second outdoor heat exchanger 50. The outdoor blower orifice 44 may be disposed between the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50.

The outdoor blower orifice (44) can suck the outside air into the air inlet (4) of the outdoor unit (O). The air sucked into the air intake port 4 is successively heat-exchanged in the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50 and then discharged to an air discharge port (not shown) formed in the outdoor unit O .

The outdoor expansion mechanisms (41, 51) may be an electric expansion valve (EEV) whose opening is controlled. For example, when the outdoor expansion mechanisms 41 and 51 are adjusted to the set opening degrees, the refrigerant passing through the outdoor expansion mechanisms 41 and 51 can be expanded. On the other hand, when the outdoor expansion mechanisms (41, 51) are fully opened, the refrigerant passing through the outdoor expansion mechanisms (41, 51) can be passed without being inflated.

The outdoor expansion mechanisms 41 and 51 include a first outdoor expansion mechanism 41 connected to the first outdoor heat exchanger 40 and a second outdoor expansion mechanism 51 connected to the second outdoor heat exchanger 50 .

The first outdoor expansion mechanism (41) may be installed in the first flow path (71). More specifically, the first outdoor expansion mechanism (41) may be installed close to the first outdoor heat exchanger (40) and the first outdoor heat exchanger (40) of the indoor heat exchanger (30). More specifically, the first outdoor expansion mechanism (41) may be disposed between the first outdoor heat exchanger (40) and a third connection portion (66), which will be described later.

The second outdoor expansion mechanism (51) may be installed in the second flow path (72). More specifically, the second outdoor expansion mechanism (51) may be installed close to the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) of the second outdoor heat exchanger (50). More specifically, the second outdoor expansion mechanism 51 can be disposed between the second outdoor heat exchanger 50 and the first connection portion 64, which will be described later.

The indoor heat exchanger (30) is capable of exchanging heat between the refrigerant and the room air.

The indoor heat exchanger 30 may be connected to the flow path switching device 20 through a fourth flow path 74 and may be connected to the first outdoor heat exchanger 40 through a first flow path 71. More specifically, one side of the indoor heat exchanger 30 can be connected to the flow path switching device 20 by the fourth flow path 74, and the other side can be connected to the first outdoor heat exchanger 40 through the first flow path 71, Lt; / RTI >

The indoor blower orifices 32 may be arranged to face the indoor heat exchanger 30. [ The indoor air flowed by the indoor blower orifice 32 is heat-exchanged in the indoor heat exchanger 30 to perform heating or cooling of the indoor space.

The indoor expansion mechanism 31 may be an electric expansion valve (EEV) whose opening degree is controlled. For example, when the indoor expansion mechanism (31) is adjusted to the set opening degree, the refrigerant passing through the indoor expansion mechanism (31) can be expanded. On the other hand, when the indoor expansion mechanism (31) is fully opened, the refrigerant passing through the indoor expansion mechanism (31) can be passed without being expanded.

The indoor expansion mechanism (31) can be installed in the first flow path (71). More specifically, the indoor expansion mechanism 31 may be installed closer to the indoor heat exchanger 30 of the first outdoor heat exchanger 40 and the indoor heat exchanger 30 . More specifically, the indoor expansion mechanism 31 can be disposed between the indoor heat exchanger 30 and a third connecting portion 66, which will be described later.

The first connection passage 75 may connect the second flow path 72 and the first flow path 71 and the second connection flow path 76 may connect the second flow path 72 and the third flow path 73 You can connect. More specifically, the first connection passage 75 can connect the first connection portion 64 of the second flow path 72 and the third connection portion 66 of the first flow path 71, and the second connection flow path 76 May connect the second connection portion 65 of the second flow path 72 and the fourth connection portion 67 of the third flow path 73. [

That is, the first connection portion 64 may refer to a portion where the second flow path 72 and the first connection path 75 are connected. The second connection portion 65 may refer to a portion where the second flow path 72 and the second connection flow path 76 are connected. The third connection portion 66 may refer to a portion where the first flow path 71 and the first connection path 75 are connected. The fourth connection portion 67 may refer to a portion where the second connection flow passage 76 and the third flow passage 73 are connected.

The first connection portion 64 may be located near the second outdoor heat exchanger 50 among the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50 in the second flow path 72. A second outdoor expansion mechanism (51) may be disposed between the first connection portion (64) and the second outdoor heat exchanger (50).

The second connection portion 65 may be located near the first outdoor heat exchanger 40 among the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50 in the second flow path 72.

The third connection portion 66 may be located near the first outdoor heat exchanger 40 of the first outdoor heat exchanger 40 and the first outdoor heat exchanger 40 of the indoor heat exchanger 30 in the first flow path 71. A first outdoor expansion mechanism (41) may be disposed between the third connection portion (66) and the first outdoor heat exchanger (40).

The fourth connection portion 67 may be located in the vicinity of the second outdoor heat exchanger 50 of the third flow path 73 and the second outdoor heat exchanger 50 of the flow path switching device 20.

A first opening and closing valve 61 may be provided in the first connection passage 75 and a second opening and closing valve 62 may be provided in the second connection passage 76. [ As each of the on-off valves 61 and 62 is opened or closed, the connection flow paths 75 and 76 can be opened or closed.

A third opening / closing valve (63) may be installed in the second flow path (72). More specifically, the third opening / closing valve 63 may be installed between the first connecting portion 64 and the second connecting portion 65 of the second flow path 72.

The first on-off valve 61 and the second on-off valve 62 can operate in the same manner and the third on-off valve 63 can operate in the opposite manner. For example, the first on-off valve 61 and the second on-off valve 62 may be opened and the third on-off valve 63 may be closed. On the contrary, the first on-off valve 61 and the second on-off valve 62 are closed and the third on-off valve 63 can be opened.

The air conditioner 1 according to the present embodiment may include an air temperature sensor 43, a first temperature sensor 42, and a second temperature sensor 52. It goes without saying that the air conditioner 1 may further include an additional temperature sensor if necessary.

The air temperature sensor 43 can measure the ambient temperature.

The air temperature sensor 43 may be disposed outside or inside the outdoor unit (O). The air temperature sensor 43 may be disposed between the air intake port 4 of the outdoor unit O and the first outdoor heat exchanger 40.

The first temperature sensor 42 can measure the temperature of the first outdoor heat exchanger 40.

The first temperature sensor (42) may be disposed in the first outdoor heat exchanger (40). In more detail, the first temperature sensor 42 may be located at one side of the first outdoor heat exchanger 40 that is close to the first outdoor expansion mechanism 41. Alternatively, the first temperature sensor 42 may be disposed between the first outdoor heat exchanger 40 and the first outdoor expansion mechanism 41.

The second temperature sensor 42 can measure the temperature of the second outdoor heat exchanger 40.

The second temperature sensor 52 may be disposed in the second outdoor heat exchanger 50. In more detail, the second temperature sensor 52 may be located at one side of the second outdoor heat exchanger 50 close to the second outdoor expansion mechanism 51. Alternatively, the second temperature sensor 52 may be disposed between the second outdoor heat exchanger (50) and the second outdoor expansion mechanism (51).

Since the outside air blown by the outdoor blower opening 44 preferentially passes through the first outdoor heat exchanger 40 rather than the second outdoor heat exchanger 50, the amount of impregnation of the first outdoor heat exchanger 40 is larger than that of the second outdoor heat exchanger 40 May be greater than the implantation amount of the device (50). Generally, the measured temperature T1 of the first temperature sensor 42 may be lower than the measured temperature T2 of the second temperature sensor 52, because the temperature is lowered when congealing occurs in the heat exchanger.

Hereinafter, the operation of the air conditioner 1 according to the present embodiment will be described.

The air conditioner 1 can be operated in a heating mode or a cooling mode. The heating mode may include a general heating mode and a split defrost mode. The cooling mode may include a full defrost mode and a general cooling mode.

Hereinafter, the operation of the air conditioner 1 in the general heating mode will be described.

2, in the normal heating mode, the flow path switching device 20 can communicate the discharge flow path 11 and the fourth flow path 74 with each other. That is, the discharge passage 11 and the indoor heat exchanger 30 can communicate with each other.

Therefore, the refrigerant compressed in the compressor 10 and discharged to the discharge passage 11 can be flowed to the indoor heat exchanger 30 through the fourth flow path 74.

The indoor heat exchanger 30 may serve as a condenser. More specifically, the refrigerant flowing into the indoor heat exchanger (30) can be condensed by heat exchange with the air blown by the indoor blower (32), and the air can be heated by heat exchange and blown into the room. In this way, indoor heating can be achieved.

The refrigerant condensed in the indoor heat exchanger (30) can flow along the first flow path (71). At this time, the indoor expansion mechanism 31 can be fully opened. Therefore, the refrigerant condensed in the indoor heat exchanger (30) can pass through the indoor expansion mechanism (31) without being inflated.

In the normal heating mode, the first on-off valve 61 is opened and the third on-off valve 63 is closed.

A part of the refrigerant flowing into the first flow path 71 can flow into the first outdoor expansion mechanism 41 and the remaining part flows through the first connection flow path 75 into the second Can be flowed to the outdoor expansion mechanism (51). At this time, since the third on-off valve (63) is closed, the refrigerant does not flow toward the second connection portion (65) along the second flow path (72).

In the general heating mode, the first outdoor expansion mechanism (41) and the second outdoor expansion mechanism (51) can be adjusted to a set opening degree. Therefore, the refrigerant passing through each of the outdoor expansion mechanisms (41, 51) can be expanded.

The refrigerant expanded in the first outdoor expansion mechanism 41 can flow into the first outdoor heat exchanger 40 and the refrigerant expanded in the second outdoor expansion mechanism 51 can flow into the second outdoor heat exchanger 50 .

Each of the outdoor heat exchangers (40, 50) can perform the function of an evaporator. More specifically, the refrigerant flowing into each of the outdoor heat exchangers (40, 50) can be evaporated by heat exchange with the outside air blown by the outdoor air blower opening (44).

In the normal heating mode, the second on-off valve 62 can be opened.

Therefore, the refrigerant evaporated in the first outdoor heat exchanger (40) can flow to the third flow path (73) through the second connection flow path (76). At this time, since the third on-off valve (63) is closed, the refrigerant does not flow toward the first connection portion (64) along the second flow path (72).

In addition, the refrigerant evaporated in the second outdoor heat exchanger (50) can flow to the third flow path (73).

The refrigerant vaporized in the first outdoor heat exchanger 40 and the refrigerant evaporated in the second outdoor heat exchanger 50 are combined at the fourth connection portion 67 and flow to the flow path switching device 20 along the third flow path 73 .

Consequently, in the general heating mode, the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) can be connected in parallel to the flow of the refrigerant. That is, the refrigerant is divided into the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50), and the refrigerant that has passed through the outdoor heat exchangers (40, 50) can be combined again.

In the normal heating mode, the flow path switching device 20 can communicate the suction flow path 12 and the third flow path 73 with each other. Therefore, the refrigerant that has flowed to the third flow path 73 can be sucked into the compressor 10 through the suction path 12, and the compressor 10 can compress and discharge the sucked refrigerant again. Thereby, the above-described process is repeated and the refrigerant can circulate.

3 is a block diagram illustrating the flow of refrigerant in the split defrost mode of the air conditioner according to the embodiment of the present invention.

Hereinafter, the operation of the air conditioner 1 in the split defrosting mode will be described with reference to Fig.

The split defrosting mode may be an uninterrupted continuous heating mode that simultaneously performs defrosting and heating. That is, the first outdoor heat exchanger (40) performs defrosting and the second outdoor heat exchanger (50) can operate as an evaporator. As a result, the heating may not be stopped while performing the defrosting.

In the split defrosting mode, the flow path switching device 20, the indoor heat exchanger 30, and the indoor expansion mechanism 31 can operate in the same manner as the ordinary heating mode. Therefore, the redundant contents are omitted and only the subsequent actions are explained.

In the split defrost mode, the first on-off valve 61 can be closed.

Therefore, the entire refrigerant flowing into the first flow path 71 can flow into the first outdoor expansion mechanism 41. At this time, since the first on-off valve 61 is closed, the refrigerant does not flow toward the second flow path 72 along the first connection path 75.

In the split defrost mode, the first outdoor expansion mechanism 41 may be fully open. Therefore, the refrigerant may not expand due to passing through the first outdoor expansion mechanism 41, and the high-temperature and high-pressure liquid refrigerant condensed in the indoor heat exchanger 30 may be flowed into the first outdoor heat exchanger 40 as it is .

Temperature liquid refrigerant flows into the first outdoor heat exchanger 40, the temperature of the first outdoor heat exchanger 40 rises and the first outdoor heat exchanger 40 can be defrosted.

Since the outside air blown by the outdoor blower opening 44 preferentially passes through the first outdoor heat exchanger 40 rather than the second outdoor heat exchanger 50, the amount of impregnation of the first outdoor heat exchanger 40 is larger than that of the second outdoor heat exchanger 40 May be greater than the implantation amount of the device (50). Therefore, defrosting the first outdoor heat exchanger (40) is more effective than defrosting the second outdoor heat exchanger (50).

Further, since the temperature of the first outdoor heat exchanger (40) is raised, the air passing through the first outdoor heat exchanger (40) can also be heated, and the heated air passes through the second outdoor heat exchanger . As a result, frost prevention and defrosting of the second outdoor heat exchanger (50) can be achieved.

In the split defrost mode, the second on-off valve 62 can be closed and the third on-off valve 63 can be opened.

Therefore, the refrigerant that has passed through the first outdoor heat exchanger (40) can flow into the second outdoor expansion device (51) along the second flow path (72). At this time, since the second on-off valve 62 is closed, the refrigerant does not flow to the third flow path 73 through the second connection flow path 76. Also, since the first on-off valve 61 is closed, the refrigerant does not flow into the first flow path 71 along the first connection path 75.

In the split defrost mode, the second outdoor expansion mechanism (51) can be adjusted to a set opening degree. Therefore, the refrigerant passing through the second outdoor expansion mechanism (51) can be expanded.

The refrigerant expanded in the second outdoor expansion mechanism (51) can flow to the second outdoor heat exchanger (50).

The second outdoor heat exchanger (50) can perform the function of an evaporator. More specifically, the refrigerant flowing into the second outdoor heat exchanger (50) can be evaporated by heat exchange with the outside air blown by the outdoor blower orifice (44).

As described above, the air heated in the first outdoor heat exchanger (40) for defrosting can pass through the second outdoor heat exchanger (50). That is, since the second outdoor heat exchanger 50 exchanges heat with the heated air, evaporation can be more actively generated. As a result, the evaporation performance of the second outdoor heat exchanger (50) can be improved.

The refrigerant evaporated in the second outdoor heat exchanger (50) can flow into the flow path switching device (20) along the third flow path (73). At this time, since the second on-off valve (62) is closed, the refrigerant does not flow into the second flow path (72) along the second connection flow path (76).

Consequently, in the split defrost mode, the first outdoor heat exchanger 40 and the second outdoor heat exchanger 50 can be connected in series to the flow of the refrigerant. That is, the refrigerant can pass through the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) in order.

As described above, in the split defrosting mode, the flow path switching device 20 operates in the same manner as in the normal defrosting mode, so that the suction flow path 12 and the third flow path 73 can communicate with each other. Therefore, the refrigerant that has flowed to the third flow path 73 can be sucked into the compressor 10 through the suction path 12, and the compressor 10 can compress and discharge the sucked refrigerant again. Thereby, the above-described process is repeated and the refrigerant can circulate.

FIG. 4 is a view illustrating a flow of a refrigerant in a full-defrost mode of an air conditioner according to an embodiment of the present invention.

Hereinafter, the operation of the air conditioner 1 in the pre-defrost mode will be described with reference to FIG.

The total defrosting mode may mean a mode for simultaneously defrosting all of the outdoor heat exchangers 40 and 50. Since the circulation direction of the refrigerant is a reverse cycle of the heating mode, it may be a cooling mode based on the indoor unit I .

In the defrost mode, the heating is stopped, but the defrost mode is faster than the split defrost mode.

In the full-defrosting mode, the flow path switching device 20 can communicate the discharge flow path 11 and the third flow path 73 with each other. Therefore, the refrigerant compressed in the compressor 10 can flow through the discharge passage 11 to the third flow passage.

In the pre-defrosting mode, the second on-off valve 62 is opened and the third on-off valve 63 is closed.

A part of the refrigerant flowing into the third flow path 73 can flow to the second outdoor heat exchanger 50 and the remaining part of the refrigerant flows through the second connection flow path 76 into the first Can be flowed to the outdoor heat exchanger (40). At this time, since the third on-off valve (63) is closed, the refrigerant does not flow toward the first connection portion (64) along the second flow path (72).

Each of the outdoor heat exchangers (40, 50) can perform the function of a condenser. More specifically, the refrigerant that has flowed into each of the outdoor heat exchangers (40, 50) can be condensed by heat exchange with the outside air blown by the outdoor blower orifice (44).

Defrosting of the outdoor heat exchangers (40, 50) can be performed because the high-temperature refrigerant passes. The high-temperature refrigerant condenses and emits condensation heat, and the defrosting of the outdoor heat exchangers (40, 50) can be achieved by the condensation heat.

The refrigerant condensed in the first outdoor heat exchanger 40 can flow to the first outdoor expansion mechanism 41 and the refrigerant condensed in the second outdoor heat exchanger 50 flows to the second outdoor expansion mechanism 51 .

In the pre-defrosting mode, the first outdoor expansion mechanism (41) and the second outdoor expansion mechanism (51) can be fully opened. Therefore, the refrigerant passing through each of the outdoor expansion mechanisms (41, 51) can pass therethrough without being inflated.

In the full defrosting mode, the first on-off valve 61 can be opened.

Therefore, the refrigerant that has passed through the second outdoor expansion mechanism (51) can flow into the first flow path (71) through the first connection flow path (75). At this time, since the third on-off valve (63) is closed, the refrigerant does not flow toward the second connection portion (65) along the second flow path (72).

In addition, the refrigerant that has passed through the first outdoor expansion mechanism (41) can flow into the first flow path (71).

The refrigerant which has passed through the outdoor expansion devices 41 and 51 can be combined in the third connection part 66 and flow to the indoor expansion mechanism 31 along the first flow path 71. [

That is, in the pre-defrost mode, the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) can be connected in parallel to the flow of the refrigerant. That is, the refrigerant is divided into the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50), and the refrigerant that has passed through the outdoor heat exchangers (40, 50) can be combined again.

On the other hand, in the pre-defrosting mode, the indoor expansion mechanism 31 can be adjusted to a set opening degree. Therefore, the refrigerant can expand through the indoor expansion mechanism (31). The expanded refrigerant may flow into the indoor heat exchanger (30).

The indoor heat exchanger 30 may serve as an evaporator. More specifically, the refrigerant flowing into the indoor heat exchanger (30) can be evaporated by heat exchange with the air blown by the indoor blower (32), and the air can be cooled by heat exchange and blown into the room. Thus, indoor cooling can be achieved.

In the full-defrosting mode, the flow path switching device 20 can communicate the suction flow path 12 and the fourth flow path 74 with each other. That is, the suction passage 12 and the indoor heat exchanger 30 can communicate with each other.

Therefore, the refrigerant evaporated in the indoor heat exchanger 30 and flowing to the fourth flow path 74 can be sucked into the compressor 10 through the suction flow path 12, and the compressor 10 compresses the sucked refrigerant again So that it can be discharged. Thereby, the above-described process is repeated and the refrigerant can circulate.

FIG. 5 is a configuration diagram illustrating a flow of a refrigerant in a normal cooling mode of an air conditioner according to an embodiment of the present invention.

Hereinafter, the operation of the air conditioner 1 in the normal cooling mode will be described with reference to FIG.

In the normal cooling mode, the flow path switching device 20 can communicate the discharge flow path 11 and the third flow path 73 with each other. Therefore, the refrigerant compressed in the compressor 10 can flow through the discharge passage 11 to the third flow passage.

In the normal cooling mode, the second on-off valve 62 can be closed.

Accordingly, all of the refrigerant that has flowed to the third flow path 73 can flow to the second outdoor heat exchanger 50. At this time, since the second on-off valve 62 is closed, the refrigerant does not flow into the second flow path 64 along the second connection flow path 76.

The second outdoor heat exchanger (50) can perform the function of the condenser. More specifically, the refrigerant flowing into the second outdoor heat exchanger (50) can be condensed by heat exchange with the outside air blown by the outdoor blower orifice (44).

The refrigerant condensed in the second outdoor heat exchanger (50) can flow into the second outdoor expansion device (51).

In the normal cooling mode, the second outdoor expansion mechanism 51 may be full-open. Therefore, the refrigerant passing through the second outdoor expansion mechanism (51) can pass through without being expanded.

In the normal cooling mode, the first on-off valve 61 is closed and the third on-off valve 63 can be opened.

Therefore, the refrigerant that has passed through the second outdoor expansion mechanism (51) can flow to the first outdoor heat exchanger (40) through the second flow path (72). At this time, since the first on-off valve 61 is closed, the refrigerant does not flow into the first flow path 71 along the first connection path 75.

The first outdoor heat exchanger (40) can perform the function of the condenser. More specifically, the refrigerant flowing into the first outdoor heat exchanger (40) can be condensed by heat exchange with the outside air blown by the outdoor blower orifice (44).

The refrigerant condensed in the first outdoor heat exchanger (40) can flow into the first outdoor expansion device (41).

In the normal cooling mode, the first outdoor expansion mechanism 41 can be fully open. Therefore, the refrigerant passing through the first outdoor expansion mechanism (41) can pass through without being expanded.

The refrigerant having passed through the first outdoor expansion mechanism (41) can flow into the indoor expansion mechanism (31) along the first flow path (71).

That is, in the normal cooling mode, the first outdoor heat exchanger (40) and the second outdoor heat exchanger (50) can be connected in series to the flow of the refrigerant. That is, the refrigerant can pass through the second outdoor heat exchanger (50) and the first outdoor heat exchanger (40) in order.

In the normal cooling mode, the flow path switching device 20, the indoor heat exchanger 30, and the indoor expansion mechanism 31 can operate in the same manner as in the all-defrost mode. Therefore, duplicate contents are omitted hereafter.

In the general cooling mode, the flow path length of the refrigerant may be increased as compared with the total defrost mode. More specifically, although the outdoor heat exchangers 40 and 50 are connected in parallel in the pre-defrost mode, they are connected in series in the normal cooling mode, so that the path becomes longer. As a result, the supercooling degree is increased and cooling efficiency is improved.

6 is a control block diagram of an air conditioner according to an embodiment of the present invention.

Referring to FIG. 6, the air conditioner 1 according to the present embodiment may include a controller 80.

The control unit 80 may be disposed in the indoor unit I and / or the outdoor unit O, but is not limited thereto.

The control unit 80 may receive the temperature information measured by the air temperature sensor 43, the first temperature sensor 42, and the second temperature sensor 52.

The control unit 80 can control the flow path switching device 20 to communicate the respective flow paths. The operation of the flow-switching device 20 in all of the above-described modes can be controlled by the control unit 80 in its entirety.

The control unit 80 can open or close the first opening / closing valve 61, the second opening / closing valve 62, and the third opening / closing valve 63, respectively. In each of the above-described modes, the operation of each on-off valve 61, 62, 63 can be controlled by the control unit 80 in its entirety.

The control unit 80 can control the opening degrees of the first outdoor expansion mechanism 42, the second outdoor expansion mechanism 52, and the indoor expansion mechanism 31, respectively. In each of the above-described modes, the operation of each of the expansion mechanisms 42, 52, and 31 can be controlled by the control unit 80 in its entirety.

FIG. 7 is a flowchart illustrating an example of a divided defroster operation method of an air conditioner according to an embodiment of the present invention.

Referring to FIG. 7, the air conditioner 1 of this embodiment can operate in a normal heating mode (S1). During the normal heating operation, the outdoor heat exchangers (40, 50) are concealed and the surface temperature can be lowered.

During operation in the normal heating mode, the controller 80 sets the difference between the outside air temperature Ta, which is the measured temperature of the air temperature sensor 43, and the measured temperature T1 of the first temperature sensor 42, Can be compared with the temperature Td1 (S3).

If the value obtained by subtracting the measured temperature (T1) of the first temperature sensor 42 from the measured temperature Ta of the air temperature sensor 43 is equal to or less than the first defrosting starting temperature Td1, the controller 80 sets the normal heating mode (S1).

On the other hand, if the value obtained by subtracting the measured temperature (T1) of the first temperature sensor 42 from the measured temperature Ta of the air temperature sensor 43 is larger than the first defrosting rushing temperature Td1, Mode (S5).

In the split defrost mode, the first outdoor heat exchanger (40) is defrosted and its temperature can rise.

During operation in the split defrost mode, the controller 80 can compare the measured temperature T1 of the first temperature sensor 42 with the predetermined first defrost release temperature Td2 (S7). The first defrosting releasing temperature Td2 may be a temperature higher than the first defrosting rushing temperature Tdl.

If the measured temperature T1 of the first temperature sensor 42 is not more than the first defrosting temperature Td2, the control unit 80 can maintain the divided defrosting mode (S5).

On the other hand, if the measured temperature T1 of the first temperature sensor 42 is higher than the first defrosting temperature Td2, the control unit 80 can release the split defrosting mode (S9). Thereafter, the controller 80 may enter the normal heating mode again (S1).

The control method according to each of the above-described steps is only an example, and one or more steps can be added, changed or deleted.

FIG. 8 is a flowchart illustrating an example of a method for operating a full-defroster in an air conditioner according to an embodiment of the present invention.

Referring to FIG. 8, the air conditioner 1 of this embodiment can operate in a general heating mode (S1). During the normal heating operation, the outdoor heat exchangers (40, 50) are concealed and the surface temperature can be lowered.

During operation in the normal heating mode, the controller 80 sets the difference between the outside temperature Ta, which is the measured temperature of the air temperature sensor 43, and the measured temperature T2, of the second temperature sensor 52, Can be compared with the temperature Td3 (S2). The second defrosting rushing start temperature Td3 may be equal to or different from the first defrosting rushing start temperature Tdl.

If the value obtained by subtracting the measured temperature Ta of the air temperature sensor 43 from the measured temperature T2 of the second temperature sensor 52 is equal to or less than the second defrosting rushing temperature Td3, (S1).

If the value obtained by subtracting the measured temperature (T2) of the second temperature sensor (52) from the measured temperature (Ta) of the air temperature sensor (43) is larger than the second defrosting rushing temperature (Td3) Mode (S4).

In the pre-defrosting mode, the outdoor heat exchangers (40, 50) are defrosted and the temperature thereof can rise.

During operation in the pre-defrost mode, the controller 80 can compare the measured temperature T2 of the second temperature sensor 52 with a predetermined second defrost release temperature Td4 (S6). The second defrost releasing temperature Td4 may be a temperature higher than the second defrosting rushing temperature Td3. Further, the second defrosting release temperature Td4 may be equal to or different from the first defrosting release temperature Td2.

If the measured temperature T2 of the second temperature sensor 52 is equal to or less than the second defrost releasing temperature Td4, the controller 80 can maintain the defrosting mode (S4).

On the other hand, if the measured temperature T2 of the second temperature sensor 52 is higher than the second defrost releasing temperature Td4, the control unit 80 can release the defrosting mode (S8). Thereafter, the controller 80 may enter the normal heating mode again (S1).

The control method according to each of the above-described steps is only an example, and one or more steps can be added, changed or deleted.

FIG. 9 is a flowchart showing another example of the split defrosting and defrosting operation method of the air conditioner according to the embodiment of the present invention.

Referring to FIG. 9, the air conditioner 1 of the present embodiment can operate in the general heating mode (S1). During the normal heating operation, the outdoor heat exchangers (40, 50) are concealed and the surface temperature can be lowered.

During operation in the normal heating mode, the controller 80 sets the difference between the outside temperature Ta, which is the measured temperature of the air temperature sensor 43, and the measured temperature T2, of the second temperature sensor 52, Can be compared with the temperature Td3 (S2).

If the value obtained by subtracting the measured temperature (Ta) of the second temperature sensor (52) from the measured temperature (Ta) of the air temperature sensor (43) is larger than the second defrosting rushing temperature (Td3), the controller (80) (S4).

During operation in the pre-defrost mode, the controller 80 can compare the measured temperature T2 of the second temperature sensor 52 with a predetermined second defrost release temperature Td4 (S6).

If the measured temperature T2 of the second temperature sensor 52 is equal to or less than the second defrost releasing temperature Td4, the controller 80 can maintain the defrosting mode (S4).

On the other hand, if the measured temperature T2 of the second temperature sensor 52 is higher than the second defrost releasing temperature Td4, the control unit 80 can release the defrosting mode (S8). Thereafter, the controller 80 may enter the normal heating mode again (S1).

On the other hand, if the value obtained by subtracting the measured temperature (T2) of the second temperature sensor 52 from the measured temperature Ta of the air temperature sensor 43 is equal to or less than the second defrosting start temperature Td3 in the above-described step S2, The control unit 80 can compare the difference between the outside air temperature Ta which is the measured temperature of the air temperature sensor 43 and the measured temperature T1 of the first temperature sensor 42 with the predetermined first defrosting start temperature Td1 (S3).

If the value obtained by subtracting the measured temperature (T1) of the first temperature sensor 42 from the measured temperature Ta of the air temperature sensor 43 is equal to or less than the first defrosting starting temperature Td1, the controller 80 sets the normal heating mode (S1).

On the other hand, if the value obtained by subtracting the measured temperature (T1) of the first temperature sensor 42 from the measured temperature Ta of the air temperature sensor 43 is larger than the first defrosting rushing temperature Td1, Mode (S5).

During operation in the split defrost mode, the controller 80 can compare the measured temperature T1 of the first temperature sensor 42 with the predetermined first defrost release temperature Td2 (S7).

If the measured temperature T1 of the first temperature sensor 42 is not more than the first defrosting temperature Td2, the control unit 80 can maintain the divided defrosting mode (S5).

On the other hand, if the measured temperature T1 of the first temperature sensor 42 is higher than the first defrosting temperature Td2, the control unit 80 can release the split defrosting mode (S9). Thereafter, the controller 80 may enter the normal heating mode again (S1).

The control method according to each of the above-described steps is only an example, and one or more steps can be added, changed or deleted.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: compressor 20: flow path switching device
30: indoor heat exchanger 31: indoor expansion mechanism
40: first outdoor heat exchanger 41: first outdoor expansion device
50: second outdoor heat exchanger 51: second outdoor expansion device
61: first opening / closing valve 62: second opening / closing valve
63: third open / close valve 80:

Claims (18)

A compressor for compressing the refrigerant;
A flow path switching device connected to the suction flow path and the discharge flow path of the compressor, respectively;
An indoor heat exchanger connected to the flow path switching device;
A first outdoor heat exchanger connected to the indoor heat exchanger through a first flow path;
A second outdoor heat exchanger connected to the first outdoor heat exchanger through a second flow path and connected to the flow path switching device through a third flow path;
A first opening / closing valve provided in a first connection passage connecting the first flow path and the second flow path;
A second on-off valve installed in a second connection passage connecting the second flow path and the third flow path; And
And a third open / close valve installed in the second flow path,
Wherein the third on-off valve is provided between a first connection portion to which the second flow path and the first connection flow path are connected and a second connection portion to which the second flow path and the second connection flow path are connected,
The first outdoor heat exchanger and the second outdoor heat exchanger are disposed in an outdoor unit having an air inlet,
And the first outdoor heat exchanger is disposed between the air inlet and the second outdoor heat exchanger. The method according to claim 1,
Wherein the first outdoor heat exchanger and the second outdoor heat exchanger are arranged in parallel to each other. 3. The method of claim 2,
In the split defrost mode, the first outdoor heat exchanger performs defrosting, and the second outdoor heat exchanger operates as an evaporator. The method according to claim 1,
A first outdoor expansion mechanism installed in the first flow path; And
And a second outdoor expansion mechanism provided in the second flow path,
Wherein the first outdoor expansion mechanism is disposed between a third connection portion to which the first flow path and the first connection passage are connected and the first outdoor heat exchanger,
And the second outdoor expansion mechanism is disposed between the first connection portion and the second outdoor heat exchanger. 5. The method of claim 4,
Further comprising an indoor expansion mechanism provided in the first flow path,
And the indoor expansion mechanism is disposed between the indoor heat exchanger and the third connection portion. The method according to claim 1,
Further comprising a control unit for controlling the flow path switching device so that the discharge flow path and the indoor heat exchanger communicate with each other and the suction flow path and the third flow path communicate with each other in a heating mode. The method according to claim 6,
Wherein,
Closing mode, the first opening / closing valve and the second opening / closing valve are opened and the third opening / closing valve is closed. The method according to claim 6,
Wherein,
Closing valve and the second on-off valve and opens the third on-off valve in the split defrost mode. 9. The method of claim 8,
A first outdoor expansion mechanism installed in the first flow path; And
And a second outdoor expansion mechanism provided in the second flow path,
Wherein,
Wherein the first outdoor expansion mechanism is fully opened and the second outdoor expansion mechanism is controlled to a set opening degree in the split defrost mode. The method according to claim 1,
Further comprising a control unit for controlling the flow path switching device so that the suction flow path and the indoor heat exchanger communicate with each other and the third flow path and the discharge flow path communicate with each other in a cooling mode. 11. The method of claim 10,
Wherein,
Closing the first on-off valve and the second on-off valve, and opening the third on-off valve in the normal air-cooling mode. 11. The method of claim 10,
Wherein,
Closing valve and the third opening / closing valve and closes the third opening / closing valve in the pre-defrosting mode. 13. The method of claim 12,
A first outdoor expansion mechanism installed in the first flow path; And
And a second outdoor expansion mechanism provided in the second flow path,
Wherein,
And the first outdoor expansion mechanism and the second outdoor expansion mechanism are opened in a full defrost mode. The method according to claim 1,
An air temperature sensor for measuring the temperature of the outside air;
A first temperature sensor disposed in the first outdoor heat exchanger;
A second temperature sensor disposed in the second outdoor heat exchanger; And
And a controller receiving the measured temperature of the air temperature sensor, the first temperature sensor, and the second temperature sensor. 15. The method of claim 14,
Wherein the controller enters the split defrost mode if the difference between the measured temperature of the air temperature sensor and the measured temperature of the first temperature sensor is greater than a preset defrosting rush temperature. 16. The method of claim 15,
And the control unit releases the split defrost mode if the measured temperature of the first temperature sensor is higher than a predetermined defrost releasing temperature. 15. The method of claim 14,
Wherein the controller enters the total defrosting mode if the difference between the measured temperature of the air temperature sensor and the measured temperature of the second temperature sensor is greater than a preset defrosting rushing temperature. 18. The method of claim 17,
And when the measured temperature of the second temperature sensor is higher than a predetermined defrost releasing temperature, the control unit releases the defrosting mode.

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